third_party/zlib/README.chromium - Issue 2023703002: Beginning work on GN build

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Issue 2023703002: Beginning work on GN build (Closed) Base URL: git@github.com:dart-lang/sdk.git@master

Patch Set: Really add //build. Add dart_bootstrap rule. Created 4 years, 6 months ago

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	1 Name: zlib

	2 URL: http://zlib.net/

	3 Version: 1.2.5

	4 Security Critical: yes

	5 License: Custom license

	6 License Android Compatible: yes

	7

	8 Description:

	9 General purpose compression library

	10

	11 Local Modifications:

	12 A few minor changes, all marked with "Google":

	13 - Added #ifdefs to avoid compile warnings when NO_GZCOMPRESS is defined.

	14 - Removed use of strerror for WinCE in gzio.c.

	15 - Added 'int z_errno' global for WinCE, to which 'errno' is defined in zutil.h.

	16 - Added 'mozzconf.h' to mangle the function names.

	17 - Added logic in zlib.h to undef our earlier mangles when defaulting to 64 bit o ffset versions of API.

	18 - Added casts to suppress VC++ warnings

	19 The 'google.patch' file represents our changes from the original zlib-1.2.5.

	20

	21 A more significant change to support mixed-source data compression. See

	22 crbug.com/139744 and mixed-source.patch.

	23

	24 Integrated Intel SIMD optimisations from: https://github.com/jtkukunas/zlib/

	25 and modified to accomodate the older version and existing changes in tree.

	26

	27 This introduces new files: simd_stub.c, crc_folding.c, fill_window_sse.c and

	28 x86.[ch]. All but the latter are built into a static library to allow the

	29 compiler to use the desired instructions only when valid. The latter version is

	30 only built on x86 (32-bit and 64-bit) systems with it's functionality stubbed

	31 on the others.

	32

	33 Other changes to accomodate:

	34 - fill_window() implementation calls into _sse() variant when supported and the

	35 original implementation renamed to _c()

	36 - read_buf was moved from local to ZLIB_INTERNAL for fill_window_sse.c to use

	37 - INSERT_STRING macro was made a function, insert_string() and an implementation using CRC instruction added

	38 - some crc funcionality moved into crc32.c

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