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Imported from libpng-1.4.0beta11.tar

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This commit is contained in:
Glenn Randers-Pehrson
2006-08-19 13:59:24 -05:00
parent 3424ee7354
commit beb572e616
90 changed files with 2151 additions and 2040 deletions
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279
pngwutil.c
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@@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file
*
* Last changed in libpng 1.4.0 April 20, 2006
* Last changed in libpng 1.4.0 July 20, 2006
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2006 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -10,7 +10,7 @@
#include "png.h"
#ifdef PNG_WRITE_SUPPORTED
#include "pngintrn.h"
#include "pngpriv.h"
/* Place a 32-bit number into a buffer in PNG byte order. We work
* with unsigned numbers for convenience, although one supported
@@ -61,9 +61,15 @@ void PNGAPI
png_write_sig(png_structp png_ptr)
{
png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
#ifdef PNG_IO_STATE_SUPPORTED
/* inform the I/O callback that the signature is being written */
png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE;
#endif
/* write the rest of the 8 byte signature */
png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
(png_size_t)8 - png_ptr->sig_bytes);
(png_size_t)(8 - png_ptr->sig_bytes));
if(png_ptr->sig_bytes < 3)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
@@ -94,19 +100,35 @@ void PNGAPI
png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
png_uint_32 length)
{
png_byte buf[4];
png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name,
(unsigned long) length);
png_byte buf[8];
png_debug2(0, "Writing %s chunk, length = %lu\n", chunk_name,
(unsigned long)length);
/* write the length */
#ifdef PNG_IO_STATE_SUPPORTED
/* Inform the I/O callback that the chunk header is being written.
* PNG_IO_CHUNK_HDR requires a single I/O call.
*/
png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR;
#endif
/* write the length and the chunk name */
png_save_uint_32(buf, length);
png_write_data(png_ptr, buf, (png_size_t)4);
png_memcpy(buf + 4, chunk_name, 4);
png_write_data(png_ptr, buf, 8);
/* put the chunk name into png_ptr->chunk_name */
png_memcpy(png_ptr->chunk_name, chunk_name, 4);
/* write the chunk name */
png_write_data(png_ptr, chunk_name, (png_size_t)4);
/* reset the crc and run it over the chunk name */
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, chunk_name, (png_size_t)4);
png_calculate_crc(png_ptr, chunk_name, 4);
#ifdef PNG_IO_STATE_SUPPORTED
/* Inform the I/O callback that chunk data will (possibly) be written.
* PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls.
*/
png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA;
#endif
}
/* Write the data of a PNG chunk started with png_write_chunk_start().
@@ -120,8 +142,11 @@ png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
/* write the data, and run the CRC over it */
if (data != NULL && length > 0)
{
png_calculate_crc(png_ptr, data, length);
png_write_data(png_ptr, data, length);
/* update the CRC after writing the data,
* in case that the user I/O routine alters it.
*/
png_calculate_crc(png_ptr, data, length);
}
}
@@ -131,10 +156,17 @@ png_write_chunk_end(png_structp png_ptr)
{
png_byte buf[4];
/* write the crc */
#ifdef PNG_IO_STATE_SUPPORTED
/* Inform the I/O callback that the chunk CRC is being written.
* PNG_IO_CHUNK_CRC requires a single I/O function call.
*/
png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC;
#endif
/* write the crc in a single operation */
png_save_uint_32(buf, png_ptr->crc);
png_write_data(png_ptr, buf, (png_size_t)4);
png_write_data(png_ptr, buf, 4);
}
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
@@ -237,21 +269,19 @@ png_text_compress(png_structp png_ptr,
old_ptr = comp->output_ptr;
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr *
png_sizeof (png_charpp)));
(png_size_t)(comp->max_output_ptr * sizeof(png_charpp)));
png_memcpy(comp->output_ptr, old_ptr, old_max
* png_sizeof (png_charp));
* sizeof(png_charp));
png_free(png_ptr, old_ptr);
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr *
png_sizeof (png_charp)));
(png_size_t)(comp->max_output_ptr * sizeof(png_charp)));
}
/* save the data */
comp->output_ptr[comp->num_output_ptr] = (png_charp)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
comp->output_ptr[comp->num_output_ptr] =
(png_charp)png_malloc(png_ptr, png_ptr->zbuf_size);
png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size);
comp->num_output_ptr++;
@@ -288,21 +318,19 @@ png_text_compress(png_structp png_ptr,
