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