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-rw-r--r--ChangeLog10
-rw-r--r--FAQ108
-rw-r--r--Makefile7
-rw-r--r--Makefile.in7
-rw-r--r--README67
-rw-r--r--adler32.c2
-rw-r--r--compress.c2
-rw-r--r--crc32.c2
-rw-r--r--deflate.c6
-rw-r--r--deflate.h2
-rw-r--r--example.c2
-rw-r--r--gzio.c2
-rw-r--r--infblock.c11
-rw-r--r--infblock.h2
-rw-r--r--infcodes.c12
-rw-r--r--infcodes.h2
-rw-r--r--inffast.c47
-rw-r--r--inffast.h2
-rw-r--r--inflate.c2
-rw-r--r--inftrees.c9
-rw-r--r--inftrees.h2
-rw-r--r--infutil.c2
-rw-r--r--infutil.h2
-rw-r--r--maketree.c2
-rw-r--r--minigzip.c2
-rw-r--r--trees.c2
-rw-r--r--uncompr.c2
-rw-r--r--zconf.h2
-rw-r--r--zlib.36
-rw-r--r--zlib.h6
-rw-r--r--zlib.html971
-rw-r--r--zutil.c2
-rw-r--r--zutil.h2
33 files changed, 1164 insertions, 143 deletions
diff --git a/ChangeLog b/ChangeLog
index 57386a2..bf2e3f9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,16 @@
1 1
2 ChangeLog file for zlib 2 ChangeLog file for zlib
3 3
4Changes in 1.1.4 (11 March 2002)
5- ZFREE was repeated on same allocation on some error conditions.
6 This creates a security problem described in
7 http://www.zlib.org/advisory-2002-03-11.txt
8- Returned incorrect error (Z_MEM_ERROR) on some invalid data
9- Avoid accesses before window for invalid distances with inflate window
10 less than 32K.
11- force windowBits > 8 to avoid a bug in the encoder for a window size
12 of 256 bytes. (A complete fix will be available in 1.1.5).
13
4Changes in 1.1.3 (9 July 1998) 14Changes in 1.1.3 (9 July 1998)
5- fix "an inflate input buffer bug that shows up on rare but persistent 15- fix "an inflate input buffer bug that shows up on rare but persistent
6 occasions" (Mark) 16 occasions" (Mark)
diff --git a/FAQ b/FAQ
index 0feb6d3..47a7d60 100644
--- a/FAQ
+++ b/FAQ
@@ -3,70 +3,98 @@
3 3
4 4
5If your question is not there, please check the zlib home page 5If your question is not there, please check the zlib home page
6http://www.cdrom.com/pub/infozip/zlib/ which may have more recent information. 6http://www.zlib.org which may have more recent information.
7The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
7 8
8 9
91) I need a Windows DLL 10 1. Is zlib Y2K-compliant?
102) I need a Visual Basic interface to zlib
113) compress() returns Z_BUF_ERROR
124) deflate or inflate returns Z_BUF_ERROR
135) Where is the zlib documentation (man pages, etc...)?
146) Why don't you use GNU autoconf, libtool, etc...?
157) There is a bug in zlib.
168) I get "undefined reference to gzputc"
17 11
12 Yes. zlib doesn't handle dates.
18 13
14 2. Where can I get a Windows DLL version?
19 15
201) I need a Windows DLL 16 The zlib sources can be compiled without change to produce a DLL. If you
17 want a precompiled DLL, see http://www.winimage.com/zLibDll/ . Questions
18 about the zlib DLL should be sent to Gilles Vollant (info@winimage.com).
21 19
22 The zlib sources can be compiled without change to produce a DLL. 20 3. Where can I get a Visual Basic interface to zlib?
23 If you want a precompiled DLL, see http://www.winimage.com/zLibDll
24 21
22 See
23 * http://www.winimage.com/zLibDll/cmp-z-it.zip
24 * http://www.dogma.net/markn/articles/zlibtool/zlibtool.htm
25 * contrib/visual-basic.txt in the zlib distribution
25 26
262) I need a Visual Basic interface to zlib 27 4. compress() returns Z_BUF_ERROR
27 28
28 See http://www.tcfb.com/dowseware/cmp-z-it.zip 29 Make sure that before the call of compress, the length of the compressed
29 http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm 30 buffer is equal to the total size of the compressed buffer and not
30 and contrib/visual-basic.txt 31 zero. For Visual Basic, check that this parameter is passed by reference
32 ("as any"), not by value ("as long").
31 33
323) compress() returns Z_BUF_ERROR 34 5. deflate() or inflate() returns Z_BUF_ERROR
33 35
34 Make sure that before the call of compress, the length of the 36 Before making the call, make sure that avail_in and avail_out are not
35 compressed buffer is equal to the total size of the compressed buffer 37 zero. When setting the parameter flush equal to Z_FINISH, also make sure
36 and not zero. For Visual Basic, check that this parameter is passed 38 that avail_out is big enough to allow processing all pending input.
37 by reference ("as any"), not by value ("as long").
38 39
40 6. Where's the zlib documentation (man pages, etc.)?
39 41
404) deflate or inflate returns Z_BUF_ERROR 42 It's in zlib.h for the moment, and Francis S. Lin has converted it to a
43 web page zlib.html. Volunteers to transform this to Unix-style man pages,
44 please contact Jean-loup Gailly (jloup@gzip.org). Examples of zlib usage
45 are in the files example.c and minigzip.c.
41 46
42 Make sure that before the call avail_in and avail_out are not zero. 47 7. Why don't you use GNU autoconf or libtool or ...?
43 48
49 Because we would like to keep zlib as a very small and simple
50 package. zlib is rather portable and doesn't need much configuration.
44 51
455) Where is the zlib documentation (man pages, etc...)? 52 8. I found a bug in zlib.
46 53
47 It's in zlib.h for the moment. Volunteers to transform this 54 Most of the time, such problems are due to an incorrect usage of
48 to man pages, please contact jloup@gzip.org. Examples of zlib usage 55 zlib. Please try to reproduce the problem with a small program and send
49 are in the files example.c and minigzip.c. 56 the corresponding source to us at zlib@gzip.org . Do not send
57 multi-megabyte data files without prior agreement.
50 58
59 9. Why do I get "undefined reference to gzputc"?
51 60
526) Why don't you use GNU autoconf, libtool, etc...? 61 If "make test" produces something like
53 62
54 Because we would like to keep zlib as a very small and simple package. 63 example.o(.text+0x154): undefined reference to `gzputc'
55 zlib is rather portable and doesn't need much configuration. 64
65 check that you don't have old files libz.* in /usr/lib, /usr/local/lib or
66 /usr/X11R6/lib. Remove any old versions, then do "make install".
56 67
6810. I need a Delphi interface to zlib.
57 69
587) There is a bug in zlib. 70 See the directories contrib/delphi and contrib/delphi2 in the zlib
71 distribution.
59 72
60 Most of the time, such problems are due to an incorrect usage 7311. Can zlib handle .zip archives?
61 of zlib. Please try to reproduce the problem with a small
62 program and send us the corresponding source at zlib@quest.jpl.nasa.gov
63 Do not send multi-megabyte data files without prior agreement.
64 74
75 See the directory contrib/minizip in the zlib distribution.
65 76
668) I get "undefined reference to gzputc" 7712. Can zlib handle .Z files?
67 78
68 If "make test" produces something like 79 No, sorry. You have to spawn an uncompress or gunzip subprocess, or adapt
69 example.o(.text+0x174): 80 the code of uncompress on your own.
70 check that you don't have old files libz.* in /usr/lib, /usr/local/lib
71 or /usr/X11R6/lib. Remove old versions then do "make install".
72 81
8213. How can I make a Unix shared library?
83
84 make clean
85 ./configure -s
86 make
87
8814. Why does "make test" fail on Mac OS X?
89
90 Mac OS X already includes zlib as a shared library, and so -lz links the
91 shared library instead of the one that the "make" compiled. For zlib
92 1.1.3, the two are incompatible due to different compile-time
93 options. Simply change the -lz in the Makefile to libz.a, and it will use
94 the compiled library instead of the shared one and the "make test" will
95 succeed.
96
9715. I have a question about OttoPDF
98
99 We are not the authors of OttoPDF. The real author is on the OttoPDF web
100 site Joel Hainley jhainley@myndkryme.com.
diff --git a/Makefile b/Makefile
index 3a3b116..531562b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
1# Makefile for zlib 1# Makefile for zlib
2# Copyright (C) 1995-1998 Jean-loup Gailly. 2# Copyright (C) 1995-2002 Jean-loup Gailly.
3# For conditions of distribution and use, see copyright notice in zlib.h 3# For conditions of distribution and use, see copyright notice in zlib.h
4 4
5# To compile and test, type: 5# To compile and test, type:
@@ -24,7 +24,7 @@ LDFLAGS=-L. -lz
24LDSHARED=$(CC) 24LDSHARED=$(CC)
25CPP=$(CC) -E 25CPP=$(CC) -E
26 26
27VER=1.1.3 27VER=1.1.4
28LIBS=libz.a 28LIBS=libz.a
29SHAREDLIB=libz.so 29SHAREDLIB=libz.so
30 30
@@ -47,7 +47,8 @@ OBJA =
47TEST_OBJS = example.o minigzip.o 47TEST_OBJS = example.o minigzip.o
48 48
49DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \ 49DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \
50 algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \ 50 algorithm.txt zlib.3 zlib.html \
51 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
51 nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \ 52 nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \
52 contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \ 53 contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \
53 contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \ 54 contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \
diff --git a/Makefile.in b/Makefile.in
index 3a3b116..531562b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,5 +1,5 @@
1# Makefile for zlib 1# Makefile for zlib
2# Copyright (C) 1995-1998 Jean-loup Gailly. 2# Copyright (C) 1995-2002 Jean-loup Gailly.
3# For conditions of distribution and use, see copyright notice in zlib.h 3# For conditions of distribution and use, see copyright notice in zlib.h
4 4
5# To compile and test, type: 5# To compile and test, type:
@@ -24,7 +24,7 @@ LDFLAGS=-L. -lz
24LDSHARED=$(CC) 24LDSHARED=$(CC)
25CPP=$(CC) -E 25CPP=$(CC) -E
26 26
27VER=1.1.3 27VER=1.1.4
28LIBS=libz.a 28LIBS=libz.a
29SHAREDLIB=libz.so 29SHAREDLIB=libz.so
30 30
@@ -47,7 +47,8 @@ OBJA =
47TEST_OBJS = example.o minigzip.o 47TEST_OBJS = example.o minigzip.o
48 48
49DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \ 49DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \
50 algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \ 50 algorithm.txt zlib.3 zlib.html \
51 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
51 nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \ 52 nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \
52 contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \ 53 contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \
53 contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \ 54 contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \
diff --git a/README b/README
index 8ff4587..29d6714 100644
--- a/README
+++ b/README
@@ -1,7 +1,7 @@
1zlib 1.1.3 is a general purpose data compression library. All the code 1zlib 1.1.4 is a general purpose data compression library. All the code
2is thread safe. The data format used by the zlib library 2is thread safe. The data format used by the zlib library
3is described by RFCs (Request for Comments) 1950 to 1952 in the files 3is described by RFCs (Request for Comments) 1950 to 1952 in the files
4ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate 4http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate
5format) and rfc1952.txt (gzip format). These documents are also available in 5format) and rfc1952.txt (gzip format). These documents are also available in
6other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html 6other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
7 7
@@ -14,51 +14,50 @@ except example.c and minigzip.c.
