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1 | /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. * | |
2 | * See cxx source for full Copyright notice */ | |
3 | ||
4 | ////////////////////////////////////////////////////// | |
5 | // Class for Compression and Decompression // | |
6 | ////////////////////////////////////////////////////// | |
7 | ||
8 | ||
9 | #ifndef AliTPCCOMPRESSION_H | |
10 | #define AliTPCCOMPRESSION_H | |
11 | ||
12 | #ifdef __CINT__ | |
13 | class fstream; | |
14 | #else | |
15 | #include "Riostream.h" | |
16 | #endif | |
17 | ||
18 | class AliTPCHNode; | |
19 | class AliTPCHTable; | |
20 | ||
21 | class AliTPCCompression:public TObject{ | |
22 | public: | |
23 | AliTPCCompression(); | |
24 | virtual ~AliTPCCompression(){;} | |
25 | AliTPCCompression(const AliTPCCompression &source); // copy constructor | |
26 | AliTPCCompression& operator=(const AliTPCCompression &source); // ass. op. | |
27 | Int_t CompressDataOptTables(Int_t NumTable,const char* fSource,const char* fDest); | |
28 | //This method is used to compress an Altro file using a set of general table previously calculated and | |
29 | //stored as a sequence of txt file. | |
30 | Int_t DecompressDataOptTables(Int_t NumTables,const char* fname,char* fDest="SourceDecompressed.dat"); | |
31 | //This method is used to decompress a file compressed using the CompressDataOptTable method | |
32 | //It expects a set of table used for compressing the file in the same directory of the compressed file | |
33 | Int_t Decompress(AliTPCHNode *RootNode[],const Int_t NumTables,char* PointBuffer,UInt_t BufferSize,UShort_t out[],UInt_t &dim); | |
34 | //This method is used to decompress data stored in a char* buffer | |
35 | Int_t FillTables(const char* fSource,AliTPCHTable* table[],const Int_t NumTables); | |
36 | //This method is used to compute the frequencies of the symbols in the source file | |
37 | Int_t CreateTables(const char* fSource,const Int_t NumTables); | |
38 | //This method is used to create and store the tables | |
39 | Int_t CreateTableFormula(Double_t beta,UInt_t M,Int_t dim,Int_t Type); | |
40 | //This method is used to create and store the Bunch length or Time Gap Table using a formula | |
41 | void SetVerbose(Int_t val){fVerbose=val;} | |
42 | //This method is used to set up the verbose level | |
43 | // 0 ==> No output messages are displayed | |
44 | // 1 ==> Some output messages are displayed during the running | |
45 | // 2 ==> A complete output is displayed | |
46 | void ReadAltroFormat(char* fileOut,char* fileIn)const; | |
47 | //This method is used to read an Altro file and generate a text file containing the same information | |
48 | //It's is useful for debugging | |
49 | Int_t CreateTablesFromTxtFiles(Int_t NumTable); | |
50 | //This method creates a set of binary tables starting from a set of txt tables | |
51 | Int_t DestroyTables(AliTPCHNode *RootNode[],const Int_t NumTables); | |
52 | //This methods is use to deallocate the memory used by Huffman trees | |
53 | void CreateTreesFromFile(AliTPCHNode *RootNode[],const Int_t NumTables); | |
54 | //This method is like the previous one but the tables are stored in binary files | |
55 | //It is used in the decompression phase (DecompressDataOptTables()) | |
56 | private: | |
57 | Int_t StoreTables(AliTPCHTable* table[],const Int_t NumTable); | |
58 | //This method is used to store an array of tables in a sequence of binary files | |
59 | //Each file contains the Size of the table (number of words) and for each word contains the correspondent | |
60 | //codeword and codelength | |
61 | Int_t RetrieveTables(AliTPCHTable* table[],Int_t NumTable); | |
62 | //This method is used to retrieve an array of tables from a sequence of binary files created using | |
63 | //the previous method | |
64 | void DeleteHuffmanTree(AliTPCHNode* node); | |
65 | //This method is used to delete an Huffman tree | |
66 | void VisitHuffmanTree(AliTPCHNode* node); | |
67 | //This method realizes an in order visit of a binary tree | |
68 | void NextTable(Int_t Val,Int_t &NextTableType,Int_t &BunchLen,Int_t &Count)const; | |
69 | //This method is used to deduce which is the next table that as to be used to interpret the next value | |
70 | //reading the Altro format | |
71 | void StoreValue(UInt_t val,UChar_t len); | |
72 | //This method is used to store a value in the compressed file | |
73 | UInt_t Mirror(UInt_t val,UChar_t len)const; | |
74 | //This method is used to get the specular value of a given value | |
75 | //for instance the specular value of 12345 is 54321 | |
76 | void Flush(); | |
77 | //This method is used to complete and store the buffer in the output file when it isn't completely full | |
78 | UInt_t ReadWord(Int_t NumberOfBit); | |
79 | //this method is used to read a specified number of bits from the compressed file | |
80 | UInt_t ReadWordBuffer(Int_t NumberOfBit); | |
81 | //this method is used to read a specified number of bits from the compressed memory buffer | |
82 | void ReadTrailer(Int_t &WordsNumber,Int_t &PadNumber,Int_t &RowNumber,Int_t &SecNumberr,Bool_t Memory); | |
83 | //This method is used to read the trailer | |
84 | UInt_t GetDecodedWord(AliTPCHNode* root,Bool_t Memory); | |
85 | //This method is used to get a decoded word from the compressed file | |
86 | ||
87 | fstream f; // f is the logical name for the compressed and uncompressed file | |
88 | ofstream fStat; // Logical name for the Statistics file | |
89 | UInt_t fBuffer; // buffer | |
90 | Int_t fDimBuffer; // buffer dimension (32 bit) | |
91 | Int_t fFreeBitsBuffer; // number of free bits inside the buffer | |
92 | Int_t fReadBits; // number of bit read | |
93 | UInt_t fPos; // current file position | |
94 | Int_t fVerbose; // verbose level (0 silent, !=0 output messages) | |
95 | UInt_t fFillWords; // Number of hexadecimally words (2AA pattern) inside a pad data block | |
96 | char* fPointBuffer; //pointer to the compressed raw data | |
97 | ClassDef(AliTPCCompression,1) | |
98 | }; | |
99 | #endif |