| /external/grpc-grpc/doc/ |
| D | compression_cookbook.md | 1 # gRPC (Core) Compression Cookbook
5 This document describes compression as implemented by the gRPC C core. See [the
6 full compression specification](compression.md) for details.
10 Wrapped languages developers, for the purposes of supporting compression by
15 1. Be able to set compression at [channel](#per-channel-settings),
20 spec](https://github.com/grpc/grpc/blob/master/doc/compression.md#test-cases).
31 still not symmetric between clients and servers (e.g. the [use of compression
32 levels](https://github.com/grpc/grpc/blob/master/doc/compression.md#compression-levels-and-algorith…
47 document](https://github.com/grpc/grpc/blob/master/doc/compression.md#compression-levels-and-algori…
48 compression _levels_ are the primary mechanism for compression selection _at the
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| D | compression.md | 1 ## gRPC Compression
9 Compression is used to reduce the amount of bandwidth used between peers. The
10 compression supported by gRPC acts _at the individual message level_, taking
14 The implementation supports different compression algorithms. A _default
15 compression level_, to be used in the absence of message-specific settings, MAY
18 The ability to control compression settings per call and to enable/disable
19 compression on a per message basis MAY be used to prevent CRIME/BEAST attacks.
20 It also allows for asymmetric compression communication, whereby a response MAY
25 Compression MAY be configured by the Client Application by calling the
26 appropriate API method. There are two scenarios where compression MAY be
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| /external/zstd/programs/ |
| D | zstd.1 | 20 …compression algorithm and data compression tool, with command line syntax similar to \fBgzip (1)\f…
86 Benchmark file(s) using compression level #
99 \fB\-#\fR: \fB#\fR compression level [1\-19] (default: 3)
102 \fB\-\-ultra\fR: unlocks high compression levels 20+ (maximum 22), using a lot more memory\. Note t…
105 …compression levels\. If \fB=#\fR is not present, it defaults to \fB1\fR\. The higher the value, th…
111 …compression, use a single thread for both I/O and compression\. In this mode, compression is seria…
117 …,max=#]\fR : \fBzstd\fR will dynamically adapt compression level to perceived I/O conditions\. Com…
120 … compressor and decompressor\. This setting is designed to improve the compression ratio for files…
129 …ference point for zstd\'s diff engine\. This is effectively dictionary compression with some conve…
132 …ingle\-thread mode to improve compression ratio at the cost of speed Note: for level 19, you can g…
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| D | zstd.1.md | 18 `zstd` is a fast lossless compression algorithm and data compression tool,
21 `zstd` offers highly configurable compression speed,
23 and strong modes nearing lzma compression ratios.
92 Benchmark file(s) using compression level #
104 `#` compression level \[1-19] (default: 3)
106 unlocks high compression levels 20+ (maximum 22), using a lot more memory.
109 switch to ultra-fast compression levels.
111 The higher the value, the faster the compression speed,
112 at the cost of some compression ratio.
113 This setting overwrites compression level if one was set previously.
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| D | README.md | 72 - __ZSTD_NOCOMPRESS__ : `zstd` cli will be compiled without support for compression.
111 which can be loaded before compression and decompression.
113 Using a dictionary, the compression ratio achievable on small data improves dramatically.
114 These compression gains are achieved while simultaneously providing faster compression and decompre…
117 Dictionary gains are mostly effective in the first few KB. Then, the compression algorithm
128 CLI includes in-memory compression benchmark module for zstd.
134 The benchmark measures ratio, compressed size, compression and decompression speed.
135 One can select compression levels starting from `-b` and ending with `-e`.
148 -# : # compression level (1-19, default: 3)
150 -D DICT: use DICT as Dictionary for compression or decompression
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| /external/lzma/DOC/ |
| D | lzma-sdk.txt | 6 use 7z / LZMA / LZMA2 / XZ compression.
8 LZMA is an improved version of famous LZ77 compression algorithm.
9 It was improved in way of maximum increasing of compression ratio,
13 LZMA2 is a LZMA based compression method. LZMA2 provides better
14 multithreading support for compression than LZMA and some other improvements.
16 7z is a file format for data compression and file archiving.
17 7z is a main file format for 7-Zip compression program (www.7-zip.org).
18 7z format supports different compression methods: LZMA, LZMA2 and others.
21 XZ is a file format for data compression that uses LZMA2 compression.
23 improved compression ratio, splitting to blocks and streams,
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| /external/apache-commons-compress/src/main/java/org/apache/commons/compress/archivers/zip/ |
| D | ZipMethod.java | 26 * List of known compression methods
35 * Compression method 0 for uncompressed entries.
