/* * coreboot interface to memory-saving variant of LZMA decoder * * Copyright (C) 2006 Carl-Daniel Hailfinger * Released under the GNU GPL v2 or later * * 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; MAYBE_STATIC unsigned char scratchpad[15980]; const unsigned char *cp; 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; }