author | Matti Laitinen <matti.t.laitinen@nokia.com> |
Thu, 11 Feb 2010 15:50:58 +0200 | |
changeset 0 | 818e61de6cd1 |
permissions | -rw-r--r-- |
0
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/* |
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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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* 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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#include "huffman.h" |
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#include "inflate.h" |
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#include "farray.h" |
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|
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/* |
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Inline constructor for CInflater |
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@param aInput |
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@internalComponent |
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@released |
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*/ |
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inline CInflater::CInflater(TBitInput& aInput):iBits(&aInput),iEncoding(0),iOut(0) |
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{ |
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} |
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|
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/* |
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Function for the 2nd phase construction. |
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@param |
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@internalComponent |
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@released |
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*/ |
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void CInflater::ConstructL() |
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{ |
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iEncoding=new TEncoding; |
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InitL(); |
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iLen=0; |
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iOut=new TUint8[KDeflateMaxDistance]; |
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iAvail=iLimit=iOut; |
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} |
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|
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/* |
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Function NewLC |
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@Leave OutOfMemory |
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@param aInput |
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@return pointer to self |
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@internalComponent |
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@released |
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*/ |
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CInflater* CInflater::NewLC(TBitInput& aInput) |
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{ |
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CInflater* self=new CInflater(aInput); |
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self->ConstructL(); |
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|
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return self; |
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} |
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|
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/* |
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Destructor for CInflater |
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@internalComponent |
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@released |
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*/ |
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CInflater::~CInflater() |
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{ |
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delete iEncoding; |
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delete [] iOut; |
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} |
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|
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/* |
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Function ReadL |
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@Leave |
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@param aBuffer |
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@param aLength |
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@internalComponent |
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@released |
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*/ |
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TInt CInflater::ReadL(TUint8* aBuffer,TInt aLength) |
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{ |
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TInt tfr=0; |
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for (;;) |
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{ |
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TInt len; |
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if(aLength > (iLimit-iAvail)) |
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len=iLimit-iAvail; |
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else |
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len=aLength; |
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|
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if (len && aBuffer) |
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{ |
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memcpy((void * const)aBuffer,(const void * const)iAvail,(size_t)len); |
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aBuffer+=len; |
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} |
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aLength-=len; |
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iAvail+=len; |
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tfr+=len; |
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if (aLength==0) |
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return tfr; |
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len=InflateL(); |
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if (len==0) |
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return tfr; |
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iAvail=iOut; |
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iLimit=iAvail+len; |
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108 |
} |
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} |
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110 |
|
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111 |
/* |
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112 |
Function InitL |
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113 |
@Leave |
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114 |
@internalComponent |
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115 |
@released |
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116 |
*/ |
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117 |
void CInflater::InitL() |
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118 |
{ |
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119 |
// read the encoding |
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120 |
Huffman::InternalizeL(*iBits,iEncoding->iLitLen,KDeflationCodes); |
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121 |
// validate the encoding |
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122 |
if (!Huffman::IsValid(iEncoding->iLitLen,TEncoding::ELitLens) || |
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123 |
!Huffman::IsValid(iEncoding->iDistance,TEncoding::EDistances)) |
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124 |
{ |
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125 |
throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANINVALIDCODINGERROR); |
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126 |
} |
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127 |
|
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128 |
// convert the length tables into huffman decoding trees |
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129 |
Huffman::Decoding(iEncoding->iLitLen,TEncoding::ELitLens,iEncoding->iLitLen); |
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130 |
Huffman::Decoding(iEncoding->iDistance,TEncoding::EDistances,iEncoding->iDistance,KDeflateDistCodeBase); |
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131 |
} |
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132 |
|
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133 |
/* |
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134 |
Consume all data lag in the history buffer, then decode to fill up the output buffer |
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135 |
Return the number of available bytes in the output buffer. This is only ever less than the |
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136 |
buffer size if the end of stream marker has been read. |
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137 |
