fb25e53b4f
Strip out Sort Transform from Libbsc copy. Reduce Libbsc memory use. Avoid redundant adler32 of data block in Libbsc.
111 lines
4.4 KiB
C
111 lines
4.4 KiB
C
/*-----------------------------------------------------------*/
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/* Block Sorting, Lossless Data Compression Library. */
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/* Interface to data preprocessing filters */
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/*-----------------------------------------------------------*/
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/*--
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This file is a part of bsc and/or libbsc, a program and a library for
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lossless, block-sorting data compression.
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Copyright (c) 2009-2012 Ilya Grebnov <ilya.grebnov@gmail.com>
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See file AUTHORS for a full list of contributors.
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The bsc and libbsc is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The bsc and libbsc is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the bsc and libbsc. If not, see http://www.gnu.org/licenses/.
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Please see the files COPYING and COPYING.LIB for full copyright information.
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See also the bsc and libbsc web site:
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http://libbsc.com/ for more information.
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--*/
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#ifndef _LIBBSC_FILTERS_H
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#define _LIBBSC_FILTERS_H
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#define LIBBSC_CONTEXTS_FOLLOWING 1
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#define LIBBSC_CONTEXTS_PRECEDING 2
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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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* Autodetects segments for better compression of heterogeneous files.
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* @param input - the input memory block of n bytes.
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* @param n - the length of the input memory block.
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* @param segments - the output array of segments of k elements size.
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* @param k - the size of the output segments array.
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* @param features - the set of additional features.
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* @return The number of segments if no error occurred, error code otherwise.
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*/
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int bsc_detect_segments(const unsigned char * input, int n, int * segments, int k, int features);
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/**
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* Autodetects order of contexts for better compression of binary files.
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* @param input - the input memory block of n bytes.
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* @param n - the length of the input memory block.
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* @param features - the set of additional features.
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* @return The detected contexts order if no error occurred, error code otherwise.
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*/
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int bsc_detect_contextsorder(const unsigned char * input, int n, int features);
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/**
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* Reverses memory block to change order of contexts.
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* @param T - the input/output memory block of n bytes.
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* @param n - the length of the memory block.
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* @param features - the set of additional features.
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* @return LIBBSC_NO_ERROR if no error occurred, error code otherwise.
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*/
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int bsc_reverse_block(unsigned char * T, int n, int features);
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/**
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* Autodetects record size for better compression of multimedia files.
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* @param input - the input memory block of n bytes.
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* @param n - the length of the input memory block.
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* @param features - the set of additional features.
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* @return The size of record if no error occurred, error code otherwise.
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*/
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int bsc_detect_recordsize(const unsigned char * input, int n, int features);
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/**
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* Reorders memory block for specific size of record (Forward transform).
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* @param T - the input/output memory block of n bytes.
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* @param n - the length of the memory block.
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* @param recordSize - the size of record.
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* @param features - the set of additional features.
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* @return LIBBSC_NO_ERROR if no error occurred, error code otherwise.
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*/
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int bsc_reorder_forward(unsigned char * T, int n, int recordSize, int features);
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/**
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* Reorders memory block for specific size of record (Reverse transform).
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* @param T - the input/output memory block of n bytes.
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* @param n - the length of the memory block.
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* @param recordSize - the size of record.
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* @param features - the set of additional features.
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* @return LIBBSC_NO_ERROR if no error occurred, error code otherwise.
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*/
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int bsc_reorder_reverse(unsigned char * T, int n, int recordSize, int features);
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#ifdef __cplusplus
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}
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#endif
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#endif
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/*-------------------------------------------------*/
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/* End filters.h */
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/*-------------------------------------------------*/
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