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Imported from pngcrush-1.5.9.tar

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This commit is contained in:
Glenn Randers-Pehrson
2002-07-08 19:10:41 -05:00
parent 2eb0852fd6
commit bfee24162a
23 changed files with 1214 additions and 443 deletions
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32
pngwutil.c
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@@ -1,9 +1,9 @@
/* pngwutil.c - utilities to write a PNG file
*
* libpng 1.2.1 - December 12, 2001
* libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2001 Glenn Randers-Pehrson
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
@@ -1349,22 +1349,28 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
png_warning(png_ptr, "Empty keyword in iTXt chunk");
return;
}
if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang,
&new_lang))==0)
if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
{
png_warning(png_ptr, "Empty language field in iTXt chunk");
return;
new_lang = NULL;
lang_len = 0;
}
lang_key_len = png_strlen(lang_key);
text_len = png_strlen(text);
if (text == NULL || *text == '\0')
if (lang_key == NULL)
lang_key_len = 0;
else
lang_key_len = png_strlen(lang_key);
if (text == NULL)
text_len = 0;
else
text_len = png_strlen(text);
/* compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression-2,
&comp);
/* make sure we include the compression flag, the compression byte,
* and the NULs after the key, lang, and lang_key parts */
@@ -1394,15 +1400,15 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
cbuf[1] = 0;
png_write_chunk_data(png_ptr, cbuf, 2);
png_write_chunk_data(png_ptr, (png_bytep)new_lang, lang_len + 1);
png_write_chunk_data(png_ptr, (png_bytep)lang_key, lang_key_len+1);
png_write_chunk_data(png_ptr, '\0', 1);
cbuf[0] = 0;
png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), lang_len + 1);
png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), lang_key_len + 1);
png_write_compressed_data_out(png_ptr, &comp);
png_write_chunk_end(png_ptr);
png_free(png_ptr, new_key);
png_free(png_ptr, new_lang);
if (new_lang)
png_free(png_ptr, new_lang);
}
#endif