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80fb7693 | 1 | // $Id$ |
2 | ||
3 | //************************************************************************** | |
4 | //* This file is property of and copyright by the ALICE HLT Project * | |
5 | //* ALICE Experiment at CERN, All rights reserved. * | |
6 | //* * | |
7 | //* Primary Authors: Matthias Richter <Matthias.Richter@ift.uib.no> * | |
8 | //* for The ALICE HLT Project. * | |
9 | //* * | |
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 | //************************************************************************** | |
18 | ||
19 | /// @file AliHLTDataDeflater.cxx | |
20 | /// @author Matthias Richter, Timm Steinbeck | |
21 | /// @date 2011-08-10 | |
22 | /// @brief Data deflater class storing only necessary bits | |
23 | /// @note Code original from AliHLTTPCCompModelDeflater | |
24 | ||
25 | #include "AliHLTDataDeflater.h" | |
26 | #include "AliHLTErrorGuard.h" | |
27 | #include <memory> | |
28 | #include <algorithm> | |
29 | #include <iostream> | |
30 | ||
31 | /** ROOT macro for the implementation of ROOT specific class methods */ | |
32 | ClassImp(AliHLTDataDeflater) | |
33 | ||
34 | AliHLTDataDeflater::AliHLTDataDeflater() | |
35 | : AliHLTLogging() | |
36 | , fBitDataCurrentWord(0) | |
37 | , fBitDataCurrentPosInWord(0) | |
38 | , fBitDataCurrentOutput(NULL) | |
39 | , fBitDataCurrentOutputStart(NULL) | |
40 | , fBitDataCurrentOutputEnd(NULL) | |
41 | { | |
42 | // see header file for class documentation | |
43 | // or | |
44 | // refer to README to build package | |
45 | // or | |
46 | // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt | |
47 | } | |
48 | ||
49 | AliHLTDataDeflater::~AliHLTDataDeflater() | |
50 | { | |
51 | // destructor | |
52 | Clear(); | |
53 | } | |
54 | ||
55 | int AliHLTDataDeflater::InitBitDataOutput( AliHLTUInt8_t* output, UInt_t outputSize) | |
56 | { | |
57 | // init the target buffer | |
58 | fBitDataCurrentWord = 0; | |
59 | fBitDataCurrentPosInWord = 7; | |
60 | fBitDataCurrentOutput = fBitDataCurrentOutputStart = output; | |
61 | fBitDataCurrentOutputEnd = output+outputSize; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | AliHLTUInt8_t AliHLTDataDeflater::GetCurrentOutputByte( Int_t offset ) const | |
67 | { | |
68 | // get the current byte | |
69 | if ( !offset ) | |
70 | return fBitDataCurrentWord; | |
71 | else | |
72 | return *(fBitDataCurrentOutput+offset); | |
73 | } | |
74 | ||
75 | bool AliHLTDataDeflater::OutputBit( AliHLTUInt32_t const & value ) | |
76 | { | |
77 | // write one bit to the current byte and position | |
78 | if ( fBitDataCurrentOutput>=fBitDataCurrentOutputEnd ) | |
79 | return false; | |
80 | fBitDataCurrentWord |= (value & 1) << fBitDataCurrentPosInWord; | |
81 | if ( fBitDataCurrentPosInWord ) | |
82 | fBitDataCurrentPosInWord--; | |
83 | else { | |
84 | *fBitDataCurrentOutput = fBitDataCurrentWord; | |
85 | fBitDataCurrentPosInWord = 7; | |
86 | fBitDataCurrentOutput++; | |
87 | fBitDataCurrentWord = 0; | |
88 | } | |
89 | return true; | |
90 | } | |
91 | ||
92 | bool AliHLTDataDeflater::OutputBits( AliHLTUInt64_t const & value, UInt_t const & bitCount ) | |
93 | { | |
94 | // write bit pattern to the current byte and position | |
95 | if ( bitCount>64 ) { | |
96 | HLTFatal( "Internal error: Attempt to write more than 64 bits (%u)", (unsigned)bitCount ); | |
97 | return false; | |
98 | } | |
99 | UInt_t bitsToWrite=bitCount; | |
100 | UInt_t curBitCount; | |
101 | while ( bitsToWrite>0 ) { | |
102 | if ( fBitDataCurrentOutput>=fBitDataCurrentOutputEnd ) | |
103 | return false; | |
104 | #if 1 | |
105 | if ( bitsToWrite >= fBitDataCurrentPosInWord+1 ) | |
106 | curBitCount = fBitDataCurrentPosInWord+1; | |
107 | else | |
108 | curBitCount = bitsToWrite; | |
