libpng-1.5.22 and 1.6.17 are available

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lippng-1.5.22 and 1.6.17 are available from
ftp://ftp.simplesystems.org/pub/png/src/
and from
http://libpng.sf.net

Libpng-1.5.22 Changes since the last public release (1.5.21):

  Regenerated configure scripts with libtool-2.4.4
  Made the check for out-of-range values in png_set_tRNS() detect
    values that are exactly 2^bit_depth, and work on 16-bit platforms.
  Quieted some warnings from Coverity-scan.
  Merged pngtest.c with libpng-1.6.17/pngtest.c
  Display user limits in the output from pngtest.
  Eliminated the PNG_SAFE_LIMITS macro and restored the 1-million-column
    and 1-million-row default limits in pnglibconf.dfa, that can be reset
    by the user at build time or run time.  This provides a more robust
    defense against DOS and as-yet undiscovered overflows.
  Added PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.
  Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
  Rebuilt configure scripts with automake-1.15 and libtool-2.4.6
  Removed some comments that the configure script did not handle
    properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
  Merged png_free_data() with libpng-1.6.17
  Updated CMakeLists.txt to add OSX framework, change YES/NO to ON/OFF
    for consistency, and remove some useless tests (Alexey Petruchik).
  Remove pnglibconf.h, pnglibconf.c, and pnglibconf.out instead of
    pnglibconf.* in "make clean" (Cosmin).
  Fix incorrect calculation of maximum number of unknown chunks or
    sPLT chunks to be stored (John Bowler).

Libpng-1.6.17 Changes since the last public release (1.6.16):

  Removed duplicate PNG_SAFE_LIMITS_SUPPORTED handling from pngconf.h
  Corrected the width limit calculation in png_check_IHDR().
  Removed user limits from pngfix. Also pass NULL pointers to
    png_read_row to skip the unnecessary row de-interlace stuff.
  Added testing of png_set_packing() to pngvalid.c
  Regenerated configure scripts in the *.tar distributions with
libtool-2.4.4
  Implement previously untested cases of libpng transforms in pngvalid.c
  Fixed byte order in 2-byte filler, in png_do_read_filler().
  Made the check for out-of-range values in png_set_tRNS() detect
    values that are exactly 2^bit_depth, and work on 16-bit platforms.
  Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
  Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
    pngset.c to avoid warnings about dead code.
  Do not build png_product2() when it is unused.
  Display user limits in the output from pngtest.
  Eliminated the PNG_SAFE_LIMITS macro and restored the 1-million-column
    and 1-million-row default limits in pnglibconf.dfa, that can be reset
    by the user at build time or run time.  This provides a more robust
    defense against DOS and as-yet undiscovered overflows.
  Added PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.
  Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
  Rebuilt configure scripts with automake-1.15 and libtool-2.4.6
  Moved png_set_filter() prototype into a PNG_WRITE_SUPPORTED block
    of png.h.
  Avoid runtime checks when converting integer to png_byte with
    Visual Studio (Sergey Kosarevsky)
  Removed some comments that the configure script did not handle
    properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
  Free the unknown_chunks structure even when it contains no data.
  Updated CMakeLists.txt to add OSX framework, change YES/NO to ON/OFF
    for consistency, and remove some useless tests (Alexey Petruchik).
  Remove pnglibconf.h, pnglibconf.c, pnglibconf.pre, pnglibconf.dfn,
    and pnglibconf.out instead of pnglibconf.* in "make clean" (Cosmin).
  Fixed simplified 8-bit-linear to sRGB alpha. The calculated alpha
    value was wrong.  It's not clear if this affected the final stored
    value; in the obvious code path the upper and lower 8-bits of the
    alpha value were identical and the alpha was truncated to 8-bits
    rather than dividing by 257 (John Bowler).

