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[libpng17] Added byte, short and other overflow checking

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Added 'assert' based overflow checking for debug builds for char
and short assignments. Simply ignore the error in release builds
(a truncated value will be used without warning). Controlled by
PNG_RANGE_CHECK_SUPPORTED.
This commit is contained in:
John Bowler
2015-03-22 15:57:53 -05:00
committed by Glenn Randers-Pehrson
parent 382de60042
commit 82fa6aed0e
14 changed files with 618 additions and 508 deletions
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23
pngtrans.c
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@@ -273,10 +273,7 @@ png_do_invert(png_row_infop row_info, png_bytep row)
png_size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i++)
{
*rp = (png_byte)((~(*rp)) & 0xff);
rp++;
}
*rp++ ^= 0xff;
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
@@ -287,10 +284,7 @@ png_do_invert(png_row_infop row_info, png_bytep row)
png_size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 2)
{
*rp = (png_byte)((~(*rp)) & 0xff);
rp += 2;
}
*rp ^= 0xff, rp += 2;
}
#ifdef PNG_16BIT_SUPPORTED
@@ -302,11 +296,7 @@ png_do_invert(png_row_infop row_info, png_bytep row)
png_size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 4)
{
*rp = (png_byte)((~(*rp)) & 0xff);
*(rp + 1) = (png_byte)((~(*(rp + 1))) & 0xff);
rp += 4;
}
*rp++ ^= 0xff, *rp++ ^= 0xff, rp += 2;
}
#endif
}
@@ -804,9 +794,10 @@ png_set_user_transform_info(png_structrp png_ptr, png_voidp
#endif
png_ptr->user_transform_ptr = user_transform_ptr;
png_ptr->user_transform_depth = (png_byte)(user_transform_depth & 0xff);
png_ptr->user_transform_channels =
(png_byte)(user_transform_channels & 0xff);
png_ptr->user_transform_depth = png_check_byte(png_ptr,
user_transform_depth);
png_ptr->user_transform_channels = png_check_byte(png_ptr,
user_transform_channels);
}
#endif