dbf-halloween2015

annotate libs/libpng/pngwio.c @ 3:c37fe5d8a4ed

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windows port
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 01 Nov 2015 06:04:28 +0200
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nuclear@1 1
nuclear@1 2 /* pngwio.c - functions for data output
nuclear@1 3 *
nuclear@1 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@1 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@1 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@1 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@1 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@1 9 *
nuclear@1 10 * This file provides a location for all output. Users who need
nuclear@1 11 * special handling are expected to write functions that have the same
nuclear@1 12 * arguments as these and perform similar functions, but that possibly
nuclear@1 13 * use different output methods. Note that you shouldn't change these
nuclear@1 14 * functions, but rather write replacement functions and then change
nuclear@1 15 * them at run time with png_set_write_fn(...).
nuclear@1 16 */
nuclear@1 17
nuclear@1 18 #define PNG_INTERNAL
nuclear@1 19 #include "png.h"
nuclear@1 20 #ifdef PNG_WRITE_SUPPORTED
nuclear@1 21
nuclear@1 22 /* Write the data to whatever output you are using. The default routine
nuclear@1 23 writes to a file pointer. Note that this routine sometimes gets called
nuclear@1 24 with very small lengths, so you should implement some kind of simple
nuclear@1 25 buffering if you are using unbuffered writes. This should never be asked
nuclear@1 26 to write more than 64K on a 16 bit machine. */
nuclear@1 27
nuclear@1 28 void /* PRIVATE */
nuclear@1 29 png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
nuclear@1 30 {
nuclear@1 31 if (png_ptr->write_data_fn != NULL )
nuclear@1 32 (*(png_ptr->write_data_fn))(png_ptr, data, length);
nuclear@1 33 else
nuclear@1 34 png_error(png_ptr, "Call to NULL write function");
nuclear@1 35 }
nuclear@1 36
nuclear@1 37 #if !defined(PNG_NO_STDIO)
nuclear@1 38 /* This is the function that does the actual writing of data. If you are
nuclear@1 39 not writing to a standard C stream, you should create a replacement
nuclear@1 40 write_data function and use it at run time with png_set_write_fn(), rather
nuclear@1 41 than changing the library. */
nuclear@1 42 #ifndef USE_FAR_KEYWORD
nuclear@1 43 void PNGAPI
nuclear@1 44 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
nuclear@1 45 {
nuclear@1 46 png_uint_32 check;
nuclear@1 47
nuclear@1 48 if (png_ptr == NULL) return;
nuclear@1 49 #if defined(_WIN32_WCE)
nuclear@1 50 if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
nuclear@1 51 check = 0;
nuclear@1 52 #else
nuclear@1 53 check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
nuclear@1 54 #endif
nuclear@1 55 if (check != length)
nuclear@1 56 png_error(png_ptr, "Write Error");
nuclear@1 57 }
nuclear@1 58 #else
nuclear@1 59 /* this is the model-independent version. Since the standard I/O library
nuclear@1 60 can't handle far buffers in the medium and small models, we have to copy
nuclear@1 61 the data.
nuclear@1 62 */
nuclear@1 63
nuclear@1 64 #define NEAR_BUF_SIZE 1024
nuclear@1 65 #define MIN(a,b) (a <= b ? a : b)
nuclear@1 66
nuclear@1 67 void PNGAPI
nuclear@1 68 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
nuclear@1 69 {
nuclear@1 70 png_uint_32 check;
nuclear@1 71 png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */
nuclear@1 72 png_FILE_p io_ptr;
nuclear@1 73
nuclear@1 74 if (png_ptr == NULL) return;
nuclear@1 75 /* Check if data really is near. If so, use usual code. */
nuclear@1 76 near_data = (png_byte *)CVT_PTR_NOCHECK(data);
nuclear@1 77 io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
nuclear@1 78 if ((png_bytep)near_data == data)
nuclear@1 79 {
nuclear@1 80 #if defined(_WIN32_WCE)
nuclear@1 81 if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
nuclear@1 82 check = 0;
nuclear@1 83 #else
nuclear@1 84 check = fwrite(near_data, 1, length, io_ptr);
nuclear@1 85 #endif
nuclear@1 86 }
nuclear@1 87 else
nuclear@1 88 {
nuclear@1 89 png_byte buf[NEAR_BUF_SIZE];
nuclear@1 90 png_size_t written, remaining, err;
nuclear@1 91 check = 0;
nuclear@1 92 remaining = length;
nuclear@1 93 do
nuclear@1 94 {
nuclear@1 95 written = MIN(NEAR_BUF_SIZE, remaining);
nuclear@1 96 png_memcpy(buf, data, written); /* copy far buffer to near buffer */
nuclear@1 97 #if defined(_WIN32_WCE)
nuclear@1 98 if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
nuclear@1 99 err = 0;
nuclear@1 100 #else
nuclear@1 101 err = fwrite(buf, 1, written, io_ptr);
nuclear@1 102 #endif
nuclear@1 103 if (err != written)
nuclear@1 104 break;
nuclear@1 105 else
nuclear@1 106 check += err;
nuclear@1 107 data += written;
nuclear@1 108 remaining -= written;
nuclear@1 109 }
nuclear@1 110 while (remaining != 0);
nuclear@1 111 }
nuclear@1 112 if (check != length)
nuclear@1 113 png_error(png_ptr, "Write Error");
nuclear@1 114 }
nuclear@1 115
nuclear@1 116 #endif
nuclear@1 117 #endif
nuclear@1 118
nuclear@1 119 /* This function is called to output any data pending writing (normally
nuclear@1 120 to disk). After png_flush is called, there should be no data pending
nuclear@1 121 writing in any buffers. */
nuclear@1 122 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@1 123 void /* PRIVATE */
nuclear@1 124 png_flush(png_structp png_ptr)
nuclear@1 125 {
nuclear@1 126 if (png_ptr->output_flush_fn != NULL)
nuclear@1 127 (*(png_ptr->output_flush_fn))(png_ptr);
nuclear@1 128 }
nuclear@1 129
nuclear@1 130 #if !defined(PNG_NO_STDIO)
nuclear@1 131 void PNGAPI
nuclear@1 132 png_default_flush(png_structp png_ptr)
nuclear@1 133 {
nuclear@1 134 #if !defined(_WIN32_WCE)
nuclear@1 135 png_FILE_p io_ptr;
nuclear@1 136 #endif
nuclear@1 137 if (png_ptr == NULL) return;
nuclear@1 138 #if !defined(_WIN32_WCE)
nuclear@1 139 io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
nuclear@1 140 if (io_ptr != NULL)
nuclear@1 141 fflush(io_ptr);
nuclear@1 142 #endif
nuclear@1 143 }
nuclear@1 144 #endif
nuclear@1 145 #endif
nuclear@1 146
nuclear@1 147 /* This function allows the application to supply new output functions for
nuclear@1 148 libpng if standard C streams aren't being used.
