istereo: libs/libpng/pngrutil.c annotate

istereo

annotate libs/libpng/pngrutil.c @ 43:73813c1176de

better hgignore

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 14 Aug 2015 04:33:42 +0300
parents
children

rev	line source
nuclear@26	1
nuclear@26	2 /* pngrutil.c - utilities to read a PNG file
nuclear@26	3 *
nuclear@26	4 * Last changed in libpng 1.2.33 [October 31, 2008]
nuclear@26	5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@26	6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@26	7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@26	8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@26	9 *
nuclear@26	10 * This file contains routines that are only called from within
nuclear@26	11 * libpng itself during the course of reading an image.
nuclear@26	12 */
nuclear@26	13
nuclear@26	14 #define PNG_INTERNAL
nuclear@26	15 #include "png.h"
nuclear@26	16 #if defined(PNG_READ_SUPPORTED)
nuclear@26	17
nuclear@26	18 #if defined(_WIN32_WCE) && (_WIN32_WCE<0x500)
nuclear@26	19 # define WIN32_WCE_OLD
nuclear@26	20 #endif
nuclear@26	21
nuclear@26	22 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	23 # if defined(WIN32_WCE_OLD)
nuclear@26	24 /* strtod() function is not supported on WindowsCE */
nuclear@26	25 __inline double png_strtod(png_structp png_ptr, PNG_CONST char nptr, char *endptr)
nuclear@26	26 {
nuclear@26	27 double result = 0;
nuclear@26	28 int len;
nuclear@26	29 wchar_t str, end;
nuclear@26	30
nuclear@26	31 len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0);
nuclear@26	32 str = (wchar_t )png_malloc(png_ptr, len png_sizeof(wchar_t));
nuclear@26	33 if ( NULL != str )
nuclear@26	34 {
nuclear@26	35 MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len);
nuclear@26	36 result = wcstod(str, &end);
nuclear@26	37 len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL);
nuclear@26	38 endptr = (char )nptr + (png_strlen(nptr) - len + 1);
nuclear@26	39 png_free(png_ptr, str);
nuclear@26	40 }
nuclear@26	41 return result;
nuclear@26	42 }
nuclear@26	43 # else
nuclear@26	44 # define png_strtod(p,a,b) strtod(a,b)
nuclear@26	45 # endif
nuclear@26	46 #endif
nuclear@26	47
nuclear@26	48 png_uint_32 PNGAPI
nuclear@26	49 png_get_uint_31(png_structp png_ptr, png_bytep buf)
nuclear@26	50 {
nuclear@26	51 #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
nuclear@26	52 png_uint_32 i = png_get_uint_32(buf);
nuclear@26	53 #else
nuclear@26	54 /* Avoid an extra function call by inlining the result. */
nuclear@26	55 png_uint_32 i = ((png_uint_32)(*buf) << 24) +
nuclear@26	56 ((png_uint_32)(*(buf + 1)) << 16) +
nuclear@26	57 ((png_uint_32)(*(buf + 2)) << 8) +
nuclear@26	58 (png_uint_32)(*(buf + 3));
nuclear@26	59 #endif
nuclear@26	60 if (i > PNG_UINT_31_MAX)
nuclear@26	61 png_error(png_ptr, "PNG unsigned integer out of range.");
nuclear@26	62 return (i);
nuclear@26	63 }
nuclear@26	64 #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
nuclear@26	65 /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
nuclear@26	66 png_uint_32 PNGAPI
nuclear@26	67 png_get_uint_32(png_bytep buf)
nuclear@26	68 {
nuclear@26	69 png_uint_32 i = ((png_uint_32)(*buf) << 24) +
nuclear@26	70 ((png_uint_32)(*(buf + 1)) << 16) +
nuclear@26	71 ((png_uint_32)(*(buf + 2)) << 8) +
nuclear@26	72 (png_uint_32)(*(buf + 3));
nuclear@26	73
nuclear@26	74 return (i);
nuclear@26	75 }
nuclear@26	76
nuclear@26	77 /* Grab a signed 32-bit integer from a buffer in big-endian format. The
nuclear@26	78 * data is stored in the PNG file in two's complement format, and it is
nuclear@26	79 * assumed that the machine format for signed integers is the same. */
nuclear@26	80 png_int_32 PNGAPI
nuclear@26	81 png_get_int_32(png_bytep buf)
nuclear@26	82 {
nuclear@26	83 png_int_32 i = ((png_int_32)(*buf) << 24) +
nuclear@26	84 ((png_int_32)(*(buf + 1)) << 16) +
nuclear@26	85 ((png_int_32)(*(buf + 2)) << 8) +
nuclear@26	86 (png_int_32)(*(buf + 3));
nuclear@26	87
nuclear@26	88 return (i);
nuclear@26	89 }
nuclear@26	90
nuclear@26	91 /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
nuclear@26	92 png_uint_16 PNGAPI
nuclear@26	93 png_get_uint_16(png_bytep buf)
nuclear@26	94 {
nuclear@26	95 png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
nuclear@26	96 (png_uint_16)(*(buf + 1)));
nuclear@26	97
nuclear@26	98 return (i);
nuclear@26	99 }
nuclear@26	100 #endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
nuclear@26	101
nuclear@26	102 /* Read the chunk header (length + type name).
nuclear@26	103 * Put the type name into png_ptr->chunk_name, and return the length.
nuclear@26	104 */
nuclear@26	105 png_uint_32 /* PRIVATE */
nuclear@26	106 png_read_chunk_header(png_structp png_ptr)
nuclear@26	107 {
nuclear@26	108 png_byte buf[8];
nuclear@26	109 png_uint_32 length;
nuclear@26	110
nuclear@26	111 /* read the length and the chunk name */
nuclear@26	112 png_read_data(png_ptr, buf, 8);
nuclear@26	113 length = png_get_uint_31(png_ptr, buf);
nuclear@26	114
nuclear@26	115 /* put the chunk name into png_ptr->chunk_name */
nuclear@26	116 png_memcpy(png_ptr->chunk_name, buf + 4, 4);
nuclear@26	117
nuclear@26	118 png_debug2(0, "Reading %s chunk, length = %lu\n",
nuclear@26	119 png_ptr->chunk_name, length);
nuclear@26	120
nuclear@26	121 /* reset the crc and run it over the chunk name */
nuclear@26	122 png_reset_crc(png_ptr);
nuclear@26	123 png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
nuclear@26	124
nuclear@26	125 /* check to see if chunk name is valid */
nuclear@26	126 png_check_chunk_name(png_ptr, png_ptr->chunk_name);
nuclear@26	127
nuclear@26	128 return length;
nuclear@26	129 }
nuclear@26	130
nuclear@26	131 /* Read data, and (optionally) run it through the CRC. */
nuclear@26	132 void /* PRIVATE */
nuclear@26	133 png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
nuclear@26	134 {
nuclear@26	135 if (png_ptr == NULL) return;
nuclear@26	136 png_read_data(png_ptr, buf, length);
nuclear@26	137 png_calculate_crc(png_ptr, buf, length);
nuclear@26	138 }
nuclear@26	139
nuclear@26	140 /* Optionally skip data and then check the CRC. Depending on whether we
nuclear@26	141 are reading a ancillary or critical chunk, and how the program has set
nuclear@26	142 things up, we may calculate the CRC on the data and print a message.
nuclear@26	143 Returns '1' if there was a CRC error, '0' otherwise. */
nuclear@26	144 int /* PRIVATE */
nuclear@26	145 png_crc_finish(png_structp png_ptr, png_uint_32 skip)
nuclear@26	146 {
nuclear@26	147 png_size_t i;
nuclear@26	148 png_size_t istop = png_ptr->zbuf_size;
nuclear@26	149
nuclear@26	150 for (i = (png_size_t)skip; i > istop; i -= istop)
nuclear@26	151 {
nuclear@26	152 png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
nuclear@26	153 }
nuclear@26	154 if (i)
nuclear@26	155 {
nuclear@26	156 png_crc_read(png_ptr, png_ptr->zbuf, i);
nuclear@26	157 }
nuclear@26	158
nuclear@26	159 if (png_crc_error(png_ptr))
nuclear@26	160 {
nuclear@26	161 if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
nuclear@26	162 !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) \|\|
nuclear@26	163 (!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
nuclear@26	164 (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
nuclear@26	165 {
nuclear@26	166 png_chunk_warning(png_ptr, "CRC error");
nuclear@26	167 }
nuclear@26	168 else
nuclear@26	169 {
nuclear@26	170 png_chunk_error(png_ptr, "CRC error");
nuclear@26	171 }
nuclear@26	172 return (1);
nuclear@26	173 }
nuclear@26	174
nuclear@26	175 return (0);
nuclear@26	176 }
nuclear@26	177
nuclear@26	178 /* Compare the CRC stored in the PNG file with that calculated by libpng from
nuclear@26	179 the data it has read thus far. */
nuclear@26	180 int /* PRIVATE */
nuclear@26	181 png_crc_error(png_structp png_ptr)
nuclear@26	182 {
nuclear@26	183 png_byte crc_bytes[4];
nuclear@26	184 png_uint_32 crc;
nuclear@26	185 int need_crc = 1;
nuclear@26	186
nuclear@26	187 if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
nuclear@26	188 {
nuclear@26	189 if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
nuclear@26	190 (PNG_FLAG_CRC_ANCILLARY_USE \| PNG_FLAG_CRC_ANCILLARY_NOWARN))
nuclear@26	191 need_crc = 0;
nuclear@26	192 }
nuclear@26	193 else /* critical */
nuclear@26	194 {
nuclear@26	195 if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
nuclear@26	196 need_crc = 0;
nuclear@26	197 }
nuclear@26	198
nuclear@26	199 png_read_data(png_ptr, crc_bytes, 4);
nuclear@26	200
nuclear@26	201 if (need_crc)
nuclear@26	202 {
nuclear@26	203 crc = png_get_uint_32(crc_bytes);
nuclear@26	204 return ((int)(crc != png_ptr->crc));
nuclear@26	205 }
nuclear@26	206 else
nuclear@26	207 return (0);
nuclear@26	208 }
nuclear@26	209
nuclear@26	210 #if defined(PNG_READ_zTXt_SUPPORTED) \|\| defined(PNG_READ_iTXt_SUPPORTED) \|\| \
nuclear@26	211 defined(PNG_READ_iCCP_SUPPORTED)
nuclear@26	212 /*
nuclear@26	213 * Decompress trailing data in a chunk. The assumption is that chunkdata
nuclear@26	214 * points at an allocated area holding the contents of a chunk with a
nuclear@26	215 * trailing compressed part. What we get back is an allocated area
nuclear@26	216 * holding the original prefix part and an uncompressed version of the
nuclear@26	217 * trailing part (the malloc area passed in is freed).
nuclear@26	218 */
nuclear@26	219 void /* PRIVATE */
nuclear@26	220 png_decompress_chunk(png_structp png_ptr, int comp_type,
nuclear@26	221 png_size_t chunklength,
nuclear@26	222 png_size_t prefix_size, png_size_t *newlength)
nuclear@26	223 {
nuclear@26	224 static PNG_CONST char msg[] = "Error decoding compressed text";
nuclear@26	225 png_charp text;
nuclear@26	226 png_size_t text_size;
nuclear@26	227
nuclear@26	228 if (comp_type == PNG_COMPRESSION_TYPE_BASE)
nuclear@26	229 {
nuclear@26	230 int ret = Z_OK;
nuclear@26	231 png_ptr->zstream.next_in = (png_bytep)(png_ptr->chunkdata + prefix_size);
nuclear@26	232 png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
nuclear@26	233 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@26	234 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@26	235
nuclear@26	236 text_size = 0;
nuclear@26	237 text = NULL;
nuclear@26	238
nuclear@26	239 while (png_ptr->zstream.avail_in)
nuclear@26	240 {
nuclear@26	241 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@26	242 if (ret != Z_OK && ret != Z_STREAM_END)
nuclear@26	243 {
nuclear@26	244 if (png_ptr->zstream.msg != NULL)
nuclear@26	245 png_warning(png_ptr, png_ptr->zstream.msg);
nuclear@26	246 else
nuclear@26	247 png_warning(png_ptr, msg);
nuclear@26	248 inflateReset(&png_ptr->zstream);
nuclear@26	249 png_ptr->zstream.avail_in = 0;
nuclear@26	250
nuclear@26	251 if (text == NULL)
nuclear@26	252 {
nuclear@26	253 text_size = prefix_size + png_sizeof(msg) + 1;
nuclear@26	254 text = (png_charp)png_malloc_warn(png_ptr, text_size);
nuclear@26	255 if (text == NULL)
nuclear@26	256 {
nuclear@26	257 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	258 png_ptr->chunkdata = NULL;
nuclear@26	259 png_error(png_ptr, "Not enough memory to decompress chunk");
nuclear@26	260 }
nuclear@26	261 png_memcpy(text, png_ptr->chunkdata, prefix_size);
nuclear@26	262 }
nuclear@26	263
nuclear@26	264 text[text_size - 1] = 0x00;
nuclear@26	265
nuclear@26	266 /* Copy what we can of the error message into the text chunk */
nuclear@26	267 text_size = (png_size_t)(chunklength -
nuclear@26	268 (text - png_ptr->chunkdata) - 1);
nuclear@26	269 if (text_size > png_sizeof(msg))
nuclear@26	270 text_size = png_sizeof(msg);
nuclear@26	271 png_memcpy(text + prefix_size, msg, text_size);
nuclear@26	272 break;
nuclear@26	273 }
nuclear@26	274 if (!png_ptr->zstream.avail_out \|\| ret == Z_STREAM_END)
nuclear@26	275 {
nuclear@26	276 if (text == NULL)
nuclear@26	277 {
nuclear@26	278 text_size = prefix_size +
nuclear@26	279 png_ptr->zbuf_size - png_ptr->zstream.avail_out;
nuclear@26	280 text = (png_charp)png_malloc_warn(png_ptr, text_size + 1);
nuclear@26	281 if (text == NULL)
nuclear@26	282 {
nuclear@26	283 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	284 png_ptr->chunkdata = NULL;
nuclear@26	285 png_error(png_ptr,
nuclear@26	286 "Not enough memory to decompress chunk.");
nuclear@26	287 }
nuclear@26	288 png_memcpy(text + prefix_size, png_ptr->zbuf,
nuclear@26	289 text_size - prefix_size);
nuclear@26	290 png_memcpy(text, png_ptr->chunkdata, prefix_size);
nuclear@26	291 *(text + text_size) = 0x00;
nuclear@26	292 }
nuclear@26	293 else
nuclear@26	294 {
nuclear@26	295 png_charp tmp;
nuclear@26	296
nuclear@26	297 tmp = text;
nuclear@26	298 text = (png_charp)png_malloc_warn(png_ptr,
nuclear@26	299 (png_uint_32)(text_size +
nuclear@26	300 png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
nuclear@26	301 if (text == NULL)
nuclear@26	302 {
nuclear@26	303 png_free(png_ptr, tmp);
nuclear@26	304 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	305 png_ptr->chunkdata = NULL;
nuclear@26	306 png_error(png_ptr,
nuclear@26	307 "Not enough memory to decompress chunk..");
nuclear@26	308 }
nuclear@26	309 png_memcpy(text, tmp, text_size);
nuclear@26	310 png_free(png_ptr, tmp);
nuclear@26	311 png_memcpy(text + text_size, png_ptr->zbuf,
nuclear@26	312 (png_ptr->zbuf_size - png_ptr->zstream.avail_out));
nuclear@26	313 text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
nuclear@26	314 *(text + text_size) = 0x00;
nuclear@26	315 }
nuclear@26	316 if (ret == Z_STREAM_END)
nuclear@26	317 break;
nuclear@26	318 else
nuclear@26	319 {
nuclear@26	320 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@26	321 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@26	322 }
nuclear@26	323 }
nuclear@26	324 }
nuclear@26	325 if (ret != Z_STREAM_END)
nuclear@26	326 {
nuclear@26	327 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@26	328 char umsg[52];
nuclear@26	329
nuclear@26	330 if (ret == Z_BUF_ERROR)
nuclear@26	331 png_snprintf(umsg, 52,
nuclear@26	332 "Buffer error in compressed datastream in %s chunk",
nuclear@26	333 png_ptr->chunk_name);
nuclear@26	334 else if (ret == Z_DATA_ERROR)
nuclear@26	335 png_snprintf(umsg, 52,
nuclear@26	336 "Data error in compressed datastream in %s chunk",
nuclear@26	337 png_ptr->chunk_name);
nuclear@26	338 else
nuclear@26	339 png_snprintf(umsg, 52,
nuclear@26	340 "Incomplete compressed datastream in %s chunk",
nuclear@26	341 png_ptr->chunk_name);
nuclear@26	342 png_warning(png_ptr, umsg);
nuclear@26	343 #else
nuclear@26	344 png_warning(png_ptr,
nuclear@26	345 "Incomplete compressed datastream in chunk other than IDAT");
nuclear@26	346 #endif
nuclear@26	347 text_size = prefix_size;
nuclear@26	348 if (text == NULL)
nuclear@26	349 {
nuclear@26	350 text = (png_charp)png_malloc_warn(png_ptr, text_size+1);
nuclear@26	351 if (text == NULL)
nuclear@26	352 {
nuclear@26	353 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	354 png_ptr->chunkdata = NULL;
nuclear@26	355 png_error(png_ptr, "Not enough memory for text.");
nuclear@26	356 }
nuclear@26	357 png_memcpy(text, png_ptr->chunkdata, prefix_size);
nuclear@26	358 }
nuclear@26	359 *(text + text_size) = 0x00;
nuclear@26	360 }
nuclear@26	361
nuclear@26	362 inflateReset(&png_ptr->zstream);
nuclear@26	363 png_ptr->zstream.avail_in = 0;
nuclear@26	364
nuclear@26	365 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	366 png_ptr->chunkdata = text;
nuclear@26	367 *newlength=text_size;
nuclear@26	368 }
nuclear@26	369 else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
nuclear@26	370 {
nuclear@26	371 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@26	372 char umsg[50];
nuclear@26	373
nuclear@26	374 png_snprintf(umsg, 50, "Unknown zTXt compression type %d", comp_type);
nuclear@26	375 png_warning(png_ptr, umsg);
nuclear@26	376 #else
nuclear@26	377 png_warning(png_ptr, "Unknown zTXt compression type");
nuclear@26	378 #endif
nuclear@26	379
nuclear@26	380 *(png_ptr->chunkdata + prefix_size) = 0x00;
nuclear@26	381 *newlength = prefix_size;
nuclear@26	382 }
nuclear@26	383 }
nuclear@26	384 #endif
nuclear@26	385
nuclear@26	386 /* read and check the IDHR chunk */
nuclear@26	387 void /* PRIVATE */
nuclear@26	388 png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	389 {
