mirror of https://github.com/docker/buildx.git
vendor: github.com/klauspost/compress v1.17.2
full diff: https://github.com/klauspost/compress/compare/v1.16.3...v1.17.2 Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn
parent
271a467612
commit
f353814390
2
go.mod
2
go.mod
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@ -102,7 +102,7 @@ require (
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github.com/inconshreveable/mousetrap v1.1.0 // indirect
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github.com/josharian/intern v1.0.0 // indirect
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github.com/json-iterator/go v1.1.12 // indirect
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github.com/klauspost/compress v1.16.3 // indirect
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github.com/klauspost/compress v1.17.2 // indirect
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github.com/mailru/easyjson v0.7.6 // indirect
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github.com/mattn/go-shellwords v1.0.12 // indirect
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github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
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4
go.sum
4
go.sum
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@ -352,8 +352,8 @@ github.com/juju/loggo v0.0.0-20190526231331-6e530bcce5d8/go.mod h1:vgyd7OREkbtVE
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github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
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github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
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github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
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github.com/klauspost/compress v1.16.3 h1:XuJt9zzcnaz6a16/OU53ZjWp/v7/42WcR5t2a0PcNQY=
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github.com/klauspost/compress v1.16.3/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
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github.com/klauspost/compress v1.17.2 h1:RlWWUY/Dr4fL8qk9YG7DTZ7PDgME2V4csBXA8L/ixi4=
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github.com/klauspost/compress v1.17.2/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
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github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
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@ -3,7 +3,7 @@
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before:
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hooks:
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- ./gen.sh
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- go install mvdan.cc/garble@v0.9.3
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- go install mvdan.cc/garble@v0.10.1
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builds:
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-
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@ -92,16 +92,7 @@ builds:
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archives:
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-
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id: s2-binaries
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name_template: "s2-{{ .Os }}_{{ .Arch }}_{{ .Version }}"
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replacements:
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aix: AIX
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darwin: OSX
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linux: Linux
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windows: Windows
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386: i386
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amd64: x86_64
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freebsd: FreeBSD
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netbsd: NetBSD
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name_template: "s2-{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
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format_overrides:
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- goos: windows
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format: zip
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@ -125,7 +116,7 @@ changelog:
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nfpms:
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-
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file_name_template: "s2_package_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
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file_name_template: "s2_package__{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
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vendor: Klaus Post
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homepage: https://github.com/klauspost/compress
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maintainer: Klaus Post <klauspost@gmail.com>
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@ -134,8 +125,3 @@ nfpms:
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formats:
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- deb
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- rpm
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replacements:
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darwin: Darwin
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linux: Linux
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freebsd: FreeBSD
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amd64: x86_64
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@ -16,6 +16,37 @@ This package provides various compression algorithms.
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# changelog
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* Sept 19th, 2023 - [v1.17.0](https://github.com/klauspost/compress/releases/tag/v1.17.0)
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* Add experimental dictionary builder https://github.com/klauspost/compress/pull/853
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* Add xerial snappy read/writer https://github.com/klauspost/compress/pull/838
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* flate: Add limited window compression https://github.com/klauspost/compress/pull/843
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* s2: Do 2 overlapping match checks https://github.com/klauspost/compress/pull/839
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* flate: Add amd64 assembly matchlen https://github.com/klauspost/compress/pull/837
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* gzip: Copy bufio.Reader on Reset by @thatguystone in https://github.com/klauspost/compress/pull/860
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* July 1st, 2023 - [v1.16.7](https://github.com/klauspost/compress/releases/tag/v1.16.7)
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* zstd: Fix default level first dictionary encode https://github.com/klauspost/compress/pull/829
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* s2: add GetBufferCapacity() method by @GiedriusS in https://github.com/klauspost/compress/pull/832
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* June 13, 2023 - [v1.16.6](https://github.com/klauspost/compress/releases/tag/v1.16.6)
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* zstd: correctly ignore WithEncoderPadding(1) by @ianlancetaylor in https://github.com/klauspost/compress/pull/806
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* zstd: Add amd64 match length assembly https://github.com/klauspost/compress/pull/824
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* gzhttp: Handle informational headers by @rtribotte in https://github.com/klauspost/compress/pull/815
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* s2: Improve Better compression slightly https://github.com/klauspost/compress/pull/663
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* Apr 16, 2023 - [v1.16.5](https://github.com/klauspost/compress/releases/tag/v1.16.5)
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* zstd: readByte needs to use io.ReadFull by @jnoxon in https://github.com/klauspost/compress/pull/802
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* gzip: Fix WriterTo after initial read https://github.com/klauspost/compress/pull/804
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* Apr 5, 2023 - [v1.16.4](https://github.com/klauspost/compress/releases/tag/v1.16.4)
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* zstd: Improve zstd best efficiency by @greatroar and @klauspost in https://github.com/klauspost/compress/pull/784
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* zstd: Respect WithAllLitEntropyCompression https://github.com/klauspost/compress/pull/792
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* zstd: Fix amd64 not always detecting corrupt data https://github.com/klauspost/compress/pull/785
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* zstd: Various minor improvements by @greatroar in https://github.com/klauspost/compress/pull/788 https://github.com/klauspost/compress/pull/794 https://github.com/klauspost/compress/pull/795
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* s2: Fix huge block overflow https://github.com/klauspost/compress/pull/779
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* s2: Allow CustomEncoder fallback https://github.com/klauspost/compress/pull/780
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* gzhttp: Suppport ResponseWriter Unwrap() in gzhttp handler by @jgimenez in https://github.com/klauspost/compress/pull/799
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* Mar 13, 2023 - [v1.16.1](https://github.com/klauspost/compress/releases/tag/v1.16.1)
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* zstd: Speed up + improve best encoder by @greatroar in https://github.com/klauspost/compress/pull/776
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* gzhttp: Add optional [BREACH mitigation](https://github.com/klauspost/compress/tree/master/gzhttp#breach-mitigation). https://github.com/klauspost/compress/pull/762 https://github.com/klauspost/compress/pull/768 https://github.com/klauspost/compress/pull/769 https://github.com/klauspost/compress/pull/770 https://github.com/klauspost/compress/pull/767
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@ -31,6 +62,9 @@ This package provides various compression algorithms.
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* s2: Support io.ReaderAt in ReadSeeker. https://github.com/klauspost/compress/pull/747
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* s2c/s2sx: Use concurrent decoding. https://github.com/klauspost/compress/pull/746
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<details>
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<summary>See changes to v1.15.x</summary>
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* Jan 21st, 2023 (v1.15.15)
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* deflate: Improve level 7-9 by @klauspost in https://github.com/klauspost/compress/pull/739
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* zstd: Add delta encoding support by @greatroar in https://github.com/klauspost/compress/pull/728
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@ -157,6 +191,8 @@ Stream decompression is now faster on asynchronous, since the goroutine allocati
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While the release has been extensively tested, it is recommended to testing when upgrading.
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</details>
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<details>
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<summary>See changes to v1.14.x</summary>
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@ -615,6 +651,10 @@ Here are other packages of good quality and pure Go (no cgo wrappers or autoconv
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* [github.com/pierrec/lz4](https://github.com/pierrec/lz4) - strong multithreaded LZ4 compression.
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* [github.com/cosnicolaou/pbzip2](https://github.com/cosnicolaou/pbzip2) - multithreaded bzip2 decompression.
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* [github.com/dsnet/compress](https://github.com/dsnet/compress) - brotli decompression, bzip2 writer.
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* [github.com/ronanh/intcomp](https://github.com/ronanh/intcomp) - Integer compression.
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* [github.com/spenczar/fpc](https://github.com/spenczar/fpc) - Float compression.
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* [github.com/minio/zipindex](https://github.com/minio/zipindex) - External ZIP directory index.
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* [github.com/ybirader/pzip](https://github.com/ybirader/pzip) - Fast concurrent zip archiver and extractor.
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# license
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@ -0,0 +1,25 @@
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# Security Policy
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## Supported Versions
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Security updates are applied only to the latest release.
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## Vulnerability Definition
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A security vulnerability is a bug that with certain input triggers a crash or an infinite loop. Most calls will have varying execution time and only in rare cases will slow operation be considered a security vulnerability.
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Corrupted output generally is not considered a security vulnerability, unless independent operations are able to affect each other. Note that not all functionality is re-entrant and safe to use concurrently.
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Out-of-memory crashes only applies if the en/decoder uses an abnormal amount of memory, with appropriate options applied, to limit maximum window size, concurrency, etc. However, if you are in doubt you are welcome to file a security issue.
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It is assumed that all callers are trusted, meaning internal data exposed through reflection or inspection of returned data structures is not considered a vulnerability.
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Vulnerabilities resulting from compiler/assembler errors should be reported upstream. Depending on the severity this package may or may not implement a workaround.
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## Reporting a Vulnerability
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If you have discovered a security vulnerability in this project, please report it privately. **Do not disclose it as a public issue.** This gives us time to work with you to fix the issue before public exposure, reducing the chance that the exploit will be used before a patch is released.
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Please disclose it at [security advisory](https://github.com/klauspost/compress/security/advisories/new). If possible please provide a minimal reproducer. If the issue only applies to a single platform, it would be helpful to provide access to that.
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This project is maintained by a team of volunteers on a reasonable-effort basis. As such, vulnerabilities will be disclosed in a best effort base.
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@ -152,12 +152,11 @@ func (b *bitWriter) flushAlign() {
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// close will write the alignment bit and write the final byte(s)
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// to the output.
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func (b *bitWriter) close() error {
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func (b *bitWriter) close() {
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// End mark
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b.addBits16Clean(1, 1)
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// flush until next byte.
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b.flushAlign()
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return nil
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}
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// reset and continue writing by appending to out.
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|
|
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@ -199,7 +199,8 @@ func (s *Scratch) compress(src []byte) error {
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c2.flush(s.actualTableLog)
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c1.flush(s.actualTableLog)
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return s.bw.close()
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s.bw.close()
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return nil
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}
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// writeCount will write the normalized histogram count to header.
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|
|
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@ -13,14 +13,6 @@ type bitWriter struct {
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out []byte
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}
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// bitMask16 is bitmasks. Has extra to avoid bounds check.
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var bitMask16 = [32]uint16{
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0, 1, 3, 7, 0xF, 0x1F,
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0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF,
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0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF, 0xFFFF,
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0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
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0xFFFF, 0xFFFF} /* up to 16 bits */
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// addBits16Clean will add up to 16 bits. value may not contain more set bits than indicated.
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// It will not check if there is space for them, so the caller must ensure that it has flushed recently.
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func (b *bitWriter) addBits16Clean(value uint16, bits uint8) {
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|
@ -102,10 +94,9 @@ func (b *bitWriter) flushAlign() {
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// close will write the alignment bit and write the final byte(s)
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// to the output.
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func (b *bitWriter) close() error {
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func (b *bitWriter) close() {
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// End mark
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b.addBits16Clean(1, 1)
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// flush until next byte.
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b.flushAlign()
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return nil
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}
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|
|
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|
@ -227,10 +227,10 @@ func EstimateSizes(in []byte, s *Scratch) (tableSz, dataSz, reuseSz int, err err
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}
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func (s *Scratch) compress1X(src []byte) ([]byte, error) {
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return s.compress1xDo(s.Out, src)
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return s.compress1xDo(s.Out, src), nil
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}
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|
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func (s *Scratch) compress1xDo(dst, src []byte) ([]byte, error) {
|
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func (s *Scratch) compress1xDo(dst, src []byte) []byte {
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var bw = bitWriter{out: dst}
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|
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// N is length divisible by 4.
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|
|
@ -260,8 +260,8 @@ func (s *Scratch) compress1xDo(dst, src []byte) ([]byte, error) {
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bw.encTwoSymbols(cTable, tmp[1], tmp[0])
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}
|
||||
}
|
||||
err := bw.close()
|
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return bw.out, err
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bw.close()
|
||||
return bw.out
|
||||
}
|
||||
|
||||
var sixZeros [6]byte
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|
|
@ -283,12 +283,8 @@ func (s *Scratch) compress4X(src []byte) ([]byte, error) {
|
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}
|
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src = src[len(toDo):]
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||||
|
||||
var err error
|
||||
idx := len(s.Out)
|
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s.Out, err = s.compress1xDo(s.Out, toDo)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
s.Out = s.compress1xDo(s.Out, toDo)
|
||||
if len(s.Out)-idx > math.MaxUint16 {
|
||||
// We cannot store the size in the jump table
|
||||
return nil, ErrIncompressible
|
||||
|
|
@ -315,7 +311,6 @@ func (s *Scratch) compress4Xp(src []byte) ([]byte, error) {
|
|||
|
||||
segmentSize := (len(src) + 3) / 4
|
||||
var wg sync.WaitGroup
|
||||
var errs [4]error
|
||||
wg.Add(4)
|
||||
for i := 0; i < 4; i++ {
|
||||
toDo := src
|
||||
|
|
@ -326,15 +321,12 @@ func (s *Scratch) compress4Xp(src []byte) ([]byte, error) {
|
|||
|
||||
// Separate goroutine for each block.
|
||||
go func(i int) {
|
||||
s.tmpOut[i], errs[i] = s.compress1xDo(s.tmpOut[i][:0], toDo)
|
||||
s.tmpOut[i] = s.compress1xDo(s.tmpOut[i][:0], toDo)
|
||||
wg.Done()
|
||||
}(i)
|
||||
}
|
||||
wg.Wait()
|
||||
for i := 0; i < 4; i++ {
|
||||
if errs[i] != nil {
|
||||
return nil, errs[i]
|
||||
}
|
||||
o := s.tmpOut[i]
|
||||
if len(o) > math.MaxUint16 {
|
||||
// We cannot store the size in the jump table
|
||||
|
|
|
|||
|
|
@ -253,7 +253,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
|
|||
|
||||
switch d.actualTableLog {
|
||||
case 8:
|
||||
const shift = 8 - 8
|
||||
const shift = 0
|
||||
for br.off >= 4 {
|
||||
br.fillFast()
|
||||
v := dt[uint8(br.value>>(56+shift))]
|
||||
|
|
|
|||
|
|
@ -87,18 +87,6 @@ func emitCopy(dst []byte, offset, length int) int {
|
|||
return i + 2
|
||||
}
|
||||
|
||||
// extendMatch returns the largest k such that k <= len(src) and that
|
||||
// src[i:i+k-j] and src[j:k] have the same contents.
