author | yiluzhu |
Fri, 11 Dec 2009 15:23:56 +0000 | |
branch | fix |
changeset 46 | 14d284e75719 |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
0
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// Copyright (c) 2005-2009 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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// Implementation of the Inflater for e32 image dump for the elf2e32 tool |
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// @internalComponent |
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// @released |
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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 <cpudefs.h> |
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#include "farray.h" |
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#include "errorhandler.h" |
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#include<iostream> |
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using std::cout; |
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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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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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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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return self; |
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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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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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} |
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} |
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|
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/* |
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Function InitL |
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@Leave |
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@internalComponent |
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@released |
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*/ |
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void CInflater::InitL() |
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{ |
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// read the encoding |
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Huffman::InternalizeL(*iBits,iEncoding->iLitLen,KDeflationCodes); |
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// validate the encoding |
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if (!Huffman::IsValid(iEncoding->iLitLen,TEncoding::ELitLens) || |
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!Huffman::IsValid(iEncoding->iDistance,TEncoding::EDistances)) |
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{ |
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throw E32ImageCompressionError(HUFFMANINVALIDCODINGERROR); |
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} |
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|
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// convert the length tables into huffman decoding trees |
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135 |
Huffman::Decoding(iEncoding->iLitLen,TEncoding::ELitLens,iEncoding->iLitLen); |
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136 |
Huffman::Decoding(iEncoding->iDistance,TEncoding::EDistances,iEncoding->iDistance,KDeflateDistCodeBase); |
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137 |
} |
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|
138 |
|
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|
139 |
/* |
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140 |
Consume all data lag in the history buffer, then decode to fill up the output buffer |
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|
141 |
Return the number of available bytes in the output buffer. This is only ever less than the |
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142 |
buffer size if the end of stream marker has been read. |
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143 |
@internalComponent |
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144 |
@released |
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145 |
*/ |
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146 |
TInt CInflater::InflateL() |
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147 |
{ |
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148 |
// empty the history buffer into the output |
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|
149 |
TUint8* out=iOut; |
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150 |
TUint8* const end=out+KDeflateMaxDistance; |
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151 |
const TUint32* tree=iEncoding->iLitLen; |
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152 |
if (iLen<0) // EOF |
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153 |
return 0; |
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154 |
if (iLen>0) |
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|
155 |
goto useHistory; |
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|
156 |
|
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157 |
while (out<end) |
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158 |
{ |
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|
159 |
// get a huffman code |
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160 |
{ |
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161 |
TInt val=iBits->HuffmanL(tree)-TEncoding::ELiterals; |
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|
162 |
if (val<0) |
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|
163 |
{ |
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164 |
*out++=TUint8(val); |
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165 |
continue; // another literal/length combo |
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|
166 |
} |
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|
167 |
if (val==TEncoding::EEos-TEncoding::ELiterals) |
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|
168 |
{ // eos marker. we're done |
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|
169 |
iLen=-1; |
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170 |
break; |
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|
171 |
} |
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|
172 |
|
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|
173 |
// get the extra bits for the code |
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|
174 |
TInt code=val&0xff; |
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|
175 |
if (code>=8) |
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|
176 |
{ // xtra bits |
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177 |
TInt xtra=(code>>2)-1; |
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178 |
code-=xtra<<2; |
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179 |
code<<=xtra; |
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180 |
code|=iBits->ReadL(xtra); |
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181 |
} |
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182 |
if (val<KDeflateDistCodeBase-TEncoding::ELiterals) |
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|
183 |
{ // length code... get the code |
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|
184 |
iLen=code+KDeflateMinLength; |
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|
185 |
tree=iEncoding->iDistance; |
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|
186 |
continue; // read the huffman code |
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|
187 |
} |
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|
188 |
// distance code |
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|
189 |
iRptr=out-(code+1); |
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|
190 |
if (iRptr+KDeflateMaxDistance<end) |
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|
191 |
iRptr+=KDeflateMaxDistance; |
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|
192 |
} |
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|
193 |
useHistory: |
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|
194 |
TInt tfr; |
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|
195 |
if(iLen > (end-out)) |
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|
196 |
tfr=end-out; |
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|
197 |
else |
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|
198 |
tfr=iLen; |
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|
199 |
|
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|
200 |
iLen-=tfr; |
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|
201 |
const TUint8* from=iRptr; |
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|
202 |
do |
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|
203 |
{ |
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|
204 |
*out++=*from++; |
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|
205 |
if (from==end) |
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|
206 |
from-=KDeflateMaxDistance; |
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|
207 |
}while (--tfr!=0); |
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|
208 |
iRptr=from; |
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|
209 |
tree=iEncoding->iLitLen; |
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|
210 |
}; |
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|
211 |
|
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|
212 |
return out-iOut; |
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|
213 |
} |
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|
214 |
|
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|
215 |
/* |
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|
216 |
TFileInput Constructor |
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|
217 |
@param source |
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|
218 |
@param size |
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219 |
@internalComponent |
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220 |
@released |
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|
221 |
*/ |
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|
222 |
TFileInput::TFileInput(unsigned char* source,int size):iReadBuf(source),iSize(size) |
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|
223 |
{ |
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|
224 |
Set(source,iSize*8); |
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|
225 |
} |
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|
226 |
|
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|
227 |
/* |
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|
228 |
TFileInput Destructor |
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|
229 |
@internalComponent |
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|
230 |
@released |
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|
231 |
*/ |
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|
232 |
TFileInput::~TFileInput() |
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|
233 |
{ |
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|
234 |
|
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|
235 |
} |
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|
236 |
|
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|
237 |
/* |
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|
238 |
Function UnderFlowL |
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|
239 |
@Leave E32ImageCompressionError |
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|
240 |
@internalComponent |
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|
241 |
@released |
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|
242 |
*/ |
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|
243 |
void TFileInput::UnderflowL() |
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|
244 |
{ |
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|
245 |
throw E32ImageCompressionError(HUFFMANBUFFERUNDERFLOWERROR); |
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|
246 |
} |
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changeset
|
247 |
|
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|
248 |
/* |
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|
249 |
Function InflateUncompress |
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|
250 |
@param source |
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|
251 |
@param sourcesize |
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|
252 |
@param dest |
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|
253 |
@param destsize |
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|
254 |
@internalComponent |
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|
255 |
@released |
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|
256 |
*/ |
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|
257 |
void InflateUnCompress(unsigned char* source, int sourcesize,unsigned char* dest, int destsize) |
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|
258 |
{ |
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|
259 |
TFileInput* input = new TFileInput(source, sourcesize); |
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|
260 |
CInflater* inflater=CInflater::NewLC(*input); |
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|
261 |
inflater->ReadL(dest,destsize); |
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|
262 |
delete input; |
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|
263 |
delete inflater; |
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|
264 |
} |
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changeset
|
265 |