libpng-1.6.26 is available

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libpng-1.6.26 is available from
ftp://ftp.simplesystems.org/pub/png/src/libpng16
and from
http://libpng.sf.net


Changes since the last public release (1.6.25):

  Fixed handling zero length IDAT in pngfix (bug report by Agostino Sarubbo,
    bugfix by John Bowler).
  Do not issue a png_error() on read in png_set_pCAL() because
png_handle_pCAL
    has allocated memory that libpng needs to free.
  Conditionally compile png_set_benign_errors() in pngread.c and pngtest.c
  Issue a png_benign_error instead of a png_error on ADLER32 mismatch
    while decoding compressed data chunks.
  Changed PNG_ZLIB_VERNUM to ZLIB_VERNUM in pngpriv.h, pngstruct.h, and
    pngrutil.c.
  If CRC handling of critical chunks has been set to PNG_CRC_QUIET_USE,
    ignore the ADLER32 checksum in the IDAT chunk as well as the chunk CRCs.
  Issue png_benign_error() on ADLER32 checksum mismatch instead of
png_error().
  Add tests/badcrc.png and tests/badadler.png to tests/pngtest.
  Merged pngtest.c with libpng-1.7.0beta84/pngtest.c
  Updated the documentation about CRC and ADLER32 handling.
  Quieted 117 warnings from clang-3.8 in pngtrans.c, pngread.c,
     pngwrite.c, pngunknown.c, and pngvalid.c.
  Quieted the 144 remaining -Wconversion compiler warnings by
    revising the png_isaligned() macro and trivial changes in png.c,
    pngerror.c, pngget.c, pngmem.c, pngset.c, pngrtran.c, pngrutil.c,
    pngwtran.c, pngwrite.c, and pngwutil.c.
  Quieted (bogus?) clang warnings about "absolute value has no effect"
    when PNG_USE_ABS is defined.
  Fixed offsets in contrib/intel/intel_sse.patch
  Changed integer constant 4294967294 to unsigned 4294967294U in pngconf.h
    to avoid a signed/unsigned compare in the preprocessor.
  Use zlib-1.2.8.1 inflateValidate() instead of inflateReset2() to
    optionally avoid ADLER32 evaluation.
  Cosmetic change, "ptr != 0" to "ptr != NULL" in png.c and pngrutil.c
  Despammed email addresses (replaced "@" with " at ").

Glenn

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<div dir=3D"ltr"><div><div><div>libpng-1.6.26 is available from<br></div><a=
 href=3D"ftp://ftp.simplesystems.org/pub/png/src/libpng16">ftp://ftp.simple=
systems.org/pub/png/src/libpng16</a><br></div>and from<br></div><a href=3D"=
http://libpng.sf.net">http://libpng.sf.net</a><br><div><div><div><br><br>Ch=
anges since the last public release (1.6.25):<br><br>=C2=A0 Fixed handling =
zero length IDAT in pngfix (bug report by Agostino Sarubbo,<br>=C2=A0=C2=A0=
=C2=A0 bugfix by John Bowler).<br>=C2=A0 Do not issue a png_error() on read=
 in png_set_pCAL() because png_handle_pCAL<br>=C2=A0=C2=A0=C2=A0 has alloca=
ted memory that libpng needs to free.<br>=C2=A0 Conditionally compile png_s=
et_benign_errors() in pngread.c and pngtest.c<br>=C2=A0 Issue a png_benign_=
error instead of a png_error on ADLER32 mismatch<br>=C2=A0=C2=A0=C2=A0 whil=
e decoding compressed data chunks.<br>=C2=A0 Changed PNG_ZLIB_VERNUM to ZLI=
B_VERNUM in pngpriv.h, pngstruct.h, and<br>=C2=A0=C2=A0=C2=A0 pngrutil.c.<b=
r>=C2=A0 If CRC handling of critical chunks has been set to PNG_CRC_QUIET_U=
SE,<br>=C2=A0=C2=A0=C2=A0 ignore the ADLER32 checksum in the IDAT chunk as =
well as the chunk CRCs.<br>=C2=A0 Issue png_benign_error() on ADLER32 check=
sum mismatch instead of png_error().<br>=C2=A0 Add tests/badcrc.png and tes=
ts/badadler.png to tests/pngtest.<br>=C2=A0 Merged pngtest.c with libpng-1.=
7.0beta84/pngtest.c<br>=C2=A0 Updated the documentation about CRC and ADLER=
32 handling.<br>=C2=A0 Quieted 117 warnings from clang-3.8 in pngtrans.c, p=
ngread.c,<br>=C2=A0=C2=A0=C2=A0=C2=A0 pngwrite.c, pngunknown.c, and pngvali=
d.c.<br>=C2=A0 Quieted the 144 remaining -Wconversion compiler warnings by<=
br>=C2=A0=C2=A0=C2=A0 revising the png_isaligned() macro and trivial change=
s in png.c,<br>=C2=A0=C2=A0=C2=A0 pngerror.c, pngget.c, pngmem.c, pngset.c,=
 pngrtran.c, pngrutil.c,<br>=C2=A0=C2=A0=C2=A0 pngwtran.c, pngwrite.c, and =
pngwutil.c.<br>=C2=A0 Quieted (bogus?) clang warnings about &quot;absolute =
value has no effect&quot;<br>=C2=A0=C2=A0=C2=A0 when PNG_USE_ABS is defined=
.<br>=C2=A0 Fixed offsets in contrib/intel/intel_sse.patch<br>=C2=A0 Change=
d integer constant 4294967294 to unsigned 4294967294U in pngconf.h<br>=C2=
=A0=C2=A0=C2=A0 to avoid a signed/unsigned compare in the preprocessor.<br>=
=C2=A0 Use zlib-1.2.8.1 inflateValidate() instead of inflateReset2() to<br>=
=C2=A0=C2=A0=C2=A0 optionally avoid ADLER32 evaluation.<br>=C2=A0 Cosmetic =
change, &quot;ptr !=3D 0&quot; to &quot;ptr !=3D NULL&quot; in png.c and pn=
grutil.c<br>=C2=A0 Despammed email addresses (replaced &quot;@&quot; with &=
quot; at &quot;).<br><br></div><div>Glenn<br></div></div></div></div>

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