|
||||
//
|
||||
// It assumes that:
|
||||
//
|
||||
// 0 <= i && i < j && j <= len(src)
|
||||
func extendMatch(src []byte, i, j int) int {
|
||||
for ; j < len(src) && src[i] == src[j]; i, j = i+1, j+1 {
|
||||
}
|
||||
return j
|
||||
}
|
||||
|
||||
func hash(u, shift uint32) uint32 {
|
||||
return (u * 0x1e35a7bd) >> shift
|
||||
}
|
||||
|
|
|
|||
|
|
@ -304,7 +304,7 @@ import "github.com/klauspost/compress/zstd"
|
|||
|
||||
// Create a reader that caches decompressors.
|
||||
// For this operation type we supply a nil Reader.
|
||||
var decoder, _ = zstd.NewReader(nil, WithDecoderConcurrency(0))
|
||||
var decoder, _ = zstd.NewReader(nil, zstd.WithDecoderConcurrency(0))
|
||||
|
||||
// Decompress a buffer. We don't supply a destination buffer,
|
||||
// so it will be allocated by the decoder.
|
||||
|
|
|
|||
|
|
@ -17,7 +17,6 @@ import (
|
|||
// for aligning the input.
|
||||
type bitReader struct {
|
||||
in []byte
|
||||
off uint // next byte to read is at in[off - 1]
|
||||
value uint64 // Maybe use [16]byte, but shifting is awkward.
|
||||
bitsRead uint8
|
||||
}
|
||||
|
|
@ -28,7 +27,6 @@ func (b *bitReader) init(in []byte) error {
|
|||
return errors.New("corrupt stream: too short")
|
||||
}
|
||||
b.in = in
|
||||
b.off = uint(len(in))
|
||||
// The highest bit of the last byte indicates where to start
|
||||
v := in[len(in)-1]
|
||||
if v == 0 {
|
||||
|
|
@ -69,21 +67,19 @@ func (b *bitReader) fillFast() {
|
|||
if b.bitsRead < 32 {
|
||||
return
|
||||
}
|
||||
// 2 bounds checks.
|
||||
v := b.in[b.off-4:]
|
||||
v = v[:4]
|
||||
v := b.in[len(b.in)-4:]
|
||||
b.in = b.in[:len(b.in)-4]
|
||||
low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
|
||||
b.value = (b.value << 32) | uint64(low)
|
||||
b.bitsRead -= 32
|
||||
b.off -= 4
|
||||
}
|
||||
|
||||
// fillFastStart() assumes the bitreader is empty and there is at least 8 bytes to read.
|
||||
func (b *bitReader) fillFastStart() {
|
||||
// Do single re-slice to avoid bounds checks.
|
||||
b.value = binary.LittleEndian.Uint64(b.in[b.off-8:])
|
||||
v := b.in[len(b.in)-8:]
|
||||
b.in = b.in[:len(b.in)-8]
|
||||
b.value = binary.LittleEndian.Uint64(v)
|
||||
b.bitsRead = 0
|
||||
b.off -= 8
|
||||
}
|
||||
|
||||
// fill() will make sure at least 32 bits are available.
|
||||
|
|
@ -91,25 +87,25 @@ func (b *bitReader) fill() {
|
|||
if b.bitsRead < 32 {
|
||||
return
|
||||
}
|
||||
if b.off >= 4 {
|
||||
v := b.in[b.off-4:]
|
||||
v = v[:4]
|
||||
if len(b.in) >= 4 {
|
||||
v := b.in[len(b.in)-4:]
|
||||
b.in = b.in[:len(b.in)-4]
|
||||
low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
|
||||
b.value = (b.value << 32) | uint64(low)
|
||||
b.bitsRead -= 32
|
||||
b.off -= 4
|
||||
return
|
||||
}
|
||||
for b.off > 0 {
|
||||
b.value = (b.value << 8) | uint64(b.in[b.off-1])
|
||||
b.bitsRead -= 8
|
||||
b.off--
|
||||
|
||||
b.bitsRead -= uint8(8 * len(b.in))
|
||||
for len(b.in) > 0 {
|
||||
b.value = (b.value << 8) | uint64(b.in[len(b.in)-1])
|
||||
b.in = b.in[:len(b.in)-1]
|
||||
}
|
||||
}
|
||||
|
||||
// finished returns true if all bits have been read from the bit stream.
|
||||
func (b *bitReader) finished() bool {
|
||||
return b.off == 0 && b.bitsRead >= 64
|
||||
return len(b.in) == 0 && b.bitsRead >= 64
|
||||
}
|
||||
|
||||
// overread returns true if more bits have been requested than is on the stream.
|
||||
|
|
@ -119,7 +115,7 @@ func (b *bitReader) overread() bool {
|
|||
|
||||
// remain returns the number of bits remaining.
|
||||
func (b *bitReader) remain() uint {
|
||||
return b.off*8 + 64 - uint(b.bitsRead)
|
||||
return 8*uint(len(b.in)) + 64 - uint(b.bitsRead)
|
||||
}
|
||||
|
||||
// close the bitstream and returns an error if out-of-buffer reads occurred.
|
||||
|
|
|
|||
|
|
@ -97,12 +97,11 @@ func (b *bitWriter) flushAlign() {
|
|||
|
||||
// close will write the alignment bit and write the final byte(s)
|
||||
// to the output.
|
||||
func (b *bitWriter) close() error {
|
||||
func (b *bitWriter) close() {
|
||||
// End mark
|
||||
b.addBits16Clean(1, 1)
|
||||
// flush until next byte.
|
||||
b.flushAlign()
|
||||
return nil
|
||||
}
|
||||
|
||||
// reset and continue writing by appending to out.
|
||||
|
|
|
|||
|
|
@ -592,7 +592,7 @@ func (b *blockDec) prepareSequences(in []byte, hist *history) (err error) {
|
|||
}
|
||||
seq.fse.setRLE(symb)
|
||||
if debugDecoder {
|
||||
printf("RLE set to %+v, code: %v", symb, v)
|
||||
printf("RLE set to 0x%x, code: %v", symb, v)
|
||||
}
|
||||
case compModeFSE:
|
||||
println("Reading table for", tableIndex(i))
|
||||
|
|
|
|||
|
|
@ -361,14 +361,21 @@ func (b *blockEnc) encodeLits(lits []byte, raw bool) error {
|
|||
if len(lits) >= 1024 {
|
||||
// Use 4 Streams.
|
||||
out, reUsed, err = huff0.Compress4X(lits, b.litEnc)
|
||||
} else if len(lits) > 32 {
|
||||
} else if len(lits) > 16 {
|
||||
// Use 1 stream
|
||||
single = true
|
||||
out, reUsed, err = huff0.Compress1X(lits, b.litEnc)
|
||||
} else {
|
||||
err = huff0.ErrIncompressible
|
||||
}
|
||||
|
||||
if err == nil && len(out)+5 > len(lits) {
|
||||
// If we are close, we may still be worse or equal to raw.
|
||||
var lh literalsHeader
|
||||
lh.setSizes(len(out), len(lits), single)
|
||||
if len(out)+lh.size() >= len(lits) {
|
||||
err = huff0.ErrIncompressible
|
||||
}
|
||||
}
|
||||
switch err {
|
||||
case huff0.ErrIncompressible:
|
||||
if debugEncoder {
|
||||
|
|
@ -473,7 +480,7 @@ func (b *blockEnc) encode(org []byte, raw, rawAllLits bool) error {
|
|||
return b.encodeLits(b.literals, rawAllLits)
|
||||
}
|
||||
// We want some difference to at least account for the headers.
|
||||
saved := b.size - len(b.literals) - (b.size >> 5)
|
||||
saved := b.size - len(b.literals) - (b.size >> 6)
|
||||
if saved < 16 {
|
||||
if org == nil {
|
||||
return errIncompressible
|
||||
|
|
@ -503,7 +510,7 @@ func (b *blockEnc) encode(org []byte, raw, rawAllLits bool) error {
|
|||
if len(b.literals) >= 1024 && !raw {
|
||||
// Use 4 Streams.
|
||||
out, reUsed, err = huff0.Compress4X(b.literals, b.litEnc)
|
||||
} else if len(b.literals) > 32 && !raw {
|
||||
} else if len(b.literals) > 16 && !raw {
|
||||
// Use 1 stream
|
||||
single = true
|
||||
out, reUsed, err = huff0.Compress1X(b.literals, b.litEnc)
|
||||
|
|
@ -511,6 +518,17 @@ func (b *blockEnc) encode(org []byte, raw, rawAllLits bool) error {
|
|||
err = huff0.ErrIncompressible
|
||||
}
|
||||
|
||||
if err == nil && len(out)+5 > len(b.literals) {
|
||||
// If we are close, we may still be worse or equal to raw.
|
||||
var lh literalsHeader
|
||||
lh.setSize(len(b.literals))
|
||||
szRaw := lh.size()
|
||||
lh.setSizes(len(out), len(b.literals), single)
|
||||
szComp := lh.size()
|
||||
if len(out)+szComp >= len(b.literals)+szRaw {
|
||||
err = huff0.ErrIncompressible
|
||||
}
|
||||
}
|
||||
switch err {
|
||||
case huff0.ErrIncompressible:
|
||||
lh.setType(literalsBlockRaw)
|
||||
|
|
@ -773,16 +791,16 @@ func (b *blockEnc) encode(org []byte, raw, rawAllLits bool) error {
|
|||
ml.flush(mlEnc.actualTableLog)
|
||||
of.flush(ofEnc.actualTableLog)
|
||||
ll.flush(llEnc.actualTableLog)
|
||||
err = wr.close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
wr.close()
|
||||
b.output = wr.out
|
||||
|
||||
// Maybe even add a bigger margin.
|
||||
if len(b.output)-3-bhOffset >= b.size {
|
||||
// Maybe even add a bigger margin.
|
||||
// Discard and encode as raw block.
|
||||
b.output = b.encodeRawTo(b.output[:bhOffset], org)
|
||||
b.popOffsets()
|
||||
b.litEnc.Reuse = huff0.ReusePolicyNone
|
||||
return errIncompressible
|
||||
return nil
|
||||
}
|
||||
|
||||
// Size is output minus block header.
|
||||
|
|
|
|||
|
|
@ -109,7 +109,7 @@ func (r *readerWrapper) readBig(n int, dst []byte) ([]byte, error) {
|
|||
}
|
||||
|
||||
func (r *readerWrapper) readByte() (byte, error) {
|
||||
n2, err := r.r.Read(r.tmp[:1])
|
||||
n2, err := io.ReadFull(r.r, r.tmp[:1])
|
||||
if err != nil {
|
||||
if err == io.EOF {
|
||||
err = io.ErrUnexpectedEOF
|
||||
|
|
|
|||
|
|
@ -455,12 +455,7 @@ func (d *Decoder) nextBlock(blocking bool) (ok bool) {
|
|||
}
|
||||
|
||||
if len(next.b) > 0 {
|
||||
n, err := d.current.crc.Write(next.b)
|
||||
if err == nil {
|
||||
if n != len(next.b) {
|
||||
d.current.err = io.ErrShortWrite
|
||||
}
|
||||
}
|
||||
d.current.crc.Write(next.b)
|
||||
}
|
||||
if next.err == nil && next.d != nil && next.d.hasCRC {
|
||||
got := uint32(d.current.crc.Sum64())
|
||||
|
|
|
|||
|
|
@ -107,7 +107,7 @@ func WithDecoderDicts(dicts ...[]byte) DOption {
|
|||
}
|
||||
}
|
||||
|
||||
// WithEncoderDictRaw registers a dictionary that may be used by the decoder.
|
||||
// WithDecoderDictRaw registers a dictionary that may be used by the decoder.
|
||||
// The slice content can be arbitrary data.
|
||||
func WithDecoderDictRaw(id uint32, content []byte) DOption {
|
||||
return func(o *decoderOptions) error {
|
||||
|
|
|
|||
|
|
@ -1,10 +1,13 @@
|
|||
package zstd
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"math"
|
||||
"sort"
|
||||
|
||||
"github.com/klauspost/compress/huff0"
|
||||
)
|
||||
|
|
@ -14,9 +17,8 @@ type dict struct {
|
|||
|
||||
litEnc *huff0.Scratch
|
||||
llDec, ofDec, mlDec sequenceDec
|
||||
//llEnc, ofEnc, mlEnc []*fseEncoder
|
||||
offsets [3]int
|
||||
content []byte
|
||||
offsets [3]int
|
||||
content []byte
|
||||
}
|
||||
|
||||
const dictMagic = "\x37\xa4\x30\xec"
|
||||
|
|
@ -159,3 +161,374 @@ func InspectDictionary(b []byte) (interface {
|
|||
d, err := loadDict(b)
|
||||
return d, err
|
||||
}
|
||||
|
||||
type BuildDictOptions struct {
|
||||
// Dictionary ID.
|
||||
ID uint32
|
||||
|
||||
// Content to use to create dictionary tables.
|
||||
Contents [][]byte
|
||||
|
||||
// History to use for all blocks.
|
||||
History []byte
|
||||
|
||||
// Offsets to use.
|
||||
Offsets [3]int
|
||||
|
||||
// CompatV155 will make the dictionary compatible with Zstd v1.5.5 and earlier.
|
||||
// See https://github.com/facebook/zstd/issues/3724
|
||||
CompatV155 bool
|
||||
|
||||
// Use the specified encoder level.
|
||||
// The dictionary will be built using the specified encoder level,
|
||||
// which will reflect speed and make the dictionary tailored for that level.
|
||||
// If not set SpeedBestCompression will be used.
|
||||
Level EncoderLevel
|
||||
|
||||
// DebugOut will write stats and other details here if set.
