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8f667a0d22
Modern compression algorithms are better than zlib both in terms of space and time. The jar format, used for e.g. omni.ja, addons, etc. could benefit from using such modern algorithms, but the format only allows a limited set of compression algorithms. However, the format in itself is flexible, in that it can be extended with arbitrary compression algorithms. This breaks compatibility with programs like unzip, obviously, but we've never promised the files shipped with Firefox will always remain "valid" zips (which they already aren't, but they currently work with most zip readers). With this change, we allow those archives to contain brotli streams, using an arbitrary large value for the compression type in the Zip local file header. This only allows to read such archives, but not to produce them, and, for now, support for brotli streams is kept Nightly-only, until everything is pieced together and we're happy to ship it. --HG-- extra : rebase_source : fa637251f460ad0d91d5f5bec392c6e59555e80d
111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _zipstruct_h
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#define _zipstruct_h
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/*
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* Certain constants and structures for
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* the Phil Katz ZIP archive format.
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*
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*/
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typedef struct ZipLocal_
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{
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unsigned char signature [4];
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unsigned char word [2];
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unsigned char bitflag [2];
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unsigned char method [2];
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unsigned char time [2];
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unsigned char date [2];
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unsigned char crc32 [4];
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unsigned char size [4];
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unsigned char orglen [4];
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unsigned char filename_len [2];
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unsigned char extrafield_len [2];
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} ZipLocal;
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/*
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* 'sizeof(struct XXX)' includes padding on ARM (see bug 87965)
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* As the internals of a jar/zip file must not depend on the target
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* architecture (i386, ppc, ARM, ...), use a fixed value instead.
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*/
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#define ZIPLOCAL_SIZE (4+2+2+2+2+2+4+4+4+2+2)
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typedef struct ZipCentral_
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{
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unsigned char signature [4];
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unsigned char version_made_by [2];
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unsigned char version [2];
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unsigned char bitflag [2];
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unsigned char method [2];
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unsigned char time [2];
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unsigned char date [2];
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unsigned char crc32 [4];
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unsigned char size [4];
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unsigned char orglen [4];
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unsigned char filename_len [2];
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unsigned char extrafield_len [2];
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unsigned char commentfield_len [2];
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unsigned char diskstart_number [2];
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unsigned char internal_attributes [2];
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unsigned char external_attributes [4];
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unsigned char localhdr_offset [4];
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} ZipCentral;
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/*
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* 'sizeof(struct XXX)' includes padding on ARM (see bug 87965)
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* As the internals of a jar/zip file must not depend on the target
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* architecture (i386, ppc, ARM, ...), use a fixed value instead.
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*/
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#define ZIPCENTRAL_SIZE (4+2+2+2+2+2+2+4+4+4+2+2+2+2+2+4+4)
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typedef struct ZipEnd_
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{
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unsigned char signature [4];
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unsigned char disk_nr [2];
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unsigned char start_central_dir [2];
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unsigned char total_entries_disk [2];
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unsigned char total_entries_archive [2];
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unsigned char central_dir_size [4];
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unsigned char offset_central_dir [4];
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unsigned char commentfield_len [2];
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} ZipEnd;
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/*
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* 'sizeof(struct XXX)' includes padding on ARM (see bug 87965)
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* As the internals of a jar/zip file must not depend on the target
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* architecture (i386, ppc, ARM, ...), use a fixed value instead.
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*/
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#define ZIPEND_SIZE (4+2+2+2+2+4+4+2)
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/* signatures */
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#define LOCALSIG 0x04034B50l
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#define CENTRALSIG 0x02014B50l
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#define ENDSIG 0x06054B50l
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/* extra fields */
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#define EXTENDED_TIMESTAMP_FIELD 0x5455
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#define EXTENDED_TIMESTAMP_MODTIME 0x01
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/* compression methods */
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#define STORED 0
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#define SHRUNK 1
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#define REDUCED1 2
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#define REDUCED2 3
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#define REDUCED3 4
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#define REDUCED4 5
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#define IMPLODED 6
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#define TOKENIZED 7
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#define DEFLATED 8
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#define UNSUPPORTED 0xFF
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/* non-standard extension */
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#ifdef NIGHTLY_BUILD
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#define MOZ_JAR_BROTLI 0x81
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#endif
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#endif /* _zipstruct_h */
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