nuclear@26	390 png_byte buf[13];
nuclear@26	391 png_uint_32 width, height;
nuclear@26	392 int bit_depth, color_type, compression_type, filter_type;
nuclear@26	393 int interlace_type;
nuclear@26	394
nuclear@26	395 png_debug(1, "in png_handle_IHDR\n");
nuclear@26	396
nuclear@26	397 if (png_ptr->mode & PNG_HAVE_IHDR)
nuclear@26	398 png_error(png_ptr, "Out of place IHDR");
nuclear@26	399
nuclear@26	400 /* check the length */
nuclear@26	401 if (length != 13)
nuclear@26	402 png_error(png_ptr, "Invalid IHDR chunk");
nuclear@26	403
nuclear@26	404 png_ptr->mode \|= PNG_HAVE_IHDR;
nuclear@26	405
nuclear@26	406 png_crc_read(png_ptr, buf, 13);
nuclear@26	407 png_crc_finish(png_ptr, 0);
nuclear@26	408
nuclear@26	409 width = png_get_uint_31(png_ptr, buf);
nuclear@26	410 height = png_get_uint_31(png_ptr, buf + 4);
nuclear@26	411 bit_depth = buf[8];
nuclear@26	412 color_type = buf[9];
nuclear@26	413 compression_type = buf[10];
nuclear@26	414 filter_type = buf[11];
nuclear@26	415 interlace_type = buf[12];
nuclear@26	416
nuclear@26	417 /* set internal variables */
nuclear@26	418 png_ptr->width = width;
nuclear@26	419 png_ptr->height = height;
nuclear@26	420 png_ptr->bit_depth = (png_byte)bit_depth;
nuclear@26	421 png_ptr->interlaced = (png_byte)interlace_type;
nuclear@26	422 png_ptr->color_type = (png_byte)color_type;
nuclear@26	423 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@26	424 png_ptr->filter_type = (png_byte)filter_type;
nuclear@26	425 #endif
nuclear@26	426 png_ptr->compression_type = (png_byte)compression_type;
nuclear@26	427
nuclear@26	428 /* find number of channels */
nuclear@26	429 switch (png_ptr->color_type)
nuclear@26	430 {
nuclear@26	431 case PNG_COLOR_TYPE_GRAY:
nuclear@26	432 case PNG_COLOR_TYPE_PALETTE:
nuclear@26	433 png_ptr->channels = 1;
nuclear@26	434 break;
nuclear@26	435 case PNG_COLOR_TYPE_RGB:
nuclear@26	436 png_ptr->channels = 3;
nuclear@26	437 break;
nuclear@26	438 case PNG_COLOR_TYPE_GRAY_ALPHA:
nuclear@26	439 png_ptr->channels = 2;
nuclear@26	440 break;
nuclear@26	441 case PNG_COLOR_TYPE_RGB_ALPHA:
nuclear@26	442 png_ptr->channels = 4;
nuclear@26	443 break;
nuclear@26	444 }
nuclear@26	445
nuclear@26	446 /* set up other useful info */
nuclear@26	447 png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
nuclear@26	448 png_ptr->channels);
nuclear@26	449 png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
nuclear@26	450 png_debug1(3, "bit_depth = %d\n", png_ptr->bit_depth);
nuclear@26	451 png_debug1(3, "channels = %d\n", png_ptr->channels);
nuclear@26	452 png_debug1(3, "rowbytes = %lu\n", png_ptr->rowbytes);
nuclear@26	453 png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
nuclear@26	454 color_type, interlace_type, compression_type, filter_type);
nuclear@26	455 }
nuclear@26	456
nuclear@26	457 /* read and check the palette */
nuclear@26	458 void /* PRIVATE */
nuclear@26	459 png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	460 {
nuclear@26	461 png_color palette[PNG_MAX_PALETTE_LENGTH];
nuclear@26	462 int num, i;
nuclear@26	463 #ifndef PNG_NO_POINTER_INDEXING
nuclear@26	464 png_colorp pal_ptr;
nuclear@26	465 #endif
nuclear@26	466
nuclear@26	467 png_debug(1, "in png_handle_PLTE\n");
nuclear@26	468
nuclear@26	469 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	470 png_error(png_ptr, "Missing IHDR before PLTE");
nuclear@26	471 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	472 {
nuclear@26	473 png_warning(png_ptr, "Invalid PLTE after IDAT");
nuclear@26	474 png_crc_finish(png_ptr, length);
nuclear@26	475 return;
nuclear@26	476 }
nuclear@26	477 else if (png_ptr->mode & PNG_HAVE_PLTE)
nuclear@26	478 png_error(png_ptr, "Duplicate PLTE chunk");
nuclear@26	479
nuclear@26	480 png_ptr->mode \|= PNG_HAVE_PLTE;
nuclear@26	481
nuclear@26	482 if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
nuclear@26	483 {
nuclear@26	484 png_warning(png_ptr,
nuclear@26	485 "Ignoring PLTE chunk in grayscale PNG");
nuclear@26	486 png_crc_finish(png_ptr, length);
nuclear@26	487 return;
nuclear@26	488 }
nuclear@26	489 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
nuclear@26	490 if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
nuclear@26	491 {
nuclear@26	492 png_crc_finish(png_ptr, length);
nuclear@26	493 return;
nuclear@26	494 }
nuclear@26	495 #endif
nuclear@26	496
nuclear@26	497 if (length > 3*PNG_MAX_PALETTE_LENGTH \|\| length % 3)
nuclear@26	498 {
nuclear@26	499 if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
nuclear@26	500 {
nuclear@26	501 png_warning(png_ptr, "Invalid palette chunk");
nuclear@26	502 png_crc_finish(png_ptr, length);
nuclear@26	503 return;
nuclear@26	504 }
nuclear@26	505 else
nuclear@26	506 {
nuclear@26	507 png_error(png_ptr, "Invalid palette chunk");
nuclear@26	508 }
nuclear@26	509 }
nuclear@26	510
nuclear@26	511 num = (int)length / 3;
nuclear@26	512
nuclear@26	513 #ifndef PNG_NO_POINTER_INDEXING
nuclear@26	514 for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
nuclear@26	515 {
nuclear@26	516 png_byte buf[3];
nuclear@26	517
nuclear@26	518 png_crc_read(png_ptr, buf, 3);
nuclear@26	519 pal_ptr->red = buf[0];
nuclear@26	520 pal_ptr->green = buf[1];
nuclear@26	521 pal_ptr->blue = buf[2];
nuclear@26	522 }
nuclear@26	523 #else
nuclear@26	524 for (i = 0; i < num; i++)
nuclear@26	525 {
nuclear@26	526 png_byte buf[3];
nuclear@26	527
nuclear@26	528 png_crc_read(png_ptr, buf, 3);
nuclear@26	529 /* don't depend upon png_color being any order */
nuclear@26	530 palette[i].red = buf[0];
nuclear@26	531 palette[i].green = buf[1];
nuclear@26	532 palette[i].blue = buf[2];
nuclear@26	533 }
nuclear@26	534 #endif
nuclear@26	535
nuclear@26	536 /* If we actually NEED the PLTE chunk (ie for a paletted image), we do
nuclear@26	537 whatever the normal CRC configuration tells us. However, if we
nuclear@26	538 have an RGB image, the PLTE can be considered ancillary, so
nuclear@26	539 we will act as though it is. */
nuclear@26	540 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
nuclear@26	541 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	542 #endif
nuclear@26	543 {
nuclear@26	544 png_crc_finish(png_ptr, 0);
nuclear@26	545 }
nuclear@26	546 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
nuclear@26	547 else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */
nuclear@26	548 {
nuclear@26	549 /* If we don't want to use the data from an ancillary chunk,
nuclear@26	550 we have two options: an error abort, or a warning and we
nuclear@26	551 ignore the data in this chunk (which should be OK, since
nuclear@26	552 it's considered ancillary for a RGB or RGBA image). */
nuclear@26	553 if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE))
nuclear@26	554 {
nuclear@26	555 if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)
nuclear@26	556 {
nuclear@26	557 png_chunk_error(png_ptr, "CRC error");
nuclear@26	558 }
nuclear@26	559 else
nuclear@26	560 {
nuclear@26	561 png_chunk_warning(png_ptr, "CRC error");
nuclear@26	562 return;
nuclear@26	563 }
nuclear@26	564 }
nuclear@26	565 /* Otherwise, we (optionally) emit a warning and use the chunk. */
nuclear@26	566 else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN))
nuclear@26	567 {
nuclear@26	568 png_chunk_warning(png_ptr, "CRC error");
nuclear@26	569 }
nuclear@26	570 }
nuclear@26	571 #endif
nuclear@26	572
nuclear@26	573 png_set_PLTE(png_ptr, info_ptr, palette, num);
nuclear@26	574
nuclear@26	575 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@26	576 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	577 {
nuclear@26	578 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
nuclear@26	579 {
nuclear@26	580 if (png_ptr->num_trans > (png_uint_16)num)
nuclear@26	581 {
nuclear@26	582 png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
nuclear@26	583 png_ptr->num_trans = (png_uint_16)num;
nuclear@26	584 }
nuclear@26	585 if (info_ptr->num_trans > (png_uint_16)num)
nuclear@26	586 {
nuclear@26	587 png_warning(png_ptr, "Truncating incorrect info tRNS chunk length");
nuclear@26	588 info_ptr->num_trans = (png_uint_16)num;
nuclear@26	589 }
nuclear@26	590 }
nuclear@26	591 }
nuclear@26	592 #endif
nuclear@26	593
nuclear@26	594 }
nuclear@26	595
nuclear@26	596 void /* PRIVATE */
nuclear@26	597 png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	598 {
nuclear@26	599 png_debug(1, "in png_handle_IEND\n");
nuclear@26	600
nuclear@26	601 if (!(png_ptr->mode & PNG_HAVE_IHDR) \|\| !(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@26	602 {
nuclear@26	603 png_error(png_ptr, "No image in file");
nuclear@26	604 }
nuclear@26	605
nuclear@26	606 png_ptr->mode \|= (PNG_AFTER_IDAT \| PNG_HAVE_IEND);
nuclear@26	607
nuclear@26	608 if (length != 0)
nuclear@26	609 {
nuclear@26	610 png_warning(png_ptr, "Incorrect IEND chunk length");
nuclear@26	611 }
nuclear@26	612 png_crc_finish(png_ptr, length);
nuclear@26	613
nuclear@26	614 info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
nuclear@26	615 }
nuclear@26	616
nuclear@26	617 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@26	618 void /* PRIVATE */
nuclear@26	619 png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	620 {
nuclear@26	621 png_fixed_point igamma;
nuclear@26	622 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	623 float file_gamma;
nuclear@26	624 #endif
nuclear@26	625 png_byte buf[4];
nuclear@26	626
nuclear@26	627 png_debug(1, "in png_handle_gAMA\n");
nuclear@26	628
nuclear@26	629 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	630 png_error(png_ptr, "Missing IHDR before gAMA");
nuclear@26	631 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	632 {
nuclear@26	633 png_warning(png_ptr, "Invalid gAMA after IDAT");
nuclear@26	634 png_crc_finish(png_ptr, length);
nuclear@26	635 return;
nuclear@26	636 }
nuclear@26	637 else if (png_ptr->mode & PNG_HAVE_PLTE)
nuclear@26	638 /* Should be an error, but we can cope with it */
nuclear@26	639 png_warning(png_ptr, "Out of place gAMA chunk");
nuclear@26	640
nuclear@26	641 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
nuclear@26	642 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@26	643 && !(info_ptr->valid & PNG_INFO_sRGB)
nuclear@26	644 #endif
nuclear@26	645 )
nuclear@26	646 {
nuclear@26	647 png_warning(png_ptr, "Duplicate gAMA chunk");
nuclear@26	648 png_crc_finish(png_ptr, length);
nuclear@26	649 return;
nuclear@26	650 }
nuclear@26	651
nuclear@26	652 if (length != 4)
nuclear@26	653 {
nuclear@26	654 png_warning(png_ptr, "Incorrect gAMA chunk length");
nuclear@26	655 png_crc_finish(png_ptr, length);
nuclear@26	656 return;
nuclear@26	657 }
nuclear@26	658
nuclear@26	659 png_crc_read(png_ptr, buf, 4);
nuclear@26	660 if (png_crc_finish(png_ptr, 0))
nuclear@26	661 return;
nuclear@26	662
nuclear@26	663 igamma = (png_fixed_point)png_get_uint_32(buf);
nuclear@26	664 /* check for zero gamma */
nuclear@26	665 if (igamma == 0)
nuclear@26	666 {
nuclear@26	667 png_warning(png_ptr,
nuclear@26	668 "Ignoring gAMA chunk with gamma=0");
nuclear@26	669 return;
nuclear@26	670 }
nuclear@26	671
nuclear@26	672 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@26	673 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
nuclear@26	674 if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
nuclear@26	675 {
nuclear@26	676 png_warning(png_ptr,
nuclear@26	677 "Ignoring incorrect gAMA value when sRGB is also present");
nuclear@26	678 #ifndef PNG_NO_CONSOLE_IO
nuclear@26	679 fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma);
nuclear@26	680 #endif
nuclear@26	681 return;
nuclear@26	682 }
nuclear@26	683 #endif /* PNG_READ_sRGB_SUPPORTED */
nuclear@26	684
nuclear@26	685 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	686 file_gamma = (float)igamma / (float)100000.0;
nuclear@26	687 # ifdef PNG_READ_GAMMA_SUPPORTED
nuclear@26	688 png_ptr->gamma = file_gamma;
nuclear@26	689 # endif
nuclear@26	690 png_set_gAMA(png_ptr, info_ptr, file_gamma);
nuclear@26	691 #endif
nuclear@26	692 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	693 png_set_gAMA_fixed(png_ptr, info_ptr, igamma);
nuclear@26	694 #endif
nuclear@26	695 }
nuclear@26	696 #endif
nuclear@26	697
nuclear@26	698 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@26	699 void /* PRIVATE */
nuclear@26	700 png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	701 {
nuclear@26	702 png_size_t truelen;
nuclear@26	703 png_byte buf[4];
nuclear@26	704
nuclear@26	705 png_debug(1, "in png_handle_sBIT\n");
nuclear@26	706
nuclear@26	707 buf[0] = buf[1] = buf[2] = buf[3] = 0;
nuclear@26	708
nuclear@26	709 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	710 png_error(png_ptr, "Missing IHDR before sBIT");
nuclear@26	711 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	712 {
nuclear@26	713 png_warning(png_ptr, "Invalid sBIT after IDAT");
nuclear@26	714 png_crc_finish(png_ptr, length);
nuclear@26	715 return;
nuclear@26	716 }
nuclear@26	717 else if (png_ptr->mode & PNG_HAVE_PLTE)
nuclear@26	718 {
nuclear@26	719 /* Should be an error, but we can cope with it */
nuclear@26	720 png_warning(png_ptr, "Out of place sBIT chunk");
nuclear@26	721 }
nuclear@26	722 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
nuclear@26	723 {
nuclear@26	724 png_warning(png_ptr, "Duplicate sBIT chunk");
nuclear@26	725 png_crc_finish(png_ptr, length);
nuclear@26	726 return;
nuclear@26	727 }
nuclear@26	728
nuclear@26	729 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	730 truelen = 3;
nuclear@26	731 else
nuclear@26	732 truelen = (png_size_t)png_ptr->channels;
nuclear@26	733
nuclear@26	734 if (length != truelen \|\| length > 4)
nuclear@26	735 {
nuclear@26	736 png_warning(png_ptr, "Incorrect sBIT chunk length");
nuclear@26	737 png_crc_finish(png_ptr, length);
nuclear@26	738 return;
nuclear@26	739 }
nuclear@26	740
nuclear@26	741 png_crc_read(png_ptr, buf, truelen);
nuclear@26	742 if (png_crc_finish(png_ptr, 0))
nuclear@26	743 return;
nuclear@26	744
nuclear@26	745 if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
nuclear@26	746 {
nuclear@26	747 png_ptr->sig_bit.red = buf[0];
nuclear@26	748 png_ptr->sig_bit.green = buf[1];
nuclear@26	749 png_ptr->sig_bit.blue = buf[2];
nuclear@26	750 png_ptr->sig_bit.alpha = buf[3];
nuclear@26	751 }
nuclear@26	752 else
nuclear@26	753 {
nuclear@26	754 png_ptr->sig_bit.gray = buf[0];
nuclear@26	755 png_ptr->sig_bit.red = buf[0];
nuclear@26	756 png_ptr->sig_bit.green = buf[0];
nuclear@26	757 png_ptr->sig_bit.blue = buf[0];
nuclear@26	758 png_ptr->sig_bit.alpha = buf[1];
nuclear@26	759 }
nuclear@26	760 png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
nuclear@26	761 }
nuclear@26	762 #endif
nuclear@26	763
nuclear@26	764 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@26	765 void /* PRIVATE */
nuclear@26	766 png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	767 {
nuclear@26	768 png_byte buf[32];
nuclear@26	769 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	770 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
nuclear@26	771 #endif
nuclear@26	772 png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
nuclear@26	773 int_y_green, int_x_blue, int_y_blue;
nuclear@26	774
nuclear@26	775 png_uint_32 uint_x, uint_y;
nuclear@26	776
nuclear@26	777 png_debug(1, "in png_handle_cHRM\n");
nuclear@26	778
nuclear@26	779 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	780 png_error(png_ptr, "Missing IHDR before cHRM");
nuclear@26	781 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	782 {
nuclear@26	783 png_warning(png_ptr, "Invalid cHRM after IDAT");
nuclear@26	784 png_crc_finish(png_ptr, length);
nuclear@26	785 return;
nuclear@26	786 }
nuclear@26	787 else if (png_ptr->mode & PNG_HAVE_PLTE)
nuclear@26	788 /* Should be an error, but we can cope with it */
nuclear@26	789 png_warning(png_ptr, "Missing PLTE before cHRM");
nuclear@26	790
nuclear@26	791 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
nuclear@26	792 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@26	793 && !(info_ptr->valid & PNG_INFO_sRGB)
nuclear@26	794 #endif
nuclear@26	795 )
nuclear@26	796 {
nuclear@26	797 png_warning(png_ptr, "Duplicate cHRM chunk");
nuclear@26	798 png_crc_finish(png_ptr, length);
