lib/lzma/LzmaTools.c

   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 #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
  37 static void *SzAlloc(void *p, size_t size) { return malloc(size); }
  38 static void SzFree(void *p, void *address) { free(address); }
  39
  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