libpng-1.5.27 and 1.6.22 are available

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libpng-1.5.27 and 1.6.22 are available from
ftp://ftp.simplesystems.org/pub/png/src/
and from
http://lbpng.sf.net

Version 1.5.27:
  Removed LE/BE dependencies in pngvalid, to 'fix' the current problem
    in the BigEndian tests by not testing it, making the BE code the same
    as the LE version.
  Fixes to pngvalid for various reduced build configurations (eliminate
unused
    statics) and a fix for the case in rgb_to_gray when the digitize option
    reduces graylo to 0, producing a large error.
  Widened the 'limit' check on the internally calculated error limits in
    the 'DIGITIZE' case (the code used prior to 1.7 for rgb_to_gray error
    checks) and changed the check to only operate in non-release builds
   (base build type not RC or RELEASE.)
  Fixed undefined behavior in pngvalid.c, undefined because
    (png_byte) << shift is undefined if it changes the signed bit
    (because png_byte is promoted to int). The libpng exported functions
    png_get_uint_32 and png_get_uint_16 handle this. (Bug reported by
    David Drysdale as a result of reports from UBSAN in clang 3.8).
  This changes pngvalid to use BE random numbers; this used to produce
    errors but these should not be fixed as a result of the previous
changes.
  In projects/vstudio, combined readme.txt and WARNING into README.txt
  Worked around a false-positive Coverity issue in pngvalid.c.
  Only use exit(77) from pngvalid.c in configure builds.
  Updated CMakeLists.txt, added supporting scripts/gen*.cmake.in
    and test.cmake.in (Roger Leigh).
  Added a common-law trademark notice and export control information
    to the LICENSE file, png.h, and the man page.
  Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to 0xnnnnU in png.h
    (Robert C. Seacord).
  Fixed some misleading indentation in pngvalid.c (Krishnaraj Bhat).
  Fixed typo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORTED
    Bug report by (Y.Ohashik).
  Added PNG_FAST_FILTERS macro (defined as
    PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_UP).

Version 1.6.22
  Changed PNG_USE_MKSTEMP to __COVERITY__ to select alternate
    "tmpfile()" implementation in contrib/libtests/pngstest.c
  Fixed NO_STDIO build of pngunknown.c to skip calling png_init_io()
    if there is no stdio.h support.
  Added a png_image_write_to_memory() API and a number of assist macros
    to allow an application that uses the simplified API write to bypass
    stdio and write directly to memory.
  Added some warnings (png.h) and some check code to detect *possible*
    overflow in the ROW_STRIDE and simplified image SIZE macros.  This
    disallows image width/height/format that *might* overflow.  This is
    a quiet API change that limits in-memory image size (uncompressed) to
    less than 4GByte and image row size (stride) to less than 2GByte.
  Revised workaround for false-positive Coverity issue in pngvalid.c.
  Only use exit(77) in configure builds.
  Updated CMakeLists.txt, added supporting scripts/gen*.cmake.in
    and test.cmake.in (Roger Leigh).
  Relaxed limit checks on gamma values in pngrtran.c. As suggested in
    the comments gamma values outside the range currently permitted
    by png_set_alpha_mode are useful for HDR data encoding.  These values
    are already permitted by png_set_gamma so it is reasonable caution to
    extend the png_set_alpha_mode range as HDR imaging systems are starting
    to emerge.
  Added a common-law trademark notice and export control information
    to the LICENSE file, png.h, and the man page.
  Restored "& 0xff" in png_save_uint_16() and png_save_uint_32() that
    were accidentally removed from libpng-1.6.17.
  Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to 0xnnnnU in png.h
    (Robert C. Seacord).
  Removed dubious "#if INT_MAX" test from png.h that was added to
    libpng-1.6.19 (John Bowler).
  Add ${INCLUDES} in scripts/genout.cmake.in (Bug report by Nixon Kwok).
  Updated LICENSE to say files in the contrib directory are not
    necessarily under the libpng license, and that some makefiles have
    other copyright owners.
