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Václav Slavík
2004-11-05 15:46:58 +00:00
parent 7e961abe12
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88
src/zlib/FAQ
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@@ -21,18 +21,18 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
3. Where can I get a Visual Basic interface to zlib? 3. Where can I get a Visual Basic interface to zlib?
See See
* http://www.winimage.com/zLibDll/
* http://www.dogma.net/markn/articles/zlibtool/zlibtool.htm * http://www.dogma.net/markn/articles/zlibtool/zlibtool.htm
* contrib/visual-basic.txt in the zlib distribution * contrib/visual-basic.txt in the zlib distribution
* win32/DLL_FAQ.txt in the zlib distribution
4. compress() returns Z_BUF_ERROR 4. compress() returns Z_BUF_ERROR.
Make sure that before the call of compress, the length of the compressed Make sure that before the call of compress, the length of the compressed
buffer is equal to the total size of the compressed buffer and not buffer is equal to the total size of the compressed buffer and not
zero. For Visual Basic, check that this parameter is passed by reference zero. For Visual Basic, check that this parameter is passed by reference
("as any"), not by value ("as long"). ("as any"), not by value ("as long").
5. deflate() or inflate() returns Z_BUF_ERROR 5. deflate() or inflate() returns Z_BUF_ERROR.
Before making the call, make sure that avail_in and avail_out are not Before making the call, make sure that avail_in and avail_out are not
zero. When setting the parameter flush equal to Z_FINISH, also make sure zero. When setting the parameter flush equal to Z_FINISH, also make sure
@@ -47,8 +47,8 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
It's in zlib.h for the moment, and Francis S. Lin has converted it to a It's in zlib.h for the moment, and Francis S. Lin has converted it to a
web page zlib.html. Volunteers to transform this to Unix-style man pages, web page zlib.html. Volunteers to transform this to Unix-style man pages,
please contact Jean-loup Gailly (jloup@gzip.org). Examples of zlib usage please contact us (zlib@gzip.org). Examples of zlib usage are in the files
are in the files example.c and minigzip.c. example.c and minigzip.c.
7. Why don't you use GNU autoconf or libtool or ...? 7. Why don't you use GNU autoconf or libtool or ...?
@@ -77,7 +77,8 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
11. Can zlib handle .zip archives? 11. Can zlib handle .zip archives?
See the directory contrib/minizip in the zlib distribution. Not by itself, no. See the directory contrib/minizip in the zlib
distribution.
12. Can zlib handle .Z files? 12. Can zlib handle .Z files?
@@ -92,6 +93,8 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
14. How do I install a shared zlib library on Unix? 14. How do I install a shared zlib library on Unix?
After the above, then:
make install make install
However, many flavors of Unix come with a shared zlib already installed. However, many flavors of Unix come with a shared zlib already installed.
@@ -99,12 +102,31 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
trying to install it, you may want to check if it's already there! If you trying to install it, you may want to check if it's already there! If you
can #include <zlib.h>, it's there. The -lz option will probably link to it. can #include <zlib.h>, it's there. The -lz option will probably link to it.
15. I have a question about OttoPDF 15. I have a question about OttoPDF.
We are not the authors of OttoPDF. The real author is on the OttoPDF web We are not the authors of OttoPDF. The real author is on the OttoPDF web
site Joel Hainley jhainley@myndkryme.com. site: Joel Hainley, jhainley@myndkryme.com.
16. Why does gzip give an error on a file I make with compress/deflate? 16. Can zlib decode Flate data in an Adobe PDF file?
Yes. See http://www.fastio.com/ (ClibPDF), or http://www.pdflib.com/ .
To modify PDF forms, see http://sourceforge.net/projects/acroformtool/ .
17. Why am I getting this "register_frame_info not found" error on Solaris?
After installing zlib 1.1.4 on Solaris 2.6, running applications using zlib
generates an error such as:
ld.so.1: rpm: fatal: relocation error: file /usr/local/lib/libz.so:
symbol __register_frame_info: referenced symbol not found
The symbol __register_frame_info is not part of zlib, it is generated by
the C compiler (cc or gcc). You must recompile applications using zlib
which have this problem. This problem is specific to Solaris. See
http://www.sunfreeware.com for Solaris versions of zlib and applications
using zlib.
