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

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• 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`

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• c/enc/compress_fragment.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 one-pass processing: when we find a backward
     match, we immediately emit the corresponding command and literal codes to
     the bit stream. */
  
  #ifndef BROTLI_ENC_COMPRESS_FRAGMENT_H_
  #define BROTLI_ENC_COMPRESS_FRAGMENT_H_
  
  #include "../common/platform.h"
  #include <brotli/types.h>
  #include "./memory.h"
  
  #if defined(__cplusplus) || defined(c_plusplus)
  extern "C" {
  #endif
  
  /* 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.
  
     "cmd_depth" and "cmd_bits" contain the command and distance prefix codes
     (see comment in encode.h) used for the encoding of this input fragment.
     If "is_last" is 0, they are updated to reflect the statistics
     of this input fragment, to be used for the encoding of the next fragment.
  
     "*cmd_code_numbits" is the number of bits of the compressed representation
     of the command and distance prefix codes, and "cmd_code" is an array of
     at least "(*cmd_code_numbits + 7) >> 3" size that contains the compressed
     command and distance prefix codes. If "is_last" is 0, these are also
     updated to represent the updated "cmd_depth" and "cmd_bits".
  
     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: All elements in "table[0..table_size-1]" are initialized to zero.
     REQUIRES: "table_size" is an odd (9, 11, 13, 15) power of two
     OUTPUT: maximal copy distance <= |input_size|
     OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */
  BROTLI_INTERNAL void BrotliCompressFragmentFast(MemoryManager* m,
                                                  const uint8_t* input,
                                                  size_t input_size,
                                                  BROTLI_BOOL is_last,
                                                  int* table, size_t table_size,
                                                  uint8_t cmd_depth[128],
                                                  uint16_t cmd_bits[128],
                                                  size_t* cmd_code_numbits,
                                                  uint8_t* cmd_code,
                                                  size_t* storage_ix,
                                                  uint8_t* storage);
  
  #if defined(__cplusplus) || defined(c_plusplus)
  }  /* extern "C" */
  #endif
  
  #endif  /* BROTLI_ENC_COMPRESS_FRAGMENT_H_ */
  

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