[libpng16] Imported from libpng-1.6.4.tar

filter is found.

ANNOUNCE

@@ -1,109 +1,35 @@
 
-Libpng 1.6.3beta08 - June 18, 2013
+Libpng 1.6.4 - September 12, 2013
 
-This is not intended to be a public release.  It will be replaced
+This is a public release of libpng, intended for use in production codes.
-within a few weeks by a public version or by another test version.
 
 Files available for download:
 
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.3beta08.tar.xz (LZMA-compressed, recommended)
+   libpng-1.6.4.tar.xz (LZMA-compressed, recommended)
-   1.6.3beta08.tar.gz
+   libpng-1.6.4.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp163b08.7z  (LZMA-compressed, recommended)
+   lpng164.7z  (LZMA-compressed, recommended)
-   lp163b08.zip
+   lpng164.zip
 
 Other information:
 
-   1.6.3beta08-README.txt
+   libpng-1.6.4-README.txt
-   1.6.3beta08-LICENSE.txt
+   libpng-1.6.4-LICENSE.txt
+   Gnupg/*.asc (PGP armored detached signatures)
 
-Changes since the last public release (1.6.2):
+Changes since the last public release (1.6.3):
-
+  Added information about png_set_options() to the manual.
-Version 1.6.3beta01 [April 25, 2013]
+  Delay calling png_init_filter_functions() until a row with nonzero filter
-  Revised stack marking in arm/filter_neon.S and configure.ac.
+    is found.
-  Ensure that NEON filter stuff is completely disabled when switched 'off'.
+  Fixed inconsistent conditional compilation of png_chunk_unknown_handling()
-    Previously the ARM NEON specific files were still built if the option
+    prototype, definition, and usage.  Made it depend on
-    was switched 'off' as opposed to being explicitly disabled.
+    PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere.
-
-Version 1.6.3beta02 [April 26, 2013]
-  Test for 'arm*' not just 'arm' in the host_cpu configure variable.
-  Rebuilt the configure scripts.
-
-Version 1.6.3beta03 [April 30, 2013]
-  Expanded manual paragraph about writing private chunks, particularly
-    the need to call png_set_keep_unknown_chunks() when writing them.
-  Avoid dereferencing NULL pointer possibly returned from
-     png_create_write_struct() (Andrew Church).
-
-Version 1.6.3beta05 [May 9, 2013]
-  Calculate our own zlib windowBits when decoding rather than trusting the
-    CMF bytes in the PNG datastream.
-  Added an option to force maximum window size for inflating, which was
-    the behavior of libpng15 and earlier.
-  Added png-fix-itxt and png-fix-too-far-back to the built programs and
-    removed warnings from the source code and timepng that are revealed as
-    a result.
-  Detect wrong libpng versions linked to png-fix-too-far-back, which currently
-    only works with libpng versions that can be made to reliably fail when
-    the deflate data contains an out-of-window reference.  This means only
-    1.6 and later.
-  Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
-    message which it is easier to work round than ignore.
-  Updated contrib/pngminus/pnm2png.c (Paul Stewart):
-    Check for EOF
-    Ignore "#" delimited comments in input file to pnm2png.c.
-    Fixed whitespace handling
-    Added a call to png_set_packing()
-    Initialize dimension values so if sscanf fails at least we have known
-      invalid values.
-  Attempt to detect configuration issues with png-fix-too-far-back, which
-    requires both the correct libpng and the correct zlib to function
-    correctly.
-  Check ZLIB_VERNUM for mismatches, enclose #error in quotes
-  Added information in the documentation about problems with and fixes for
-    the bad CRC and bad iTXt chunk situations.
-
-Version 1.6.3beta06 [May 12, 2013]
-  Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and
-    WRITE_PACK supported (writes error message that it can't read P1 or
-  Improved png-fix-too-far-back usage message, added --suffix option.
-  Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
-    right zlib header files.
-  Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile
-
-Version 1.6.3beta07 [June 8, 2013]
-  Removed a redundant test in png_set_IHDR().
-  Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
-  Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
-  Enclose the prototypes for the simplified write API in
-    #ifdef PNG_STDIO_SUPPORTED/#endif
-  Make ARM NEON support work at compile time (not just configure time).
-    This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when
-    using a compiler that compiles for multiple architectures at one time.
-  Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from
-    pnglibconf.h, allowing more of the decisions to be made internally
-    (pngpriv.h) during the compile.  Without this, symbol prefixing is broken
-    under certain circumstances on ARM platforms.  Now only the API parts of
-    the optimizations ('check' vs 'api') are exposed in the public header files
-    except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the
-    decision about whether or not to use the optimizations.
-  Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage.
-    Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test
-    on __ARM_NEON__ from configure time to compile time.  This breaks symbol
-    prefixing because the definition of the special png_init_filter_functions
-    call was hidden at configure time if the relevant compiler arguments are
-    passed in CFLAGS as opposed to CC.  This change attempts to avoid all
-    the confusion that would result by declaring the init function even when
-    it is not used, so that it will always get prefixed.
-
-Version 1.6.3beta08 [June 18, 2013]
-  Revised libpng.3 so that "doclift" can process it.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CHANGES

@@ -4047,7 +4047,9 @@ Version 1.6.0beta17 [March 10, 2012]
   Deflate/inflate was reworked to move common zlib calls into single
     functions [rw]util.c.  A new shared keyword check routine was also added
     and the 'zbuf' is no longer allocated on progressive read.  It is now
-    possible to call png_inflate() incrementally.
+    possible to call png_inflate() incrementally.  A warning is no longer
+    issued if the language tag or translated keyword in the iTXt chunk
+    has zero length.
   If benign errors are disabled use maximum window on ancilliary inflate.
     This works round a bug introduced in 1.5.4 where compressed ancillary
     chunks could end up with a too-small windowBits value in the deflate
@@ -4587,7 +4589,50 @@ Version 1.6.3beta07 [June 8, 2013]
     it is not used, so that it will always get prefixed.
 