nuclear@26	799 return;
nuclear@26	800 }
nuclear@26	801
nuclear@26	802 if (length != 32)
nuclear@26	803 {
nuclear@26	804 png_warning(png_ptr, "Incorrect cHRM chunk length");
nuclear@26	805 png_crc_finish(png_ptr, length);
nuclear@26	806 return;
nuclear@26	807 }
nuclear@26	808
nuclear@26	809 png_crc_read(png_ptr, buf, 32);
nuclear@26	810 if (png_crc_finish(png_ptr, 0))
nuclear@26	811 return;
nuclear@26	812
nuclear@26	813 uint_x = png_get_uint_32(buf);
nuclear@26	814 uint_y = png_get_uint_32(buf + 4);
nuclear@26	815 if (uint_x > 80000L \|\| uint_y > 80000L \|\|
nuclear@26	816 uint_x + uint_y > 100000L)
nuclear@26	817 {
nuclear@26	818 png_warning(png_ptr, "Invalid cHRM white point");
nuclear@26	819 return;
nuclear@26	820 }
nuclear@26	821 int_x_white = (png_fixed_point)uint_x;
nuclear@26	822 int_y_white = (png_fixed_point)uint_y;
nuclear@26	823
nuclear@26	824 uint_x = png_get_uint_32(buf + 8);
nuclear@26	825 uint_y = png_get_uint_32(buf + 12);
nuclear@26	826 if (uint_x + uint_y > 100000L)
nuclear@26	827 {
nuclear@26	828 png_warning(png_ptr, "Invalid cHRM red point");
nuclear@26	829 return;
nuclear@26	830 }
nuclear@26	831 int_x_red = (png_fixed_point)uint_x;
nuclear@26	832 int_y_red = (png_fixed_point)uint_y;
nuclear@26	833
nuclear@26	834 uint_x = png_get_uint_32(buf + 16);
nuclear@26	835 uint_y = png_get_uint_32(buf + 20);
nuclear@26	836 if (uint_x + uint_y > 100000L)
nuclear@26	837 {
nuclear@26	838 png_warning(png_ptr, "Invalid cHRM green point");
nuclear@26	839 return;
nuclear@26	840 }
nuclear@26	841 int_x_green = (png_fixed_point)uint_x;
nuclear@26	842 int_y_green = (png_fixed_point)uint_y;
nuclear@26	843
nuclear@26	844 uint_x = png_get_uint_32(buf + 24);
nuclear@26	845 uint_y = png_get_uint_32(buf + 28);
nuclear@26	846 if (uint_x + uint_y > 100000L)
nuclear@26	847 {
nuclear@26	848 png_warning(png_ptr, "Invalid cHRM blue point");
nuclear@26	849 return;
nuclear@26	850 }
nuclear@26	851 int_x_blue = (png_fixed_point)uint_x;
nuclear@26	852 int_y_blue = (png_fixed_point)uint_y;
nuclear@26	853
nuclear@26	854 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	855 white_x = (float)int_x_white / (float)100000.0;
nuclear@26	856 white_y = (float)int_y_white / (float)100000.0;
nuclear@26	857 red_x = (float)int_x_red / (float)100000.0;
nuclear@26	858 red_y = (float)int_y_red / (float)100000.0;
nuclear@26	859 green_x = (float)int_x_green / (float)100000.0;
nuclear@26	860 green_y = (float)int_y_green / (float)100000.0;
nuclear@26	861 blue_x = (float)int_x_blue / (float)100000.0;
nuclear@26	862 blue_y = (float)int_y_blue / (float)100000.0;
nuclear@26	863 #endif
nuclear@26	864
nuclear@26	865 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@26	866 if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB))
nuclear@26	867 {
nuclear@26	868 if (PNG_OUT_OF_RANGE(int_x_white, 31270, 1000) \|\|
nuclear@26	869 PNG_OUT_OF_RANGE(int_y_white, 32900, 1000) \|\|
nuclear@26	870 PNG_OUT_OF_RANGE(int_x_red, 64000L, 1000) \|\|
nuclear@26	871 PNG_OUT_OF_RANGE(int_y_red, 33000, 1000) \|\|
nuclear@26	872 PNG_OUT_OF_RANGE(int_x_green, 30000, 1000) \|\|
nuclear@26	873 PNG_OUT_OF_RANGE(int_y_green, 60000L, 1000) \|\|
nuclear@26	874 PNG_OUT_OF_RANGE(int_x_blue, 15000, 1000) \|\|
nuclear@26	875 PNG_OUT_OF_RANGE(int_y_blue, 6000, 1000))
nuclear@26	876 {
nuclear@26	877 png_warning(png_ptr,
nuclear@26	878 "Ignoring incorrect cHRM value when sRGB is also present");
nuclear@26	879 #ifndef PNG_NO_CONSOLE_IO
nuclear@26	880 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	881 fprintf(stderr, "wx=%f, wy=%f, rx=%f, ry=%f\n",
nuclear@26	882 white_x, white_y, red_x, red_y);
nuclear@26	883 fprintf(stderr, "gx=%f, gy=%f, bx=%f, by=%f\n",
nuclear@26	884 green_x, green_y, blue_x, blue_y);
nuclear@26	885 #else
nuclear@26	886 fprintf(stderr, "wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
nuclear@26	887 int_x_white, int_y_white, int_x_red, int_y_red);
nuclear@26	888 fprintf(stderr, "gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
nuclear@26	889 int_x_green, int_y_green, int_x_blue, int_y_blue);
nuclear@26	890 #endif
nuclear@26	891 #endif /* PNG_NO_CONSOLE_IO */
nuclear@26	892 }
nuclear@26	893 return;
nuclear@26	894 }
nuclear@26	895 #endif /* PNG_READ_sRGB_SUPPORTED */
nuclear@26	896
nuclear@26	897 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	898 png_set_cHRM(png_ptr, info_ptr,
nuclear@26	899 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
nuclear@26	900 #endif
nuclear@26	901 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	902 png_set_cHRM_fixed(png_ptr, info_ptr,
nuclear@26	903 int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
nuclear@26	904 int_y_green, int_x_blue, int_y_blue);
nuclear@26	905 #endif
nuclear@26	906 }
nuclear@26	907 #endif
nuclear@26	908
nuclear@26	909 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@26	910 void /* PRIVATE */
nuclear@26	911 png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	912 {
nuclear@26	913 int intent;
nuclear@26	914 png_byte buf[1];
nuclear@26	915
nuclear@26	916 png_debug(1, "in png_handle_sRGB\n");
nuclear@26	917
nuclear@26	918 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	919 png_error(png_ptr, "Missing IHDR before sRGB");
nuclear@26	920 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	921 {
nuclear@26	922 png_warning(png_ptr, "Invalid sRGB after IDAT");
nuclear@26	923 png_crc_finish(png_ptr, length);
nuclear@26	924 return;
nuclear@26	925 }
nuclear@26	926 else if (png_ptr->mode & PNG_HAVE_PLTE)
nuclear@26	927 /* Should be an error, but we can cope with it */
nuclear@26	928 png_warning(png_ptr, "Out of place sRGB chunk");
nuclear@26	929
nuclear@26	930 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
nuclear@26	931 {
nuclear@26	932 png_warning(png_ptr, "Duplicate sRGB chunk");
nuclear@26	933 png_crc_finish(png_ptr, length);
nuclear@26	934 return;
nuclear@26	935 }
nuclear@26	936
nuclear@26	937 if (length != 1)
nuclear@26	938 {
nuclear@26	939 png_warning(png_ptr, "Incorrect sRGB chunk length");
nuclear@26	940 png_crc_finish(png_ptr, length);
nuclear@26	941 return;
nuclear@26	942 }
nuclear@26	943
nuclear@26	944 png_crc_read(png_ptr, buf, 1);
nuclear@26	945 if (png_crc_finish(png_ptr, 0))
nuclear@26	946 return;
nuclear@26	947
nuclear@26	948 intent = buf[0];
nuclear@26	949 /* check for bad intent */
nuclear@26	950 if (intent >= PNG_sRGB_INTENT_LAST)
nuclear@26	951 {
nuclear@26	952 png_warning(png_ptr, "Unknown sRGB intent");
nuclear@26	953 return;
nuclear@26	954 }
nuclear@26	955
nuclear@26	956 #if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26	957 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA))
nuclear@26	958 {
nuclear@26	959 png_fixed_point igamma;
nuclear@26	960 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	961 igamma=info_ptr->int_gamma;
nuclear@26	962 #else
nuclear@26	963 # ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	964 igamma=(png_fixed_point)(info_ptr->gamma * 100000.);
nuclear@26	965 # endif
nuclear@26	966 #endif
nuclear@26	967 if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
nuclear@26	968 {
nuclear@26	969 png_warning(png_ptr,
nuclear@26	970 "Ignoring incorrect gAMA value when sRGB is also present");
nuclear@26	971 #ifndef PNG_NO_CONSOLE_IO
nuclear@26	972 # ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	973 fprintf(stderr, "incorrect gamma=(%d/100000)\n",
nuclear@26	974 (int)png_ptr->int_gamma);
nuclear@26	975 # else
nuclear@26	976 # ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	977 fprintf(stderr, "incorrect gamma=%f\n", png_ptr->gamma);
nuclear@26	978 # endif
nuclear@26	979 # endif
nuclear@26	980 #endif
nuclear@26	981 }
nuclear@26	982 }
nuclear@26	983 #endif /* PNG_READ_gAMA_SUPPORTED */
nuclear@26	984
nuclear@26	985 #ifdef PNG_READ_cHRM_SUPPORTED
nuclear@26	986 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	987 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
nuclear@26	988 if (PNG_OUT_OF_RANGE(info_ptr->int_x_white, 31270, 1000) \|\|
nuclear@26	989 PNG_OUT_OF_RANGE(info_ptr->int_y_white, 32900, 1000) \|\|
nuclear@26	990 PNG_OUT_OF_RANGE(info_ptr->int_x_red, 64000L, 1000) \|\|
nuclear@26	991 PNG_OUT_OF_RANGE(info_ptr->int_y_red, 33000, 1000) \|\|
nuclear@26	992 PNG_OUT_OF_RANGE(info_ptr->int_x_green, 30000, 1000) \|\|
nuclear@26	993 PNG_OUT_OF_RANGE(info_ptr->int_y_green, 60000L, 1000) \|\|
nuclear@26	994 PNG_OUT_OF_RANGE(info_ptr->int_x_blue, 15000, 1000) \|\|
nuclear@26	995 PNG_OUT_OF_RANGE(info_ptr->int_y_blue, 6000, 1000))
nuclear@26	996 {
nuclear@26	997 png_warning(png_ptr,
nuclear@26	998 "Ignoring incorrect cHRM value when sRGB is also present");
nuclear@26	999 }
nuclear@26	1000 #endif /* PNG_FIXED_POINT_SUPPORTED */
nuclear@26	1001 #endif /* PNG_READ_cHRM_SUPPORTED */
nuclear@26	1002
nuclear@26	1003 png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
nuclear@26	1004 }
nuclear@26	1005 #endif /* PNG_READ_sRGB_SUPPORTED */
nuclear@26	1006
nuclear@26	1007 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@26	1008 void /* PRIVATE */
nuclear@26	1009 png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1010 /* Note: this does not properly handle chunks that are > 64K under DOS */
nuclear@26	1011 {
nuclear@26	1012 png_byte compression_type;
nuclear@26	1013 png_bytep pC;
nuclear@26	1014 png_charp profile;
nuclear@26	1015 png_uint_32 skip = 0;
nuclear@26	1016 png_uint_32 profile_size, profile_length;
nuclear@26	1017 png_size_t slength, prefix_length, data_length;
nuclear@26	1018
nuclear@26	1019 png_debug(1, "in png_handle_iCCP\n");
nuclear@26	1020
nuclear@26	1021 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1022 png_error(png_ptr, "Missing IHDR before iCCP");
nuclear@26	1023 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1024 {
nuclear@26	1025 png_warning(png_ptr, "Invalid iCCP after IDAT");
nuclear@26	1026 png_crc_finish(png_ptr, length);
nuclear@26	1027 return;
nuclear@26	1028 }
nuclear@26	1029 else if (png_ptr->mode & PNG_HAVE_PLTE)
nuclear@26	1030 /* Should be an error, but we can cope with it */
nuclear@26	1031 png_warning(png_ptr, "Out of place iCCP chunk");
nuclear@26	1032
nuclear@26	1033 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP))
nuclear@26	1034 {
nuclear@26	1035 png_warning(png_ptr, "Duplicate iCCP chunk");
nuclear@26	1036 png_crc_finish(png_ptr, length);
nuclear@26	1037 return;
nuclear@26	1038 }
nuclear@26	1039
nuclear@26	1040 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	1041 if (length > (png_uint_32)65535L)
nuclear@26	1042 {
nuclear@26	1043 png_warning(png_ptr, "iCCP chunk too large to fit in memory");
nuclear@26	1044 skip = length - (png_uint_32)65535L;
nuclear@26	1045 length = (png_uint_32)65535L;
nuclear@26	1046 }
nuclear@26	1047 #endif
nuclear@26	1048
nuclear@26	1049 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1050 png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
nuclear@26	1051 slength = (png_size_t)length;
nuclear@26	1052 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
nuclear@26	1053
nuclear@26	1054 if (png_crc_finish(png_ptr, skip))
nuclear@26	1055 {
nuclear@26	1056 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1057 png_ptr->chunkdata = NULL;
nuclear@26	1058 return;
nuclear@26	1059 }
nuclear@26	1060
nuclear@26	1061 png_ptr->chunkdata[slength] = 0x00;
nuclear@26	1062
nuclear@26	1063 for (profile = png_ptr->chunkdata; *profile; profile++)
nuclear@26	1064 /* empty loop to find end of name */ ;
nuclear@26	1065
nuclear@26	1066 ++profile;
nuclear@26	1067
nuclear@26	1068 /* there should be at least one zero (the compression type byte)
nuclear@26	1069 following the separator, and we should be on it */
nuclear@26	1070 if ( profile >= png_ptr->chunkdata + slength - 1)
nuclear@26	1071 {
nuclear@26	1072 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1073 png_ptr->chunkdata = NULL;
nuclear@26	1074 png_warning(png_ptr, "Malformed iCCP chunk");
nuclear@26	1075 return;
nuclear@26	1076 }
nuclear@26	1077
nuclear@26	1078 /* compression_type should always be zero */
nuclear@26	1079 compression_type = *profile++;
nuclear@26	1080 if (compression_type)
nuclear@26	1081 {
nuclear@26	1082 png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
nuclear@26	1083 compression_type = 0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8
nuclear@26	1084 wrote nonzero) */
nuclear@26	1085 }
nuclear@26	1086
nuclear@26	1087 prefix_length = profile - png_ptr->chunkdata;
nuclear@26	1088 png_decompress_chunk(png_ptr, compression_type,
nuclear@26	1089 slength, prefix_length, &data_length);
nuclear@26	1090
nuclear@26	1091 profile_length = data_length - prefix_length;
nuclear@26	1092
nuclear@26	1093 if ( prefix_length > data_length \|\| profile_length < 4)
nuclear@26	1094 {
nuclear@26	1095 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1096 png_ptr->chunkdata = NULL;
nuclear@26	1097 png_warning(png_ptr, "Profile size field missing from iCCP chunk");
nuclear@26	1098 return;
nuclear@26	1099 }
nuclear@26	1100
nuclear@26	1101 /* Check the profile_size recorded in the first 32 bits of the ICC profile */
nuclear@26	1102 pC = (png_bytep)(png_ptr->chunkdata + prefix_length);
nuclear@26	1103 profile_size = ((*(pC ))<<24) \|
nuclear@26	1104 ((*(pC + 1))<<16) \|
nuclear@26	1105 ((*(pC + 2))<< 8) \|
nuclear@26	1106 ((*(pC + 3)) );
nuclear@26	1107
nuclear@26	1108 if (profile_size < profile_length)
nuclear@26	1109 profile_length = profile_size;
nuclear@26	1110
nuclear@26	1111 if (profile_size > profile_length)
nuclear@26	1112 {
nuclear@26	1113 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1114 png_ptr->chunkdata = NULL;
nuclear@26	1115 png_warning(png_ptr, "Ignoring truncated iCCP profile.");
nuclear@26	1116 return;
nuclear@26	1117 }
nuclear@26	1118
nuclear@26	1119 png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata,
nuclear@26	1120 compression_type, png_ptr->chunkdata + prefix_length, profile_length);
nuclear@26	1121 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1122 png_ptr->chunkdata = NULL;
nuclear@26	1123 }
nuclear@26	1124 #endif /* PNG_READ_iCCP_SUPPORTED */
nuclear@26	1125
nuclear@26	1126 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@26	1127 void /* PRIVATE */
nuclear@26	1128 png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1129 /* Note: this does not properly handle chunks that are > 64K under DOS */
nuclear@26	1130 {
nuclear@26	1131 png_bytep entry_start;
nuclear@26	1132 png_sPLT_t new_palette;
nuclear@26	1133 #ifdef PNG_NO_POINTER_INDEXING
nuclear@26	1134 png_sPLT_entryp pp;
nuclear@26	1135 #endif
nuclear@26	1136 int data_length, entry_size, i;
nuclear@26	1137 png_uint_32 skip = 0;
nuclear@26	1138 png_size_t slength;
nuclear@26	1139
nuclear@26	1140 png_debug(1, "in png_handle_sPLT\n");
nuclear@26	1141
nuclear@26	1142 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1143 png_error(png_ptr, "Missing IHDR before sPLT");
nuclear@26	1144 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1145 {
nuclear@26	1146 png_warning(png_ptr, "Invalid sPLT after IDAT");
nuclear@26	1147 png_crc_finish(png_ptr, length);
nuclear@26	1148 return;
nuclear@26	1149 }
nuclear@26	1150
nuclear@26	1151 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	1152 if (length > (png_uint_32)65535L)
nuclear@26	1153 {
nuclear@26	1154 png_warning(png_ptr, "sPLT chunk too large to fit in memory");
nuclear@26	1155 skip = length - (png_uint_32)65535L;
nuclear@26	1156 length = (png_uint_32)65535L;
nuclear@26	1157 }
nuclear@26	1158 #endif
nuclear@26	1159
nuclear@26	1160 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1161 png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
nuclear@26	1162 slength = (png_size_t)length;
nuclear@26	1163 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
nuclear@26	1164
nuclear@26	1165 if (png_crc_finish(png_ptr, skip))
nuclear@26	1166 {
nuclear@26	1167 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1168 png_ptr->chunkdata = NULL;
nuclear@26	1169 return;
nuclear@26	1170 }
nuclear@26	1171
nuclear@26	1172 png_ptr->chunkdata[slength] = 0x00;
nuclear@26	1173
nuclear@26	1174 for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; entry_start++)