  Added INTEL-SSE2 support (Mike Klein and Matt Sarett, Google, Inc.).
  Made contrib/libtests/timepng more robust.  The code no longer gives
    up/fails on invalid PNG data, it just skips it (with error messages).
    The code no longer fails on PNG files with data beyond IEND.  Options
    exist to use png_read_png (reading the whole image, not by row) and, in
    that case, to apply any of the supported transforms.  This makes for
    more realistic testing; the decoded data actually gets used in a
    meaningful fashion (John Bowler).
  Fixed some misleading indentation (Krishnaraj Bhat).
  Force GCC compilation to C89 if needed (Dagobert Michelsen).
  SSE filter speed improvements for bpp=3:
    memcpy-free implementations of load3() / store3().
    call load3() only when needed at the end of a scanline.
  Added PNG_FAST_FILTERS macro (defined as
    PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_UP).
  Various fixes for contrib/libtests/timepng.c
  Fixed typo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORTED
    (Bug report by Y.Ohashik).
  Quieted two Coverity issues in contrib/libtests/timepng.c.
  Fixed issues with scripts/genout.cmake.in (David Capello, Nixon Kwok):
    Added support to use multiple directories in ZLIBINCDIR variable,
    Fixed CMAKE_C_FLAGS with multiple values when genout is compiled on
MSVC,
    Fixed pnglibconf.c compilation on OS X including the sysroot path.
  Check for CLOCK_PROCESS_CPUTIME_ID when building
/contrib/libtests/timepng.
  Check for the presence of clock_gettime() in configure.ac and Makefile.am.

Glenn

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<div dir=3D"ltr"><div><div><div><div>libpng-1.5.27 and 1.6.22 are available=
 from<br></div><a href=3D"ftp://ftp.simplesystems.org/pub/png/src/">ftp://f=
tp.simplesystems.org/pub/png/src/</a><br></div>and from<br></div><a href=3D=
"http://lbpng.sf.net">http://lbpng.sf.net</a><br><br>Version 1.5.27:<br>=C2=
=A0 Removed LE/BE dependencies in pngvalid, to &#39;fix&#39; the current pr=
oblem<br>=C2=A0=C2=A0=C2=A0 in the BigEndian tests by not testing it, makin=
g the BE code the same <br>=C2=A0=C2=A0=C2=A0 as the LE version.<br>=C2=A0 =
Fixes to pngvalid for various reduced build configurations (eliminate unuse=
d<br>=C2=A0=C2=A0=C2=A0 statics) and a fix for the case in rgb_to_gray when=
 the digitize option<br>=C2=A0=C2=A0=C2=A0 reduces graylo to 0, producing a=
 large error.<br>=C2=A0 Widened the &#39;limit&#39; check on the internally=
 calculated error limits in<br>=C2=A0=C2=A0=C2=A0 the &#39;DIGITIZE&#39; ca=
se (the code used prior to 1.7 for rgb_to_gray error<br>=C2=A0=C2=A0=C2=A0 =
checks) and changed the check to only operate in non-release builds<br>=C2=
=A0=C2=A0 (base build type not RC or RELEASE.)<br>=C2=A0 Fixed undefined be=
havior in pngvalid.c, undefined because<br>=C2=A0=C2=A0=C2=A0 (png_byte) &l=
t;&lt; shift is undefined if it changes the signed bit<br>=C2=A0=C2=A0=C2=
=A0 (because png_byte is promoted to int). The libpng exported functions<br=
>=C2=A0=C2=A0=C2=A0 png_get_uint_32 and png_get_uint_16 handle this. (Bug r=