45 … href="https://www.pkware.com/documents/casestudies/APPNOTE.TXT">Explanation of fields: compression
51 * Reduced with compression factor 1.
53 … href="https://www.pkware.com/documents/casestudies/APPNOTE.TXT">Explanation of fields: compression
59 * Reduced with compression factor 2.
61 … href="https://www.pkware.com/documents/casestudies/APPNOTE.TXT">Explanation of fields: compression
67 * Reduced with compression factor 3.
69 … href="https://www.pkware.com/documents/casestudies/APPNOTE.TXT">Explanation of fields: compression
75 * Reduced with compression factor 4.
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| /external/lz4/programs/ |
| D | lz4.1 | 20 …ely fast lossless compression algorithm, based on \fBbyte\-aligned LZ77\fR family of compression s…
32 \fBlz4 file\.lz4\fR will default to decompression (use \fB\-z\fR to force compression)
38 \fBlz4\fR shows real\-time notification statistics during compression or decompression of a single …
58 It\'s possible to opt\-in to erase source files on successful compression or decompression, using \…
94 …\fB\-\-decompress\fR by default)\. \fB\-z\fR can also be used to force compression of an already c…
106 Benchmark mode, using \fB#\fR compression level\.
116 Compression level, with # being any value from 1 to 12\. Higher values trade compression speed for …
120 …compression levels\. The higher the value, the faster the compression speed, at the cost of some c…
124 Set highest compression level\. Same as \-12\.
128 …ing on use cases\. This option only works in combination with very high compression levels (>=10)\.
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| D | lz4.1.md | 21 `lz4` is an extremely fast lossless compression algorithm,
22 based on **byte-aligned LZ77** family of compression scheme.
23 `lz4` offers compression speeds > 500 MB/s per core,
36 * `lz4 file.lz4` will default to decompression (use `-z` to force compression)
39 during compression or decompression of a single file
61 on successful compression or decompression, using `--rm` command.
100 `-z` can also be used to force compression of an already compressed
114 Benchmark mode, using `#` compression level.
123 Compression level, with # being any value from 1 to 12.
124 Higher values trade compression speed for compression ratio.
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| /external/zstd/ |
| D | README.md | 3 __Zstandard__, or `zstd` as short version, is a fast lossless compression algorithm,
4 targeting real-time compression scenarios at zlib-level and better compression ratios.
34 For reference, several fast compression algorithms were tested and compared
39 on the [Silesia compression corpus].
42 [Silesia compression corpus]: http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia
45 | Compressor name | Ratio | Compression| Decompress.|
62 The negative compression levels, specified with `--fast=#`,
63 offer faster compression and decompression speed
64 at the cost of compression ratio (compared to level 1).
66 Zstd can also offer stronger compression ratios at the cost of compression speed.
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| D | CHANGELOG | 2 perf: Regain Minimal memset()-ing During Reuse of Compression Contexts (@Cyan4973, #2969)
7 perf: rebalanced compression levels, to better match the intended speed/level curve, by @senhuang42
12 perf: faster mid-level compression speed in presence of highly repetitive patterns, by @senhuang42
13 perf: minor compression ratio improvements for small data at high levels, by @cyan4973
15 perf: faster compression speed on incompressible data, by @bindhvo
40 perf: Significant speed improvements for middle compression levels (#2494, @senhuang42 @terrelln)
41 perf: Block splitter to improve compression ratio, enabled by default for high compression levels (…
43 perf: Reduced stack usage during compression and decompression entropy stage (#2522 #2524, @terrell…
48 bug: Ensure `ZSTD_estimateCCtxSize*() `monotonically increases with compression level (#2538, @senh…
51 bug: Fix superblock compression divide by zero bug (#2592, @senhuang42)
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| /external/squashfs-tools/RELEASE-READMEs/ |
| D | README-4.3 | 8 there are substantial improvements to stability, new compression options
22 2. GZIP compressor now supports compression options, allowing different
23 compression levels to be used.
25 3. Rewritten LZO compressor with compression options, allowing different
26 LZO algorithms and different compression levels to be used.
38 7. The -stat option in Unsquashfs now displays the compression options
40 the compression algorithm used.