old_ptr = comp->output_ptr;
/* This could be optimized to realloc() */
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr *
png_sizeof (png_charpp)));
(png_size_t)(comp->max_output_ptr * sizeof(png_charpp)));
png_memcpy(comp->output_ptr, old_ptr,
old_max * png_sizeof (png_charp));
old_max * sizeof(png_charp));
png_free(png_ptr, old_ptr);
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
(png_uint_32)(comp->max_output_ptr *
png_sizeof (png_charp)));
(png_size_t)(comp->max_output_ptr * sizeof(png_charp)));
}
/* save off the data */
comp->output_ptr[comp->num_output_ptr] =
(png_charp)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size);
(png_charp)png_malloc(png_ptr, png_ptr->zbuf_size);
png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size);
comp->num_output_ptr++;
@@ -492,7 +520,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
buf[12] = (png_byte)interlace_type;
/* write the chunk */
png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, 13);
/* initialize zlib with PNG info */
png_ptr->zstream.zalloc = png_zalloc;
@@ -582,7 +610,7 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
buf[0] = pal_ptr->red;
buf[1] = pal_ptr->green;
buf[2] = pal_ptr->blue;
png_write_chunk_data(png_ptr, buf, (png_size_t)3);
png_write_chunk_data(png_ptr, buf, 3);
}
#else
/* This is a little slower but some buggy compilers need to do this instead */
@@ -592,7 +620,7 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
buf[0] = pal_ptr[i].red;
buf[1] = pal_ptr[i].green;
buf[2] = pal_ptr[i].blue;
png_write_chunk_data(png_ptr, buf, (png_size_t)3);
png_write_chunk_data(png_ptr, buf, 3);
}
#endif
png_write_chunk_end(png_ptr);
@@ -659,8 +687,7 @@ png_write_IEND(png_structp png_ptr)
PNG_IEND;
#endif
png_debug(1, "in png_write_IEND\n");
png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
(png_size_t)0);
png_write_chunk(png_ptr, (png_bytep)png_IEND, NULL, 0);
png_ptr->mode |= PNG_HAVE_IEND;
}
@@ -680,7 +707,7 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
/* file_gamma is saved in 1/100,000ths */
igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
png_save_uint_32(buf, igamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, 4);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
@@ -695,7 +722,7 @@ png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/100,000ths */
png_save_uint_32(buf, (png_uint_32)file_gamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, 4);
}
#endif
#endif
@@ -715,7 +742,7 @@ png_write_sRGB(png_structp png_ptr, int srgb_intent)
png_warning(png_ptr,
"Invalid sRGB rendering intent specified");
buf[0]=(png_byte)srgb_intent;
png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1);
png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, 1);
}
#endif
@@ -731,6 +758,7 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
png_size_t name_len;
png_charp new_name;
compression_state comp;
int embedded_profile_len = 0;
png_debug(1, "in png_write_iCCP\n");
@@ -753,9 +781,27 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
if (profile == NULL)
profile_len = 0;
if (profile_len > 3)
embedded_profile_len = ((*(profile ))<<24) | ((*(profile+1))<<16) |
((*(profile+2))<< 8) | ((*(profile+3)) );
if (profile_len < embedded_profile_len)
{
png_warning(png_ptr,
"Embedded profile length too large in iCCP chunk");
return;
}
if (profile_len > embedded_profile_len)
{
png_warning(png_ptr,
"Truncating profile to actual length in iCCP chunk");
profile_len = embedded_profile_len;
}
if (profile_len)
profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
PNG_COMPRESSION_TYPE_BASE, &comp);
profile_len = png_text_compress(png_ptr, profile,
(png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp);
/* make sure we include the NULL after the name and the compression type */
png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
@@ -782,8 +828,8 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
png_size_t name_len;
png_charp new_name;
png_byte entrybuf[10];
int entry_size = (spalette->depth == 8 ? 6 : 10);
int palette_size = entry_size * spalette->nentries;
png_size_t entry_size = (spalette->depth == 8 ? 6 : 10);
png_size_t palette_size = entry_size * spalette->nentries;
png_sPLT_entryp ep;
#ifdef PNG_NO_POINTER_INDEXING
int i;
@@ -799,7 +845,7 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
/* make sure we include the NULL after the name */
png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
(png_uint_32)(name_len + 2 + palette_size));
(png_uint_32)(name_len + 2 + palette_size));
png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);
@@ -807,45 +853,45 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
#ifndef PNG_NO_POINTER_INDEXING