18. Why does gzip give an error on a file I make with compress/deflate?
The compress and deflate functions produce data in the zlib format, which The compress and deflate functions produce data in the zlib format, which
is different and incompatible with the gzip format. The gz* functions in is different and incompatible with the gzip format. The gz* functions in
@@ -112,7 +134,7 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
formats use the same compressed data format internally, but have different formats use the same compressed data format internally, but have different
headers and trailers around the compressed data. headers and trailers around the compressed data.
17. Ok, so why are there two different formats? 19. Ok, so why are there two different formats?
The gzip format was designed to retain the directory information about The gzip format was designed to retain the directory information about
a single file, such as the name and last modification date. The zlib a single file, such as the name and last modification date. The zlib
@@ -120,7 +142,7 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
channel applications, and has a much more compact header and trailer and channel applications, and has a much more compact header and trailer and
uses a faster integrity check than gzip. uses a faster integrity check than gzip.
18. Well that's nice, but how do I make a gzip file in memory? 20. Well that's nice, but how do I make a gzip file in memory?
You can request that deflate write the gzip format instead of the zlib You can request that deflate write the gzip format instead of the zlib
format using deflateInit2(). You can also request that inflate decode format using deflateInit2(). You can also request that inflate decode
@@ -133,7 +155,7 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
function and roll your own gzip encoding and decoding. Read the gzip function and roll your own gzip encoding and decoding. Read the gzip
RFC 1952 for details of the header and trailer format. RFC 1952 for details of the header and trailer format.
19. Is zlib thread-safe? 21. Is zlib thread-safe?
Yes. However any library routines that zlib uses and any application- Yes. However any library routines that zlib uses and any application-
provided memory allocation routines must also be thread-safe. zlib's gz* provided memory allocation routines must also be thread-safe. zlib's gz*
@@ -144,15 +166,15 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
Of course, you should only operate on any given zlib or gzip stream from a Of course, you should only operate on any given zlib or gzip stream from a
single thread at a time. single thread at a time.
20. Can I use zlib in my commercial application? 22. Can I use zlib in my commercial application?
Yes. Please read the license in zlib.h. Yes. Please read the license in zlib.h.
21. Is zlib under the GNU license? 23. Is zlib under the GNU license?
No. Please read the license in zlib.h. No. Please read the license in zlib.h.
22. The license says that altered source versions must be "plainly marked". So 24. The license says that altered source versions must be "plainly marked". So
what exactly do I need to do to meet that requirement? what exactly do I need to do to meet that requirement?
You need to change the ZLIB_VERSION and ZLIB_VERNUM #defines in zlib.h. In You need to change the ZLIB_VERSION and ZLIB_VERNUM #defines in zlib.h. In
@@ -175,24 +197,24 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
ZLIB_VERSION and ZLIB_VERNUM and note the origin and nature of the changes ZLIB_VERSION and ZLIB_VERNUM and note the origin and nature of the changes
in zlib.h as you would for a full source distribution. in zlib.h as you would for a full source distribution.
23. Will zlib work on a big-endian or little-endian architecture, and can I 25. Will zlib work on a big-endian or little-endian architecture, and can I
exchange compressed data between them? exchange compressed data between them?
Yes and yes. Yes and yes.
24. Will zlib work on a 64-bit machine? 26. Will zlib work on a 64-bit machine?
It should. It has been tested on 64-bit machines, and has no dependence It should. It has been tested on 64-bit machines, and has no dependence
on any data types being limited to 32-bits in length. If you have any on any data types being limited to 32-bits in length. If you have any
difficulties, please provide a complete problem report to zlib@gzip.org difficulties, please provide a complete problem report to zlib@gzip.org
25. Will zlib decompress data from the PKWare Data Compression Library? 27. Will zlib decompress data from the PKWare Data Compression Library?
No. The PKWare DCL uses a completely different compressed data format No. The PKWare DCL uses a completely different compressed data format
than does PKZIP and zlib. However, you can look in zlib's contrib/blast than does PKZIP and zlib. However, you can look in zlib's contrib/blast
directory for a possible solution to your problem. directory for a possible solution to your problem.
26. Can I access data randomly in a compressed stream? 28. Can I access data randomly in a compressed stream?
No, not without some preparation. If when compressing you periodically No, not without some preparation. If when compressing you periodically
use Z_FULL_FLUSH, carefully write all the pending data at those points, use Z_FULL_FLUSH, carefully write all the pending data at those points,
@@ -200,27 +222,27 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
at those points. You have to be careful to not use Z_FULL_FLUSH too at those points. You have to be careful to not use Z_FULL_FLUSH too
often, since it can significantly degrade compression. often, since it can significantly degrade compression.