nuclear@1 149
nuclear@1 150 This function takes as its arguments:
nuclear@1 151 png_ptr - pointer to a png output data structure
nuclear@1 152 io_ptr - pointer to user supplied structure containing info about
nuclear@1 153 the output functions. May be NULL.
nuclear@1 154 write_data_fn - pointer to a new output function that takes as its
nuclear@1 155 arguments a pointer to a png_struct, a pointer to
nuclear@1 156 data to be written, and a 32-bit unsigned int that is
nuclear@1 157 the number of bytes to be written. The new write
nuclear@1 158 function should call png_error(png_ptr, "Error msg")
nuclear@1 159 to exit and output any fatal error messages.
nuclear@1 160 flush_data_fn - pointer to a new flush function that takes as its
nuclear@1 161 arguments a pointer to a png_struct. After a call to
nuclear@1 162 the flush function, there should be no data in any buffers
nuclear@1 163 or pending transmission. If the output method doesn't do
nuclear@1 164 any buffering of ouput, a function prototype must still be
nuclear@1 165 supplied although it doesn't have to do anything. If
nuclear@1 166 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
nuclear@1 167 time, output_flush_fn will be ignored, although it must be
nuclear@1 168 supplied for compatibility. */
nuclear@1 169 void PNGAPI
nuclear@1 170 png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
nuclear@1 171 png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
nuclear@1 172 {
nuclear@1 173 if (png_ptr == NULL) return;
nuclear@1 174 png_ptr->io_ptr = io_ptr;
nuclear@1 175
nuclear@1 176 #if !defined(PNG_NO_STDIO)
nuclear@1 177 if (write_data_fn != NULL)
nuclear@1 178 png_ptr->write_data_fn = write_data_fn;
nuclear@1 179 else
nuclear@1 180 png_ptr->write_data_fn = png_default_write_data;
nuclear@1 181 #else
nuclear@1 182 png_ptr->write_data_fn = write_data_fn;
nuclear@1 183 #endif
nuclear@1 184
nuclear@1 185 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@1 186 #if !defined(PNG_NO_STDIO)
nuclear@1 187 if (output_flush_fn != NULL)
nuclear@1 188 png_ptr->output_flush_fn = output_flush_fn;
nuclear@1 189 else
nuclear@1 190 png_ptr->output_flush_fn = png_default_flush;
nuclear@1 191 #else
nuclear@1 192 png_ptr->output_flush_fn = output_flush_fn;
nuclear@1 193 #endif
nuclear@1 194 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
nuclear@1 195
nuclear@1 196 /* It is an error to read while writing a png file */
nuclear@1 197 if (png_ptr->read_data_fn != NULL)
nuclear@1 198 {
nuclear@1 199 png_ptr->read_data_fn = NULL;
nuclear@1 200 png_warning(png_ptr,
nuclear@1 201 "Attempted to set both read_data_fn and write_data_fn in");
nuclear@1 202 png_warning(png_ptr,
nuclear@1 203 "the same structure. Resetting read_data_fn to NULL.");
nuclear@1 204 }
nuclear@1 205 }
nuclear@1 206
nuclear@1 207 #if defined(USE_FAR_KEYWORD)
nuclear@1 208 #if defined(_MSC_VER)
nuclear@1 209 void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
nuclear@1 210 {
nuclear@1 211 void *near_ptr;
nuclear@1 212 void FAR *far_ptr;
nuclear@1 213 FP_OFF(near_ptr) = FP_OFF(ptr);
nuclear@1 214 far_ptr = (void FAR *)near_ptr;
nuclear@1 215 if (check != 0)
nuclear@1 216 if (FP_SEG(ptr) != FP_SEG(far_ptr))
nuclear@1 217 png_error(png_ptr, "segment lost in conversion");
nuclear@1 218 return(near_ptr);
nuclear@1 219 }
nuclear@1 220 # else
nuclear@1 221 void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
nuclear@1 222 {
nuclear@1 223 void *near_ptr;
nuclear@1 224 void FAR *far_ptr;
nuclear@1 225 near_ptr = (void FAR *)ptr;
nuclear@1 226 far_ptr = (void FAR *)near_ptr;
nuclear@1 227 if (check != 0)
nuclear@1 228 if (far_ptr != ptr)
nuclear@1 229 png_error(png_ptr, "segment lost in conversion");
nuclear@1 230 return(near_ptr);
nuclear@1 231 }
nuclear@1 232 # endif
nuclear@1 233 # endif
nuclear@1 234 #endif /* PNG_WRITE_SUPPORTED */