Decryption performance improvement

Changed

• Decryption: performance improvement.
  Introduce helpers.calculate_key3(), which utilize list comprehension expression, bytes generation
  with join(). It reduces a number of calls of hash library and improve decryption performance.

Improve behavior when overwriting archive

Changed

• Extraction: Unlink output file if exist when it become a symbolic link.
  When overwrite extracted files and there are symlinks, it may cause an unexpected result.
  Unlinking it may help it.

Show progress and dereference options

Added

• Support dereference option of SevenZipFile class. (#131)
  If dereference is False, add symbolic and hard links to the archive.
  If it is True, add the content of the target files to the archive.
  This has no effect on systems that do not support symbolic links.
• Introduce progress callback mechanism (#130)

Changed

• CLI: add --verbose option for extraction
• win32: update win32compat

Fixed

• Fix archiveinfo() for 7zAES archives
• Release variables when close() (#129)

Long path support on Windows 10, Windows Server 2016R2 and later

Fixed

• Support extraction of file onto a place where path length is > 260 bytes on Windows 10, Windows Server 2016R2
  and later. (Windows Vista, 7 and Windows Server 2012 still have a limitation of path length as a OS spec)(#116, #126)

Support zstandard, memory IO API and more

Added

• Support memory API.(#111, #119)
  Introduce read(filter) and readall() method for SevenZipFile class.
• Support ZStandard codec compression algorithm for extraction.(#124, #125)

Changed

• Drop pywin32 dependency
• Introduce internal win32compat.py
• Archive: Looking for symbolic link object in the archived list,
  and if found, record as relative link.(#112, #113, #122)

Removed

• Revmoed requirements.txt. When you want to install dependencies for development
  you can do it with 'pip install -e path/to/py7zr_project'

Decryption support

Added

• Test: SevenZipFile.archiveinfo() for various archives.
• Test: extraction of LZMA+BCJ archive become fails as marked known issue.
• Support deflate decompression method.

Changed

• Update documents and README about supported algorithms.
• Re-enable coverage report.
• Refactoring SevenZipFile._write_archive() method to move
  core chunk into compression module Worker.archive() method.
• Update calculate_key helper to improve performance.
• Introduce zero-copy buffer helper.
• Change decompressor class interface
  • change max_length type to int and defualt to -1.
• Update decryption function to improve performance.

Fixed

• Fix SevenZipFIle.archiveinfo() crash for LZMA+BCJ archive.(#100)
• Fix SevenZipFile.test() method defeated from v0.6b2 (#103)
• Fix SevenZipFile.solid() method to return proper value. (#72,#97)

V0.6 Release candidate

Move to v0.6 release candidate

Signed-off-by: Hiroshi Miura <[email protected]>

Fix archiveinfo() solid property

Fixed

• Fix _is_solid() method to return correct result.(#72)

No more os.chdir()

Prepare for v0.5.4 (again)

Signed-off-by: Hiroshi Miura <[email protected]>

Introduce context manager for SevenZipFile

Added

• Introduce context manager for SevenZipFile (#95)

Changed

• SevenZipFile(file-object, 'r') now can run extract() well even unlink before extract().

Fixed

• Fix README example for extraction option.
• Some of decryption of encrypted archive fails.(#75)