 Version 1.6.3beta08 [June 18, 2013]
-  Revised libpng.3 so that "doclift" can process it.
+  Revised libpng.3 so that "doclifter" can process it.
+
+Version 1.6.3beta09 [June 27, 2013]
+  Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
+    as parameters for png_set_gamma().  These have been available since
+    libpng-1.5.4.
+  Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
+    to check all compressed chunks known to libpng.
+
+Version 1.6.3beta10 [July 5, 2013]
+  Updated documentation to show default behavior of benign errors correctly.
+  Only compile ARM code when PNG_READ_SUPPORTED is defined.
+  Fixed undefined behavior in contrib/tools/pngfix.c and added new strip
+    option. pngfix relied on undefined behavior and even a simple change from
+    gcc to g++ caused it to fail.  The new strip option 'unsafe' has been
+    implemented and is the default if --max is given.  Option names have
+    been clarified, with --strip=transform now stripping the bKGD chunk,
+    which was stripped previously with --strip=unused.
+  Added all documented chunk types to pngpriv.h
+  Unified pngfix.c source with libpng17.
+
+Version 1.6.3rc01 [July 11, 2013]
+  No changes.
+
+Version 1.6.3 [July 18, 2013]
+  Revised manual about changes in iTXt chunk handling made in libpng-1.6.0.
+  Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings
+    may be erroneously issued by code-checking applications.
+
+Version 1.6.4beta01 [August 21, 2013]
+  Added information about png_set_options() to the manual.
+  Delay calling png_init_filter_functions() until a row with nonzero filter
+    is found.
+
+Version 1.6.4beta02 [August 30, 2013]
+  Fixed inconsistent conditional compilation of png_chunk_unknown_handling()
+    prototype, definition, and usage.  Made it depend on
+    PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere.
+
+Version 1.6.4rc01 [September 5, 2013]
+  No changes.
+
+Version 1.6.4 [September 12, 2013]
+  No changes.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CMakeLists.txt

@@ -16,7 +16,7 @@ enable_testing()
 
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 6)
-set(PNGLIB_RELEASE 3)
+set(PNGLIB_RELEASE 4)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 
@@ -252,7 +252,7 @@ endif(NOT WIN32 OR CYGWIN OR MINGW)
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 16.${PNGLIB_RELEASE}.1.6.3beta08
+#   VERSION 16.${PNGLIB_RELEASE}.1.6.4
     VERSION 16.${PNGLIB_RELEASE}.0
     SOVERSION 16
     CLEAN_DIRECT_OUTPUT 1)

LICENSE

@@ -10,8 +10,8 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.3beta08, June 18, 2013, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.4, September 12, 2013, are
-Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are
+Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
 
@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-June 18, 2013
+September 12, 2013

Makefile.am

@@ -10,7 +10,7 @@ ACLOCAL_AMFLAGS = -I scripts
 check_PROGRAMS= pngtest pngunknown pngstest pngvalid
 
 # Utilities - installed
-bin_PROGRAMS= png-fix-too-far-back png-fix-itxt
+bin_PROGRAMS= pngfix png-fix-itxt
 
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
@@ -24,8 +24,8 @@ pngstest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 pngunknown_SOURCES = contrib/libtests/pngunknown.c
 pngunknown_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 
-png_fix_too_far_back_SOURCES = contrib/tools/png-fix-too-far-back.c
+pngfix_SOURCES = contrib/tools/pngfix.c
-png_fix_too_far_back_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
+pngfix_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 
 png_fix_itxt_SOURCES = contrib/tools/png-fix-itxt.c
 
@@ -196,7 +196,7 @@ $(srcdir)/scripts/pnglibconf.h.prebuilt:
 # an installed one (this can happen immediately after on a clean system if
 # 'make test' is the first thing the user does.)
 pngstest.o pngvalid.o pngtest.o pngunknown.o timepng.o: pnglibconf.h
-png-fix-too-far-back.o png-fix-itxt.o: pnglibconf.h
+pngfix.o png-fix-itxt.o: pnglibconf.h
 
 # We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
 # be built with PNG_USE_READ_MACROS; this prevents the read macros from

README

@@ -1,4 +1,4 @@
-README for libpng version 1.6.3beta08 - June 18, 2013 (shared library 16.0)
+README for libpng version 1.6.4 - September 12, 2013 (shared library 16.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.

arm/arm_init.c

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2013 Glenn Randers-Pehrson
  * Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.5.17 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.17 [July 18, 2013]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -16,6 +16,9 @@
 
 #include "../pngpriv.h"
 
+#ifdef PNG_READ_SUPPORTED
+  if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) ==
+     PNG_OPTION_ON)
 #if PNG_ARM_NEON_OPT > 0
 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
 #include <signal.h> /* for sig_atomic_t */
@@ -217,3 +220,4 @@ png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
    }
 }
 #endif /* PNG_ARM_NEON_OPT > 0 */
+#endif /* PNG_READ_SUPPORTED */

arm/filter_neon.S

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2013 Glenn Randers-Pehrson
  * Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.5.17 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.17 [July 18, 2013]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -20,6 +20,7 @@
 .section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
 #endif
 
+#ifdef PNG_READ_SUPPORTED
 #if PNG_ARM_NEON_OPT > 0
 
 #ifdef __ELF__
@@ -233,3 +234,4 @@ func    png_read_filter_row_paeth3_neon, export=1
         pop             {r4,pc}
 endfunc
 #endif /* PNG_ARM_NEON_OPT > 0 */
+#endif /* PNG_READ_SUPPORTED */

configure.ac

@@ -18,7 +18,7 @@ AC_PREREQ([2.68])
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.3beta08],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.6.4],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -39,10 +39,10 @@ dnl automake, so the following is not necessary (and is not defined anyway):
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake
 
-PNGLIB_VERSION=1.6.3beta08
+PNGLIB_VERSION=1.6.4
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
-PNGLIB_RELEASE=3
+PNGLIB_RELEASE=4
 
 dnl End of version number stuff
 

contrib/tools/png-fix-itxt.c

@@ -2,7 +2,7 @@
 /* png-fix-itxt version 1.0.0
  *
  * Copyright 2013 Glenn Randers-Pehrson
- * Last changed in libpng 1.6.3 [(PENDING RELEASE)]
+ * Last changed in libpng 1.6.3 [July 18, 2013]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer

example.c

@@ -2,7 +2,7 @@
 #if 0 /* in case someone actually tries to compile this */
 
 /* example.c - an example of using libpng
- * Last changed in libpng 1.6.0 [February 14, 2013]
+ * Last changed in libpng 1.6.3 [July 18, 2013]
  * Maintained 1998-2013 Glenn Randers-Pehrson
  * Maintained 1996, 1997 Andreas Dilger)
  * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -441,9 +441,9 @@ void read_png(FILE *fp, unsigned int sig_read)  /* File is already open */
    /* If we don't have another value */
    else
    {
-      screen_gamma = 2.2;  /* A good guess for a PC monitor in a dimly
+      screen_gamma = PNG_DEFAULT_sRGB;  /* A good guess for a PC monitor
-                              lit room */
+                                           in a dimly lit room */
-      screen_gamma = 1.7 or 1.0;  /* A good guess for Mac systems */
+      screen_gamma = PNG_GAMMA_MAC_18 or 1.0; /* Good guesses for Mac systems */
    }
 
    /* Tell libpng to handle the gamma conversion for you.  The final call
@@ -455,7 +455,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* File is already open */
    int intent;
 
    if (png_get_sRGB(png_ptr, info_ptr, &intent))
-      png_set_gamma(png_ptr, screen_gamma, 0.45455);
+      png_set_gamma(png_ptr, screen_gamma, PNG_DEFAULT_sRGB);
    else
    {
       double image_gamma;

libpng-manual.txt

@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.3beta08 - June 18, 2013
+ libpng version 1.6.4 - September 12, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.3beta08 - June 18, 2013
+ libpng versions 0.97, January 1998, through 1.6.4 - September 12, 2013
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
@@ -740,7 +740,7 @@ situations:
                      encoding.
 