Glenn

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<div dir=3D"ltr"><div><div><div>lippng-1.5.22 and 1.6.17 are available from=
<br></div><a href=3D"ftp://ftp.simplesystems.org/pub/png/src/">ftp://ftp.si=
mplesystems.org/pub/png/src/</a><br></div>and from<br></div><a href=3D"http=
://libpng.sf.net">http://libpng.sf.net</a><br><br>Libpng-1.5.22 Changes sin=
ce the last public release (1.5.21):<br><br>=C2=A0 Regenerated configure sc=
ripts with libtool-2.4.4<br>=C2=A0 Made the check for out-of-range values i=
n png_set_tRNS() detect<br>=C2=A0=C2=A0=C2=A0 values that are exactly 2^bit=
_depth, and work on 16-bit platforms.<br>=C2=A0 Quieted some warnings from =
Coverity-scan.<br>=C2=A0 Merged pngtest.c with libpng-1.6.17/pngtest.c<br>=
=C2=A0 Display user limits in the output from pngtest.<br>=C2=A0 Eliminated=
 the PNG_SAFE_LIMITS macro and restored the 1-million-column<br>=C2=A0=C2=
=A0=C2=A0 and 1-million-row default limits in pnglibconf.dfa, that can be r=
eset<br>=C2=A0=C2=A0=C2=A0 by the user at build time or run time.=C2=A0 Thi=
s provides a more robust<br>=C2=A0=C2=A0=C2=A0 defense against DOS and as-y=
et undiscovered overflows.<br>=C2=A0 Added PNG_WRITE_CUSTOMIZE_COMPRESSION_=
SUPPORTED macro, on by default.<br>=C2=A0 Allow user to call png_get_IHDR()=
 with NULL arguments (Reuben Hawkins).<br>=C2=A0 Rebuilt configure scripts =
with automake-1.15 and libtool-2.4.6<br>=C2=A0 Removed some comments that t=
he configure script did not handle<br>=C2=A0=C2=A0=C2=A0 properly from scri=
pts/pnglibconf.dfa and pnglibconf.h.prebuilt.<br>=C2=A0 Merged png_free_dat=
a() with libpng-1.6.17<br>=C2=A0 Updated CMakeLists.txt to add OSX framewor=
k, change YES/NO to ON/OFF<br>=C2=A0=C2=A0=C2=A0 for consistency, and remov=
e some useless tests (Alexey Petruchik).<br>=C2=A0 Remove pnglibconf.h, png=
libconf.c, and pnglibconf.out instead of<br>=C2=A0=C2=A0=C2=A0 pnglibconf.*=
 in &quot;make clean&quot; (Cosmin).<br>=C2=A0 Fix incorrect calculation of=
 maximum number of unknown chunks or<br>=C2=A0=C2=A0=C2=A0 sPLT chunks to b=
e stored (John Bowler).<br><br><div><div><div><div>Libpng-1.6.17 Changes si=
nce the last public release (1.6.16):<br><br>=C2=A0 Removed duplicate PNG_S=
AFE_LIMITS_SUPPORTED handling from pngconf.h<br>=C2=A0 Corrected the width =
limit calculation in png_check_IHDR().<br>=C2=A0 Removed user limits from p=
ngfix. Also pass NULL pointers to<br>=C2=A0=C2=A0=C2=A0 png_read_row to ski=
p the unnecessary row de-interlace stuff.<br>=C2=A0 Added testing of png_se=
t_packing() to pngvalid.c<br>=C2=A0 Regenerated configure scripts in the *.=
tar distributions with libtool-2.4.4<br>=C2=A0 Implement previously unteste=
d cases of libpng transforms in pngvalid.c<br>=C2=A0 Fixed byte order in 2-=
byte filler, in png_do_read_filler().<br>=C2=A0 Made the check for out-of-r=
ange values in png_set_tRNS() detect<br>=C2=A0=C2=A0=C2=A0 values that are =
exactly 2^bit_depth, and work on 16-bit platforms.<br>=C2=A0 Merged some pa=
rts of libpng-1.6.17beta01 and libpng-1.7.0beta47.<br>=C2=A0 Added #ifndef =
__COVERITY__ where needed in png.c, pngrutil.c and<br>=C2=A0=C2=A0=C2=A0 pn=
gset.c to avoid warnings about dead code.<br>=C2=A0 Do not build png_produc=
t2() when it is unused.<br>=C2=A0 Display user limits in the output from pn=
gtest.<br>=C2=A0 Eliminated the PNG_SAFE_LIMITS macro and restored the 1-mi=
llion-column<br>=C2=A0=C2=A0=C2=A0 and 1-million-row default limits in pngl=
ibconf.dfa, that can be reset<br>=C2=A0=C2=A0=C2=A0 by the user at build ti=
me or run time.=C2=A0 This provides a more robust<br>=C2=A0=C2=A0=C2=A0 def=
ense against DOS and as-yet undiscovered overflows.<br>=C2=A0 Added PNG_WRI=
TE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.<br>=C2=A0 Allow us=
er to call png_get_IHDR() with NULL arguments (Reuben Hawkins).<br>=C2=A0 R=
ebuilt configure scripts with automake-1.15 and libtool-2.4.6<br>=C2=A0 Mov=
ed png_set_filter() prototype into a PNG_WRITE_SUPPORTED block<br>=C2=A0=C2=
=A0=C2=A0 of png.h.<br>=C2=A0 Avoid runtime checks when converting integer =
to png_byte with<br>=C2=A0=C2=A0=C2=A0 Visual Studio (Sergey Kosarevsky)<br=
>=C2=A0 Removed some comments that the configure script did not handle<br>=
=C2=A0=C2=A0=C2=A0 properly from scripts/pnglibconf.dfa and pnglibconf.h.pr=
ebuilt.<br>=C2=A0 Free the unknown_chunks structure even when it contains n=
o data.<br>=C2=A0 Updated CMakeLists.txt to add OSX framework, change YES/N=
O to ON/OFF<br>=C2=A0=C2=A0=C2=A0 for consistency, and remove some useless =
tests (Alexey Petruchik).<br>=C2=A0 Remove pnglibconf.h, pnglibconf.c, pngl=
ibconf.pre, pnglibconf.dfn,<br>=C2=A0=C2=A0=C2=A0 and pnglibconf.out instea=
d of pnglibconf.* in &quot;make clean&quot; (Cosmin).<br>=C2=A0 Fixed simpl=
ified 8-bit-linear to sRGB alpha. The calculated alpha<br>=C2=A0=C2=A0=C2=
=A0 value was wrong.=C2=A0 It&#39;s not clear if this affected the final st=
ored<br>=C2=A0=C2=A0=C2=A0 value; in the obvious code path the upper and lo=
wer 8-bits of the<br>=C2=A0=C2=A0=C2=A0 alpha value were identical and the =
alpha was truncated to 8-bits<br>=C2=A0=C2=A0=C2=A0 rather than dividing by=
 257 (John Bowler).<br><br></div><div>Glenn<br></div></div></div></div></di=
v>

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