nuclear@26	1175 /* empty loop to find end of name */ ;
nuclear@26	1176 ++entry_start;
nuclear@26	1177
nuclear@26	1178 /* a sample depth should follow the separator, and we should be on it */
nuclear@26	1179 if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2)
nuclear@26	1180 {
nuclear@26	1181 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1182 png_ptr->chunkdata = NULL;
nuclear@26	1183 png_warning(png_ptr, "malformed sPLT chunk");
nuclear@26	1184 return;
nuclear@26	1185 }
nuclear@26	1186
nuclear@26	1187 new_palette.depth = *entry_start++;
nuclear@26	1188 entry_size = (new_palette.depth == 8 ? 6 : 10);
nuclear@26	1189 data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
nuclear@26	1190
nuclear@26	1191 /* integrity-check the data length */
nuclear@26	1192 if (data_length % entry_size)
nuclear@26	1193 {
nuclear@26	1194 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1195 png_ptr->chunkdata = NULL;
nuclear@26	1196 png_warning(png_ptr, "sPLT chunk has bad length");
nuclear@26	1197 return;
nuclear@26	1198 }
nuclear@26	1199
nuclear@26	1200 new_palette.nentries = (png_int_32) ( data_length / entry_size);
nuclear@26	1201 if ((png_uint_32) new_palette.nentries >
nuclear@26	1202 (png_uint_32) (PNG_SIZE_MAX / png_sizeof(png_sPLT_entry)))
nuclear@26	1203 {
nuclear@26	1204 png_warning(png_ptr, "sPLT chunk too long");
nuclear@26	1205 return;
nuclear@26	1206 }
nuclear@26	1207 new_palette.entries = (png_sPLT_entryp)png_malloc_warn(
nuclear@26	1208 png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry));
nuclear@26	1209 if (new_palette.entries == NULL)
nuclear@26	1210 {
nuclear@26	1211 png_warning(png_ptr, "sPLT chunk requires too much memory");
nuclear@26	1212 return;
nuclear@26	1213 }
nuclear@26	1214
nuclear@26	1215 #ifndef PNG_NO_POINTER_INDEXING
nuclear@26	1216 for (i = 0; i < new_palette.nentries; i++)
nuclear@26	1217 {
nuclear@26	1218 png_sPLT_entryp pp = new_palette.entries + i;
nuclear@26	1219
nuclear@26	1220 if (new_palette.depth == 8)
nuclear@26	1221 {
nuclear@26	1222 pp->red = *entry_start++;
nuclear@26	1223 pp->green = *entry_start++;
nuclear@26	1224 pp->blue = *entry_start++;
nuclear@26	1225 pp->alpha = *entry_start++;
nuclear@26	1226 }
nuclear@26	1227 else
nuclear@26	1228 {
nuclear@26	1229 pp->red = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1230 pp->green = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1231 pp->blue = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1232 pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1233 }
nuclear@26	1234 pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1235 }
nuclear@26	1236 #else
nuclear@26	1237 pp = new_palette.entries;
nuclear@26	1238 for (i = 0; i < new_palette.nentries; i++)
nuclear@26	1239 {
nuclear@26	1240
nuclear@26	1241 if (new_palette.depth == 8)
nuclear@26	1242 {
nuclear@26	1243 pp[i].red = *entry_start++;
nuclear@26	1244 pp[i].green = *entry_start++;
nuclear@26	1245 pp[i].blue = *entry_start++;
nuclear@26	1246 pp[i].alpha = *entry_start++;
nuclear@26	1247 }
nuclear@26	1248 else
nuclear@26	1249 {
nuclear@26	1250 pp[i].red = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1251 pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1252 pp[i].blue = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1253 pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1254 }
nuclear@26	1255 pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
nuclear@26	1256 }
nuclear@26	1257 #endif
nuclear@26	1258
nuclear@26	1259 /* discard all chunk data except the name and stash that */
nuclear@26	1260 new_palette.name = png_ptr->chunkdata;
nuclear@26	1261
nuclear@26	1262 png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
nuclear@26	1263
nuclear@26	1264 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1265 png_ptr->chunkdata = NULL;
nuclear@26	1266 png_free(png_ptr, new_palette.entries);
nuclear@26	1267 }
nuclear@26	1268 #endif /* PNG_READ_sPLT_SUPPORTED */
nuclear@26	1269
nuclear@26	1270 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@26	1271 void /* PRIVATE */
nuclear@26	1272 png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1273 {
nuclear@26	1274 png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
nuclear@26	1275
nuclear@26	1276 png_debug(1, "in png_handle_tRNS\n");
nuclear@26	1277
nuclear@26	1278 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1279 png_error(png_ptr, "Missing IHDR before tRNS");
nuclear@26	1280 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1281 {
nuclear@26	1282 png_warning(png_ptr, "Invalid tRNS after IDAT");
nuclear@26	1283 png_crc_finish(png_ptr, length);
nuclear@26	1284 return;
nuclear@26	1285 }
nuclear@26	1286 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
nuclear@26	1287 {
nuclear@26	1288 png_warning(png_ptr, "Duplicate tRNS chunk");
nuclear@26	1289 png_crc_finish(png_ptr, length);
nuclear@26	1290 return;
nuclear@26	1291 }
nuclear@26	1292
nuclear@26	1293 if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
nuclear@26	1294 {
nuclear@26	1295 png_byte buf[2];
nuclear@26	1296
nuclear@26	1297 if (length != 2)
nuclear@26	1298 {
nuclear@26	1299 png_warning(png_ptr, "Incorrect tRNS chunk length");
nuclear@26	1300 png_crc_finish(png_ptr, length);
nuclear@26	1301 return;
nuclear@26	1302 }
nuclear@26	1303
nuclear@26	1304 png_crc_read(png_ptr, buf, 2);
nuclear@26	1305 png_ptr->num_trans = 1;
nuclear@26	1306 png_ptr->trans_values.gray = png_get_uint_16(buf);
nuclear@26	1307 }
nuclear@26	1308 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
nuclear@26	1309 {
nuclear@26	1310 png_byte buf[6];
nuclear@26	1311
nuclear@26	1312 if (length != 6)
nuclear@26	1313 {
nuclear@26	1314 png_warning(png_ptr, "Incorrect tRNS chunk length");
nuclear@26	1315 png_crc_finish(png_ptr, length);
nuclear@26	1316 return;
nuclear@26	1317 }
nuclear@26	1318 png_crc_read(png_ptr, buf, (png_size_t)length);
nuclear@26	1319 png_ptr->num_trans = 1;
nuclear@26	1320 png_ptr->trans_values.red = png_get_uint_16(buf);
nuclear@26	1321 png_ptr->trans_values.green = png_get_uint_16(buf + 2);
nuclear@26	1322 png_ptr->trans_values.blue = png_get_uint_16(buf + 4);
nuclear@26	1323 }
nuclear@26	1324 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	1325 {
nuclear@26	1326 if (!(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@26	1327 {
nuclear@26	1328 /* Should be an error, but we can cope with it. */
nuclear@26	1329 png_warning(png_ptr, "Missing PLTE before tRNS");
nuclear@26	1330 }
nuclear@26	1331 if (length > (png_uint_32)png_ptr->num_palette \|\|
nuclear@26	1332 length > PNG_MAX_PALETTE_LENGTH)
nuclear@26	1333 {
nuclear@26	1334 png_warning(png_ptr, "Incorrect tRNS chunk length");
nuclear@26	1335 png_crc_finish(png_ptr, length);
nuclear@26	1336 return;
nuclear@26	1337 }
nuclear@26	1338 if (length == 0)
nuclear@26	1339 {
nuclear@26	1340 png_warning(png_ptr, "Zero length tRNS chunk");
nuclear@26	1341 png_crc_finish(png_ptr, length);
nuclear@26	1342 return;
nuclear@26	1343 }
nuclear@26	1344 png_crc_read(png_ptr, readbuf, (png_size_t)length);
nuclear@26	1345 png_ptr->num_trans = (png_uint_16)length;
nuclear@26	1346 }
nuclear@26	1347 else
nuclear@26	1348 {
nuclear@26	1349 png_warning(png_ptr, "tRNS chunk not allowed with alpha channel");
nuclear@26	1350 png_crc_finish(png_ptr, length);
nuclear@26	1351 return;
nuclear@26	1352 }
nuclear@26	1353
nuclear@26	1354 if (png_crc_finish(png_ptr, 0))
nuclear@26	1355 {
nuclear@26	1356 png_ptr->num_trans = 0;
nuclear@26	1357 return;
nuclear@26	1358 }
nuclear@26	1359
nuclear@26	1360 png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
nuclear@26	1361 &(png_ptr->trans_values));
nuclear@26	1362 }
nuclear@26	1363 #endif
nuclear@26	1364
nuclear@26	1365 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@26	1366 void /* PRIVATE */
nuclear@26	1367 png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1368 {
nuclear@26	1369 png_size_t truelen;
nuclear@26	1370 png_byte buf[6];
nuclear@26	1371
nuclear@26	1372 png_debug(1, "in png_handle_bKGD\n");
nuclear@26	1373
nuclear@26	1374 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1375 png_error(png_ptr, "Missing IHDR before bKGD");
nuclear@26	1376 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1377 {
nuclear@26	1378 png_warning(png_ptr, "Invalid bKGD after IDAT");
nuclear@26	1379 png_crc_finish(png_ptr, length);
nuclear@26	1380 return;
nuclear@26	1381 }
nuclear@26	1382 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@26	1383 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@26	1384 {
nuclear@26	1385 png_warning(png_ptr, "Missing PLTE before bKGD");
nuclear@26	1386 png_crc_finish(png_ptr, length);
nuclear@26	1387 return;
nuclear@26	1388 }
nuclear@26	1389 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
nuclear@26	1390 {
nuclear@26	1391 png_warning(png_ptr, "Duplicate bKGD chunk");
nuclear@26	1392 png_crc_finish(png_ptr, length);
nuclear@26	1393 return;
nuclear@26	1394 }
nuclear@26	1395
nuclear@26	1396 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	1397 truelen = 1;
nuclear@26	1398 else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
nuclear@26	1399 truelen = 6;
nuclear@26	1400 else
nuclear@26	1401 truelen = 2;
nuclear@26	1402
nuclear@26	1403 if (length != truelen)
nuclear@26	1404 {
nuclear@26	1405 png_warning(png_ptr, "Incorrect bKGD chunk length");
nuclear@26	1406 png_crc_finish(png_ptr, length);
nuclear@26	1407 return;
nuclear@26	1408 }
nuclear@26	1409
nuclear@26	1410 png_crc_read(png_ptr, buf, truelen);
nuclear@26	1411 if (png_crc_finish(png_ptr, 0))
nuclear@26	1412 return;
nuclear@26	1413
nuclear@26	1414 /* We convert the index value into RGB components so that we can allow
nuclear@26	1415 * arbitrary RGB values for background when we have transparency, and
nuclear@26	1416 * so it is easy to determine the RGB values of the background color
nuclear@26	1417 * from the info_ptr struct. */
nuclear@26	1418 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	1419 {
nuclear@26	1420 png_ptr->background.index = buf[0];
nuclear@26	1421 if (info_ptr && info_ptr->num_palette)
nuclear@26	1422 {
nuclear@26	1423 if (buf[0] > info_ptr->num_palette)
nuclear@26	1424 {
nuclear@26	1425 png_warning(png_ptr, "Incorrect bKGD chunk index value");
nuclear@26	1426 return;
nuclear@26	1427 }
nuclear@26	1428 png_ptr->background.red =
nuclear@26	1429 (png_uint_16)png_ptr->palette[buf[0]].red;
nuclear@26	1430 png_ptr->background.green =
nuclear@26	1431 (png_uint_16)png_ptr->palette[buf[0]].green;
nuclear@26	1432 png_ptr->background.blue =
nuclear@26	1433 (png_uint_16)png_ptr->palette[buf[0]].blue;
nuclear@26	1434 }
nuclear@26	1435 }
nuclear@26	1436 else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */
nuclear@26	1437 {
nuclear@26	1438 png_ptr->background.red =
nuclear@26	1439 png_ptr->background.green =
nuclear@26	1440 png_ptr->background.blue =
nuclear@26	1441 png_ptr->background.gray = png_get_uint_16(buf);
nuclear@26	1442 }
nuclear@26	1443 else
nuclear@26	1444 {
nuclear@26	1445 png_ptr->background.red = png_get_uint_16(buf);
nuclear@26	1446 png_ptr->background.green = png_get_uint_16(buf + 2);
nuclear@26	1447 png_ptr->background.blue = png_get_uint_16(buf + 4);
nuclear@26	1448 }
nuclear@26	1449
nuclear@26	1450 png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background));
nuclear@26	1451 }
nuclear@26	1452 #endif
nuclear@26	1453
nuclear@26	1454 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@26	1455 void /* PRIVATE */
nuclear@26	1456 png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1457 {
nuclear@26	1458 unsigned int num, i;
nuclear@26	1459 png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
nuclear@26	1460
nuclear@26	1461 png_debug(1, "in png_handle_hIST\n");
nuclear@26	1462
nuclear@26	1463 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1464 png_error(png_ptr, "Missing IHDR before hIST");
nuclear@26	1465 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1466 {
nuclear@26	1467 png_warning(png_ptr, "Invalid hIST after IDAT");
nuclear@26	1468 png_crc_finish(png_ptr, length);
nuclear@26	1469 return;
nuclear@26	1470 }
nuclear@26	1471 else if (!(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@26	1472 {
nuclear@26	1473 png_warning(png_ptr, "Missing PLTE before hIST");
nuclear@26	1474 png_crc_finish(png_ptr, length);
nuclear@26	1475 return;
nuclear@26	1476 }
nuclear@26	1477 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
nuclear@26	1478 {
nuclear@26	1479 png_warning(png_ptr, "Duplicate hIST chunk");
nuclear@26	1480 png_crc_finish(png_ptr, length);
nuclear@26	1481 return;
nuclear@26	1482 }
nuclear@26	1483
nuclear@26	1484 num = length / 2 ;
nuclear@26	1485 if (num != (unsigned int) png_ptr->num_palette \|\| num >
nuclear@26	1486 (unsigned int) PNG_MAX_PALETTE_LENGTH)
nuclear@26	1487 {
nuclear@26	1488 png_warning(png_ptr, "Incorrect hIST chunk length");
nuclear@26	1489 png_crc_finish(png_ptr, length);
nuclear@26	1490 return;
nuclear@26	1491 }
nuclear@26	1492
nuclear@26	1493 for (i = 0; i < num; i++)
nuclear@26	1494 {
nuclear@26	1495 png_byte buf[2];
nuclear@26	1496
nuclear@26	1497 png_crc_read(png_ptr, buf, 2);
nuclear@26	1498 readbuf[i] = png_get_uint_16(buf);
nuclear@26	1499 }
nuclear@26	1500
nuclear@26	1501 if (png_crc_finish(png_ptr, 0))
nuclear@26	1502 return;
nuclear@26	1503
nuclear@26	1504 png_set_hIST(png_ptr, info_ptr, readbuf);
nuclear@26	1505 }
nuclear@26	1506 #endif
nuclear@26	1507
nuclear@26	1508 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@26	1509 void /* PRIVATE */
nuclear@26	1510 png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1511 {
nuclear@26	1512 png_byte buf[9];
nuclear@26	1513 png_uint_32 res_x, res_y;
nuclear@26	1514 int unit_type;
nuclear@26	1515
nuclear@26	1516 png_debug(1, "in png_handle_pHYs\n");
nuclear@26	1517
nuclear@26	1518 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1519 png_error(png_ptr, "Missing IHDR before pHYs");
nuclear@26	1520 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1521 {
nuclear@26	1522 png_warning(png_ptr, "Invalid pHYs after IDAT");
nuclear@26	1523 png_crc_finish(png_ptr, length);
nuclear@26	1524 return;
nuclear@26	1525 }
nuclear@26	1526 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
nuclear@26	1527 {
nuclear@26	1528 png_warning(png_ptr, "Duplicate pHYs chunk");
nuclear@26	1529 png_crc_finish(png_ptr, length);
nuclear@26	1530 return;
nuclear@26	1531 }
nuclear@26	1532
nuclear@26	1533 if (length != 9)
nuclear@26	1534 {
nuclear@26	1535 png_warning(png_ptr, "Incorrect pHYs chunk length");
nuclear@26	1536 png_crc_finish(png_ptr, length);
nuclear@26	1537 return;
nuclear@26	1538 }
nuclear@26	1539
nuclear@26	1540 png_crc_read(png_ptr, buf, 9);
nuclear@26	1541 if (png_crc_finish(png_ptr, 0))
nuclear@26	1542 return;
nuclear@26	1543
nuclear@26	1544 res_x = png_get_uint_32(buf);
nuclear@26	1545 res_y = png_get_uint_32(buf + 4);
nuclear@26	1546 unit_type = buf[8];
nuclear@26	1547 png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type);
nuclear@26	1548 }
nuclear@26	1549 #endif
nuclear@26	1550
nuclear@26	1551 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@26	1552 void /* PRIVATE */
nuclear@26	1553 png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1554 {
nuclear@26	1555 png_byte buf[9];
nuclear@26	1556 png_int_32 offset_x, offset_y;
nuclear@26	1557 int unit_type;
nuclear@26	1558
nuclear@26	1559 png_debug(1, "in png_handle_oFFs\n");
nuclear@26	1560
nuclear@26	1561 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1562 png_error(png_ptr, "Missing IHDR before oFFs");
nuclear@26	1563 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1564 {
nuclear@26	1565 png_warning(png_ptr, "Invalid oFFs after IDAT");
nuclear@26	1566 png_crc_finish(png_ptr, length);
nuclear@26	1567 return;
nuclear@26	1568 }
nuclear@26	1569 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
nuclear@26	1570 {
nuclear@26	1571 png_warning(png_ptr, "Duplicate oFFs chunk");
nuclear@26	1572 png_crc_finish(png_ptr, length);
nuclear@26	1573 return;
nuclear@26	1574 }
nuclear@26	1575
nuclear@26	1576 if (length != 9)
nuclear@26	1577 {
