mewin/libpng
1
0
Fork 0
mirror of https://git.code.sf.net/p/libpng/code.git synced 2025-07-10 18:04:09 +02:00
Code Issues Projects Releases Wiki Activity

Imported from libpng-1.2.13rc2.tar

Browse Source
This commit is contained in:
Glenn Randers-Pehrson
2006-11-13 14:14:21 -06:00
parent 2e3980e1de
commit e88a5eca8b
55 changed files with 1136 additions and 134 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
pngwutil.c
View File

@@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file
*
* Last changed in libpng 1.2.13 July 20, 2006
* Last changed in libpng 1.2.13 November 13, 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)
@@ -62,6 +62,7 @@ void PNGAPI
png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
png_bytep data, png_size_t length)
{
if(png_ptr == NULL) return;
png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
png_write_chunk_data(png_ptr, data, length);
png_write_chunk_end(png_ptr);
@@ -77,6 +78,7 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
{
png_byte buf[4];
png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name, length);
if(png_ptr == NULL) return;
/* write the length */
png_save_uint_32(buf, length);
@@ -98,6 +100,7 @@ void PNGAPI
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(png_ptr == NULL) return;
if (data != NULL && length > 0)
{
png_calculate_crc(png_ptr, data, length);
@@ -111,6 +114,8 @@ png_write_chunk_end(png_structp png_ptr)
{
png_byte buf[4];
if(png_ptr == NULL) return;
/* write the crc */
png_save_uint_32(buf, png_ptr->crc);