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Defines | Typedefs | Functions
png.c File Reference
#include "png.h"

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Defines

#define PNG_INTERNAL
#define PNG_NO_EXTERN

Typedefs

typedef version_1_2_7 Your_png_h_is_not_version_1_2_7

Functions

void PNGAPI png_set_sig_bytes (png_structp png_ptr, int num_bytes)
int PNGAPI png_sig_cmp (png_bytep sig, png_size_t start, png_size_t num_to_check)
int PNGAPI png_check_sig (png_bytep sig, int num)
voidpf png_zalloc (voidpf png_ptr, uInt items, uInt size)
void png_zfree (voidpf png_ptr, voidpf ptr)
void png_reset_crc (png_structp png_ptr)
void png_calculate_crc (png_structp png_ptr, png_bytep ptr, png_size_t length)
png_infop PNGAPI png_create_info_struct (png_structp png_ptr)
void PNGAPI png_destroy_info_struct (png_structp png_ptr, png_infopp info_ptr_ptr)
void PNGAPI png_info_init (png_infop info_ptr)
void PNGAPI png_info_init_3 (png_infopp ptr_ptr, png_size_t png_info_struct_size)
void PNGAPI png_data_freer (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask)
void PNGAPI png_free_data (png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num)
void png_info_destroy (png_structp png_ptr, png_infop info_ptr)
png_voidp PNGAPI png_get_io_ptr (png_structp png_ptr)
void PNGAPI png_init_io (png_structp png_ptr, png_FILE_p fp)
png_charp PNGAPI png_convert_to_rfc1123 (png_structp png_ptr, png_timep ptime)
png_charp PNGAPI png_get_copyright (png_structp png_ptr)
png_charp PNGAPI png_get_libpng_ver (png_structp png_ptr)
png_charp PNGAPI png_get_header_ver (png_structp png_ptr)
png_charp PNGAPI png_get_header_version (png_structp png_ptr)
int PNGAPI png_reset_zstream (png_structp png_ptr)
png_uint_32 PNGAPI png_access_version_number (void)
void png_init_mmx_flags (png_structp png_ptr)
int PNGAPI png_mmx_support (void)

Define Documentation

Definition at line 11 of file png.c.

Definition at line 12 of file png.c.


Typedef Documentation

Definition at line 16 of file png.c.


Function Documentation

Definition at line 749 of file png.c.

{
   /* Version of *.c files used when building libpng */
   return((png_uint_32) PNG_LIBPNG_VER);
}
void png_calculate_crc ( png_structp  png_ptr,
png_bytep  ptr,
png_size_t  length 
)

Definition at line 205 of file png.c.

{
   int need_crc = 1;

   if (png_ptr->chunk_name[0] & 0x20)                     /* ancillary */
   {
      if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
          (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
         need_crc = 0;
   }
   else                                                    /* critical */
   {
      if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
         need_crc = 0;
   }

   if (need_crc)
      png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
}

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int PNGAPI png_check_sig ( png_bytep  sig,
int  num 
)

Definition at line 132 of file png.c.

{
  return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
}

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Definition at line 624 of file png.c.

{
   static PNG_CONST char short_months[12][4] =
        {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

   if (png_ptr->time_buffer == NULL)
   {
      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
         png_sizeof(char)));
   }

#if defined(_WIN32_WCE)
   {
      wchar_t time_buf[29];
      wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
          ptime->day % 32, short_months[(ptime->month - 1) % 12],
        ptime->year, ptime->hour % 24, ptime->minute % 60,
          ptime->second % 61);
      WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
          NULL, NULL);
   }
#else
#ifdef USE_FAR_KEYWORD
   {
      char near_time_buf[29];
      sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
          ptime->day % 32, short_months[(ptime->month - 1) % 12],
          ptime->year, ptime->hour % 24, ptime->minute % 60,
          ptime->second % 61);
      png_memcpy(png_ptr->time_buffer, near_time_buf,
          29*png_sizeof(char));
   }
#else
   sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
       ptime->day % 32, short_months[(ptime->month - 1) % 12],
       ptime->year, ptime->hour % 24, ptime->minute % 60,
       ptime->second % 61);
#endif
#endif /* _WIN32_WCE */
   return ((png_charp)png_ptr->time_buffer);
}

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Definition at line 232 of file png.c.