nuclear@26	1578 png_warning(png_ptr, "Incorrect oFFs chunk length");
nuclear@26	1579 png_crc_finish(png_ptr, length);
nuclear@26	1580 return;
nuclear@26	1581 }
nuclear@26	1582
nuclear@26	1583 png_crc_read(png_ptr, buf, 9);
nuclear@26	1584 if (png_crc_finish(png_ptr, 0))
nuclear@26	1585 return;
nuclear@26	1586
nuclear@26	1587 offset_x = png_get_int_32(buf);
nuclear@26	1588 offset_y = png_get_int_32(buf + 4);
nuclear@26	1589 unit_type = buf[8];
nuclear@26	1590 png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
nuclear@26	1591 }
nuclear@26	1592 #endif
nuclear@26	1593
nuclear@26	1594 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@26	1595 /* read the pCAL chunk (described in the PNG Extensions document) */
nuclear@26	1596 void /* PRIVATE */
nuclear@26	1597 png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1598 {
nuclear@26	1599 png_int_32 X0, X1;
nuclear@26	1600 png_byte type, nparams;
nuclear@26	1601 png_charp buf, units, endptr;
nuclear@26	1602 png_charpp params;
nuclear@26	1603 png_size_t slength;
nuclear@26	1604 int i;
nuclear@26	1605
nuclear@26	1606 png_debug(1, "in png_handle_pCAL\n");
nuclear@26	1607
nuclear@26	1608 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1609 png_error(png_ptr, "Missing IHDR before pCAL");
nuclear@26	1610 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1611 {
nuclear@26	1612 png_warning(png_ptr, "Invalid pCAL after IDAT");
nuclear@26	1613 png_crc_finish(png_ptr, length);
nuclear@26	1614 return;
nuclear@26	1615 }
nuclear@26	1616 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
nuclear@26	1617 {
nuclear@26	1618 png_warning(png_ptr, "Duplicate pCAL chunk");
nuclear@26	1619 png_crc_finish(png_ptr, length);
nuclear@26	1620 return;
nuclear@26	1621 }
nuclear@26	1622
nuclear@26	1623 png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)\n",
nuclear@26	1624 length + 1);
nuclear@26	1625 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1626 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
nuclear@26	1627 if (png_ptr->chunkdata == NULL)
nuclear@26	1628 {
nuclear@26	1629 png_warning(png_ptr, "No memory for pCAL purpose.");
nuclear@26	1630 return;
nuclear@26	1631 }
nuclear@26	1632 slength = (png_size_t)length;
nuclear@26	1633 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
nuclear@26	1634
nuclear@26	1635 if (png_crc_finish(png_ptr, 0))
nuclear@26	1636 {
nuclear@26	1637 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1638 png_ptr->chunkdata = NULL;
nuclear@26	1639 return;
nuclear@26	1640 }
nuclear@26	1641
nuclear@26	1642 png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
nuclear@26	1643
nuclear@26	1644 png_debug(3, "Finding end of pCAL purpose string\n");
nuclear@26	1645 for (buf = png_ptr->chunkdata; *buf; buf++)
nuclear@26	1646 /* empty loop */ ;
nuclear@26	1647
nuclear@26	1648 endptr = png_ptr->chunkdata + slength;
nuclear@26	1649
nuclear@26	1650 /* We need to have at least 12 bytes after the purpose string
nuclear@26	1651 in order to get the parameter information. */
nuclear@26	1652 if (endptr <= buf + 12)
nuclear@26	1653 {
nuclear@26	1654 png_warning(png_ptr, "Invalid pCAL data");
nuclear@26	1655 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1656 png_ptr->chunkdata = NULL;
nuclear@26	1657 return;
nuclear@26	1658 }
nuclear@26	1659
nuclear@26	1660 png_debug(3, "Reading pCAL X0, X1, type, nparams, and units\n");
nuclear@26	1661 X0 = png_get_int_32((png_bytep)buf+1);
nuclear@26	1662 X1 = png_get_int_32((png_bytep)buf+5);
nuclear@26	1663 type = buf[9];
nuclear@26	1664 nparams = buf[10];
nuclear@26	1665 units = buf + 11;
nuclear@26	1666
nuclear@26	1667 png_debug(3, "Checking pCAL equation type and number of parameters\n");
nuclear@26	1668 /* Check that we have the right number of parameters for known
nuclear@26	1669 equation types. */
nuclear@26	1670 if ((type == PNG_EQUATION_LINEAR && nparams != 2) \|\|
nuclear@26	1671 (type == PNG_EQUATION_BASE_E && nparams != 3) \|\|
nuclear@26	1672 (type == PNG_EQUATION_ARBITRARY && nparams != 3) \|\|
nuclear@26	1673 (type == PNG_EQUATION_HYPERBOLIC && nparams != 4))
nuclear@26	1674 {
nuclear@26	1675 png_warning(png_ptr, "Invalid pCAL parameters for equation type");
nuclear@26	1676 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1677 png_ptr->chunkdata = NULL;
nuclear@26	1678 return;
nuclear@26	1679 }
nuclear@26	1680 else if (type >= PNG_EQUATION_LAST)
nuclear@26	1681 {
nuclear@26	1682 png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
nuclear@26	1683 }
nuclear@26	1684
nuclear@26	1685 for (buf = units; *buf; buf++)
nuclear@26	1686 /* Empty loop to move past the units string. */ ;
nuclear@26	1687
nuclear@26	1688 png_debug(3, "Allocating pCAL parameters array\n");
nuclear@26	1689 params = (png_charpp)png_malloc_warn(png_ptr,
nuclear@26	1690 (png_uint_32)(nparams * png_sizeof(png_charp))) ;
nuclear@26	1691 if (params == NULL)
nuclear@26	1692 {
nuclear@26	1693 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1694 png_ptr->chunkdata = NULL;
nuclear@26	1695 png_warning(png_ptr, "No memory for pCAL params.");
nuclear@26	1696 return;
nuclear@26	1697 }
nuclear@26	1698
nuclear@26	1699 /* Get pointers to the start of each parameter string. */
nuclear@26	1700 for (i = 0; i < (int)nparams; i++)
nuclear@26	1701 {
nuclear@26	1702 buf++; /* Skip the null string terminator from previous parameter. */
nuclear@26	1703
nuclear@26	1704 png_debug1(3, "Reading pCAL parameter %d\n", i);
nuclear@26	1705 for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++)
nuclear@26	1706 /* Empty loop to move past each parameter string */ ;
nuclear@26	1707
nuclear@26	1708 /* Make sure we haven't run out of data yet */
nuclear@26	1709 if (buf > endptr)
nuclear@26	1710 {
nuclear@26	1711 png_warning(png_ptr, "Invalid pCAL data");
nuclear@26	1712 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1713 png_ptr->chunkdata = NULL;
nuclear@26	1714 png_free(png_ptr, params);
nuclear@26	1715 return;
nuclear@26	1716 }
nuclear@26	1717 }
nuclear@26	1718
nuclear@26	1719 png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams,
nuclear@26	1720 units, params);
nuclear@26	1721
nuclear@26	1722 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1723 png_ptr->chunkdata = NULL;
nuclear@26	1724 png_free(png_ptr, params);
nuclear@26	1725 }
nuclear@26	1726 #endif
nuclear@26	1727
nuclear@26	1728 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@26	1729 /* read the sCAL chunk */
nuclear@26	1730 void /* PRIVATE */
nuclear@26	1731 png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1732 {
nuclear@26	1733 png_charp ep;
nuclear@26	1734 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	1735 double width, height;
nuclear@26	1736 png_charp vp;
nuclear@26	1737 #else
nuclear@26	1738 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	1739 png_charp swidth, sheight;
nuclear@26	1740 #endif
nuclear@26	1741 #endif
nuclear@26	1742 png_size_t slength;
nuclear@26	1743
nuclear@26	1744 png_debug(1, "in png_handle_sCAL\n");
nuclear@26	1745
nuclear@26	1746 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1747 png_error(png_ptr, "Missing IHDR before sCAL");
nuclear@26	1748 else if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1749 {
nuclear@26	1750 png_warning(png_ptr, "Invalid sCAL after IDAT");
nuclear@26	1751 png_crc_finish(png_ptr, length);
nuclear@26	1752 return;
nuclear@26	1753 }
nuclear@26	1754 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL))
nuclear@26	1755 {
nuclear@26	1756 png_warning(png_ptr, "Duplicate sCAL chunk");
nuclear@26	1757 png_crc_finish(png_ptr, length);
nuclear@26	1758 return;
nuclear@26	1759 }
nuclear@26	1760
nuclear@26	1761 png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)\n",
nuclear@26	1762 length + 1);
nuclear@26	1763 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
nuclear@26	1764 if (png_ptr->chunkdata == NULL)
nuclear@26	1765 {
nuclear@26	1766 png_warning(png_ptr, "Out of memory while processing sCAL chunk");
nuclear@26	1767 return;
nuclear@26	1768 }
nuclear@26	1769 slength = (png_size_t)length;
nuclear@26	1770 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
nuclear@26	1771
nuclear@26	1772 if (png_crc_finish(png_ptr, 0))
nuclear@26	1773 {
nuclear@26	1774 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1775 png_ptr->chunkdata = NULL;
nuclear@26	1776 return;
nuclear@26	1777 }
nuclear@26	1778
nuclear@26	1779 png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
nuclear@26	1780
nuclear@26	1781 ep = png_ptr->chunkdata + 1; /* skip unit byte */
nuclear@26	1782
nuclear@26	1783 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	1784 width = png_strtod(png_ptr, ep, &vp);
nuclear@26	1785 if (*vp)
nuclear@26	1786 {
nuclear@26	1787 png_warning(png_ptr, "malformed width string in sCAL chunk");
nuclear@26	1788 return;
nuclear@26	1789 }
nuclear@26	1790 #else
nuclear@26	1791 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	1792 swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
nuclear@26	1793 if (swidth == NULL)
nuclear@26	1794 {
nuclear@26	1795 png_warning(png_ptr, "Out of memory while processing sCAL chunk width");
nuclear@26	1796 return;
nuclear@26	1797 }
nuclear@26	1798 png_memcpy(swidth, ep, (png_size_t)png_strlen(ep));
nuclear@26	1799 #endif
nuclear@26	1800 #endif
nuclear@26	1801
nuclear@26	1802 for (ep = png_ptr->chunkdata; *ep; ep++)
nuclear@26	1803 /* empty loop */ ;
nuclear@26	1804 ep++;
nuclear@26	1805
nuclear@26	1806 if (png_ptr->chunkdata + slength < ep)
nuclear@26	1807 {
nuclear@26	1808 png_warning(png_ptr, "Truncated sCAL chunk");
nuclear@26	1809 #if defined(PNG_FIXED_POINT_SUPPORTED) && \
nuclear@26	1810 !defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26	1811 png_free(png_ptr, swidth);
nuclear@26	1812 #endif
nuclear@26	1813 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1814 png_ptr->chunkdata = NULL;
nuclear@26	1815 return;
nuclear@26	1816 }
nuclear@26	1817
nuclear@26	1818 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	1819 height = png_strtod(png_ptr, ep, &vp);
nuclear@26	1820 if (*vp)
nuclear@26	1821 {
nuclear@26	1822 png_warning(png_ptr, "malformed height string in sCAL chunk");
nuclear@26	1823 return;
nuclear@26	1824 }
nuclear@26	1825 #else
nuclear@26	1826 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	1827 sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
nuclear@26	1828 if (sheight == NULL)
nuclear@26	1829 {
nuclear@26	1830 png_warning(png_ptr, "Out of memory while processing sCAL chunk height");
nuclear@26	1831 return;
nuclear@26	1832 }
nuclear@26	1833 png_memcpy(sheight, ep, (png_size_t)png_strlen(ep));
nuclear@26	1834 #endif
nuclear@26	1835 #endif
nuclear@26	1836
nuclear@26	1837 if (png_ptr->chunkdata + slength < ep
nuclear@26	1838 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	1839 \|\| width <= 0. \|\| height <= 0.
nuclear@26	1840 #endif
nuclear@26	1841 )
nuclear@26	1842 {
nuclear@26	1843 png_warning(png_ptr, "Invalid sCAL data");
nuclear@26	1844 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1845 png_ptr->chunkdata = NULL;
nuclear@26	1846 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26	1847 png_free(png_ptr, swidth);
nuclear@26	1848 png_free(png_ptr, sheight);
nuclear@26	1849 #endif
nuclear@26	1850 return;
nuclear@26	1851 }
nuclear@26	1852
nuclear@26	1853
nuclear@26	1854 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26	1855 png_set_sCAL(png_ptr, info_ptr, png_ptr->chunkdata[0], width, height);
nuclear@26	1856 #else
nuclear@26	1857 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26	1858 png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], swidth, sheight);
nuclear@26	1859 #endif
nuclear@26	1860 #endif
nuclear@26	1861
nuclear@26	1862 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1863 png_ptr->chunkdata = NULL;
nuclear@26	1864 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26	1865 png_free(png_ptr, swidth);
nuclear@26	1866 png_free(png_ptr, sheight);
nuclear@26	1867 #endif
nuclear@26	1868 }
nuclear@26	1869 #endif
nuclear@26	1870
nuclear@26	1871 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@26	1872 void /* PRIVATE */
nuclear@26	1873 png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1874 {
nuclear@26	1875 png_byte buf[7];
nuclear@26	1876 png_time mod_time;
nuclear@26	1877
nuclear@26	1878 png_debug(1, "in png_handle_tIME\n");
nuclear@26	1879
nuclear@26	1880 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1881 png_error(png_ptr, "Out of place tIME chunk");
nuclear@26	1882 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME))
nuclear@26	1883 {
nuclear@26	1884 png_warning(png_ptr, "Duplicate tIME chunk");
nuclear@26	1885 png_crc_finish(png_ptr, length);
nuclear@26	1886 return;
nuclear@26	1887 }
nuclear@26	1888
nuclear@26	1889 if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1890 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	1891
nuclear@26	1892 if (length != 7)
nuclear@26	1893 {
nuclear@26	1894 png_warning(png_ptr, "Incorrect tIME chunk length");
nuclear@26	1895 png_crc_finish(png_ptr, length);
nuclear@26	1896 return;
nuclear@26	1897 }
nuclear@26	1898
nuclear@26	1899 png_crc_read(png_ptr, buf, 7);
nuclear@26	1900 if (png_crc_finish(png_ptr, 0))
nuclear@26	1901 return;
nuclear@26	1902
nuclear@26	1903 mod_time.second = buf[6];
nuclear@26	1904 mod_time.minute = buf[5];
nuclear@26	1905 mod_time.hour = buf[4];
nuclear@26	1906 mod_time.day = buf[3];
nuclear@26	1907 mod_time.month = buf[2];
nuclear@26	1908 mod_time.year = png_get_uint_16(buf);
nuclear@26	1909
nuclear@26	1910 png_set_tIME(png_ptr, info_ptr, &mod_time);
nuclear@26	1911 }
nuclear@26	1912 #endif
nuclear@26	1913
nuclear@26	1914 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@26	1915 /* Note: this does not properly handle chunks that are > 64K under DOS */
nuclear@26	1916 void /* PRIVATE */
nuclear@26	1917 png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	1918 {
nuclear@26	1919 png_textp text_ptr;
nuclear@26	1920 png_charp key;
nuclear@26	1921 png_charp text;
nuclear@26	1922 png_uint_32 skip = 0;
nuclear@26	1923 png_size_t slength;
nuclear@26	1924 int ret;
nuclear@26	1925
nuclear@26	1926 png_debug(1, "in png_handle_tEXt\n");
nuclear@26	1927
nuclear@26	1928 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	1929 png_error(png_ptr, "Missing IHDR before tEXt");
nuclear@26	1930
nuclear@26	1931 if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	1932 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	1933
nuclear@26	1934 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	1935 if (length > (png_uint_32)65535L)
nuclear@26	1936 {
nuclear@26	1937 png_warning(png_ptr, "tEXt chunk too large to fit in memory");
nuclear@26	1938 skip = length - (png_uint_32)65535L;
nuclear@26	1939 length = (png_uint_32)65535L;
nuclear@26	1940 }
nuclear@26	1941 #endif
nuclear@26	1942
nuclear@26	1943 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1944 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
nuclear@26	1945 if (png_ptr->chunkdata == NULL)
nuclear@26	1946 {
nuclear@26	1947 png_warning(png_ptr, "No memory to process text chunk.");
nuclear@26	1948 return;
nuclear@26	1949 }
nuclear@26	1950 slength = (png_size_t)length;
nuclear@26	1951 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
nuclear@26	1952
nuclear@26	1953 if (png_crc_finish(png_ptr, skip))
nuclear@26	1954 {
nuclear@26	1955 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1956 png_ptr->chunkdata = NULL;
nuclear@26	1957 return;
nuclear@26	1958 }
nuclear@26	1959
nuclear@26	1960 key = png_ptr->chunkdata;
nuclear@26	1961 key[slength] = 0x00;
nuclear@26	1962
nuclear@26	1963 for (text = key; *text; text++)
nuclear@26	1964 /* empty loop to find end of key */ ;
nuclear@26	1965
nuclear@26	1966 if (text != key + slength)
nuclear@26	1967 text++;
nuclear@26	1968
nuclear@26	1969 text_ptr = (png_textp)png_malloc_warn(png_ptr,
nuclear@26	1970 (png_uint_32)png_sizeof(png_text));
nuclear@26	1971 if (text_ptr == NULL)
nuclear@26	1972 {
nuclear@26	1973 png_warning(png_ptr, "Not enough memory to process text chunk.");
nuclear@26	1974 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1975 png_ptr->chunkdata = NULL;