|
||||
DebugOut io.Writer
|
||||
}
|
||||
|
||||
func BuildDict(o BuildDictOptions) ([]byte, error) {
|
||||
initPredefined()
|
||||
hist := o.History
|
||||
contents := o.Contents
|
||||
debug := o.DebugOut != nil
|
||||
println := func(args ...interface{}) {
|
||||
if o.DebugOut != nil {
|
||||
fmt.Fprintln(o.DebugOut, args...)
|
||||
}
|
||||
}
|
||||
printf := func(s string, args ...interface{}) {
|
||||
if o.DebugOut != nil {
|
||||
fmt.Fprintf(o.DebugOut, s, args...)
|
||||
}
|
||||
}
|
||||
print := func(args ...interface{}) {
|
||||
if o.DebugOut != nil {
|
||||
fmt.Fprint(o.DebugOut, args...)
|
||||
}
|
||||
}
|
||||
|
||||
if int64(len(hist)) > dictMaxLength {
|
||||
return nil, fmt.Errorf("dictionary of size %d > %d", len(hist), int64(dictMaxLength))
|
||||
}
|
||||
if len(hist) < 8 {
|
||||
return nil, fmt.Errorf("dictionary of size %d < %d", len(hist), 8)
|
||||
}
|
||||
if len(contents) == 0 {
|
||||
return nil, errors.New("no content provided")
|
||||
}
|
||||
d := dict{
|
||||
id: o.ID,
|
||||
litEnc: nil,
|
||||
llDec: sequenceDec{},
|
||||
ofDec: sequenceDec{},
|
||||
mlDec: sequenceDec{},
|
||||
offsets: o.Offsets,
|
||||
content: hist,
|
||||
}
|
||||
block := blockEnc{lowMem: false}
|
||||
block.init()
|
||||
enc := encoder(&bestFastEncoder{fastBase: fastBase{maxMatchOff: int32(maxMatchLen), bufferReset: math.MaxInt32 - int32(maxMatchLen*2), lowMem: false}})
|
||||
if o.Level != 0 {
|
||||
eOpts := encoderOptions{
|
||||
level: o.Level,
|
||||
blockSize: maxMatchLen,
|
||||
windowSize: maxMatchLen,
|
||||
dict: &d,
|
||||
lowMem: false,
|
||||
}
|
||||
enc = eOpts.encoder()
|
||||
} else {
|
||||
o.Level = SpeedBestCompression
|
||||
}
|
||||
var (
|
||||
remain [256]int
|
||||
ll [256]int
|
||||
ml [256]int
|
||||
of [256]int
|
||||
)
|
||||
addValues := func(dst *[256]int, src []byte) {
|
||||
for _, v := range src {
|
||||
dst[v]++
|
||||
}
|
||||
}
|
||||
addHist := func(dst *[256]int, src *[256]uint32) {
|
||||
for i, v := range src {
|
||||
dst[i] += int(v)
|
||||
}
|
||||
}
|
||||
seqs := 0
|
||||
nUsed := 0
|
||||
litTotal := 0
|
||||
newOffsets := make(map[uint32]int, 1000)
|
||||
for _, b := range contents {
|
||||
block.reset(nil)
|
||||
if len(b) < 8 {
|
||||
continue
|
||||
}
|
||||
nUsed++
|
||||
enc.Reset(&d, true)
|
||||
enc.Encode(&block, b)
|
||||
addValues(&remain, block.literals)
|
||||
litTotal += len(block.literals)
|
||||
seqs += len(block.sequences)
|
||||
block.genCodes()
|
||||
addHist(&ll, block.coders.llEnc.Histogram())
|
||||
addHist(&ml, block.coders.mlEnc.Histogram())
|
||||
addHist(&of, block.coders.ofEnc.Histogram())
|
||||
for i, seq := range block.sequences {
|
||||
if i > 3 {
|
||||
break
|
||||
}
|
||||
offset := seq.offset
|
||||
if offset == 0 {
|
||||
continue
|
||||
}
|
||||
if offset > 3 {
|
||||
newOffsets[offset-3]++
|
||||
} else {
|
||||
newOffsets[uint32(o.Offsets[offset-1])]++
|
||||
}
|
||||
}
|
||||
}
|
||||
// Find most used offsets.
|
||||
var sortedOffsets []uint32
|
||||
for k := range newOffsets {
|
||||
sortedOffsets = append(sortedOffsets, k)
|
||||
}
|
||||
sort.Slice(sortedOffsets, func(i, j int) bool {
|
||||
a, b := sortedOffsets[i], sortedOffsets[j]
|
||||
if a == b {
|
||||
// Prefer the longer offset
|
||||
return sortedOffsets[i] > sortedOffsets[j]
|
||||
}
|
||||
return newOffsets[sortedOffsets[i]] > newOffsets[sortedOffsets[j]]
|
||||
})
|
||||
if len(sortedOffsets) > 3 {
|
||||
if debug {
|
||||
print("Offsets:")
|
||||
for i, v := range sortedOffsets {
|
||||
if i > 20 {
|
||||
break
|
||||
}
|
||||
printf("[%d: %d],", v, newOffsets[v])
|
||||
}
|
||||
println("")
|
||||
}
|
||||
|
||||
sortedOffsets = sortedOffsets[:3]
|
||||
}
|
||||
for i, v := range sortedOffsets {
|
||||
o.Offsets[i] = int(v)
|
||||
}
|
||||
if debug {
|
||||
println("New repeat offsets", o.Offsets)
|
||||
}
|
||||
|
||||
if nUsed == 0 || seqs == 0 {
|
||||
return nil, fmt.Errorf("%d blocks, %d sequences found", nUsed, seqs)
|
||||
}
|
||||
if debug {
|
||||
println("Sequences:", seqs, "Blocks:", nUsed, "Literals:", litTotal)
|
||||
}
|
||||
if seqs/nUsed < 512 {
|
||||
// Use 512 as minimum.
|
||||
nUsed = seqs / 512
|
||||
}
|
||||
copyHist := func(dst *fseEncoder, src *[256]int) ([]byte, error) {
|
||||
hist := dst.Histogram()
|
||||
var maxSym uint8
|
||||
var maxCount int
|
||||
var fakeLength int
|
||||
for i, v := range src {
|
||||
if v > 0 {
|
||||
v = v / nUsed
|
||||
if v == 0 {
|
||||
v = 1
|
||||
}
|
||||
}
|
||||
if v > maxCount {
|
||||
maxCount = v
|
||||
}
|
||||
if v != 0 {
|
||||
maxSym = uint8(i)
|
||||
}
|
||||
fakeLength += v
|
||||
hist[i] = uint32(v)
|
||||
}
|
||||
dst.HistogramFinished(maxSym, maxCount)
|
||||
dst.reUsed = false
|
||||
dst.useRLE = false
|
||||
err := dst.normalizeCount(fakeLength)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if debug {
|
||||
println("RAW:", dst.count[:maxSym+1], "NORM:", dst.norm[:maxSym+1], "LEN:", fakeLength)
|
||||
}
|
||||
return dst.writeCount(nil)
|
||||
}
|
||||
if debug {
|
||||
print("Literal lengths: ")
|
||||
}
|
||||
llTable, err := copyHist(block.coders.llEnc, &ll)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if debug {
|
||||
print("Match lengths: ")
|
||||
}
|
||||
mlTable, err := copyHist(block.coders.mlEnc, &ml)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if debug {
|
||||
print("Offsets: ")
|
||||
}
|
||||
ofTable, err := copyHist(block.coders.ofEnc, &of)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Literal table
|
||||
avgSize := litTotal
|
||||
if avgSize > huff0.BlockSizeMax/2 {
|
||||
avgSize = huff0.BlockSizeMax / 2
|
||||
}
|
||||
huffBuff := make([]byte, 0, avgSize)
|
||||
// Target size
|
||||
div := litTotal / avgSize
|
||||
if div < 1 {
|
||||
div = 1
|
||||
}
|
||||
if debug {
|
||||
println("Huffman weights:")
|
||||
}
|
||||
for i, n := range remain[:] {
|
||||
if n > 0 {
|
||||
n = n / div
|
||||
// Allow all entries to be represented.
|
||||
if n == 0 {
|
||||
n = 1
|
||||
}
|
||||
huffBuff = append(huffBuff, bytes.Repeat([]byte{byte(i)}, n)...)
|
||||
if debug {
|
||||
printf("[%d: %d], ", i, n)
|
||||
}
|
||||
}
|
||||
}
|
||||
if o.CompatV155 && remain[255]/div == 0 {
|
||||
huffBuff = append(huffBuff, 255)
|
||||
}
|
||||
scratch := &huff0.Scratch{TableLog: 11}
|
||||
for tries := 0; tries < 255; tries++ {
|
||||
scratch = &huff0.Scratch{TableLog: 11}
|
||||
_, _, err = huff0.Compress1X(huffBuff, scratch)
|
||||
if err == nil {
|
||||
break
|
||||
}
|
||||
if debug {
|
||||
printf("Try %d: Huffman error: %v\n", tries+1, err)
|
||||
}
|
||||
huffBuff = huffBuff[:0]
|
||||
if tries == 250 {
|
||||
if debug {
|
||||
println("Huffman: Bailing out with predefined table")
|
||||
}
|
||||
|
||||
// Bail out.... Just generate something
|
||||
huffBuff = append(huffBuff, bytes.Repeat([]byte{255}, 10000)...)
|
||||
for i := 0; i < 128; i++ {
|
||||
huffBuff = append(huffBuff, byte(i))
|
||||
}
|
||||
continue
|
||||
}
|
||||
if errors.Is(err, huff0.ErrIncompressible) {
|
||||
// Try truncating least common.
|
||||
for i, n := range remain[:] {
|
||||
if n > 0 {
|
||||
n = n / (div * (i + 1))
|
||||
if n > 0 {
|
||||
huffBuff = append(huffBuff, bytes.Repeat([]byte{byte(i)}, n)...)
|
||||
}
|
||||
}
|
||||
}
|
||||
if o.CompatV155 && len(huffBuff) > 0 && huffBuff[len(huffBuff)-1] != 255 {
|
||||
huffBuff = append(huffBuff, 255)
|
||||
}
|
||||
if len(huffBuff) == 0 {
|
||||
huffBuff = append(huffBuff, 0, 255)
|
||||
}
|
||||
}
|
||||
if errors.Is(err, huff0.ErrUseRLE) {
|
||||
for i, n := range remain[:] {
|
||||
n = n / (div * (i + 1))
|
||||
// Allow all entries to be represented.
|
||||
if n == 0 {
|
||||
n = 1
|
||||
}
|
||||
huffBuff = append(huffBuff, bytes.Repeat([]byte{byte(i)}, n)...)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var out bytes.Buffer
|
||||
out.Write([]byte(dictMagic))
|
||||
out.Write(binary.LittleEndian.AppendUint32(nil, o.ID))
|
||||
out.Write(scratch.OutTable)
|
||||
if debug {
|
||||
println("huff table:", len(scratch.OutTable), "bytes")
|
||||
println("of table:", len(ofTable), "bytes")
|
||||
println("ml table:", len(mlTable), "bytes")
|
||||
println("ll table:", len(llTable), "bytes")
|
||||
}
|
||||
out.Write(ofTable)
|
||||
out.Write(mlTable)
|
||||
out.Write(llTable)
|
||||
out.Write(binary.LittleEndian.AppendUint32(nil, uint32(o.Offsets[0])))
|
||||
out.Write(binary.LittleEndian.AppendUint32(nil, uint32(o.Offsets[1])))
|
||||
out.Write(binary.LittleEndian.AppendUint32(nil, uint32(o.Offsets[2])))
|
||||
out.Write(hist)
|
||||
if debug {
|
||||
_, err := loadDict(out.Bytes())
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
i, err := InspectDictionary(out.Bytes())
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
println("ID:", i.ID())
|
||||
println("Content size:", i.ContentSize())
|
||||
println("Encoder:", i.LitEncoder() != nil)
|
||||
println("Offsets:", i.Offsets())
|
||||
var totalSize int
|
||||
for _, b := range contents {
|
||||
totalSize += len(b)
|
||||
}
|
||||
|
||||
encWith := func(opts ...EOption) int {
|
||||
enc, err := NewWriter(nil, opts...)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer enc.Close()
|
||||
var dst []byte
|
||||
var totalSize int
|
||||
for _, b := range contents {
|
||||
dst = enc.EncodeAll(b, dst[:0])
|
||||
totalSize += len(dst)
|
||||
}
|
||||
return totalSize
|
||||
}
|
||||
plain := encWith(WithEncoderLevel(o.Level))
|
||||
withDict := encWith(WithEncoderLevel(o.Level), WithEncoderDict(out.Bytes()))
|
||||
println("Input size:", totalSize)
|
||||
println("Plain Compressed:", plain)
|
||||
println("Dict Compressed:", withDict)
|
||||
println("Saved:", plain-withDict, (plain-withDict)/len(contents), "bytes per input (rounded down)")
|
||||
}
|
||||
return out.Bytes(), nil
|
||||
}
|
||||
|
|
|
|||
|
|
@ -144,6 +144,7 @@ func (e *fastBase) resetBase(d *dict, singleBlock bool) {
|
|||
} else {
|
||||
e.crc.Reset()
|
||||
}
|
||||
e.blk.dictLitEnc = nil
|
||||
if d != nil {
|
||||
low := e.lowMem
|
||||
if singleBlock {
|
||||
|
|
|
|||
|
|
@ -34,7 +34,7 @@ type match struct {
|
|||
est int32
|
||||
}
|
||||
|
||||
const highScore = 25000
|
||||
const highScore = maxMatchLen * 8
|
||||
|
||||
// estBits will estimate output bits from predefined tables.
|
||||
func (m *match) estBits(bitsPerByte int32) {
|
||||
|
|
@ -159,7 +159,6 @@ func (e *bestFastEncoder) Encode(blk *blockEnc, src []byte) {
|
|||
|
||||
// nextEmit is where in src the next emitLiteral should start from.
|
||||
nextEmit := s
|
||||
cv := load6432(src, s)
|
||||
|
||||
// Relative offsets
|
||||
offset1 := int32(blk.recentOffsets[0])
|
||||
|
|
@ -173,7 +172,6 @@ func (e *bestFastEncoder) Encode(blk *blockEnc, src []byte) {
|
|||
blk.literals = append(blk.literals, src[nextEmit:until]...)