109 | fBitDataCurrentWord |= ( (value >> (bitsToWrite-curBitCount)) & ((1<<curBitCount)-1) ) << (fBitDataCurrentPosInWord+1-curBitCount); | |
110 | if ( fBitDataCurrentPosInWord < curBitCount ) | |
111 | { | |
112 | *fBitDataCurrentOutput = fBitDataCurrentWord; | |
113 | fBitDataCurrentPosInWord = 7; | |
114 | fBitDataCurrentOutput++; | |
115 | fBitDataCurrentWord = 0; | |
116 | } | |
117 | else | |
118 | fBitDataCurrentPosInWord -= curBitCount; | |
119 | bitsToWrite -= curBitCount; | |
120 | ||
121 | #else | |
122 | AliHLTUInt8_t curValue; | |
123 | if ( bitsToWrite>=8 ) | |
124 | { | |
125 | curBitCount=8; | |
126 | curValue = (value >> bitsToWrite-8) & 0xFF; | |
127 | bitsToWrite -= 8; | |
128 | } | |
129 | else | |
130 | { | |
131 | curBitCount=bitsToWrite; | |
132 | curValue = value & ( (1<<bitsToWrite)-1 ); | |
133 | bitsToWrite = 0; | |
134 | } | |
135 | if ( fBitDataCurrentPosInWord+1>curBitCount ) | |
136 | { | |
137 | fBitDataCurrentWord |= curValue << (fBitDataCurrentPosInWord-curBitCount+1); | |
138 | fBitDataCurrentPosInWord -= curBitCount; | |
139 | } | |
140 | else if ( fBitDataCurrentPosInWord+1==curBitCount ) | |
141 | { | |
142 | fBitDataCurrentWord |= curValue; | |
143 | *fBitDataCurrentOutput = fBitDataCurrentWord; | |
144 | fBitDataCurrentPosInWord = 7; | |
145 | fBitDataCurrentOutput++; | |
146 | fBitDataCurrentWord = 0; | |
147 | } | |
148 | else | |
149 | { | |
150 | const UInt_t first = fBitDataCurrentPosInWord+1; // Number of bits for first block | |
151 | const UInt_t second = curBitCount-first; // Number of bits for second block | |
152 | fBitDataCurrentWord |= ( curValue >> second ) & ((1<<first)-1); | |
153 | *fBitDataCurrentOutput = fBitDataCurrentWord; | |
154 | fBitDataCurrentOutput++; | |
155 | if ( fBitDataCurrentOutput>=fBitDataCurrentOutputEnd ) | |
156 | return false; | |
157 | fBitDataCurrentWord = curValue & ((1<<second)-1) << (8-second); | |
158 | fBitDataCurrentPosInWord = 7-second; | |
159 | } | |
160 | #endif | |
161 | } | |
162 | return true; | |
163 | } | |
164 | ||
165 | void AliHLTDataDeflater::Pad8Bits() | |
166 | { | |
167 | // finish the current word | |
168 | if ( fBitDataCurrentPosInWord==7 ) | |
169 | return; | |
170 | *fBitDataCurrentOutput = fBitDataCurrentWord; | |
171 | fBitDataCurrentPosInWord = 7; | |
172 | fBitDataCurrentOutput++; | |
173 | fBitDataCurrentWord = 0; | |
174 | } | |
175 | ||
176 | bool AliHLTDataDeflater::OutputBytes( AliHLTUInt8_t const * data, UInt_t const & byteCount ) | |
177 | { | |
178 | // write sequence of bytes | |
179 | Pad8Bits(); | |
180 | if ( fBitDataCurrentOutput+byteCount>fBitDataCurrentOutputEnd ) | |
181 | return false; | |
182 | memcpy( fBitDataCurrentOutput, data, byteCount ); | |
183 | fBitDataCurrentOutput += byteCount; | |
184 | return true; | |
185 | } | |
186 | ||
187 | bool AliHLTDataDeflater::OutputParameterBits( int /*(parameterId*/, AliHLTUInt64_t const & /*value*/ ) | |
188 | { | |
189 | // write bit pattern of a member to the current byte and position | |
190 | ALIHLTERRORGUARD(1,"method needs to be implemented in child class"); | |
191 | return false; | |
192 | } | |
193 | ||
194 | void AliHLTDataDeflater::Clear(Option_t * /*option*/) | |
195 | { | |
196 | // internal cleanup | |
197 | } | |
198 | ||
199 | void AliHLTDataDeflater::Print(Option_t *option) const | |
200 | { | |
201 | // print info | |
202 | Print(cout, option); | |
203 | } | |
204 | ||
205 | void AliHLTDataDeflater::Print(ostream& out, Option_t */*option*/) const | |
206 | { | |
207 | // print to stream | |
208 | out << "AliHLTDataDeflater: " << endl; | |
209 | } | |
210 | ||
211 | ostream& operator<<(ostream &out, const AliHLTDataDeflater& me) | |
212 | { | |
213 | me.Print(out); | |
214 | return out; | |
215 | } |