14 14
15To compile all files and run the test program, follow the instructions 15To compile all files and run the test program, follow the instructions
16given at the top of Makefile. In short "make test; make install" 16given at the top of Makefile. In short "make test; make install"
17should work for most machines. For Unix: "configure; make test; make install" 17should work for most machines. For Unix: "./configure; make test; make install"
18For MSDOS, use one of the special makefiles such as Makefile.msc. 18For MSDOS, use one of the special makefiles such as Makefile.msc.
19For VMS, use Make_vms.com or descrip.mms. 19For VMS, use Make_vms.com or descrip.mms.
20 20
21Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov>, or to 21Questions about zlib should be sent to <zlib@gzip.org>, or to
22Gilles Vollant <info@winimage.com> for the Windows DLL version. 22Gilles Vollant <info@winimage.com> for the Windows DLL version.
23The zlib home page is http://www.cdrom.com/pub/infozip/zlib/ 23The zlib home page is http://www.zlib.org or http://www.gzip.org/zlib/
24The official zlib ftp site is ftp://ftp.cdrom.com/pub/infozip/zlib/ 24Before reporting a problem, please check this site to verify that
25Before reporting a problem, please check those sites to verify that
26you have the latest version of zlib; otherwise get the latest version and 25you have the latest version of zlib; otherwise get the latest version and
27check whether the problem still exists or not. 26check whether the problem still exists or not.
28 27
29Mark Nelson <markn@tiny.com> wrote an article about zlib for the Jan. 1997 28PLEASE read the zlib FAQ http://www.gzip.org/zlib/zlib_faq.html
29before asking for help.
30
31Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
30issue of Dr. Dobb's Journal; a copy of the article is available in 32issue of Dr. Dobb's Journal; a copy of the article is available in
31http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm 33http://dogma.net/markn/articles/zlibtool/zlibtool.htm
32 34
33The changes made in version 1.1.3 are documented in the file ChangeLog. 35The changes made in version 1.1.4 are documented in the file ChangeLog.
34The main changes since 1.1.2 are: 36The only changes made since 1.1.3 are bug corrections:
35 37
36- fix "an inflate input buffer bug that shows up on rare but persistent 38- ZFREE was repeated on same allocation on some error conditions.
37 occasions" (Mark) 39 This creates a security problem described in
38- fix gzread and gztell for concatenated .gz files (Didier Le Botlan) 40 http://www.zlib.org/advisory-2002-03-11.txt
39- fix gzseek(..., SEEK_SET) in write mode 41- Returned incorrect error (Z_MEM_ERROR) on some invalid data
40- fix crc check after a gzeek (Frank Faubert) 42- Avoid accesses before window for invalid distances with inflate window
41- fix miniunzip when the last entry in a zip file is itself a zip file 43 less than 32K.
42 (J Lillge) 44- force windowBits > 8 to avoid a bug in the encoder for a window size
43- add contrib/asm586 and contrib/asm686 (Brian Raiter) 45 of 256 bytes. (A complete fix will be available in 1.1.5).
44 See http://www.muppetlabs.com/~breadbox/software/assembly.html 46
45- add support for Delphi 3 in contrib/delphi (Bob Dellaca) 47The beta version 1.1.5beta includes many more changes. A new official
46- add support for C++Builder 3 and Delphi 3 in contrib/delphi2 (Davide Moretti) 48version 1.1.5 will be released as soon as extensive testing has been
47- do not exit prematurely in untgz if 0 at start of block (Magnus Holmgren) 49completed on it.
48- use macro EXTERN instead of extern to support DLL for BeOS (Sander Stoks) 50
49- added a FAQ file
50
51plus many changes for portability.
52 51
53Unsupported third party contributions are provided in directory "contrib". 52Unsupported third party contributions are provided in directory "contrib".
54 53
55A Java implementation of zlib is available in the Java Development Kit 1.1 54A Java implementation of zlib is available in the Java Development Kit
56http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html 55http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
57See the zlib home page http://www.cdrom.com/pub/infozip/zlib/ for details. 56See the zlib home page http://www.zlib.org for details.
58 57
59A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk> 58A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
60is in the CPAN (Comprehensive Perl Archive Network) sites, such as: 59is in the CPAN (Comprehensive Perl Archive Network) sites
61ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib* 60http://www.cpan.org/modules/by-module/Compress/
62 61
63A Python interface to zlib written by A.M. Kuchling <amk@magnet.com> 62A Python interface to zlib written by A.M. Kuchling <amk@magnet.com>
64is available in Python 1.5 and later versions, see 63is available in Python 1.5 and later versions, see
@@ -117,7 +116,7 @@ Acknowledgments:
117 116
118Copyright notice: 117Copyright notice:
119 118
120 (C) 1995-1998 Jean-loup Gailly and Mark Adler 119 (C) 1995-2002 Jean-loup Gailly and Mark Adler
121 120
122 This software is provided 'as-is', without any express or implied 121 This software is provided 'as-is', without any express or implied
123 warranty. In no event will the authors be held liable for any damages 122 warranty. In no event will the authors be held liable for any damages
diff --git a/adler32.c b/adler32.c
index 16cf9a7..fae88b6 100644
--- a/adler32.c
+++ b/adler32.c
@@ -1,5 +1,5 @@
1/* adler32.c -- compute the Adler-32 checksum of a data stream 1/* adler32.c -- compute the Adler-32 checksum of a data stream
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/compress.c b/compress.c
index 1cee470..814bd9d 100644
--- a/compress.c
+++ b/compress.c
@@ -1,5 +1,5 @@
1/* compress.c -- compress a memory buffer 1/* compress.c -- compress a memory buffer
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/crc32.c b/crc32.c
index a91101a..60deca2 100644
--- a/crc32.c
+++ b/crc32.c
@@ -1,5 +1,5 @@
1/* crc32.c -- compute the CRC-32 of a data stream 1/* crc32.c -- compute the CRC-32 of a data stream
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/deflate.c b/deflate.c
index 25d5818..16ebdad 100644
--- a/deflate.c
+++ b/deflate.c
@@ -1,5 +1,5 @@
1/* deflate.c -- compress data using the deflation algorithm 1/* deflate.c -- compress data using the deflation algorithm
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
@@ -52,7 +52,7 @@
52#include "deflate.h" 52#include "deflate.h"
53 53
54const char deflate_copyright[] = 54const char deflate_copyright[] =
55 " deflate 1.1.3 Copyright 1995-1998 Jean-loup Gailly "; 55 " deflate 1.1.4 Copyright 1995-2002 Jean-loup Gailly ";
56/* 56/*
57 If you use the zlib library in a product, an acknowledgment is welcome 57 If you use the zlib library in a product, an acknowledgment is welcome
58 in the documentation of your product. If for some reason you cannot 58 in the documentation of your product. If for some reason you cannot
@@ -242,7 +242,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
242 windowBits = -windowBits; 242 windowBits = -windowBits;
243 } 243 }
244 if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || 244 if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
245 windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || 245 windowBits < 9 || windowBits > 15 || level < 0 || level > 9 ||
246 strategy < 0 || strategy > Z_HUFFMAN_ONLY) { 246 strategy < 0 || strategy > Z_HUFFMAN_ONLY) {
247 return Z_STREAM_ERROR; 247 return Z_STREAM_ERROR;
248 } 248 }
diff --git a/deflate.h b/deflate.h
index 962676d..b99a48a 100644
--- a/deflate.h
+++ b/deflate.h
@@ -1,5 +1,5 @@
1/* deflate.h -- internal compression state 1/* deflate.h -- internal compression state
2 * Copyright (C) 1995-1998 Jean-loup Gailly 2 * Copyright (C) 1995-2002 Jean-loup Gailly
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/example.c b/example.c
index 8307c84..e7e3673 100644
--- a/example.c
+++ b/example.c
@@ -1,5 +1,5 @@
1/* example.c -- usage example of the zlib compression library 1/* example.c -- usage example of the zlib compression library
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/gzio.c b/gzio.c
index f7c336a..09e0a20 100644
--- a/gzio.c
+++ b/gzio.c
@@ -1,5 +1,5 @@
1/* gzio.c -- IO on .gz files 1/* gzio.c -- IO on .gz files
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 * 4 *
5 * Compile this file with -DNO_DEFLATE to avoid the compression code. 5 * Compile this file with -DNO_DEFLATE to avoid the compression code.
diff --git a/infblock.c b/infblock.c
index f4920fa..dd7a6d4 100644
--- a/infblock.c
+++ b/infblock.c
@@ -1,5 +1,5 @@
1/* infblock.c -- interpret and process block types to last block 1/* infblock.c -- interpret and process block types to last block
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
@@ -249,10 +249,12 @@ int r;
249 &s->sub.trees.tb, s->hufts, z); 249 &s->sub.trees.tb, s->hufts, z);
250 if (t != Z_OK) 250 if (t != Z_OK)
251 { 251 {
252 ZFREE(z, s->sub.trees.blens);
253 r = t; 252 r = t;
254 if (r == Z_DATA_ERROR) 253 if (r == Z_DATA_ERROR)
254 {
255 ZFREE(z, s->sub.trees.blens);
255 s->mode = BAD; 256 s->mode = BAD;
257 }
256 LEAVE 258 LEAVE
257 } 259 }
258 s->sub.trees.index = 0; 260 s->sub.trees.index = 0;
@@ -313,11 +315,13 @@ int r;
313 t = inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), 315 t = inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f),
314 s->sub.trees.blens, &bl, &bd, &tl, &td, 316 s->sub.trees.blens, &bl, &bd, &tl, &td,
315 s->hufts, z); 317 s->hufts, z);
316 ZFREE(z, s->sub.trees.blens);
317 if (t != Z_OK) 318 if (t != Z_OK)
318 { 319 {
319 if (t == (uInt)Z_DATA_ERROR) 320 if (t == (uInt)Z_DATA_ERROR)
321 {
322 ZFREE(z, s->sub.trees.blens);
320 s->mode = BAD; 323 s->mode = BAD;
324 }
321 r = t; 325 r = t;
322 LEAVE 326 LEAVE
323 } 327 }
@@ -329,6 +333,7 @@ int r;
329 } 333 }
330 s->sub.decode.codes = c; 334 s->sub.decode.codes = c;
331 } 335 }
336 ZFREE(z, s->sub.trees.blens);
332 s->mode = CODES; 337 s->mode = CODES;
333 case CODES: 338 case CODES:
334 UPDATE 339 UPDATE
diff --git a/infblock.h b/infblock.h
index bd25c80..173b226 100644
--- a/infblock.h
+++ b/infblock.h
@@ -1,5 +1,5 @@
1/* infblock.h -- header to use infblock.c 1/* infblock.h -- header to use infblock.c
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/infcodes.c b/infcodes.c
index d4e5ee9..9abe541 100644
--- a/infcodes.c
+++ b/infcodes.c
@@ -1,5 +1,5 @@
1/* infcodes.c -- process literals and length/distance pairs 1/* infcodes.c -- process literals and length/distance pairs
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
@@ -196,15 +196,9 @@ int r;
196 Tracevv((stderr, "inflate: distance %u\n", c->sub.copy.dist)); 196 Tracevv((stderr, "inflate: distance %u\n", c->sub.copy.dist));
197 c->mode = COPY; 197 c->mode = COPY;
198 case COPY: /* o: copying bytes in window, waiting for space */ 198 case COPY: /* o: copying bytes in window, waiting for space */
199#ifndef __TURBOC__ /* Turbo C bug for following expression */
200 f = (uInt)(q - s->window) < c->sub.copy.dist ?
