nuclear@26: 
nuclear@26: /* png.c - location for general purpose libpng functions
nuclear@26:  *
nuclear@26:  * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@26:  * For conditions of distribution and use, see copyright notice in png.h
nuclear@26:  * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@26:  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@26:  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@26:  */
nuclear@26: 
nuclear@26: #define PNG_INTERNAL
nuclear@26: #define PNG_NO_EXTERN
nuclear@26: #include "png.h"
nuclear@26: 
nuclear@26: /* Generate a compiler error if there is an old png.h in the search path. */
nuclear@26: typedef version_1_2_33 Your_png_h_is_not_version_1_2_33;
nuclear@26: 
nuclear@26: /* Version information for C files.  This had better match the version
nuclear@26:  * string defined in png.h.  */
nuclear@26: 
nuclear@26: #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26: /* png_libpng_ver was changed to a function in version 1.0.5c */
nuclear@26: PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
nuclear@26: 
nuclear@26: #ifdef PNG_READ_SUPPORTED
nuclear@26: 
nuclear@26: /* png_sig was changed to a function in version 1.0.5c */
nuclear@26: /* Place to hold the signature string for a PNG file. */
nuclear@26: PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
nuclear@26: #endif /* PNG_READ_SUPPORTED */
nuclear@26: 
nuclear@26: /* Invoke global declarations for constant strings for known chunk types */
nuclear@26: PNG_IHDR;
nuclear@26: PNG_IDAT;
nuclear@26: PNG_IEND;
nuclear@26: PNG_PLTE;
nuclear@26: PNG_bKGD;
nuclear@26: PNG_cHRM;
nuclear@26: PNG_gAMA;
nuclear@26: PNG_hIST;
nuclear@26: PNG_iCCP;
nuclear@26: PNG_iTXt;
nuclear@26: PNG_oFFs;
nuclear@26: PNG_pCAL;
nuclear@26: PNG_sCAL;
nuclear@26: PNG_pHYs;
nuclear@26: PNG_sBIT;
nuclear@26: PNG_sPLT;
nuclear@26: PNG_sRGB;
nuclear@26: PNG_tEXt;
nuclear@26: PNG_tIME;
nuclear@26: PNG_tRNS;
nuclear@26: PNG_zTXt;
nuclear@26: 
nuclear@26: #ifdef PNG_READ_SUPPORTED
nuclear@26: /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
nuclear@26: 
nuclear@26: /* start of interlace block */
nuclear@26: PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
nuclear@26: 
nuclear@26: /* offset to next interlace block */
nuclear@26: PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@26: 
nuclear@26: /* start of interlace block in the y direction */
nuclear@26: PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
nuclear@26: 
nuclear@26: /* offset to next interlace block in the y direction */
nuclear@26: PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
nuclear@26: 
nuclear@26: /* Height of interlace block.  This is not currently used - if you need
nuclear@26:  * it, uncomment it here and in png.h
nuclear@26: PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@26: */
nuclear@26: 
nuclear@26: /* Mask to determine which pixels are valid in a pass */
nuclear@26: PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
nuclear@26: 
nuclear@26: /* Mask to determine which pixels to overwrite while displaying */
nuclear@26: PNG_CONST int FARDATA png_pass_dsp_mask[]
nuclear@26:    = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
nuclear@26: 
nuclear@26: #endif /* PNG_READ_SUPPORTED */
nuclear@26: #endif /* PNG_USE_GLOBAL_ARRAYS */
nuclear@26: 
nuclear@26: /* Tells libpng that we have already handled the first "num_bytes" bytes
nuclear@26:  * of the PNG file signature.  If the PNG data is embedded into another
nuclear@26:  * stream we can set num_bytes = 8 so that libpng will not attempt to read
nuclear@26:  * or write any of the magic bytes before it starts on the IHDR.