|
||||
s.litLen = uint32(until - nextEmit)
|
||||
}
|
||||
_ = addLiterals
|
||||
|
||||
if debugEncoder {
|
||||
println("recent offsets:", blk.recentOffsets)
|
||||
|
|
@ -188,7 +186,9 @@ encodeLoop:
|
|||
panic("offset0 was 0")
|
||||
}
|
||||
|
||||
const goodEnough = 100
|
||||
const goodEnough = 250
|
||||
|
||||
cv := load6432(src, s)
|
||||
|
||||
nextHashL := hashLen(cv, bestLongTableBits, bestLongLen)
|
||||
nextHashS := hashLen(cv, bestShortTableBits, bestShortLen)
|
||||
|
|
@ -197,15 +197,50 @@ encodeLoop:
|
|||
|
||||
// Set m to a match at offset if it looks like that will improve compression.
|
||||
improve := func(m *match, offset int32, s int32, first uint32, rep int32) {
|
||||
if s-offset >= e.maxMatchOff || load3232(src, offset) != first {
|
||||
delta := s - offset
|
||||
if delta >= e.maxMatchOff || delta <= 0 || load3232(src, offset) != first {
|
||||
return
|
||||
}
|
||||
if debugAsserts {
|
||||
if offset >= s {
|
||||
panic(fmt.Sprintf("offset: %d - s:%d - rep: %d - cur :%d - max: %d", offset, s, rep, e.cur, e.maxMatchOff))
|
||||
}
|
||||
if !bytes.Equal(src[s:s+4], src[offset:offset+4]) {
|
||||
panic(fmt.Sprintf("first match mismatch: %v != %v, first: %08x", src[s:s+4], src[offset:offset+4], first))
|
||||
}
|
||||
}
|
||||
cand := match{offset: offset, s: s, length: 4 + e.matchlen(s+4, offset+4, src), rep: rep}
|
||||
// Try to quick reject if we already have a long match.
|
||||
if m.length > 16 {
|
||||
left := len(src) - int(m.s+m.length)
|
||||
// If we are too close to the end, keep as is.
|
||||
if left <= 0 {
|
||||
return
|
||||
}
|
||||
checkLen := m.length - (s - m.s) - 8
|
||||
if left > 2 && checkLen > 4 {
|
||||
// Check 4 bytes, 4 bytes from the end of the current match.
|
||||
a := load3232(src, offset+checkLen)
|
||||
b := load3232(src, s+checkLen)
|
||||
if a != b {
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
l := 4 + e.matchlen(s+4, offset+4, src)
|
||||
if rep < 0 {
|
||||
// Extend candidate match backwards as far as possible.
|
||||
tMin := s - e.maxMatchOff
|
||||
if tMin < 0 {
|
||||
tMin = 0
|
||||
}
|
||||
for offset > tMin && s > nextEmit && src[offset-1] == src[s-1] && l < maxMatchLength {
|
||||
s--
|
||||
offset--
|
||||
l++
|
||||
}
|
||||
}
|
||||
|
||||
cand := match{offset: offset, s: s, length: l, rep: rep}
|
||||
cand.estBits(bitsPerByte)
|
||||
if m.est >= highScore || cand.est-m.est+(cand.s-m.s)*bitsPerByte>>10 < 0 {
|
||||
*m = cand
|
||||
|
|
@ -219,17 +254,29 @@ encodeLoop:
|
|||
improve(&best, candidateS.prev-e.cur, s, uint32(cv), -1)
|
||||
|
||||
if canRepeat && best.length < goodEnough {
|
||||
cv32 := uint32(cv >> 8)
|
||||
spp := s + 1
|
||||
improve(&best, spp-offset1, spp, cv32, 1)
|
||||
improve(&best, spp-offset2, spp, cv32, 2)
|
||||
improve(&best, spp-offset3, spp, cv32, 3)
|
||||
if best.length > 0 {
|
||||
cv32 = uint32(cv >> 24)
|
||||
spp += 2
|
||||
if s == nextEmit {
|
||||
// Check repeats straight after a match.
|
||||
improve(&best, s-offset2, s, uint32(cv), 1|4)
|
||||
improve(&best, s-offset3, s, uint32(cv), 2|4)
|
||||
if offset1 > 1 {
|
||||
improve(&best, s-(offset1-1), s, uint32(cv), 3|4)
|
||||
}
|
||||
}
|
||||
|
||||
// If either no match or a non-repeat match, check at + 1
|
||||
if best.rep <= 0 {
|
||||
cv32 := uint32(cv >> 8)
|
||||
spp := s + 1
|
||||
improve(&best, spp-offset1, spp, cv32, 1)
|
||||
improve(&best, spp-offset2, spp, cv32, 2)
|
||||
improve(&best, spp-offset3, spp, cv32, 3)
|
||||
if best.rep < 0 {
|
||||
cv32 = uint32(cv >> 24)
|
||||
spp += 2
|
||||
improve(&best, spp-offset1, spp, cv32, 1)
|
||||
improve(&best, spp-offset2, spp, cv32, 2)
|
||||
improve(&best, spp-offset3, spp, cv32, 3)
|
||||
}
|
||||
}
|
||||
}
|
||||
// Load next and check...
|
||||
|
|
@ -244,41 +291,44 @@ encodeLoop:
|
|||
if s >= sLimit {
|
||||
break encodeLoop
|
||||
}
|
||||
cv = load6432(src, s)
|
||||
continue
|
||||
}
|
||||
|
||||
s++
|
||||
candidateS = e.table[hashLen(cv>>8, bestShortTableBits, bestShortLen)]
|
||||
cv = load6432(src, s)
|
||||
cv2 := load6432(src, s+1)
|
||||
cv = load6432(src, s+1)
|
||||
cv2 := load6432(src, s+2)
|
||||
candidateL = e.longTable[hashLen(cv, bestLongTableBits, bestLongLen)]
|
||||
candidateL2 := e.longTable[hashLen(cv2, bestLongTableBits, bestLongLen)]
|
||||
|
||||
// Short at s+1
|
||||
improve(&best, candidateS.offset-e.cur, s, uint32(cv), -1)
|
||||
improve(&best, candidateS.offset-e.cur, s+1, uint32(cv), -1)
|
||||
// Long at s+1, s+2
|
||||
improve(&best, candidateL.offset-e.cur, s, uint32(cv), -1)
|
||||
improve(&best, candidateL.prev-e.cur, s, uint32(cv), -1)
|
||||
improve(&best, candidateL2.offset-e.cur, s+1, uint32(cv2), -1)
|
||||
improve(&best, candidateL2.prev-e.cur, s+1, uint32(cv2), -1)
|
||||
improve(&best, candidateL.offset-e.cur, s+1, uint32(cv), -1)
|
||||
improve(&best, candidateL.prev-e.cur, s+1, uint32(cv), -1)
|
||||
improve(&best, candidateL2.offset-e.cur, s+2, uint32(cv2), -1)
|
||||
improve(&best, candidateL2.prev-e.cur, s+2, uint32(cv2), -1)
|
||||
if false {
|
||||
// Short at s+3.
|
||||
// Too often worse...
|
||||
improve(&best, e.table[hashLen(cv2>>8, bestShortTableBits, bestShortLen)].offset-e.cur, s+2, uint32(cv2>>8), -1)
|
||||
improve(&best, e.table[hashLen(cv2>>8, bestShortTableBits, bestShortLen)].offset-e.cur, s+3, uint32(cv2>>8), -1)
|
||||
}
|
||||
// See if we can find a better match by checking where the current best ends.
|
||||
// Use that offset to see if we can find a better full match.
|
||||
if sAt := best.s + best.length; sAt < sLimit {
|
||||
nextHashL := hashLen(load6432(src, sAt), bestLongTableBits, bestLongLen)
|
||||
candidateEnd := e.longTable[nextHashL]
|
||||
// Start check at a fixed offset to allow for a few mismatches.
|
||||
// For this compression level 2 yields the best results.
|
||||
const skipBeginning = 2
|
||||
if pos := candidateEnd.offset - e.cur - best.length + skipBeginning; pos >= 0 {
|
||||
improve(&best, pos, best.s+skipBeginning, load3232(src, best.s+skipBeginning), -1)
|
||||
if pos := candidateEnd.prev - e.cur - best.length + skipBeginning; pos >= 0 {
|
||||
improve(&best, pos, best.s+skipBeginning, load3232(src, best.s+skipBeginning), -1)
|
||||
|
||||
// Start check at a fixed offset to allow for a few mismatches.
|
||||
// For this compression level 2 yields the best results.
|
||||
// We cannot do this if we have already indexed this position.
|
||||
const skipBeginning = 2
|
||||
if best.s > s-skipBeginning {
|
||||
// See if we can find a better match by checking where the current best ends.
|
||||
// Use that offset to see if we can find a better full match.
|
||||
if sAt := best.s + best.length; sAt < sLimit {
|
||||
nextHashL := hashLen(load6432(src, sAt), bestLongTableBits, bestLongLen)
|
||||
candidateEnd := e.longTable[nextHashL]
|
||||
|
||||
if off := candidateEnd.offset - e.cur - best.length + skipBeginning; off >= 0 {
|
||||
improve(&best, off, best.s+skipBeginning, load3232(src, best.s+skipBeginning), -1)
|
||||
if off := candidateEnd.prev - e.cur - best.length + skipBeginning; off >= 0 {
|
||||
improve(&best, off, best.s+skipBeginning, load3232(src, best.s+skipBeginning), -1)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -292,51 +342,34 @@ encodeLoop:
|
|||
|
||||
// We have a match, we can store the forward value
|
||||
if best.rep > 0 {
|
||||
s = best.s
|
||||
var seq seq
|
||||
seq.matchLen = uint32(best.length - zstdMinMatch)
|
||||
|
||||
// We might be able to match backwards.
|
||||
// Extend as long as we can.
|
||||
start := best.s
|
||||
// We end the search early, so we don't risk 0 literals
|
||||
// and have to do special offset treatment.
|
||||
startLimit := nextEmit + 1
|
||||
|
||||
tMin := s - e.maxMatchOff
|
||||
if tMin < 0 {
|
||||
tMin = 0
|
||||
if debugAsserts && s < nextEmit {
|
||||
panic("s < nextEmit")
|
||||
}
|
||||
repIndex := best.offset
|
||||
for repIndex > tMin && start > startLimit && src[repIndex-1] == src[start-1] && seq.matchLen < maxMatchLength-zstdMinMatch-1 {
|
||||
repIndex--
|
||||
start--
|
||||
seq.matchLen++
|
||||
}
|
||||
addLiterals(&seq, start)
|
||||
addLiterals(&seq, best.s)
|
||||
|
||||
// rep 0
|
||||
seq.offset = uint32(best.rep)
|
||||
// Repeat. If bit 4 is set, this is a non-lit repeat.
|
||||
seq.offset = uint32(best.rep & 3)
|
||||
if debugSequences {
|
||||
println("repeat sequence", seq, "next s:", s)
|
||||
}
|
||||
blk.sequences = append(blk.sequences, seq)
|
||||
|
||||
// Index match start+1 (long) -> s - 1
|
||||
index0 := s
|
||||
// Index old s + 1 -> s - 1
|
||||
index0 := s + 1
|
||||
s = best.s + best.length
|
||||
|
||||
nextEmit = s
|
||||
if s >= sLimit {
|
||||
if debugEncoder {
|
||||
println("repeat ended", s, best.length)
|
||||
|
||||
}
|
||||
break encodeLoop
|
||||
}
|
||||
// Index skipped...
|
||||
off := index0 + e.cur
|
||||
for index0 < s-1 {
|
||||
for index0 < s {
|
||||
cv0 := load6432(src, index0)
|
||||
h0 := hashLen(cv0, bestLongTableBits, bestLongLen)
|
||||
h1 := hashLen(cv0, bestShortTableBits, bestShortLen)
|
||||
|
|
@ -346,17 +379,19 @@ encodeLoop:
|
|||
index0++
|
||||
}
|
||||
switch best.rep {
|
||||
case 2:
|
||||
case 2, 4 | 1:
|
||||
offset1, offset2 = offset2, offset1
|
||||
case 3:
|
||||
case 3, 4 | 2:
|
||||
offset1, offset2, offset3 = offset3, offset1, offset2
|
||||
case 4 | 3:
|
||||
offset1, offset2, offset3 = offset1-1, offset1, offset2
|
||||
}
|
||||
cv = load6432(src, s)
|
||||
continue
|
||||
}
|
||||
|
||||
// A 4-byte match has been found. Update recent offsets.
|
||||
// We'll later see if more than 4 bytes.
|
||||
index0 := s + 1
|
||||
s = best.s
|
||||
t := best.offset
|
||||
offset1, offset2, offset3 = s-t, offset1, offset2
|
||||
|
|
@ -369,22 +404,9 @@ encodeLoop:
|
|||
panic("invalid offset")
|
||||
}
|
||||
|
||||
// Extend the n-byte match as long as possible.
|
||||
l := best.length
|
||||
|
||||
// Extend backwards
|
||||
tMin := s - e.maxMatchOff
|
||||
if tMin < 0 {
|
||||
tMin = 0
|
||||
}
|
||||
for t > tMin && s > nextEmit && src[t-1] == src[s-1] && l < maxMatchLength {
|
||||
s--
|
||||
t--
|
||||
l++
|
||||
}
|
||||
|
||||
// Write our sequence
|
||||
var seq seq
|
||||
l := best.length
|
||||
seq.litLen = uint32(s - nextEmit)
|
||||
seq.matchLen = uint32(l - zstdMinMatch)
|
||||
if seq.litLen > 0 {
|
||||
|
|
@ -401,10 +423,8 @@ encodeLoop:
|
|||
break encodeLoop
|
||||
}
|
||||
|
||||
// Index match start+1 (long) -> s - 1
|
||||
index0 := s - l + 1
|
||||
// every entry
|
||||
for index0 < s-1 {
|
||||
// Index old s + 1 -> s - 1
|
||||
for index0 < s {
|
||||
cv0 := load6432(src, index0)
|
||||
h0 := hashLen(cv0, bestLongTableBits, bestLongLen)
|
||||
h1 := hashLen(cv0, bestShortTableBits, bestShortLen)
|
||||
|
|
@ -413,50 +433,6 @@ encodeLoop:
|
|||
e.table[h1] = prevEntry{offset: off, prev: e.table[h1].offset}
|
||||
index0++
|
||||
}
|
||||
|
||||
cv = load6432(src, s)
|
||||
if !canRepeat {
|
||||
continue
|
||||
}
|
||||
|
||||
// Check offset 2
|
||||
for {
|
||||
o2 := s - offset2
|
||||
if load3232(src, o2) != uint32(cv) {
|
||||
// Do regular search
|
||||
break
|
||||
}
|
||||
|
||||
// Store this, since we have it.