201 s->end - (c->sub.copy.dist - (q - s->window)) :
202 q - c->sub.copy.dist;
203#else
204 f = q - c->sub.copy.dist; 199 f = q - c->sub.copy.dist;
205 if ((uInt)(q - s->window) < c->sub.copy.dist) 200 while (f < s->window) /* modulo window size-"while" instead */
206 f = s->end - (c->sub.copy.dist - (uInt)(q - s->window)); 201 f += s->end - s->window; /* of "if" handles invalid distances */
207#endif
208 while (c->len) 202 while (c->len)
209 { 203 {
210 NEEDOUT 204 NEEDOUT
diff --git a/infcodes.h b/infcodes.h
index 6c750d8..46821a0 100644
--- a/infcodes.h
+++ b/infcodes.h
@@ -1,5 +1,5 @@
1/* infcodes.h -- header to use infcodes.c 1/* infcodes.h -- header to use infcodes.c
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/inffast.c b/inffast.c
index 61a78ee..aa7f1d4 100644
--- a/inffast.c
+++ b/inffast.c
@@ -1,5 +1,5 @@
1/* inffast.c -- process literals and length/distance pairs fast 1/* inffast.c -- process literals and length/distance pairs fast
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
@@ -93,28 +93,41 @@ z_streamp z;
93 93
94 /* do the copy */ 94 /* do the copy */
95 m -= c; 95 m -= c;
96 if ((uInt)(q - s->window) >= d) /* offset before dest */ 96 r = q - d;
97 { /* just copy */ 97 if (r < s->window) /* wrap if needed */
98 r = q - d;
99 *q++ = *r++; c--; /* minimum count is three, */
100 *q++ = *r++; c--; /* so unroll loop a little */
101 }
102 else /* else offset after destination */
103 { 98 {
104 e = d - (uInt)(q - s->window); /* bytes from offset to end */ 99 do {
105 r = s->end - e; /* pointer to offset */ 100 r += s->end - s->window; /* force pointer in window */
106 if (c > e) /* if source crosses, */ 101 } while (r < s->window); /* covers invalid distances */
102 e = s->end - r;
103 if (c > e)
107 { 104 {
108 c -= e; /* copy to end of window */ 105 c -= e; /* wrapped copy */
109 do { 106 do {
110 *q++ = *r++; 107 *q++ = *r++;
111 } while (--e); 108 } while (--e);
112 r = s->window; /* copy rest from start of window */ 109 r = s->window;
110 do {
111 *q++ = *r++;
112 } while (--c);
113 } 113 }
114 else /* normal copy */
115 {
116 *q++ = *r++; c--;
117 *q++ = *r++; c--;
118 do {
119 *q++ = *r++;
120 } while (--c);
121 }
122 }
123 else /* normal copy */
124 {
125 *q++ = *r++; c--;
126 *q++ = *r++; c--;
127 do {
128 *q++ = *r++;
129 } while (--c);
114 } 130 }
115 do { /* copy all or what's left */
116 *q++ = *r++;
117 } while (--c);
118 break; 131 break;
119 } 132 }
120 else if ((e & 64) == 0) 133 else if ((e & 64) == 0)
diff --git a/inffast.h b/inffast.h
index 8facec5..a31a4bb 100644
--- a/inffast.h
+++ b/inffast.h
@@ -1,5 +1,5 @@
1/* inffast.h -- header to use inffast.c 1/* inffast.h -- header to use inffast.c
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/inflate.c b/inflate.c
index 32e9b8d..dfb2e86 100644
--- a/inflate.c
+++ b/inflate.c
@@ -1,5 +1,5 @@
1/* inflate.c -- zlib interface to inflate modules 1/* inflate.c -- zlib interface to inflate modules
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/inftrees.c b/inftrees.c
index ef1e0b6..4c32ca3 100644
--- a/inftrees.c
+++ b/inftrees.c
@@ -1,5 +1,5 @@
1/* inftrees.c -- generate Huffman trees for efficient decoding 1/* inftrees.c -- generate Huffman trees for efficient decoding
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
@@ -11,7 +11,7 @@
11#endif 11#endif
12 12
13const char inflate_copyright[] = 13const char inflate_copyright[] =
14 " inflate 1.1.3 Copyright 1995-1998 Mark Adler "; 14 " inflate 1.1.4 Copyright 1995-2002 Mark Adler ";
15/* 15/*
16 If you use the zlib library in a product, an acknowledgment is welcome 16 If you use the zlib library in a product, an acknowledgment is welcome
17 in the documentation of your product. If for some reason you cannot 17 in the documentation of your product. If for some reason you cannot
@@ -104,8 +104,7 @@ uIntf *v; /* working area: values in order of bit length */
104/* Given a list of code lengths and a maximum table size, make a set of 104/* Given a list of code lengths and a maximum table size, make a set of
105 tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR 105 tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR
106 if the given code set is incomplete (the tables are still built in this 106 if the given code set is incomplete (the tables are still built in this
107 case), Z_DATA_ERROR if the input is invalid (an over-subscribed set of 107 case), or Z_DATA_ERROR if the input is invalid. */
108 lengths), or Z_MEM_ERROR if not enough memory. */
109{ 108{
110 109
111 uInt a; /* counter for codes of length k */ 110 uInt a; /* counter for codes of length k */
@@ -231,7 +230,7 @@ uIntf *v; /* working area: values in order of bit length */
231 230
232 /* allocate new table */ 231 /* allocate new table */
233 if (*hn + z > MANY) /* (note: doesn't matter for fixed) */ 232 if (*hn + z > MANY) /* (note: doesn't matter for fixed) */
234 return Z_MEM_ERROR; /* not enough memory */ 233 return Z_DATA_ERROR; /* overflow of MANY */
235 u[h] = q = hp + *hn; 234 u[h] = q = hp + *hn;
236 *hn += z; 235 *hn += z;
237 236
diff --git a/inftrees.h b/inftrees.h
index 85853e0..04b73b7 100644
--- a/inftrees.h
+++ b/inftrees.h
@@ -1,5 +1,5 @@
1/* inftrees.h -- header to use inftrees.c 1/* inftrees.h -- header to use inftrees.c
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/infutil.c b/infutil.c
index 824dab5..9a07622 100644
--- a/infutil.c
+++ b/infutil.c
@@ -1,5 +1,5 @@
1/* inflate_util.c -- data and routines common to blocks and codes 1/* inflate_util.c -- data and routines common to blocks and codes
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/infutil.h b/infutil.h
index 99d1135..4401df8 100644
--- a/infutil.h
+++ b/infutil.h
@@ -1,5 +1,5 @@
1/* infutil.h -- types and macros common to blocks and codes 1/* infutil.h -- types and macros common to blocks and codes
2 * Copyright (C) 1995-1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/maketree.c b/maketree.c
index 949d786..a16d4b1 100644
--- a/maketree.c
+++ b/maketree.c
@@ -1,5 +1,5 @@
1/* maketree.c -- make inffixed.h table for decoding fixed codes 1/* maketree.c -- make inffixed.h table for decoding fixed codes
2 * Copyright (C) 1998 Mark Adler 2 * Copyright (C) 1995-2002 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/minigzip.c b/minigzip.c
index 7215eae..97b7c2d 100644
--- a/minigzip.c
+++ b/minigzip.c
@@ -1,5 +1,5 @@
1/* minigzip.c -- simulate gzip using the zlib compression library 1/* minigzip.c -- simulate gzip using the zlib compression library
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/trees.c b/trees.c
index f01fb30..0a98405 100644
--- a/trees.c
+++ b/trees.c
@@ -1,5 +1,5 @@
1/* trees.c -- output deflated data using Huffman coding 1/* trees.c -- output deflated data using Huffman coding
2 * Copyright (C) 1995-1998 Jean-loup Gailly 2 * Copyright (C) 1995-2002 Jean-loup Gailly
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/uncompr.c b/uncompr.c
index d103321..a287714 100644
--- a/uncompr.c
+++ b/uncompr.c
@@ -1,5 +1,5 @@
1/* uncompr.c -- decompress a memory buffer 1/* uncompr.c -- decompress a memory buffer
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/zconf.h b/zconf.h
index 6d450fc..eb0ae2e 100644
--- a/zconf.h
+++ b/zconf.h
@@ -1,5 +1,5 @@
1/* zconf.h -- configuration of the zlib compression library 1/* zconf.h -- configuration of the zlib compression library
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/zlib.3 b/zlib.3
index 25c8495..3a6e450 100644
--- a/zlib.3
+++ b/zlib.3
@@ -1,4 +1,4 @@
1.TH ZLIB 3 "9 July 1998" 1.TH ZLIB 3 "11 March 2002"
2.SH NAME 2.SH NAME
3zlib \- compression/decompression library 3zlib \- compression/decompression library
4.SH SYNOPSIS 4.SH SYNOPSIS
@@ -81,8 +81,8 @@ These documents are also available in other formats from:
81.IP 81.IP
82ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html 82ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
83.SH AUTHORS 83.SH AUTHORS
84Version 1.1.3 84Version 1.1.4
85Copyright (C) 1995-1998 Jean-loup Gailly (jloup@gzip.org) 85Copyright (C) 1995-2002 Jean-loup Gailly (jloup@gzip.org)
86and Mark Adler (madler@alumni.caltech.edu). 86and Mark Adler (madler@alumni.caltech.edu).