nuclear@26:  */
nuclear@26: 
nuclear@26: #ifdef PNG_READ_SUPPORTED
nuclear@26: void PNGAPI
nuclear@26: png_set_sig_bytes(png_structp png_ptr, int num_bytes)
nuclear@26: {
nuclear@26:    if (png_ptr == NULL) return;
nuclear@26:    png_debug(1, "in png_set_sig_bytes\n");
nuclear@26:    if (num_bytes > 8)
nuclear@26:       png_error(png_ptr, "Too many bytes for PNG signature.");
nuclear@26: 
nuclear@26:    png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
nuclear@26: }
nuclear@26: 
nuclear@26: /* Checks whether the supplied bytes match the PNG signature.  We allow
nuclear@26:  * checking less than the full 8-byte signature so that those apps that
nuclear@26:  * already read the first few bytes of a file to determine the file type
nuclear@26:  * can simply check the remaining bytes for extra assurance.  Returns
nuclear@26:  * an integer less than, equal to, or greater than zero if sig is found,
nuclear@26:  * respectively, to be less than, to match, or be greater than the correct
nuclear@26:  * PNG signature (this is the same behaviour as strcmp, memcmp, etc).
nuclear@26:  */
nuclear@26: int PNGAPI
nuclear@26: png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
nuclear@26: {
nuclear@26:    png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
nuclear@26:    if (num_to_check > 8)
nuclear@26:       num_to_check = 8;
nuclear@26:    else if (num_to_check < 1)
nuclear@26:       return (-1);
nuclear@26: 
nuclear@26:    if (start > 7)
nuclear@26:       return (-1);
nuclear@26: 
nuclear@26:    if (start + num_to_check > 8)
nuclear@26:       num_to_check = 8 - start;
nuclear@26: 
nuclear@26:    return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
nuclear@26: }
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@26: /* (Obsolete) function to check signature bytes.  It does not allow one
nuclear@26:  * to check a partial signature.  This function might be removed in the
nuclear@26:  * future - use png_sig_cmp().  Returns true (nonzero) if the file is PNG.
nuclear@26:  */
nuclear@26: int PNGAPI
nuclear@26: png_check_sig(png_bytep sig, int num)
nuclear@26: {
nuclear@26:   return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
nuclear@26: }
nuclear@26: #endif
nuclear@26: #endif /* PNG_READ_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@26: /* Function to allocate memory for zlib and clear it to 0. */
nuclear@26: #ifdef PNG_1_0_X
nuclear@26: voidpf PNGAPI
nuclear@26: #else
nuclear@26: voidpf /* private */
nuclear@26: #endif
nuclear@26: png_zalloc(voidpf png_ptr, uInt items, uInt size)
nuclear@26: {
nuclear@26:    png_voidp ptr;
nuclear@26:    png_structp p=(png_structp)png_ptr;
nuclear@26:    png_uint_32 save_flags=p->flags;
nuclear@26:    png_uint_32 num_bytes;
nuclear@26: 
nuclear@26:    if (png_ptr == NULL) return (NULL);
nuclear@26:    if (items > PNG_UINT_32_MAX/size)
nuclear@26:    {
nuclear@26:      png_warning (p, "Potential overflow in png_zalloc()");
nuclear@26:      return (NULL);
nuclear@26:    }
nuclear@26:    num_bytes = (png_uint_32)items * size;
nuclear@26: 
nuclear@26:    p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
nuclear@26:    ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
nuclear@26:    p->flags=save_flags;
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
nuclear@26:    if (ptr == NULL)
nuclear@26:        return ((voidpf)ptr);
nuclear@26: 
nuclear@26:    if (num_bytes > (png_uint_32)0x8000L)
nuclear@26:    {
nuclear@26:       png_memset(ptr, 0, (png_size_t)0x8000L);
nuclear@26:       png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
nuclear@26:          (png_size_t)(num_bytes - (png_uint_32)0x8000L));
nuclear@26:    }
nuclear@26:    else
nuclear@26:    {
nuclear@26:       png_memset(ptr, 0, (png_size_t)num_bytes);
nuclear@26:    }
nuclear@26: #endif
nuclear@26:    return ((voidpf)ptr);
nuclear@26: }
nuclear@26: 
nuclear@26: /* function to free memory for zlib */
nuclear@26: #ifdef PNG_1_0_X
nuclear@26: void PNGAPI
nuclear@26: #else
nuclear@26: void /* private */
nuclear@26: #endif
nuclear@26: png_zfree(voidpf png_ptr, voidpf ptr)
nuclear@26: {
nuclear@26:    png_free((png_structp)png_ptr, (png_voidp)ptr);
nuclear@26: }
nuclear@26: 
nuclear@26: /* Reset the CRC variable to 32 bits of 1's.  Care must be taken
nuclear@26:  * in case CRC is > 32 bits to leave the top bits 0.
