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Fix write problem with reduced size IDAT chunks

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png_set_compression_buffer_size would result in a spurious debug assert if the
compression buffer size was set to something other than a multiple of
PNG_ROW_BUFFER_SIZE; the debug test failed to add the buffer 'start'

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler 2016-01-10 13:49:34 -08:00
parent 79378d49b3
commit e393f19527
1 changed files with 2 additions and 2 deletions
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4
pngwutil.c
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@ -2363,7 +2363,8 @@ png_write_IDAT(png_structrp png_ptr, int flush)
else /* not end of list */ else /* not end of list */
debug((ps->s.zs.next_out < next->output || debug((ps->s.zs.next_out < next->output ||
ps->s.zs.next_out > next->output + sizeof next->output) && ps->s.zs.next_out > next->output + sizeof next->output) &&
(ps->s.overflow > 0 || ps->s.len >= sizeof next->output)); (ps->s.overflow > 0 ||
ps->s.start + ps->s.len >= sizeof next->output));
/* First, if this is the very first IDAT (PNG_HAVE_IDAT not set) /* First, if this is the very first IDAT (PNG_HAVE_IDAT not set)
* optimize the CINFO field: * optimize the CINFO field:
@ -2419,7 +2420,6 @@ png_write_IDAT(png_structrp png_ptr, int flush)
written = len; written = len;
png_write_chunk_data(png_ptr, next->output+start, written); png_write_chunk_data(png_ptr, next->output+start, written);
ps->s.start = (unsigned int)/*SAFE*/(start + written); ps->s.start = (unsigned int)/*SAFE*/(start + written);
UNTESTED
} }
/* 'written' bytes were written: */ /* 'written' bytes were written: */