 You would use the linear (unencoded) value if you need to process the pixel
-values further because this avoids the need to decode and reencode each
+values further because this avoids the need to decode and re-encode each
 component value whenever arithmetic is performed.  A lot of graphics software
 uses linear values for this reason, often with higher precision component values
 to preserve overall accuracy.
@@ -2289,7 +2289,7 @@ For a more compact example of reading a PNG image, see the file example.c.
 
 Reading PNG files progressively
 
-The progressive reader is slightly different then the non-progressive
+The progressive reader is slightly different from the non-progressive
 reader.  Instead of calling png_read_info(), png_read_rows(), and
 png_read_end(), you make one call to png_process_data(), which calls
 callbacks when it has the info, a row, or the end of the image.  You
@@ -3535,7 +3535,7 @@ The simplified API, which became available in libpng-1.6.0, hides the details
 of both libpng and the PNG file format itself.
 It allows PNG files to be read into a very limited number of
 in-memory bitmap formats or to be written from the same formats.  If these
-formats do not accomodate your needs then you can, and should, use the more
+formats do not accommodate your needs then you can, and should, use the more
 sophisticated APIs above - these support a wide variety of in-memory formats
 and a wide variety of sophisticated transformations to those formats as well
 as a wide variety of APIs to manipulate ancilliary information.
@@ -4026,9 +4026,12 @@ as warnings.
 
     png_set_benign_errors (png_ptr, int allowed);
 
-    allowed: 0: (default) treat png_benign_error() an error.
+    allowed: 0: treat png_benign_error() as an error.
              1: treat png_benign_error() as a warning.
 
+As of libpng-1.6.0, the default condition is to treat benign errors as
+warnings while reading and as errors while writing.
+
 Custom chunks
 
 If you need to read or write custom chunks, you may need to get deeper
@@ -4606,7 +4609,7 @@ it has not been well tested and doesn't actually "dither".
 The code was not
 removed, however, and could be enabled by building libpng with
 PNG_READ_DITHER_SUPPORTED defined.  In libpng-1.4.2, this support
-was reenabled, but the function was renamed png_set_quantize() to
+was re-enabled, but the function was renamed png_set_quantize() to
 reflect more accurately what it actually does.  At the same time,
 the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros were also renamed to
 PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS, and PNG_READ_DITHER_SUPPORTED
@@ -4750,7 +4753,7 @@ did not exist.)
 Applications can now choose whether to use these macros or to call the
 corresponding function by defining PNG_USE_READ_MACROS or
 PNG_NO_USE_READ_MACROS before including png.h.  Notice that this is
-only supported from 1.5.0 -defining PNG_NO_USE_READ_MACROS prior to 1.5.0
+only supported from 1.5.0; defining PNG_NO_USE_READ_MACROS prior to 1.5.0
 will lead to a link failure.
 
 Prior to libpng-1.5.4, the zlib compressor used the same set of parameters
@@ -4786,6 +4789,9 @@ limits are now
    png_user_chunk_cache_max  0 (unlimited)   128
    png_user_chunk_malloc_max 0 (unlimited) 8,000,000
 
+The png_set_option() function (and the "options" member of the png struct) was
+added to libpng-1.5.15.
+
 B. Changes to the build and configuration of libpng
 
 Details of internal changes to the library code can be found in the CHANGES
@@ -5016,9 +5022,16 @@ even if the image only contains gray pixels, only RGB profiles may appear
 in images with color type 2, 3, or 6, is now enforced.  The sRGB chunk
 is allowed to appear in images with any color type.
 
+Prior to libpng-1.6.0 a warning would be issued if the iTXt chunk contained
+an empty language field or an empty translated keyword.  Both of these
+are allowed by the PNG specification, so these warnings are no longer issued.
+
 The library now issues an error if the application attempts to set a
 transform after it calls png_read_update_info().
 
+The default condition for benign_errors is now to treat benign errors as
+warnings while reading and as errors while writing.
+
 The library now issues a warning if both background processing and RGB to
 gray are used when gamma correction happens. As with previous versions of
 the library the results are numerically very incorrect in this case.
@@ -5041,8 +5054,12 @@ to set the size of the sliding window for reading instead of using the default
 files in the wild that have incorrect CMF bytes that cause libpng to now issue
 a "too far back" error and reject the file.  Libpng-1.6.3 provides a way to
 revert to the libpng-1.5.x behavior (ignoring the CMF bytes and using a
-32-kbyte sliding window), and provides a tool
+32-kbyte sliding window), by using
-(contrib/tools/png-fix-too-far-back) for optimizing the CMF bytes
+
+    png_set_option(png_ptr, PNG_MAXIMUM_INFLATE_WINDOW,
+        PNG_OPTION_ON);
+
+and provides a tool (contrib/tools/pngfix) for optimizing the CMF bytes
 correctly.
 
 Libpng-1.6.0 and libpng-1.6.1 wrote uncompressed iTXt chunks with the wrong
@@ -5212,13 +5229,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 XVI. Y2K Compliance in libpng
 
-June 18, 2013
+September 12, 2013
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.3beta08 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.4 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has two year fields.  One is a 2-byte unsigned integer

libpng.3

@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "June 18, 2013"
+.TH LIBPNG 3 "September 12, 2013"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.3beta08
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.4
 .SH SYNOPSIS
 \fB
 #include <png.h>\fP
@@ -504,7 +504,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.3beta08 - June 18, 2013
+ libpng version 1.6.4 - September 12, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -515,7 +515,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.3beta08 - June 18, 2013
+ libpng versions 0.97, January 1998, through 1.6.4 - September 12, 2013
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
@@ -672,7 +672,7 @@ All APIs that take (double) arguments also have a matching API that
 takes the corresponding fixed point integer arguments.  The fixed point
 API has the same name as the floating point one with "_fixed" appended.
 The actual range of values permitted in the APIs is frequently less than
-the full range of (png_fixed_point) (-21474 to +21474).  When APIs require
+the full range of (png_fixed_point) (\-21474 to +21474).  When APIs require
 a non-negative argument the type is recorded as png_uint_32 above.  Consult
 the header file and the text below for more information.
 
