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 125