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95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/*
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Copyright 2011 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Author: lode.vandevenne@gmail.com (Lode Vandevenne)
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Author: jyrki.alakuijala@gmail.com (Jyrki Alakuijala)
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*/
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#ifndef ZOPFLI_ZOPFLI_H_
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#define ZOPFLI_ZOPFLI_H_
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#include <stddef.h>
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#include <stdlib.h> /* for size_t */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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Options used throughout the program.
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*/
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typedef struct ZopfliOptions {
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/* Whether to print output */
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int verbose;
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/* Whether to print more detailed output */
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int verbose_more;
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/*
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Maximum amount of times to rerun forward and backward pass to optimize LZ77
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compression cost. Good values: 10, 15 for small files, 5 for files over
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several MB in size or it will be too slow.
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*/
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int numiterations;
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/*
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If true, splits the data in multiple deflate blocks with optimal choice
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for the block boundaries. Block splitting gives better compression. Default:
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true (1).
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*/
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int blocksplitting;
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/*
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No longer used, left for compatibility.
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*/
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int blocksplittinglast;
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/*
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Maximum amount of blocks to split into (0 for unlimited, but this can give
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extreme results that hurt compression on some files). Default value: 15.
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*/
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int blocksplittingmax;
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} ZopfliOptions;
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/* Initializes options with default values. */
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void ZopfliInitOptions(ZopfliOptions* options);
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/* Output format */
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typedef enum {
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ZOPFLI_FORMAT_GZIP,
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ZOPFLI_FORMAT_ZLIB,
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ZOPFLI_FORMAT_DEFLATE
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} ZopfliFormat;
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/*
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Compresses according to the given output format and appends the result to the
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output.
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options: global program options
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output_type: the output format to use
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out: pointer to the dynamic output array to which the result is appended. Must
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be freed after use
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outsize: pointer to the dynamic output array size
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*/
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void ZopfliCompress(const ZopfliOptions* options, ZopfliFormat output_type,
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const unsigned char* in, size_t insize,
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unsigned char** out, size_t* outsize);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* ZOPFLI_ZOPFLI_H_ */
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