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Imported from libpng-1.0.4-pre1.tar

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This commit is contained in:
Glenn Randers-Pehrson
1999-09-17 12:27:26 -05:00
parent 87544ac62b
commit 4393a9ad6b
56 changed files with 5798 additions and 1904 deletions
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40
pngwutil.c
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@@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file
*
* libpng 1.0.3 - January 14, 1999
* libpng 1.0.4 - September 17, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
@@ -284,17 +284,21 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
png_byte buf[3];
png_debug(1, "in png_write_PLTE\n");
if (num_pal == 0 || num_pal > 256)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_error(png_ptr, "Invalid number of colors in palette");
}
else
{
png_warning(png_ptr, "Invalid number of colors in palette");
return;
}
if ((
#ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
!png_ptr->empty_plte_permitted &&
#endif
num_pal == 0) || num_pal > 256)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_error(png_ptr, "Invalid number of colors in palette");
}
else
{
png_warning(png_ptr, "Invalid number of colors in palette");
return;
}
}
png_ptr->num_palette = (png_uint_16)num_pal;
@@ -524,7 +528,12 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
png_debug(1, "in png_write_bKGD\n");
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
if (back->index > png_ptr->num_palette)
if (
#ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
(!png_ptr->empty_plte_permitted ||
(png_ptr->empty_plte_permitted && png_ptr->num_palette)) &&
#endif
back->index > png_ptr->num_palette)
{
png_warning(png_ptr, "Invalid background palette index");
return;
@@ -713,6 +722,11 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
/* make sure we include the 0 after the key */
png_write_chunk_start(png_ptr, 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
* any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
*/
png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
if (text_len)
png_write_chunk_data(png_ptr, (png_bytep)text, text_len);