nuclear@26:  */
nuclear@26: void /* PRIVATE */
nuclear@26: png_reset_crc(png_structp png_ptr)
nuclear@26: {
nuclear@26:    png_ptr->crc = crc32(0, Z_NULL, 0);
nuclear@26: }
nuclear@26: 
nuclear@26: /* Calculate the CRC over a section of data.  We can only pass as
nuclear@26:  * much data to this routine as the largest single buffer size.  We
nuclear@26:  * also check that this data will actually be used before going to the
nuclear@26:  * trouble of calculating it.
nuclear@26:  */
nuclear@26: void /* PRIVATE */
nuclear@26: png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
nuclear@26: {
nuclear@26:    int need_crc = 1;
nuclear@26: 
nuclear@26:    if (png_ptr->chunk_name[0] & 0x20)                     /* ancillary */
nuclear@26:    {
nuclear@26:       if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
nuclear@26:           (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
nuclear@26:          need_crc = 0;
nuclear@26:    }
nuclear@26:    else                                                    /* critical */
nuclear@26:    {
nuclear@26:       if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
nuclear@26:          need_crc = 0;
nuclear@26:    }
nuclear@26: 
nuclear@26:    if (need_crc)
nuclear@26:       png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
nuclear@26: }
nuclear@26: 
nuclear@26: /* Allocate the memory for an info_struct for the application.  We don't
nuclear@26:  * really need the png_ptr, but it could potentially be useful in the
nuclear@26:  * future.  This should be used in favour of malloc(png_sizeof(png_info))
nuclear@26:  * and png_info_init() so that applications that want to use a shared
nuclear@26:  * libpng don't have to be recompiled if png_info changes size.
nuclear@26:  */
nuclear@26: png_infop PNGAPI
nuclear@26: png_create_info_struct(png_structp png_ptr)
nuclear@26: {
nuclear@26:    png_infop info_ptr;
nuclear@26: 
nuclear@26:    png_debug(1, "in png_create_info_struct\n");
nuclear@26:    if (png_ptr == NULL) return (NULL);
nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26:    info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
nuclear@26:       png_ptr->malloc_fn, png_ptr->mem_ptr);
nuclear@26: #else
nuclear@26:    info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
nuclear@26: #endif
nuclear@26:    if (info_ptr != NULL)
nuclear@26:       png_info_init_3(&info_ptr, png_sizeof(png_info));
nuclear@26: 
nuclear@26:    return (info_ptr);
nuclear@26: }
nuclear@26: 
nuclear@26: /* This function frees the memory associated with a single info struct.
nuclear@26:  * Normally, one would use either png_destroy_read_struct() or
nuclear@26:  * png_destroy_write_struct() to free an info struct, but this may be
nuclear@26:  * useful for some applications.
nuclear@26:  */
nuclear@26: void PNGAPI
nuclear@26: png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
nuclear@26: {
nuclear@26:    png_infop info_ptr = NULL;
nuclear@26:    if (png_ptr == NULL) return;
nuclear@26: 
nuclear@26:    png_debug(1, "in png_destroy_info_struct\n");
nuclear@26:    if (info_ptr_ptr != NULL)
nuclear@26:       info_ptr = *info_ptr_ptr;
nuclear@26: 
nuclear@26:    if (info_ptr != NULL)
nuclear@26:    {
nuclear@26:       png_info_destroy(png_ptr, info_ptr);
nuclear@26: 
nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26:       png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
nuclear@26:           png_ptr->mem_ptr);
nuclear@26: #else
nuclear@26:       png_destroy_struct((png_voidp)info_ptr);
nuclear@26: #endif
nuclear@26:       *info_ptr_ptr = NULL;
nuclear@26:    }
nuclear@26: }
nuclear@26: 
nuclear@26: /* Initialize the info structure.  This is now an internal function (0.89)
nuclear@26:  * and applications using it are urged to use png_create_info_struct()
nuclear@26:  * instead.
