author | Jussi Ryoma <ext-jussi.s.ryoma@nokia.com> |
Fri, 27 Aug 2010 12:21:46 +0300 | |
changeset 3 | 045ade241ef5 |
parent 0 | 818e61de6cd1 |
permissions | -rw-r--r-- |
0
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1 |
/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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4 |
* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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#ifdef _MSC_VER |
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#pragma warning(disable: 4710) // function not inlined |
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#endif |
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#include <cassert> |
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#include "huffman.h" |
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//#include "errorhandler.h" |
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#include "farray.h" |
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/** |
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Recursive function to calculate the code lengths from the node tree |
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@internalComponent |
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@released |
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*/ |
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void HuffmanLengthsL(TUint32* aLengths,const TNode* aNodes,TInt aNode,TInt aLen) |
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{ |
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if (++aLen>Huffman::KMaxCodeLength) |
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throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANBUFFEROVERFLOWERROR); |
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const TNode& node=aNodes[aNode]; |
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TUint x=node.iLeft; |
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if (x&KLeaf) |
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aLengths[x&~KLeaf]=aLen; |
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else |
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HuffmanLengthsL(aLengths,aNodes,x,aLen); |
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x=node.iRight; |
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if (x&KLeaf) |
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aLengths[x&~KLeaf]=aLen; |
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else |
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HuffmanLengthsL(aLengths,aNodes,x,aLen); |
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} |
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/** |
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Function to Insert the {aCount,aValue} pair into the already sorted array of nodes |
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@internalComponent |
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@released |
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*/ |
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void InsertInOrder(TNode* aNodes, TInt aSize, TUint aCount, TInt aVal) |
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{ |
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// Uses Insertion sort following a binary search... |
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TInt l=0, r=aSize; |
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while (l < r) |
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{ |
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TInt m = (l+r) >> 1; |
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if (aNodes[m].iCount<aCount) |
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r=m; |
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else |
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l=m+1; |
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} |
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memmove(aNodes+l+1,aNodes+l,sizeof(TNode)*(aSize-l)); |
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aNodes[l].iCount=aCount; |
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aNodes[l].iRight=TUint16(aVal); |
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} |
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/** |
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Generate a Huffman code. |
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This generates a Huffman code for a given set of code frequencies. The output is a table of |
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code lengths which can be used to build canonincal encoding tables or decoding trees for use |
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with the TBitInput and TBitOutput classes. |
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Entries in the table with a frequency of zero will have a zero code length and thus no |
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associated huffman encoding. If each such symbol should have a maximum length encoding, they |
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must be given at least a frequency of 1. |
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|
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For an alphabet of n symbols, this algorithm has a transient memory overhead of 8n, and a |
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time complexity of O(n*log(n)). |
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|
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@param "const TUint32 aFrequency[]" The table of code frequencies |
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@param "TInt aNumCodes" The number of codes in the table |
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@param "TUint32 aHuffman[]" The table for the output code-length table. This must be the same |
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size as the frequency table, and can safely be the same table |
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|
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@leave "KErrNoMemory" If memory used for code generation cannot be allocated |
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@panic "USER ???" If the number of codes exceeds Huffman::KMaxCodes |
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*/ |
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void Huffman::HuffmanL(const TUint32 aFrequency[],TInt aNumCodes,TUint32 aHuffman[]) |
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{ |
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if(TUint(aNumCodes)>TUint(KMaxCodes)) |
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throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANTOOMANYCODESERROR); |
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|
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// Sort the values into decreasing order of frequency |
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TNode* nodes = new TNode[aNumCodes]; |
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|
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TInt lCount=0; |
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|
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106 |
for (TInt ii=0;ii<aNumCodes;++ii) |
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107 |
{ |
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108 |
TInt c=aFrequency[ii]; |
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109 |
if (c!=0) |
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110 |
InsertInOrder(nodes,lCount++,c,ii|KLeaf); |
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111 |
} |
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112 |
|
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113 |
// default code length is zero |
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114 |
memset(aHuffman,0,aNumCodes*sizeof(TUint32)); |