65 New compression options and compressors are now supported.
70 -Xcompression-level <compression-level>
71 <compression-level> should be 1 .. 9 (default 9)
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| /external/trace-cmd/lib/trace-cmd/ |
| D | trace-compress.c | 113 * tracecmd_compress_lseek - Move the read/write pointer into the compression buffer
114 * @handle: compression handle
164 * tracecmd_compress_pread - pread() on compression buffer
165 * @handle: compression handle
170 * Read a @len of data from the compression buffer at given @offset,
189 * tracecmd_compress_buffer_read - read() from compression buffer
190 * @handle: compression handle
194 * Read a @len of data from the compression buffer
213 * tracecmd_compress_reset - Reset the compression buffer
214 * @handle: compression handle
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| /external/libcups/examples/ |
| D | ipp-everywhere.test | 49 …EXPECT compression-supported OF-TYPE keyword IN-GROUP printer-attributes-tag WITH-VALUE "deflate" …
50 …EXPECT compression-supported OF-TYPE keyword IN-GROUP printer-attributes-tag WITH-VALUE "gzip" DEF…
211 ATTR keyword compression deflate
213 COMPRESSION deflate
234 ATTR keyword compression gzip
236 COMPRESSION gzip
277 ATTR keyword compression deflate
279 COMPRESSION deflate
300 ATTR keyword compression gzip
302 COMPRESSION gzip
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| /external/squashfs-tools/squashfs-tools/ |
| D | lzo_wrapper.c | 21 * Support for LZO compression http://www.oberhumer.com/opensource/lzo
43 /* default LZO compression algorithm and compression level */
47 /* user specified compression level */
89 "compression level\n"); in lzo_options()
111 fprintf(stderr, "lzo: compression algorithm should be one of:\n"); in lzo_options()
124 * compression level has been set (-Xalgorithm used after -Xcompression-level)
132 * Use of compression level only makes sense for in lzo_options_post()
160 * This function returns a pointer to the compression options structure
161 * to be stored (and the size), or NULL if there are no compression
170 * If default compression options of SQUASHFS_LZO1X_999 and in lzo_dump_options()
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| /external/zstd/contrib/linux-kernel/ |
| D | linux_zstd.h | 67 * zstd_min_clevel() - minimum allowed compression level
69 * Return: The minimum allowed compression level.
74 * zstd_max_clevel() - maximum allowed compression level
76 * Return: The maximum allowed compression level.
83 * enum zstd_strategy - zstd compression search strategy
90 * struct zstd_compression_parameters - zstd compression parameters
92 * compression, and more memory needed during decompression.
93 * @chainLog: Fully searched segment. Larger means more compression,
95 * @hashLog: Dispatch table. Larger means more compression,
97 * @searchLog: Number of searches. Larger means more compression and slower.
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| /external/ImageMagick/coders/ |
| D | exr.c | 167 compression; in ReadEXRImage() local
214 image->compression=NoCompression; in ReadEXRImage()
215 compression=ImfHeaderCompression(hdr_info); in ReadEXRImage()
216 if (compression == IMF_RLE_COMPRESSION) in ReadEXRImage()
217 image->compression=RLECompression; in ReadEXRImage()
218 if (compression == IMF_ZIPS_COMPRESSION) in ReadEXRImage()
219 image->compression=ZipSCompression; in ReadEXRImage()
220 if (compression == IMF_ZIP_COMPRESSION) in ReadEXRImage()
221 image->compression=ZipCompression; in ReadEXRImage()
222 if (compression == IMF_PIZ_COMPRESSION) in ReadEXRImage()
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| /external/bzip2/ |
| D | bzip2.1 | 37 text compression algorithm, and Huffman coding. Compression is
105 As with compression, supplying no
120 stdout. Compression of multiple files
146 Compression is always performed, even if the compressed
149 tend to get larger, since the compression mechanism has a constant
199 The complement to \-d: forces compression, regardless of the
220 Keep (don't delete) input files during compression
224 Reduce memory usage, for compression, decompression and testing. Files
229 During compression, \-s selects a block size of 200k, which limits
230 memory use to around the same figure, at the expense of your compression
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| /external/rust/crates/flate2/src/ |
| D | lib.rs | 1 //! A DEFLATE-based stream compression/decompression library
3 //! This library provides support for compression and decompression of
31 //! dependencies links the original zlib so you cannot use zlib-ng-compat. The compression ratios
48 //! use flate2::Compression;
54 //! let mut encoder = GzEncoder::new(Vec::new(), Compression::default());
154 /// When compressing data, the compression level can be specified by a value in
157 pub struct Compression(u32); struct
159 impl Compression { implementation
160 /// Creates a new description of the compression level with an explicitly
164 /// compression" and 9 means "take as long as you'd like".