eported by<br>=C2=A0=C2=A0=C2=A0 David Drysdale as a result of reports from=
 UBSAN in clang 3.8).<br>=C2=A0 This changes pngvalid to use BE random numb=
ers; this used to produce<br>=C2=A0=C2=A0=C2=A0 errors but these should not=
 be fixed as a result of the previous changes.<br>=C2=A0 In projects/vstudi=
o, combined readme.txt and WARNING into README.txt<br>=C2=A0 Worked around =
a false-positive Coverity issue in pngvalid.c.<br>=C2=A0 Only use exit(77) =
from pngvalid.c in configure builds.<br>=C2=A0 Updated CMakeLists.txt, adde=
d supporting scripts/gen*.<a href=3D"http://cmake.in">cmake.in</a><br>=C2=
=A0=C2=A0=C2=A0 and <a href=3D"http://test.cmake.in">test.cmake.in</a> (Rog=
er Leigh).<br>=C2=A0 Added a common-law trademark notice and export control=
 information<br>=C2=A0=C2=A0=C2=A0 to the LICENSE file, png.h, and the man =
page.<br>=C2=A0 Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to 0xnn=
nnU in png.h<br>=C2=A0=C2=A0=C2=A0 (Robert C. Seacord).<br>=C2=A0 Fixed som=
e misleading indentation in pngvalid.c (Krishnaraj Bhat).<br>=C2=A0 Fixed t=
ypo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORTED<br>=C2=A0=C2=
=A0=C2=A0 Bug report by (Y.Ohashik).<br>=C2=A0 Added PNG_FAST_FILTERS macro=
 (defined as<br>=C2=A0=C2=A0=C2=A0 PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTE=
R_UP).<br><br>Version 1.6.22<br>=C2=A0 Changed PNG_USE_MKSTEMP to __COVERIT=
Y__ to select alternate<br>=C2=A0=C2=A0=C2=A0 &quot;tmpfile()&quot; impleme=
ntation in contrib/libtests/pngstest.c<br>=C2=A0 Fixed NO_STDIO build of pn=
gunknown.c to skip calling png_init_io()<br>=C2=A0=C2=A0=C2=A0 if there is =
no stdio.h support.<br>=C2=A0 Added a png_image_write_to_memory() API and a=
 number of assist macros<br>=C2=A0=C2=A0=C2=A0 to allow an application that=
 uses the simplified API write to bypass<br>=C2=A0=C2=A0=C2=A0 stdio and wr=
ite directly to memory.<br>=C2=A0 Added some warnings (png.h) and some chec=
k code to detect *possible*<br>=C2=A0=C2=A0=C2=A0 overflow in the ROW_STRID=
E and simplified image SIZE macros.=C2=A0 This<br>=C2=A0=C2=A0=C2=A0 disall=
ows image width/height/format that *might* overflow.=C2=A0 This is<br>=C2=
=A0=C2=A0=C2=A0 a quiet API change that limits in-memory image size (uncomp=
ressed) to<br>=C2=A0=C2=A0=C2=A0 less than 4GByte and image row size (strid=
e) to less than 2GByte.<br>=C2=A0 Revised workaround for false-positive Cov=
erity issue in pngvalid.c.<br>=C2=A0 Only use exit(77) in configure builds.=
<br>=C2=A0 Updated CMakeLists.txt, added supporting scripts/gen*.<a href=3D=
"http://cmake.in">cmake.in</a><br>=C2=A0=C2=A0=C2=A0 and <a href=3D"http://=
test.cmake.in">test.cmake.in</a> (Roger Leigh).<br>=C2=A0 Relaxed limit che=
cks on gamma values in pngrtran.c. As suggested in<br>=C2=A0=C2=A0=C2=A0 th=
e comments gamma values outside the range currently permitted<br>=C2=A0=C2=
=A0=C2=A0 by png_set_alpha_mode are useful for HDR data encoding.=C2=A0 The=
se values<br>=C2=A0=C2=A0=C2=A0 are already permitted by png_set_gamma so i=
t is reasonable caution to<br>=C2=A0=C2=A0=C2=A0 extend the png_set_alpha_m=
ode range as HDR imaging systems are starting<br>=C2=A0=C2=A0=C2=A0 to emer=