87.LP 87.LP
88This software is provided "as-is," 88This software is provided "as-is,"
diff --git a/zlib.h b/zlib.h
index 49f56b4..52cb529 100644
--- a/zlib.h
+++ b/zlib.h
@@ -1,7 +1,7 @@
1/* zlib.h -- interface of the 'zlib' general purpose compression library 1/* zlib.h -- interface of the 'zlib' general purpose compression library
2 version 1.1.3, July 9th, 1998 2 version 1.1.4, March 11th, 2002
3 3
4 Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler 4 Copyright (C) 1995-2002 Jean-loup Gailly and Mark Adler
5 5
6 This software is provided 'as-is', without any express or implied 6 This software is provided 'as-is', without any express or implied
7 warranty. In no event will the authors be held liable for any damages 7 warranty. In no event will the authors be held liable for any damages
@@ -37,7 +37,7 @@
37extern "C" { 37extern "C" {
38#endif 38#endif
39 39
40#define ZLIB_VERSION "1.1.3" 40#define ZLIB_VERSION "1.1.4"
41 41
42/* 42/*
43 The 'zlib' compression library provides in-memory compression and 43 The 'zlib' compression library provides in-memory compression and
diff --git a/zlib.html b/zlib.html
new file mode 100644
index 0000000..c343703
--- /dev/null
+++ b/zlib.html
@@ -0,0 +1,971 @@
1<html>
2<head>
3 <title>
4 zlib general purpose compression library version 1.1.4
5 </title>
6</head>
7<body bgcolor="White" text="Black" vlink="Red" alink="Navy" link="Red">
8<!-- background="zlibbg.gif" -->
9
10<h1> zlib 1.1.4 Manual </h1>
11<hr>
12<a name="Contents"><h2>Contents</h2>
13<ol type="I">
14<li> <a href="#Prologue">Prologue</a>
15<li> <a href="#Introduction">Introduction</a>
16<li> <a href="#Utility functions">Utility functions</a>
17<li> <a href="#Basic functions">Basic functions</a>
18<li> <a href="#Advanced functions">Advanced functions</a>
19<li> <a href="#Constants">Constants</a>
20<li> <a href="#struct z_stream_s">struct z_stream_s</a>
21<li> <a href="#Checksum functions">Checksum functions</a>
22<li> <a href="#Misc">Misc</a>
23</ol>
24<hr>
25<a name="Prologue"><h2> Prologue </h2>
26 'zlib' general purpose compression library version 1.1.4, March 11th, 2002
27 <p>
28 Copyright (C) 1995-2002 Jean-loup Gailly and Mark Adler
29 <p>
30 This software is provided 'as-is', without any express or implied
31 warranty. In no event will the authors be held liable for any damages
32 arising from the use of this software.
33 <p>
34 Permission is granted to anyone to use this software for any purpose,
35 including commercial applications, and to alter it and redistribute it
36 freely, subject to the following restrictions:
37 <ol>
38 <li> The origin of this software must not be misrepresented ; you must not
39 claim that you wrote the original software. If you use this software
40 in a product, an acknowledgment in the product documentation would be
41 appreciated but is not required.
42 <li> Altered source versions must be plainly marked as such, and must not be
43 misrepresented as being the original software.
44 <li> This notice may not be removed or altered from any source distribution.
45 </ol>
46
47 <dl>
48 <dt>Jean-loup Gailly
49 <dd><a href="mailto:jloup@gzip.org">jloup@gzip.org</a>
50 <dt>Mark Adler
51 <dd><a href="mailto:madler@alumni.caltech.edu">madler@alumni.caltech.edu</a>
52 </dl>
53
54 The data format used by the zlib library is described by RFCs (Request for
55 Comments) 1950 to 1952 in the files
56 <a href="ftp://ds.internic.net/rfc/rfc1950.txt">
57 ftp://ds.internic.net/rfc/rfc1950.txt </a>
58 (zlib format),
59 <a href="ftp://ds.internic.net/rfc/rfc1951.txt">
60 rfc1951.txt </a>
61 (<a href="#deflate">deflate</a> format) and
62 <a href="ftp://ds.internic.net/rfc/rfc1952.txt">
63 rfc1952.txt </a>
64 (gzip format).
65 <p>
66 This manual is converted from zlib.h by
67 <a href="mailto:piaip@csie.ntu.edu.tw"> piaip </a>
68 <p>
69 Visit <a href="http://ftp.cdrom.com/pub/infozip/zlib/">
70 http://ftp.cdrom.com/pub/infozip/zlib/</a>
71 for the official zlib web page.
72 <p>
73
74<hr>
75<a name="Introduction"><h2> Introduction </h2>
76 The 'zlib' compression library provides in-memory compression and
77 decompression functions, including integrity checks of the uncompressed
78 data. This version of the library supports only one compression method
79 (deflation) but other algorithms will be added later and will have the same
80 stream interface.
81 <p>
82
83 Compression can be done in a single step if the buffers are large
84 enough (for example if an input file is mmap'ed), or can be done by
85 repeated calls of the compression function. In the latter case, the
86 application must provide more input and/or consume the output
87 (providing more output space) before each call.
88 <p>
89
90 The library also supports reading and writing files in gzip (.gz) format
91 with an interface similar to that of stdio.
92 <p>
93
94 The library does not install any signal handler. The decoder checks
95 the consistency of the compressed data, so the library should never
96 crash even in case of corrupted input.
97 <p>
98
99<hr>
100<a name="Utility functions"><h2> Utility functions </h2>
101 The following utility functions are implemented on top of the
102 <a href="#Basic functions">basic stream-oriented functions</a>.
103 To simplify the interface, some
104 default options are assumed (compression level and memory usage,
105 standard memory allocation functions). The source code of these
106 utility functions can easily be modified if you need special options.
107<h3> Function list </h3>
108<ul>
109<li> int <a href="#compress">compress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);
110<li> int <a href="#compress2">compress2</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level);
111<li> int <a href="#uncompress">uncompress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);
112<li> typedef voidp gzFile;
113<li> gzFile <a href="#gzopen">gzopen</a> (const char *path, const char *mode);
114<li> gzFile <a href="#gzdopen">gzdopen</a> (int fd, const char *mode);
115<li> int <a href="#gzsetparams">gzsetparams</a> (gzFile file, int level, int strategy);
116<li> int <a href="#gzread">gzread</a> (gzFile file, voidp buf, unsigned len);
117<li> int <a href="#gzwrite">gzwrite</a> (gzFile file, const voidp buf, unsigned len);
118<li> int VA <a href="#gzprintf">gzprintf</a> (gzFile file, const char *format, ...);
119<li> int <a href="#gzputs">gzputs</a> (gzFile file, const char *s);
120<li> char * <a href="#gzgets">gzgets</a> (gzFile file, char *buf, int len);
121<li> int <a href="#gzputc">gzputc</a> (gzFile file, int c);
122<li> int <a href="#gzgetc">gzgetc</a> (gzFile file);
123<li> int <a href="#gzflush">gzflush</a> (gzFile file, int flush);
124<li> z_off_t <a href="#gzseek">gzseek</a> (gzFile file, z_off_t offset, int whence);
125<li> z_off_t <a href="#gztell">gztell</a> (gzFile file);
126<li> int <a href="#gzrewind">gzrewind</a> (gzFile file);
127<li> int <a href="#gzeof">gzeof</a> (gzFile file);
128<li> int <a href="#gzclose">gzclose</a> (gzFile file);
129<li> const char * <a href="#gzerror">gzerror</a> (gzFile file, int *errnum);
130</ul>
131<h3> Function description </h3>
132<dl>
133<font color="Blue"><dt> int <a name="compress">compress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);</font>
134<dd>
135 Compresses the source buffer into the destination buffer. sourceLen is
136 the byte length of the source buffer. Upon entry, destLen is the total
137 size of the destination buffer, which must be at least 0.1% larger than
138 sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the
139 compressed buffer.<p>
140 This function can be used to <a href="#compress">compress</a> a whole file at once if the
141 input file is mmap'ed.<p>
142 <a href="#compress">compress</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
143 enough memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if there was not enough room in the output
144 buffer.<p>
145
146<font color="Blue"><dt> int <a name="compress2">compress2</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level);</font>
147<dd>
148 Compresses the source buffer into the destination buffer. The level
149 parameter has the same meaning as in <a href="#deflateInit">deflateInit</a>. sourceLen is the byte
150 length of the source buffer. Upon entry, destLen is the total size of the
151 destination buffer, which must be at least 0.1% larger than sourceLen plus
152 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
153 <p>
154
155 <a href="#compress2">compress2</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
156 memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if there was not enough room in the output buffer,
157 <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the level parameter is invalid.
158 <p>
159
160<font color="Blue"><dt> int <a name="uncompress">uncompress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);</font>
161<dd>
162 Decompresses the source buffer into the destination buffer. sourceLen is
163 the byte length of the source buffer. Upon entry, destLen is the total
164 size of the destination buffer, which must be large enough to hold the
165 entire uncompressed data. (The size of the uncompressed data must have
166 been saved previously by the compressor and transmitted to the decompressor
167 by some mechanism outside the scope of this compression library.)
168 Upon exit, destLen is the actual size of the compressed buffer. <p>
169 This function can be used to decompress a whole file at once if the
170 input file is mmap'ed.
171 <p>
172
173 <a href="#uncompress">uncompress</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
174 enough memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if there was not enough room in the output
175 buffer, or <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the input data was corrupted.
176 <p>
177
178<dt> typedef voidp gzFile;
179<dd> <p>
180
181<font color="Blue"><dt> gzFile <a name="gzopen">gzopen</a> (const char *path, const char *mode);</font>
182<dd>
183 Opens a gzip (.gz) file for reading or writing. The mode parameter
184 is as in fopen ("rb" or "wb") but can also include a compression level
185 ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for
186 Huffman only compression as in "wb1h". (See the description
187 of <a href="#deflateInit2">deflateInit2</a> for more information about the strategy parameter.)
188 <p>
189
190 <a href="#gzopen">gzopen</a> can be used to read a file which is not in gzip format ; in this
191 case <a href="#gzread">gzread</a> will directly read from the file without decompression.
192 <p>
193
194 <a href="#gzopen">gzopen</a> returns NULL if the file could not be opened or if there was
195 insufficient memory to allocate the (de)compression <a href="#state">state</a> ; errno
196 can be checked to distinguish the two cases (if errno is zero, the
197 zlib error is <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a>).
198 <p>
199
200<font color="Blue"><dt> gzFile <a name="gzdopen">gzdopen</a> (int fd, const char *mode);</font>
201<dd>
202 <a href="#gzdopen">gzdopen</a>() associates a gzFile with the file descriptor fd. File
203 descriptors are obtained from calls like open, dup, creat, pipe or
204 fileno (in the file has been previously opened with fopen).
205 The mode parameter is as in <a href="#gzopen">gzopen</a>.
206 <p>
207 The next call of <a href="#gzclose">gzclose</a> on the returned gzFile will also close the
208 file descriptor fd, just like fclose(fdopen(fd), mode) closes the file
209 descriptor fd. If you want to keep fd open, use <a href="#gzdopen">gzdopen</a>(dup(fd), mode).
210 <p>
211 <a href="#gzdopen">gzdopen</a> returns NULL if there was insufficient memory to allocate
212 the (de)compression <a href="#state">state</a>.
213 <p>
214
215<font color="Blue"><dt> int <a name="gzsetparams">gzsetparams</a> (gzFile file, int level, int strategy);</font>
216<dd>
217 Dynamically update the compression level or strategy. See the description
218 of <a href="#deflateInit2">deflateInit2</a> for the meaning of these parameters.
219 <p>
220 <a href="#gzsetparams">gzsetparams</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the file was not
221 opened for writing.
