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Imported from libpng-0.89.tar

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This commit is contained in:
Guy Schalnat
1996-06-05 15:50:50 -05:00
committed by Glenn Randers-Pehrson
parent b2e01bd505
commit e5a37797b4
38 changed files with 3198 additions and 2062 deletions
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60
png.c
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@@ -1,10 +1,10 @@
/* png.c - location for general purpose png functions
libpng 1.0 beta 2 - version 0.88
libpng 1.0 beta 3 - version 0.89
For conditions of distribution and use, see copyright notice in png.h
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 25, 1996
May 25, 1996
*/
#define PNG_INTERNAL
@@ -13,7 +13,7 @@
/* version information for c files. This better match the version
string defined in png.h */
char png_libpng_ver[] = "0.88";
char png_libpng_ver[] = "0.89";
/* place to hold the signiture string for a png file. */
png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -25,39 +25,17 @@ png_byte FARDATA png_IHDR[4] = { 73, 72, 68, 82};
png_byte FARDATA png_IDAT[4] = { 73, 68, 65, 84};
png_byte FARDATA png_IEND[4] = { 73, 69, 78, 68};
png_byte FARDATA png_PLTE[4] = { 80, 76, 84, 69};
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
png_byte FARDATA png_gAMA[4] = {103, 65, 77, 65};
#endif
#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
png_byte FARDATA png_sBIT[4] = {115, 66, 73, 84};
#endif
#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
png_byte FARDATA png_cHRM[4] = { 99, 72, 82, 77};
#endif
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
png_byte FARDATA png_tRNS[4] = {116, 82, 78, 83};
#endif
#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
png_byte FARDATA png_bKGD[4] = { 98, 75, 71, 68};
#endif
#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
png_byte FARDATA png_hIST[4] = {104, 73, 83, 84};
#endif
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED)
png_byte FARDATA png_tEXt[4] = {116, 69, 88, 116};
#endif
#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
png_byte FARDATA png_zTXt[4] = {122, 84, 88, 116};
#endif
#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
png_byte FARDATA png_pHYs[4] = {112, 72, 89, 115};
#endif
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
png_byte FARDATA png_oFFs[4] = {111, 70, 70, 115};
#endif
#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
png_byte FARDATA png_tIME[4] = {116, 73, 77, 69};
#endif
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
@@ -209,6 +187,21 @@ png_calculate_crc(png_structp png_ptr, png_bytep ptr,
{
png_ptr->crc = update_crc(png_ptr->crc, ptr, length);
}
png_infop
png_create_info_struct(png_structp png_ptr)
{
png_infop info_ptr;
if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
{
png_memset(info_ptr, 0, sizeof(png_info));
png_ptr->do_free |= PNG_FREE_INFO;
}
return info_ptr;
}
void
png_info_init(png_infop info)
{
@@ -216,3 +209,20 @@ png_info_init(png_infop info)
png_memset(info, 0, sizeof (png_info));
}
/* This function returns a pointer to the io_ptr associated with the user
functions. The application should free any memory associated with this
pointer before png_write_destroy and png_read_destroy are called. */
png_voidp
png_get_io_ptr(png_structp png_ptr)
{
return png_ptr->io_ptr;
}
/* Initialize the default input/output functions for the png file. If you
change the read, or write routines, you can call either png_set_read_fn()
or png_set_write_fn() instead of png_init_io(). */
void
png_init_io(png_structp png_ptr, FILE *fp)
{
png_ptr->io_ptr = (png_voidp)fp;
}