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