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go1.16 (#14783)
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techknowlogick
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vendor/github.com/ulikunitz/xz/TODO.md
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116
vendor/github.com/ulikunitz/xz/TODO.md
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@@ -8,19 +8,17 @@
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1. Review encoder and check for lzma improvements under xz.
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2. Fix binary tree matcher.
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3. Compare compression ratio with xz tool using comparable parameters
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and optimize parameters
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4. Do some optimizations
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- rename operation action and make it a simple type of size 8
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- make maxMatches, wordSize parameters
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- stop searching after a certain length is found (parameter sweetLen)
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3. Compare compression ratio with xz tool using comparable parameters and optimize parameters
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4. rename operation action and make it a simple type of size 8
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5. make maxMatches, wordSize parameters
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6. stop searching after a certain length is found (parameter sweetLen)
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## Release v0.7
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1. Optimize code
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2. Do statistical analysis to get linear presets.
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3. Test sync.Pool compatability for xz and lzma Writer and Reader
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3. Fuzz optimized code.
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4. Fuzz optimized code.
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## Release v0.8
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@@ -44,53 +42,81 @@
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## Package lzma
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### Release v0.6
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- Rewrite Encoder into a simple greedy one-op-at-a-time encoder
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including
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+ simple scan at the dictionary head for the same byte
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+ use the killer byte (requiring matches to get longer, the first
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test should be the byte that would make the match longer)
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### v0.6
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* Rewrite Encoder into a simple greedy one-op-at-a-time encoder including
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* simple scan at the dictionary head for the same byte
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* use the killer byte (requiring matches to get longer, the first test should be the byte that would make the match longer)
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## Optimizations
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- There may be a lot of false sharing in lzma.State; check whether this
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can be improved by reorganizing the internal structure of it.
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- Check whether batching encoding and decoding improves speed.
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* There may be a lot of false sharing in lzma. State; check whether this can be improved by reorganizing the internal structure of it.
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* Check whether batching encoding and decoding improves speed.
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### DAG optimizations
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- Use full buffer to create minimal bit-length above range encoder.
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- Might be too slow (see v0.4)
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* Use full buffer to create minimal bit-length above range encoder.
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* Might be too slow (see v0.4)
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### Different match finders
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- hashes with 2, 3 characters additional to 4 characters
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- binary trees with 2-7 characters (uint64 as key, use uint32 as
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* hashes with 2, 3 characters additional to 4 characters
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* binary trees with 2-7 characters (uint64 as key, use uint32 as
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pointers into a an array)
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- rb-trees with 2-7 characters (uint64 as key, use uint32 as pointers
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* rb-trees with 2-7 characters (uint64 as key, use uint32 as pointers
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into an array with bit-steeling for the colors)
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## Release Procedure
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- execute goch -l for all packages; probably with lower param like 0.5.
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- check orthography with gospell
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- Write release notes in doc/relnotes.
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- Update README.md
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- xb copyright . in xz directory to ensure all new files have Copyright
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header
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- VERSION=<version> go generate github.com/ulikunitz/xz/... to update
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version files
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- Execute test for Linux/amd64, Linux/x86 and Windows/amd64.
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- Update TODO.md - write short log entry
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- git checkout master && git merge dev
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- git tag -a <version>
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- git push
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* execute goch -l for all packages; probably with lower param like 0.5.
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* check orthography with gospell
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* Write release notes in doc/relnotes.
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* Update README.md
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* xb copyright . in xz directory to ensure all new files have Copyright header
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* `VERSION=<version> go generate github.com/ulikunitz/xz/...` to update version files
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* Execute test for Linux/amd64, Linux/x86 and Windows/amd64.
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* Update TODO.md - write short log entry
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* `git checkout master && git merge dev`
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* `git tag -a <version>`
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* `git push`
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## Log
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## 2020-08-19
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### 2021-02-02
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Mituo Heijo has fuzzed xz and found a bug in the function readIndexBody. The
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function allocated a slice of records immediately after reading the value
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without further checks. Since the number has been too large the make function
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did panic. The fix is to check the number against the expected number of records
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before allocating the records.
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### 2020-12-17
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Release v0.5.9 fixes warnings, a typo and adds SECURITY.md.
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One fix is interesting.
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```go
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const (
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a byte = 0x1
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b = 0x2
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)
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```
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The constants a and b don't have the same type. Correct is
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```go
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const (
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a byte = 0x1
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b byte = 0x2
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)
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```
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### 2020-08-19
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Release v0.5.8 fixes issue
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[issue #35](https://github.com/ulikunitz/xz/issues/35).
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@@ -208,8 +234,8 @@ MININT.
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### 2015-06-04
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It has been a productive day. I improved the interface of lzma.Reader
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and lzma.Writer and fixed the error handling.
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It has been a productive day. I improved the interface of lzma. Reader
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and lzma. Writer and fixed the error handling.
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### 2015-06-01
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@@ -260,7 +286,7 @@ needed anymore.
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However I will implement a ReaderState and WriterState type to use
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static typing to ensure the right State object is combined with the
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right lzbase.Reader and lzbase.Writer.
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right lzbase. Reader and lzbase. Writer.
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As a start I have implemented ReaderState and WriterState to ensure
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that the state for reading is only used by readers and WriterState only
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@@ -282,11 +308,11 @@ old lzma package has been completely removed.
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### 2015-04-05
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Implemented lzma.Reader and tested it.
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Implemented lzma. Reader and tested it.
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### 2015-04-04
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Implemented baseReader by adapting code form lzma.Reader.
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Implemented baseReader by adapting code form lzma. Reader.
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### 2015-04-03
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@@ -302,7 +328,7 @@ However in Francesco Campoy's presentation "Go for Javaneros
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(Javaïstes?)" is the the idea that using an embedded field E, all the
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methods of E will be defined on T. If E is an interface T satisfies E.
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https://talks.golang.org/2014/go4java.slide#51
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<https://talks.golang.org/2014/go4java.slide#51>
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I have never used this, but it seems to be a cool idea.
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@@ -327,11 +353,11 @@ and the opCodec.
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1. Implemented simple lzmago tool
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2. Tested tool against large 4.4G file
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- compression worked correctly; tested decompression with lzma
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- decompression hits a full buffer condition
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* compression worked correctly; tested decompression with lzma
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* decompression hits a full buffer condition
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3. Fixed a bug in the compressor and wrote a test for it
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4. Executed full cycle for 4.4 GB file; performance can be improved ;-)
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### 2015-01-11
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- Release v0.2 because of the working LZMA encoder and decoder
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* Release v0.2 because of the working LZMA encoder and decoder
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