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115 |
|
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116 |
if (lCount==0) |
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117 |
{ |
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118 |
// no codes with frequency>0. No code has a length |
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119 |
} |
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120 |
else if (lCount==1) |
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121 |
{ |
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122 |
// special case for a single value (always encode as "0") |
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123 |
aHuffman[nodes[0].iRight&~KLeaf]=1; |
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124 |
} |
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125 |
else |
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126 |
{ |
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127 |
// Huffman algorithm: pair off least frequent nodes and reorder |
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128 |
do |
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129 |
{ |
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130 |
--lCount; |
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131 |
TUint c=nodes[lCount].iCount + nodes[lCount-1].iCount; |
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132 |
nodes[lCount].iLeft=nodes[lCount-1].iRight; |
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133 |
// re-order the leaves now to reflect new combined frequency 'c' |
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134 |
InsertInOrder(nodes,lCount-1,c,lCount); |
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135 |
} while (lCount>1); |
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136 |
// generate code lengths in aHuffman[] |
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137 |
HuffmanLengthsL(aHuffman,nodes,1,0); |
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138 |
} |
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|
139 |
|
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140 |
delete [] nodes; |
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|
141 |
|
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142 |
if(!IsValid(aHuffman,aNumCodes)) |
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143 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANINVALIDCODINGERROR); |
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144 |
} |
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|
145 |
|
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146 |
/** |
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147 |
Validate a Huffman encoding |
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148 |
|
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149 |
This verifies that a Huffman coding described by the code lengths is valid. In particular, |
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150 |
it ensures that no code exceeds the maximum length and that it is possible to generate a |
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151 |
canonical coding for the specified lengths. |
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152 |
|
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153 |
@param "const TUint32 aHuffman[]" The table of code lengths as generated by Huffman::HuffmanL() |
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154 |
@param "TInt aNumCodes" The number of codes in the table |
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155 |
|
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156 |
@return True if the code is valid, otherwise false |
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157 |
*/ |
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158 |
TBool Huffman::IsValid(const TUint32 aHuffman[],TInt aNumCodes) |
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159 |
{ |
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160 |
// The code is valid if one of the following holds: |
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161 |
// (a) the code exactly fills the 'code space' |
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162 |
// (b) there is only a single symbol with code length 1 |
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163 |
// (c) there are no encoded symbols |
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164 |
// |
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|
165 |
TUint remain=1<<KMaxCodeLength; |
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|
166 |
TInt totlen=0; |
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|
167 |
for (const TUint32* p=aHuffman+aNumCodes; p>aHuffman;) |
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|
168 |
{ |
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|
169 |
TInt len=*--p; |
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|
170 |
if (len>0) |
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|
171 |
{ |
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|
172 |
totlen+=len; |
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|
173 |
if (len>KMaxCodeLength) |
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|
174 |
return 0; |
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|
175 |
|
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|
176 |
TUint c=1<<(KMaxCodeLength-len); |
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|
177 |
if (c>remain) |
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|
178 |
return 0; |
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|
179 |
|
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|
180 |
remain-=c; |
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|
181 |
} |
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|
182 |
} |
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|
183 |
|
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|
184 |
return remain==0 || totlen<=1; |
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|
185 |
} |
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|
186 |
|
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|
187 |
/** |
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|
188 |
Create a canonical Huffman encoding table |
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|
189 |
|
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|
190 |
This generates the huffman codes used by TBitOutput::HuffmanL() to write huffman encoded data. |
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|
191 |
The input is table of code lengths, as generated by Huffman::HuffmanL() and must represent a |
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|
192 |
valid huffman code. |
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|
193 |
|
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|
194 |
@param "const TUint32 aHuffman[]" The table of code lengths as generated by Huffman::HuffmanL() |
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|
195 |
@param "TInt aNumCodes" The number of codes in the table |
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|
196 |
@param "TUint32 aEncodeTable[]" The table for the output huffman codes. This must be the same |
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|
197 |
size as the code-length table, and can safely be the same table. |
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|
198 |
|
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|
199 |
@panic "USER ???" If the provided code is not a valid Huffman coding |
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|
200 |
|
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|
201 |
@see IsValid() |
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|
202 |
@see HuffmanL() |
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203 |
*/ |
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|