@@ -713,7 +713,7 @@ The easiest way to make minor changes to the libpng configuration when
 auto-configuration is supported is to add definitions to the command line
 using (typically) CPPFLAGS.  For example:
 
-CPPFLAGS=-DPNG_NO_FLOATING_ARITHMETIC
+CPPFLAGS=\-DPNG_NO_FLOATING_ARITHMETIC
 
 will change the internal libpng math implementation for gamma correction and
 other arithmetic calculations to fixed point, avoiding the need for fast
@@ -721,7 +721,7 @@ floating point support.  The result can be seen in the generated pnglibconf.h -
 make sure it contains the changed feature macro setting.
 
 If you need to make more extensive configuration changes - more than one or two
-feature macro settings - you can either add -DPNG_USER_CONFIG to the build
+feature macro settings - you can either add \-DPNG_USER_CONFIG to the build
 command line and put a list of feature macro settings in pngusr.h or you can set
 DFA_XTRA (a makefile variable) to a file containing the same information in the
 form of 'option' settings.
@@ -780,7 +780,7 @@ pngusr.dfa in these directories.
 
 C. Configuration using PNG_USR_CONFIG
 
-If -DPNG_USR_CONFIG is added to the CFLAGS when pnglibconf.h is built the file
+If \-DPNG_USR_CONFIG is added to the CFLAGS when pnglibconf.h is built the file
 pngusr.h will automatically be included before the options in
 scripts/pnglibconf.dfa are processed.  Your pngusr.h file should contain only
 macro definitions turning features on or off or setting settings.
@@ -1010,7 +1010,7 @@ input stream. You must supply the function
           unknown chunk structure, process it, and return one
           of the following: */
 
-       return (-n); /* chunk had an error */
+       return (\-n); /* chunk had an error */
        return (0); /* did not recognize */
        return (n); /* success */
     }
@@ -1061,7 +1061,7 @@ non-interlaced case the row that was just handled is simply one less than the
 passed in row number, and pass will always be 0.  For the interlaced case the
 same applies unless the row value is 0, in which case the row just handled was
 the last one from one of the preceding passes.  Because interlacing may skip a
-pass you cannot be sure that the preceding pass is just 'pass-1', if you really
+pass you cannot be sure that the preceding pass is just 'pass\-1', if you really
 need to know what the last pass is record (row,pass) from the callback and use
 the last recorded value each time.
 
@@ -1151,7 +1151,7 @@ callback function:
 .SS User limits
 
 The PNG specification allows the width and height of an image to be as
-large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns.
+large as 2^(31\-1 (0x7fffffff), or about 2.147 billion rows and columns.
 Since very few applications really need to process such large images,
 we have imposed an arbitrary 1-million limit on rows and columns.
 Larger images will be rejected immediately with a png_error() call. If
@@ -1244,7 +1244,7 @@ situations:
                      encoding.
 
 You would use the linear (unencoded) value if you need to process the pixel
-values further because this avoids the need to decode and reencode each
+values further because this avoids the need to decode and re-encode each
 component value whenever arithmetic is performed.  A lot of graphics software
 uses linear values for this reason, often with higher precision component values
 to preserve overall accuracy.
@@ -2723,13 +2723,13 @@ point to libpng-allocated storage with the following function:
            or simply PNG_FREE_ALL
 
     seq  - sequence number of item to be freed
-           (-1 for all items)
+           (\-1 for all items)
 
 This function may be safely called when the relevant storage has
 already been freed, or has not yet been allocated, or was allocated
 by the user and not by libpng,  and will in those cases do nothing.
 The "seq" parameter is ignored if only one item of the selected data
-type, such as PLTE, is allowed.  If "seq" is not -1, and multiple items
+type, such as PLTE, is allowed.  If "seq" is not \-1, and multiple items
 are allowed for the data type identified in the mask, such as text or
 sPLT, only the n'th item in the structure is freed, where n is "seq".
 
@@ -2793,7 +2793,7 @@ For a more compact example of reading a PNG image, see the file example.c.
 
 .SS Reading PNG files progressively
 
-The progressive reader is slightly different then the non-progressive
+The progressive reader is slightly different from the non-progressive
 reader.  Instead of calling png_read_info(), png_read_rows(), and
 png_read_end(), you make one call to png_process_data(), which calls
 callbacks when it has the info, a row, or the end of the image.  You
@@ -3130,7 +3130,7 @@ non-interlaced case the row that was just handled is simply one less than the
 passed in row number, and pass will always be 0.  For the interlaced case the
 same applies unless the row value is 0, in which case the row just handled was
 the last one from one of the preceding passes.  Because interlacing may skip a
-pass you cannot be sure that the preceding pass is just 'pass-1', if you really
+pass you cannot be sure that the preceding pass is just 'pass\-1', if you really
 need to know what the last pass is record (row,pass) from the callback and use
 the last recorded value each time.
 
@@ -3970,13 +3970,13 @@ point to libpng-allocated storage with the following function:
             or simply PNG_FREE_ALL
 
     seq   - sequence number of item to be freed
-            (-1 for all items)
+            (\-1 for all items)
 
 This function may be safely called when the relevant storage has
 already been freed, or has not yet been allocated, or was allocated
 by the user  and not by libpng,  and will in those cases do nothing.
 The "seq" parameter is ignored if only one item of the selected data
-type, such as PLTE, is allowed.  If "seq" is not -1, and multiple items
+type, such as PLTE, is allowed.  If "seq" is not \-1, and multiple items
 are allowed for the data type identified in the mask, such as text or
 sPLT, only the n'th item in the structure is freed, where n is "seq".
 
@@ -4039,7 +4039,7 @@ The simplified API, which became available in libpng-1.6.0, hides the details
 of both libpng and the PNG file format itself.
 It allows PNG files to be read into a very limited number of
 in-memory bitmap formats or to be written from the same formats.  If these
-formats do not accomodate your needs then you can, and should, use the more
+formats do not accommodate your needs then you can, and should, use the more
 sophisticated APIs above - these support a wide variety of in-memory formats
 and a wide variety of sophisticated transformations to those formats as well
 as a wide variety of APIs to manipulate ancilliary information.
@@ -4530,9 +4530,12 @@ as warnings.
 
     png_set_benign_errors (png_ptr, int allowed);
 
-    allowed: 0: (default) treat png_benign_error() an error.
+    allowed: 0: treat png_benign_error() as an error.
              1: treat png_benign_error() as a warning.
 
+As of libpng-1.6.0, the default condition is to treat benign errors as
+warnings while reading and as errors while writing.
+
 .SS Custom chunks
 
 If you need to read or write custom chunks, you may need to get deeper
@@ -4826,7 +4829,7 @@ this version of libpng, but if you insert some they will be printed.
 
