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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