204 |
void Huffman::Encoding(const TUint32 aHuffman[],TInt aNumCodes,TUint32 aEncodeTable[]) |
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205 |
{ |
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|
206 |
if (!IsValid(aHuffman,aNumCodes)) |
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|
207 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANINVALIDCODINGERROR); |
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|
208 |
|
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|
209 |
TFixedArray<TInt,KMaxCodeLength> lenCount; |
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|
210 |
lenCount.Reset(); |
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|
211 |
|
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|
212 |
TInt ii; |
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|
213 |
for (ii=0;ii<aNumCodes;++ii) |
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214 |
{ |
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215 |
TInt len=aHuffman[ii]-1; |
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216 |
if (len>=0) |
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217 |
++lenCount[len]; |
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218 |
} |
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219 |
|
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220 |
TFixedArray<TUint,KMaxCodeLength> nextCode; |
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TUint code=0; |
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for (ii=0;ii<KMaxCodeLength;++ii) |
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223 |
{ |
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224 |
code<<=1; |
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225 |
nextCode[ii]=code; |
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226 |
code+=lenCount[ii]; |
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227 |
} |
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228 |
|
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for (ii=0;ii<aNumCodes;++ii) |
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230 |
{ |
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231 |
TInt len=aHuffman[ii]; |
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232 |
if (len==0) |
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233 |
aEncodeTable[ii]=0; |
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234 |
else |
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235 |
{ |
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aEncodeTable[ii] = (nextCode[len-1]<<(KMaxCodeLength-len))|(len<<KMaxCodeLength); |
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++nextCode[len-1]; |
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238 |
} |
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239 |
} |
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240 |
} |
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241 |
|
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242 |
/** |
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243 |
The encoding table for the externalised code |
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244 |
@internalComponent |
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245 |
@released |
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246 |
*/ |
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const TUint32 HuffmanEncoding[]= |
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248 |
{ |
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249 |
0x10000000, |
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250 |
0x1c000000, |
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251 |
0x12000000, |
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252 |
0x1d000000, |
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253 |
0x26000000, |
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254 |
0x26800000, |
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255 |
0x2f000000, |
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256 |
0x37400000, |
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257 |
0x37600000, |
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258 |
0x37800000, |
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259 |
0x3fa00000, |
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260 |
0x3fb00000, |
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261 |
0x3fc00000, |
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262 |
0x3fd00000, |
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263 |
0x47e00000, |
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264 |
0x47e80000, |
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265 |
0x47f00000, |
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266 |
0x4ff80000, |
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267 |
0x57fc0000, |
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268 |
0x5ffe0000, |
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269 |
0x67ff0000, |
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270 |
0x77ff8000, |
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271 |
0x7fffa000, |
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272 |
0x7fffb000, |
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273 |
0x7fffc000, |
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274 |
0x7fffd000, |
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275 |
0x7fffe000, |
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276 |
0x87fff000, |
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277 |
0x87fff800 |
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278 |
}; |
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279 |
|
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280 |
|
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281 |
const TInt KHuffTerminate=0x0001; |
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282 |
const TUint32 KBranch1=sizeof(TUint32)<<16; |
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283 |
|
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284 |
/** |
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285 |
Function to write the subtree below aPtr and return the head |
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286 |
*/ |
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287 |
TUint32* HuffmanSubTree(TUint32* aPtr,const TUint32* aValue,TUint32** aLevel) |
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288 |
{ |
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289 |
TUint32* l=*aLevel++; |
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290 |
if (l>aValue) |
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291 |
{ |
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292 |
TUint32* sub0=HuffmanSubTree(aPtr,aValue,aLevel); // 0-tree first |
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aPtr=HuffmanSubTree(sub0,aValue-(aPtr-sub0)-1,aLevel); // 1-tree |
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294 |
TInt branch0=(TUint8*)sub0-(TUint8*)(aPtr-1); |
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295 |
*--aPtr=KBranch1|branch0; |
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296 |
} |
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297 |
else if (l==aValue) |
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298 |
{ |
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299 |
TUint term0=*aValue--; // 0-term |
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300 |
aPtr=HuffmanSubTree(aPtr,aValue,aLevel); // 1-tree |
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301 |
*--aPtr=KBranch1|(term0>>16); |
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302 |
} |
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303 |
else // l<iNext |
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304 |
{ |
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305 |
TUint term0=*aValue--; // 0-term |