222 <p>
223
224<font color="Blue"><dt> int <a name="gzread">gzread</a> (gzFile file, voidp buf, unsigned len);</font>
225<dd>
226 Reads the given number of uncompressed bytes from the compressed file.
227 If the input file was not in gzip format, <a href="#gzread">gzread</a> copies the given number
228 of bytes into the buffer.
229 <p>
230 <a href="#gzread">gzread</a> returns the number of uncompressed bytes actually read (0 for
231 end of file, -1 for error).
232 <p>
233
234<font color="Blue"><dt> int <a name="gzwrite">gzwrite</a> (gzFile file, const voidp buf, unsigned len);</font>
235<dd>
236 Writes the given number of uncompressed bytes into the compressed file.
237 <a href="#gzwrite">gzwrite</a> returns the number of uncompressed bytes actually written
238 (0 in case of error).
239 <p>
240
241<font color="Blue"><dt> int VA <a name="gzprintf">gzprintf</a> (gzFile file, const char *format, ...);</font>
242<dd>
243 Converts, formats, and writes the args to the compressed file under
244 control of the format string, as in fprintf. <a href="#gzprintf">gzprintf</a> returns the number of
245 uncompressed bytes actually written (0 in case of error).
246 <p>
247
248<font color="Blue"><dt> int <a name="gzputs">gzputs</a> (gzFile file, const char *s);</font>
249<dd>
250 Writes the given null-terminated string to the compressed file, excluding
251 the terminating null character.
252 <p>
253 <a href="#gzputs">gzputs</a> returns the number of characters written, or -1 in case of error.
254 <p>
255
256<font color="Blue"><dt> char * <a name="gzgets">gzgets</a> (gzFile file, char *buf, int len);</font>
257<dd>
258 Reads bytes from the compressed file until len-1 characters are read, or
259 a newline character is read and transferred to buf, or an end-of-file
260 condition is encountered. The string is then terminated with a null
261 character.
262 <p>
263 <a href="#gzgets">gzgets</a> returns buf, or <a href="#Z_NULL">Z_NULL</a> in case of error.
264 <p>
265
266<font color="Blue"><dt> int <a name="gzputc">gzputc</a> (gzFile file, int c);</font>
267<dd>
268 Writes c, converted to an unsigned char, into the compressed file.
269 <a href="#gzputc">gzputc</a> returns the value that was written, or -1 in case of error.
270 <p>
271
272<font color="Blue"><dt> int <a name="gzgetc">gzgetc</a> (gzFile file);</font>
273<dd>
274 Reads one byte from the compressed file. <a href="#gzgetc">gzgetc</a> returns this byte
275 or -1 in case of end of file or error.
276 <p>
277
278<font color="Blue"><dt> int <a name="gzflush">gzflush</a> (gzFile file, int flush);</font>
279<dd>
280 Flushes all pending output into the compressed file. The parameter
281 flush is as in the <a href="#deflate">deflate</a>() function. The return value is the zlib
282 error number (see function <a href="#gzerror">gzerror</a> below). <a href="#gzflush">gzflush</a> returns <a href="#Z_OK">Z_OK</a> if
283 the flush parameter is <a href="#Z_FINISH">Z_FINISH</a> and all output could be flushed.
284 <p>
285 <a href="#gzflush">gzflush</a> should be called only when strictly necessary because it can
286 degrade compression.
287 <p>
288
289<font color="Blue"><dt> z_off_t <a name="gzseek">gzseek</a> (gzFile file, z_off_t offset, int whence);</font>
290<dd>
291 Sets the starting position for the next <a href="#gzread">gzread</a> or <a href="#gzwrite">gzwrite</a> on the
292 given compressed file. The offset represents a number of bytes in the
293 uncompressed data stream. The whence parameter is defined as in lseek(2);
294 the value SEEK_END is not supported.
295 <p>
296 If the file is opened for reading, this function is emulated but can be
297 extremely slow. If the file is opened for writing, only forward seeks are
298 supported ; <a href="#gzseek">gzseek</a> then compresses a sequence of zeroes up to the new
299 starting position.
300 <p>
301 <a href="#gzseek">gzseek</a> returns the resulting offset location as measured in bytes from
302 the beginning of the uncompressed stream, or -1 in case of error, in
303 particular if the file is opened for writing and the new starting position
304 would be before the current position.
305 <p>
306
307<font color="Blue"><dt> int <a name="gzrewind">gzrewind</a> (gzFile file);</font>
308<dd>
309 Rewinds the given file. This function is supported only for reading.
310 <p>
311 <a href="#gzrewind">gzrewind</a>(file) is equivalent to (int)<a href="#gzseek">gzseek</a>(file, 0L, SEEK_SET)
312 <p>
313
314<font color="Blue"><dt> z_off_t <a name="gztell">gztell</a> (gzFile file);</font>
315<dd>
316 Returns the starting position for the next <a href="#gzread">gzread</a> or <a href="#gzwrite">gzwrite</a> on the
317 given compressed file. This position represents a number of bytes in the
318 uncompressed data stream.
319 <p>
320
321 <a href="#gztell">gztell</a>(file) is equivalent to <a href="#gzseek">gzseek</a>(file, 0L, SEEK_CUR)
322 <p>
323
324<font color="Blue"><dt> int <a name="gzeof">gzeof</a> (gzFile file);</font>
325<dd>
326 Returns 1 when EOF has previously been detected reading the given
327 input stream, otherwise zero.
328 <p>
329
330<font color="Blue"><dt> int <a name="gzclose">gzclose</a> (gzFile file);</font>
331<dd>
332 Flushes all pending output if necessary, closes the compressed file
333 and deallocates all the (de)compression <a href="#state">state</a>. The return value is the zlib
334 error number (see function <a href="#gzerror">gzerror</a> below).
335 <p>
336
337<font color="Blue"><dt> const char * <a name="gzerror">gzerror</a> (gzFile file, int *errnum);</font>
338<dd>
339 Returns the error message for the last error which occurred on the
340 given compressed file. errnum is set to zlib error number. If an
341 error occurred in the file system and not in the compression library,
342 errnum is set to <a href="#Z_ERRNO">Z_ERRNO</a> and the application may consult errno
343 to get the exact error code.
344 <p>
345</dl>
346<hr>
347<a name="Basic functions"><h2> Basic functions </h2>
348<h3> Function list </h3>
349<ul>
350<li> const char * <a href="#zlibVersion">zlibVersion</a> (void);
351<li> int <a href="#deflateInit">deflateInit</a> (<a href="#z_streamp">z_streamp</a> strm, int level);
352<li> int <a href="#deflate">deflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);
353<li> int <a href="#deflateEnd">deflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);
354<li> int <a href="#inflateInit">inflateInit</a> (<a href="#z_streamp">z_streamp</a> strm);
355<li> int <a href="#inflate">inflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);
356<li> int <a href="#inflateEnd">inflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);
357</ul>
358
359<h3> Function description </h3>
360<dl>
361<font color="Blue"><dt> const char * <a name="zlibVersion">zlibVersion</a> (void);</font>
362<dd> The application can compare <a href="#zlibVersion">zlibVersion</a> and ZLIB_VERSION for consistency.
363 If the first character differs, the library code actually used is
364 not compatible with the zlib.h header file used by the application.
365 This check is automatically made by <a href="#deflateInit">deflateInit</a> and <a href="#inflateInit">inflateInit</a>.
366 <p>
367
368<font color="Blue"><dt> int <a name="deflateInit">deflateInit</a> (<a href="#z_streamp">z_streamp</a> strm, int level);</font>
369<dd>
370 Initializes the internal stream <a href="#state">state</a> for compression. The fields
371 <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized before by the caller.
372 If <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> are set to <a href="#Z_NULL">Z_NULL</a>, <a href="#deflateInit">deflateInit</a> updates them to
373 use default allocation functions.
374 <p>
375
376 The compression level must be <a href="#Z_DEFAULT_COMPRESSION">Z_DEFAULT_COMPRESSION</a>, or between 0 and 9:
377 1 gives best speed, 9 gives best compression, 0 gives no compression at
378 all (the input data is simply copied a block at a time).
379 <p>
380
381 <a href="#Z_DEFAULT_COMPRESSION">Z_DEFAULT_COMPRESSION</a> requests a default compromise between speed and
382 compression (currently equivalent to level 6).
383 <p>
384
385 <a href="#deflateInit">deflateInit</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
386 enough memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if level is not a valid compression level,
387 <a href="#Z_VERSION_ERROR">Z_VERSION_ERROR</a> if the zlib library version (<a href="#zlib_version">zlib_version</a>) is incompatible
388 with the version assumed by the caller (ZLIB_VERSION).
389 <a href="#msg">msg</a> is set to null if there is no error message. <a href="#deflateInit">deflateInit</a> does not
390 perform any compression: this will be done by <a href="#deflate">deflate</a>().
391 <p>
392
393<font color="Blue"><dt> int <a name="deflate">deflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);</font>
394<dd>
395 <a href="#deflate">deflate</a> compresses as much data as possible, and stops when the input
396 buffer becomes empty or the output buffer becomes full. It may introduce some
397 output latency (reading input without producing any output) except when
398 forced to flush.<p>
399
400 The detailed semantics are as follows. <a href="#deflate">deflate</a> performs one or both of the
401 following actions:
402
403 <ul>
404 <li> Compress more input starting at <a href="#next_in">next_in</a> and update <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a>
405 accordingly. If not all input can be processed (because there is not
406 enough room in the output buffer), <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a> are updated and
407 processing will resume at this point for the next call of <a href="#deflate">deflate</a>().
408
409 <li>
410 Provide more output starting at <a href="#next_out">next_out</a> and update <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a>
411 accordingly. This action is forced if the parameter flush is non zero.
412 Forcing flush frequently degrades the compression ratio, so this parameter
413 should be set only when necessary (in interactive applications).
414 Some output may be provided even if flush is not set.
415 </ul> <p>
416
417 Before the call of <a href="#deflate">deflate</a>(), the application should ensure that at least
418 one of the actions is possible, by providing more input and/or consuming
419 more output, and updating <a href="#avail_in">avail_in</a> or <a href="#avail_out">avail_out</a> accordingly ; <a href="#avail_out">avail_out</a>
420 should never be zero before the call. The application can consume the
421 compressed output when it wants, for example when the output buffer is full
422 (<a href="#avail_out">avail_out</a> == 0), or after each call of <a href="#deflate">deflate</a>(). If <a href="#deflate">deflate</a> returns <a href="#Z_OK">Z_OK</a>
423 and with zero <a href="#avail_out">avail_out</a>, it must be called again after making room in the
424 output buffer because there might be more output pending.
425 <p>
426
427 If the parameter flush is set to <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>, all pending output is
428 flushed to the output buffer and the output is aligned on a byte boundary, so
429 that the decompressor can get all input data available so far. (In particular
430 <a href="#avail_in">avail_in</a> is zero after the call if enough output space has been provided
431 before the call.) Flushing may degrade compression for some compression
432 algorithms and so it should be used only when necessary.
