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annotate libs/openctm/liblzma/LzmaDec.h @ 48:9ef9de80649c

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 29 Dec 2013 06:01:59 +0200
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nuclear@14 1 /* LzmaDec.h -- LZMA Decoder
nuclear@14 2 2008-10-04 : Igor Pavlov : Public domain */
nuclear@14 3
nuclear@14 4 #ifndef __LZMADEC_H
nuclear@14 5 #define __LZMADEC_H
nuclear@14 6
nuclear@14 7 #include "Types.h"
nuclear@14 8
nuclear@14 9 /* #define _LZMA_PROB32 */
nuclear@14 10 /* _LZMA_PROB32 can increase the speed on some CPUs,
nuclear@14 11 but memory usage for CLzmaDec::probs will be doubled in that case */
nuclear@14 12
nuclear@14 13 #ifdef _LZMA_PROB32
nuclear@14 14 #define CLzmaProb UInt32
nuclear@14 15 #else
nuclear@14 16 #define CLzmaProb UInt16
nuclear@14 17 #endif
nuclear@14 18
nuclear@14 19
nuclear@14 20 /* ---------- LZMA Properties ---------- */
nuclear@14 21
nuclear@14 22 #define LZMA_PROPS_SIZE 5
nuclear@14 23
nuclear@14 24 typedef struct _CLzmaProps
nuclear@14 25 {
nuclear@14 26 unsigned lc, lp, pb;
nuclear@14 27 UInt32 dicSize;
nuclear@14 28 } CLzmaProps;
nuclear@14 29
nuclear@14 30 /* LzmaProps_Decode - decodes properties
nuclear@14 31 Returns:
nuclear@14 32 SZ_OK
nuclear@14 33 SZ_ERROR_UNSUPPORTED - Unsupported properties
nuclear@14 34 */
nuclear@14 35
nuclear@14 36 SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size);
nuclear@14 37
nuclear@14 38
nuclear@14 39 /* ---------- LZMA Decoder state ---------- */
nuclear@14 40
nuclear@14 41 /* LZMA_REQUIRED_INPUT_MAX = number of required input bytes for worst case.
nuclear@14 42 Num bits = log2((2^11 / 31) ^ 22) + 26 < 134 + 26 = 160; */
nuclear@14 43
nuclear@14 44 #define LZMA_REQUIRED_INPUT_MAX 20
nuclear@14 45
nuclear@14 46 typedef struct
nuclear@14 47 {
nuclear@14 48 CLzmaProps prop;
nuclear@14 49 CLzmaProb *probs;
nuclear@14 50 Byte *dic;
nuclear@14 51 const Byte *buf;
nuclear@14 52 UInt32 range, code;
nuclear@14 53 SizeT dicPos;
nuclear@14 54 SizeT dicBufSize;
nuclear@14 55 UInt32 processedPos;
nuclear@14 56 UInt32 checkDicSize;
nuclear@14 57 unsigned state;
nuclear@14 58 UInt32 reps[4];
nuclear@14 59 unsigned remainLen;
nuclear@14 60 int needFlush;
nuclear@14 61 int needInitState;
nuclear@14 62 UInt32 numProbs;
nuclear@14 63 unsigned tempBufSize;
nuclear@14 64 Byte tempBuf[LZMA_REQUIRED_INPUT_MAX];
nuclear@14 65 } CLzmaDec;
nuclear@14 66
nuclear@14 67 #define LzmaDec_Construct(p) { (p)->dic = 0; (p)->probs = 0; }
nuclear@14 68
nuclear@14 69 void LzmaDec_Init(CLzmaDec *p);
nuclear@14 70
nuclear@14 71 /* There are two types of LZMA streams:
nuclear@14 72 0) Stream with end mark. That end mark adds about 6 bytes to compressed size.
nuclear@14 73 1) Stream without end mark. You must know exact uncompressed size to decompress such stream. */
nuclear@14 74
nuclear@14 75 typedef enum
nuclear@14 76 {
nuclear@14 77 LZMA_FINISH_ANY, /* finish at any point */
nuclear@14 78 LZMA_FINISH_END /* block must be finished at the end */
nuclear@14 79 } ELzmaFinishMode;
nuclear@14 80
nuclear@14 81 /* ELzmaFinishMode has meaning only if the decoding reaches output limit !!!