{
   png_infop info_ptr;

   png_debug(1, "in png_create_info_struct\n");
   if(png_ptr == NULL) return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
   info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
      png_ptr->malloc_fn, png_ptr->mem_ptr);
#else
   info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
#endif
   if (info_ptr != NULL)
      png_info_init_3(&info_ptr, png_sizeof(png_info));

   return (info_ptr);
}

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void PNGAPI png_data_freer ( png_structp  png_ptr,
png_infop  info_ptr,
int  freer,
png_uint_32  mask 
)

Definition at line 310 of file png.c.

{
   png_debug(1, "in png_data_freer\n");
   if (png_ptr == NULL || info_ptr == NULL)
      return;
   if(freer == PNG_DESTROY_WILL_FREE_DATA)
      info_ptr->free_me |= mask;
   else if(freer == PNG_USER_WILL_FREE_DATA)
      info_ptr->free_me &= ~mask;
   else
      png_warning(png_ptr,
         "Unknown freer parameter in png_data_freer.");
}

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void PNGAPI png_destroy_info_struct ( png_structp  png_ptr,
png_infopp  info_ptr_ptr 
)

Definition at line 256 of file png.c.

{
   png_infop info_ptr = NULL;

   png_debug(1, "in png_destroy_info_struct\n");
   if (info_ptr_ptr != NULL)
      info_ptr = *info_ptr_ptr;

   if (info_ptr != NULL)
   {
      png_info_destroy(png_ptr, info_ptr);

#ifdef PNG_USER_MEM_SUPPORTED
      png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
          png_ptr->mem_ptr);
#else
      png_destroy_struct((png_voidp)info_ptr);
#endif
      *info_ptr_ptr = NULL;
   }
}

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void PNGAPI png_free_data ( png_structp  png_ptr,
png_infop  info_ptr,
png_uint_32  mask,
int  num 
)

Definition at line 327 of file png.c.

{
   png_debug(1, "in png_free_data\n");
   if (png_ptr == NULL || info_ptr == NULL)
      return;

#if defined(PNG_TEXT_SUPPORTED)
/* free text item num or (if num == -1) all text items */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
#else
if (mask & PNG_FREE_TEXT)
#endif
{
   if (num != -1)
   {
     if (info_ptr->text && info_ptr->text[num].key)
     {
         png_free(png_ptr, info_ptr->text[num].key);
         info_ptr->text[num].key = NULL;
     }
   }
   else
   {
       int i;
       for (i = 0; i < info_ptr->num_text; i++)
           png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
       png_free(png_ptr, info_ptr->text);
       info_ptr->text = NULL;
       info_ptr->num_text=0;
   }
}
#endif

#if defined(PNG_tRNS_SUPPORTED)
/* free any tRNS entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
#endif
{
    png_free(png_ptr, info_ptr->trans);
    info_ptr->valid &= ~PNG_INFO_tRNS;
#ifndef PNG_FREE_ME_SUPPORTED
    png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
#endif
    info_ptr->trans = NULL;
}
#endif

#if defined(PNG_sCAL_SUPPORTED)
/* free any sCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
#else
if (mask & PNG_FREE_SCAL)
#endif
{
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
    png_free(png_ptr, info_ptr->scal_s_width);
    png_free(png_ptr, info_ptr->scal_s_height);
    info_ptr->scal_s_width = NULL;
    info_ptr->scal_s_height = NULL;
#endif
    info_ptr->valid &= ~PNG_INFO_sCAL;
}
#endif

#if defined(PNG_pCAL_SUPPORTED)
/* free any pCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
#else
if (mask & PNG_FREE_PCAL)
#endif
{
    png_free(png_ptr, info_ptr->pcal_purpose);
    png_free(png_ptr, info_ptr->pcal_units);
    info_ptr->pcal_purpose = NULL;
    info_ptr->pcal_units = NULL;
    if (info_ptr->pcal_params != NULL)
    {
        int i;
        for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
        {
          png_free(png_ptr, info_ptr->pcal_params[i]);
          info_ptr->pcal_params[i]=NULL;
        }
        png_free(png_ptr, info_ptr->pcal_params);
        info_ptr->pcal_params = NULL;
    }
    info_ptr->valid &= ~PNG_INFO_pCAL;
}
#endif

#if defined(PNG_iCCP_SUPPORTED)
/* free any iCCP entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
#else
if (mask & PNG_FREE_ICCP)
#endif
{
    png_free(png_ptr, info_ptr->iccp_name);
    png_free(png_ptr, info_ptr->iccp_profile);
    info_ptr->iccp_name = NULL;
    info_ptr->iccp_profile = NULL;
    info_ptr->valid &= ~PNG_INFO_iCCP;
}
#endif

