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Remove the Y2K compliance statement

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As of July 2018, this statement is no longer necessary.
This commit is contained in:
Cosmin Truta 2018-07-28 23:39:55 -04:00
parent c36c09f004
commit b729fff4a3
22 changed files with 20 additions and 78 deletions
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1
README
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@ -147,7 +147,6 @@ Files in this distribution:
LICENSE => License to use and redistribute libpng
README => This file
TODO => Things not implemented in the current library
Y2KINFO => Statement of Y2K compliance
example.c => Example code for using libpng functions
libpng.3 => manual page for libpng (includes libpng-manual.txt)
libpng-manual.txt => Description of libpng and its functions

57
png.h
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@ -243,63 +243,6 @@
* <https://www.w3.org/TR/2003/REC-PNG-20031110/
*/
/*
* Y2K compliance in libpng:
* =========================
*
* July 15, 2018
*
* 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 1.6.35 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
* that will hold years up to 65535. The other, which is deprecated,
* holds the date in text format, and will hold years up to 9999.
*
* The integer is
* "png_uint_16 year" in png_time_struct.
*
* The string is
* "char time_buffer[29]" in png_struct. This is no longer used
* in libpng-1.6.x and will be removed from libpng-1.7.0.
*
* There are seven time-related functions:
* png.c: png_convert_to_rfc_1123_buffer() in png.c
* (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and
* png_convert_to_rfc_1152() in error prior to libpng-0.98)
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
* png_convert_from_time_t() in pngwrite.c
* png_get_tIME() in pngget.c
* png_handle_tIME() in pngrutil.c, called in pngread.c
* png_set_tIME() in pngset.c
* png_write_tIME() in pngwutil.c, called in pngwrite.c
*
* All handle dates properly in a Y2K environment. The
* png_convert_from_time_t() function calls gmtime() to convert from system
* clock time, which returns (year - 1900), which we properly convert to
* the full 4-digit year. There is a possibility that libpng applications
* are not passing 4-digit years into the png_convert_to_rfc_1123_buffer()
* function, or that they are incorrectly passing only a 2-digit year
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
* but this is not under our control. The libpng documentation has always
* stated that it works with 4-digit years, and the APIs have been
* documented as such.
*
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
* integer to hold the year, and can hold years as large as 65535.
*
* zlib, upon which libpng depends, is also Y2K compliant. It contains
* no date-related code.
*
* Glenn Randers-Pehrson
* libpng maintainer
* PNG Development Group
*/
#ifndef PNG_H
#define PNG_H

2
scripts/makefile.32sunu
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@ -219,7 +219,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.64sunu
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@ -219,7 +219,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.darwin
View File

@ -200,7 +200,7 @@ clean:
$(RM_F) *.o libpng.a pngtest pngout.png libpng-config \
libpng.pc $(LIBNAME).*dylib pngtesti pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.freebsd
View File

@ -62,7 +62,7 @@ test: pngtest
pnglibconf.h: $(PNGLIBCONF_H_PREBUILT)
cp $(PNGLIBCONF_H_PREBUILT) $@
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.hp64
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@ -206,7 +206,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.hpgcc
View File

@ -209,7 +209,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.hpux
View File

@ -204,7 +204,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.knr
View File

@ -91,7 +91,7 @@ install: libpng.a png.h pngconf.h pnglibconf.h
clean:
$(RM_F) *.o libpng.a pngtest pngout.png ansi2knr pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.linux
View File

@ -222,7 +222,7 @@ clean:
$(LIBSO) $(LIBSOMAJ)* pngtest-static pngtesti \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.linux-opt
View File

@ -232,7 +232,7 @@ clean:
$(LIBSO) $(LIBSOMAJ)* pngtest-static pngtesti \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.mips
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@ -78,7 +78,7 @@ install: libpng.a
clean:
rm -f *.o libpng.a pngtest pngout.png pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.openbsd
View File

@ -28,7 +28,7 @@ NOPROFILE= Yes
CLEANFILES+= pngtest.o pngtest pnglibconf.h
MAN= libpng.3 libpngpf.3 png.5
DOCS= ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO \
DOCS= ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO \
libpng-manual.txt
# Pre-built configuration

2
scripts/makefile.sco
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@ -201,7 +201,7 @@ clean:
$(LIBSO) $(LIBSOMAJ)* pngtest-static pngtesti \
pnglibconf.h libpng.pc
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.sggcc
View File

@ -211,7 +211,7 @@ clean:
$(RM_F) libpng.a pngtest pngtesti pngout.png libpng.pc \
so_locations libpng-config $(LIBSO) $(LIBSOMAJ)* pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.sgi
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@ -212,7 +212,7 @@ clean:
$(LIBSO) $(LIBSOMAJ)* \
so_locations pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.so9
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@ -222,7 +222,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.solaris
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@ -219,7 +219,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.solaris-x86
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@ -218,7 +218,7 @@ clean:
libpng-config $(LIBSO) $(LIBSOMAJ)* \
libpng.pc pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.std
View File

@ -109,7 +109,7 @@ clean:
$(RM_F) *.o libpng.a pngtest pngout.png pnglibconf.h pnglibconf.c \
pnglibconf.out
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*

2
scripts/makefile.sunos
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@ -90,7 +90,7 @@ install: libpng.a
clean:
$(RM_F) *.o libpng.a pngtest pngout.png pnglibconf.h
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*