nuclear@14 82
nuclear@14 83 You must use LZMA_FINISH_END, when you know that current output buffer
nuclear@14 84 covers last bytes of block. In other cases you must use LZMA_FINISH_ANY.
nuclear@14 85
nuclear@14 86 If LZMA decoder sees end marker before reaching output limit, it returns SZ_OK,
nuclear@14 87 and output value of destLen will be less than output buffer size limit.
nuclear@14 88 You can check status result also.
nuclear@14 89
nuclear@14 90 You can use multiple checks to test data integrity after full decompression:
nuclear@14 91 1) Check Result and "status" variable.
nuclear@14 92 2) Check that output(destLen) = uncompressedSize, if you know real uncompressedSize.
nuclear@14 93 3) Check that output(srcLen) = compressedSize, if you know real compressedSize.
nuclear@14 94 You must use correct finish mode in that case. */
nuclear@14 95
nuclear@14 96 typedef enum
nuclear@14 97 {
nuclear@14 98 LZMA_STATUS_NOT_SPECIFIED, /* use main error code instead */
nuclear@14 99 LZMA_STATUS_FINISHED_WITH_MARK, /* stream was finished with end mark. */
nuclear@14 100 LZMA_STATUS_NOT_FINISHED, /* stream was not finished */
nuclear@14 101 LZMA_STATUS_NEEDS_MORE_INPUT, /* you must provide more input bytes */
nuclear@14 102 LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK /* there is probability that stream was finished without end mark */
nuclear@14 103 } ELzmaStatus;
nuclear@14 104
nuclear@14 105 /* ELzmaStatus is used only as output value for function call */
nuclear@14 106
nuclear@14 107
nuclear@14 108 /* ---------- Interfaces ---------- */
nuclear@14 109
nuclear@14 110 /* There are 3 levels of interfaces:
nuclear@14 111 1) Dictionary Interface
nuclear@14 112 2) Buffer Interface
nuclear@14 113 3) One Call Interface
nuclear@14 114 You can select any of these interfaces, but don't mix functions from different
nuclear@14 115 groups for same object. */
nuclear@14 116
nuclear@14 117
nuclear@14 118 /* There are two variants to allocate state for Dictionary Interface:
nuclear@14 119 1) LzmaDec_Allocate / LzmaDec_Free
nuclear@14 120 2) LzmaDec_AllocateProbs / LzmaDec_FreeProbs
nuclear@14 121 You can use variant 2, if you set dictionary buffer manually.
nuclear@14 122 For Buffer Interface you must always use variant 1.
nuclear@14 123
nuclear@14 124 LzmaDec_Allocate* can return:
nuclear@14 125 SZ_OK
nuclear@14 126 SZ_ERROR_MEM - Memory allocation error
nuclear@14 127 SZ_ERROR_UNSUPPORTED - Unsupported properties
nuclear@14 128 */
nuclear@14 129
nuclear@14 130 SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc);
nuclear@14 131 void LzmaDec_FreeProbs(CLzmaDec *p, ISzAlloc *alloc);
nuclear@14 132
nuclear@14 133 SRes LzmaDec_Allocate(CLzmaDec *state, const Byte *prop, unsigned propsSize, ISzAlloc *alloc);
nuclear@14 134 void LzmaDec_Free(CLzmaDec *state, ISzAlloc *alloc);
nuclear@14 135
nuclear@14 136 /* ---------- Dictionary Interface ---------- */
nuclear@14 137
nuclear@14 138 /* You can use it, if you want to eliminate the overhead for data copying from
nuclear@14 139 dictionary to some other external buffer.
nuclear@14 140 You must work with CLzmaDec variables directly in this interface.