nuclear@26:  */
nuclear@26: #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@26: #undef png_info_init
nuclear@26: void PNGAPI
nuclear@26: png_info_init(png_infop info_ptr)
nuclear@26: {
nuclear@26:    /* We only come here via pre-1.0.12-compiled applications */
nuclear@26:    png_info_init_3(&info_ptr, 0);
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: void PNGAPI
nuclear@26: png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
nuclear@26: {
nuclear@26:    png_infop info_ptr = *ptr_ptr;
nuclear@26: 
nuclear@26:    if (info_ptr == NULL) return;
nuclear@26: 
nuclear@26:    png_debug(1, "in png_info_init_3\n");
nuclear@26: 
nuclear@26:    if (png_sizeof(png_info) > png_info_struct_size)
nuclear@26:      {
nuclear@26:        png_destroy_struct(info_ptr);
nuclear@26:        info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
nuclear@26:        *ptr_ptr = info_ptr;
nuclear@26:      }
nuclear@26: 
nuclear@26:    /* set everything to 0 */
nuclear@26:    png_memset(info_ptr, 0, png_sizeof(png_info));
nuclear@26: }
nuclear@26: 
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: void PNGAPI
nuclear@26: png_data_freer(png_structp png_ptr, png_infop info_ptr,
nuclear@26:    int freer, png_uint_32 mask)
nuclear@26: {
nuclear@26:    png_debug(1, "in png_data_freer\n");
nuclear@26:    if (png_ptr == NULL || info_ptr == NULL)
nuclear@26:       return;
nuclear@26:    if (freer == PNG_DESTROY_WILL_FREE_DATA)
nuclear@26:       info_ptr->free_me |= mask;
nuclear@26:    else if (freer == PNG_USER_WILL_FREE_DATA)
nuclear@26:       info_ptr->free_me &= ~mask;
nuclear@26:    else
nuclear@26:       png_warning(png_ptr,
nuclear@26:          "Unknown freer parameter in png_data_freer.");
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: void PNGAPI
nuclear@26: png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
nuclear@26:    int num)
nuclear@26: {
nuclear@26:    png_debug(1, "in png_free_data\n");
nuclear@26:    if (png_ptr == NULL || info_ptr == NULL)
nuclear@26:       return;
nuclear@26: 
nuclear@26: #if defined(PNG_TEXT_SUPPORTED)
nuclear@26: /* free text item num or (if num == -1) all text items */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if (mask & PNG_FREE_TEXT)
nuclear@26: #endif
nuclear@26: {
nuclear@26:    if (num != -1)
nuclear@26:    {
nuclear@26:      if (info_ptr->text && info_ptr->text[num].key)
nuclear@26:      {
nuclear@26:          png_free(png_ptr, info_ptr->text[num].key);
nuclear@26:          info_ptr->text[num].key = NULL;
nuclear@26:      }
nuclear@26:    }
nuclear@26:    else
nuclear@26:    {
nuclear@26:        int i;
nuclear@26:        for (i = 0; i < info_ptr->num_text; i++)
nuclear@26:            png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
nuclear@26:        png_free(png_ptr, info_ptr->text);
nuclear@26:        info_ptr->text = NULL;
nuclear@26:        info_ptr->num_text=0;
nuclear@26:    }
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tRNS_SUPPORTED)
nuclear@26: /* free any tRNS entry */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
nuclear@26: #endif
nuclear@26: {
nuclear@26:     png_free(png_ptr, info_ptr->trans);
nuclear@26:     info_ptr->trans = NULL;
nuclear@26:     info_ptr->valid &= ~PNG_INFO_tRNS;
nuclear@26: #ifndef PNG_FREE_ME_SUPPORTED
nuclear@26:     png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
nuclear@26: #endif
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sCAL_SUPPORTED)
nuclear@26: /* free any sCAL entry */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if (mask & PNG_FREE_SCAL)
nuclear@26: #endif
nuclear@26: {
nuclear@26: #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26:     png_free(png_ptr, info_ptr->scal_s_width);
