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[libpng17] Reenabled code to allow zero length PLTE chunks for MNG.

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This commit is contained in:
John Bowler
2013-02-18 21:36:25 -06:00
committed by Glenn Randers-Pehrson
parent e3a526f789
commit 7363babe4f
3 changed files with 19 additions and 5 deletions
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16
pngset.c
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@@ -515,7 +515,7 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
png_debug1(1, "in %s storage function", "PLTE");
if (png_ptr == NULL || info_ptr == NULL || palette == NULL)
if (png_ptr == NULL || info_ptr == NULL)
return;
if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
@@ -530,6 +530,17 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
}
}
if ((num_palette > 0 && palette == NULL) ||
(num_palette == 0
# ifdef PNG_MNG_FEATURES_SUPPORTED
&& (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
# endif
))
{
png_chunk_report(png_ptr, "Invalid palette", PNG_CHUNK_ERROR);
return;
}
/* It may not actually be necessary to set png_ptr->palette here;
* we do it for backward compatibility with the way the png_handle_tRNS
* function used to do the allocation.
@@ -546,7 +557,8 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
if (num_palette > 0)
memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
info_ptr->palette = png_ptr->palette;
info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;