nuclear@26	1976 return;
nuclear@26	1977 }
nuclear@26	1978 text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
nuclear@26	1979 text_ptr->key = key;
nuclear@26	1980 #ifdef PNG_iTXt_SUPPORTED
nuclear@26	1981 text_ptr->lang = NULL;
nuclear@26	1982 text_ptr->lang_key = NULL;
nuclear@26	1983 text_ptr->itxt_length = 0;
nuclear@26	1984 #endif
nuclear@26	1985 text_ptr->text = text;
nuclear@26	1986 text_ptr->text_length = png_strlen(text);
nuclear@26	1987
nuclear@26	1988 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@26	1989
nuclear@26	1990 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	1991 png_ptr->chunkdata = NULL;
nuclear@26	1992 png_free(png_ptr, text_ptr);
nuclear@26	1993 if (ret)
nuclear@26	1994 png_warning(png_ptr, "Insufficient memory to process text chunk.");
nuclear@26	1995 }
nuclear@26	1996 #endif
nuclear@26	1997
nuclear@26	1998 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@26	1999 /* note: this does not correctly handle chunks that are > 64K under DOS */
nuclear@26	2000 void /* PRIVATE */
nuclear@26	2001 png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	2002 {
nuclear@26	2003 png_textp text_ptr;
nuclear@26	2004 png_charp text;
nuclear@26	2005 int comp_type;
nuclear@26	2006 int ret;
nuclear@26	2007 png_size_t slength, prefix_len, data_len;
nuclear@26	2008
nuclear@26	2009 png_debug(1, "in png_handle_zTXt\n");
nuclear@26	2010 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	2011 png_error(png_ptr, "Missing IHDR before zTXt");
nuclear@26	2012
nuclear@26	2013 if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	2014 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	2015
nuclear@26	2016 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	2017 /* We will no doubt have problems with chunks even half this size, but
nuclear@26	2018 there is no hard and fast rule to tell us where to stop. */
nuclear@26	2019 if (length > (png_uint_32)65535L)
nuclear@26	2020 {
nuclear@26	2021 png_warning(png_ptr, "zTXt chunk too large to fit in memory");
nuclear@26	2022 png_crc_finish(png_ptr, length);
nuclear@26	2023 return;
nuclear@26	2024 }
nuclear@26	2025 #endif
nuclear@26	2026
nuclear@26	2027 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2028 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
nuclear@26	2029 if (png_ptr->chunkdata == NULL)
nuclear@26	2030 {
nuclear@26	2031 png_warning(png_ptr, "Out of memory processing zTXt chunk.");
nuclear@26	2032 return;
nuclear@26	2033 }
nuclear@26	2034 slength = (png_size_t)length;
nuclear@26	2035 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
nuclear@26	2036 if (png_crc_finish(png_ptr, 0))
nuclear@26	2037 {
nuclear@26	2038 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2039 png_ptr->chunkdata = NULL;
nuclear@26	2040 return;
nuclear@26	2041 }
nuclear@26	2042
nuclear@26	2043 png_ptr->chunkdata[slength] = 0x00;
nuclear@26	2044
nuclear@26	2045 for (text = png_ptr->chunkdata; *text; text++)
nuclear@26	2046 /* empty loop */ ;
nuclear@26	2047
nuclear@26	2048 /* zTXt must have some text after the chunkdataword */
nuclear@26	2049 if (text >= png_ptr->chunkdata + slength - 2)
nuclear@26	2050 {
nuclear@26	2051 png_warning(png_ptr, "Truncated zTXt chunk");
nuclear@26	2052 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2053 png_ptr->chunkdata = NULL;
nuclear@26	2054 return;
nuclear@26	2055 }
nuclear@26	2056 else
nuclear@26	2057 {
nuclear@26	2058 comp_type = *(++text);
nuclear@26	2059 if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
nuclear@26	2060 {
nuclear@26	2061 png_warning(png_ptr, "Unknown compression type in zTXt chunk");
nuclear@26	2062 comp_type = PNG_TEXT_COMPRESSION_zTXt;
nuclear@26	2063 }
nuclear@26	2064 text++; /* skip the compression_method byte */
nuclear@26	2065 }
nuclear@26	2066 prefix_len = text - png_ptr->chunkdata;
nuclear@26	2067
nuclear@26	2068 png_decompress_chunk(png_ptr, comp_type,
nuclear@26	2069 (png_size_t)length, prefix_len, &data_len);
nuclear@26	2070
nuclear@26	2071 text_ptr = (png_textp)png_malloc_warn(png_ptr,
nuclear@26	2072 (png_uint_32)png_sizeof(png_text));
nuclear@26	2073 if (text_ptr == NULL)
nuclear@26	2074 {
nuclear@26	2075 png_warning(png_ptr, "Not enough memory to process zTXt chunk.");
nuclear@26	2076 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2077 png_ptr->chunkdata = NULL;
nuclear@26	2078 return;
nuclear@26	2079 }
nuclear@26	2080 text_ptr->compression = comp_type;
nuclear@26	2081 text_ptr->key = png_ptr->chunkdata;
nuclear@26	2082 #ifdef PNG_iTXt_SUPPORTED
nuclear@26	2083 text_ptr->lang = NULL;
nuclear@26	2084 text_ptr->lang_key = NULL;
nuclear@26	2085 text_ptr->itxt_length = 0;
nuclear@26	2086 #endif
nuclear@26	2087 text_ptr->text = png_ptr->chunkdata + prefix_len;
nuclear@26	2088 text_ptr->text_length = data_len;
nuclear@26	2089
nuclear@26	2090 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@26	2091
nuclear@26	2092 png_free(png_ptr, text_ptr);
nuclear@26	2093 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2094 png_ptr->chunkdata = NULL;
nuclear@26	2095 if (ret)
nuclear@26	2096 png_error(png_ptr, "Insufficient memory to store zTXt chunk.");
nuclear@26	2097 }
nuclear@26	2098 #endif
nuclear@26	2099
nuclear@26	2100 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@26	2101 /* note: this does not correctly handle chunks that are > 64K under DOS */
nuclear@26	2102 void /* PRIVATE */
nuclear@26	2103 png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	2104 {
nuclear@26	2105 png_textp text_ptr;
nuclear@26	2106 png_charp key, lang, text, lang_key;
nuclear@26	2107 int comp_flag;
nuclear@26	2108 int comp_type = 0;
nuclear@26	2109 int ret;
nuclear@26	2110 png_size_t slength, prefix_len, data_len;
nuclear@26	2111
nuclear@26	2112 png_debug(1, "in png_handle_iTXt\n");
nuclear@26	2113
nuclear@26	2114 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@26	2115 png_error(png_ptr, "Missing IHDR before iTXt");
nuclear@26	2116
nuclear@26	2117 if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	2118 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	2119
nuclear@26	2120 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	2121 /* We will no doubt have problems with chunks even half this size, but
nuclear@26	2122 there is no hard and fast rule to tell us where to stop. */
nuclear@26	2123 if (length > (png_uint_32)65535L)
nuclear@26	2124 {
nuclear@26	2125 png_warning(png_ptr, "iTXt chunk too large to fit in memory");
nuclear@26	2126 png_crc_finish(png_ptr, length);
nuclear@26	2127 return;
nuclear@26	2128 }
nuclear@26	2129 #endif
nuclear@26	2130
nuclear@26	2131 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2132 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
nuclear@26	2133 if (png_ptr->chunkdata == NULL)
nuclear@26	2134 {
nuclear@26	2135 png_warning(png_ptr, "No memory to process iTXt chunk.");
nuclear@26	2136 return;
nuclear@26	2137 }
nuclear@26	2138 slength = (png_size_t)length;
nuclear@26	2139 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
nuclear@26	2140 if (png_crc_finish(png_ptr, 0))
nuclear@26	2141 {
nuclear@26	2142 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2143 png_ptr->chunkdata = NULL;
nuclear@26	2144 return;
nuclear@26	2145 }
nuclear@26	2146
nuclear@26	2147 png_ptr->chunkdata[slength] = 0x00;
nuclear@26	2148
nuclear@26	2149 for (lang = png_ptr->chunkdata; *lang; lang++)
nuclear@26	2150 /* empty loop */ ;
nuclear@26	2151 lang++; /* skip NUL separator */
nuclear@26	2152
nuclear@26	2153 /* iTXt must have a language tag (possibly empty), two compression bytes,
nuclear@26	2154 translated keyword (possibly empty), and possibly some text after the
nuclear@26	2155 keyword */
nuclear@26	2156
nuclear@26	2157 if (lang >= png_ptr->chunkdata + slength - 3)
nuclear@26	2158 {
nuclear@26	2159 png_warning(png_ptr, "Truncated iTXt chunk");
nuclear@26	2160 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2161 png_ptr->chunkdata = NULL;
nuclear@26	2162 return;
nuclear@26	2163 }
nuclear@26	2164 else
nuclear@26	2165 {
nuclear@26	2166 comp_flag = *lang++;
nuclear@26	2167 comp_type = *lang++;
nuclear@26	2168 }
nuclear@26	2169
nuclear@26	2170 for (lang_key = lang; *lang_key; lang_key++)
nuclear@26	2171 /* empty loop */ ;
nuclear@26	2172 lang_key++; /* skip NUL separator */
nuclear@26	2173
nuclear@26	2174 if (lang_key >= png_ptr->chunkdata + slength)
nuclear@26	2175 {
nuclear@26	2176 png_warning(png_ptr, "Truncated iTXt chunk");
nuclear@26	2177 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2178 png_ptr->chunkdata = NULL;
nuclear@26	2179 return;
nuclear@26	2180 }
nuclear@26	2181
nuclear@26	2182 for (text = lang_key; *text; text++)
nuclear@26	2183 /* empty loop */ ;
nuclear@26	2184 text++; /* skip NUL separator */
nuclear@26	2185 if (text >= png_ptr->chunkdata + slength)
nuclear@26	2186 {
nuclear@26	2187 png_warning(png_ptr, "Malformed iTXt chunk");
nuclear@26	2188 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2189 png_ptr->chunkdata = NULL;
nuclear@26	2190 return;
nuclear@26	2191 }
nuclear@26	2192
nuclear@26	2193 prefix_len = text - png_ptr->chunkdata;
nuclear@26	2194
nuclear@26	2195 key=png_ptr->chunkdata;
nuclear@26	2196 if (comp_flag)
nuclear@26	2197 png_decompress_chunk(png_ptr, comp_type,
nuclear@26	2198 (size_t)length, prefix_len, &data_len);
nuclear@26	2199 else
nuclear@26	2200 data_len = png_strlen(png_ptr->chunkdata + prefix_len);
nuclear@26	2201 text_ptr = (png_textp)png_malloc_warn(png_ptr,
nuclear@26	2202 (png_uint_32)png_sizeof(png_text));
nuclear@26	2203 if (text_ptr == NULL)
nuclear@26	2204 {
nuclear@26	2205 png_warning(png_ptr, "Not enough memory to process iTXt chunk.");
nuclear@26	2206 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2207 png_ptr->chunkdata = NULL;
nuclear@26	2208 return;
nuclear@26	2209 }
nuclear@26	2210 text_ptr->compression = (int)comp_flag + 1;
nuclear@26	2211 text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key);
nuclear@26	2212 text_ptr->lang = png_ptr->chunkdata + (lang - key);
nuclear@26	2213 text_ptr->itxt_length = data_len;
nuclear@26	2214 text_ptr->text_length = 0;
nuclear@26	2215 text_ptr->key = png_ptr->chunkdata;
nuclear@26	2216 text_ptr->text = png_ptr->chunkdata + prefix_len;
nuclear@26	2217
nuclear@26	2218 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@26	2219
nuclear@26	2220 png_free(png_ptr, text_ptr);
nuclear@26	2221 png_free(png_ptr, png_ptr->chunkdata);
nuclear@26	2222 png_ptr->chunkdata = NULL;
nuclear@26	2223 if (ret)
nuclear@26	2224 png_error(png_ptr, "Insufficient memory to store iTXt chunk.");
nuclear@26	2225 }
nuclear@26	2226 #endif
nuclear@26	2227
nuclear@26	2228 /* This function is called when we haven't found a handler for a
nuclear@26	2229 chunk. If there isn't a problem with the chunk itself (ie bad
nuclear@26	2230 chunk name, CRC, or a critical chunk), the chunk is silently ignored
nuclear@26	2231 -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which
nuclear@26	2232 case it will be saved away to be written out later. */
nuclear@26	2233 void /* PRIVATE */
nuclear@26	2234 png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
nuclear@26	2235 {
nuclear@26	2236 png_uint_32 skip = 0;
nuclear@26	2237
nuclear@26	2238 png_debug(1, "in png_handle_unknown\n");
nuclear@26	2239
nuclear@26	2240 if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@26	2241 {
nuclear@26	2242 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@26	2243 PNG_CONST PNG_IDAT;
nuclear@26	2244 #endif
nuclear@26	2245 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */
nuclear@26	2246 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	2247 }
nuclear@26	2248
nuclear@26	2249 if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@26	2250 {
nuclear@26	2251 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26	2252 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@26	2253 PNG_HANDLE_CHUNK_ALWAYS
nuclear@26	2254 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@26	2255 && png_ptr->read_user_chunk_fn == NULL
nuclear@26	2256 #endif
nuclear@26	2257 )
nuclear@26	2258 #endif
nuclear@26	2259 png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@26	2260 }
nuclear@26	2261
nuclear@26	2262 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26	2263 if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) \|\|
nuclear@26	2264 (png_ptr->read_user_chunk_fn != NULL))
nuclear@26	2265 {
nuclear@26	2266 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	2267 if (length > (png_uint_32)65535L)
nuclear@26	2268 {
nuclear@26	2269 png_warning(png_ptr, "unknown chunk too large to fit in memory");
nuclear@26	2270 skip = length - (png_uint_32)65535L;
nuclear@26	2271 length = (png_uint_32)65535L;
nuclear@26	2272 }
nuclear@26	2273 #endif
nuclear@26	2274 png_memcpy((png_charp)png_ptr->unknown_chunk.name,
nuclear@26	2275 (png_charp)png_ptr->chunk_name,
nuclear@26	2276 png_sizeof(png_ptr->unknown_chunk.name));
nuclear@26	2277 png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] = '\0';
nuclear@26	2278 png_ptr->unknown_chunk.size = (png_size_t)length;
nuclear@26	2279 if (length == 0)
nuclear@26	2280 png_ptr->unknown_chunk.data = NULL;
nuclear@26	2281 else
nuclear@26	2282 {
nuclear@26	2283 png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
nuclear@26	2284 png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
nuclear@26	2285 }
nuclear@26	2286 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@26	2287 if (png_ptr->read_user_chunk_fn != NULL)
nuclear@26	2288 {
nuclear@26	2289 /* callback to user unknown chunk handler */
nuclear@26	2290 int ret;
nuclear@26	2291 ret = (*(png_ptr->read_user_chunk_fn))
nuclear@26	2292 (png_ptr, &png_ptr->unknown_chunk);
nuclear@26	2293 if (ret < 0)
nuclear@26	2294 png_chunk_error(png_ptr, "error in user chunk");
nuclear@26	2295 if (ret == 0)
nuclear@26	2296 {
nuclear@26	2297 if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@26	2298 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@26	2299 PNG_HANDLE_CHUNK_ALWAYS)
nuclear@26	2300 png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@26	2301 png_set_unknown_chunks(png_ptr, info_ptr,
nuclear@26	2302 &png_ptr->unknown_chunk, 1);
nuclear@26	2303 }
nuclear@26	2304 }
nuclear@26	2305 else
nuclear@26	2306 #endif
nuclear@26	2307 png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
nuclear@26	2308 png_free(png_ptr, png_ptr->unknown_chunk.data);
nuclear@26	2309 png_ptr->unknown_chunk.data = NULL;
nuclear@26	2310 }
nuclear@26	2311 else
nuclear@26	2312 #endif
nuclear@26	2313 skip = length;
nuclear@26	2314
nuclear@26	2315 png_crc_finish(png_ptr, skip);
nuclear@26	2316
nuclear@26	2317 #if !defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@26	2318 info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
nuclear@26	2319 #endif
nuclear@26	2320 }
nuclear@26	2321
nuclear@26	2322 /* This function is called to verify that a chunk name is valid.
nuclear@26	2323 This function can't have the "critical chunk check" incorporated
nuclear@26	2324 into it, since in the future we will need to be able to call user
nuclear@26	2325 functions to handle unknown critical chunks after we check that
nuclear@26	2326 the chunk name itself is valid. */
nuclear@26	2327
nuclear@26	2328 #define isnonalpha(c) ((c) < 65 \|\| (c) > 122 \|\| ((c) > 90 && (c) < 97))
nuclear@26	2329
nuclear@26	2330 void /* PRIVATE */
nuclear@26	2331 png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
nuclear@26	2332 {
nuclear@26	2333 png_debug(1, "in png_check_chunk_name\n");
nuclear@26	2334 if (isnonalpha(chunk_name[0]) \|\| isnonalpha(chunk_name[1]) \|\|
nuclear@26	2335 isnonalpha(chunk_name[2]) \|\| isnonalpha(chunk_name[3]))
nuclear@26	2336 {
nuclear@26	2337 png_chunk_error(png_ptr, "invalid chunk type");
nuclear@26	2338 }
nuclear@26	2339 }
nuclear@26	2340
nuclear@26	2341 /* Combines the row recently read in with the existing pixels in the
nuclear@26	2342 row. This routine takes care of alpha and transparency if requested.
nuclear@26	2343 This routine also handles the two methods of progressive display
nuclear@26	2344 of interlaced images, depending on the mask value.