nuclear@26:     png_free(png_ptr, info_ptr->scal_s_height);
nuclear@26:     info_ptr->scal_s_width = NULL;
nuclear@26:     info_ptr->scal_s_height = NULL;
nuclear@26: #endif
nuclear@26:     info_ptr->valid &= ~PNG_INFO_sCAL;
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_pCAL_SUPPORTED)
nuclear@26: /* free any pCAL entry */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if (mask & PNG_FREE_PCAL)
nuclear@26: #endif
nuclear@26: {
nuclear@26:     png_free(png_ptr, info_ptr->pcal_purpose);
nuclear@26:     png_free(png_ptr, info_ptr->pcal_units);
nuclear@26:     info_ptr->pcal_purpose = NULL;
nuclear@26:     info_ptr->pcal_units = NULL;
nuclear@26:     if (info_ptr->pcal_params != NULL)
nuclear@26:     {
nuclear@26:         int i;
nuclear@26:         for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
nuclear@26:         {
nuclear@26:           png_free(png_ptr, info_ptr->pcal_params[i]);
nuclear@26:           info_ptr->pcal_params[i]=NULL;
nuclear@26:         }
nuclear@26:         png_free(png_ptr, info_ptr->pcal_params);
nuclear@26:         info_ptr->pcal_params = NULL;
nuclear@26:     }
nuclear@26:     info_ptr->valid &= ~PNG_INFO_pCAL;
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_iCCP_SUPPORTED)
nuclear@26: /* free any iCCP entry */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if (mask & PNG_FREE_ICCP)
nuclear@26: #endif
nuclear@26: {
nuclear@26:     png_free(png_ptr, info_ptr->iccp_name);
nuclear@26:     png_free(png_ptr, info_ptr->iccp_profile);
nuclear@26:     info_ptr->iccp_name = NULL;
nuclear@26:     info_ptr->iccp_profile = NULL;
nuclear@26:     info_ptr->valid &= ~PNG_INFO_iCCP;
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sPLT_SUPPORTED)
nuclear@26: /* free a given sPLT entry, or (if num == -1) all sPLT entries */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if (mask & PNG_FREE_SPLT)
nuclear@26: #endif
nuclear@26: {
nuclear@26:    if (num != -1)
nuclear@26:    {
nuclear@26:       if (info_ptr->splt_palettes)
nuclear@26:       {
nuclear@26:           png_free(png_ptr, info_ptr->splt_palettes[num].name);
nuclear@26:           png_free(png_ptr, info_ptr->splt_palettes[num].entries);
nuclear@26:           info_ptr->splt_palettes[num].name = NULL;
nuclear@26:           info_ptr->splt_palettes[num].entries = NULL;
nuclear@26:       }
nuclear@26:    }
nuclear@26:    else
nuclear@26:    {
nuclear@26:        if (info_ptr->splt_palettes_num)
nuclear@26:        {
nuclear@26:          int i;
nuclear@26:          for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
nuclear@26:             png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
nuclear@26: 
nuclear@26:          png_free(png_ptr, info_ptr->splt_palettes);
nuclear@26:          info_ptr->splt_palettes = NULL;
nuclear@26:          info_ptr->splt_palettes_num = 0;
nuclear@26:        }
nuclear@26:        info_ptr->valid &= ~PNG_INFO_sPLT;
nuclear@26:    }
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26:   if (png_ptr->unknown_chunk.data)
nuclear@26:   {
nuclear@26:     png_free(png_ptr, png_ptr->unknown_chunk.data);
nuclear@26:     png_ptr->unknown_chunk.data = NULL;
nuclear@26:   }
nuclear@26: 
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if (mask & PNG_FREE_UNKN)
nuclear@26: #endif
nuclear@26: {
nuclear@26:    if (num != -1)
nuclear@26:    {
nuclear@26:        if (info_ptr->unknown_chunks)
nuclear@26:        {
nuclear@26:           png_free(png_ptr, info_ptr->unknown_chunks[num].data);
nuclear@26:           info_ptr->unknown_chunks[num].data = NULL;
nuclear@26:        }
nuclear@26:    }
nuclear@26:    else
nuclear@26:    {
nuclear@26:        int i;
nuclear@26: 
nuclear@26:        if (info_ptr->unknown_chunks_num)