@internalComponent |
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138 |
@released |
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139 |
*/ |
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140 |
TInt CInflater::InflateL() |
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141 |
{ |
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142 |
// empty the history buffer into the output |
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143 |
TUint8* out=iOut; |
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144 |
TUint8* const end=out+KDeflateMaxDistance; |
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145 |
const TUint32* tree=iEncoding->iLitLen; |
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146 |
if (iLen<0) // EOF |
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147 |
return 0; |
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148 |
if (iLen>0) |
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149 |
goto useHistory; |
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150 |
|
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151 |
while (out<end) |
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152 |
{ |
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153 |
// get a huffman code |
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154 |
{ |
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155 |
TInt val=iBits->HuffmanL(tree)-TEncoding::ELiterals; |
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156 |
if (val<0) |
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157 |
{ |
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158 |
*out++=TUint8(val); |
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159 |
continue; // another literal/length combo |
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160 |
} |
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|
161 |
if (val==TEncoding::EEos-TEncoding::ELiterals) |
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|
162 |
{ // eos marker. we're done |
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|
163 |
iLen=-1; |
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164 |
break; |
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165 |
} |
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|
166 |
|
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|
167 |
// get the extra bits for the code |
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|
168 |
TInt code=val&0xff; |
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169 |
if (code>=8) |
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170 |
{ // xtra bits |
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171 |
TInt xtra=(code>>2)-1; |
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|
172 |
code-=xtra<<2; |
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|
173 |
code<<=xtra; |
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|
174 |
code|=iBits->ReadL(xtra); |
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175 |
} |
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|
176 |
if (val<KDeflateDistCodeBase-TEncoding::ELiterals) |
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|
177 |
{ // length code... get the code |
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|
178 |
iLen=code+KDeflateMinLength; |
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|
179 |
tree=iEncoding->iDistance; |
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180 |
continue; // read the huffman code |
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|
181 |
} |
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|
182 |
// distance code |
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|
183 |
iRptr=out-(code+1); |
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|
184 |
if (iRptr+KDeflateMaxDistance<end) |
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|
185 |
iRptr+=KDeflateMaxDistance; |
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|
186 |
} |
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|
187 |
useHistory: |
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|
188 |
TInt tfr; |
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|
189 |
if(iLen > (end-out)) |
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|
190 |
tfr=end-out; |
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|
191 |
else |
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|
192 |
tfr=iLen; |
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|
193 |
|
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|
194 |
iLen-=tfr; |
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|
195 |
const TUint8* from=iRptr; |
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|
196 |
do |
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|
197 |
{ |
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|
198 |
*out++=*from++; |
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|
199 |
if (from==end) |
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|
200 |
from-=KDeflateMaxDistance; |
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|
201 |
}while (--tfr!=0); |
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|
202 |
iRptr=from; |
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|
203 |
tree=iEncoding->iLitLen; |
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|
204 |
}; |
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|
205 |
|
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|
206 |
return out-iOut; |
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|
207 |
} |
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|
208 |
|
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|
209 |
/* |
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|
210 |
TFileInput Constructor |
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|
211 |
@param source |
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|
212 |
@param size |
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|
213 |
@internalComponent |
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214 |
@released |
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|
215 |
*/ |
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|
216 |
TFileInput::TFileInput(unsigned char* source,int size):iReadBuf(source),iSize(size) |
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|
217 |
{ |
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|
218 |
Set(source,iSize*8); |
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219 |
} |
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|
220 |
|
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/* |
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TFileInput Destructor |
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@internalComponent |
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@released |
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*/ |
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TFileInput::~TFileInput() |
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{ |
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} |
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/* |
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Function UnderFlowL |
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@Leave E32ImageCompressionError |
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@internalComponent |
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@released |
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*/ |
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void TFileInput::UnderflowL() |
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{ |
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throw E32ImageCompressionError(E32ImageCompressionError::HUFFMANBUFFERUNDERFLOWERROR); |
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} |
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/* |
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Function InflateUncompress |
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@param source |
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@param sourcesize |
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@param dest |
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@param destsize |
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@internalComponent |
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@released |
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*/ |
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TInt InflateUnCompress(unsigned char* source, int sourcesize,unsigned char* dest, int destsize) |
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{ |
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TFileInput* input = new TFileInput(source, sourcesize); |
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CInflater* inflater=CInflater::NewLC(*input); |
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const TInt ret = inflater->ReadL(dest,destsize); |
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delete input; |
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delete inflater; |
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return ret; |
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} |
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