nuclear@26	2345 The mask value describes which pixels are to be combined with
nuclear@26	2346 the row. The pattern always repeats every 8 pixels, so just 8
nuclear@26	2347 bits are needed. A one indicates the pixel is to be combined,
nuclear@26	2348 a zero indicates the pixel is to be skipped. This is in addition
nuclear@26	2349 to any alpha or transparency value associated with the pixel. If
nuclear@26	2350 you want all pixels to be combined, pass 0xff (255) in mask. */
nuclear@26	2351
nuclear@26	2352 void /* PRIVATE */
nuclear@26	2353 png_combine_row(png_structp png_ptr, png_bytep row, int mask)
nuclear@26	2354 {
nuclear@26	2355 png_debug(1, "in png_combine_row\n");
nuclear@26	2356 if (mask == 0xff)
nuclear@26	2357 {
nuclear@26	2358 png_memcpy(row, png_ptr->row_buf + 1,
nuclear@26	2359 PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width));
nuclear@26	2360 }
nuclear@26	2361 else
nuclear@26	2362 {
nuclear@26	2363 switch (png_ptr->row_info.pixel_depth)
nuclear@26	2364 {
nuclear@26	2365 case 1:
nuclear@26	2366 {
nuclear@26	2367 png_bytep sp = png_ptr->row_buf + 1;
nuclear@26	2368 png_bytep dp = row;
nuclear@26	2369 int s_inc, s_start, s_end;
nuclear@26	2370 int m = 0x80;
nuclear@26	2371 int shift;
nuclear@26	2372 png_uint_32 i;
nuclear@26	2373 png_uint_32 row_width = png_ptr->width;
nuclear@26	2374
nuclear@26	2375 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26	2376 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@26	2377 {
nuclear@26	2378 s_start = 0;
nuclear@26	2379 s_end = 7;
nuclear@26	2380 s_inc = 1;
nuclear@26	2381 }
nuclear@26	2382 else
nuclear@26	2383 #endif
nuclear@26	2384 {
nuclear@26	2385 s_start = 7;
nuclear@26	2386 s_end = 0;
nuclear@26	2387 s_inc = -1;
nuclear@26	2388 }
nuclear@26	2389
nuclear@26	2390 shift = s_start;
nuclear@26	2391
nuclear@26	2392 for (i = 0; i < row_width; i++)
nuclear@26	2393 {
nuclear@26	2394 if (m & mask)
nuclear@26	2395 {
nuclear@26	2396 int value;
nuclear@26	2397
nuclear@26	2398 value = (*sp >> shift) & 0x01;
nuclear@26	2399 *dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
nuclear@26	2400 *dp \|= (png_byte)(value << shift);
nuclear@26	2401 }
nuclear@26	2402
nuclear@26	2403 if (shift == s_end)
nuclear@26	2404 {
nuclear@26	2405 shift = s_start;
nuclear@26	2406 sp++;
nuclear@26	2407 dp++;
nuclear@26	2408 }
nuclear@26	2409 else
nuclear@26	2410 shift += s_inc;
nuclear@26	2411
nuclear@26	2412 if (m == 1)
nuclear@26	2413 m = 0x80;
nuclear@26	2414 else
nuclear@26	2415 m >>= 1;
nuclear@26	2416 }
nuclear@26	2417 break;
nuclear@26	2418 }
nuclear@26	2419 case 2:
nuclear@26	2420 {
nuclear@26	2421 png_bytep sp = png_ptr->row_buf + 1;
nuclear@26	2422 png_bytep dp = row;
nuclear@26	2423 int s_start, s_end, s_inc;
nuclear@26	2424 int m = 0x80;
nuclear@26	2425 int shift;
nuclear@26	2426 png_uint_32 i;
nuclear@26	2427 png_uint_32 row_width = png_ptr->width;
nuclear@26	2428 int value;
nuclear@26	2429
nuclear@26	2430 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26	2431 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@26	2432 {
nuclear@26	2433 s_start = 0;
nuclear@26	2434 s_end = 6;
nuclear@26	2435 s_inc = 2;
nuclear@26	2436 }
nuclear@26	2437 else
nuclear@26	2438 #endif
nuclear@26	2439 {
nuclear@26	2440 s_start = 6;
nuclear@26	2441 s_end = 0;
nuclear@26	2442 s_inc = -2;
nuclear@26	2443 }
nuclear@26	2444
nuclear@26	2445 shift = s_start;
nuclear@26	2446
nuclear@26	2447 for (i = 0; i < row_width; i++)
nuclear@26	2448 {
nuclear@26	2449 if (m & mask)
nuclear@26	2450 {
nuclear@26	2451 value = (*sp >> shift) & 0x03;
nuclear@26	2452 *dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
nuclear@26	2453 *dp \|= (png_byte)(value << shift);
nuclear@26	2454 }
nuclear@26	2455
nuclear@26	2456 if (shift == s_end)
nuclear@26	2457 {
nuclear@26	2458 shift = s_start;
nuclear@26	2459 sp++;
nuclear@26	2460 dp++;
nuclear@26	2461 }
nuclear@26	2462 else
nuclear@26	2463 shift += s_inc;
nuclear@26	2464 if (m == 1)
nuclear@26	2465 m = 0x80;
nuclear@26	2466 else
nuclear@26	2467 m >>= 1;
nuclear@26	2468 }
nuclear@26	2469 break;
nuclear@26	2470 }
nuclear@26	2471 case 4:
nuclear@26	2472 {
nuclear@26	2473 png_bytep sp = png_ptr->row_buf + 1;
nuclear@26	2474 png_bytep dp = row;
nuclear@26	2475 int s_start, s_end, s_inc;
nuclear@26	2476 int m = 0x80;
nuclear@26	2477 int shift;
nuclear@26	2478 png_uint_32 i;
nuclear@26	2479 png_uint_32 row_width = png_ptr->width;
nuclear@26	2480 int value;
nuclear@26	2481
nuclear@26	2482 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26	2483 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@26	2484 {
nuclear@26	2485 s_start = 0;
nuclear@26	2486 s_end = 4;
nuclear@26	2487 s_inc = 4;
nuclear@26	2488 }
nuclear@26	2489 else
nuclear@26	2490 #endif
nuclear@26	2491 {
nuclear@26	2492 s_start = 4;
nuclear@26	2493 s_end = 0;
nuclear@26	2494 s_inc = -4;
nuclear@26	2495 }
nuclear@26	2496 shift = s_start;
nuclear@26	2497
nuclear@26	2498 for (i = 0; i < row_width; i++)
nuclear@26	2499 {
nuclear@26	2500 if (m & mask)
nuclear@26	2501 {
nuclear@26	2502 value = (*sp >> shift) & 0xf;
nuclear@26	2503 *dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
nuclear@26	2504 *dp \|= (png_byte)(value << shift);
nuclear@26	2505 }
nuclear@26	2506
nuclear@26	2507 if (shift == s_end)
nuclear@26	2508 {
nuclear@26	2509 shift = s_start;
nuclear@26	2510 sp++;
nuclear@26	2511 dp++;
nuclear@26	2512 }
nuclear@26	2513 else
nuclear@26	2514 shift += s_inc;
nuclear@26	2515 if (m == 1)
nuclear@26	2516 m = 0x80;
nuclear@26	2517 else
nuclear@26	2518 m >>= 1;
nuclear@26	2519 }
nuclear@26	2520 break;
nuclear@26	2521 }
nuclear@26	2522 default:
nuclear@26	2523 {
nuclear@26	2524 png_bytep sp = png_ptr->row_buf + 1;
nuclear@26	2525 png_bytep dp = row;
nuclear@26	2526 png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
nuclear@26	2527 png_uint_32 i;
nuclear@26	2528 png_uint_32 row_width = png_ptr->width;
nuclear@26	2529 png_byte m = 0x80;
nuclear@26	2530
nuclear@26	2531
nuclear@26	2532 for (i = 0; i < row_width; i++)
nuclear@26	2533 {
nuclear@26	2534 if (m & mask)
nuclear@26	2535 {
nuclear@26	2536 png_memcpy(dp, sp, pixel_bytes);
nuclear@26	2537 }
nuclear@26	2538
nuclear@26	2539 sp += pixel_bytes;
nuclear@26	2540 dp += pixel_bytes;
nuclear@26	2541
nuclear@26	2542 if (m == 1)
nuclear@26	2543 m = 0x80;
nuclear@26	2544 else
nuclear@26	2545 m >>= 1;
nuclear@26	2546 }
nuclear@26	2547 break;
nuclear@26	2548 }
nuclear@26	2549 }
nuclear@26	2550 }
nuclear@26	2551 }
nuclear@26	2552
nuclear@26	2553 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@26	2554 /* OLD pre-1.0.9 interface:
nuclear@26	2555 void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
nuclear@26	2556 png_uint_32 transformations)
nuclear@26	2557 */
nuclear@26	2558 void /* PRIVATE */
nuclear@26	2559 png_do_read_interlace(png_structp png_ptr)
nuclear@26	2560 {
nuclear@26	2561 png_row_infop row_info = &(png_ptr->row_info);
nuclear@26	2562 png_bytep row = png_ptr->row_buf + 1;
nuclear@26	2563 int pass = png_ptr->pass;
nuclear@26	2564 png_uint_32 transformations = png_ptr->transformations;
nuclear@26	2565 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@26	2566 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
nuclear@26	2567 /* offset to next interlace block */
nuclear@26	2568 PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
nuclear@26	2569 #endif
nuclear@26	2570
nuclear@26	2571 png_debug(1, "in png_do_read_interlace\n");
nuclear@26	2572 if (row != NULL && row_info != NULL)
nuclear@26	2573 {
nuclear@26	2574 png_uint_32 final_width;
nuclear@26	2575
nuclear@26	2576 final_width = row_info->width * png_pass_inc[pass];
nuclear@26	2577
nuclear@26	2578 switch (row_info->pixel_depth)
nuclear@26	2579 {
nuclear@26	2580 case 1:
nuclear@26	2581 {
nuclear@26	2582 png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
nuclear@26	2583 png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
nuclear@26	2584 int sshift, dshift;
nuclear@26	2585 int s_start, s_end, s_inc;
nuclear@26	2586 int jstop = png_pass_inc[pass];
nuclear@26	2587 png_byte v;
nuclear@26	2588 png_uint_32 i;
nuclear@26	2589 int j;
nuclear@26	2590
nuclear@26	2591 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26	2592 if (transformations & PNG_PACKSWAP)
nuclear@26	2593 {
nuclear@26	2594 sshift = (int)((row_info->width + 7) & 0x07);
nuclear@26	2595 dshift = (int)((final_width + 7) & 0x07);
nuclear@26	2596 s_start = 7;
nuclear@26	2597 s_end = 0;
nuclear@26	2598 s_inc = -1;
nuclear@26	2599 }
nuclear@26	2600 else
nuclear@26	2601 #endif
nuclear@26	2602 {
nuclear@26	2603 sshift = 7 - (int)((row_info->width + 7) & 0x07);
nuclear@26	2604 dshift = 7 - (int)((final_width + 7) & 0x07);
nuclear@26	2605 s_start = 0;
nuclear@26	2606 s_end = 7;
nuclear@26	2607 s_inc = 1;
nuclear@26	2608 }
nuclear@26	2609
nuclear@26	2610 for (i = 0; i < row_info->width; i++)
nuclear@26	2611 {
nuclear@26	2612 v = (png_byte)((*sp >> sshift) & 0x01);
nuclear@26	2613 for (j = 0; j < jstop; j++)
nuclear@26	2614 {
nuclear@26	2615 *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
nuclear@26	2616 *dp \|= (png_byte)(v << dshift);
nuclear@26	2617 if (dshift == s_end)
nuclear@26	2618 {
nuclear@26	2619 dshift = s_start;
nuclear@26	2620 dp--;
nuclear@26	2621 }
nuclear@26	2622 else
nuclear@26	2623 dshift += s_inc;
nuclear@26	2624 }
nuclear@26	2625 if (sshift == s_end)
nuclear@26	2626 {
nuclear@26	2627 sshift = s_start;
nuclear@26	2628 sp--;
nuclear@26	2629 }
nuclear@26	2630 else
nuclear@26	2631 sshift += s_inc;
nuclear@26	2632 }
nuclear@26	2633 break;
nuclear@26	2634 }
nuclear@26	2635 case 2:
nuclear@26	2636 {
nuclear@26	2637 png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
nuclear@26	2638 png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
nuclear@26	2639 int sshift, dshift;
nuclear@26	2640 int s_start, s_end, s_inc;
nuclear@26	2641 int jstop = png_pass_inc[pass];
nuclear@26	2642 png_uint_32 i;
nuclear@26	2643
nuclear@26	2644 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26	2645 if (transformations & PNG_PACKSWAP)
nuclear@26	2646 {
nuclear@26	2647 sshift = (int)(((row_info->width + 3) & 0x03) << 1);
nuclear@26	2648 dshift = (int)(((final_width + 3) & 0x03) << 1);
nuclear@26	2649 s_start = 6;
nuclear@26	2650 s_end = 0;
nuclear@26	2651 s_inc = -2;
nuclear@26	2652 }
nuclear@26	2653 else
nuclear@26	2654 #endif
nuclear@26	2655 {
nuclear@26	2656 sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
nuclear@26	2657 dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
nuclear@26	2658 s_start = 0;
nuclear@26	2659 s_end = 6;
nuclear@26	2660 s_inc = 2;
nuclear@26	2661 }
nuclear@26	2662
nuclear@26	2663 for (i = 0; i < row_info->width; i++)
nuclear@26	2664 {
nuclear@26	2665 png_byte v;
nuclear@26	2666 int j;
nuclear@26	2667
nuclear@26	2668 v = (png_byte)((*sp >> sshift) & 0x03);
nuclear@26	2669 for (j = 0; j < jstop; j++)
nuclear@26	2670 {
nuclear@26	2671 *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
nuclear@26	2672 *dp \|= (png_byte)(v << dshift);
nuclear@26	2673 if (dshift == s_end)
nuclear@26	2674 {
nuclear@26	2675 dshift = s_start;
nuclear@26	2676 dp--;
nuclear@26	2677 }
nuclear@26	2678 else
nuclear@26	2679 dshift += s_inc;
nuclear@26	2680 }
nuclear@26	2681 if (sshift == s_end)
nuclear@26	2682 {
nuclear@26	2683 sshift = s_start;
nuclear@26	2684 sp--;
nuclear@26	2685 }
nuclear@26	2686 else
nuclear@26	2687 sshift += s_inc;
nuclear@26	2688 }
nuclear@26	2689 break;
nuclear@26	2690 }
nuclear@26	2691 case 4:
nuclear@26	2692 {
nuclear@26	2693 png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
nuclear@26	2694 png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
nuclear@26	2695 int sshift, dshift;
nuclear@26	2696 int s_start, s_end, s_inc;
nuclear@26	2697 png_uint_32 i;
nuclear@26	2698 int jstop = png_pass_inc[pass];
nuclear@26	2699
nuclear@26	2700 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26	2701 if (transformations & PNG_PACKSWAP)
nuclear@26	2702 {
nuclear@26	2703 sshift = (int)(((row_info->width + 1) & 0x01) << 2);
nuclear@26	2704 dshift = (int)(((final_width + 1) & 0x01) << 2);
nuclear@26	2705 s_start = 4;
nuclear@26	2706 s_end = 0;
nuclear@26	2707 s_inc = -4;
nuclear@26	2708 }
nuclear@26	2709 else
nuclear@26	2710 #endif
nuclear@26	2711 {
nuclear@26	2712 sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
nuclear@26	2713 dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
nuclear@26	2714 s_start = 0;
nuclear@26	2715 s_end = 4;
nuclear@26	2716 s_inc = 4;
nuclear@26	2717 }
nuclear@26	2718
nuclear@26	2719 for (i = 0; i < row_info->width; i++)
nuclear@26	2720 {
nuclear@26	2721 png_byte v = (png_byte)((*sp >> sshift) & 0xf);
nuclear@26	2722 int j;
nuclear@26	2723
nuclear@26	2724 for (j = 0; j < jstop; j++)
nuclear@26	2725 {
nuclear@26	2726 *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff);
nuclear@26	2727 *dp \|= (png_byte)(v << dshift);
nuclear@26	2728 if (dshift == s_end)
nuclear@26	2729 {
nuclear@26	2730 dshift = s_start;
nuclear@26	2731 dp--;
nuclear@26	2732 }
nuclear@26	2733 else
nuclear@26	2734 dshift += s_inc;
nuclear@26	2735 }
nuclear@26	2736 if (sshift == s_end)
nuclear@26	2737 {
nuclear@26	2738 sshift = s_start;
nuclear@26	2739 sp--;
nuclear@26	2740 }
nuclear@26	2741 else
nuclear@26	2742 sshift += s_inc;
nuclear@26	2743 }
nuclear@26	2744 break;
nuclear@26	2745 }
nuclear@26	2746 default:
nuclear@26	2747 {
nuclear@26	2748 png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
nuclear@26	2749 png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
nuclear@26	2750 png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
nuclear@26	2751
nuclear@26	2752 int jstop = png_pass_inc[pass];
nuclear@26	2753 png_uint_32 i;
nuclear@26	2754
nuclear@26	2755 for (i = 0; i < row_info->width; i++)
nuclear@26	2756 {
nuclear@26	2757 png_byte v[8];
nuclear@26	2758 int j;
nuclear@26	2759
nuclear@26	2760 png_memcpy(v, sp, pixel_bytes);
nuclear@26	2761 for (j = 0; j < jstop; j++)
nuclear@26	2762 {
nuclear@26	2763 png_memcpy(dp, v, pixel_bytes);
nuclear@26	2764 dp -= pixel_bytes;
nuclear@26	2765 }
nuclear@26	2766 sp -= pixel_bytes;
nuclear@26	2767 }
nuclear@26	2768 break;
nuclear@26	2769 }
nuclear@26	2770 }
nuclear@26	2771 row_info->width = final_width;
nuclear@26	2772 row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
nuclear@26	2773 }
nuclear@26	2774 #if !defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26	2775 transformations = transformations; /* silence compiler warning */
nuclear@26	2776 #endif
nuclear@26	2777 }
nuclear@26	2778 #endif /* PNG_READ_INTERLACING_SUPPORTED */
nuclear@26	2779
nuclear@26	2780 void /* PRIVATE */
nuclear@26	2781 png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
nuclear@26	2782 png_bytep prev_row, int filter)
nuclear@26	2783 {
nuclear@26	2784 png_debug(1, "in png_read_filter_row\n");
nuclear@26	2785 png_debug2(2, "row = %lu, filter = %d\n", png_ptr->row_number, filter);
nuclear@26	2786 switch (filter)
nuclear@26	2787 {
nuclear@26	2788 case PNG_FILTER_VALUE_NONE:
nuclear@26	2789 break;
nuclear@26	2790 case PNG_FILTER_VALUE_SUB:
nuclear@26	2791 {
nuclear@26	2792 png_uint_32 i;
nuclear@26	2793 png_uint_32 istop = row_info->rowbytes;
nuclear@26	2794 png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
nuclear@26	2795 png_bytep rp = row + bpp;
nuclear@26	2796 png_bytep lp = row;
nuclear@26	2797
nuclear@26	2798 for (i = bpp; i < istop; i++)
nuclear@26	2799 {
nuclear@26	2800 rp = (png_byte)(((int)(rp) + (int)(*lp++)) & 0xff);
nuclear@26	2801 rp++;
nuclear@26	2802 }
nuclear@26	2803 break;
nuclear@26	2804 }
nuclear@26	2805 case PNG_FILTER_VALUE_UP:
nuclear@26	2806 {
nuclear@26	2807 png_uint_32 i;
nuclear@26	2808 png_uint_32 istop = row_info->rowbytes;
nuclear@26	2809 png_bytep rp = row;
nuclear@26	2810 png_bytep pp = prev_row;
nuclear@26	2811
nuclear@26	2812 for (i = 0; i < istop; i++)
nuclear@26	2813 {
nuclear@26	2814 rp = (png_byte)(((int)(rp) + (int)(*pp++)) & 0xff);
nuclear@26	2815 rp++;
nuclear@26	2816 }
nuclear@26	2817 break;
nuclear@26	2818 }
nuclear@26	2819 case PNG_FILTER_VALUE_AVG:
nuclear@26	2820 {
nuclear@26	2821 png_uint_32 i;
nuclear@26	2822 png_bytep rp = row;
nuclear@26	2823 png_bytep pp = prev_row;
nuclear@26	2824 png_bytep lp = row;
nuclear@26	2825 png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
nuclear@26	2826 png_uint_32 istop = row_info->rowbytes - bpp;