nuclear@26:        {
nuclear@26:          for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
nuclear@26:             png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
nuclear@26: 
nuclear@26:          png_free(png_ptr, info_ptr->unknown_chunks);
nuclear@26:          info_ptr->unknown_chunks = NULL;
nuclear@26:          info_ptr->unknown_chunks_num = 0;
nuclear@26:        }
nuclear@26:    }
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_hIST_SUPPORTED)
nuclear@26: /* free any hIST entry */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
nuclear@26: #endif
nuclear@26: {
nuclear@26:     png_free(png_ptr, info_ptr->hist);
nuclear@26:     info_ptr->hist = NULL;
nuclear@26:     info_ptr->valid &= ~PNG_INFO_hIST;
nuclear@26: #ifndef PNG_FREE_ME_SUPPORTED
nuclear@26:     png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
nuclear@26: #endif
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* free any PLTE entry that was internally allocated */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
nuclear@26: #endif
nuclear@26: {
nuclear@26:     png_zfree(png_ptr, info_ptr->palette);
nuclear@26:     info_ptr->palette = NULL;
nuclear@26:     info_ptr->valid &= ~PNG_INFO_PLTE;
nuclear@26: #ifndef PNG_FREE_ME_SUPPORTED
nuclear@26:     png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
nuclear@26: #endif
nuclear@26:     info_ptr->num_palette = 0;
nuclear@26: }
nuclear@26: 
nuclear@26: #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26: /* free any image bits attached to the info structure */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
nuclear@26: #else
nuclear@26: if (mask & PNG_FREE_ROWS)
nuclear@26: #endif
nuclear@26: {
nuclear@26:     if (info_ptr->row_pointers)
nuclear@26:     {
nuclear@26:        int row;
nuclear@26:        for (row = 0; row < (int)info_ptr->height; row++)
nuclear@26:        {
nuclear@26:           png_free(png_ptr, info_ptr->row_pointers[row]);
nuclear@26:           info_ptr->row_pointers[row]=NULL;
nuclear@26:        }
nuclear@26:        png_free(png_ptr, info_ptr->row_pointers);
nuclear@26:        info_ptr->row_pointers=NULL;
nuclear@26:     }
nuclear@26:     info_ptr->valid &= ~PNG_INFO_IDAT;
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26:    if (num == -1)
nuclear@26:      info_ptr->free_me &= ~mask;
nuclear@26:    else
nuclear@26:      info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
nuclear@26: #endif
nuclear@26: }
nuclear@26: 
nuclear@26: /* This is an internal routine to free any memory that the info struct is
nuclear@26:  * pointing to before re-using it or freeing the struct itself.  Recall
nuclear@26:  * that png_free() checks for NULL pointers for us.
nuclear@26:  */
nuclear@26: void /* PRIVATE */
nuclear@26: png_info_destroy(png_structp png_ptr, png_infop info_ptr)
nuclear@26: {
nuclear@26:    png_debug(1, "in png_info_destroy\n");
nuclear@26: 
nuclear@26:    png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
nuclear@26: 
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26:    if (png_ptr->num_chunk_list)
nuclear@26:    {
nuclear@26:        png_free(png_ptr, png_ptr->chunk_list);
nuclear@26:        png_ptr->chunk_list=NULL;
nuclear@26:        png_ptr->num_chunk_list = 0;
nuclear@26:    }
nuclear@26: #endif
nuclear@26: 
nuclear@26:    png_info_init_3(&info_ptr, png_sizeof(png_info));
nuclear@26: }
nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
nuclear@26: 
nuclear@26: /* This function returns a pointer to the io_ptr associated with the user
nuclear@26:  * functions.  The application should free any memory associated with this
nuclear@26:  * pointer before png_write_destroy() or png_read_destroy() are called.