433 <p>
434
435 If flush is set to <a href="#Z_FULL_FLUSH">Z_FULL_FLUSH</a>, all output is flushed as with
436 <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>, and the compression <a href="#state">state</a> is reset so that decompression can
437 restart from this point if previous compressed data has been damaged or if
438 random access is desired. Using <a href="#Z_FULL_FLUSH">Z_FULL_FLUSH</a> too often can seriously degrade
439 the compression.
440 <p>
441
442 If <a href="#deflate">deflate</a> returns with <a href="#avail_out">avail_out</a> == 0, this function must be called again
443 with the same value of the flush parameter and more output space (updated
444 <a href="#avail_out">avail_out</a>), until the flush is complete (<a href="#deflate">deflate</a> returns with non-zero
445 <a href="#avail_out">avail_out</a>).
446 <p>
447
448 If the parameter flush is set to <a href="#Z_FINISH">Z_FINISH</a>, pending input is processed,
449 pending output is flushed and <a href="#deflate">deflate</a> returns with <a href="#Z_STREAM_END">Z_STREAM_END</a> if there
450 was enough output space ; if <a href="#deflate">deflate</a> returns with <a href="#Z_OK">Z_OK</a>, this function must be
451 called again with <a href="#Z_FINISH">Z_FINISH</a> and more output space (updated <a href="#avail_out">avail_out</a>) but no
452 more input data, until it returns with <a href="#Z_STREAM_END">Z_STREAM_END</a> or an error. After
453 <a href="#deflate">deflate</a> has returned <a href="#Z_STREAM_END">Z_STREAM_END</a>, the only possible operations on the
454 stream are <a href="#deflateReset">deflateReset</a> or <a href="#deflateEnd">deflateEnd</a>.
455 <p>
456
457 <a href="#Z_FINISH">Z_FINISH</a> can be used immediately after <a href="#deflateInit">deflateInit</a> if all the compression
458 is to be done in a single step. In this case, <a href="#avail_out">avail_out</a> must be at least
459 0.1% larger than <a href="#avail_in">avail_in</a> plus 12 bytes. If <a href="#deflate">deflate</a> does not return
460 <a href="#Z_STREAM_END">Z_STREAM_END</a>, then it must be called again as described above.
461 <p>
462
463 <a href="#deflate">deflate</a>() sets strm-&gt <a href="#adler">adler</a> to the <a href="#adler32">adler32</a> checksum of all input read
464 so far (that is, <a href="#total_in">total_in</a> bytes).
465 <p>
466
467 <a href="#deflate">deflate</a>() may update <a href="#data_type">data_type</a> if it can make a good guess about
468 the input data type (<a href="#Z_ASCII">Z_ASCII</a> or <a href="#Z_BINARY">Z_BINARY</a>). In doubt, the data is considered
469 binary. This field is only for information purposes and does not affect
470 the compression algorithm in any manner.
471 <p>
472
473 <a href="#deflate">deflate</a>() returns <a href="#Z_OK">Z_OK</a> if some progress has been made (more input
474 processed or more output produced), <a href="#Z_STREAM_END">Z_STREAM_END</a> if all input has been
475 consumed and all output has been produced (only when flush is set to
476 <a href="#Z_FINISH">Z_FINISH</a>), <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream <a href="#state">state</a> was inconsistent (for example
477 if <a href="#next_in">next_in</a> or <a href="#next_out">next_out</a> was NULL), <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if no progress is possible
478 (for example <a href="#avail_in">avail_in</a> or <a href="#avail_out">avail_out</a> was zero).
479 <p>
480
481<font color="Blue"><dt> int <a name="deflateEnd">deflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
482<dd>
483 All dynamically allocated data structures for this stream are freed.
484 This function discards any unprocessed input and does not flush any
485 pending output.
486 <p>
487
488 <a href="#deflateEnd">deflateEnd</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the
489 stream <a href="#state">state</a> was inconsistent, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the stream was freed
490 prematurely (some input or output was discarded). In the error case,
491 <a href="#msg">msg</a> may be set but then points to a static string (which must not be
492 deallocated).
493 <p>
494
495<font color="Blue"><dt> int <a name="inflateInit">inflateInit</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
496<dd>
497 Initializes the internal stream <a href="#state">state</a> for decompression. The fields
498 <a href="#next_in">next_in</a>, <a href="#avail_in">avail_in</a>, <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized before by
499 the caller. If <a href="#next_in">next_in</a> is not <a href="#Z_NULL">Z_NULL</a> and <a href="#avail_in">avail_in</a> is large enough (the exact
500 value depends on the compression method), <a href="#inflateInit">inflateInit</a> determines the
501 compression method from the zlib header and allocates all data structures
502 accordingly ; otherwise the allocation will be deferred to the first call of
503 <a href="#inflate">inflate</a>. If <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> are set to <a href="#Z_NULL">Z_NULL</a>, <a href="#inflateInit">inflateInit</a> updates them to
504 use default allocation functions.
505 <p>
506
507 <a href="#inflateInit">inflateInit</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
508 memory, <a href="#Z_VERSION_ERROR">Z_VERSION_ERROR</a> if the zlib library version is incompatible with the
509 version assumed by the caller. <a href="#msg">msg</a> is set to null if there is no error
510 message. <a href="#inflateInit">inflateInit</a> does not perform any decompression apart from reading
511 the zlib header if present: this will be done by <a href="#inflate">inflate</a>(). (So <a href="#next_in">next_in</a> and
512 <a href="#avail_in">avail_in</a> may be modified, but <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a> are unchanged.)
513 <p>
514
515<font color="Blue"><dt> int <a name="inflate">inflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);</font>
516<dd>
517 <a href="#inflate">inflate</a> decompresses as much data as possible, and stops when the input
518 buffer becomes empty or the output buffer becomes full. It may some
519 introduce some output latency (reading input without producing any output)
520 except when forced to flush.
521 <p>
522
523 The detailed semantics are as follows. <a href="#inflate">inflate</a> performs one or both of the
524 following actions:
525
526 <ul>
527 <li> Decompress more input starting at <a href="#next_in">next_in</a> and update <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a>
528 accordingly. If not all input can be processed (because there is not
529 enough room in the output buffer), <a href="#next_in">next_in</a> is updated and processing
530 will resume at this point for the next call of <a href="#inflate">inflate</a>().
531
532 <li> Provide more output starting at <a href="#next_out">next_out</a> and update <a href="#next_out">next_out</a> and
533 <a href="#avail_out">avail_out</a> accordingly. <a href="#inflate">inflate</a>() provides as much output as possible,
534 until there is no more input data or no more space in the output buffer
535 (see below about the flush parameter).
536 </ul> <p>
537
538 Before the call of <a href="#inflate">inflate</a>(), the application should ensure that at least
539 one of the actions is possible, by providing more input and/or consuming
540 more output, and updating the next_* and avail_* values accordingly.
541 The application can consume the uncompressed output when it wants, for
542 example when the output buffer is full (<a href="#avail_out">avail_out</a> == 0), or after each
543 call of <a href="#inflate">inflate</a>(). If <a href="#inflate">inflate</a> returns <a href="#Z_OK">Z_OK</a> and with zero <a href="#avail_out">avail_out</a>, it
544 must be called again after making room in the output buffer because there
545 might be more output pending.
546 <p>
547
548 If the parameter flush is set to <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>, <a href="#inflate">inflate</a> flushes as much
549 output as possible to the output buffer. The flushing behavior of <a href="#inflate">inflate</a> is
550 not specified for values of the flush parameter other than <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>
551 and <a href="#Z_FINISH">Z_FINISH</a>, but the current implementation actually flushes as much output
552 as possible anyway.
553 <p>
554
555 <a href="#inflate">inflate</a>() should normally be called until it returns <a href="#Z_STREAM_END">Z_STREAM_END</a> or an
556 error. However if all decompression is to be performed in a single step
557 (a single call of <a href="#inflate">inflate</a>), the parameter flush should be set to
558 <a href="#Z_FINISH">Z_FINISH</a>. In this case all pending input is processed and all pending
559 output is flushed ; <a href="#avail_out">avail_out</a> must be large enough to hold all the
560 uncompressed data. (The size of the uncompressed data may have been saved
561 by the compressor for this purpose.) The next operation on this stream must
562 be <a href="#inflateEnd">inflateEnd</a> to deallocate the decompression <a href="#state">state</a>. The use of <a href="#Z_FINISH">Z_FINISH</a>
563 is never required, but can be used to inform <a href="#inflate">inflate</a> that a faster routine
564 may be used for the single <a href="#inflate">inflate</a>() call.
565 <p>
566
567 If a preset dictionary is needed at this point (see <a href="#inflateSetDictionary">inflateSetDictionary</a>
568 below), <a href="#inflate">inflate</a> sets strm-<a href="#adler">adler</a> to the <a href="#adler32">adler32</a> checksum of the
569 dictionary chosen by the compressor and returns <a href="#Z_NEED_DICT">Z_NEED_DICT</a> ; otherwise
570 it sets strm-&gt <a href="#adler">adler</a> to the <a href="#adler32">adler32</a> checksum of all output produced
571 so far (that is, <a href="#total_out">total_out</a> bytes) and returns <a href="#Z_OK">Z_OK</a>, <a href="#Z_STREAM_END">Z_STREAM_END</a> or
572 an error code as described below. At the end of the stream, <a href="#inflate">inflate</a>()
573 checks that its computed <a href="#adler32">adler32</a> checksum is equal to that saved by the
574 compressor and returns <a href="#Z_STREAM_END">Z_STREAM_END</a> only if the checksum is correct.
575 <p>
576
577 <a href="#inflate">inflate</a>() returns <a href="#Z_OK">Z_OK</a> if some progress has been made (more input processed
578 or more output produced), <a href="#Z_STREAM_END">Z_STREAM_END</a> if the end of the compressed data has
579 been reached and all uncompressed output has been produced, <a href="#Z_NEED_DICT">Z_NEED_DICT</a> if a
580 preset dictionary is needed at this point, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the input data was
581 corrupted (input stream not conforming to the zlib format or incorrect
582 <a href="#adler32">adler32</a> checksum), <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream structure was inconsistent
583 (for example if <a href="#next_in">next_in</a> or <a href="#next_out">next_out</a> was NULL), <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
584 enough memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if no progress is possible or if there was not
585 enough room in the output buffer when <a href="#Z_FINISH">Z_FINISH</a> is used. In the <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a>
586 case, the application may then call <a href="#inflateSync">inflateSync</a> to look for a good
587 compression block.
588 <p>
589
590<font color="Blue"><dt> int <a name="inflateEnd">inflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
591<dd>
592 All dynamically allocated data structures for this stream are freed.
593 This function discards any unprocessed input and does not flush any
594 pending output.
595 <p>
596
597 <a href="#inflateEnd">inflateEnd</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream <a href="#state">state</a>
598 was inconsistent. In the error case, <a href="#msg">msg</a> may be set but then points to a
599 static string (which must not be deallocated).