#if defined(PNG_sPLT_SUPPORTED)
/* free a given sPLT entry, or (if num == -1) all sPLT entries */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
#else
if (mask & PNG_FREE_SPLT)
#endif
{
   if (num != -1)
   {
      if(info_ptr->splt_palettes)
      {
          png_free(png_ptr, info_ptr->splt_palettes[num].name);
          png_free(png_ptr, info_ptr->splt_palettes[num].entries);
          info_ptr->splt_palettes[num].name = NULL;
          info_ptr->splt_palettes[num].entries = NULL;
      }
   }
   else
   {
       if(info_ptr->splt_palettes_num)
       {
         int i;
         for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
            png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);

         png_free(png_ptr, info_ptr->splt_palettes);
         info_ptr->splt_palettes = NULL;
         info_ptr->splt_palettes_num = 0;
       }
       info_ptr->valid &= ~PNG_INFO_sPLT;
   }
}
#endif

#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
#else
if (mask & PNG_FREE_UNKN)
#endif
{
   if (num != -1)
   {
       if(info_ptr->unknown_chunks)
       {
          png_free(png_ptr, info_ptr->unknown_chunks[num].data);
          info_ptr->unknown_chunks[num].data = NULL;
       }
   }
   else
   {
       int i;

       if(info_ptr->unknown_chunks_num)
       {
         for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
            png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);

         png_free(png_ptr, info_ptr->unknown_chunks);
         info_ptr->unknown_chunks = NULL;
         info_ptr->unknown_chunks_num = 0;
       }
   }
}
#endif

#if defined(PNG_hIST_SUPPORTED)
/* free any hIST entry */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
#else
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
#endif
{
    png_free(png_ptr, info_ptr->hist);
    info_ptr->hist = NULL;
    info_ptr->valid &= ~PNG_INFO_hIST;
#ifndef PNG_FREE_ME_SUPPORTED
    png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
#endif
}
#endif

/* free any PLTE entry that was internally allocated */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
#else
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
#endif
{
    png_zfree(png_ptr, info_ptr->palette);
    info_ptr->palette = NULL;
    info_ptr->valid &= ~PNG_INFO_PLTE;
#ifndef PNG_FREE_ME_SUPPORTED
    png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
#endif
    info_ptr->num_palette = 0;
}

#if defined(PNG_INFO_IMAGE_SUPPORTED)
/* free any image bits attached to the info structure */
#ifdef PNG_FREE_ME_SUPPORTED
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
#else
if (mask & PNG_FREE_ROWS)
#endif
{
    if(info_ptr->row_pointers)
    {
       int row;
       for (row = 0; row < (int)info_ptr->height; row++)
       {
          png_free(png_ptr, info_ptr->row_pointers[row]);
          info_ptr->row_pointers[row]=NULL;
       }
       png_free(png_ptr, info_ptr->row_pointers);
       info_ptr->row_pointers=NULL;
    }
    info_ptr->valid &= ~PNG_INFO_IDAT;
}
#endif

#ifdef PNG_FREE_ME_SUPPORTED
   if(num == -1)
     info_ptr->free_me &= ~mask;
   else
     info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
#endif
}

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Definition at line 678 of file png.c.

{
   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
   return ((png_charp) "\n libpng version 1.2.7 - September 12, 2004\n\
   Copyright (c) 1998-2004 Glenn Randers-Pehrson\n\
   Copyright (c) 1996-1997 Andreas Dilger\n\
   Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
   return ((png_charp) "");
}

Definition at line 706 of file png.c.

{
   /* Version of *.h files used when building libpng */
   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
      return ((png_charp) PNG_LIBPNG_VER_STRING);
   return ((png_charp) "");
}

Definition at line 715 of file png.c.

{
   /* Returns longer string containing both version and date */
   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
      return ((png_charp) PNG_HEADER_VERSION_STRING);
   return ((png_charp) "");
}

Definition at line 599 of file png.c.

{
   return (png_ptr->io_ptr);
}

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Definition at line 697 of file png.c.

{
   /* Version of *.c files used when building libpng */
   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
      return ((png_charp) PNG_LIBPNG_VER_STRING);
   return ((png_charp) "");
}
void png_info_destroy ( png_structp  png_ptr,
png_infop  info_ptr 
)

Definition at line 576 of file png.c.