|
||||
nextHashS := hashLen(cv, bestShortTableBits, bestShortLen)
|
||||
nextHashL := hashLen(cv, bestLongTableBits, bestLongLen)
|
||||
|
||||
// We have at least 4 byte match.
|
||||
// No need to check backwards. We come straight from a match
|
||||
l := 4 + e.matchlen(s+4, o2+4, src)
|
||||
|
||||
e.longTable[nextHashL] = prevEntry{offset: s + e.cur, prev: e.longTable[nextHashL].offset}
|
||||
e.table[nextHashS] = prevEntry{offset: s + e.cur, prev: e.table[nextHashS].offset}
|
||||
seq.matchLen = uint32(l) - zstdMinMatch
|
||||
seq.litLen = 0
|
||||
|
||||
// Since litlen is always 0, this is offset 1.
|
||||
seq.offset = 1
|
||||
s += l
|
||||
nextEmit = s
|
||||
if debugSequences {
|
||||
println("sequence", seq, "next s:", s)
|
||||
}
|
||||
blk.sequences = append(blk.sequences, seq)
|
||||
|
||||
// Swap offset 1 and 2.
|
||||
offset1, offset2 = offset2, offset1
|
||||
if s >= sLimit {
|
||||
// Finished
|
||||
break encodeLoop
|
||||
}
|
||||
cv = load6432(src, s)
|
||||
}
|
||||
}
|
||||
|
||||
if int(nextEmit) < len(src) {
|
||||
|
|
|
|||
|
|
@ -1084,7 +1084,7 @@ func (e *doubleFastEncoderDict) Reset(d *dict, singleBlock bool) {
|
|||
}
|
||||
}
|
||||
e.lastDictID = d.id
|
||||
e.allDirty = true
|
||||
allDirty = true
|
||||
}
|
||||
// Reset table to initial state
|
||||
e.cur = e.maxMatchOff
|
||||
|
|
|
|||
|
|
@ -133,8 +133,7 @@ encodeLoop:
|
|||
if canRepeat && repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>16) {
|
||||
// Consider history as well.
|
||||
var seq seq
|
||||
var length int32
|
||||
length = 4 + e.matchlen(s+6, repIndex+4, src)
|
||||
length := 4 + e.matchlen(s+6, repIndex+4, src)
|
||||
seq.matchLen = uint32(length - zstdMinMatch)
|
||||
|
||||
// We might be able to match backwards.
|
||||
|
|
@ -645,8 +644,7 @@ encodeLoop:
|
|||
if canRepeat && repIndex >= 0 && load3232(src, repIndex) == uint32(cv>>16) {
|
||||
// Consider history as well.
|
||||
var seq seq
|
||||
var length int32
|
||||
length = 4 + e.matchlen(s+6, repIndex+4, src)
|
||||
length := 4 + e.matchlen(s+6, repIndex+4, src)
|
||||
|
||||
seq.matchLen = uint32(length - zstdMinMatch)
|
||||
|
||||
|
|
@ -831,13 +829,12 @@ func (e *fastEncoderDict) Reset(d *dict, singleBlock bool) {
|
|||
}
|
||||
if true {
|
||||
end := e.maxMatchOff + int32(len(d.content)) - 8
|
||||
for i := e.maxMatchOff; i < end; i += 3 {
|
||||
for i := e.maxMatchOff; i < end; i += 2 {
|
||||
const hashLog = tableBits
|
||||
|
||||
cv := load6432(d.content, i-e.maxMatchOff)
|
||||
nextHash := hashLen(cv, hashLog, tableFastHashLen) // 0 -> 5
|
||||
nextHash1 := hashLen(cv>>8, hashLog, tableFastHashLen) // 1 -> 6
|
||||
nextHash2 := hashLen(cv>>16, hashLog, tableFastHashLen) // 2 -> 7
|
||||
nextHash := hashLen(cv, hashLog, tableFastHashLen) // 0 -> 6
|
||||
nextHash1 := hashLen(cv>>8, hashLog, tableFastHashLen) // 1 -> 7
|
||||
e.dictTable[nextHash] = tableEntry{
|
||||
val: uint32(cv),
|
||||
offset: i,
|
||||
|
|
@ -846,10 +843,6 @@ func (e *fastEncoderDict) Reset(d *dict, singleBlock bool) {
|
|||
val: uint32(cv >> 8),
|
||||
offset: i + 1,
|
||||
}
|
||||
e.dictTable[nextHash2] = tableEntry{
|
||||
val: uint32(cv >> 16),
|
||||
offset: i + 2,
|
||||
}
|
||||
}
|
||||
}
|
||||
e.lastDictID = d.id
|
||||
|
|
|
|||
|
|
@ -227,10 +227,7 @@ func (e *Encoder) nextBlock(final bool) error {
|
|||
DictID: e.o.dict.ID(),
|
||||
}
|
||||
|
||||
dst, err := fh.appendTo(tmp[:0])
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
dst := fh.appendTo(tmp[:0])
|
||||
s.headerWritten = true
|
||||
s.wWg.Wait()
|
||||
var n2 int
|
||||
|
|
@ -277,23 +274,9 @@ func (e *Encoder) nextBlock(final bool) error {
|
|||
s.eofWritten = true
|
||||
}
|
||||
|
||||
err := errIncompressible
|
||||
// If we got the exact same number of literals as input,
|
||||
// assume the literals cannot be compressed.
|
||||
if len(src) != len(blk.literals) || len(src) != e.o.blockSize {
|
||||
err = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
}
|
||||
switch err {
|
||||
case errIncompressible:
|
||||
if debugEncoder {
|
||||
println("Storing incompressible block as raw")
|
||||
}
|
||||
blk.encodeRaw(src)
|
||||
// In fast mode, we do not transfer offsets, so we don't have to deal with changing the.
|
||||
case nil:
|
||||
default:
|
||||
s.err = err
|
||||
return err
|
||||
s.err = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
if s.err != nil {
|
||||
return s.err
|
||||
}
|
||||
_, s.err = s.w.Write(blk.output)
|
||||
s.nWritten += int64(len(blk.output))
|
||||
|
|
@ -343,22 +326,8 @@ func (e *Encoder) nextBlock(final bool) error {
|
|||
}
|
||||
s.wWg.Done()
|
||||
}()
|
||||
err := errIncompressible
|
||||
// If we got the exact same number of literals as input,
|
||||
// assume the literals cannot be compressed.
|
||||
if len(src) != len(blk.literals) || len(src) != e.o.blockSize {
|
||||
err = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
}
|
||||
switch err {
|
||||
case errIncompressible:
|
||||
if debugEncoder {
|
||||
println("Storing incompressible block as raw")
|
||||
}
|
||||
blk.encodeRaw(src)
|
||||
// In fast mode, we do not transfer offsets, so we don't have to deal with changing the.
|
||||
case nil:
|
||||
default:
|
||||
s.writeErr = err
|
||||
s.writeErr = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
if s.writeErr != nil {
|
||||
return
|
||||
}
|
||||
_, s.writeErr = s.w.Write(blk.output)
|
||||
|
|
@ -511,7 +480,7 @@ func (e *Encoder) EncodeAll(src, dst []byte) []byte {
|
|||
Checksum: false,
|
||||
DictID: 0,
|
||||
}
|
||||
dst, _ = fh.appendTo(dst)
|
||||
dst = fh.appendTo(dst)
|
||||
|
||||
// Write raw block as last one only.
|
||||
var blk blockHeader
|
||||
|
|
@ -546,10 +515,7 @@ func (e *Encoder) EncodeAll(src, dst []byte) []byte {
|
|||
if len(dst) == 0 && cap(dst) == 0 && len(src) < 1<<20 && !e.o.lowMem {
|
||||
dst = make([]byte, 0, len(src))
|
||||
}
|
||||
dst, err := fh.appendTo(dst)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
dst = fh.appendTo(dst)
|
||||
|
||||
// If we can do everything in one block, prefer that.
|
||||
if len(src) <= e.o.blockSize {
|
||||
|
|
@ -568,25 +534,15 @@ func (e *Encoder) EncodeAll(src, dst []byte) []byte {
|
|||
|
||||
// If we got the exact same number of literals as input,
|
||||
// assume the literals cannot be compressed.
|
||||
err := errIncompressible
|
||||
oldout := blk.output
|
||||
if len(blk.literals) != len(src) || len(src) != e.o.blockSize {
|
||||
// Output directly to dst
|
||||
blk.output = dst
|
||||
err = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
}
|
||||
// Output directly to dst
|
||||
blk.output = dst
|
||||
|
||||
switch err {
|
||||
case errIncompressible:
|
||||
if debugEncoder {
|
||||
println("Storing incompressible block as raw")
|
||||
}
|
||||
dst = blk.encodeRawTo(dst, src)
|
||||
case nil:
|
||||
dst = blk.output
|
||||
default:
|
||||
err := blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
dst = blk.output
|
||||
blk.output = oldout
|
||||
} else {
|
||||
enc.Reset(e.o.dict, false)
|
||||
|
|
@ -605,25 +561,11 @@ func (e *Encoder) EncodeAll(src, dst []byte) []byte {
|
|||
if len(src) == 0 {
|
||||
blk.last = true
|
||||
}
|
||||
err := errIncompressible
|
||||
// If we got the exact same number of literals as input,
|
||||
// assume the literals cannot be compressed.
|
||||
if len(blk.literals) != len(todo) || len(todo) != e.o.blockSize {
|
||||
err = blk.encode(todo, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
}
|
||||
|
||||
switch err {
|
||||
case errIncompressible:
|
||||
if debugEncoder {
|
||||
println("Storing incompressible block as raw")
|
||||
}
|
||||
dst = blk.encodeRawTo(dst, todo)
|
||||
blk.popOffsets()
|
||||
case nil:
|
||||
dst = append(dst, blk.output...)
|
||||
default:
|
||||
err := blk.encode(todo, e.o.noEntropy, !e.o.allLitEntropy)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
dst = append(dst, blk.output...)
|
||||
blk.reset(nil)
|
||||
}
|
||||
}
|
||||
|
|
@ -633,6 +575,7 @@ func (e *Encoder) EncodeAll(src, dst []byte) []byte {
|
|||
// Add padding with content from crypto/rand.Reader
|
||||
if e.o.pad > 0 {
|
||||
add := calcSkippableFrame(int64(len(dst)), int64(e.o.pad))
|
||||
var err error
|
||||
dst, err = skippableFrame(dst, add, rand.Reader)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
|
|
|
|||
|
|
@ -39,7 +39,7 @@ func (o *encoderOptions) setDefault() {
|
|||
blockSize: maxCompressedBlockSize,
|
||||
windowSize: 8 << 20,
|
||||
level: SpeedDefault,
|
||||
allLitEntropy: true,
|
||||
allLitEntropy: false,
|
||||
lowMem: false,
|
||||
}
|
||||
}
|
||||
|
|
@ -129,7 +129,7 @@ func WithEncoderPadding(n int) EOption {
|
|||
}
|
||||
// No need to waste our time.
|
||||
if n == 1 {
|
||||
o.pad = 0
|
||||
n = 0
|
||||
}
|
||||
if n > 1<<30 {
|
||||
return fmt.Errorf("padding must less than 1GB (1<<30 bytes) ")
|
||||
|
|
@ -238,7 +238,7 @@ func WithEncoderLevel(l EncoderLevel) EOption {
|
|||
}
|
||||
}
|
||||
if !o.customALEntropy {
|
||||
o.allLitEntropy = l > SpeedFastest
|
||||
o.allLitEntropy = l > SpeedDefault
|
||||
}
|
||||
|
||||
return nil
|
||||
|
|
|
|||
|
|
@ -73,20 +73,20 @@ func (d *frameDec) reset(br byteBuffer) error {
|
|||
switch err {
|
||||
case io.EOF, io.ErrUnexpectedEOF:
|
||||
return io.EOF
|
||||
default:
|
||||
return err
|
||||
case nil:
|
||||
signature[0] = b[0]
|
||||
default:
|
||||
return err
|
||||
}
|
||||
// Read the rest, don't allow io.ErrUnexpectedEOF
|
||||
b, err = br.readSmall(3)
|
||||
switch err {
|
||||
case io.EOF:
|
||||
return io.EOF
|
||||
default:
|
||||
return err
|
||||
case nil:
|
||||
copy(signature[1:], b)
|
||||
default:
|
||||
return err
|
||||
}
|
||||
|
||||
if string(signature[1:4]) != skippableFrameMagic || signature[0]&0xf0 != 0x50 {
|
||||
|
|
@ -293,13 +293,9 @@ func (d *frameDec) next(block *blockDec) error {
|
|||
return nil
|
||||
}
|
||||
|
||||
// checkCRC will check the checksum if the frame has one.
|
||||
// checkCRC will check the checksum, assuming the frame has one.
|
||||
// Will return ErrCRCMismatch if crc check failed, otherwise nil.