600</dl>
601<hr>
602<a name="Advanced functions"><h2> Advanced functions </h2>
603 The following functions are needed only in some special applications.
604<h3> Function list </h3>
605<ul>
606<li> int <a href="#deflateInit2">deflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm,
607<li> int <a href="#deflateSetDictionary">deflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);
608<li> int <a href="#deflateCopy">deflateCopy</a> (<a href="#z_streamp">z_streamp</a> dest, <a href="#z_streamp">z_streamp</a> source);
609<li> int <a href="#deflateReset">deflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);
610<li> int <a href="#deflateParams">deflateParams</a> (<a href="#z_streamp">z_streamp</a> strm, int level, int strategy);
611<li> int <a href="#inflateInit2">inflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm, int windowBits);
612<li> int <a href="#inflateSetDictionary">inflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);
613<li> int <a href="#inflateSync">inflateSync</a> (<a href="#z_streamp">z_streamp</a> strm);
614<li> int <a href="#inflateReset">inflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);
615
616</ul>
617<h3> Function description </h3>
618<dl>
619<font color="Blue"><dt> int <a name="deflateInit2">deflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm, int level, int method, int windowBits, int memLevel, int strategy);</font>
620
621<dd> This is another version of <a href="#deflateInit">deflateInit</a> with more compression options. The
622 fields <a href="#next_in">next_in</a>, <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized before by
623 the caller.<p>
624
625 The method parameter is the compression method. It must be <a href="#Z_DEFLATED">Z_DEFLATED</a> in
626 this version of the library.<p>
627
628 The windowBits parameter is the base two logarithm of the window size
629 (the size of the history buffer). It should be in the range 8..15 for this
630 version of the library. Larger values of this parameter result in better
631 compression at the expense of memory usage. The default value is 15 if
632 <a href="#deflateInit">deflateInit</a> is used instead.<p>
633
634 The memLevel parameter specifies how much memory should be allocated
635 for the internal compression <a href="#state">state</a>. memLevel=1 uses minimum memory but
636 is slow and reduces compression ratio ; memLevel=9 uses maximum memory
637 for optimal speed. The default value is 8. See zconf.h for total memory
638 usage as a function of windowBits and memLevel.<p>
639
640 The strategy parameter is used to tune the compression algorithm. Use the
641 value <a href="#Z_DEFAULT_STRATEGY">Z_DEFAULT_STRATEGY</a> for normal data, <a href="#Z_FILTERED">Z_FILTERED</a> for data produced by a
642 filter (or predictor), or <a href="#Z_HUFFMAN_ONLY">Z_HUFFMAN_ONLY</a> to force Huffman encoding only (no
643 string match). Filtered data consists mostly of small values with a
644 somewhat random distribution. In this case, the compression algorithm is
645 tuned to <a href="#compress">compress</a> them better. The effect of <a href="#Z_FILTERED">Z_FILTERED</a> is to force more
646 Huffman coding and less string matching ; it is somewhat intermediate
647 between Z_DEFAULT and <a href="#Z_HUFFMAN_ONLY">Z_HUFFMAN_ONLY</a>. The strategy parameter only affects
648 the compression ratio but not the correctness of the compressed output even
649 if it is not set appropriately.<p>
650
651 <a href="#deflateInit2">deflateInit2</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
652 memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a parameter is invalid (such as an invalid
653 method). <a href="#msg">msg</a> is set to null if there is no error message. <a href="#deflateInit2">deflateInit2</a> does
654 not perform any compression: this will be done by <a href="#deflate">deflate</a>().<p>
655
656<font color="Blue"><dt> int <a name="deflateSetDictionary">deflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);</font>
657<dd>
658 Initializes the compression dictionary from the given byte sequence
659 without producing any compressed output. This function must be called
660 immediately after <a href="#deflateInit">deflateInit</a>, <a href="#deflateInit2">deflateInit2</a> or <a href="#deflateReset">deflateReset</a>, before any
661 call of <a href="#deflate">deflate</a>. The compressor and decompressor must use exactly the same
662 dictionary (see <a href="#inflateSetDictionary">inflateSetDictionary</a>).<p>
663
664 The dictionary should consist of strings (byte sequences) that are likely
665 to be encountered later in the data to be compressed, with the most commonly
666 used strings preferably put towards the end of the dictionary. Using a
667 dictionary is most useful when the data to be compressed is short and can be
668 predicted with good accuracy ; the data can then be compressed better than
669 with the default empty dictionary.<p>
670
671 Depending on the size of the compression data structures selected by
672 <a href="#deflateInit">deflateInit</a> or <a href="#deflateInit2">deflateInit2</a>, a part of the dictionary may in effect be
673 discarded, for example if the dictionary is larger than the window size in
674 <a href="#deflate">deflate</a> or deflate2. Thus the strings most likely to be useful should be
675 put at the end of the dictionary, not at the front.<p>
676
677 Upon return of this function, strm-&gt <a href="#adler">adler</a> is set to the Adler32 value
678 of the dictionary ; the decompressor may later use this value to determine
679 which dictionary has been used by the compressor. (The Adler32 value
680 applies to the whole dictionary even if only a subset of the dictionary is
681 actually used by the compressor.)<p>
682
683 <a href="#deflateSetDictionary">deflateSetDictionary</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a
684 parameter is invalid (such as NULL dictionary) or the stream <a href="#state">state</a> is
685 inconsistent (for example if <a href="#deflate">deflate</a> has already been called for this stream
686 or if the compression method is bsort). <a href="#deflateSetDictionary">deflateSetDictionary</a> does not
687 perform any compression: this will be done by <a href="#deflate">deflate</a>().<p>
688
689<font color="Blue"><dt> int <a name="deflateCopy">deflateCopy</a> (<a href="#z_streamp">z_streamp</a> dest, <a href="#z_streamp">z_streamp</a> source);</font>
690<dd>
691 Sets the destination stream as a complete copy of the source stream.<p>
692
693 This function can be useful when several compression strategies will be
694 tried, for example when there are several ways of pre-processing the input
695 data with a filter. The streams that will be discarded should then be freed
696 by calling <a href="#deflateEnd">deflateEnd</a>. Note that <a href="#deflateCopy">deflateCopy</a> duplicates the internal
697 compression <a href="#state">state</a> which can be quite large, so this strategy is slow and
698 can consume lots of memory.<p>
699
700 <a href="#deflateCopy">deflateCopy</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
701 enough memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source stream <a href="#state">state</a> was inconsistent
702 (such as <a href="#zalloc">zalloc</a> being NULL). <a href="#msg">msg</a> is left unchanged in both source and
703 destination.<p>
704
705<font color="Blue"><dt> int <a name="deflateReset">deflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
706<dd> This function is equivalent to <a href="#deflateEnd">deflateEnd</a> followed by <a href="#deflateInit">deflateInit</a>,
707 but does not free and reallocate all the internal compression <a href="#state">state</a>.
708 The stream will keep the same compression level and any other attributes
709 that may have been set by <a href="#deflateInit2">deflateInit2</a>.<p>
710
711 <a href="#deflateReset">deflateReset</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source
712 stream <a href="#state">state</a> was inconsistent (such as <a href="#zalloc">zalloc</a> or <a href="#state">state</a> being NULL).<p>
713
714<font color="Blue"><dt> int <a name="deflateParams">deflateParams</a> (<a href="#z_streamp">z_streamp</a> strm, int level, int strategy);</font>
715<dd>
716 Dynamically update the compression level and compression strategy. The
717 interpretation of level and strategy is as in <a href="#deflateInit2">deflateInit2</a>. This can be
718 used to switch between compression and straight copy of the input data, or
719 to switch to a different kind of input data requiring a different
720 strategy. If the compression level is changed, the input available so far
721 is compressed with the old level (and may be flushed); the new level will
722 take effect only at the next call of <a href="#deflate">deflate</a>().<p>
723
724 Before the call of <a href="#deflateParams">deflateParams</a>, the stream <a href="#state">state</a> must be set as for
725 a call of <a href="#deflate">deflate</a>(), since the currently available input may have to
726 be compressed and flushed. In particular, strm-&gt <a href="#avail_out">avail_out</a> must be
727 non-zero.<p>
728
729 <a href="#deflateParams">deflateParams</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source
730 stream <a href="#state">state</a> was inconsistent or if a parameter was invalid, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a>
731 if strm-&gtavail_out was zero.<p>
732
733<font color="Blue"><dt> int <a name="inflateInit2">inflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm, int windowBits);</font>
734
735<dd> This is another version of <a href="#inflateInit">inflateInit</a> with an extra parameter. The
736 fields <a href="#next_in">next_in</a>, <a href="#avail_in">avail_in</a>, <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized
737 before by the caller.<p>
738
739 The windowBits parameter is the base two logarithm of the maximum window
740 size (the size of the history buffer). It should be in the range 8..15 for
741 this version of the library. The default value is 15 if <a href="#inflateInit">inflateInit</a> is used
742 instead. If a compressed stream with a larger window size is given as
743 input, <a href="#inflate">inflate</a>() will return with the error code <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> instead of
744 trying to allocate a larger window.<p>
745
746 <a href="#inflateInit2">inflateInit2</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
747 memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a parameter is invalid (such as a negative
748 memLevel). <a href="#msg">msg</a> is set to null if there is no error message. <a href="#inflateInit2">inflateInit2</a>
749 does not perform any decompression apart from reading the zlib header if
750 present: this will be done by <a href="#inflate">inflate</a>(). (So <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a> may be
751 modified, but <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a> are unchanged.)<p>
752
753<font color="Blue"><dt> int <a name="inflateSetDictionary">inflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);</font>
754<dd>
755 Initializes the decompression dictionary from the given uncompressed byte
756 sequence. This function must be called immediately after a call of <a href="#inflate">inflate</a>
757 if this call returned <a href="#Z_NEED_DICT">Z_NEED_DICT</a>. The dictionary chosen by the compressor
758 can be determined from the Adler32 value returned by this call of
759 <a href="#inflate">inflate</a>. The compressor and decompressor must use exactly the same
760 dictionary (see <a href="#deflateSetDictionary">deflateSetDictionary</a>).<p>
761
762 <a href="#inflateSetDictionary">inflateSetDictionary</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a
763 parameter is invalid (such as NULL dictionary) or the stream <a href="#state">state</a> is
764 inconsistent, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the given dictionary doesn't match the
765 expected one (incorrect Adler32 value). <a href="#inflateSetDictionary">inflateSetDictionary</a> does not
766 perform any decompression: this will be done by subsequent calls of
767 <a href="#inflate">inflate</a>().<p>
768
769<font color="Blue"><dt> int <a name="inflateSync">inflateSync</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
770
771<dd> Skips invalid compressed data until a full flush point (see above the
772 description of <a href="#deflate">deflate</a> with <a href="#Z_FULL_FLUSH">Z_FULL_FLUSH</a>) can be found, or until all
773 available input is skipped. No output is provided.<p>
774
775 <a href="#inflateSync">inflateSync</a> returns <a href="#Z_OK">Z_OK</a> if a full flush point has been found, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a>
776 if no more input was provided, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if no flush point has been found,
777 or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream structure was inconsistent. In the success
778 case, the application may save the current current value of <a href="#total_in">total_in</a> which
779 indicates where valid compressed data was found. In the error case, the
780 application may repeatedly call <a href="#inflateSync">inflateSync</a>, providing more input each time,
781 until success or end of the input data.<p>
782
783<font color="Blue"><dt> int <a name="inflateReset">inflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
784<dd>
785 This function is equivalent to <a href="#inflateEnd">inflateEnd</a> followed by <a href="#inflateInit">inflateInit</a>,
786 but does not free and reallocate all the internal decompression <a href="#state">state</a>.
