src/lib/lzma.c

   1 /*
   2  * coreboot interface to memory-saving variant of LZMA decoder
   3  *
   4  * Copyright (C) 2006 Carl-Daniel Hailfinger
   5  * Released under the GNU GPL v2 or later
   6  *
   7  * Parts of this file are based on C/7zip/Compress/LZMA_C/LzmaTest.c from the LZMA
   8  * SDK 4.42, which is written and distributed to public domain by Igor Pavlov.
   9  *
  10  */
  11
  12 #include <console/console.h>
  13 #include <string.h>
  14 #include <lib.h>
  15 #include <timestamp.h>
  16
  17 #include "lzmadecode.h"
  18
  19 size_t ulzman(const void *src, size_t srcn, void *dst, size_t dstn)
  20 {
  21         unsigned char properties[LZMA_PROPERTIES_SIZE];
  22         const int data_offset = LZMA_PROPERTIES_SIZE + 8;
  23         UInt32 outSize;
  24         SizeT inProcessed;
  25         SizeT outProcessed;
  26         int res;
  27         CLzmaDecoderState state;
  28         SizeT mallocneeds;
  29         MAYBE_STATIC unsigned char scratchpad[15980];
  30         const unsigned char *cp;
  31
  32         memcpy(properties, src, LZMA_PROPERTIES_SIZE);
  33         /* The outSize in LZMA stream is a 64bit integer stored in little-endian
  34          * (ref: lzma.cc@LZMACompress: put_64). To prevent accessing by
  35          * unaligned memory address and to load in correct endianness, read each
  36          * byte and re-construct. */
  37         cp = src + LZMA_PROPERTIES_SIZE;
  38         outSize = cp[3] << 24 | cp[2] << 16 | cp[1] << 8 | cp[0];
  39         if (LzmaDecodeProperties(&state.Properties, properties,
  40                                  LZMA_PROPERTIES_SIZE) != LZMA_RESULT_OK) {
  41                 printk(BIOS_WARNING, "lzma: Incorrect stream properties.\n");
  42                 return 0;
  43         }
  44         mallocneeds = (LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
  45         if (mallocneeds > 15980) {
  46                 printk(BIOS_WARNING, "lzma: Decoder scratchpad too small!\n");
  47                 return 0;
  48         }
  49         state.Probs = (CProb *)scratchpad;
  50         res = LzmaDecode(&state, src + data_offset, srcn - data_offset,
  51                          &inProcessed, dst, outSize, &outProcessed);
  52         if (res != 0) {
  53                 printk(BIOS_WARNING, "lzma: Decoding error = %d\n", res);
  54                 return 0;
  55         }
  56         return outProcessed;
  57 }