|
||||
func (d *frameDec) checkCRC() error {
|
||||
if !d.HasCheckSum {
|
||||
return nil
|
||||
}
|
||||
|
||||
// We can overwrite upper tmp now
|
||||
buf, err := d.rawInput.readSmall(4)
|
||||
if err != nil {
|
||||
|
|
@ -307,10 +303,6 @@ func (d *frameDec) checkCRC() error {
|
|||
return err
|
||||
}
|
||||
|
||||
if d.o.ignoreChecksum {
|
||||
return nil
|
||||
}
|
||||
|
||||
want := binary.LittleEndian.Uint32(buf[:4])
|
||||
got := uint32(d.crc.Sum64())
|
||||
|
||||
|
|
@ -326,17 +318,13 @@ func (d *frameDec) checkCRC() error {
|
|||
return nil
|
||||
}
|
||||
|
||||
// consumeCRC reads the checksum data if the frame has one.
|
||||
// consumeCRC skips over the checksum, assuming the frame has one.
|
||||
func (d *frameDec) consumeCRC() error {
|
||||
if d.HasCheckSum {
|
||||
_, err := d.rawInput.readSmall(4)
|
||||
if err != nil {
|
||||
println("CRC missing?", err)
|
||||
return err
|
||||
}
|
||||
_, err := d.rawInput.readSmall(4)
|
||||
if err != nil {
|
||||
println("CRC missing?", err)
|
||||
}
|
||||
|
||||
return nil
|
||||
return err
|
||||
}
|
||||
|
||||
// runDecoder will run the decoder for the remainder of the frame.
|
||||
|
|
@ -415,15 +403,8 @@ func (d *frameDec) runDecoder(dst []byte, dec *blockDec) ([]byte, error) {
|
|||
if d.o.ignoreChecksum {
|
||||
err = d.consumeCRC()
|
||||
} else {
|
||||
var n int
|
||||
n, err = d.crc.Write(dst[crcStart:])
|
||||
if err == nil {
|
||||
if n != len(dst)-crcStart {
|
||||
err = io.ErrShortWrite
|
||||
} else {
|
||||
err = d.checkCRC()
|
||||
}
|
||||
}
|
||||
d.crc.Write(dst[crcStart:])
|
||||
err = d.checkCRC()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -22,7 +22,7 @@ type frameHeader struct {
|
|||
|
||||
const maxHeaderSize = 14
|
||||
|
||||
func (f frameHeader) appendTo(dst []byte) ([]byte, error) {
|
||||
func (f frameHeader) appendTo(dst []byte) []byte {
|
||||
dst = append(dst, frameMagic...)
|
||||
var fhd uint8
|
||||
if f.Checksum {
|
||||
|
|
@ -88,7 +88,7 @@ func (f frameHeader) appendTo(dst []byte) ([]byte, error) {
|
|||
default:
|
||||
panic("invalid fcs")
|
||||
}
|
||||
return dst, nil
|
||||
return dst
|
||||
}
|
||||
|
||||
const skippableFrameHeader = 4 + 4
|
||||
|
|
|
|||
|
|
@ -0,0 +1,16 @@
|
|||
//go:build amd64 && !appengine && !noasm && gc
|
||||
// +build amd64,!appengine,!noasm,gc
|
||||
|
||||
// Copyright 2019+ Klaus Post. All rights reserved.
|
||||
// License information can be found in the LICENSE file.
|
||||
|
||||
package zstd
|
||||
|
||||
// matchLen returns how many bytes match in a and b
|
||||
//
|
||||
// It assumes that:
|
||||
//
|
||||
// len(a) <= len(b) and len(a) > 0
|
||||
//
|
||||
//go:noescape
|
||||
func matchLen(a []byte, b []byte) int
|
||||
|
|
@ -0,0 +1,68 @@
|
|||
// Copied from S2 implementation.
|
||||
|
||||
//go:build !appengine && !noasm && gc && !noasm
|
||||
|
||||
#include "textflag.h"
|
||||
|
||||
// func matchLen(a []byte, b []byte) int
|
||||
// Requires: BMI
|
||||
TEXT ·matchLen(SB), NOSPLIT, $0-56
|
||||
MOVQ a_base+0(FP), AX
|
||||
MOVQ b_base+24(FP), CX
|
||||
MOVQ a_len+8(FP), DX
|
||||
|
||||
// matchLen
|
||||
XORL SI, SI
|
||||
CMPL DX, $0x08
|
||||
JB matchlen_match4_standalone
|
||||
|
||||
matchlen_loopback_standalone:
|
||||
MOVQ (AX)(SI*1), BX
|
||||
XORQ (CX)(SI*1), BX
|
||||
TESTQ BX, BX
|
||||
JZ matchlen_loop_standalone
|
||||
|
||||
#ifdef GOAMD64_v3
|
||||
TZCNTQ BX, BX
|
||||
#else
|
||||
BSFQ BX, BX
|
||||
#endif
|
||||
SARQ $0x03, BX
|
||||
LEAL (SI)(BX*1), SI
|
||||
JMP gen_match_len_end
|
||||
|
||||
matchlen_loop_standalone:
|
||||
LEAL -8(DX), DX
|
||||
LEAL 8(SI), SI
|
||||
CMPL DX, $0x08
|
||||
JAE matchlen_loopback_standalone
|
||||
|
||||
matchlen_match4_standalone:
|
||||
CMPL DX, $0x04
|
||||
JB matchlen_match2_standalone
|
||||
MOVL (AX)(SI*1), BX
|
||||
CMPL (CX)(SI*1), BX
|
||||
JNE matchlen_match2_standalone
|
||||
LEAL -4(DX), DX
|
||||
LEAL 4(SI), SI
|
||||
|
||||
matchlen_match2_standalone:
|
||||
CMPL DX, $0x02
|
||||
JB matchlen_match1_standalone
|
||||
MOVW (AX)(SI*1), BX
|
||||
CMPW (CX)(SI*1), BX
|
||||
JNE matchlen_match1_standalone
|
||||
LEAL -2(DX), DX
|
||||
LEAL 2(SI), SI
|
||||
|
||||
matchlen_match1_standalone:
|
||||
CMPL DX, $0x01
|
||||
JB gen_match_len_end
|
||||
MOVB (AX)(SI*1), BL
|
||||
CMPB (CX)(SI*1), BL
|
||||
JNE gen_match_len_end
|
||||
INCL SI
|
||||
|
||||
gen_match_len_end:
|
||||
MOVQ SI, ret+48(FP)
|
||||
RET
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
//go:build !amd64 || appengine || !gc || noasm
|
||||
// +build !amd64 appengine !gc noasm
|
||||
|
||||
// Copyright 2019+ Klaus Post. All rights reserved.
|
||||
// License information can be found in the LICENSE file.
|
||||
|
||||
package zstd
|
||||
|
||||
import (
|
||||
"encoding/binary"
|
||||
"math/bits"
|
||||
)
|
||||
|
||||
// matchLen returns the maximum common prefix length of a and b.
|
||||
// a must be the shortest of the two.
|
||||
func matchLen(a, b []byte) (n int) {
|
||||
for ; len(a) >= 8 && len(b) >= 8; a, b = a[8:], b[8:] {
|
||||
diff := binary.LittleEndian.Uint64(a) ^ binary.LittleEndian.Uint64(b)
|
||||
if diff != 0 {
|
||||
return n + bits.TrailingZeros64(diff)>>3
|
||||
}
|
||||
n += 8
|
||||
}
|
||||
|
||||
for i := range a {
|
||||
if a[i] != b[i] {
|
||||
break
|
||||
}
|
||||
n++
|
||||
}
|
||||
return n
|
||||
|
||||
}
|
||||
|
|
@ -236,13 +236,16 @@ func (s *sequenceDecs) decodeSync(hist []byte) error {
|
|||
maxBlockSize = s.windowSize
|
||||
}
|
||||
|
||||
if debugDecoder {
|
||||
println("decodeSync: decoding", seqs, "sequences", br.remain(), "bits remain on stream")
|
||||
}
|
||||
for i := seqs - 1; i >= 0; i-- {
|
||||
if br.overread() {
|
||||
printf("reading sequence %d, exceeded available data\n", seqs-i)
|
||||
printf("reading sequence %d, exceeded available data. Overread by %d\n", seqs-i, -br.remain())
|
||||
return io.ErrUnexpectedEOF
|
||||
}
|
||||
var ll, mo, ml int
|
||||
if br.off > 4+((maxOffsetBits+16+16)>>3) {
|
||||
if len(br.in) > 4+((maxOffsetBits+16+16)>>3) {
|
||||
// inlined function:
|
||||
// ll, mo, ml = s.nextFast(br, llState, mlState, ofState)
|
||||
|
||||
|
|
@ -449,18 +452,13 @@ func (s *sequenceDecs) next(br *bitReader, llState, mlState, ofState decSymbol)
|
|||
|
||||
// extra bits are stored in reverse order.
|
||||
br.fill()
|
||||
if s.maxBits <= 32 {
|
||||
mo += br.getBits(moB)
|
||||
ml += br.getBits(mlB)
|
||||
ll += br.getBits(llB)
|
||||
} else {
|
||||
mo += br.getBits(moB)
|
||||
mo += br.getBits(moB)
|
||||
if s.maxBits > 32 {
|
||||
br.fill()
|
||||
// matchlength+literal length, max 32 bits
|
||||
ml += br.getBits(mlB)
|
||||
ll += br.getBits(llB)
|
||||
|
||||
}
|
||||
// matchlength+literal length, max 32 bits
|
||||
ml += br.getBits(mlB)
|
||||
ll += br.getBits(llB)
|
||||
mo = s.adjustOffset(mo, ll, moB)
|
||||
return
|
||||
}
|
||||
|
|
|
|||
|
|
@ -5,6 +5,7 @@ package zstd
|
|||
|
||||
import (
|
||||
"fmt"
|
||||
"io"
|
||||
|
||||
"github.com/klauspost/compress/internal/cpuinfo"
|
||||
)
|
||||
|
|
@ -134,6 +135,9 @@ func (s *sequenceDecs) decodeSyncSimple(hist []byte) (bool, error) {
|
|||
return true, fmt.Errorf("unexpected literal count, want %d bytes, but only %d is available",
|
||||
ctx.ll, ctx.litRemain+ctx.ll)
|
||||
|
||||
case errorOverread:
|
||||
return true, io.ErrUnexpectedEOF
|
||||
|
||||
case errorNotEnoughSpace:
|
||||
size := ctx.outPosition + ctx.ll + ctx.ml
|
||||
if debugDecoder {
|
||||
|
|
@ -202,6 +206,9 @@ const errorNotEnoughLiterals = 4
|
|||
// error reported when capacity of `out` is too small
|
||||
const errorNotEnoughSpace = 5
|
||||
|
||||
// error reported when bits are overread.
|
||||
const errorOverread = 6
|
||||
|
||||
// sequenceDecs_decode implements the main loop of sequenceDecs in x86 asm.
|
||||
//
|
||||
// Please refer to seqdec_generic.go for the reference implementation.