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306 |
TUint term1=*aValue--; |
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307 |
*--aPtr=(term1>>16<<16)|(term0>>16); |
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308 |
} |
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309 |
return aPtr; |
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310 |
} |
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|
311 |
|
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312 |
/** |
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313 |
Create a canonical Huffman decoding tree |
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314 |
|
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315 |
This generates the huffman decoding tree used by TBitInput::HuffmanL() to read huffman |
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316 |
encoded data. The input is table of code lengths, as generated by Huffman::HuffmanL() |
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317 |
and must represent a valid huffman code. |
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318 |
|
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319 |
@param "const TUint32 aHuffman[]" The table of code lengths as generated by Huffman::HuffmanL() |
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320 |
@param "TInt aNumCodes" The number of codes in the table |
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321 |
@param "TUint32 aDecodeTree[]" The space for the decoding tree. This must be the same |
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322 |
size as the code-length table, and can safely be the same memory |
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323 |
@param "TInt aSymbolBase" the base value for the output 'symbols' from the decoding tree, by default |
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|
324 |
this is zero. |
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|
325 |
|
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326 |
@panic "USER ???" If the provided code is not a valid Huffman coding |
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327 |
|
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328 |
@see IsValid() |
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329 |
@see HuffmanL() |
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330 |
*/ |
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|
331 |
void Huffman::Decoding(const TUint32 aHuffman[],TInt aNumCodes,TUint32 aDecodeTree[],TInt aSymbolBase) |
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332 |
{ |
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333 |
if(!IsValid(aHuffman,aNumCodes)) |
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|
334 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANINVALIDCODINGERROR); |
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|
335 |
|
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|
336 |
TFixedArray<TInt,KMaxCodeLength> counts; |
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337 |
counts.Reset(); |
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338 |
TInt codes=0; |
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339 |
TInt ii; |
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340 |
for (ii=0;ii<aNumCodes;++ii) |
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341 |
{ |
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|
342 |
TInt len=aHuffman[ii]; |
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343 |
aDecodeTree[ii]=len; |
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344 |
if (--len>=0) |
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345 |
{ |
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|
346 |
++counts[len]; |
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347 |
++codes; |
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348 |
} |
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349 |
} |
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|
350 |
|
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|
351 |
TFixedArray<TUint32*,KMaxCodeLength> level; |
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|
352 |
TUint32* lit=aDecodeTree+codes; |
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|
353 |
for (ii=0;ii<KMaxCodeLength;++ii) |
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|
354 |
{ |
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|
355 |
level[ii]=lit; |
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|
356 |
lit-=counts[ii]; |
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|
357 |
} |
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|
358 |
|
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|
359 |
aSymbolBase=(aSymbolBase<<17)+(KHuffTerminate<<16); |
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|
360 |
for (ii=0;ii<aNumCodes;++ii) |
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|
361 |
{ |
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|
362 |
TUint len=TUint8(aDecodeTree[ii]); |
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|
363 |
if (len) |
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|
364 |
*--level[len-1]|=(ii<<17)+aSymbolBase; |
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|
365 |
} |
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|
366 |
|
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|
367 |
if (codes==1) // codes==1 special case: incomplete tree |
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|
368 |
{ |
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|
369 |
TUint term=aDecodeTree[0]>>16; |
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|
370 |
aDecodeTree[0]=term|(term<<16); // 0- and 1-terminate at root |
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|
371 |
} |
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|
372 |
else if (codes>1) |
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|
373 |
HuffmanSubTree(aDecodeTree+codes-1,aDecodeTree+codes-1,&level[0]); |
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|
374 |
} |
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|
375 |
|
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|
376 |
/** |
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|
377 |
The decoding tree for the externalised code |
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|
378 |
*/ |
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|
379 |
const TUint32 HuffmanDecoding[]= |
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|
380 |
{ |
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|
381 |
0x0004006c, |
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|
382 |
0x00040064, |
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|
383 |
0x0004005c, |
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changeset
|
384 |
0x00040050, |
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changeset
|
385 |
0x00040044, |
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changeset
|
386 |
0x0004003c, |
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changeset
|
387 |
0x00040034, |
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changeset
|
388 |
0x00040021, |
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changeset
|
389 |
0x00040023, |
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changeset
|
390 |
0x00040025, |
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changeset
|
391 |
0x00040027, |
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changeset
|
392 |
0x00040029, |
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changeset
|
393 |
0x00040014, |
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changeset
|
394 |
0x0004000c, |
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changeset
|
395 |
0x00040035, |
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|
396 |
0x00390037, |
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changeset
|
397 |
0x00330031, |