 Starting with libpng-1.6.0, you can configure libpng (when using the
 "configure" script) to prefix all exported symbols by means of the
-configuration option "--with-libpng-prefix=FOO_", where FOO_ can be any
+configuration option "\-\-with\-libpng\-prefix=FOO_", where FOO_ can be any
 string beginning with a letter and containing only uppercase
 and lowercase letters, digits, and the underscore (i.e., a C language
 identifier).  This creates a set of macros in pnglibconf.h, so this is
@@ -5111,7 +5114,7 @@ it has not been well tested and doesn't actually "dither".
 The code was not
 removed, however, and could be enabled by building libpng with
 PNG_READ_DITHER_SUPPORTED defined.  In libpng-1.4.2, this support
-was reenabled, but the function was renamed png_set_quantize() to
+was re-enabled, but the function was renamed png_set_quantize() to
 reflect more accurately what it actually does.  At the same time,
 the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros were also renamed to
 PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS, and PNG_READ_DITHER_SUPPORTED
@@ -5149,7 +5152,7 @@ reading, and after png_write_png() or png_write_image() while writing.
 
    int max_palette = png_get_palette_max(png_ptr, info_ptr);
 
-This will return the maximum palette index found in the image, or "-1" if
+This will return the maximum palette index found in the image, or "\-1" if
 the palette was not checked, or "0" if no palette was found.  Note that this
 does not account for any palette index used by ancillary chunks such as the
 bKGD chunk; you must check those separately to determine the maximum
@@ -5255,7 +5258,7 @@ did not exist.)
 Applications can now choose whether to use these macros or to call the
 corresponding function by defining PNG_USE_READ_MACROS or
 PNG_NO_USE_READ_MACROS before including png.h.  Notice that this is
-only supported from 1.5.0 -defining PNG_NO_USE_READ_MACROS prior to 1.5.0
+only supported from 1.5.0; defining PNG_NO_USE_READ_MACROS prior to 1.5.0
 will lead to a link failure.
 
 Prior to libpng-1.5.4, the zlib compressor used the same set of parameters
@@ -5291,6 +5294,9 @@ limits are now
    png_user_chunk_cache_max  0 (unlimited)   128
    png_user_chunk_malloc_max 0 (unlimited) 8,000,000
 
+The png_set_option() function (and the "options" member of the png struct) was
+added to libpng-1.5.15.
+
 B. Changes to the build and configuration of libpng
 
 Details of internal changes to the library code can be found in the CHANGES
@@ -5521,9 +5527,16 @@ even if the image only contains gray pixels, only RGB profiles may appear
 in images with color type 2, 3, or 6, is now enforced.  The sRGB chunk
 is allowed to appear in images with any color type.
 
+Prior to libpng-1.6.0 a warning would be issued if the iTXt chunk contained
+an empty language field or an empty translated keyword.  Both of these
+are allowed by the PNG specification, so these warnings are no longer issued.
+
 The library now issues an error if the application attempts to set a
 transform after it calls png_read_update_info().
 
+The default condition for benign_errors is now to treat benign errors as
+warnings while reading and as errors while writing.
+
 The library now issues a warning if both background processing and RGB to
 gray are used when gamma correction happens. As with previous versions of
 the library the results are numerically very incorrect in this case.
@@ -5546,8 +5559,12 @@ to set the size of the sliding window for reading instead of using the default
 files in the wild that have incorrect CMF bytes that cause libpng to now issue
 a "too far back" error and reject the file.  Libpng-1.6.3 provides a way to
 revert to the libpng-1.5.x behavior (ignoring the CMF bytes and using a
-32-kbyte sliding window), and provides a tool
+32-kbyte sliding window), by using
-(contrib/tools/png-fix-too-far-back) for optimizing the CMF bytes
+
+    png_set_option(png_ptr, PNG_MAXIMUM_INFLATE_WINDOW,
+        PNG_OPTION_ON);
+
+and provides a tool (contrib/tools/pngfix) for optimizing the CMF bytes
 correctly.
 
 Libpng-1.6.0 and libpng-1.6.1 wrote uncompressed iTXt chunks with the wrong
@@ -5696,7 +5713,7 @@ C binary operator and after "for" or "while", and before
 being cast, nor do we put one between a function name and the
 left parenthesis that follows it:
 
-    for (i = 2; i > 0; --i)
+    for (i = 2; i > 0; \-\-i)
        y[i] = a(x) + (int)b;
 
 We prefer #ifdef and #ifndef to #if defined() and #if !defined()
@@ -5717,13 +5734,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XVI. Y2K Compliance in libpng
 
-June 18, 2013
+September 12, 2013
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.3beta08 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.4 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -5937,7 +5954,12 @@ the first widely used release:
  1.6.2beta01         16    10602  16.so.16.2[.0]
  1.6.2rc01-06        16    10602  16.so.16.2[.0]
  1.6.2               16    10602  16.so.16.2[.0]
- 1.6.3beta01-08      16    10603  16.so.16.3[.0]
+ 1.6.3beta01-11      16    10603  16.so.16.3[.0]
+ 1.6.3rc01           16    10603  16.so.16.3[.0]
+ 1.6.3               16    10603  16.so.16.3[.0]
+ 1.6.4beta01-02      16    10604  16.so.16.4[.0]
+ 1.6.4rc01           16    10604  16.so.16.4[.0]
+ 1.6.4               16    10604  16.so.16.4[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -5994,7 +6016,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.6.3beta08 - June 18, 2013:
+Libpng version 1.6.4 - September 12, 2013:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6017,7 +6039,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.3beta08, June 18, 2013, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.4, September 12, 2013, are
 Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -6116,7 +6138,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-June 18, 2013
+September 12, 2013
 
 .\" end of man page
 

libpngpf.3

@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "June 18, 2013"
+.TH LIBPNGPF 3 "September 12, 2013"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.3beta08
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.4
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "June 18, 2013"
+.TH PNG 5 "September 12, 2013"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION

png.c

@@ -14,7 +14,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_3beta08 Your_png_h_is_not_version_1_6_3beta08;
+typedef png_libpng_version_1_6_4 Your_png_h_is_not_version_1_6_4;
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
  * of the PNG file signature.  If the PNG data is embedded into another
@@ -768,13 +768,13 @@ png_get_copyright(png_const_structrp png_ptr)
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.6.3beta08 - June 18, 2013" PNG_STRING_NEWLINE \
+     "libpng version 1.6.4 - September 12, 2013" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2013 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.6.3beta08 - June 18, 2013\
+      return "libpng version 1.6.4 - September 12, 2013\
       Copyright (c) 1998-2013 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@@ -855,7 +855,7 @@ png_handle_as_unknown(png_const_structrp png_ptr, png_const_bytep chunk_name)
    return PNG_HANDLE_CHUNK_AS_DEFAULT;
 }
 
