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/* 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_ */
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