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changeset
|
398 |
0x0004002b, |
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changeset
|
399 |
0x002f002d, |
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changeset
|
400 |
0x001f001d, |
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changeset
|
401 |
0x001b0019, |
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changeset
|
402 |
0x00040013, |
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changeset
|
403 |
0x00170015, |
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changeset
|
404 |
0x0004000d, |
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changeset
|
405 |
0x0011000f, |
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changeset
|
406 |
0x000b0009, |
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changeset
|
407 |
0x00070003, |
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changeset
|
408 |
0x00050001 |
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|
409 |
}; |
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changeset
|
410 |
|
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changeset
|
411 |
|
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changeset
|
412 |
/** |
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|
413 |
Restore a canonical huffman encoding from a bit stream |
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changeset
|
414 |
|
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|
415 |
The encoding must have been stored using Huffman::ExternalizeL(). The resulting |
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|
416 |
code-length table can be used to create an encoding table using Huffman::Encoding() |
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|
417 |
or a decoding tree using Huffman::Decoding(). |
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changeset
|
418 |
|
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|
419 |
@param "TBitInput& aInput" The input stream with the encoding |
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|
420 |
@param "TUint32 aHuffman[]" The internalized code-length table is placed here |
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|
421 |
@param "TInt aNumCodes" The number of huffman codes in the table |
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|
422 |
|
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|
423 |
@leave "TBitInput::HuffmanL()" |
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|
424 |
|
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|
425 |
@see ExternalizeL() |
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|
426 |
See ExternalizeL for a description of the format |
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|
427 |
*/ |
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|
428 |
void Huffman::InternalizeL(TBitInput& aInput,TUint32 aHuffman[],TInt aNumCodes) |
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|
429 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
430 |
// initialise move-to-front list |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
431 |
TFixedArray<TUint8,Huffman::KMetaCodes> list; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
432 |
for (TInt i=0;i<list.Count();++i) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
433 |
list[i]=TUint8(i); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
434 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
435 |
TInt last=0; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
436 |
// extract codes, reverse rle-0 and mtf encoding in one pass |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
437 |
TUint32* p=aHuffman; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
438 |
const TUint32* end=aHuffman+aNumCodes; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
439 |
TInt rl=0; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
440 |
while (p+rl<end) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
441 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
442 |
TInt c=aInput.HuffmanL(HuffmanDecoding); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
443 |
if (c<2) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
444 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
445 |
// one of the zero codes used by RLE-0 |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
446 |
// update he run-length |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
447 |
rl+=rl+c+1; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
448 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
449 |
else |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
450 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
451 |
while (rl>0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
452 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
453 |
if (p>end) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
454 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
455 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANINVALIDCODINGERROR); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
456 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
457 |
*p++=last; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
458 |
--rl; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
459 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
460 |
--c; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
461 |
list[0]=TUint8(last); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
462 |
last=list[c]; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
463 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
464 |
memmove((void * const)&list[1],(const void * const)&list[0],(size_t)c); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
465 |
if (p>end) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
466 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
467 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANINVALIDCODINGERROR); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
468 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
469 |
*p++=last; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
470 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
471 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
472 |
while (rl>0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
473 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
474 |
if (p>end) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
475 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
476 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANINVALIDCODINGERROR); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
477 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
478 |
*p++=last; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
479 |
--rl; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
480 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
481 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
482 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
483 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
484 |
bit-stream input class |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
485 |
Reverse the byte-order of a 32 bit value |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
486 |
This generates optimal ARM code (4 instructions) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
487 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
488 |
inline TUint reverse(TUint aVal) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
489 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
490 |
TUint v=(aVal<<16)|(aVal>>16); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
491 |
v^=aVal; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
492 |
v&=0xff00ffff; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
493 |
aVal=(aVal>>8)|(aVal<<24); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
494 |
return aVal^(v>>8); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