|
||||
|
|
@ -247,6 +254,10 @@ func (s *sequenceDecs) decode(seqs []seqVals) error {
|
|||
litRemain: len(s.literals),
|
||||
}
|
||||
|
||||
if debugDecoder {
|
||||
println("decode: decoding", len(seqs), "sequences", br.remain(), "bits remain on stream")
|
||||
}
|
||||
|
||||
s.seqSize = 0
|
||||
lte56bits := s.maxBits+s.offsets.fse.actualTableLog+s.matchLengths.fse.actualTableLog+s.litLengths.fse.actualTableLog <= 56
|
||||
var errCode int
|
||||
|
|
@ -277,6 +288,8 @@ func (s *sequenceDecs) decode(seqs []seqVals) error {
|
|||
case errorNotEnoughLiterals:
|
||||
ll := ctx.seqs[i].ll
|
||||
return fmt.Errorf("unexpected literal count, want %d bytes, but only %d is available", ll, ctx.litRemain+ll)
|
||||
case errorOverread:
|
||||
return io.ErrUnexpectedEOF
|
||||
}
|
||||
|
||||
return fmt.Errorf("sequenceDecs_decode_amd64 returned erronous code %d", errCode)
|
||||
|
|
@ -291,6 +304,9 @@ func (s *sequenceDecs) decode(seqs []seqVals) error {
|
|||
if s.seqSize > maxBlockSize {
|
||||
return fmt.Errorf("output bigger than max block size (%d)", maxBlockSize)
|
||||
}
|
||||
if debugDecoder {
|
||||
println("decode: ", br.remain(), "bits remain on stream. code:", errCode)
|
||||
}
|
||||
err := br.close()
|
||||
if err != nil {
|
||||
printf("Closing sequences: %v, %+v\n", err, *br)
|
||||
|
|
|
|||
|
|
@ -5,11 +5,11 @@
|
|||
// func sequenceDecs_decode_amd64(s *sequenceDecs, br *bitReader, ctx *decodeAsmContext) int
|
||||
// Requires: CMOV
|
||||
TEXT ·sequenceDecs_decode_amd64(SB), $8-32
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ 32(AX), DX
|
||||
MOVBQZX 40(AX), BX
|
||||
MOVQ 24(AX), SI
|
||||
MOVQ (AX), AX
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 24(CX), DX
|
||||
MOVBQZX 32(CX), BX
|
||||
MOVQ (CX), AX
|
||||
MOVQ 8(CX), SI
|
||||
ADDQ SI, AX
|
||||
MOVQ AX, (SP)
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -38,7 +38,7 @@ sequenceDecs_decode_amd64_main_loop:
|
|||
|
||||
sequenceDecs_decode_amd64_fill_byte_by_byte:
|
||||
CMPQ SI, $0x00
|
||||
JLE sequenceDecs_decode_amd64_fill_end
|
||||
JLE sequenceDecs_decode_amd64_fill_check_overread
|
||||
CMPQ BX, $0x07
|
||||
JLE sequenceDecs_decode_amd64_fill_end
|
||||
SHLQ $0x08, DX
|
||||
|
|
@ -49,6 +49,10 @@ sequenceDecs_decode_amd64_fill_byte_by_byte:
|
|||
ORQ AX, DX
|
||||
JMP sequenceDecs_decode_amd64_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decode_amd64_fill_check_overread:
|
||||
CMPQ BX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decode_amd64_fill_end:
|
||||
// Update offset
|
||||
MOVQ R9, AX
|
||||
|
|
@ -105,7 +109,7 @@ sequenceDecs_decode_amd64_ml_update_zero:
|
|||
|
||||
sequenceDecs_decode_amd64_fill_2_byte_by_byte:
|
||||
CMPQ SI, $0x00
|
||||
JLE sequenceDecs_decode_amd64_fill_2_end
|
||||
JLE sequenceDecs_decode_amd64_fill_2_check_overread
|
||||
CMPQ BX, $0x07
|
||||
JLE sequenceDecs_decode_amd64_fill_2_end
|
||||
SHLQ $0x08, DX
|
||||
|
|
@ -116,6 +120,10 @@ sequenceDecs_decode_amd64_fill_2_byte_by_byte:
|
|||
ORQ AX, DX
|
||||
JMP sequenceDecs_decode_amd64_fill_2_byte_by_byte
|
||||
|
||||
sequenceDecs_decode_amd64_fill_2_check_overread:
|
||||
CMPQ BX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decode_amd64_fill_2_end:
|
||||
// Update literal length
|
||||
MOVQ DI, AX
|
||||
|
|
@ -293,9 +301,9 @@ sequenceDecs_decode_amd64_match_len_ofs_ok:
|
|||
MOVQ R12, 152(AX)
|
||||
MOVQ R13, 160(AX)
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ DX, 32(AX)
|
||||
MOVB BL, 40(AX)
|
||||
MOVQ SI, 24(AX)
|
||||
MOVQ DX, 24(AX)
|
||||
MOVB BL, 32(AX)
|
||||
MOVQ SI, 8(AX)
|
||||
|
||||
// Return success
|
||||
MOVQ $0x00000000, ret+24(FP)
|
||||
|
|
@ -320,14 +328,19 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// func sequenceDecs_decode_56_amd64(s *sequenceDecs, br *bitReader, ctx *decodeAsmContext) int
|
||||
// Requires: CMOV
|
||||
TEXT ·sequenceDecs_decode_56_amd64(SB), $8-32
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ 32(AX), DX
|
||||
MOVBQZX 40(AX), BX
|
||||
MOVQ 24(AX), SI
|
||||
MOVQ (AX), AX
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 24(CX), DX
|
||||
MOVBQZX 32(CX), BX
|
||||
MOVQ (CX), AX
|
||||
MOVQ 8(CX), SI
|
||||
ADDQ SI, AX
|
||||
MOVQ AX, (SP)
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -356,7 +369,7 @@ sequenceDecs_decode_56_amd64_main_loop:
|
|||
|
||||
sequenceDecs_decode_56_amd64_fill_byte_by_byte:
|
||||
CMPQ SI, $0x00
|
||||
JLE sequenceDecs_decode_56_amd64_fill_end
|
||||
JLE sequenceDecs_decode_56_amd64_fill_check_overread
|
||||
CMPQ BX, $0x07
|
||||
JLE sequenceDecs_decode_56_amd64_fill_end
|
||||
SHLQ $0x08, DX
|
||||
|
|
@ -367,6 +380,10 @@ sequenceDecs_decode_56_amd64_fill_byte_by_byte:
|
|||
ORQ AX, DX
|
||||
JMP sequenceDecs_decode_56_amd64_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decode_56_amd64_fill_check_overread:
|
||||
CMPQ BX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decode_56_amd64_fill_end:
|
||||
// Update offset
|
||||
MOVQ R9, AX
|
||||
|
|
@ -586,9 +603,9 @@ sequenceDecs_decode_56_amd64_match_len_ofs_ok:
|
|||
MOVQ R12, 152(AX)
|
||||
MOVQ R13, 160(AX)
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ DX, 32(AX)
|
||||
MOVB BL, 40(AX)
|
||||
MOVQ SI, 24(AX)
|
||||
MOVQ DX, 24(AX)
|
||||
MOVB BL, 32(AX)
|
||||
MOVQ SI, 8(AX)
|
||||
|
||||
// Return success
|
||||
MOVQ $0x00000000, ret+24(FP)
|
||||
|
|
@ -613,14 +630,19 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// func sequenceDecs_decode_bmi2(s *sequenceDecs, br *bitReader, ctx *decodeAsmContext) int
|
||||
// Requires: BMI, BMI2, CMOV
|
||||
TEXT ·sequenceDecs_decode_bmi2(SB), $8-32
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 32(CX), AX
|
||||
MOVBQZX 40(CX), DX
|
||||
MOVQ 24(CX), BX
|
||||
MOVQ (CX), CX
|
||||
MOVQ br+8(FP), BX
|
||||
MOVQ 24(BX), AX
|
||||
MOVBQZX 32(BX), DX
|
||||
MOVQ (BX), CX
|
||||
MOVQ 8(BX), BX
|
||||
ADDQ BX, CX
|
||||
MOVQ CX, (SP)
|
||||
MOVQ ctx+16(FP), CX
|
||||
|
|
@ -649,7 +671,7 @@ sequenceDecs_decode_bmi2_main_loop:
|
|||
|
||||
sequenceDecs_decode_bmi2_fill_byte_by_byte:
|
||||
CMPQ BX, $0x00
|
||||
JLE sequenceDecs_decode_bmi2_fill_end
|
||||
JLE sequenceDecs_decode_bmi2_fill_check_overread
|
||||
CMPQ DX, $0x07
|
||||
JLE sequenceDecs_decode_bmi2_fill_end
|
||||
SHLQ $0x08, AX
|
||||
|
|
@ -660,6 +682,10 @@ sequenceDecs_decode_bmi2_fill_byte_by_byte:
|
|||
ORQ CX, AX
|
||||
JMP sequenceDecs_decode_bmi2_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decode_bmi2_fill_check_overread:
|
||||
CMPQ DX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decode_bmi2_fill_end:
|
||||
// Update offset
|
||||
MOVQ $0x00000808, CX
|
||||
|
|
@ -700,7 +726,7 @@ sequenceDecs_decode_bmi2_fill_end:
|
|||
|
||||
sequenceDecs_decode_bmi2_fill_2_byte_by_byte:
|
||||
CMPQ BX, $0x00
|
||||
JLE sequenceDecs_decode_bmi2_fill_2_end
|
||||
JLE sequenceDecs_decode_bmi2_fill_2_check_overread
|
||||
CMPQ DX, $0x07
|
||||
JLE sequenceDecs_decode_bmi2_fill_2_end
|
||||
SHLQ $0x08, AX
|
||||
|
|
@ -711,6 +737,10 @@ sequenceDecs_decode_bmi2_fill_2_byte_by_byte:
|
|||
ORQ CX, AX
|
||||
JMP sequenceDecs_decode_bmi2_fill_2_byte_by_byte
|
||||
|
||||
sequenceDecs_decode_bmi2_fill_2_check_overread:
|
||||
CMPQ DX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decode_bmi2_fill_2_end:
|
||||
// Update literal length
|
||||
MOVQ $0x00000808, CX
|
||||
|
|
@ -862,9 +892,9 @@ sequenceDecs_decode_bmi2_match_len_ofs_ok:
|
|||
MOVQ R11, 152(CX)
|
||||
MOVQ R12, 160(CX)
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ AX, 32(CX)
|
||||
MOVB DL, 40(CX)
|
||||
MOVQ BX, 24(CX)
|
||||
MOVQ AX, 24(CX)
|
||||
MOVB DL, 32(CX)
|
||||
MOVQ BX, 8(CX)
|
||||
|
||||
// Return success
|
||||
MOVQ $0x00000000, ret+24(FP)
|
||||
|
|
@ -889,14 +919,19 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// func sequenceDecs_decode_56_bmi2(s *sequenceDecs, br *bitReader, ctx *decodeAsmContext) int
|
||||
// Requires: BMI, BMI2, CMOV
|
||||
TEXT ·sequenceDecs_decode_56_bmi2(SB), $8-32
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 32(CX), AX
|
||||
MOVBQZX 40(CX), DX
|
||||
MOVQ 24(CX), BX
|
||||
MOVQ (CX), CX
|
||||
MOVQ br+8(FP), BX
|
||||
MOVQ 24(BX), AX
|
||||
MOVBQZX 32(BX), DX
|
||||
MOVQ (BX), CX
|
||||
MOVQ 8(BX), BX
|
||||
ADDQ BX, CX
|
||||
MOVQ CX, (SP)
|
||||
MOVQ ctx+16(FP), CX
|
||||
|
|
@ -925,7 +960,7 @@ sequenceDecs_decode_56_bmi2_main_loop:
|
|||
|
||||
sequenceDecs_decode_56_bmi2_fill_byte_by_byte:
|
||||
CMPQ BX, $0x00
|
||||
JLE sequenceDecs_decode_56_bmi2_fill_end
|
||||
JLE sequenceDecs_decode_56_bmi2_fill_check_overread
|
||||
CMPQ DX, $0x07
|
||||
JLE sequenceDecs_decode_56_bmi2_fill_end
|
||||
SHLQ $0x08, AX
|
||||
|
|
@ -936,6 +971,10 @@ sequenceDecs_decode_56_bmi2_fill_byte_by_byte:
|
|||
ORQ CX, AX
|
||||
JMP sequenceDecs_decode_56_bmi2_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decode_56_bmi2_fill_check_overread:
|
||||
CMPQ DX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decode_56_bmi2_fill_end:
|
||||
// Update offset
|
||||
MOVQ $0x00000808, CX
|
||||
|
|
@ -1113,9 +1152,9 @@ sequenceDecs_decode_56_bmi2_match_len_ofs_ok:
|
|||
MOVQ R11, 152(CX)
|
||||
MOVQ R12, 160(CX)
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ AX, 32(CX)
|
||||
MOVB DL, 40(CX)
|
||||
MOVQ BX, 24(CX)
|
||||
MOVQ AX, 24(CX)
|
||||
MOVB DL, 32(CX)
|
||||
MOVQ BX, 8(CX)
|
||||
|
||||
// Return success
|
||||
MOVQ $0x00000000, ret+24(FP)
|
||||
|
|
@ -1140,6 +1179,11 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// func sequenceDecs_executeSimple_amd64(ctx *executeAsmContext) bool
|
||||
// Requires: SSE
|
||||
TEXT ·sequenceDecs_executeSimple_amd64(SB), $8-9
|
||||
|
|
@ -1753,11 +1797,11 @@ empty_seqs:
|
|||
// func sequenceDecs_decodeSync_amd64(s *sequenceDecs, br *bitReader, ctx *decodeSyncAsmContext) int
|
||||
// Requires: CMOV, SSE
|
||||
TEXT ·sequenceDecs_decodeSync_amd64(SB), $64-32
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ 32(AX), DX
|
||||
MOVBQZX 40(AX), BX
|
||||
MOVQ 24(AX), SI
|
||||
MOVQ (AX), AX
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 24(CX), DX
|
||||
MOVBQZX 32(CX), BX
|
||||
MOVQ (CX), AX
|
||||
MOVQ 8(CX), SI
|
||||
ADDQ SI, AX
|
||||
MOVQ AX, (SP)
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -1804,7 +1848,7 @@ sequenceDecs_decodeSync_amd64_main_loop:
|
|||
|
||||
sequenceDecs_decodeSync_amd64_fill_byte_by_byte:
|
||||
CMPQ SI, $0x00
|
||||
JLE sequenceDecs_decodeSync_amd64_fill_end
|
||||
JLE sequenceDecs_decodeSync_amd64_fill_check_overread
|
||||
CMPQ BX, $0x07
|
||||
JLE sequenceDecs_decodeSync_amd64_fill_end
|
||||
SHLQ $0x08, DX
|
||||
|
|
@ -1815,6 +1859,10 @@ sequenceDecs_decodeSync_amd64_fill_byte_by_byte:
|
|||
ORQ AX, DX
|
||||
JMP sequenceDecs_decodeSync_amd64_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_amd64_fill_check_overread:
|
||||
CMPQ BX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_amd64_fill_end:
|
||||
// Update offset
|
||||
MOVQ R9, AX
|
||||
|
|
@ -1871,7 +1919,7 @@ sequenceDecs_decodeSync_amd64_ml_update_zero:
|
|||
|
||||
sequenceDecs_decodeSync_amd64_fill_2_byte_by_byte:
|
||||
CMPQ SI, $0x00
|
||||
JLE sequenceDecs_decodeSync_amd64_fill_2_end
|
||||
JLE sequenceDecs_decodeSync_amd64_fill_2_check_overread
|
||||
CMPQ BX, $0x07
|
||||
JLE sequenceDecs_decodeSync_amd64_fill_2_end
|
||||
SHLQ $0x08, DX
|
||||
|
|
@ -1882,6 +1930,10 @@ sequenceDecs_decodeSync_amd64_fill_2_byte_by_byte:
