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