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