kc3-lang/brotli/c/enc/compress_fragment_two_pass.h

• Show log

  Commit

• Hash : da254cff
  Author :
  Date : 2017-12-12T14:33:12
  

  Update (#630)
  
   * merge {dec|enc}/port.h into common/platform.h
   * fix one-shot q=10 1-byte input compression
   * fix some unprefixed definitions
   * make hashers host-endianness-independent
   * extract enc/params.h from enc/quality.h
   * fix API documentation / typos
   * improve `BrotliEncoderMaxCompressedSize`

Download

• c/enc/compress_fragment_two_pass.h

• /* Copyright 2015 Google Inc. All Rights Reserved.
  
     Distributed under MIT license.
     See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
  */
  
  /* Function for fast encoding of an input fragment, independently from the input
     history. This function uses two-pass processing: in the first pass we save
     the found backward matches and literal bytes into a buffer, and in the
     second pass we emit them into the bit stream using prefix codes built based
     on the actual command and literal byte histograms. */
  
  #ifndef BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
  #define BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
  
  #include "../common/platform.h"
  #include <brotli/types.h>
  #include "./memory.h"
  
  #if defined(__cplusplus) || defined(c_plusplus)
  extern "C" {
  #endif
  
  static const size_t kCompressFragmentTwoPassBlockSize = 1 << 17;
  
  /* Compresses "input" string to the "*storage" buffer as one or more complete
     meta-blocks, and updates the "*storage_ix" bit position.
  
     If "is_last" is 1, emits an additional empty last meta-block.
  
     REQUIRES: "input_size" is greater than zero, or "is_last" is 1.
     REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24).
     REQUIRES: "command_buf" and "literal_buf" point to at least
                kCompressFragmentTwoPassBlockSize long arrays.
     REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
     REQUIRES: "table_size" is a power of two
     OUTPUT: maximal copy distance <= |input_size|
     OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */
  BROTLI_INTERNAL void BrotliCompressFragmentTwoPass(MemoryManager* m,
                                                     const uint8_t* input,
                                                     size_t input_size,
                                                     BROTLI_BOOL is_last,
                                                     uint32_t* command_buf,
                                                     uint8_t* literal_buf,
                                                     int* table,
                                                     size_t table_size,
                                                     size_t* storage_ix,
                                                     uint8_t* storage);
  
  #if defined(__cplusplus) || defined(c_plusplus)
  }  /* extern "C" */
  #endif
  
  #endif  /* BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ */
  

Download