495 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
496 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
497 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
498 |
Construct a bit stream input object |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
499 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
500 |
Following construction the bit stream is ready for reading bits, but will |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
501 |
immediately call UnderflowL() as the input buffer is empty. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
502 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
503 |
TBitInput::TBitInput():iCount(0),iRemain(0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
504 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
505 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
506 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
507 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
508 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
509 |
Construct a bit stream input object over a buffer |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
510 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
511 |
Following construction the bit stream is ready for reading bits from the specified buffer. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
512 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
513 |
@param "const TUint8* aPtr" The address of the buffer containing the bit stream |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
514 |
@param "TInt aLength" The length of the bitstream in bits |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
515 |
@param "TInt aOffset" The bit offset from the start of the buffer to the bit stream (defaults to zero) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
516 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
517 |
TBitInput::TBitInput(const TUint8* aPtr, TInt aLength, TInt aOffset) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
518 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
519 |
Set(aPtr,aLength,aOffset); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
520 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
521 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
522 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
523 |
Set the memory buffer to use for input. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
524 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
525 |
Bits will be read from this buffer until it is empty, at which point UnderflowL() will be called. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
526 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
527 |
@param "const TUint8* aPtr" The address of the buffer containing the bit stream |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
528 |
@param "TInt aLength" The length of the bitstream in bits |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
529 |
@param "TInt aOffset" The bit offset from the start of the buffer to the bit stream (defaults to zero) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
530 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
531 |
void TBitInput::Set(const TUint8* aPtr, TInt aLength, TInt aOffset) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
532 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
533 |
TUint p=(TUint)aPtr; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
534 |
p+=aOffset>>3; // nearest byte to the specified bit offset |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
535 |
aOffset&=7; // bit offset within the byte |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
536 |
const TUint32* ptr=(const TUint32*)(p&~3); // word containing this byte |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
537 |
aOffset+=(p&3)<<3; // bit offset within the word |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
538 |
if (aLength==0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
539 |
iCount=0; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
540 |
else |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
541 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
542 |
// read the first few bits of the stream |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
543 |
iBits=reverse(*ptr++)<<aOffset; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
544 |
aOffset=32-aOffset; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
545 |
aLength-=aOffset; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
546 |
if (aLength<0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
547 |
aOffset+=aLength; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
548 |
iCount=aOffset; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
549 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
550 |
iRemain=aLength; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
551 |
iPtr=ptr; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
552 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
553 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
554 |
#ifndef __HUFFMAN_MACHINE_CODED__ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
555 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
556 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
557 |
Read a single bit from the input |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
558 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
559 |
Return the next bit in the input stream. This will call UnderflowL() if there are no more |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
560 |
bits available. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
561 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
562 |
@return The next bit in the stream |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
563 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
564 |
@leave "UnderflowL()" It the bit stream is exhausted more UnderflowL is called to get more |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
565 |
data |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
566 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
567 |
TUint TBitInput::ReadL() |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
568 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
569 |
TInt c=iCount; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
570 |
TUint bits=iBits; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
571 |
if (--c<0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
572 |
return ReadL(1); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
573 |
iCount=c; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
574 |
iBits=bits<<1; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
575 |
return bits>>31; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
576 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
577 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
578 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
579 |
Read a multi-bit value from the input |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
580 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
581 |
Return the next few bits as an unsigned integer. The last bit read is the least significant |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
582 |
bit of the returned value, and the value is zero extended to return a 32-bit result. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
583 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
584 |
A read of zero bits will always reaturn zero. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
585 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
586 |
This will call UnderflowL() if there are not enough bits available. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
587 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
588 |
@param "TInt aSize" The number of bits to read |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