-#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 int /* PRIVATE */
 png_chunk_unknown_handling(png_const_structrp png_ptr, png_uint_32 chunk_name)
 {
@@ -864,7 +864,7 @@ png_chunk_unknown_handling(png_const_structrp png_ptr, png_uint_32 chunk_name)
    PNG_CSTRING_FROM_CHUNK(chunk_string, chunk_name);
    return png_handle_as_unknown(png_ptr, chunk_string);
 }
-#endif /* READ_UNKNOWN_CHUNKS */
+#endif /* HANDLE_AS_UNKNOWN */
 #endif /* SET_UNKNOWN_CHUNKS */
 
 #ifdef PNG_READ_SUPPORTED

png.h

@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.3beta08 - June 18, 2013
+ * libpng version 1.6.4 - September 12, 2013
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -11,7 +11,7 @@
  * Authors and maintainers:
  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.6.3beta08 - June 18, 2013: Glenn
+ *   libpng versions 0.97, January 1998, through 1.6.4 - September 12, 2013: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -175,7 +175,12 @@
  *    1.6.2beta01             16    10602  16.so.16.2[.0]
  *    1.6.2rc01-06            16    10602  16.so.16.2[.0]
  *    1.6.2                   16    10602  16.so.16.2[.0]
- *    1.6.3beta01-08          16    10603  16.so.16.3[.0]
+ *    1.6.3beta01-11          16    10603  16.so.16.3[.0]
+ *    1.6.3rc01               16    10603  16.so.16.3[.0]
+ *    1.6.3                   16    10603  16.so.16.3[.0]
+ *    1.6.4beta01-02          16    10604  16.so.16.4[.0]
+ *    1.6.4rc01               16    10604  16.so.16.4[.0]
+ *    1.6.4                   16    10604  16.so.16.4[.0]
  *
  *   Henceforth the source version will match the shared-library major
  *   and minor numbers; the shared-library major version number will be
@@ -207,7 +212,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.6.3beta08, June 18, 2013, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.6.4, September 12, 2013, are
  * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -319,13 +324,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    June 18, 2013
+ *    September 12, 2013
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.6.3beta08 are Y2K compliant.  It is my belief that
+ *    upward through 1.6.4 are Y2K compliant.  It is my belief that
  *    earlier versions were also Y2K compliant.
  *
  *    Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -385,9 +390,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.3beta08"
+#define PNG_LIBPNG_VER_STRING "1.6.4"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.6.3beta08 - June 18, 2013\n"
+     " libpng version 1.6.4 - September 12, 2013\n"
 
 #define PNG_LIBPNG_VER_SONUM   16
 #define PNG_LIBPNG_VER_DLLNUM  16
@@ -395,13 +400,13 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   6
-#define PNG_LIBPNG_VER_RELEASE 3
+#define PNG_LIBPNG_VER_RELEASE 4
 
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  08
+#define PNG_LIBPNG_VER_BUILD  0
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -418,7 +423,7 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
@@ -426,7 +431,7 @@
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
  */
-#define PNG_LIBPNG_VER 10603 /* 1.6.3 */
+#define PNG_LIBPNG_VER 10604 /* 1.6.4 */
 
 /* Library configuration: these options cannot be changed after
  * the library has been built.
@@ -531,7 +536,7 @@ extern "C" {
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char* png_libpng_version_1_6_3beta08;
+typedef char* png_libpng_version_1_6_4;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *

pngconf.h

@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.6.3beta08 - June 18, 2013
+ * libpng version 1.6.4 - September 12, 2013
  *
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

pngpread.c

@@ -151,7 +151,7 @@ png_process_some_data(png_structrp png_ptr, png_inforp info_ptr)
 void /* PRIVATE */
 png_push_read_sig(png_structrp png_ptr, png_inforp info_ptr)
 {
-   png_size_t num_checked = png_ptr->sig_bytes,
+   png_size_t num_checked = png_ptr->sig_bytes, /* SAFE, does not exceed 8 */ 
              num_to_check = 8 - num_checked;
 
    if (png_ptr->buffer_size < num_to_check)

pngpriv.h

@@ -6,7 +6,7 @@
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
- * Last changed in libpng 1.6.3 [(PENDING RELEASE)]
+ * Last changed in libpng 1.6.3 [July 18, 2013]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -670,37 +670,64 @@
  * architectures where (int) is only 16 bits.
  */
 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
-#define PNG_CHUNK(b1,b2,b3,b4) \
+#define PNG_U32(b1,b2,b3,b4) \
    (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
 
