]>
Commit | Line | Data |
---|---|---|
2e9f335b | 1 | /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. * |
2 | * See cxx source for full Copyright notice */ | |
3 | ||
4 | ////////////////////////////////////////////////////// | |
a79660fb | 5 | // Class for Compression and Decompression // |
2e9f335b | 6 | ////////////////////////////////////////////////////// |
7 | ||
8 | ||
9 | #ifndef AliTPCCOMPRESSION_H | |
10 | #define AliTPCCOMPRESSION_H | |
11 | ||
f8aae377 | 12 | #ifdef __CINT__ |
13 | class fstream; | |
14 | #else | |
15 | #include "Riostream.h" | |
16 | #endif | |
17 | ||
2e9f335b | 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. | |
2e9f335b | 27 | Int_t CompressDataOptTables(Int_t NumTable,const char* fSource,const char* fDest); |
a79660fb | 28 | //This method is used to compress an Altro file using a set of general table previously calculated and |
c9bd9d3d | 29 | //stored as a sequence of txt file. |
5fe3851e | 30 | Int_t DecompressDataOptTables(Int_t NumTables,const char* fname,const char* fDest="SourceDecompressed.dat"); |
a79660fb | 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 | |
09f6432c | 33 | Int_t Decompress(AliTPCHNode *RootNode[],Int_t NumTables,char* PointBuffer,UInt_t BufferSize,UShort_t out[],UInt_t &dim); |
c9bd9d3d | 34 | //This method is used to decompress data stored in a char* buffer |
09f6432c | 35 | Int_t FillTables(const char* fSource,AliTPCHTable* table[],Int_t NumTables); |
a79660fb | 36 | //This method is used to compute the frequencies of the symbols in the source file |
09f6432c | 37 | Int_t CreateTables(const char* fSource,Int_t NumTables); |
a79660fb | 38 | //This method is used to create and store the tables |
0b3c7dfc | 39 | Int_t CreateTableFormula(Double_t beta,UInt_t M,Int_t dim,Int_t Type); |
9f992f70 | 40 | //This method is used to create and store the Bunch length or Time Gap Table using a formula |
a79660fb | 41 | void SetVerbose(Int_t val){fVerbose=val;} |
2e9f335b | 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 | |
a79660fb | 46 | void ReadAltroFormat(char* fileOut,char* fileIn)const; |
2e9f335b | 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 | |
9f992f70 | 49 | Int_t CreateTablesFromTxtFiles(Int_t NumTable); |
50 | //This method creates a set of binary tables starting from a set of txt tables | |
09f6432c | 51 | Int_t DestroyTables(AliTPCHNode *RootNode[],Int_t NumTables); |
c9bd9d3d | 52 | //This methods is use to deallocate the memory used by Huffman trees |
1d98347a | 53 | Int_t CreateTreesFromFile(AliTPCHNode *RootNode[],Int_t NumTables); |
c9bd9d3d | 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()) | |
2e9f335b | 56 | private: |
a79660fb | 57 | Int_t StoreTables(AliTPCHTable* table[],const Int_t NumTable); |
2e9f335b | 58 | //This method is used to store an array of tables in a sequence of binary files |
a79660fb | 59 | //Each file contains the Size of the table (number of words) and for each word contains the correspondent |
2e9f335b | 60 | //codeword and codelength |
2e9f335b | 61 | Int_t RetrieveTables(AliTPCHTable* table[],Int_t NumTable); |
a79660fb | 62 | //This method is used to retrieve an array of tables from a sequence of binary files created using |
63 | //the previous method | |
2e9f335b | 64 | void DeleteHuffmanTree(AliTPCHNode* node); |
a79660fb | 65 | //This method is used to delete an Huffman tree |
2e9f335b | 66 | void VisitHuffmanTree(AliTPCHNode* node); |
a79660fb | 67 | //This method realizes an in order visit of a binary tree |
a79660fb | 68 | void NextTable(Int_t Val,Int_t &NextTableType,Int_t &BunchLen,Int_t &Count)const; |
2e9f335b | 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 | |
0b3c7dfc | 71 | void StoreValue(UInt_t val,UChar_t len); |
a79660fb | 72 | //This method is used to store a value in the compressed file |
0b3c7dfc | 73 | UInt_t Mirror(UInt_t val,UChar_t len)const; |
a79660fb | 74 | //This method is used to get the specular value of a given value |
75 | //for instance the specular value of 12345 is 54321 | |
2e9f335b | 76 | void Flush(); |
a79660fb | 77 | //This method is used to complete and store the buffer in the output file when it isn't completely full |
0b3c7dfc | 78 | UInt_t ReadWord(Int_t NumberOfBit); |
a79660fb | 79 | //this method is used to read a specified number of bits from the compressed file |
0b3c7dfc | 80 | UInt_t ReadWordBuffer(Int_t NumberOfBit); |
c9bd9d3d | 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); | |
a79660fb | 83 | //This method is used to read the trailer |
0b3c7dfc | 84 | UInt_t GetDecodedWord(AliTPCHNode* root,Bool_t Memory); |
a79660fb | 85 | //This method is used to get a decoded word from the compressed file |
86 | ||
2e9f335b | 87 | fstream f; // f is the logical name for the compressed and uncompressed file |
a79660fb | 88 | ofstream fStat; // Logical name for the Statistics file |
0b3c7dfc | 89 | UInt_t fBuffer; // buffer |
2e9f335b | 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 | |
0b3c7dfc | 93 | UInt_t fPos; // current file position |
a79660fb | 94 | Int_t fVerbose; // verbose level (0 silent, !=0 output messages) |
0b3c7dfc | 95 | UInt_t fFillWords; // Number of hexadecimally words (2AA pattern) inside a pad data block |
c9bd9d3d | 96 | char* fPointBuffer; //pointer to the compressed raw data |
2e9f335b | 97 | ClassDef(AliTPCCompression,1) |
98 | }; | |
99 | #endif |