589 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
590 |
@return The bits read from the stream |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
591 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
592 |
@leave "UnderflowL()" It the bit stream is exhausted more UnderflowL is called to get more |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
593 |
data |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
594 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
595 |
TUint TBitInput::ReadL(TInt aSize) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
596 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
597 |
if (!aSize) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
598 |
return 0; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
599 |
TUint val=0; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
600 |
TUint bits=iBits; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
601 |
iCount-=aSize; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
602 |
while (iCount<0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
603 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
604 |
// need more bits |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
605 |
#ifdef __CPU_X86 |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
606 |
// X86 does not allow shift-by-32 |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
607 |
if (iCount+aSize!=0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
608 |
val|=bits>>(32-(iCount+aSize))<<(-iCount); // scrub low order bits |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
609 |
#else |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
610 |
val|=bits>>(32-(iCount+aSize))<<(-iCount); // scrub low order bits |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
611 |
#endif |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
612 |
aSize=-iCount; // bits still required |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
613 |
if (iRemain>0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
614 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
615 |
bits=reverse(*iPtr++); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
616 |
iCount+=32; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
617 |
iRemain-=32; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
618 |
if (iRemain<0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
619 |
iCount+=iRemain; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
620 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
621 |
else |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
622 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
623 |
UnderflowL(); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
624 |
bits=iBits; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
625 |
iCount-=aSize; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
626 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
627 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
628 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
629 |
#ifdef __CPU_X86 |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
630 |
// X86 does not allow shift-by-32 |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
631 |
iBits=aSize==32?0:bits<<aSize; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
632 |
#else |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
633 |
iBits=bits<<aSize; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
634 |
#endif |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
635 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
636 |
return val|(bits>>(32-aSize)); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
637 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
638 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
639 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
640 |
Read and decode a Huffman Code |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
641 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
642 |
Interpret the next bits in the input as a Huffman code in the specified decoding. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
643 |
The decoding tree should be the output from Huffman::Decoding(). |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
644 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
645 |
@param "const TUint32* aTree" The huffman decoding tree |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
646 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
647 |
@return The symbol that was decoded |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
648 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
649 |
@leave "UnderflowL()" It the bit stream is exhausted more UnderflowL is called to get more |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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changeset
|
650 |
data |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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changeset
|
651 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
652 |
TUint TBitInput::HuffmanL(const TUint32* aTree) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
653 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
654 |
TUint huff=0; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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changeset
|
655 |
do |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
656 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
657 |
aTree=(const TUint32*)(((TUint8*)aTree)+(huff>>16)); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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changeset
|
658 |
huff=*aTree; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
659 |
if (ReadL()==0) |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
660 |
huff<<=16; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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changeset
|
661 |
} while ((huff&0x10000u)==0); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
662 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
663 |
return huff>>17; |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
664 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
665 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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changeset
|
666 |
#endif |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
667 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
668 |
/** |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
669 |
Handle an empty input buffer |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
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changeset
|
670 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
671 |
This virtual function is called when the input buffer is empty and more bits are required. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
672 |
It should reset the input buffer with more data using Set(). |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
673 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
674 |
A derived class can replace this to read the data from a file (for example) before reseting |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
675 |
the input buffer. |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
676 |
|
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
677 |
@leave "KErrUnderflow" The default implementation leaves |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
678 |
*/ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
679 |
void TBitInput::UnderflowL() |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
680 |
{ |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
681 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANBUFFEROVERFLOWERROR); |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
682 |
} |
818e61de6cd1
Add initial version of Crash Analyser cmdline under EPL
Matti Laitinen <matti.t.laitinen@nokia.com>
parents:
diff
changeset
|
683 |