787 The stream will keep attributes that may have been set by <a href="#inflateInit2">inflateInit2</a>.
788 <p>
789
790 <a href="#inflateReset">inflateReset</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source
791 stream <a href="#state">state</a> was inconsistent (such as <a href="#zalloc">zalloc</a> or <a href="#state">state</a> being NULL).
792 <p>
793</dl>
794
795<hr>
796<a name="Checksum functions"><h2> Checksum functions </h2>
797 These functions are not related to compression but are exported
798 anyway because they might be useful in applications using the
799 compression library.
800<h3> Function list </h3>
801<ul>
802<li> uLong <a href="#adler32">adler32</a> (uLong <a href="#adler">adler</a>, const Bytef *buf, uInt len);
803<li> uLong <a href="#crc32">crc32</a> (uLong crc, const Bytef *buf, uInt len);
804</ul>
805<h3> Function description </h3>
806<dl>
807<font color="Blue"><dt> uLong <a name="adler32">adler32</a> (uLong <a href="#adler">adler</a>, const Bytef *buf, uInt len);</font>
808<dd>
809 Update a running Adler-32 checksum with the bytes buf[0..len-1] and
810 return the updated checksum. If buf is NULL, this function returns
811 the required initial value for the checksum.
812 <p>
813 An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
814 much faster. Usage example:
815 <pre>
816
817 uLong <a href="#adler">adler</a> = <a href="#adler32">adler32</a>(0L, <a href="#Z_NULL">Z_NULL</a>, 0);
818
819 while (read_buffer(buffer, length) != EOF) {
820 <a href="#adler">adler</a> = <a href="#adler32">adler32</a>(<a href="#adler">adler</a>, buffer, length);
821 }
822 if (<a href="#adler">adler</a> != original_adler) error();
823 </pre>
824
825<font color="Blue"><dt> uLong <a name="crc32">crc32</a> (uLong crc, const Bytef *buf, uInt len);</font>
826<dd>
827 Update a running crc with the bytes buf[0..len-1] and return the updated
828 crc. If buf is NULL, this function returns the required initial value
829 for the crc. Pre- and post-conditioning (one's complement) is performed
830 within this function so it shouldn't be done by the application.
831 Usage example:
832 <pre>
833
834 uLong crc = <a href="#crc32">crc32</a>(0L, <a href="#Z_NULL">Z_NULL</a>, 0);
835
836 while (read_buffer(buffer, length) != EOF) {
837 crc = <a href="#crc32">crc32</a>(crc, buffer, length);
838 }
839 if (crc != original_crc) error();
840 </pre>
841</dl>
842<hr>
843<a name="struct z_stream_s"><h2> struct z_stream_s </h2>
844<font color="Blue">
845<a name="z_stream_s">
846<pre>
847typedef struct z_stream_s {
848 Bytef *<a name="next_in">next_in</a>; /* next input byte */
849 uInt <a name="avail_in">avail_in</a>; /* number of bytes available at <a href="#next_in">next_in</a> */
850 uLong <a name="total_in">total_in</a>; /* total nb of input bytes read so far */
851
852 Bytef *<a name="next_out">next_out</a>; /* next output byte should be put there */
853 uInt <a name="avail_out">avail_out</a>; /* remaining free space at <a href="#next_out">next_out</a> */
854 uLong <a name="total_out">total_out</a>; /* total nb of bytes output so far */
855
856 char *<a name="msg">msg</a>; /* last error message, NULL if no error */
857 struct internal_state FAR *<a name="state">state</a>; /* not visible by applications */
858
859 alloc_func <a name="zalloc">zalloc</a>; /* used to allocate the internal <a href="#state">state</a> */
860 free_func <a name="zfree">zfree</a>; /* used to free the internal <a href="#state">state</a> */
861 voidpf <a name="opaque">opaque</a>; /* private data object passed to <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> */
862
863 int <a name="data_type">data_type</a>; /* best guess about the data type: ascii or binary */
864 uLong <a name="adler">adler</a>; /* <a href="#adler32">adler32</a> value of the uncompressed data */
865 uLong <a name="reserved">reserved</a>; /* <a href="#reserved">reserved</a> for future use */
866} <a href="#z_stream_s">z_stream</a> ;
867
868typedef <a href="#z_stream_s">z_stream</a> FAR * <a name="z_streamp">z_streamp</a>; ÿ
869</pre>
870</font>
871 The application must update <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a> when <a href="#avail_in">avail_in</a> has
872 dropped to zero. It must update <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a> when <a href="#avail_out">avail_out</a>
873 has dropped to zero. The application must initialize <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and
874 <a href="#opaque">opaque</a> before calling the init function. All other fields are set by the
875 compression library and must not be updated by the application. <p>
876
877 The <a href="#opaque">opaque</a> value provided by the application will be passed as the first
878 parameter for calls of <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a>. This can be useful for custom
879 memory management. The compression library attaches no meaning to the
880 <a href="#opaque">opaque</a> value. <p>
881
882 <a href="#zalloc">zalloc</a> must return <a href="#Z_NULL">Z_NULL</a> if there is not enough memory for the object.
883 If zlib is used in a multi-threaded application, <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> must be
884 thread safe. <p>
885
886 On 16-bit systems, the functions <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> must be able to allocate
887 exactly 65536 bytes, but will not be required to allocate more than this
888 if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
889 pointers returned by <a href="#zalloc">zalloc</a> for objects of exactly 65536 bytes *must*
890 have their offset normalized to zero. The default allocation function
891 provided by this library ensures this (see zutil.c). To reduce memory
892 requirements and avoid any allocation of 64K objects, at the expense of
893 compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
894 <p>
895
896 The fields <a href="#total_in">total_in</a> and <a href="#total_out">total_out</a> can be used for statistics or
897 progress reports. After compression, <a href="#total_in">total_in</a> holds the total size of
898 the uncompressed data and may be saved for use in the decompressor
899 (particularly if the decompressor wants to decompress everything in
900 a single step). <p>
901
902<hr>
903<a name="Constants"><h2> Constants </h2>
904<font color="Blue">
905<pre>
906#define <a name="Z_NO_FLUSH">Z_NO_FLUSH</a> 0
907#define <a name="Z_PARTIAL_FLUSH">Z_PARTIAL_FLUSH</a> 1
908 /* will be removed, use <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a> instead */
909#define <a name="Z_SYNC_FLUSH">Z_SYNC_FLUSH</a> 2
910#define <a name="Z_FULL_FLUSH">Z_FULL_FLUSH</a> 3
911#define <a name="Z_FINISH">Z_FINISH</a> 4
912/* Allowed flush values ; see <a href="#deflate">deflate</a>() below for details */
913
914#define <a name="Z_OK">Z_OK</a> 0
915#define <a name="Z_STREAM_END">Z_STREAM_END</a> 1
916#define <a name="Z_NEED_DICT">Z_NEED_DICT</a> 2
917#define <a name="Z_ERRNO">Z_ERRNO</a> (-1)
918#define <a name="Z_STREAM_ERROR">Z_STREAM_ERROR</a> (-2)
919#define <a name="Z_DATA_ERROR">Z_DATA_ERROR</a> (-3)
920#define <a name="Z_MEM_ERROR">Z_MEM_ERROR</a> (-4)
921#define <a name="Z_BUF_ERROR">Z_BUF_ERROR</a> (-5)
922#define <a name="Z_VERSION_ERROR">Z_VERSION_ERROR</a> (-6)
923/* Return codes for the compression/decompression functions. Negative
924 * values are errors, positive values are used for special but normal events.
925 */
926
927#define <a name="Z_NO_COMPRESSION">Z_NO_COMPRESSION</a> 0
928#define <a name="Z_BEST_SPEED">Z_BEST_SPEED</a> 1
929#define <a name="Z_BEST_COMPRESSION">Z_BEST_COMPRESSION</a> 9
930#define <a name="Z_DEFAULT_COMPRESSION">Z_DEFAULT_COMPRESSION</a> (-1)
931/* compression levels */
932
933#define <a name="Z_FILTERED">Z_FILTERED</a> 1
934#define <a name="Z_HUFFMAN_ONLY">Z_HUFFMAN_ONLY</a> 2
935#define <a name="Z_DEFAULT_STRATEGY">Z_DEFAULT_STRATEGY</a> 0
936/* compression strategy ; see <a href="#deflateInit2">deflateInit2</a>() below for details */
937
938#define <a name="Z_BINARY">Z_BINARY</a> 0
939#define <a name="Z_ASCII">Z_ASCII</a> 1
940#define <a name="Z_UNKNOWN">Z_UNKNOWN</a> 2
941/* Possible values of the <a href="#data_type">data_type</a> field */
942
943#define <a name="Z_DEFLATED">Z_DEFLATED</a> 8
944/* The <a href="#deflate">deflate</a> compression method (the only one supported in this version) */
945
946#define <a name="Z_NULL">Z_NULL</a> 0 /* for initializing <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a>, <a href="#opaque">opaque</a> */
947
948#define <a name="zlib_version">zlib_version</a> <a href="#zlibVersion">zlibVersion</a>()
949/* for compatibility with versions less than 1.0.2 */
950</pre>
951</font>
952
953<hr>
954<a name="Misc"><h2> Misc </h2>
955 <a href="#deflateInit">deflateInit</a> and <a href="#inflateInit">inflateInit</a> are macros to allow checking the zlib version
956 and the compiler's view of <a href="#z_stream_s">z_stream</a>.
957 <p>
958 Other functions:
959 <dl>
960 <font color="Blue"><dt> const char * <a name="zError">zError</a> (int err);</font>
961 <font color="Blue"><dt> int <a name="inflateSyncPoint">inflateSyncPoint</a> (<a href="#z_streamp">z_streamp</a> z);</font>
962 <font color="Blue"><dt> const uLongf * <a name="get_crc_table">get_crc_table</a> (void);</font>
963 </dl>
964 <hr>
965 <font size="-1">
966 Last update: Wed Oct 13 20:42:34 1999<br>
967 piapi@csie.ntu.edu.tw
968 </font>
969
970</body>
971</html>
diff --git a/zutil.c b/zutil.c
index b3de4e8..dfc38ec 100644
--- a/zutil.c
+++ b/zutil.c
@@ -1,5 +1,5 @@
1/* zutil.c -- target dependent utility functions for the compression library 1/* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
diff --git a/zutil.h b/zutil.h
index 6f2cb97..718ebc1 100644
--- a/zutil.h
+++ b/zutil.h
@@ -1,5 +1,5 @@
1/* zutil.h -- internal interface and configuration of the compression library 1/* zutil.h -- internal interface and configuration of the compression library
2 * Copyright (C) 1995-1998 Jean-loup Gailly. 2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
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