|
|||
ORQ AX, DX
|
||||
JMP sequenceDecs_decodeSync_amd64_fill_2_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_amd64_fill_2_check_overread:
|
||||
CMPQ BX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_amd64_fill_2_end:
|
||||
// Update literal length
|
||||
MOVQ DI, AX
|
||||
|
|
@ -2243,9 +2295,9 @@ handle_loop:
|
|||
|
||||
loop_finished:
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ DX, 32(AX)
|
||||
MOVB BL, 40(AX)
|
||||
MOVQ SI, 24(AX)
|
||||
MOVQ DX, 24(AX)
|
||||
MOVB BL, 32(AX)
|
||||
MOVQ SI, 8(AX)
|
||||
|
||||
// Update the context
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -2291,6 +2343,11 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with not enough output space error
|
||||
error_not_enough_space:
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -2305,11 +2362,11 @@ error_not_enough_space:
|
|||
// func sequenceDecs_decodeSync_bmi2(s *sequenceDecs, br *bitReader, ctx *decodeSyncAsmContext) int
|
||||
// Requires: BMI, BMI2, CMOV, SSE
|
||||
TEXT ·sequenceDecs_decodeSync_bmi2(SB), $64-32
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 32(CX), AX
|
||||
MOVBQZX 40(CX), DX
|
||||
MOVQ 24(CX), BX
|
||||
MOVQ (CX), CX
|
||||
MOVQ br+8(FP), BX
|
||||
MOVQ 24(BX), AX
|
||||
MOVBQZX 32(BX), DX
|
||||
MOVQ (BX), CX
|
||||
MOVQ 8(BX), BX
|
||||
ADDQ BX, CX
|
||||
MOVQ CX, (SP)
|
||||
MOVQ ctx+16(FP), CX
|
||||
|
|
@ -2356,7 +2413,7 @@ sequenceDecs_decodeSync_bmi2_main_loop:
|
|||
|
||||
sequenceDecs_decodeSync_bmi2_fill_byte_by_byte:
|
||||
CMPQ BX, $0x00
|
||||
JLE sequenceDecs_decodeSync_bmi2_fill_end
|
||||
JLE sequenceDecs_decodeSync_bmi2_fill_check_overread
|
||||
CMPQ DX, $0x07
|
||||
JLE sequenceDecs_decodeSync_bmi2_fill_end
|
||||
SHLQ $0x08, AX
|
||||
|
|
@ -2367,6 +2424,10 @@ sequenceDecs_decodeSync_bmi2_fill_byte_by_byte:
|
|||
ORQ CX, AX
|
||||
JMP sequenceDecs_decodeSync_bmi2_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_bmi2_fill_check_overread:
|
||||
CMPQ DX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_bmi2_fill_end:
|
||||
// Update offset
|
||||
MOVQ $0x00000808, CX
|
||||
|
|
@ -2407,7 +2468,7 @@ sequenceDecs_decodeSync_bmi2_fill_end:
|
|||
|
||||
sequenceDecs_decodeSync_bmi2_fill_2_byte_by_byte:
|
||||
CMPQ BX, $0x00
|
||||
JLE sequenceDecs_decodeSync_bmi2_fill_2_end
|
||||
JLE sequenceDecs_decodeSync_bmi2_fill_2_check_overread
|
||||
CMPQ DX, $0x07
|
||||
JLE sequenceDecs_decodeSync_bmi2_fill_2_end
|
||||
SHLQ $0x08, AX
|
||||
|
|
@ -2418,6 +2479,10 @@ sequenceDecs_decodeSync_bmi2_fill_2_byte_by_byte:
|
|||
ORQ CX, AX
|
||||
JMP sequenceDecs_decodeSync_bmi2_fill_2_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_bmi2_fill_2_check_overread:
|
||||
CMPQ DX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_bmi2_fill_2_end:
|
||||
// Update literal length
|
||||
MOVQ $0x00000808, CX
|
||||
|
|
@ -2753,9 +2818,9 @@ handle_loop:
|
|||
|
||||
loop_finished:
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ AX, 32(CX)
|
||||
MOVB DL, 40(CX)
|
||||
MOVQ BX, 24(CX)
|
||||
MOVQ AX, 24(CX)
|
||||
MOVB DL, 32(CX)
|
||||
MOVQ BX, 8(CX)
|
||||
|
||||
// Update the context
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -2801,6 +2866,11 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with not enough output space error
|
||||
error_not_enough_space:
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -2815,11 +2885,11 @@ error_not_enough_space:
|
|||
// func sequenceDecs_decodeSync_safe_amd64(s *sequenceDecs, br *bitReader, ctx *decodeSyncAsmContext) int
|
||||
// Requires: CMOV, SSE
|
||||
TEXT ·sequenceDecs_decodeSync_safe_amd64(SB), $64-32
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ 32(AX), DX
|
||||
MOVBQZX 40(AX), BX
|
||||
MOVQ 24(AX), SI
|
||||
MOVQ (AX), AX
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 24(CX), DX
|
||||
MOVBQZX 32(CX), BX
|
||||
MOVQ (CX), AX
|
||||
MOVQ 8(CX), SI
|
||||
ADDQ SI, AX
|
||||
MOVQ AX, (SP)
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -2866,7 +2936,7 @@ sequenceDecs_decodeSync_safe_amd64_main_loop:
|
|||
|
||||
sequenceDecs_decodeSync_safe_amd64_fill_byte_by_byte:
|
||||
CMPQ SI, $0x00
|
||||
JLE sequenceDecs_decodeSync_safe_amd64_fill_end
|
||||
JLE sequenceDecs_decodeSync_safe_amd64_fill_check_overread
|
||||
CMPQ BX, $0x07
|
||||
JLE sequenceDecs_decodeSync_safe_amd64_fill_end
|
||||
SHLQ $0x08, DX
|
||||
|
|
@ -2877,6 +2947,10 @@ sequenceDecs_decodeSync_safe_amd64_fill_byte_by_byte:
|
|||
ORQ AX, DX
|
||||
JMP sequenceDecs_decodeSync_safe_amd64_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_safe_amd64_fill_check_overread:
|
||||
CMPQ BX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_safe_amd64_fill_end:
|
||||
// Update offset
|
||||
MOVQ R9, AX
|
||||
|
|
@ -2933,7 +3007,7 @@ sequenceDecs_decodeSync_safe_amd64_ml_update_zero:
|
|||
|
||||
sequenceDecs_decodeSync_safe_amd64_fill_2_byte_by_byte:
|
||||
CMPQ SI, $0x00
|
||||
JLE sequenceDecs_decodeSync_safe_amd64_fill_2_end
|
||||
JLE sequenceDecs_decodeSync_safe_amd64_fill_2_check_overread
|
||||
CMPQ BX, $0x07
|
||||
JLE sequenceDecs_decodeSync_safe_amd64_fill_2_end
|
||||
SHLQ $0x08, DX
|
||||
|
|
@ -2944,6 +3018,10 @@ sequenceDecs_decodeSync_safe_amd64_fill_2_byte_by_byte:
|
|||
ORQ AX, DX
|
||||
JMP sequenceDecs_decodeSync_safe_amd64_fill_2_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_safe_amd64_fill_2_check_overread:
|
||||
CMPQ BX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_safe_amd64_fill_2_end:
|
||||
// Update literal length
|
||||
MOVQ DI, AX
|
||||
|
|
@ -3407,9 +3485,9 @@ handle_loop:
|
|||
|
||||
loop_finished:
|
||||
MOVQ br+8(FP), AX
|
||||
MOVQ DX, 32(AX)
|
||||
MOVB BL, 40(AX)
|
||||
MOVQ SI, 24(AX)
|
||||
MOVQ DX, 24(AX)
|
||||
MOVB BL, 32(AX)
|
||||
MOVQ SI, 8(AX)
|
||||
|
||||
// Update the context
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -3455,6 +3533,11 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with not enough output space error
|
||||
error_not_enough_space:
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -3469,11 +3552,11 @@ error_not_enough_space:
|
|||
// func sequenceDecs_decodeSync_safe_bmi2(s *sequenceDecs, br *bitReader, ctx *decodeSyncAsmContext) int
|
||||
// Requires: BMI, BMI2, CMOV, SSE
|
||||
TEXT ·sequenceDecs_decodeSync_safe_bmi2(SB), $64-32
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ 32(CX), AX
|
||||
MOVBQZX 40(CX), DX
|
||||
MOVQ 24(CX), BX
|
||||
MOVQ (CX), CX
|
||||
MOVQ br+8(FP), BX
|
||||
MOVQ 24(BX), AX
|
||||
MOVBQZX 32(BX), DX
|
||||
MOVQ (BX), CX
|
||||
MOVQ 8(BX), BX
|
||||
ADDQ BX, CX
|
||||
MOVQ CX, (SP)
|
||||
MOVQ ctx+16(FP), CX
|
||||
|
|
@ -3520,7 +3603,7 @@ sequenceDecs_decodeSync_safe_bmi2_main_loop:
|
|||
|
||||
sequenceDecs_decodeSync_safe_bmi2_fill_byte_by_byte:
|
||||
CMPQ BX, $0x00
|
||||
JLE sequenceDecs_decodeSync_safe_bmi2_fill_end
|
||||
JLE sequenceDecs_decodeSync_safe_bmi2_fill_check_overread
|
||||
CMPQ DX, $0x07
|
||||
JLE sequenceDecs_decodeSync_safe_bmi2_fill_end
|
||||
SHLQ $0x08, AX
|
||||
|
|
@ -3531,6 +3614,10 @@ sequenceDecs_decodeSync_safe_bmi2_fill_byte_by_byte:
|
|||
ORQ CX, AX
|
||||
JMP sequenceDecs_decodeSync_safe_bmi2_fill_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_safe_bmi2_fill_check_overread:
|
||||
CMPQ DX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_safe_bmi2_fill_end:
|
||||
// Update offset
|
||||
MOVQ $0x00000808, CX
|
||||
|
|
@ -3571,7 +3658,7 @@ sequenceDecs_decodeSync_safe_bmi2_fill_end:
|
|||
|
||||
sequenceDecs_decodeSync_safe_bmi2_fill_2_byte_by_byte:
|
||||
CMPQ BX, $0x00
|
||||
JLE sequenceDecs_decodeSync_safe_bmi2_fill_2_end
|
||||
JLE sequenceDecs_decodeSync_safe_bmi2_fill_2_check_overread
|
||||
CMPQ DX, $0x07
|
||||
JLE sequenceDecs_decodeSync_safe_bmi2_fill_2_end
|
||||
SHLQ $0x08, AX
|
||||
|
|
@ -3582,6 +3669,10 @@ sequenceDecs_decodeSync_safe_bmi2_fill_2_byte_by_byte:
|
|||
ORQ CX, AX
|
||||
JMP sequenceDecs_decodeSync_safe_bmi2_fill_2_byte_by_byte
|
||||
|
||||
sequenceDecs_decodeSync_safe_bmi2_fill_2_check_overread:
|
||||
CMPQ DX, $0x40
|
||||
JA error_overread
|
||||
|
||||
sequenceDecs_decodeSync_safe_bmi2_fill_2_end:
|
||||
// Update literal length
|
||||
MOVQ $0x00000808, CX
|
||||
|
|
@ -4019,9 +4110,9 @@ handle_loop:
|
|||
|
||||
loop_finished:
|
||||
MOVQ br+8(FP), CX
|
||||
MOVQ AX, 32(CX)
|
||||
MOVB DL, 40(CX)
|
||||
MOVQ BX, 24(CX)
|
||||
MOVQ AX, 24(CX)
|
||||
MOVB DL, 32(CX)
|
||||
MOVQ BX, 8(CX)
|
||||
|
||||
// Update the context
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
@ -4067,6 +4158,11 @@ error_not_enough_literals:
|
|||
MOVQ $0x00000004, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with overread error
|
||||
error_overread:
|
||||
MOVQ $0x00000006, ret+24(FP)
|
||||
RET
|
||||
|
||||
// Return with not enough output space error
|
||||
error_not_enough_space:
|
||||
MOVQ ctx+16(FP), AX
|
||||
|
|
|
|||
|
|
@ -29,7 +29,7 @@ func (s *sequenceDecs) decode(seqs []seqVals) error {
|
|||
}
|
||||
for i := range seqs {
|
||||
var ll, mo, ml int
|
||||
if br.off > 4+((maxOffsetBits+16+16)>>3) {
|
||||
if len(br.in) > 4+((maxOffsetBits+16+16)>>3) {
|
||||
// inlined function:
|
||||
// ll, mo, ml = s.nextFast(br, llState, mlState, ofState)
|
||||
|
||||
|
|
|
|||
|
|
@ -95,10 +95,9 @@ func (r *SnappyConverter) Convert(in io.Reader, w io.Writer) (int64, error) {
|
|||
var written int64
|
||||
var readHeader bool
|
||||
{
|
||||
var header []byte
|
||||
var n int
|
||||
header, r.err = frameHeader{WindowSize: snappyMaxBlockSize}.appendTo(r.buf[:0])
|
||||
header := frameHeader{WindowSize: snappyMaxBlockSize}.appendTo(r.buf[:0])
|
||||
|
||||
var n int
|
||||
n, r.err = w.Write(header)
|
||||
if r.err != nil {
|
||||
return written, r.err
|
||||
|
|
|
|||
|
|
@ -9,7 +9,6 @@ import (
|
|||
"errors"
|
||||
"log"
|
||||
"math"
|
||||
"math/bits"
|
||||
)
|
||||
|
||||
// enable debug printing
|
||||
|
|
@ -106,33 +105,12 @@ func printf(format string, a ...interface{}) {
|
|||
}
|
||||
}
|
||||
|
||||
// matchLen returns the maximum common prefix length of a and b.
|
||||
// a must be the shortest of the two.
|
||||
func matchLen(a, b []byte) (n int) {
|
||||
for ; len(a) >= 8 && len(b) >= 8; a, b = a[8:], b[8:] {
|
||||
diff := binary.LittleEndian.Uint64(a) ^ binary.LittleEndian.Uint64(b)
|
||||
if diff != 0 {
|
||||
return n + bits.TrailingZeros64(diff)>>3
|
||||
}
|
||||
n += 8
|
||||
}
|
||||
|
||||
for i := range a {
|
||||
if a[i] != b[i] {
|
||||
break
|
||||
}
|
||||
n++
|
||||
}
|
||||
return n
|
||||
|
||||
}
|
||||
|
||||
func load3232(b []byte, i int32) uint32 {
|
||||
return binary.LittleEndian.Uint32(b[i:])
|
||||
return binary.LittleEndian.Uint32(b[:len(b):len(b)][i:])
|
||||
}
|
||||
|
||||
func load6432(b []byte, i int32) uint64 {
|
||||
return binary.LittleEndian.Uint64(b[i:])
|
||||
return binary.LittleEndian.Uint64(b[:len(b):len(b)][i:])
|
||||
}
|
||||
|
||||
type byter interface {
|
||||
|
|
|
|||
|
|
@ -447,7 +447,7 @@ github.com/josharian/intern
|
|||
# github.com/json-iterator/go v1.1.12
|
||||
## explicit; go 1.12
|
||||
github.com/json-iterator/go
|
||||
# github.com/klauspost/compress v1.16.3
|
||||
# github.com/klauspost/compress v1.17.2
|
||||
## explicit; go 1.18
|
||||
github.com/klauspost/compress
|
||||
github.com/klauspost/compress/fse
|
||||
|
|
|
|||
Loading…
Reference in New Issue