65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/*
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* coreboot interface to memory-saving variant of LZMA decoder
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*
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* Copyright (C) 2006 Carl-Daniel Hailfinger
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* Released under the GNU GPL v2 or later
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*
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* Parts of this file are based on C/7zip/Compress/LZMA_C/LzmaTest.c from the
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* LZMA SDK 4.42, which is written and distributed to public domain by Igor
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* Pavlov.
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*
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*/
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#include <console/console.h>
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#include <string.h>
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#include <lib.h>
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#include "lzmadecode.h"
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size_t ulzman(const void *src, size_t srcn, void *dst, size_t dstn)
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{
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unsigned char properties[LZMA_PROPERTIES_SIZE];
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const int data_offset = LZMA_PROPERTIES_SIZE + 8;
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UInt32 outSize;
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SizeT inProcessed;
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SizeT outProcessed;
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int res;
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CLzmaDecoderState state;
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SizeT mallocneeds;
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static unsigned char scratchpad[15980];
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const unsigned char *cp;
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if (srcn < data_offset) {
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printk(BIOS_WARNING, "lzma: Input too small.\n");
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return 0;
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}
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memcpy(properties, src, LZMA_PROPERTIES_SIZE);
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/* The outSize in LZMA stream is a 64bit integer stored in little-endian
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* (ref: lzma.cc@LZMACompress: put_64). To prevent accessing by
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* unaligned memory address and to load in correct endianness, read each
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* byte and re-construct. */
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cp = src + LZMA_PROPERTIES_SIZE;
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outSize = cp[3] << 24 | cp[2] << 16 | cp[1] << 8 | cp[0];
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if (outSize > dstn)
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outSize = dstn;
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if (LzmaDecodeProperties(&state.Properties, properties,
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LZMA_PROPERTIES_SIZE) != LZMA_RESULT_OK) {
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printk(BIOS_WARNING, "lzma: Incorrect stream properties.\n");
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return 0;
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}
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mallocneeds = (LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
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if (mallocneeds > 15980) {
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printk(BIOS_WARNING, "lzma: Decoder scratchpad too small!\n");
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return 0;
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}
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state.Probs = (CProb *)scratchpad;
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res = LzmaDecode(&state, src + data_offset, srcn - data_offset,
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&inProcessed, dst, outSize, &outProcessed);
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if (res != 0) {
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printk(BIOS_WARNING, "lzma: Decoding error = %d\n", res);
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return 0;
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}
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return outProcessed;
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}
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