1 /*
2 * Usefuls routines based on the LzmaTest.c file from LZMA SDK 4.65
3 *
4 * Copyright (C) 2007-2009 Industrie Dial Face S.p.A.
5 * Luigi 'Comio' Mantellini (luigi.mantellini@idf-hit.com)
6 *
7 * Copyright (C) 1999-2005 Igor Pavlov
8 *
9 * SPDX-License-Identifier: GPL-2.0+
10 */
11
12 /*
13 * LZMA_Alone stream format:
14 *
15 * uchar Properties[5]
16 * uint64 Uncompressed size
17 * uchar data[*]
18 *
19 */
20
21 #include <config.h>
22 #include <common.h>
23 #include <watchdog.h>
24
25 #if CONFIG_IS_ENABLED(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
lzma_is_valid(const unsigned char * buf)40 int lzma_is_valid(const unsigned char *buf)
41 {
42 if (buf[0] != 0x5d || buf[1] || buf[2])
43 return 0;
44 if (buf[12] && buf[12] != 0xff)
45 return 0;
46
47 return 1;
48 }
49
lzmaBuffToBuffDecompress(unsigned char * outStream,SizeT * uncompressedSize,unsigned char * inStream,SizeT length)50 int lzmaBuffToBuffDecompress (unsigned char *outStream, SizeT *uncompressedSize,
51 unsigned char *inStream, SizeT length)
52 {
53 int res = SZ_ERROR_DATA;
54 int i;
55 ISzAlloc g_Alloc;
56
57 SizeT outSizeFull = 0xFFFFFFFF; /* 4GBytes limit */
58 SizeT outProcessed;
59 SizeT outSize;
60 SizeT outSizeHigh;
61 ELzmaStatus state;
62 SizeT compressedSize = (SizeT)(length - LZMA_PROPS_SIZE);
63
64 debug ("LZMA: Image address............... 0x%p\n", inStream);
65 debug ("LZMA: Properties address.......... 0x%p\n", inStream + LZMA_PROPERTIES_OFFSET);
66 debug ("LZMA: Uncompressed size address... 0x%p\n", inStream + LZMA_SIZE_OFFSET);
67 debug ("LZMA: Compressed data address..... 0x%p\n", inStream + LZMA_DATA_OFFSET);
68 debug ("LZMA: Destination address......... 0x%p\n", outStream);
69
70 memset(&state, 0, sizeof(state));
71
72 outSize = 0;
73 outSizeHigh = 0;
74 /* Read the uncompressed size */
75 for (i = 0; i < 8; i++) {
76 unsigned char b = inStream[LZMA_SIZE_OFFSET + i];
77 if (i < 4) {
78 outSize += (UInt32)(b) << (i * 8);
79 } else {
80 outSizeHigh += (UInt32)(b) << ((i - 4) * 8);
81 }
82 }
83
84 outSizeFull = (SizeT)outSize;
85 if (sizeof(SizeT) >= 8) {
86 /*
87 * SizeT is a 64 bit uint => We can manage files larger than 4GB!
88 *
89 */
90 outSizeFull |= (((SizeT)outSizeHigh << 16) << 16);
91 } else if (outSizeHigh != 0 || (UInt32)(SizeT)outSize != outSize) {
92 /*
93 * SizeT is a 32 bit uint => We cannot manage files larger than
94 * 4GB! Assume however that all 0xf values is "unknown size" and
95 * not actually a file of 2^64 bits.
96 *
97 */
98 if (outSizeHigh != (SizeT)-1 || outSize != (SizeT)-1) {
99 debug ("LZMA: 64bit support not enabled.\n");
100 return SZ_ERROR_DATA;
101 }
102 }
103
104 debug("LZMA: Uncompresed size............ 0x%zx\n", outSizeFull);
105 debug("LZMA: Compresed size.............. 0x%zx\n", compressedSize);
106
107 g_Alloc.Alloc = SzAlloc;
108 g_Alloc.Free = SzFree;
109
110 /* Short-circuit early if we know the buffer can't hold the results. */
111 if (outSizeFull != (SizeT)-1 && *uncompressedSize < outSizeFull)
112 return SZ_ERROR_OUTPUT_EOF;
113
114 /* Decompress */
115 outProcessed = min(outSizeFull, *uncompressedSize);
116
117 WATCHDOG_RESET();
118
119 res = LzmaDecode(
120 outStream, &outProcessed,
121 inStream + LZMA_DATA_OFFSET, &compressedSize,
122 inStream, LZMA_PROPS_SIZE, LZMA_FINISH_END, &state, &g_Alloc);
123 *uncompressedSize = outProcessed;
124
125 debug("LZMA: Uncompressed ............... 0x%zx\n", outProcessed);
126
127 if (res != SZ_OK) {
128 return res;
129 }
130
131 return res;
132 }
133
134 #endif
135