-#define png_IHDR PNG_CHUNK( 73,  72,  68,  82)
+/* Constants for known chunk types.
-#define png_IDAT PNG_CHUNK( 73,  68,  65,  84)
+ *
-#define png_IEND PNG_CHUNK( 73,  69,  78,  68)
+ * MAINTAINERS: If you need to add a chunk, define the name here.
-#define png_PLTE PNG_CHUNK( 80,  76,  84,  69)
+ * For historical reasons these constants have the form png_<name>; i.e.
-#define png_bKGD PNG_CHUNK( 98,  75,  71,  68)
+ * the prefix is lower case.  Please use decimal values as the parameters to
-#define png_cHRM PNG_CHUNK( 99,  72,  82,  77)
+ * match the ISO PNG specification and to avoid relying on the C locale
-#define png_gAMA PNG_CHUNK(103,  65,  77,  65)
+ * interpretation of character values.  Please keep the list sorted.
-#define png_hIST PNG_CHUNK(104,  73,  83,  84)
+ *
-#define png_iCCP PNG_CHUNK(105,  67,  67,  80)
+ * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
-#define png_iTXt PNG_CHUNK(105,  84,  88, 116)
+ * type.  In fact the specification does not express chunk types this way,
-#define png_oFFs PNG_CHUNK(111,  70,  70, 115)
+ * however using a 32-bit value means that the chunk type can be read from the
-#define png_pCAL PNG_CHUNK(112,  67,  65,  76)
+ * stream using exactly the same code as used for a 32-bit unsigned value and
-#define png_sCAL PNG_CHUNK(115,  67,  65,  76)
+ * can be examined far more efficiently (using one arithmetic compare).
-#define png_pHYs PNG_CHUNK(112,  72,  89, 115)
+ *
-#define png_sBIT PNG_CHUNK(115,  66,  73,  84)
+ * Prior to 1.5.6 the chunk type constants were expressed as C strings.  The
-#define png_sPLT PNG_CHUNK(115,  80,  76,  84)
+ * libpng API still uses strings for 'unknown' chunks and a macro,
-#define png_sRGB PNG_CHUNK(115,  82,  71,  66)
+ * PNG_STRING_FROM_CHUNK, allows a string to be generated if required.  Notice
-#define png_sTER PNG_CHUNK(115,  84,  69,  82)
+ * that for portable code numeric values must still be used; the string "IHDR"
-#define png_tEXt PNG_CHUNK(116,  69,  88, 116)
+ * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
-#define png_tIME PNG_CHUNK(116,  73,  77,  69)
+ *
-#define png_tRNS PNG_CHUNK(116,  82,  78,  83)
+ * In 1.7.0 the definitions will be made public in png.h to avoid having to
-#define png_zTXt PNG_CHUNK(122,  84,  88, 116)
+ * duplicate the same definitions in application code.
+ */
+#define png_IDAT PNG_U32( 73,  68,  65,  84)
+#define png_IEND PNG_U32( 73,  69,  78,  68)
+#define png_IHDR PNG_U32( 73,  72,  68,  82)
+#define png_PLTE PNG_U32( 80,  76,  84,  69)
+#define png_bKGD PNG_U32( 98,  75,  71,  68)
+#define png_cHRM PNG_U32( 99,  72,  82,  77)
+#define png_fRAc PNG_U32(102,  82,  65,  99) /* registered, not defined */
+#define png_gAMA PNG_U32(103,  65,  77,  65)
+#define png_gIFg PNG_U32(103,  73,  70, 103)
+#define png_gIFt PNG_U32(103,  73,  70, 116) /* deprecated */
+#define png_gIFx PNG_U32(103,  73,  70, 120)
+#define png_hIST PNG_U32(104,  73,  83,  84)
+#define png_iCCP PNG_U32(105,  67,  67,  80)
+#define png_iTXt PNG_U32(105,  84,  88, 116)
+#define png_oFFs PNG_U32(111,  70,  70, 115)
+#define png_pCAL PNG_U32(112,  67,  65,  76)
+#define png_pHYs PNG_U32(112,  72,  89, 115)
+#define png_sBIT PNG_U32(115,  66,  73,  84)
+#define png_sCAL PNG_U32(115,  67,  65,  76)
+#define png_sPLT PNG_U32(115,  80,  76,  84)
+#define png_sRGB PNG_U32(115,  82,  71,  66)
+#define png_sTER PNG_U32(115,  84,  69,  82)
+#define png_tEXt PNG_U32(116,  69,  88, 116)
+#define png_tIME PNG_U32(116,  73,  77,  69)
+#define png_tRNS PNG_U32(116,  82,  78,  83)
+#define png_zTXt PNG_U32(122,  84,  88, 116)
 
 /* The following will work on (signed char*) strings, whereas the get_uint_32
  * macro will fail on top-bit-set values because of the sign extension.
  */
 #define PNG_CHUNK_FROM_STRING(s)\
-   PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
+   PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
 
 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
  * signed and the argument is a (char[])  This macro will fail miserably on
@@ -1404,15 +1431,13 @@ PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
     * just skips the chunk or errors out if it is critical.
     */
 
-#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
     (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
    /* Exactly as the API png_handle_as_unknown() except that the argument is a
     * 32-bit chunk name, not a string.
     */
-#endif
+#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */
-#endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */
 #endif /* PNG_READ_SUPPORTED */
 
 /* Handle the transformations for reading and writing */

pngread.c

@@ -3285,7 +3285,7 @@ png_image_read_background(png_voidp argument)
 
       case 8:
          /* 8-bit sRGB gray values with an alpha channel; the alpha channel is
-          * to be removed by composing on a backgroundi: either the row if
+          * to be removed by composing on a background: either the row if
           * display->background is NULL or display->background->green if not.
           * Unlike the code above ALPHA_OPTIMIZED has *not* been done.
           */

pngrtran.c

@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.6.2 [April 25, 2013]
+ * Last changed in libpng 1.6.4 [September 12, 2013]
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -1116,12 +1116,18 @@ png_init_palette_transformations(png_structrp png_ptr)
 
       /* Ignore if all the entries are opaque (unlikely!) */
       for (i=0; i<png_ptr->num_trans; ++i)
+      {
          if (png_ptr->trans_alpha[i] == 255)
             continue;
          else if (png_ptr->trans_alpha[i] == 0)
             input_has_transparency = 1;
          else
+         {
+            input_has_transparency = 1;
             input_has_alpha = 1;
+            break;
+         }
+      }
    }
 
    /* If no alpha we can optimize. */
@@ -1878,31 +1884,34 @@ png_init_read_transformations(png_structrp png_ptr)
        * the number of significant bits is 0 then no shift is done (this is an
        * error condition which is silently ignored.)
        */
-      if (shift > 0 && shift < 8) for (i=0; i<istop; ++i)
+      if (shift > 0 && shift < 8)
-      {
+         for (i=0; i<istop; ++i)
-         int component = png_ptr->palette[i].red;
+         {
+            int component = png_ptr->palette[i].red;
 
-         component >>= shift;
+            component >>= shift;
-         png_ptr->palette[i].red = (png_byte)component;
+            png_ptr->palette[i].red = (png_byte)component;
-      }
+         }
 
       shift = 8 - png_ptr->sig_bit.green;
-      if (shift > 0 && shift < 8) for (i=0; i<istop; ++i)
+      if (shift > 0 && shift < 8)
-      {
+         for (i=0; i<istop; ++i)
-         int component = png_ptr->palette[i].green;
+         {
+            int component = png_ptr->palette[i].green;
 
-         component >>= shift;
+            component >>= shift;
-         png_ptr->palette[i].green = (png_byte)component;
+            png_ptr->palette[i].green = (png_byte)component;
-      }
+         }
 
       shift = 8 - png_ptr->sig_bit.blue;
-      if (shift > 0 && shift < 8) for (i=0; i<istop; ++i)
+      if (shift > 0 && shift < 8)
-      {
+         for (i=0; i<istop; ++i)
-         int component = png_ptr->palette[i].blue;
+         {
+            int component = png_ptr->palette[i].blue;
 
-         component >>= shift;
+            component >>= shift;
-         png_ptr->palette[i].blue = (png_byte)component;
+            png_ptr->palette[i].blue = (png_byte)component;
-      }
+         }
    }
 #endif  /* PNG_READ_SHIFT_SUPPORTED */
 }

pngrutil.c

@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.6.3 [(PENDING RELEASE)]
+ * Last changed in libpng 1.6.4 [September 12, 2013]
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -2764,7 +2764,6 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
 
    png_debug(1, "in png_handle_unknown");
 
-#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
    /* NOTE: this code is based on the code in libpng-1.4.12 except for fixing
     * the bug which meant that setting a non-default behavior for a specific
     * chunk would be ignored (the default was always used unless a user
@@ -2776,16 +2775,15 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
     * This is just an optimization to avoid multiple calls to the lookup
     * function.
     */
-#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#     ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
+   keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name);
-         keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name);
-#     endif
 #  endif
 
