kc3-lang/brotli/research/read_dist.h

• Show log

  Commit

• Hash : 9589396e
  Author :
  Date : 2016-09-15T11:34:19
  

  Add description of research tools.
  

Download

• research/read_dist.h

• /* Copyright 2016 Google Inc. All Rights Reserved.
     Author: vanickulin@google.com (Ivan Nikulin)
  
     Distributed under MIT license.
     See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
  */
  
  /* API for reading distances from *.dist file. */
  
  #include <cassert>
  #include <cstdio>
  
  #ifndef BROTLI_RESEARCH_READ_DIST_H_
  #define BROTLI_RESEARCH_READ_DIST_H_
  
  /* Reads backwards reference from .dist file. Sets all missing fields to -1.
     Returns false when EOF is met or input is corrupt. */
  bool ReadBackwardReference(FILE* fin, int* copy, int* pos, int* dist) {
    int c = getc(fin);
    if (c == EOF) return false;
    if (c == 0) {
      assert(fread(copy, sizeof(int), 1, fin) == 1);
      if ((c = getc(fin)) != 1) {
        ungetc(c, fin);
        *pos = *dist = -1;
      } else {
        assert(fread(pos, sizeof(int), 1, fin) == 1);
        assert(fread(dist, sizeof(int), 1, fin) == 1);
      }
    } else if (c != 1) {
      return false;
    } else {
      assert(fread(pos, sizeof(int), 1, fin) == 1);
      assert(fread(dist, sizeof(int), 1, fin) == 1);
      *copy = -1;
    }
    return true;
  }
  
  #endif  /* BROTLI_RESEARCH_READ_DIST_H_ */
  

Download