mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* compression handling for cbfstool
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*
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* Copyright (C) 2009 coresystems GmbH
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* written by Patrick Georgi <patrick.georgi@coresystems.de>
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*
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* Adapted from code
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* Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>, released
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* under identical license terms
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "common.h"
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#include "lz4/lib/lz4frame.h"
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#include <commonlib/compression.h>
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static int lz4_compress(char *in, int in_len, char *out, int *out_len)
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{
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LZ4F_preferences_t prefs = {
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.compressionLevel = 20,
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.frameInfo = {
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.blockSizeID = max4MB,
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.blockMode = blockIndependent,
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.contentChecksumFlag = noContentChecksum,
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},
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};
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size_t worst_size = LZ4F_compressFrameBound(in_len, &prefs);
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void *bounce = malloc(worst_size);
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if (!bounce)
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return -1;
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*out_len = LZ4F_compressFrame(bounce, worst_size, in, in_len, &prefs);
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if (LZ4F_isError(*out_len) || *out_len >= in_len)
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return -1;
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memcpy(out, bounce, *out_len);
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return 0;
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}
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static int lz4_decompress(char *in, int in_len, char *out, int out_len,
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size_t *actual_size)
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{
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size_t result = ulz4fn(in, in_len, out, out_len);
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if (result == 0)
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return -1;
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if (actual_size != NULL)
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*actual_size = result;
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return 0;
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}
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static int lzma_compress(char *in, int in_len, char *out, int *out_len)
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{
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return do_lzma_compress(in, in_len, out, out_len);
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}
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static int lzma_decompress(char *in, int in_len, char *out, unused int out_len,
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size_t *actual_size)
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{
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return do_lzma_uncompress(out, out_len, in, in_len, actual_size);
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}
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static int none_compress(char *in, int in_len, char *out, int *out_len)
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{
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memcpy(out, in, in_len);
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*out_len = in_len;
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return 0;
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}
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static int none_decompress(char *in, int in_len, char *out, unused int out_len,
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size_t *actual_size)
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{
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memcpy(out, in, in_len);
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if (actual_size != NULL)
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*actual_size = in_len;
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return 0;
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}
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comp_func_ptr compression_function(enum comp_algo algo)
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{
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comp_func_ptr compress;
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switch (algo) {
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case CBFS_COMPRESS_NONE:
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compress = none_compress;
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break;
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case CBFS_COMPRESS_LZMA:
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compress = lzma_compress;
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break;
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case CBFS_COMPRESS_LZ4:
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compress = lz4_compress;
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break;
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default:
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ERROR("Unknown compression algorithm %d!\n", algo);
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return NULL;
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}
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return compress;
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}
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decomp_func_ptr decompression_function(enum comp_algo algo)
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{
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decomp_func_ptr decompress;
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switch (algo) {
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case CBFS_COMPRESS_NONE:
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decompress = none_decompress;
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break;
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case CBFS_COMPRESS_LZMA:
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decompress = lzma_decompress;
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break;
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case CBFS_COMPRESS_LZ4:
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decompress = lz4_decompress;
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break;
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default:
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ERROR("Unknown compression algorithm %d!\n", algo);
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return NULL;
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}
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return decompress;
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}
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