README 5.2 KB

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  1. This directory contains the zlib package, which is not part of GCC but
  2. shipped with GCC as convenience.
  3. ZLIB DATA COMPRESSION LIBRARY
  4. zlib 1.2.11 is a general purpose data compression library. All the code is
  5. thread safe. The data format used by the zlib library is described by RFCs
  6. (Request for Comments) 1950 to 1952 in the files
  7. http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
  8. rfc1952 (gzip format).
  9. All functions of the compression library are documented in the file zlib.h
  10. (volunteer to write man pages welcome, contact zlib@gzip.org). A usage example
  11. of the library is given in the file test/example.c which also tests that
  12. the library is working correctly. Another example is given in the file
  13. test/minigzip.c. The compression library itself is composed of all source
  14. files in the root directory.
  15. To compile all files and run the test program, follow the instructions given at
  16. the top of Makefile.in. In short "./configure; make test", and if that goes
  17. well, "make install" should work for most flavors of Unix. For Windows, use
  18. one of the special makefiles in win32/ or contrib/vstudio/ . For VMS, use
  19. make_vms.com.
  20. Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
  21. <info@winimage.com> for the Windows DLL version. The zlib home page is
  22. http://zlib.net/ . Before reporting a problem, please check this site to
  23. verify that you have the latest version of zlib; otherwise get the latest
  24. version and check whether the problem still exists or not.
  25. PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
  26. Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
  27. issue of Dr. Dobb's Journal; a copy of the article is available at
  28. http://marknelson.us/1997/01/01/zlib-engine/ .
  29. The changes made in version 1.2.11 are documented in the file ChangeLog.
  30. Unsupported third party contributions are provided in directory contrib/ .
  31. zlib is available in Java using the java.util.zip package, documented at
  32. http://java.sun.com/developer/technicalArticles/Programming/compression/ .
  33. A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
  34. at CPAN (Comprehensive Perl Archive Network) sites, including
  35. http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
  36. A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
  37. available in Python 1.5 and later versions, see
  38. http://docs.python.org/library/zlib.html .
  39. zlib is built into tcl: http://wiki.tcl.tk/4610 .
  40. An experimental package to read and write files in .zip format, written on top
  41. of zlib by Gilles Vollant <info@winimage.com>, is available in the
  42. contrib/minizip directory of zlib.
  43. Notes for some targets:
  44. - For Windows DLL versions, please see win32/DLL_FAQ.txt
  45. - For 64-bit Irix, deflate.c must be compiled without any optimization. With
  46. -O, one libpng test fails. The test works in 32 bit mode (with the -n32
  47. compiler flag). The compiler bug has been reported to SGI.
  48. - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
  49. when compiled with cc.
  50. - On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
  51. necessary to get gzprintf working correctly. This is done by configure.
  52. - zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
  53. other compilers. Use "make test" to check your compiler.
  54. - gzdopen is not supported on RISCOS or BEOS.
  55. - For PalmOs, see http://palmzlib.sourceforge.net/
  56. Acknowledgments:
  57. The deflate format used by zlib was defined by Phil Katz. The deflate and
  58. zlib specifications were written by L. Peter Deutsch. Thanks to all the
  59. people who reported problems and suggested various improvements in zlib; they
  60. are too numerous to cite here.
  61. Copyright notice:
  62. (C) 1995-2017 Jean-loup Gailly and Mark Adler
  63. This software is provided 'as-is', without any express or implied
  64. warranty. In no event will the authors be held liable for any damages
  65. arising from the use of this software.
  66. Permission is granted to anyone to use this software for any purpose,
  67. including commercial applications, and to alter it and redistribute it
  68. freely, subject to the following restrictions:
  69. 1. The origin of this software must not be misrepresented; you must not
  70. claim that you wrote the original software. If you use this software
  71. in a product, an acknowledgment in the product documentation would be
  72. appreciated but is not required.
  73. 2. Altered source versions must be plainly marked as such, and must not be
  74. misrepresented as being the original software.
  75. 3. This notice may not be removed or altered from any source distribution.
  76. Jean-loup Gailly Mark Adler
  77. jloup@gzip.org madler@alumni.caltech.edu
  78. If you use the zlib library in a product, we would appreciate *not* receiving
  79. lengthy legal documents to sign. The sources are provided for free but without
  80. warranty of any kind. The library has been entirely written by Jean-loup
  81. Gailly and Mark Adler; it does not include third-party code.
  82. If you redistribute modified sources, we would appreciate that you include in
  83. the file ChangeLog history information documenting your changes. Please read
  84. the FAQ for more information on the distribution of modified source versions.