1 /* LzmaDec.h -- LZMA Decoder
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2 2009-02-07 : Igor Pavlov : Public domain */
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13 /* #define _LZMA_PROB32 */
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14 /* _LZMA_PROB32 can increase the speed on some CPUs,
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15 but memory usage for CLzmaDec::probs will be doubled in that case */
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18 #define CLzmaProb UInt32
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20 #define CLzmaProb UInt16
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24 /* ---------- LZMA Properties ---------- */
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26 #define LZMA_PROPS_SIZE 5
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28 typedef struct _CLzmaProps
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30 unsigned lc, lp, pb;
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34 /* LzmaProps_Decode - decodes properties
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37 SZ_ERROR_UNSUPPORTED - Unsupported properties
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40 SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size);
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43 /* ---------- LZMA Decoder state ---------- */
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45 /* LZMA_REQUIRED_INPUT_MAX = number of required input bytes for worst case.
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46 Num bits = log2((2^11 / 31) ^ 22) + 26 < 134 + 26 = 160; */
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48 #define LZMA_REQUIRED_INPUT_MAX 20
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59 UInt32 processedPos;
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60 UInt32 checkDicSize;
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67 unsigned tempBufSize;
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68 Byte tempBuf[LZMA_REQUIRED_INPUT_MAX];
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71 #define LzmaDec_Construct(p) { (p)->dic = 0; (p)->probs = 0; }
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73 void LzmaDec_Init(CLzmaDec *p);
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75 /* There are two types of LZMA streams:
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76 0) Stream with end mark. That end mark adds about 6 bytes to compressed size.
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77 1) Stream without end mark. You must know exact uncompressed size to decompress such stream. */
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81 LZMA_FINISH_ANY, /* finish at any point */
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82 LZMA_FINISH_END /* block must be finished at the end */
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85 /* ELzmaFinishMode has meaning only if the decoding reaches output limit !!!
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87 You must use LZMA_FINISH_END, when you know that current output buffer
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88 covers last bytes of block. In other cases you must use LZMA_FINISH_ANY.
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90 If LZMA decoder sees end marker before reaching output limit, it returns SZ_OK,
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91 and output value of destLen will be less than output buffer size limit.
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92 You can check status result also.
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94 You can use multiple checks to test data integrity after full decompression:
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95 1) Check Result and "status" variable.
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96 2) Check that output(destLen) = uncompressedSize, if you know real uncompressedSize.
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97 3) Check that output(srcLen) = compressedSize, if you know real compressedSize.
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98 You must use correct finish mode in that case. */
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102 LZMA_STATUS_NOT_SPECIFIED, /* use main error code instead */
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103 LZMA_STATUS_FINISHED_WITH_MARK, /* stream was finished with end mark. */
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104 LZMA_STATUS_NOT_FINISHED, /* stream was not finished */
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105 LZMA_STATUS_NEEDS_MORE_INPUT, /* you must provide more input bytes */
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106 LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK /* there is probability that stream was finished without end mark */
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109 /* ELzmaStatus is used only as output value for function call */
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112 /* ---------- Interfaces ---------- */
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114 /* There are 3 levels of interfaces:
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115 1) Dictionary Interface
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116 2) Buffer Interface
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117 3) One Call Interface
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118 You can select any of these interfaces, but don't mix functions from different
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119 groups for same object. */
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122 /* There are two variants to allocate state for Dictionary Interface:
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123 1) LzmaDec_Allocate / LzmaDec_Free
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124 2) LzmaDec_AllocateProbs / LzmaDec_FreeProbs
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125 You can use variant 2, if you set dictionary buffer manually.
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126 For Buffer Interface you must always use variant 1.
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128 LzmaDec_Allocate* can return:
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130 SZ_ERROR_MEM - Memory allocation error
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131 SZ_ERROR_UNSUPPORTED - Unsupported properties
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134 SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc);
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135 void LzmaDec_FreeProbs(CLzmaDec *p, ISzAlloc *alloc);
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137 SRes LzmaDec_Allocate(CLzmaDec *state, const Byte *prop, unsigned propsSize, ISzAlloc *alloc);
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138 void LzmaDec_Free(CLzmaDec *state, ISzAlloc *alloc);
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140 /* ---------- Dictionary Interface ---------- */
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142 /* You can use it, if you want to eliminate the overhead for data copying from
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143 dictionary to some other external buffer.
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144 You must work with CLzmaDec variables directly in this interface.
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149 for (each new stream)
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152 while (it needs more decompression)
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154 LzmaDec_DecodeToDic()
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155 use data from CLzmaDec::dic and update CLzmaDec::dicPos
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161 /* LzmaDec_DecodeToDic
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163 The decoding to internal dictionary buffer (CLzmaDec::dic).
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164 You must manually update CLzmaDec::dicPos, if it reaches CLzmaDec::dicBufSize !!!
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167 It has meaning only if the decoding reaches output limit (dicLimit).
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168 LZMA_FINISH_ANY - Decode just dicLimit bytes.
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169 LZMA_FINISH_END - Stream must be finished after dicLimit.
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174 LZMA_STATUS_FINISHED_WITH_MARK
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175 LZMA_STATUS_NOT_FINISHED
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176 LZMA_STATUS_NEEDS_MORE_INPUT
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177 LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
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178 SZ_ERROR_DATA - Data error
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181 SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit,
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182 const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
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185 /* ---------- Buffer Interface ---------- */
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187 /* It's zlib-like interface.
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188 See LzmaDec_DecodeToDic description for information about STEPS and return results,
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189 but you must use LzmaDec_DecodeToBuf instead of LzmaDec_DecodeToDic and you don't need
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190 to work with CLzmaDec variables manually.
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193 It has meaning only if the decoding reaches output limit (*destLen).
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194 LZMA_FINISH_ANY - Decode just destLen bytes.
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195 LZMA_FINISH_END - Stream must be finished after (*destLen).
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198 SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen,
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199 const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status);
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202 /* ---------- One Call Interface ---------- */
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207 It has meaning only if the decoding reaches output limit (*destLen).
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208 LZMA_FINISH_ANY - Decode just destLen bytes.
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209 LZMA_FINISH_END - Stream must be finished after (*destLen).
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214 LZMA_STATUS_FINISHED_WITH_MARK
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215 LZMA_STATUS_NOT_FINISHED
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216 LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
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217 SZ_ERROR_DATA - Data error
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218 SZ_ERROR_MEM - Memory allocation error
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219 SZ_ERROR_UNSUPPORTED - Unsupported properties
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220 SZ_ERROR_INPUT_EOF - It needs more bytes in input buffer (src).
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223 SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
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224 const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,
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225 ELzmaStatus *status, ISzAlloc *alloc);
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