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Diffstat (limited to '')
| -rw-r--r-- | htp/lzma/LzmaDec.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/htp/lzma/LzmaDec.h b/htp/lzma/LzmaDec.h new file mode 100644 index 0000000..20b5228 --- /dev/null +++ b/htp/lzma/LzmaDec.h @@ -0,0 +1,234 @@ +/* LzmaDec.h -- LZMA Decoder
+2018-04-21 : Igor Pavlov : Public domain */
+
+#ifndef __LZMA_DEC_H
+#define __LZMA_DEC_H
+
+#include "7zTypes.h"
+
+EXTERN_C_BEGIN
+
+/* #define _LZMA_PROB32 */
+/* _LZMA_PROB32 can increase the speed on some CPUs,
+ but memory usage for CLzmaDec::probs will be doubled in that case */
+
+typedef
+#ifdef _LZMA_PROB32
+ UInt32
+#else
+ UInt16
+#endif
+ CLzmaProb;
+
+
+/* ---------- LZMA Properties ---------- */
+
+#define LZMA_PROPS_SIZE 5
+
+typedef struct _CLzmaProps
+{
+ Byte lc;
+ Byte lp;
+ Byte pb;
+ Byte _pad_;
+ UInt32 dicSize;
+} CLzmaProps;
+
+/* LzmaProps_Decode - decodes properties
+Returns:
+ SZ_OK
+ SZ_ERROR_UNSUPPORTED - Unsupported properties
+*/
+
+SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size);
+
+
+/* ---------- LZMA Decoder state ---------- */
+
+/* LZMA_REQUIRED_INPUT_MAX = number of required input bytes for worst case.
+ Num bits = log2((2^11 / 31) ^ 22) + 26 < 134 + 26 = 160; */
+
+#define LZMA_REQUIRED_INPUT_MAX 20
+
+typedef struct
+{
+ /* Don't change this structure. ASM code can use it. */
+ CLzmaProps prop;
+ CLzmaProb *probs;
+ CLzmaProb *probs_1664;
+ Byte *dic;
+ SizeT dicBufSize;
+ SizeT dicPos;
+ const Byte *buf;
+ UInt32 range;
+ UInt32 code;
+ UInt32 processedPos;
+ UInt32 checkDicSize;
+ UInt32 reps[4];
+ UInt32 state;
+ UInt32 remainLen;
+
+ UInt32 numProbs;
+ unsigned tempBufSize;
+ Byte tempBuf[LZMA_REQUIRED_INPUT_MAX];
+} CLzmaDec;
+
+#define LzmaDec_Construct(p) { (p)->dic = NULL; (p)->probs = NULL; }
+
+void LzmaDec_Init(CLzmaDec *p);
+
+/* There are two types of LZMA streams:
+ - Stream with end mark. That end mark adds about 6 bytes to compressed size.
+ - Stream without end mark. You must know exact uncompressed size to decompress such stream. */
+
+typedef enum
+{
+ LZMA_FINISH_ANY, /* finish at any point */
+ LZMA_FINISH_END /* block must be finished at the end */
+} ELzmaFinishMode;
+
+/* ELzmaFinishMode has meaning only if the decoding reaches output limit !!!
+
+ You must use LZMA_FINISH_END, when you know that current output buffer
+ covers last bytes of block. In other cases you must use LZMA_FINISH_ANY.
+
+ If LZMA decoder sees end marker before reaching output limit, it returns SZ_OK,
+ and output value of destLen will be less than output buffer size limit.
+ You can check status result also.
+
+ You can use multiple checks to test data integrity after full decompression:
+ 1) Check Result and "status" variable.
+ 2) Check that output(destLen) = uncompressedSize, if you know real uncompressedSize.
+ 3) Check that output(srcLen) = compressedSize, if you know real compressedSize.
+ You must use correct finish mode in that case. */
+
+typedef enum
+{
+ LZMA_STATUS_NOT_SPECIFIED, /* use main error code instead */
+ LZMA_STATUS_FINISHED_WITH_MARK, /* stream was finished with end mark. */
+ LZMA_STATUS_NOT_FINISHED, /* stream was not finished */
+ LZMA_STATUS_NEEDS_MORE_INPUT, /* you must provide more input bytes */
+ LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK /* there is probability that stream was finished without end mark */
+} ELzmaStatus;
+
+/* ELzmaStatus is used only as output value for function call */
+
+
+/* ---------- Interfaces ---------- */
+
+/* There are 3 levels of interfaces:
+ 1) Dictionary Interface
+ 2) Buffer Interface
+ 3) One Call Interface
+ You can select any of these interfaces, but don't mix functions from different
+ groups for same object. */
+
+
+/* There are two variants to allocate state for Dictionary Interface:
+ 1) LzmaDec_Allocate / LzmaDec_Free
+ 2) LzmaDec_AllocateProbs / LzmaDec_FreeProbs
+ You can use variant 2, if you set dictionary buffer manually.