for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++)
{
if (spalette->depth == 8)
{
entrybuf[0] = (png_byte)ep->red;
entrybuf[1] = (png_byte)ep->green;
entrybuf[2] = (png_byte)ep->blue;
entrybuf[3] = (png_byte)ep->alpha;
png_save_uint_16(entrybuf + 4, ep->frequency);
}
else
{
png_save_uint_16(entrybuf + 0, ep->red);
png_save_uint_16(entrybuf + 2, ep->green);
png_save_uint_16(entrybuf + 4, ep->blue);
png_save_uint_16(entrybuf + 6, ep->alpha);
png_save_uint_16(entrybuf + 8, ep->frequency);
}
png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
if (spalette->depth == 8)
{
entrybuf[0] = (png_byte)ep->red;
entrybuf[1] = (png_byte)ep->green;
entrybuf[2] = (png_byte)ep->blue;
entrybuf[3] = (png_byte)ep->alpha;
png_save_uint_16(entrybuf + 4, ep->frequency);
}
else
{
png_save_uint_16(entrybuf + 0, ep->red);
png_save_uint_16(entrybuf + 2, ep->green);
png_save_uint_16(entrybuf + 4, ep->blue);
png_save_uint_16(entrybuf + 6, ep->alpha);
png_save_uint_16(entrybuf + 8, ep->frequency);
}
png_write_chunk_data(png_ptr, entrybuf, entry_size);
}
#else
ep=spalette->entries;
for (i=0; i>spalette->nentries; i++)
{
if (spalette->depth == 8)
{
entrybuf[0] = (png_byte)ep[i].red;
entrybuf[1] = (png_byte)ep[i].green;
entrybuf[2] = (png_byte)ep[i].blue;
entrybuf[3] = (png_byte)ep[i].alpha;
png_save_uint_16(entrybuf + 4, ep[i].frequency);
}
else
{
png_save_uint_16(entrybuf + 0, ep[i].red);
png_save_uint_16(entrybuf + 2, ep[i].green);
png_save_uint_16(entrybuf + 4, ep[i].blue);
png_save_uint_16(entrybuf + 6, ep[i].alpha);
png_save_uint_16(entrybuf + 8, ep[i].frequency);
}
png_write_chunk_data(png_ptr, entrybuf, entry_size);
if (spalette->depth == 8)
{
entrybuf[0] = (png_byte)ep[i].red;
entrybuf[1] = (png_byte)ep[i].green;
entrybuf[2] = (png_byte)ep[i].blue;
entrybuf[3] = (png_byte)ep[i].alpha;
png_save_uint_16(entrybuf + 4, ep[i].frequency);
}
else
{
png_save_uint_16(entrybuf + 0, ep[i].red);
png_save_uint_16(entrybuf + 2, ep[i].green);
png_save_uint_16(entrybuf + 4, ep[i].blue);
png_save_uint_16(entrybuf + 6, ep[i].alpha);
png_save_uint_16(entrybuf + 8, ep[i].frequency);
}
png_write_chunk_data(png_ptr, entrybuf, entry_size);
}
#endif
@@ -970,7 +1016,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
itemp = (png_uint_32)(blue_y * 100000.0 + 0.5);
png_save_uint_32(buf + 28, itemp);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, 32);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
@@ -1023,7 +1069,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_save_uint_32(buf + 24, (png_uint_32)blue_x);
png_save_uint_32(buf + 28, (png_uint_32)blue_y);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, 32);
}
#endif
#endif
@@ -1048,7 +1094,8 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
return;
}
/* write the chunk out as it is */
png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, (png_size_t)num_trans);
png_write_chunk(png_ptr, (png_bytep)png_tRNS,
trans, (png_size_t)num_trans);
}
else if (color_type == PNG_COLOR_TYPE_GRAY)
{
@@ -1060,7 +1107,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
return;
}
png_save_uint_16(buf, tran->gray);
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, 2);
}
else if (color_type == PNG_COLOR_TYPE_RGB)
{
@@ -1069,12 +1116,12 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
png_save_uint_16(buf + 2, tran->green);
png_save_uint_16(buf + 4, tran->blue);
if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, 6);
}
else
{
@@ -1107,7 +1154,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
return;
}
buf[0] = back->index;
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1);
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, 1);
}
else if (color_type & PNG_COLOR_MASK_COLOR)
{
@@ -1115,12 +1162,12 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
png_save_uint_16(buf + 2, back->green);
png_save_uint_16(buf + 4, back->blue);
if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
{
png_warning(png_ptr,
"Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
return;
}
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, 6);
}
else
{
@@ -1131,7 +1178,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
return;
}
png_save_uint_16(buf, back->gray);
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, 2);
}
}
#endif
@@ -1156,11 +1203,12 @@ png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
return;
}
png_write_chunk_start(png_ptr, (png_bytep)png_hIST, (png_uint_32)(num_hist * 2));
png_write_chunk_start(png_ptr, (png_bytep)png_hIST,
(png_uint_32)(num_hist * 2));
for (i = 0; i < num_hist; i++)
{
png_save_uint_16(buf, hist[i]);
png_write_chunk_data(png_ptr, buf, (png_size_t)2);
png_write_chunk_data(png_ptr, buf, 2);
