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-rw-r--r--hash.h70
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-/*
-Copyright 2011 Google Inc. All Rights Reserved.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-
-Author: lode.vandevenne@gmail.com (Lode Vandevenne)
-Author: jyrki.alakuijala@gmail.com (Jyrki Alakuijala)
-*/
-
-/*
-The hash for ZopfliFindLongestMatch of lz77.c.
-*/
-
-#ifndef ZOPFLI_HASH_H_
-#define ZOPFLI_HASH_H_
-
-#include "util.h"
-
-typedef struct ZopfliHash {
- int* head; /* Hash value to index of its most recent occurance. */
- unsigned short* prev; /* Index to index of prev. occurance of same hash. */
- int* hashval; /* Index to hash value at this index. */
- int val; /* Current hash value. */
-
-#ifdef ZOPFLI_HASH_SAME_HASH
- /* Fields with similar purpose as the above hash, but for the second hash with
- a value that is calculated differently. */
- int* head2; /* Hash value to index of its most recent occurance. */
- unsigned short* prev2; /* Index to index of prev. occurance of same hash. */
- int* hashval2; /* Index to hash value at this index. */
- int val2; /* Current hash value. */
-#endif
-
-#ifdef ZOPFLI_HASH_SAME
- unsigned short* same; /* Amount of repetitions of same byte after this .*/
-#endif
-} ZopfliHash;
-
-/* Allocates and initializes all fields of ZopfliHash. */
-void ZopfliInitHash(size_t window_size, ZopfliHash* h);
-
-/* Frees all fields of ZopfliHash. */
-void ZopfliCleanHash(ZopfliHash* h);
-
-/*
-Updates the hash values based on the current position in the array. All calls
-to this must be made for consecutive bytes.
-*/
-void ZopfliUpdateHash(const unsigned char* array, size_t pos, size_t end,
- ZopfliHash* h);
-
-/*
-Prepopulates hash:
-Fills in the initial values in the hash, before ZopfliUpdateHash can be used
-correctly.
-*/
-void ZopfliWarmupHash(const unsigned char* array, size_t pos, size_t end,
- ZopfliHash* h);
-
-#endif /* ZOPFLI_HASH_H_ */