nuclear@26:  */
nuclear@26: png_voidp PNGAPI
nuclear@26: png_get_io_ptr(png_structp png_ptr)
nuclear@26: {
nuclear@26:    if (png_ptr == NULL) return (NULL);
nuclear@26:    return (png_ptr->io_ptr);
nuclear@26: }
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@26: #if !defined(PNG_NO_STDIO)
nuclear@26: /* Initialize the default input/output functions for the PNG file.  If you
nuclear@26:  * use your own read or write routines, you can call either png_set_read_fn()
nuclear@26:  * or png_set_write_fn() instead of png_init_io().  If you have defined
nuclear@26:  * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
nuclear@26:  * necessarily available.
nuclear@26:  */
nuclear@26: void PNGAPI
nuclear@26: png_init_io(png_structp png_ptr, png_FILE_p fp)
nuclear@26: {
nuclear@26:    png_debug(1, "in png_init_io\n");
nuclear@26:    if (png_ptr == NULL) return;
nuclear@26:    png_ptr->io_ptr = (png_voidp)fp;
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@26: /* Convert the supplied time into an RFC 1123 string suitable for use in
nuclear@26:  * a "Creation Time" or other text-based time string.
nuclear@26:  */
nuclear@26: png_charp PNGAPI
nuclear@26: png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
nuclear@26: {
nuclear@26:    static PNG_CONST char short_months[12][4] =
nuclear@26:         {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
nuclear@26:          "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
nuclear@26: 
nuclear@26:    if (png_ptr == NULL) return (NULL);
nuclear@26:    if (png_ptr->time_buffer == NULL)
nuclear@26:    {
nuclear@26:       png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
nuclear@26:          png_sizeof(char)));
nuclear@26:    }
nuclear@26: 
nuclear@26: #if defined(_WIN32_WCE)
nuclear@26:    {
nuclear@26:       wchar_t time_buf[29];
nuclear@26:       wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
nuclear@26:           ptime->day % 32, short_months[(ptime->month - 1) % 12],
nuclear@26:         ptime->year, ptime->hour % 24, ptime->minute % 60,
nuclear@26:           ptime->second % 61);
nuclear@26:       WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
nuclear@26:           NULL, NULL);
nuclear@26:    }
nuclear@26: #else
nuclear@26: #ifdef USE_FAR_KEYWORD
nuclear@26:    {
nuclear@26:       char near_time_buf[29];
nuclear@26:       png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
nuclear@26:           ptime->day % 32, short_months[(ptime->month - 1) % 12],
nuclear@26:           ptime->year, ptime->hour % 24, ptime->minute % 60,
nuclear@26:           ptime->second % 61);
nuclear@26:       png_memcpy(png_ptr->time_buffer, near_time_buf,
nuclear@26:           29*png_sizeof(char));
nuclear@26:    }
nuclear@26: #else
nuclear@26:    png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
nuclear@26:        ptime->day % 32, short_months[(ptime->month - 1) % 12],
nuclear@26:        ptime->year, ptime->hour % 24, ptime->minute % 60,
nuclear@26:        ptime->second % 61);
nuclear@26: #endif
nuclear@26: #endif /* _WIN32_WCE */
nuclear@26:    return ((png_charp)png_ptr->time_buffer);
nuclear@26: }
nuclear@26: #endif /* PNG_TIME_RFC1123_SUPPORTED */
nuclear@26: 
nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
nuclear@26: 
nuclear@26: png_charp PNGAPI
nuclear@26: png_get_copyright(png_structp png_ptr)
nuclear@26: {
nuclear@26:    png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
nuclear@26:    return ((png_charp) "\n libpng version 1.2.33 - October 31, 2008\n\
nuclear@26:    Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\
nuclear@26:    Copyright (c) 1996-1997 Andreas Dilger\n\
nuclear@26:    Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
nuclear@26: }
nuclear@26: 
nuclear@26: /* The following return the library version as a short string in the
nuclear@26:  * format 1.0.0 through 99.99.99zz.  To get the version of *.h files
nuclear@26:  * used with your application, print out PNG_LIBPNG_VER_STRING, which
nuclear@26:  * is defined in png.h.
