1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Usefuls routines based on the LzmaTest.c file from LZMA SDK 4.65
4 *
5 * Copyright (C) 2007-2009 Industrie Dial Face S.p.A.
6 * Luigi 'Comio' Mantellini (luigi.mantellini@idf-hit.com)
7 *
8 * Copyright (C) 1999-2005 Igor Pavlov
9 */
10
11 /*
12 * LZMA_Alone stream format:
13 *
14 * uchar Properties[5]
15 * uint64 Uncompressed size
16 * uchar data[*]
17 *
18 */
19
20 #include <config.h>
21 #include <common.h>
22 #include <log.h>
23 #include <watchdog.h>
24
25 #ifdef CONFIG_LZMA
26
27 #define LZMA_PROPERTIES_OFFSET 0
28 #define LZMA_SIZE_OFFSET LZMA_PROPS_SIZE
29 #define LZMA_DATA_OFFSET LZMA_SIZE_OFFSET+sizeof(uint64_t)
30
31 #include "LzmaTools.h"
32 #include "LzmaDec.h"
33
34 #include <linux/string.h>
35 #include <malloc.h>
36
SzAlloc(void * p,size_t size)37 static void *SzAlloc(void *p, size_t size) { return malloc(size); }
SzFree(void * p,void * address)38 static void SzFree(void *p, void *address) { free(address); }
39
lzmaBuffToBuffDecompress(unsigned char * outStream,SizeT * uncompressedSize,unsigned char * inStream,SizeT length)40 int lzmaBuffToBuffDecompress (unsigned char *outStream, SizeT *uncompressedSize,
41 unsigned char *inStream, SizeT length)
42 {
43 int res = SZ_ERROR_DATA;
44 int i;
45 ISzAlloc g_Alloc;
46
47 SizeT outSizeFull = 0xFFFFFFFF; /* 4GBytes limit */
48 SizeT outProcessed;
49 SizeT outSize;
50 SizeT outSizeHigh;
51 ELzmaStatus state;
52 SizeT compressedSize = (SizeT)(length - LZMA_PROPS_SIZE);
53
54 debug ("LZMA: Image address............... 0x%p\n", inStream);
55 debug ("LZMA: Properties address.......... 0x%p\n", inStream + LZMA_PROPERTIES_OFFSET);
56 debug ("LZMA: Uncompressed size address... 0x%p\n", inStream + LZMA_SIZE_OFFSET);
57 debug ("LZMA: Compressed data address..... 0x%p\n", inStream + LZMA_DATA_OFFSET);
58 debug ("LZMA: Destination address......... 0x%p\n", outStream);
59
60 memset(&state, 0, sizeof(state));
61
62 outSize = 0;
63 outSizeHigh = 0;
64 /* Read the uncompressed size */
65 for (i = 0; i < 8; i++) {
66 unsigned char b = inStream[LZMA_SIZE_OFFSET + i];
67 if (i < 4) {
68 outSize += (UInt32)(b) << (i * 8);
69 } else {
70 outSizeHigh += (UInt32)(b) << ((i - 4) * 8);
71 }
72 }
73
74 outSizeFull = (SizeT)outSize;
75 if (sizeof(SizeT) >= 8) {
76 /*
77 * SizeT is a 64 bit uint => We can manage files larger than 4GB!
78 *
79 */
80 outSizeFull |= (((SizeT)outSizeHigh << 16) << 16);
81 } else if (outSizeHigh != 0 || (UInt32)(SizeT)outSize != outSize) {
82 /*
83 * SizeT is a 32 bit uint => We cannot manage files larger than
84 * 4GB! Assume however that all 0xf values is "unknown size" and
85 * not actually a file of 2^64 bits.
86 *
87 */
88 if (outSizeHigh != (SizeT)-1 || outSize != (SizeT)-1) {
89 debug ("LZMA: 64bit support not enabled.\n");
90 return SZ_ERROR_DATA;
91 }
92 }
93
94 debug("LZMA: Uncompresed size............ 0x%zx\n", outSizeFull);
95 debug("LZMA: Compresed size.............. 0x%zx\n", compressedSize);
96
97 g_Alloc.Alloc = SzAlloc;
98 g_Alloc.Free = SzFree;
99
100 /* Short-circuit early if we know the buffer can't hold the results. */
101 if (outSizeFull != (SizeT)-1 && *uncompressedSize < outSizeFull)
102 return SZ_ERROR_OUTPUT_EOF;
103
104 /* Decompress */
105 outProcessed = min(outSizeFull, *uncompressedSize);
106
107 WATCHDOG_RESET();
108
109 res = LzmaDecode(
110 outStream, &outProcessed,
111 inStream + LZMA_DATA_OFFSET, &compressedSize,
112 inStream, LZMA_PROPS_SIZE, LZMA_FINISH_END, &state, &g_Alloc);
113 *uncompressedSize = outProcessed;
114
115 debug("LZMA: Uncompressed ............... 0x%zx\n", outProcessed);
116
117 if (res != SZ_OK) {
118 return res;
119 }
120
121 return res;
122 }
123
124 #endif
125