nuclear@14 141
nuclear@14 142 STEPS:
nuclear@14 143 LzmaDec_Constr()
nuclear@14 144 LzmaDec_Allocate()
nuclear@14 145 for (each new stream)
nuclear@14 146 {
nuclear@14 147 LzmaDec_Init()
nuclear@14 148 while (it needs more decompression)
nuclear@14 149 {
nuclear@14 150 LzmaDec_DecodeToDic()
nuclear@14 151 use data from CLzmaDec::dic and update CLzmaDec::dicPos
nuclear@14 152 }
nuclear@14 153 }
nuclear@14 154 LzmaDec_Free()
nuclear@14 155 */
nuclear@14 156
nuclear@14 157 /* LzmaDec_DecodeToDic
nuclear@14 158
nuclear@14 159 The decoding to internal dictionary buffer (CLzmaDec::dic).
nuclear@14 160 You must manually update CLzmaDec::dicPos, if it reaches CLzmaDec::dicBufSize !!!
nuclear@14 161
nuclear@14 162 finishMode:
nuclear@14 163 It has meaning only if the decoding reaches output limit (dicLimit).
nuclear@14 164 LZMA_FINISH_ANY - Decode just dicLimit bytes.
nuclear@14 165 LZMA_FINISH_END - Stream must be finished after dicLimit.
nuclear@14 166
nuclear@14 167 Returns:
nuclear@14 168 SZ_OK
nuclear@14 169 status:
nuclear@14 170 LZMA_STATUS_FINISHED_WITH_MARK
nuclear@14 171 LZMA_STATUS_NOT_FINISHED
nuclear@14 172 LZMA_STATUS_NEEDS_MORE_INPUT
nuclear@14 173 LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
nuclear@14 174 SZ_ERROR_DATA - Data error
nuclear@14 175 */
nuclear@14 176
nuclear@14 177 SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit,
nuclear@14 178 const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
nuclear@14 179
nuclear@14 180
nuclear@14 181 /* ---------- Buffer Interface ---------- */
nuclear@14 182
nuclear@14 183 /* It's zlib-like interface.
nuclear@14 184 See LzmaDec_DecodeToDic description for information about STEPS and return results,
nuclear@14 185 but you must use LzmaDec_DecodeToBuf instead of LzmaDec_DecodeToDic and you don't need
nuclear@14 186 to work with CLzmaDec variables manually.
nuclear@14 187
nuclear@14 188 finishMode:
nuclear@14 189 It has meaning only if the decoding reaches output limit (*destLen).
nuclear@14 190 LZMA_FINISH_ANY - Decode just destLen bytes.
nuclear@14 191 LZMA_FINISH_END - Stream must be finished after (*destLen).
nuclear@14 192 */
nuclear@14 193
nuclear@14 194 SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen,
nuclear@14 195 const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
nuclear@14 196
nuclear@14 197
nuclear@14 198 /* ---------- One Call Interface ---------- */
nuclear@14 199
nuclear@14 200 /* LzmaDecode
nuclear@14 201
nuclear@14 202 finishMode:
nuclear@14 203 It has meaning only if the decoding reaches output limit (*destLen).
nuclear@14 204 LZMA_FINISH_ANY - Decode just destLen bytes.
nuclear@14 205 LZMA_FINISH_END - Stream must be finished after (*destLen).
nuclear@14 206
nuclear@14 207 Returns:
nuclear@14 208 SZ_OK
nuclear@14 209 status:
nuclear@14 210 LZMA_STATUS_FINISHED_WITH_MARK
nuclear@14 211 LZMA_STATUS_NOT_FINISHED
nuclear@14 212 LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
nuclear@14 213 SZ_ERROR_DATA - Data error
nuclear@14 214 SZ_ERROR_MEM - Memory allocation error
nuclear@14 215 SZ_ERROR_UNSUPPORTED - Unsupported properties
nuclear@14 216 SZ_ERROR_INPUT_EOF - It needs more bytes in input buffer (src).
nuclear@14 217 */
nuclear@14 218
nuclear@14 219 SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
nuclear@14 220 const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,
nuclear@14 221 ELzmaStatus *status, ISzAlloc *alloc);
nuclear@14 222
nuclear@14 223 #endif