3 //**************************************************************************
4 //* This file is property of and copyright by the ALICE HLT Project *
5 //* ALICE Experiment at CERN, All rights reserved. *
7 //* Primary Authors: Matthias Richter <Matthias.Richter@ift.uib.no> *
8 //* for The ALICE HLT Project. *
10 //* Permission to use, copy, modify and distribute this software and its *
11 //* documentation strictly for non-commercial purposes is hereby granted *
12 //* without fee, provided that the above copyright notice appears in all *
13 //* copies and that both the copyright notice and this permission notice *
14 //* appear in the supporting documentation. The authors make no claims *
15 //* about the suitability of this software for any purpose. It is *
16 //* provided "as is" without express or implied warranty. *
17 //**************************************************************************
19 /// @file AliHLTDataInflaterHuffman.cxx
20 /// @author Matthias Richter
22 /// @brief Data inflater implementation for huffman encoded data
25 #include "AliHLTDataInflaterHuffman.h"
26 #include "AliHLTHuffman.h"
29 /** ROOT macro for the implementation of ROOT specific class methods */
30 ClassImp(AliHLTDataInflaterHuffman)
32 AliHLTDataInflaterHuffman::AliHLTDataInflaterHuffman()
33 : AliHLTDataInflater()
35 , fHuffmanCoderList(NULL)
36 , fCurrentParameter(-1)
41 // see header file for class documentation
43 // refer to README to build package
45 // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt
48 AliHLTDataInflaterHuffman::~AliHLTDataInflaterHuffman()
51 if (fHuffmanCoderList) delete fHuffmanCoderList;
52 fHuffmanCoderList=NULL;
55 int AliHLTDataInflaterHuffman::AddParameterDefinition(const char* name, unsigned bitLength)
57 /// search a parameter definition in the decoder configuration, and set the index
58 /// array, return reference id
59 /// TODO: this code is a copy of AliHLTDataDeflaterHuffman::AddParameterDefinition
60 /// make a common base class
61 if (!name) return -EINVAL;
62 if (!fHuffmanCoderList) return -ENODEV;
63 TObject* pObj=fHuffmanCoderList->FindObject(name);
65 HLTError("can not find decoder of id '%s'", name);
68 AliHLTHuffman* pHuffman=dynamic_cast<AliHLTHuffman*>(pObj);
70 HLTError("object %s has wrong type, expected AliHLTHuffman", name);
73 if (pHuffman->GetMaxBits()!=bitLength) {
74 HLTError("mismatch in bitlengt: can not use decoder %s of length %d for encoding of %d bits", pHuffman->GetName(), pHuffman->GetMaxBits(), bitLength);
78 fHuffmanCoders.push_back(pHuffman);
79 return fHuffmanCoders.size()-1;
82 int AliHLTDataInflaterHuffman::InitDecoders(TList* decoderlist)
84 /// init list of decoders
85 /// expects to be an external pointer, valid throughout the livetime of
87 /// TODO: this code is a copy of AliHLTDataDeflaterHuffman::InitDecoders
88 /// make a common base class
89 if (!decoderlist) return -EINVAL;
90 if (!fHuffmanCoderList) {
91 fHuffmanCoderList=new TList;
93 if (fHuffmanCoderList->GetEntries()>0 && fHuffmanCoderList->IsOwner()) {
94 HLTWarning("list of decoders owns already %d object(s), but disabling ownership now because of new external pointers");
97 if (!fHuffmanCoderList) return -ENOMEM;
98 fHuffmanCoderList->SetOwner(kFALSE);
99 TIter next(decoderlist);
101 while ((pObj=next())!=NULL) {
102 AliHLTHuffman* coder=NULL;
103 if ((coder=dynamic_cast<AliHLTHuffman*>(pObj))==NULL) continue;
104 if (fHuffmanCoderList->FindObject(pObj->GetName())) {
105 HLTError("duplicate entry of name '%s'", pObj->GetName());
108 fHuffmanCoderList->Add(pObj);
109 coder->InitMaxCodeLength();
112 return fHuffmanCoderList->GetEntries();
115 bool AliHLTDataInflaterHuffman::NextValue(AliHLTUInt64_t& value, AliHLTUInt32_t& length)
117 /// overloaded from AliHLTDataInflater
118 /// functions reads the sequence of parameters as defined by the decoder
119 /// list, than it starts at the first parameter again
122 if (fLegacyMode!=0) {
123 if ((++fCurrentParameter)>=(int)fHuffmanCoders.size()) fCurrentParameter=0;
126 if (fHuffmanCoders.size()==0 || fCurrentParameter<0) return false;
127 if (fInputLength<fHuffmanCoders[fCurrentParameter]->GetMaxCodeLength() ||
128 fHuffmanCoders[fCurrentParameter]->GetMaxCodeLength()==0)
130 AliHLTUInt64_t input=0;
131 AliHLTUInt32_t inputLength=64-fInputLength;
132 if (GetRemainingBitDataSizeBytes()<=sizeof(AliHLTUInt64_t)) {
133 inputLength=8*GetRemainingBitDataSizeBytes();
134 inputLength-=(7-GetCurrentBitInputPosition());
136 if (64-fInputLength<inputLength) inputLength=64-fInputLength;
137 if (!InputBits(input, inputLength)) return false;
138 input<<=(64-inputLength);
139 input>>=fInputLength;
141 fInputLength+=inputLength;
143 AliHLTUInt32_t codeLength=0;
144 if (!fHuffmanCoders[fCurrentParameter]->DecodeMSB(fInput, value, length, codeLength)) return false;
145 if (fInputLength<codeLength) {
146 HLTError("huffman decoder '%s' pretends to have %d bit(s) decoded, but only %d available",
147 fHuffmanCoders[fCurrentParameter]->GetName(), codeLength, fInputLength);
151 fInputLength-=codeLength;
156 void AliHLTDataInflaterHuffman::Print(Option_t* option) const
159 for (vector<AliHLTHuffman*>::const_iterator coder=fHuffmanCoders.begin();
160 coder!=fHuffmanCoders.end(); coder++) {
161 if (!*coder) continue;
162 (*coder)->Print(option);
166 void AliHLTDataInflaterHuffman::Clear(Option_t * option)
169 fCurrentParameter=-1;
173 if (strcmp(option, "all")==0) {
174 fHuffmanCoders.clear();
175 if (fHuffmanCoderList) delete fHuffmanCoderList;
176 fHuffmanCoderList=NULL;
179 AliHLTDataInflater::Clear(option);