{
   png_debug(1, "in png_info_destroy\n");

   png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);

#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
   if (png_ptr->num_chunk_list)
   {
       png_free(png_ptr, png_ptr->chunk_list);
       png_ptr->chunk_list=NULL;
       png_ptr->num_chunk_list=0;
   }
#endif

   png_info_init_3(&info_ptr, png_sizeof(png_info));
}

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Definition at line 284 of file png.c.

{
   /* We only come here via pre-1.0.12-compiled applications */
   png_info_init_3(&info_ptr, 0);
}

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void PNGAPI png_info_init_3 ( png_infopp  ptr_ptr,
png_size_t  png_info_struct_size 
)

Definition at line 291 of file png.c.

{
   png_infop info_ptr = *ptr_ptr;

   png_debug(1, "in png_info_init_3\n");

   if(png_sizeof(png_info) > png_info_struct_size)
     {
       png_destroy_struct(info_ptr);
       info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
       *ptr_ptr = info_ptr;
     }

   /* set everything to 0 */
   png_memset(info_ptr, 0, png_sizeof (png_info));
}

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void PNGAPI png_init_io ( png_structp  png_ptr,
png_FILE_p  fp 
)

Definition at line 612 of file png.c.

{
   png_debug(1, "in png_init_io\n");
   png_ptr->io_ptr = (png_voidp)fp;
}

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Definition at line 761 of file png.c.

{
    png_ptr->mmx_rowbytes_threshold = 0;
    png_ptr->mmx_bitdepth_threshold = 0;

#  if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))

    png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;

    if (png_mmx_support() > 0) {
        png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
#    ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
                              | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
#    endif
#    ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
                              | PNG_ASM_FLAG_MMX_READ_INTERLACE
#    endif
#    ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
                              ;
#    else
                              | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
                              | PNG_ASM_FLAG_MMX_READ_FILTER_UP
                              | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
                              | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;

        png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
        png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
#    endif
    } else {
        png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
                               | PNG_MMX_READ_FLAGS
                               | PNG_MMX_WRITE_FLAGS );
    }

#  else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */

    /* clear all MMX flags; no support is compiled in */
    png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );

#  endif /* ?(PNGVCRD || PNGGCCRD) */
}

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Definition at line 809 of file png.c.

{
    return -1;
}

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Definition at line 194 of file png.c.

{
   png_ptr->crc = crc32(0, Z_NULL, 0);
}

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Definition at line 742 of file png.c.

{
   return (inflateReset(&png_ptr->zstream));
}
void PNGAPI png_set_sig_bytes ( png_structp  png_ptr,
int  num_bytes 
)

Definition at line 92 of file png.c.

{
   png_debug(1, "in png_set_sig_bytes\n");
   if (num_bytes > 8)
      png_error(png_ptr, "Too many bytes for PNG signature.");

   png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
}

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int PNGAPI png_sig_cmp ( png_bytep  sig,
png_size_t  start,
png_size_t  num_to_check 
)

Definition at line 110 of file png.c.

{
   png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
   if (num_to_check > 8)
      num_to_check = 8;
   else if (num_to_check < 1)
      return (0);

   if (start > 7)
      return (0);

   if (start + num_to_check > 8)
      num_to_check = 8 - start;

   return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
}

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voidpf png_zalloc ( voidpf  png_ptr,
uInt  items,
uInt  size 
)

Definition at line 143 of file png.c.

{
   png_voidp ptr;
   png_structp p=png_ptr;
   png_uint_32 save_flags=p->flags;
   png_uint_32 num_bytes;

   if (items > PNG_UINT_32_MAX/size)
   {
     png_warning (png_ptr, "Potential overflow in png_zalloc()");
     return (NULL);
   }
   num_bytes = (png_uint_32)items * size;

   p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
   ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
   p->flags=save_flags;

#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
   if (ptr == NULL)
       return ((voidpf)ptr);

   if (num_bytes > (png_uint_32)0x8000L)
   {
      png_memset(ptr, 0, (png_size_t)0x8000L);
      png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
         (png_size_t)(num_bytes - (png_uint_32)0x8000L));
   }
   else
   {
      png_memset(ptr, 0, (png_size_t)num_bytes);
   }
#endif
   return ((voidpf)ptr);
}

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void png_zfree ( voidpf  png_ptr,
voidpf  ptr 
)

Definition at line 185 of file png.c.

{
   png_free((png_structp)png_ptr, (png_voidp)ptr);
}

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