1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 /*
4 * coreboot interface to memory-saving variant of LZMA decoder
5 *
6 * Copyright (C) 2006 Carl-Daniel Hailfinger
7 *
8 * Parts of this file are based on C/7zip/Compress/LZMA_C/LzmaTest.c from the
9 * LZMA SDK 4.42, which is written and distributed to public domain by Igor
10 * Pavlov.
11 *
12 */
13
14 #include <console/console.h>
15 #include <string.h>
16 #include <lib.h>
17
18 #include "lzmadecode.h"
19
ulzman(const void * src,size_t srcn,void * dst,size_t dstn)20 size_t ulzman(const void *src, size_t srcn, void *dst, size_t dstn)
21 {
22 unsigned char properties[LZMA_PROPERTIES_SIZE];
23 const int data_offset = LZMA_PROPERTIES_SIZE + 8;
24 UInt32 outSize;
25 SizeT inProcessed;
26 SizeT outProcessed;
27 int res;
28 CLzmaDecoderState state;
29 SizeT mallocneeds;
30 static unsigned char scratchpad[15980];
31 const unsigned char *cp;
32
33 if (srcn < data_offset) {
34 printk(BIOS_WARNING, "lzma: Input too small.\n");
35 return 0;
36 }
37
38 memcpy(properties, src, LZMA_PROPERTIES_SIZE);
39 /* The outSize in LZMA stream is a 64bit integer stored in little-endian
40 * (ref: lzma.cc@LZMACompress: put_64). To prevent accessing by
41 * unaligned memory address and to load in correct endianness, read each
42 * byte and re-construct. */
43 cp = src + LZMA_PROPERTIES_SIZE;
44 outSize = cp[3] << 24 | cp[2] << 16 | cp[1] << 8 | cp[0];
45 if (outSize > dstn)
46 outSize = dstn;
47 if (LzmaDecodeProperties(&state.Properties, properties,
48 LZMA_PROPERTIES_SIZE) != LZMA_RESULT_OK) {
49 printk(BIOS_WARNING, "lzma: Incorrect stream properties.\n");
50 return 0;
51 }
52 mallocneeds = (LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
53 if (mallocneeds > 15980) {
54 printk(BIOS_WARNING, "lzma: Decoder scratchpad too small!\n");
55 return 0;
56 }
57 state.Probs = (CProb *)scratchpad;
58 res = LzmaDecode(&state, src + data_offset, srcn - data_offset,
59 &inProcessed, dst, outSize, &outProcessed);
60 if (res != 0) {
61 printk(BIOS_WARNING, "lzma: Decoding error = %d\n", res);
62 return 0;
63 }
64 return outProcessed;
65 }
66