+ For Buffer Interface you must always use variant 1.
+
+LzmaDec_Allocate* can return:
+ SZ_OK
+ SZ_ERROR_MEM - Memory allocation error
+ SZ_ERROR_UNSUPPORTED - Unsupported properties
+*/
+
+SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAllocPtr alloc);
+void LzmaDec_FreeProbs(CLzmaDec *p, ISzAllocPtr alloc);
+
+SRes LzmaDec_Allocate(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAllocPtr alloc);
+void LzmaDec_Free(CLzmaDec *p, ISzAllocPtr alloc);
+
+/* ---------- Dictionary Interface ---------- */
+
+/* You can use it, if you want to eliminate the overhead for data copying from
+ dictionary to some other external buffer.
+ You must work with CLzmaDec variables directly in this interface.
+
+ STEPS:
+ LzmaDec_Construct()
+ LzmaDec_Allocate()
+ for (each new stream)
+ {
+ LzmaDec_Init()
+ while (it needs more decompression)
+ {
+ LzmaDec_DecodeToDic()
+ use data from CLzmaDec::dic and update CLzmaDec::dicPos
+ }
+ }
+ LzmaDec_Free()
+*/
+
+/* LzmaDec_DecodeToDic
+
+ The decoding to internal dictionary buffer (CLzmaDec::dic).
+ You must manually update CLzmaDec::dicPos, if it reaches CLzmaDec::dicBufSize !!!
+
+finishMode:
+ It has meaning only if the decoding reaches output limit (dicLimit).
+ LZMA_FINISH_ANY - Decode just dicLimit bytes.
+ LZMA_FINISH_END - Stream must be finished after dicLimit.
+
+Returns:
+ SZ_OK
+ status:
+ LZMA_STATUS_FINISHED_WITH_MARK
+ LZMA_STATUS_NOT_FINISHED
+ LZMA_STATUS_NEEDS_MORE_INPUT
+ LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
+ SZ_ERROR_DATA - Data error
+*/
+
+SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit,
+ const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status, SizeT memlimit);
+
+
+/* ---------- Buffer Interface ---------- */
+
+/* It's zlib-like interface.
+ See LzmaDec_DecodeToDic description for information about STEPS and return results,
+ but you must use LzmaDec_DecodeToBuf instead of LzmaDec_DecodeToDic and you don't need
+ to work with CLzmaDec variables manually.
+
+finishMode:
+ It has meaning only if the decoding reaches output limit (*destLen).
+ LZMA_FINISH_ANY - Decode just destLen bytes.
+ LZMA_FINISH_END - Stream must be finished after (*destLen).
+*/
+
+SRes LzmaDec_DecodeToBuf(CLzmaDec *p, Byte *dest, SizeT *destLen,
+ const Byte *src, SizeT *srcLen, ELzmaFinishMode finishMode, ELzmaStatus *status, SizeT memlimit);
+
+
+/* ---------- One Call Interface ---------- */
+
+/* LzmaDecode
+
+finishMode:
+ It has meaning only if the decoding reaches output limit (*destLen).
+ LZMA_FINISH_ANY - Decode just destLen bytes.
+ LZMA_FINISH_END - Stream must be finished after (*destLen).
+
+Returns:
+ SZ_OK
+ status:
+ LZMA_STATUS_FINISHED_WITH_MARK
+ LZMA_STATUS_NOT_FINISHED
+ LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
+ SZ_ERROR_DATA - Data error
+ SZ_ERROR_MEM - Memory allocation error
+ SZ_ERROR_UNSUPPORTED - Unsupported properties
+ SZ_ERROR_INPUT_EOF - It needs more bytes in input buffer (src).
+*/
+
+SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
+ const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,
+ ELzmaStatus *status, ISzAllocPtr alloc);
+
+EXTERN_C_END
+
+#endif
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