    /* One of the following methods will read the chunk or skip it (at least one
     * of these is always defined because this is the only way to switch on
     * PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
     */
+#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
 #  ifdef PNG_READ_USER_CHUNKS_SUPPORTED
       /* The user callback takes precedence over the chunk keep value, but the
        * keep value is still required to validate a save of a critical chunk.
@@ -2893,7 +2891,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
 
          png_crc_finish(png_ptr, length);
       }
-#  endif
+#  endif /* PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED */
 
 #  ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
       /* Now store the chunk in the chunk list if appropriate, and if the limits
@@ -3694,7 +3692,7 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
 
             for (i = 0; i < row_info->width; i++)
             {
-               png_byte v[8];
+               png_byte v[8]; /* SAFE; pixel_depth does not exceed 64 */
                int j;
 
                memcpy(v, sp, pixel_bytes);
@@ -3880,7 +3878,8 @@ png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
 
 static void
 png_init_filter_functions(png_structrp pp)
-   /* This function is called once for every PNG image to set the
+   /* This function is called once for every PNG image (except for PNG images
+    * that only use PNG_FILTER_VALUE_NONE for all rows) to set the
     * implementations required to reverse the filtering of PNG rows.  Reversing
     * the filter is the first transformation performed on the row data.  It is
     * performed in place, therefore an implementation can be selected based on
@@ -3922,10 +3921,13 @@ png_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row,
     * PNG_FILTER_OPTIMIZATIONS to a function that overrides the generic
     * implementations.  See png_init_filter_functions above.
     */
-   if (pp->read_filter[0] == NULL)
-      png_init_filter_functions(pp);
    if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST)
+   {
+      if (pp->read_filter[0] == NULL)
+         png_init_filter_functions(pp);
+
       pp->read_filter[filter-1](row_info, row, prev_row);
+   }
 }
 
 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
@@ -4469,5 +4471,4 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
 
    png_ptr->flags |= PNG_FLAG_ROW_INIT;
 }
-
 #endif /* PNG_READ_SUPPORTED */

pngset.c

@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.6.3 [(PENDING RELEASE)]
+ * Last changed in libpng 1.6.3 [July 18, 2013]
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

pngtest.c

@@ -1968,4 +1968,4 @@ main(void)
 #endif
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_3beta08 Your_png_h_is_not_version_1_6_3beta08;
+typedef png_libpng_version_1_6_4 Your_png_h_is_not_version_1_6_4;

projects/vstudio/readme.txt

@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.6.3beta08 - June 18, 2013
+libpng version 1.6.4 - September 12, 2013
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 

projects/vstudio/zlib.props

@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.6.3beta08 - June 18, 2013
+ * libpng version 1.6.4 - September 12, 2013
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *

scripts/README.txt

@@ -1,9 +1,9 @@
 
-Makefiles for  libpng version 1.6.3beta08 - June 18, 2013
+Makefiles for  libpng version 1.6.4 - September 12, 2013
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng16.so.16.1.6.3beta08)
+                       (gcc, creates libpng16.so.16.1.6.4)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -20,7 +20,7 @@ pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       (gcc, creates libpng16.so.16.1.6.3beta08)
+                       (gcc, creates libpng16.so.16.1.6.4)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.hpgcc    =>  HPUX makefile using gcc
@@ -35,12 +35,12 @@ pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires libpng.def)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng16.so.16.1.6.3beta08)
+                       creates libpng16.so.16.1.6.4)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng16.so.16.1.6.3beta08)
+                       creates libpng16.so.16.1.6.4)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng16.so.16.1.6.3beta08)
+                       creates libpng16.so.16.1.6.4)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile

scripts/def.dfn

@@ -21,7 +21,7 @@ PNG_DFN "OS2 DESCRIPTION "PNG image compression library""
 PNG_DFN "OS2 CODE PRELOAD MOVEABLE DISCARDABLE"
 PNG_DFN ""
 PNG_DFN "EXPORTS"
-PNG_DFN ";Version 1.6.3beta08"
+PNG_DFN ";Version 1.6.4"
 
 #define PNG_EXPORTA(ordinal, type, name, args, attributes)\
         PNG_DFN "@" SYMBOL_PREFIX "@@" name "@"

scripts/libpng-config-head.in

@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.6.3beta08
+version=1.6.4
 prefix=""
 libdir=""
 libs=""

scripts/libpng.pc.in

@@ -5,6 +5,6 @@ includedir=@includedir@/libpng16
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.6.3beta08
+Version: 1.6.4
 Libs: -L${libdir} -lpng16
 Cflags: -I${includedir}

scripts/makefile.cegcc

@@ -23,7 +23,7 @@
 
 VERMAJ = 1
 VERMIN = 6
-VERMIC = 3
+VERMIC = 4
 VER = $(VERMAJ).$(VERMIN).$(VERMIC)
 NAME = libpng
 PACKAGE = $(NAME)-$(VER)

scripts/makefile.linux

@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng16
 PNGMAJ = 16
-RELEASE = 3
+RELEASE = 4
 
 # Shared library names:
 LIBSO=$(LIBNAME).so

scripts/makefile.msys

@@ -18,7 +18,7 @@ exec_prefix=$(prefix)
 # Library name:
 LIBNAME = libpng16
 PNGMAJ = 16
-RELEASE = 3
+RELEASE = 4
 
 # Shared library names:
 LIBSO=$(LIBNAME).dll

scripts/makefile.ne12bsd

@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng16
 
 LIB=	png16
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.6.3beta08
+SHLIB_MINOR=	1.6.4
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c

scripts/makefile.netbsd

@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include
 
 LIB=	png
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.3beta08
+SHLIB_MINOR=	1.6.4
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c

scripts/makefile.openbsd

@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.3beta08
+SHLIB_MINOR=	1.6.4
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \

scripts/pnglibconf.h.prebuilt

@@ -1,8 +1,8 @@
-/* libpng 1.6.3beta08 STANDARD API DEFINITION */
+/* libpng 1.6.4 STANDARD API DEFINITION */
 
 /* pnglibconf.h - library build configuration */
 
-/* Libpng version 1.6.3beta08 - June 18, 2013 */
+/* Libpng version 1.6.4 - September 12, 2013 */
 
 /* Copyright (c) 1998-2013 Glenn Randers-Pehrson */
 

scripts/symbols.def

@@ -1,4 +1,4 @@
-;Version 1.6.3beta08
+;Version 1.6.4
 ;--------------------------------------------------------------
 ; LIBPNG symbol list as a Win32 DEF file
 ; Contains all the symbols that can be exported from libpng