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[devel] IDAT compression failed if preceded by a compressed text chunk

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This was because the attempt to reset the zlib stream in png_write_IDAT
happened after the first IDAT chunk had been deflated - much too late.
In this change internal functions are added to claim/release the z_stream
and, hopefully, make the code more robust.  Also deflateEnd checking is
added - previously libpng would ignore an error at the end of the stream.
This commit is contained in:
John Bowler
2011-05-05 17:35:39 -05:00
committed by Glenn Randers-Pehrson
parent c559bb58ed
commit c5bef946b1
9 changed files with 203 additions and 104 deletions
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scripts/pnglibconf.dfa
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@@ -553,6 +553,7 @@ option SAVE_INT_32 requires WRITE
# added at libpng-1.5.3
option WRITE_OPTIMIZE_CMF requires WRITE
option READ_COMPRESSED_TEXT disabled
option READ_iCCP enables READ_COMPRESSED_TEXT
option READ_iTXt enables READ_COMPRESSED_TEXT
option READ_zTXt enables READ_COMPRESSED_TEXT
@@ -561,6 +562,7 @@ option READ_COMPRESSED_TEXT enables READ_TEXT
option WRITE_oFFs enables SAVE_INT_32
option WRITE_pCAL enables SAVE_INT_32
option WRITE_COMPRESSED_TEXT disabled
option WRITE_iCCP enables WRITE_COMPRESSED_TEXT
option WRITE_iTXt enables WRITE_COMPRESSED_TEXT
option WRITE_zTXt enables WRITE_COMPRESSED_TEXT