| zlib 1.0 is a general purpose data compression library. |
| All the code is reentrant (thread safe). |
| |
| The data format used by the zlib library is described in the |
| files zlib-3.2.doc, deflate-1.2.doc and gzip-4.2.doc, available |
| in ftp://ftp.uu.net/pub/archiving/zip/doc |
| |
| All functions of the compression library are documented in the file |
| zlib.h. A usage example of the library is given in the file example.c |
| which also tests that the library is working correctly. Another |
| example is given in the file minigzip.c. |
| |
| To compile all files and run the test program, just type: make test |
| (For MSDOS, use one of the special makefiles such as Makefile.msc; |
| for VMS, use Make_vms.com or descrip.mms.) |
| To install the zlib library (libz.a) in /usr/local/lib, type: make install |
| To install in a different directory, use for example: |
| make install prefix=$HOME |
| This will install in $HOME/lib instead of /usr/local/lib. |
| |
| Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov>. |
| |
| The changes made in version 1.0 are documented in the file ChangeLog. |
| The main changes since 0.95 are: |
| - allow compression level 0 (no compression) |
| - add deflateParams in zlib.h: allow dynamic change of compression level |
| and compression strategy. |
| - test large buffers and deflateParams in example.c |
| - declare Z_DEFLATED in zlib.h (possible parameter for deflateInit2) |
| - fixes for 64-bit systems (needed for Alpha and Cray) |
| - always return Z_BUF_ERROR when deflate() has nothing to do |
| - fix some very unlikely race conditions. |
| - several minor fixes for better portability |
| - free in reverse order of allocation to help memory manager |
| |
| Notes for some targets: |
| |
| - For MSDOS, the small and medium models have been tested only with |
| Microsoft C. (This should work for Borland C also, but I don't have |
| a Borland compiler to test with.) The small model was tested with |
| Turbo C but only with reduced performance to avoid any far |
| allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3 |
| |
| MS Visual C++1.5 in far model gives: |
| warning C4746: 'z_errmsg' : unsized array treated as '__far' |
| warning C4746: 'inflate_mask' : unsized array treated as '__far' |
| Ignore those warnings. |
| |
| - For 64-bit Iris, deflate.c must be compiled without any optimization. |
| With -O, one libpng test fails. The test works in 32 bit mode (with the |
| -32 compiler flag). |
| |
| |
| Copyright notice: |
| |
| (C) 1995-1996 Jean-loup Gailly and Mark Adler |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| |
| Jean-loup Gailly Mark Adler |
| gzip@prep.ai.mit.edu madler@alumni.caltech.edu |
| |
| If you use the zlib library in a product, we would appreciate *not* |
| receiving lengthy legal documents to sign. The sources are provided |
| for free but without warranty of any kind. The library has been |
| entirely written by Jean-loup Gailly and Mark Adler; it does not |
| include third-party code. |
| |
| If you redistribute modified sources, we would appreciate that you include |
| in the file ChangeLog history information documenting your changes. |