nuclear@26	2827
nuclear@26	2828 for (i = 0; i < bpp; i++)
nuclear@26	2829 {
nuclear@26	2830 rp = (png_byte)(((int)(rp) +
nuclear@26	2831 ((int)(*pp++) / 2 )) & 0xff);
nuclear@26	2832 rp++;
nuclear@26	2833 }
nuclear@26	2834
nuclear@26	2835 for (i = 0; i < istop; i++)
nuclear@26	2836 {
nuclear@26	2837 rp = (png_byte)(((int)(rp) +
nuclear@26	2838 (int)(pp++ + lp++) / 2 ) & 0xff);
nuclear@26	2839 rp++;
nuclear@26	2840 }
nuclear@26	2841 break;
nuclear@26	2842 }
nuclear@26	2843 case PNG_FILTER_VALUE_PAETH:
nuclear@26	2844 {
nuclear@26	2845 png_uint_32 i;
nuclear@26	2846 png_bytep rp = row;
nuclear@26	2847 png_bytep pp = prev_row;
nuclear@26	2848 png_bytep lp = row;
nuclear@26	2849 png_bytep cp = prev_row;
nuclear@26	2850 png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
nuclear@26	2851 png_uint_32 istop=row_info->rowbytes - bpp;
nuclear@26	2852
nuclear@26	2853 for (i = 0; i < bpp; i++)
nuclear@26	2854 {
nuclear@26	2855 rp = (png_byte)(((int)(rp) + (int)(*pp++)) & 0xff);
nuclear@26	2856 rp++;
nuclear@26	2857 }
nuclear@26	2858
nuclear@26	2859 for (i = 0; i < istop; i++) /* use leftover rp,pp */
nuclear@26	2860 {
nuclear@26	2861 int a, b, c, pa, pb, pc, p;
nuclear@26	2862
nuclear@26	2863 a = *lp++;
nuclear@26	2864 b = *pp++;
nuclear@26	2865 c = *cp++;
nuclear@26	2866
nuclear@26	2867 p = b - c;
nuclear@26	2868 pc = a - c;
nuclear@26	2869
nuclear@26	2870 #ifdef PNG_USE_ABS
nuclear@26	2871 pa = abs(p);
nuclear@26	2872 pb = abs(pc);
nuclear@26	2873 pc = abs(p + pc);
nuclear@26	2874 #else
nuclear@26	2875 pa = p < 0 ? -p : p;
nuclear@26	2876 pb = pc < 0 ? -pc : pc;
nuclear@26	2877 pc = (p + pc) < 0 ? -(p + pc) : p + pc;
nuclear@26	2878 #endif
nuclear@26	2879
nuclear@26	2880 /*
nuclear@26	2881 if (pa <= pb && pa <= pc)
nuclear@26	2882 p = a;
nuclear@26	2883 else if (pb <= pc)
nuclear@26	2884 p = b;
nuclear@26	2885 else
nuclear@26	2886 p = c;
nuclear@26	2887 */
nuclear@26	2888
nuclear@26	2889 p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c;
nuclear@26	2890
nuclear@26	2891 rp = (png_byte)(((int)(rp) + p) & 0xff);
nuclear@26	2892 rp++;
nuclear@26	2893 }
nuclear@26	2894 break;
nuclear@26	2895 }
nuclear@26	2896 default:
nuclear@26	2897 png_warning(png_ptr, "Ignoring bad adaptive filter type");
nuclear@26	2898 *row = 0;
nuclear@26	2899 break;
nuclear@26	2900 }
nuclear@26	2901 }
nuclear@26	2902
nuclear@26	2903 void /* PRIVATE */
nuclear@26	2904 png_read_finish_row(png_structp png_ptr)
nuclear@26	2905 {
nuclear@26	2906 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@26	2907 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@26	2908 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
nuclear@26	2909
nuclear@26	2910 /* start of interlace block */
nuclear@26	2911 PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
nuclear@26	2912
nuclear@26	2913 /* offset to next interlace block */
nuclear@26	2914 PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
nuclear@26	2915
nuclear@26	2916 /* start of interlace block in the y direction */
nuclear@26	2917 PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
nuclear@26	2918
nuclear@26	2919 /* offset to next interlace block in the y direction */
nuclear@26	2920 PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
nuclear@26	2921 #endif /* PNG_READ_INTERLACING_SUPPORTED */
nuclear@26	2922 #endif
nuclear@26	2923
nuclear@26	2924 png_debug(1, "in png_read_finish_row\n");
nuclear@26	2925 png_ptr->row_number++;
nuclear@26	2926 if (png_ptr->row_number < png_ptr->num_rows)
nuclear@26	2927 return;
nuclear@26	2928
nuclear@26	2929 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@26	2930 if (png_ptr->interlaced)
nuclear@26	2931 {
nuclear@26	2932 png_ptr->row_number = 0;
nuclear@26	2933 png_memset_check(png_ptr, png_ptr->prev_row, 0,
nuclear@26	2934 png_ptr->rowbytes + 1);
nuclear@26	2935 do
nuclear@26	2936 {
nuclear@26	2937 png_ptr->pass++;
nuclear@26	2938 if (png_ptr->pass >= 7)
nuclear@26	2939 break;
nuclear@26	2940 png_ptr->iwidth = (png_ptr->width +
nuclear@26	2941 png_pass_inc[png_ptr->pass] - 1 -
nuclear@26	2942 png_pass_start[png_ptr->pass]) /
nuclear@26	2943 png_pass_inc[png_ptr->pass];
nuclear@26	2944
nuclear@26	2945 png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
nuclear@26	2946 png_ptr->iwidth) + 1;
nuclear@26	2947
nuclear@26	2948 if (!(png_ptr->transformations & PNG_INTERLACE))
nuclear@26	2949 {
nuclear@26	2950 png_ptr->num_rows = (png_ptr->height +
nuclear@26	2951 png_pass_yinc[png_ptr->pass] - 1 -
nuclear@26	2952 png_pass_ystart[png_ptr->pass]) /
nuclear@26	2953 png_pass_yinc[png_ptr->pass];
nuclear@26	2954 if (!(png_ptr->num_rows))
nuclear@26	2955 continue;
nuclear@26	2956 }
nuclear@26	2957 else /* if (png_ptr->transformations & PNG_INTERLACE) */
nuclear@26	2958 break;
nuclear@26	2959 } while (png_ptr->iwidth == 0);
nuclear@26	2960
nuclear@26	2961 if (png_ptr->pass < 7)
nuclear@26	2962 return;
nuclear@26	2963 }
nuclear@26	2964 #endif /* PNG_READ_INTERLACING_SUPPORTED */
nuclear@26	2965
nuclear@26	2966 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@26	2967 {
nuclear@26	2968 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@26	2969 PNG_CONST PNG_IDAT;
nuclear@26	2970 #endif
nuclear@26	2971 char extra;
nuclear@26	2972 int ret;
nuclear@26	2973
nuclear@26	2974 png_ptr->zstream.next_out = (Byte *)&extra;
nuclear@26	2975 png_ptr->zstream.avail_out = (uInt)1;
nuclear@26	2976 for (;;)
nuclear@26	2977 {
nuclear@26	2978 if (!(png_ptr->zstream.avail_in))
nuclear@26	2979 {
nuclear@26	2980 while (!png_ptr->idat_size)
nuclear@26	2981 {
nuclear@26	2982 png_byte chunk_length[4];
nuclear@26	2983
nuclear@26	2984 png_crc_finish(png_ptr, 0);
nuclear@26	2985
nuclear@26	2986 png_read_data(png_ptr, chunk_length, 4);
nuclear@26	2987 png_ptr->idat_size = png_get_uint_31(png_ptr, chunk_length);
nuclear@26	2988 png_reset_crc(png_ptr);
nuclear@26	2989 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
nuclear@26	2990 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@26	2991 png_error(png_ptr, "Not enough image data");
nuclear@26	2992
nuclear@26	2993 }
nuclear@26	2994 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
nuclear@26	2995 png_ptr->zstream.next_in = png_ptr->zbuf;
nuclear@26	2996 if (png_ptr->zbuf_size > png_ptr->idat_size)
nuclear@26	2997 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
nuclear@26	2998 png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in);
nuclear@26	2999 png_ptr->idat_size -= png_ptr->zstream.avail_in;
nuclear@26	3000 }
nuclear@26	3001 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@26	3002 if (ret == Z_STREAM_END)
nuclear@26	3003 {
nuclear@26	3004 if (!(png_ptr->zstream.avail_out) \|\| png_ptr->zstream.avail_in \|\|
nuclear@26	3005 png_ptr->idat_size)
nuclear@26	3006 png_warning(png_ptr, "Extra compressed data");
nuclear@26	3007 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	3008 png_ptr->flags \|= PNG_FLAG_ZLIB_FINISHED;
nuclear@26	3009 break;
nuclear@26	3010 }
nuclear@26	3011 if (ret != Z_OK)
nuclear@26	3012 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
nuclear@26	3013 "Decompression Error");
nuclear@26	3014
nuclear@26	3015 if (!(png_ptr->zstream.avail_out))
nuclear@26	3016 {
nuclear@26	3017 png_warning(png_ptr, "Extra compressed data.");
nuclear@26	3018 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	3019 png_ptr->flags \|= PNG_FLAG_ZLIB_FINISHED;
nuclear@26	3020 break;
nuclear@26	3021 }
nuclear@26	3022
nuclear@26	3023 }
nuclear@26	3024 png_ptr->zstream.avail_out = 0;
nuclear@26	3025 }
nuclear@26	3026
nuclear@26	3027 if (png_ptr->idat_size \|\| png_ptr->zstream.avail_in)
nuclear@26	3028 png_warning(png_ptr, "Extra compression data");
nuclear@26	3029
nuclear@26	3030 inflateReset(&png_ptr->zstream);
nuclear@26	3031
nuclear@26	3032 png_ptr->mode \|= PNG_AFTER_IDAT;
nuclear@26	3033 }
nuclear@26	3034
nuclear@26	3035 void /* PRIVATE */
nuclear@26	3036 png_read_start_row(png_structp png_ptr)
nuclear@26	3037 {
nuclear@26	3038 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@26	3039 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@26	3040 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
nuclear@26	3041
nuclear@26	3042 /* start of interlace block */
nuclear@26	3043 PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
nuclear@26	3044
nuclear@26	3045 /* offset to next interlace block */
nuclear@26	3046 PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
nuclear@26	3047
nuclear@26	3048 /* start of interlace block in the y direction */
nuclear@26	3049 PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
nuclear@26	3050
nuclear@26	3051 /* offset to next interlace block in the y direction */
nuclear@26	3052 PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
nuclear@26	3053 #endif
nuclear@26	3054 #endif
nuclear@26	3055
nuclear@26	3056 int max_pixel_depth;
nuclear@26	3057 png_size_t row_bytes;
nuclear@26	3058
nuclear@26	3059 png_debug(1, "in png_read_start_row\n");
nuclear@26	3060 png_ptr->zstream.avail_in = 0;
nuclear@26	3061 png_init_read_transformations(png_ptr);
nuclear@26	3062 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@26	3063 if (png_ptr->interlaced)
nuclear@26	3064 {
nuclear@26	3065 if (!(png_ptr->transformations & PNG_INTERLACE))
nuclear@26	3066 png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
nuclear@26	3067 png_pass_ystart[0]) / png_pass_yinc[0];
nuclear@26	3068 else
nuclear@26	3069 png_ptr->num_rows = png_ptr->height;
nuclear@26	3070
nuclear@26	3071 png_ptr->iwidth = (png_ptr->width +
nuclear@26	3072 png_pass_inc[png_ptr->pass] - 1 -
nuclear@26	3073 png_pass_start[png_ptr->pass]) /
nuclear@26	3074 png_pass_inc[png_ptr->pass];
nuclear@26	3075
nuclear@26	3076 png_ptr->irowbytes =
nuclear@26	3077 PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1;
nuclear@26	3078 }
nuclear@26	3079 else
nuclear@26	3080 #endif /* PNG_READ_INTERLACING_SUPPORTED */
nuclear@26	3081 {
nuclear@26	3082 png_ptr->num_rows = png_ptr->height;
nuclear@26	3083 png_ptr->iwidth = png_ptr->width;
nuclear@26	3084 png_ptr->irowbytes = png_ptr->rowbytes + 1;
nuclear@26	3085 }
nuclear@26	3086 max_pixel_depth = png_ptr->pixel_depth;
nuclear@26	3087
nuclear@26	3088 #if defined(PNG_READ_PACK_SUPPORTED)
nuclear@26	3089 if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8)
nuclear@26	3090 max_pixel_depth = 8;
nuclear@26	3091 #endif
nuclear@26	3092
nuclear@26	3093 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@26	3094 if (png_ptr->transformations & PNG_EXPAND)
nuclear@26	3095 {
nuclear@26	3096 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	3097 {
nuclear@26	3098 if (png_ptr->num_trans)
nuclear@26	3099 max_pixel_depth = 32;
nuclear@26	3100 else
nuclear@26	3101 max_pixel_depth = 24;
nuclear@26	3102 }
nuclear@26	3103 else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
nuclear@26	3104 {
nuclear@26	3105 if (max_pixel_depth < 8)
nuclear@26	3106 max_pixel_depth = 8;
nuclear@26	3107 if (png_ptr->num_trans)
nuclear@26	3108 max_pixel_depth *= 2;
nuclear@26	3109 }
nuclear@26	3110 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
nuclear@26	3111 {
nuclear@26	3112 if (png_ptr->num_trans)
nuclear@26	3113 {
nuclear@26	3114 max_pixel_depth *= 4;
nuclear@26	3115 max_pixel_depth /= 3;
nuclear@26	3116 }
nuclear@26	3117 }
nuclear@26	3118 }
nuclear@26	3119 #endif
nuclear@26	3120
nuclear@26	3121 #if defined(PNG_READ_FILLER_SUPPORTED)
nuclear@26	3122 if (png_ptr->transformations & (PNG_FILLER))
nuclear@26	3123 {
nuclear@26	3124 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26	3125 max_pixel_depth = 32;
nuclear@26	3126 else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
nuclear@26	3127 {
nuclear@26	3128 if (max_pixel_depth <= 8)
nuclear@26	3129 max_pixel_depth = 16;
nuclear@26	3130 else
nuclear@26	3131 max_pixel_depth = 32;
nuclear@26	3132 }
nuclear@26	3133 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
nuclear@26	3134 {
nuclear@26	3135 if (max_pixel_depth <= 32)
nuclear@26	3136 max_pixel_depth = 32;
nuclear@26	3137 else
nuclear@26	3138 max_pixel_depth = 64;
nuclear@26	3139 }
nuclear@26	3140 }
nuclear@26	3141 #endif
nuclear@26	3142
nuclear@26	3143 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
nuclear@26	3144 if (png_ptr->transformations & PNG_GRAY_TO_RGB)
nuclear@26	3145 {
nuclear@26	3146 if (
nuclear@26	3147 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@26	3148 (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) \|\|
nuclear@26	3149 #endif
nuclear@26	3150 #if defined(PNG_READ_FILLER_SUPPORTED)
nuclear@26	3151 (png_ptr->transformations & (PNG_FILLER)) \|\|
nuclear@26	3152 #endif
nuclear@26	3153 png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
nuclear@26	3154 {
nuclear@26	3155 if (max_pixel_depth <= 16)
nuclear@26	3156 max_pixel_depth = 32;
nuclear@26	3157 else
nuclear@26	3158 max_pixel_depth = 64;
nuclear@26	3159 }
nuclear@26	3160 else
nuclear@26	3161 {
nuclear@26	3162 if (max_pixel_depth <= 8)
nuclear@26	3163 {
nuclear@26	3164 if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
nuclear@26	3165 max_pixel_depth = 32;
nuclear@26	3166 else
nuclear@26	3167 max_pixel_depth = 24;
nuclear@26	3168 }
nuclear@26	3169 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
nuclear@26	3170 max_pixel_depth = 64;
nuclear@26	3171 else
nuclear@26	3172 max_pixel_depth = 48;
nuclear@26	3173 }
nuclear@26	3174 }
nuclear@26	3175 #endif
nuclear@26	3176
nuclear@26	3177 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
nuclear@26	3178 defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
nuclear@26	3179 if (png_ptr->transformations & PNG_USER_TRANSFORM)
nuclear@26	3180 {
nuclear@26	3181 int user_pixel_depth = png_ptr->user_transform_depth*
nuclear@26	3182 png_ptr->user_transform_channels;
nuclear@26	3183 if (user_pixel_depth > max_pixel_depth)
nuclear@26	3184 max_pixel_depth=user_pixel_depth;
nuclear@26	3185 }
nuclear@26	3186 #endif
nuclear@26	3187
nuclear@26	3188 /* align the width on the next larger 8 pixels. Mainly used
nuclear@26	3189 for interlacing */
nuclear@26	3190 row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
nuclear@26	3191 /* calculate the maximum bytes needed, adding a byte and a pixel
nuclear@26	3192 for safety's sake */
nuclear@26	3193 row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
nuclear@26	3194 1 + ((max_pixel_depth + 7) >> 3);
nuclear@26	3195 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	3196 if (row_bytes > (png_uint_32)65536L)
nuclear@26	3197 png_error(png_ptr, "This image requires a row greater than 64KB");
nuclear@26	3198 #endif
nuclear@26	3199
nuclear@26	3200 if (row_bytes + 64 > png_ptr->old_big_row_buf_size)
nuclear@26	3201 {
nuclear@26	3202 png_free(png_ptr, png_ptr->big_row_buf);
nuclear@26	3203 png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
nuclear@26	3204 png_ptr->row_buf = png_ptr->big_row_buf+32;
nuclear@26	3205 png_ptr->old_big_row_buf_size = row_bytes+64;
nuclear@26	3206 }
nuclear@26	3207
nuclear@26	3208 #ifdef PNG_MAX_MALLOC_64K
nuclear@26	3209 if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
nuclear@26	3210 png_error(png_ptr, "This image requires a row greater than 64KB");
nuclear@26	3211 #endif
nuclear@26	3212 if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
nuclear@26	3213 png_error(png_ptr, "Row has too many bytes to allocate in memory.");
nuclear@26	3214
nuclear@26	3215 if (png_ptr->rowbytes+1 > png_ptr->old_prev_row_size)
nuclear@26	3216 {
nuclear@26	3217 png_free(png_ptr, png_ptr->prev_row);
nuclear@26	3218 png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
nuclear@26	3219 png_ptr->rowbytes + 1));
nuclear@26	3220 png_ptr->old_prev_row_size = png_ptr->rowbytes+1;
nuclear@26	3221 }
nuclear@26	3222
nuclear@26	3223 png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
nuclear@26	3224
nuclear@26	3225 png_debug1(3, "width = %lu,\n", png_ptr->width);
nuclear@26	3226 png_debug1(3, "height = %lu,\n", png_ptr->height);
nuclear@26	3227 png_debug1(3, "iwidth = %lu,\n", png_ptr->iwidth);
nuclear@26	3228 png_debug1(3, "num_rows = %lu\n", png_ptr->num_rows);
nuclear@26	3229 png_debug1(3, "rowbytes = %lu,\n", png_ptr->rowbytes);
nuclear@26	3230 png_debug1(3, "irowbytes = %lu,\n", png_ptr->irowbytes);
nuclear@26	3231
nuclear@26	3232 png_ptr->flags \|= PNG_FLAG_ROW_INIT;
nuclear@26	3233 }
nuclear@26	3234 #endif /* PNG_READ_SUPPORTED */