}
png_write_chunk_end(png_ptr);
}
@@ -1192,16 +1240,16 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
if (key == NULL || (key_len = png_strlen(key)) == 0)
{
png_warning(png_ptr, "zero length keyword");
return ((png_size_t)0);
return 0;
}
png_debug1(2, "Keyword to be checked is '%s'\n", key);
*new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2));
*new_key = (png_charp)png_malloc_warn(png_ptr, key_len + 2);
if (*new_key == NULL)
{
png_warning(png_ptr, "Out of memory while procesing keyword");
return ((png_size_t)0);
return 0;
}
/* Replace non-printing characters with a blank and print a warning */
@@ -1320,7 +1368,8 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
text_len = png_strlen(text);
/* make sure we include the 0 after the key */
png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
png_write_chunk_start(png_ptr, (png_bytep)png_tEXt,
(png_uint_32)key_len+text_len+1);
/*
* We leave it to the application to meet PNG-1.0 requirements on the
* contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
@@ -1366,7 +1415,7 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE)
{
png_write_tEXt(png_ptr, new_key, text, (png_size_t)0);
png_write_tEXt(png_ptr, new_key, text, 0);
png_free(png_ptr, new_key);
return;
}
@@ -1386,7 +1435,7 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1);
buf[0] = (png_byte)compression;
/* write compression */
png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
png_write_chunk_data(png_ptr, (png_bytep)buf, 1);
/* write the compressed data */
png_write_compressed_data_out(png_ptr, &comp);
@@ -1503,7 +1552,7 @@ png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
png_save_int_32(buf + 4, y_offset);
buf[8] = (png_byte)unit_type;
png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, 9);
}
#endif
@@ -1532,8 +1581,8 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
png_debug1(3, "pCAL units length = %d\n", (int)units_len);
total_len = purpose_len + units_len + 10;
params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
*png_sizeof(png_uint_32)));
params_len = (png_uint_32p)png_malloc(png_ptr,
(png_size_t)(nparams * sizeof(png_uint_32)));
/* Find the length of each parameter, making sure we don't count the
null terminator for the last parameter. */
@@ -1552,8 +1601,8 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
png_save_int_32(buf + 4, X1);
buf[8] = (png_byte)type;
buf[9] = (png_byte)nparams;
png_write_chunk_data(png_ptr, buf, (png_size_t)10);
png_write_chunk_data(png_ptr, (png_bytep)units, (png_size_t)units_len);
png_write_chunk_data(png_ptr, buf, 10);
png_write_chunk_data(png_ptr, (png_bytep)units, units_len);
png_free(png_ptr, new_purpose);
@@ -1645,7 +1694,7 @@ png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
png_save_uint_32(buf + 4, y_pixels_per_unit);
buf[8] = (png_byte)unit_type;
png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9);
png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, 9);
}
#endif
@@ -1677,7 +1726,7 @@ png_write_tIME(png_structp png_ptr, png_timep mod_time)
buf[5] = mod_time->minute;
buf[6] = mod_time->second;
png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7);
png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, 7);
}
#endif
@@ -1704,11 +1753,11 @@ png_write_start_row(png_structp png_ptr)
png_size_t buf_size;
png_debug(1, "in png_write_start_row\n");
buf_size = (png_size_t)(PNG_ROWBYTES(
png_ptr->usr_channels*png_ptr->usr_bit_depth,png_ptr->width)+1);
buf_size = (PNG_ROWBYTES(
png_ptr->usr_channels*png_ptr->usr_bit_depth, png_ptr->width) + 1);
/* set up row buffer */
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, buf_size);
png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
/* set up filtering buffer, if using this filter */
@@ -1723,12 +1772,12 @@ png_write_start_row(png_structp png_ptr)
if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
{
/* set up previous row buffer */
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, buf_size);
png_memset(png_ptr->prev_row, 0, buf_size);
if (png_ptr->do_filter & PNG_FILTER_UP)
{
png_ptr->up_row = (png_bytep )png_malloc(png_ptr,
png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
}
@@ -1742,7 +1791,7 @@ png_write_start_row(png_structp png_ptr)
if (png_ptr->do_filter & PNG_FILTER_PAETH)
{
png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
@@ -1841,8 +1890,8 @@ png_write_finish_row(png_structp png_ptr)
{
if (png_ptr->prev_row != NULL)
png_memset(png_ptr->prev_row, 0,
(png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels*
png_ptr->usr_bit_depth,png_ptr->width))+1);
(PNG_ROWBYTES(png_ptr->usr_channels*
png_ptr->usr_bit_depth, png_ptr->width)) + 1);
return;
}
}