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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* coreboot interface to memory-saving variant of LZMA decoder
*
* Copyright (C) 2006 Carl-Daniel Hailfinger
*
* Parts of this file are based on C/7zip/Compress/LZMA_C/LzmaTest.c from the
* LZMA SDK 4.42, which is written and distributed to public domain by Igor
* Pavlov.
*
*/
#include <console/console.h>
#include <string.h>
#include <lib.h>
#include "lzmadecode.h"
size_t ulzman(const void *src, size_t srcn, void *dst, size_t dstn)
{
unsigned char properties[LZMA_PROPERTIES_SIZE];
const int data_offset = LZMA_PROPERTIES_SIZE + 8;
UInt32 outSize;
SizeT inProcessed;
SizeT outProcessed;
int res;
CLzmaDecoderState state;
SizeT mallocneeds;
static unsigned char scratchpad[15980];
const unsigned char *cp;
if (srcn < data_offset) {
printk(BIOS_WARNING, "lzma: Input too small.\n");
return 0;
}
memcpy(properties, src, LZMA_PROPERTIES_SIZE);
/* The outSize in LZMA stream is a 64bit integer stored in little-endian
* (ref: lzma.cc@LZMACompress: put_64). To prevent accessing by
* unaligned memory address and to load in correct endianness, read each
* byte and re-construct. */
cp = src + LZMA_PROPERTIES_SIZE;
outSize = cp[3] << 24 | cp[2] << 16 | cp[1] << 8 | cp[0];
if (outSize > dstn)
outSize = dstn;
if (LzmaDecodeProperties(&state.Properties, properties,
LZMA_PROPERTIES_SIZE) != LZMA_RESULT_OK) {
printk(BIOS_WARNING, "lzma: Incorrect stream properties.\n");
return 0;
}
mallocneeds = (LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
if (mallocneeds > 15980) {
printk(BIOS_WARNING, "lzma: Decoder scratchpad too small!\n");
return 0;
}
state.Probs = (CProb *)scratchpad;
res = LzmaDecode(&state, src + data_offset, srcn - data_offset,
&inProcessed, dst, outSize, &outProcessed);
if (res != 0) {
printk(BIOS_WARNING, "lzma: Decoding error = %d\n", res);
return 0;
}
return outProcessed;
}
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