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 <log.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
36static void *SzAlloc(void *p, size_t size) { return malloc(size); }
37static void SzFree(void *p, void *address) { free(address); }
38
39int lzmaBuffToBuffDecompress(unsigned char *outStream, SizeT *uncompressedSize,
40			     const 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    schedule();
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