27. Does zlib work on MVS, OS/390, CICS, etc.? 29. Does zlib work on MVS, OS/390, CICS, etc.?
We don't know for sure. We have heard occasional reports of success on We don't know for sure. We have heard occasional reports of success on
these systems. If you do use it on one of these, please provide us with these systems. If you do use it on one of these, please provide us with
a report, instructions, and patches that we can reference when we get a report, instructions, and patches that we can reference when we get
these questions. Thanks. these questions. Thanks.
28. Is there some simpler, easier to read version of inflate I can look at 30. Is there some simpler, easier to read version of inflate I can look at
to understand the deflate format? to understand the deflate format?
First off, you should read RFC 1951. Second, yes. Look in zlib's First off, you should read RFC 1951. Second, yes. Look in zlib's
contrib/puff directory. contrib/puff directory.
29. Does zlib infringe on any patents? 31. Does zlib infringe on any patents?
As far as we know, no. In fact, that was originally the whole point behind As far as we know, no. In fact, that was originally the whole point behind
zlib. Look here for some more information: zlib. Look here for some more information:
http://www.gzip.org/#faq11 http://www.gzip.org/#faq11
30. Can zlib work with greater than 4 GB of data? 32. Can zlib work with greater than 4 GB of data?
Yes. inflate() and deflate() will process any amount of data correctly. Yes. inflate() and deflate() will process any amount of data correctly.
Each call of inflate() or deflate() is limited to input and output chunks Each call of inflate() or deflate() is limited to input and output chunks
@@ -238,7 +260,7 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
only if the compiler's "long" type is 32 bits. If the compiler's "long" only if the compiler's "long" type is 32 bits. If the compiler's "long"
type is 64 bits, then the limit is 16 exabytes. type is 64 bits, then the limit is 16 exabytes.
31. Does zlib have any security vulnerabilities? 33. Does zlib have any security vulnerabilities?
The only one that we are aware of is potentially in gzprintf(). If zlib The only one that we are aware of is potentially in gzprintf(). If zlib
is compiled to use sprintf() or vsprintf(), then there is no protection is compiled to use sprintf() or vsprintf(), then there is no protection
@@ -258,35 +280,35 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
Note that you should be using the most recent version of zlib. Versions Note that you should be using the most recent version of zlib. Versions
1.1.3 and before were subject to a double-free vulnerability. 1.1.3 and before were subject to a double-free vulnerability.
32. Is there a Java version of zlib? 34. Is there a Java version of zlib?
Probably what you want is to use zlib in Java. zlib is already included Probably what you want is to use zlib in Java. zlib is already included
as part of the Java SDK in the java.util.zip package. If you really want as part of the Java SDK in the java.util.zip package. If you really want
a version of zlib written in the Java language, look on the zlib home a version of zlib written in the Java language, look on the zlib home
page for links: http://www.zlib.org/ page for links: http://www.zlib.org/
33. I get this or that compiler or source-code scanner warning when I crank it 35. I get this or that compiler or source-code scanner warning when I crank it
up to maximally-pendantic. Can't you guys write proper code? up to maximally-pedantic. Can't you guys write proper code?
Many years ago, we gave up attempting to avoid warnings on every compiler Many years ago, we gave up attempting to avoid warnings on every compiler
in the universe. It just got to be a waste of time, and some compilers in the universe. It just got to be a waste of time, and some compilers
were downright silly. So now, we simply make sure that the code always were downright silly. So now, we simply make sure that the code always
works. works.
34. Will zlib read the (insert any ancient or arcane format here) compressed 36. Will zlib read the (insert any ancient or arcane format here) compressed
data format? data format?
Probably not. Look in the comp.compression FAQ for pointers to various Probably not. Look in the comp.compression FAQ for pointers to various
formats and associated software. formats and associated software.
35. How can I encrypt/decrypt zip files with zlib? 37. How can I encrypt/decrypt zip files with zlib?
zlib doesn't support encryption. The original PKZIP encryption is very weak zlib doesn't support encryption. The original PKZIP encryption is very weak
and can be broken with freely available programs. To get strong encryption, and can be broken with freely available programs. To get strong encryption,
use gpg ( http://www.gnupg.org/ ) which already includes zlib compression. use GnuPG, http://www.gnupg.org/ , which already includes zlib compression.