nuclear@26:  * Note: now there is no difference between png_get_libpng_ver() and
nuclear@26:  * png_get_header_ver().  Due to the version_nn_nn_nn typedef guard,
nuclear@26:  * it is guaranteed that png.c uses the correct version of png.h.
nuclear@26:  */
nuclear@26: png_charp PNGAPI
nuclear@26: png_get_libpng_ver(png_structp png_ptr)
nuclear@26: {
nuclear@26:    /* Version of *.c files used when building libpng */
nuclear@26:    png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
nuclear@26:    return ((png_charp) PNG_LIBPNG_VER_STRING);
nuclear@26: }
nuclear@26: 
nuclear@26: png_charp PNGAPI
nuclear@26: png_get_header_ver(png_structp png_ptr)
nuclear@26: {
nuclear@26:    /* Version of *.h files used when building libpng */
nuclear@26:    png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
nuclear@26:    return ((png_charp) PNG_LIBPNG_VER_STRING);
nuclear@26: }
nuclear@26: 
nuclear@26: png_charp PNGAPI
nuclear@26: png_get_header_version(png_structp png_ptr)
nuclear@26: {
nuclear@26:    /* Returns longer string containing both version and date */
nuclear@26:    png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
nuclear@26:    return ((png_charp) PNG_HEADER_VERSION_STRING
nuclear@26: #ifndef PNG_READ_SUPPORTED
nuclear@26:    "     (NO READ SUPPORT)"
nuclear@26: #endif
nuclear@26:    "\n");
nuclear@26: }
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@26: #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@26: int PNGAPI
nuclear@26: png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
nuclear@26: {
nuclear@26:    /* check chunk_name and return "keep" value if it's on the list, else 0 */
nuclear@26:    int i;
nuclear@26:    png_bytep p;
nuclear@26:    if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
nuclear@26:       return 0;
nuclear@26:    p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
nuclear@26:    for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
nuclear@26:       if (!png_memcmp(chunk_name, p, 4))
nuclear@26:         return ((int)*(p + 4));
nuclear@26:    return 0;
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* This function, added to libpng-1.0.6g, is untested. */
nuclear@26: int PNGAPI
nuclear@26: png_reset_zstream(png_structp png_ptr)
nuclear@26: {
nuclear@26:    if (png_ptr == NULL) return Z_STREAM_ERROR;
nuclear@26:    return (inflateReset(&png_ptr->zstream));
nuclear@26: }
nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
nuclear@26: 
nuclear@26: /* This function was added to libpng-1.0.7 */
nuclear@26: png_uint_32 PNGAPI
nuclear@26: png_access_version_number(void)
nuclear@26: {
nuclear@26:    /* Version of *.c files used when building libpng */
nuclear@26:    return((png_uint_32) PNG_LIBPNG_VER);
nuclear@26: }
nuclear@26: 
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@26: #if !defined(PNG_1_0_X)
nuclear@26: /* this function was added to libpng 1.2.0 */
nuclear@26: int PNGAPI
nuclear@26: png_mmx_support(void)
nuclear@26: {
nuclear@26:    /* obsolete, to be removed from libpng-1.4.0 */
nuclear@26:     return -1;
nuclear@26: }
nuclear@26: #endif /* PNG_1_0_X */
nuclear@26: #endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@26: #ifdef PNG_SIZE_T
nuclear@26: /* Added at libpng version 1.2.6 */
nuclear@26:    PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
nuclear@26: png_size_t PNGAPI
nuclear@26: png_convert_size(size_t size)
nuclear@26: {
nuclear@26:   if (size > (png_size_t)-1)
nuclear@26:      PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
nuclear@26:   return ((png_size_t)size);
nuclear@26: }
nuclear@26: #endif /* PNG_SIZE_T */
nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */