kc3-lang/brotli/research/deorummolae.h

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• Hash : 35e69fc7
  Author :
  Date : 2018-02-26T09:04:36
  

  New feature: "Large Window Brotli" (#640)
  
  * New feature: "Large Window Brotli"
  
  By setting special encoder/decoder flag it is now possible to extend
  LZ-window up to 30 bits; though produced stream will not be RFC7932
  compliant.
  
  Added new dictionary generator - "DSH". It combines speed of "Sieve"
  and quality of "DM". Plus utilities to prepare train corpora
  (remove unique strings).
  
  Improved compression ratio: now two sub-blocks could be stitched:
  the last copy command could be extended to span the next sub-block.
  
  Fixed compression ineffectiveness caused by floating numbers rounding and
  wrong cost heuristic.
  
  Other C changes:
   - combined / moved `context.h` to `common`
   - moved transforms to `common`
   - unified some aspects of code formatting
   - added an abstraction for encoder (static) dictionary
   - moved default allocator/deallocator functions to `common`
  
  brotli CLI:
   - window size is auto-adjusted if not specified explicitly
  
  Java:
   - added "eager" decoding both to JNI wrapper and pure decoder
   - huge speed-up of `DictionaryData` initialization
  
  * Add dictionaryless compressed dictionary
  
  * Fix `sources.lst`
  
  * Fix `sources.lst` and add a note that `libtool` is also required.
  
  * Update setup.py
  
  * Fix `EagerStreamTest`
  
  * Fix BUILD file
  
  * Add missing `libdivsufsort` dependency
  
  * Fix "unused parameter" warning.
  

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• research/deorummolae.h

• #ifndef BROTLI_RESEARCH_DEORUMMOLAE_H_
  #define BROTLI_RESEARCH_DEORUMMOLAE_H_
  
  #include <cstddef>
  #include <cstdint>
  #include <string>
  #include <vector>
  
  /* log2(maximal number of files). Value 6 provides some speedups. */
  #define DM_LOG_MAX_FILES 6
  
  /* Non tunable definitions. */
  #define DM_MAX_FILES (1 << DM_LOG_MAX_FILES)
  
  /**
   * Generate a dictionary for given samples.
   *
   * @param dictionary_size_limit maximal dictionary size
   * @param sample_sizes vector with sample sizes
   * @param sample_data concatenated samples
   * @return generated dictionary
   */
  std::string DM_generate(size_t dictionary_size_limit,
      const std::vector<size_t>& sample_sizes, const uint8_t* sample_data);
  
  #endif  // BROTLI_RESEARCH_DEORUMMOLAE_H_
  

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