| Name: zlib |
| URL: http://zlib.net/ |
| Version: 1.2.8 |
| Security Critical: yes |
| License: Custom license |
| License Android Compatible: yes |
| |
| Description: |
| General purpose compression library |
| |
| Local Modifications: |
| A few minor changes, all marked with "Google": |
| - Added #ifdefs to avoid compile warnings when NO_GZCOMPRESS is defined. |
| - Removed use of strerror for WinCE in gzio.c. |
| - Added 'int z_errno' global for WinCE, to which 'errno' is defined in zutil.h. |
| - Added 'mozzconf.h' to mangle the function names. |
| - Added logic in zlib.h to undef our earlier mangles when defaulting to 64 bit offset versions of API. |
| - Added casts to suppress VC++ warnings |
| The 'google.patch' file represents our changes from the original zlib-1.2.5. |
| |
| Integrated Intel SIMD optimisations from: https://github.com/jtkukunas/zlib/ |
| and modified to accomodate the older version and existing changes in tree. |
| |
| This introduces new files: simd_stub.c, crc_folding.c, fill_window_sse.c and |
| x86.[ch]. All but the latter are built into a static library to allow the |
| compiler to use the desired instructions only when valid. The latter version is |
| only built on x86 (32-bit and 64-bit) systems with it's functionality stubbed |
| on the others. |
| |
| Other changes to accomodate: |
| - fill_window() implementation calls into _sse() variant when supported and the |
| original implementation renamed to _c() |
| - read_buf was moved from local to ZLIB_INTERNAL for fill_window_sse.c to use |
| - INSERT_STRING macro was made a function, insert_string() and an implementation using CRC instruction added |
| - some crc funcionality moved into crc32.c |
| |
| Update to zlib-1.2.8, generate a third patch which includes the jtkukunas optimisations. We may merge some more from jtkukunas branch later. |
| Currently we upgrade to madler's version 1.2.8,merged SIMD optimisation and |
| some other changes above. |
| The step as follows: |
| 1.download a clean madler zlib from github. |
| 2.apply google.patch, simd.patch sequencely. |
| 3.update these patches. |