ge.<br>=C2=A0 Added a common-law trademark notice and export control inform=
ation<br>=C2=A0=C2=A0=C2=A0 to the LICENSE file, png.h, and the man page.<b=
r>=C2=A0 Restored &quot;&amp; 0xff&quot; in png_save_uint_16() and png_save=
_uint_32() that<br>=C2=A0=C2=A0=C2=A0 were accidentally removed from libpng=
-1.6.17. <br>=C2=A0 Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to =
0xnnnnU in png.h<br>=C2=A0=C2=A0=C2=A0 (Robert C. Seacord).<br>=C2=A0 Remov=
ed dubious &quot;#if INT_MAX&quot; test from png.h that was added to<br>=C2=
=A0=C2=A0=C2=A0 libpng-1.6.19 (John Bowler).<br>=C2=A0 Add ${INCLUDES} in s=
cripts/<a href=3D"http://genout.cmake.in">genout.cmake.in</a> (Bug report b=
y Nixon Kwok).<br>=C2=A0 Updated LICENSE to say files in the contrib direct=
ory are not<br>=C2=A0=C2=A0=C2=A0 necessarily under the libpng license, and=
 that some makefiles have<br>=C2=A0=C2=A0=C2=A0 other copyright owners.<br>=
=C2=A0 Added INTEL-SSE2 support (Mike Klein and Matt Sarett, Google, Inc.).=
<br>=C2=A0 Made contrib/libtests/timepng more robust.=C2=A0 The code no lon=
ger gives<br>=C2=A0=C2=A0=C2=A0 up/fails on invalid PNG data, it just skips=
 it (with error messages).<br>=C2=A0=C2=A0=C2=A0 The code no longer fails o=
n PNG files with data beyond IEND.=C2=A0 Options<br>=C2=A0=C2=A0=C2=A0 exis=
t to use png_read_png (reading the whole image, not by row) and, in<br>=C2=
=A0=C2=A0=C2=A0 that case, to apply any of the supported transforms.=C2=A0 =
This makes for<br>=C2=A0=C2=A0=C2=A0 more realistic testing; the decoded da=
ta actually gets used in a<br>=C2=A0=C2=A0=C2=A0 meaningful fashion (John B=
owler).<br>=C2=A0 Fixed some misleading indentation (Krishnaraj Bhat).<br>=
=C2=A0 Force GCC compilation to C89 if needed (Dagobert Michelsen).<br>=C2=
=A0 SSE filter speed improvements for bpp=3D3:<br>=C2=A0=C2=A0=C2=A0 memcpy=
-free implementations of load3() / store3().<br>=C2=A0=C2=A0=C2=A0 call loa=
d3() only when needed at the end of a scanline.<br>=C2=A0 Added PNG_FAST_FI=
LTERS macro (defined as<br>=C2=A0=C2=A0=C2=A0 PNG_FILTER_NONE|PNG_FILTER_SU=
B|PNG_FILTER_UP).<br>=C2=A0 Various fixes for contrib/libtests/timepng.c<br=
>=C2=A0 Fixed typo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORT=
ED<br>=C2=A0=C2=A0=C2=A0 (Bug report by Y.Ohashik).<br>=C2=A0 Quieted two C=
overity issues in contrib/libtests/timepng.c.<br>=C2=A0 Fixed issues with s=
cripts/<a href=3D"http://genout.cmake.in">genout.cmake.in</a> (David Capell=
o, Nixon Kwok):<br>=C2=A0=C2=A0=C2=A0 Added support to use multiple directo=
ries in ZLIBINCDIR variable,<br>=C2=A0=C2=A0=C2=A0 Fixed CMAKE_C_FLAGS with=
 multiple values when genout is compiled on MSVC,<br>=C2=A0=C2=A0=C2=A0 Fix=
ed pnglibconf.c compilation on OS X including the sysroot path.<br>=C2=A0 C=
heck for CLOCK_PROCESS_CPUTIME_ID when building /contrib/libtests/timepng.<=
br>=C2=A0 Check for the presence of clock_gettime() in <a href=3D"http://co=
nfigure.ac">configure.ac</a> and Makefile.am.<br><br></div>Glenn<br><div><d=
iv><br></div></div></div>

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