• Added support to Linux and macOS (issue #19).
• Added support to the MinGW compiler.
• Dropped support to old MSVC 2012 and 2013.
• The project requires at least a C++14 compiler to build; the public API is still C++11-compatible.
• Removed QMake and MSBuild project files: now bit7z uses only CMake as its build system.
• Removed format restriction to memory compression.
• Renamed BitArchiveInfo to BitArchiveReader.
• Added support to extracting/testing the input archive of BitArchiveReader.
• Made BitArchiveReader/BitInputArchive behave like an std container (e.g., added iterators).
• Added support for canceling ongoing operation in progress callback (issue #37).
• Added support to set the number of threads used when compressing (issue #38).
• Added support for extracting without retaining the directory structure (issue #34).
• Added the possibility to choose the word size to use when compressing.
• Added the BitArchiveWriter class that allows creating a single new archive or updating an old one with new items.
• Added the BitArchiveEditor class that allows editing existing archives.
  • Added support for renaming/deleting items inside an archive (issue #43).
• Added different archive update modes:
  • None: Trying to update and archive will throw a BitException.
  • Append: New items will be appended to the archive (i.e., the old update behavior).
  • Overwrite: New items whose path already exists in the archive will be overwritten, and others will be appended.
• Changed file callback to make it report the full path of the file (issue #46).
• Added the possibility to extract a specific file to buffer (issue #32).
• Fixed and improve the public API.
• Renamed the BitExtractor class to BitFileExtractor.
  • Now, BitExtractor is just a template class for all the extraction classes.
• Renamed the BitCompressor class to BitFileCompressor.
  • Now, BitCompressor is just a template class for all the compression classes.
• Changed the default string type to std::string instead of std::wstring.
  • std::strings are considered UTF-8 encoded: the project will follow the UTF-8 Everywhere Manifesto.
  • This allows using the library in cross-platform projects more quickly.
  • You can still achieve the old behavior by using bit7z with the -DBIT7Z_USE_NATIVE_STRING CMake option. In this case:
    • On Windows, the default string type will be std::wstring (as in bit7z v3);
    • On Linux and macOS, it will remain std::string.
• Added an initial unit test subproject (can be enabled via the BIT7Z_BUILD_TESTS option).
• Fixed some edge cases in the wildcard matching function.
• Added a basic OverwriteMode enum that allows configuring how to deal with when an output file or buffer already exists (issue #116). It works for both compressors and extractors.
  • None: The archive handler will throw an exception.
  • Overwrite: The handler will overwrite the old file or buffer with the new one.
  • Skip: The handler will skip writing to the output file or buffer.
• Added a getter for the CRC value of a BitArchiveItem.
• Added option for generating Position Independent Code (issue #117).
• Allow setting archive format properties as described in the 7-zip docs (close issues #91 and #103).
• Moved public API headers to the include/bit7z/ folder.
• Added an option to automatically prepend paths with the long path prefix (issue #45).
• Added an option to build the Doxygen documentation.
• Clean up code and fix code formatting.
• Re-licensed the project under the MPLv2 (issue #86).

Full Changelog: v3.2.0...v4.0.0