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1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // GZIP output stream functions |
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15 // |
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16 |
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17 #include "xmlenggzipfileoutputstream.h" |
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18 #include <ezstream.h> |
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19 #include <ezcompressor.h> |
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20 |
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21 /** |
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22 * Default input buffers size. |
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23 */ |
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24 const TInt CXmlEngGZIPFileOutputStream::KDefaultInputBufferSize = 4096; |
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25 |
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26 /** |
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27 * Output buffer size. It determines, how often output data will be written |
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28 * to disk. (it's written to disk, when buffer is full. |
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29 * |
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30 */ |
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31 const TInt CXmlEngGZIPFileOutputStream::KOutputBufferSize = 0x8000; |
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32 |
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33 CXmlEngGZIPFileOutputStream* CXmlEngGZIPFileOutputStream::NewLC( RFile& aOutputFile, |
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34 RFs& aRFs ) |
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35 { |
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36 CXmlEngGZIPFileOutputStream* gzfos = new (ELeave) CXmlEngGZIPFileOutputStream( aOutputFile, |
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37 aRFs ); |
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38 CleanupStack::PushL( gzfos ); |
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39 gzfos->ConstructL(); |
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40 return gzfos; |
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41 } |
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42 |
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43 CXmlEngGZIPFileOutputStream* CXmlEngGZIPFileOutputStream::NewL( RFile& aOutputFile, |
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44 RFs& aRFs ) |
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45 { |
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46 CXmlEngGZIPFileOutputStream* gzfos = CXmlEngGZIPFileOutputStream::NewLC( aOutputFile, |
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47 aRFs ); |
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48 CleanupStack::Pop( gzfos ); |
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49 return gzfos; |
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50 } |
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51 |
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52 CXmlEngGZIPFileOutputStream::CXmlEngGZIPFileOutputStream( RFile& aOutputFile, RFs& aRFs ) |
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53 { |
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54 iKeepGoing = ETrue; |
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55 iOutputFile = aOutputFile; |
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56 iRFs = aRFs; |
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57 iCrc = crc32( iCrc, NULL, 0 ); |
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58 } |
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59 |
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60 void CXmlEngGZIPFileOutputStream::ConstructL() |
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61 { |
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62 EZGZipFile::WriteHeaderL( iOutputFile, iHeader ); |
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63 //we can't create compressor here, because we heve no input at this moment |
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64 iOutputDescriptor.CreateL( KOutputBufferSize ); |
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65 iInputDescriptor.CreateL( KDefaultInputBufferSize ); |
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66 iOldInputDescriptor.CreateL( KDefaultInputBufferSize ); |
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67 } |
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68 |
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69 CXmlEngGZIPFileOutputStream::~CXmlEngGZIPFileOutputStream() |
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70 { |
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71 delete iCompressor; |
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72 iOutputDescriptor.Close(); |
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73 iInputDescriptor.Close(); |
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74 iOldInputDescriptor.Close(); |
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75 } |
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76 |
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77 TInt CXmlEngGZIPFileOutputStream::Write( const TDesC8& aBuffer ) |
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78 { |
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79 TRAP ( iError, WriteL( aBuffer ) ); |
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80 if ( iError ) |
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81 { |
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82 return KErrNotFound; |
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83 } |
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84 |
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85 TInt bufferSize = aBuffer.Size(); |
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86 iUncompressedDataSize += bufferSize; |
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87 |
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88 return bufferSize; |
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89 } |
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90 |
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91 void CXmlEngGZIPFileOutputStream::WriteL( const TDesC8& aBuffer ) |
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92 { |
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93 iNoInputNeeded = ETrue; |
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94 if ( !iCompressor ) |
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95 { |
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96 const TInt newLength = aBuffer.Length(); |
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97 if ( newLength > iInputDescriptor.MaxLength() ) |
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98 { |
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99 iInputDescriptor.ReAllocL( newLength ); |
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100 } |
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101 iInputDescriptor.Copy( aBuffer ); |
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102 iCompressor = CEZCompressor::NewL( *this, CEZCompressor::EDefaultCompression, |
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103 -CEZCompressor::EMaxWBits ); |
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104 } |
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105 else |
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106 { |
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107 iInputDescriptor.Swap( iOldInputDescriptor ); |
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108 const TInt newLength = aBuffer.Length(); |
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109 if ( newLength > iInputDescriptor.MaxLength() ) |
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110 { |
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111 iInputDescriptor.ReAllocL( newLength ); |
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112 } |
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113 iInputDescriptor.Copy( aBuffer ); |
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114 |
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115 while ( iNoInputNeeded ) |
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116 { |
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117 iCompressor->DeflateL(); |
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118 } |
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119 } |
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120 } |
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121 |
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122 TInt CXmlEngGZIPFileOutputStream::Close() |
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123 { |
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124 iCloseInvoked = ETrue; |
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125 if ( iError ) |
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126 { |
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127 return -1; |
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128 } |
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129 TRAP ( iError, CloseL() ); |
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130 if ( iError ) |
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131 { |
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132 return KErrNotFound; |
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133 } |
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134 return KErrNone; |
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135 } |
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136 |
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137 void CXmlEngGZIPFileOutputStream::CloseL() |
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138 { |
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139 while ( iKeepGoing ) |
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140 { |
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141 iKeepGoing = iCompressor->DeflateL(); |
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142 } |
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143 TEZGZipTrailer trailer( iCrc, iUncompressedDataSize ); |
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144 EZGZipFile::WriteTrailerL( iOutputFile, trailer ); |
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145 } |
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146 |
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147 TInt CXmlEngGZIPFileOutputStream::CheckError() |
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148 { |
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149 return iError; |
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150 } |
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151 |
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152 void CXmlEngGZIPFileOutputStream::InitializeL( CEZZStream& aZStream ) |
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153 { |
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154 aZStream.SetInput(iInputDescriptor); |
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155 aZStream.SetOutput(iOutputDescriptor); |
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156 iCrc = crc32(iCrc,iInputDescriptor.Ptr(),iInputDescriptor.Size()); |
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157 iNoInputNeeded = EFalse; |
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158 } |
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159 |
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160 void CXmlEngGZIPFileOutputStream::NeedInputL( CEZZStream& aZStream ) |
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161 { |
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162 if ( iCloseInvoked ) |
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163 { |
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164 aZStream.SetInput( KNullDesC8 ); |
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165 iCrc = crc32( iCrc, (unsigned char*)18, 0 ); |
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166 //second argument can't be null, and third should be 0 !!! |
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167 } |
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168 else |
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169 { |
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170 aZStream.SetInput( iInputDescriptor ); |
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171 iCrc = crc32( iCrc, iInputDescriptor.Ptr(), iInputDescriptor.Size() ); |
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172 iNoInputNeeded = EFalse; |
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173 } |
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174 } |
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175 |
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176 void CXmlEngGZIPFileOutputStream::NeedOutputL( CEZZStream& aZStream ) |
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177 { |
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178 TPtrC8 od = aZStream.OutputDescriptor(); |
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179 User::LeaveIfError( iOutputFile.Write(od) ); |
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180 aZStream.SetOutput( iOutputDescriptor ); |
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181 } |
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182 |
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183 void CXmlEngGZIPFileOutputStream::FinalizeL( CEZZStream& aZStream ) |
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184 { |
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185 TPtrC8 od = aZStream.OutputDescriptor(); |
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186 User::LeaveIfError( iOutputFile.Write(od) ); |
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187 } |
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188 |