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| /external/grpc-grpc/src/ruby/ext/grpc/ |
| D | rb_compression_options.c | 25 #include <grpc/compression.h>
38 /* Ruby Ids for the names of valid compression levels. */
46 * compression settings. */
51 /* The actual compression options that's being wrapped */
55 /* Destroys the compression options instances and free the
56 * wrapped grpc compression options. */
87 Allocate the wrapped grpc compression options and
103 /* Disables a compression algorithm, given the GRPC core internal number of a
104 * compression algorithm. */
121 /* Gets the compression internal enum value of a compression level given its
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| /external/zstd/lib/ |
| D | zstd.h | 44 zstd, short for Zstandard, is a fast lossless compression algorithm, targeting
45 real-time compression scenarios at zlib-level and better compression ratios.
46 The zstd compression library provides in-memory compression and decompression
49 The library supports regular compression levels from 1 up to ZSTD_maxCLevel(),
52 compression levels, which extend the range of speed vs. ratio preferences.
53 The lower the level, the faster the speed (at the cost of compression).
55 Compression can be done in:
58 - unbounded multiple steps (described as Streaming compression)
60 The compression ratio achievable on small data can be highly improved using
61 a dictionary. Dictionary compression can be performed in:
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| /external/rust/crates/grpcio-sys/grpc/spm-core-include/grpc/impl/codegen/ |
| D | compression_types.h | 28 /** To be used as initial metadata key for the request of a concrete compression
37 /** Default compression algorithm for the channel.
41 /** Default compression level for the channel.
44 /** Compression algorithms supported by the channel.
55 /** The various compression algorithms supported by gRPC (not sorted by
56 * compression level) */
61 /* EXPERIMENTAL: Stream compression is currently experimental. */
67 /** Compression levels allow a party with knowledge of its peer's accepted
68 * encodings to request compression in an abstract way. The level-algorithm
70 * compression algorithms. */
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| /external/rust/crates/grpcio-sys/grpc/include/grpc/impl/codegen/ |
| D | compression_types.h | 28 /** To be used as initial metadata key for the request of a concrete compression
37 /** Default compression algorithm for the channel.
41 /** Default compression level for the channel.
44 /** Compression algorithms supported by the channel.
55 /** The various compression algorithms supported by gRPC (not sorted by
56 * compression level) */
61 /* EXPERIMENTAL: Stream compression is currently experimental. */
67 /** Compression levels allow a party with knowledge of its peer's accepted
68 * encodings to request compression in an abstract way. The level-algorithm
70 * compression algorithms. */
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| /external/zstd/doc/ |
| D | zstd_manual.html | 15 <li><a href="#Chapter5">Advanced compression API (Requires v1.4.0+)</a></li>
18 <li><a href="#Chapter8">Streaming compression - HowTo</a></li>
27 <li><a href="#Chapter17">Advanced compression functions</a></li>
31 <li><a href="#Chapter21">Buffer-less streaming compression (synchronous mode)</a></li>
37 zstd, short for Zstandard, is a fast lossless compression algorithm, targeting
38 real-time compression scenarios at zlib-level and better compression ratios.
39 The zstd compression library provides in-memory compression and decompression
42 The library supports regular compression levels from 1 up to ZSTD_maxCLevel(),
45 compression levels, which extend the range of speed vs. ratio preferences.
46 The lower the level, the faster the speed (at the cost of compression).
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| /external/tensorflow/tensorflow/core/data/ |
| D | snapshot_utils_test.cc | 20 #include "tensorflow/core/lib/io/compression.h"
85 SnapshotRoundTrip(io::compression::kNone, 1); in TEST()
86 SnapshotRoundTrip(io::compression::kGzip, 1); in TEST()
87 SnapshotRoundTrip(io::compression::kSnappy, 1); in TEST()
89 SnapshotRoundTrip(io::compression::kNone, 2); in TEST()
90 SnapshotRoundTrip(io::compression::kGzip, 2); in TEST()
91 SnapshotRoundTrip(io::compression::kSnappy, 2); in TEST()
125 SnapshotReaderBenchmarkLoop(state, io::compression::kNone, 1); in SnapshotCustomReaderNoneBenchmark()
129 SnapshotReaderBenchmarkLoop(state, io::compression::kGzip, 1); in SnapshotCustomReaderGzipBenchmark()
133 SnapshotReaderBenchmarkLoop(state, io::compression::kSnappy, 1); in SnapshotCustomReaderSnappyBenchmark()
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