For PKZIP compatible "encryption", look at http://www.info-zip.org/ For PKZIP compatible "encryption", look at http://www.info-zip.org/
36. What's the difference between the "gzip" and "deflate" HTTP 1.1 encodings? 38. What's the difference between the "gzip" and "deflate" HTTP 1.1 encodings?
"gzip" is the gzip format, and "deflate" is the zlib format. They should "gzip" is the gzip format, and "deflate" is the zlib format. They should
probably have called the second one "zlib" instead to avoid confusion probably have called the second one "zlib" instead to avoid confusion
@@ -302,14 +324,14 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
Bottom line: use the gzip format for HTTP 1.1 encoding. Bottom line: use the gzip format for HTTP 1.1 encoding.
37. Does zlib support the new "Deflate64" format introduced by PKWare? 39. Does zlib support the new "Deflate64" format introduced by PKWare?
No. PKWare has apparently decided to keep that format proprietary, since No. PKWare has apparently decided to keep that format proprietary, since
they have not documented it as they have previous compression formats. they have not documented it as they have previous compression formats.
In any case, the compression improvements are so modest compared to other In any case, the compression improvements are so modest compared to other
more modern approaches, that it's not worth the effort to implement. more modern approaches, that it's not worth the effort to implement.
38. Can you please sign these lengthy legal documents and fax them back to us 40. Can you please sign these lengthy legal documents and fax them back to us
so that we can use your software in our product? so that we can use your software in our product?
No. Go away. Shoo. No. Go away. Shoo.

3
src/zlib/INDEX
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@@ -8,9 +8,12 @@ algorithm.txt description of the (de)compression algorithm
configure configure script for Unix configure configure script for Unix
zconf.in.h template for zconf.h (used by configure) zconf.in.h template for zconf.h (used by configure)
amiga/ makefiles for Amiga SAS C
as400/ makefiles for IBM AS/400
msdos/ makefiles for MSDOS msdos/ makefiles for MSDOS
old/ makefiles for various architectures and zlib documentation old/ makefiles for various architectures and zlib documentation
files that have not yet been updated for zlib 1.2.x files that have not yet been updated for zlib 1.2.x
projects/ projects for various Integrated Development Environments
qnx/ makefiles for QNX qnx/ makefiles for QNX
win32/ makefiles for Windows win32/ makefiles for Windows

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src/zlib/README
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@@ -1,6 +1,6 @@
ZLIB DATA COMPRESSION LIBRARY ZLIB DATA COMPRESSION LIBRARY
zlib 1.2.1 is a general purpose data compression library. All the code is zlib 1.2.2 is a general purpose data compression library. All the code is
thread safe. The data format used by the zlib library is described by RFCs thread safe. The data format used by the zlib library is described by RFCs
(Request for Comments) 1950 to 1952 in the files (Request for Comments) 1950 to 1952 in the files
http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format) http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
@@ -34,7 +34,7 @@ Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
issue of Dr. Dobb's Journal; a copy of the article is available in issue of Dr. Dobb's Journal; a copy of the article is available in
http://dogma.net/markn/articles/zlibtool/zlibtool.htm http://dogma.net/markn/articles/zlibtool/zlibtool.htm
The changes made in version 1.2.1 are documented in the file ChangeLog. The changes made in version 1.2.2 are documented in the file ChangeLog.
Unsupported third party contributions are provided in directory "contrib". Unsupported third party contributions are provided in directory "contrib".
@@ -46,7 +46,7 @@ A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is in the
CPAN (Comprehensive Perl Archive Network) sites CPAN (Comprehensive Perl Archive Network) sites
http://www.cpan.org/modules/by-module/Compress/ http://www.cpan.org/modules/by-module/Compress/
A Python interface to zlib written by A.M. Kuchling <amk@magnet.com> is A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
available in Python 1.5 and later versions, see available in Python 1.5 and later versions, see
http://www.python.org/doc/lib/module-zlib.html http://www.python.org/doc/lib/module-zlib.html
@@ -93,7 +93,7 @@ Acknowledgments:
Copyright notice: Copyright notice:
(C) 1995-2003 Jean-loup Gailly and Mark Adler (C) 1995-2004 Jean-loup Gailly and Mark Adler
This software is provided 'as-is', without any express or implied This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages warranty. In no event will the authors be held liable for any damages