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1 // Copyright (c) 2003-2009 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 // |
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15 |
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16 #include <ezgzip.h> |
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17 #include "libzcore.h" |
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18 |
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19 const TUint8 EZGZipFile::ID1 = 31; |
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20 const TUint8 EZGZipFile::ID2 = 139; |
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21 |
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22 /** |
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23 Constructor |
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24 */ |
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25 EXPORT_C TEZGZipHeader::TEZGZipHeader() : iId1(EZGZipFile::ID1), iId2(EZGZipFile::ID2), iCompressionMethod(8), iFlags(0), iTime(0), |
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26 iExtraFlags(0), iOs(255), iXlen(0), iExtra(NULL), iFname(NULL), iComment(NULL), iCrc(0) |
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27 { |
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28 |
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29 } |
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30 |
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31 /** |
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32 Destructor |
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33 */ |
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34 EXPORT_C TEZGZipHeader::~TEZGZipHeader() |
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35 { |
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36 delete iExtra; |
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37 delete iFname; |
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38 delete iComment; |
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39 } |
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40 |
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41 /** |
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42 Constructor |
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43 */ |
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44 EXPORT_C TEZGZipTrailer::TEZGZipTrailer() : iCrc32(0), iSize(0) |
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45 { |
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46 |
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47 } |
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48 |
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49 /** |
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50 Constructor |
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51 |
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52 @param aCrc the CRC to use for archive checking |
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53 @param aSize the size of the trailer |
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54 */ |
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55 EXPORT_C TEZGZipTrailer::TEZGZipTrailer(TInt32 aCrc, TInt32 aSize) : iCrc32(aCrc), iSize(aSize) |
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56 { |
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57 |
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58 } |
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59 |
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60 //-------------------------------------------------------------------------------------------------------- |
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61 |
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62 /** |
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63 Read the zip header from the specified zip file into the TEZGZipHeader object |
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64 |
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65 @param aFile the zip file to read from |
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66 @param aHeader the target header object |
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67 @leave KEZlibErrBadGZipHeader invalid zip header |
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68 @leave ... Any of the system wide error codes |
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69 */ |
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70 EXPORT_C void EZGZipFile::ReadHeaderL(RFile &aFile, TEZGZipHeader &aHeader) |
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71 { |
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72 TInt obligatoryData = sizeof(aHeader.iId1) + sizeof(aHeader.iId2) + sizeof(aHeader.iCompressionMethod) + |
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73 sizeof(aHeader.iFlags) + sizeof(aHeader.iTime) + sizeof(aHeader.iExtraFlags) + sizeof(aHeader.iOs); |
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74 |
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75 TPtr8 des(&aHeader.iId1,0,obligatoryData); |
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76 TInt err = aFile.Read(des); |
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77 if (err != KErrNone || (des.Size() != obligatoryData)) |
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78 User::Leave(KEZlibErrBadGZipHeader); |
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79 |
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80 if (aHeader.iId1 != ID1 || aHeader.iId2 != ID2) |
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81 User::Leave(KEZlibErrBadGZipHeader); |
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82 |
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83 if (aHeader.iFlags & (1 << EFExtra)) // then the extra bit is set |
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84 { |
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85 des.Set(REINTERPRET_CAST(TUint8 *,&aHeader.iXlen),0,sizeof(aHeader.iXlen)); |
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86 err = aFile.Read(des); |
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87 if (err != KErrNone || des.Size() != sizeof(aHeader.iXlen) || aHeader.iXlen < 0) |
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88 User::Leave(KEZlibErrBadGZipHeader); |
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89 |
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90 aHeader.iExtra = HBufC8::NewMaxL(aHeader.iXlen); |
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91 TPtr8 des = aHeader.iExtra->Des(); |
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92 err = aFile.Read(des); |
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93 if (err != KErrNone || des.Size() != aHeader.iXlen) |
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94 User::Leave(KEZlibErrBadGZipHeader); |
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95 } |
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96 |
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97 if (aHeader.iFlags & (1 << EFName)) // then read in filename |
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98 ReadStringIntoDescriptorL(aFile,&aHeader.iFname); |
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99 |
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100 if (aHeader.iFlags & (1 << EFComment)) // then read in comment |
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101 ReadStringIntoDescriptorL(aFile,&aHeader.iComment); |
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102 |
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103 if (aHeader.iFlags & (1 << EFHcrc)) |
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104 { |
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105 des.Set(REINTERPRET_CAST(TUint8*,&aHeader.iCrc),0,sizeof(aHeader.iCrc)); |
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106 err = aFile.Read(des); |
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107 if (err != KErrNone || des.Size() != sizeof(aHeader.iCrc)) |
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108 User::Leave(KEZlibErrBadGZipHeader); |
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109 } |
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110 } |
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111 |
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112 /** |
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113 Write the zip header to the specified file |
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114 |
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115 @param aFile the file to write to |
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116 @param aHeader the header object to write to the file |
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117 @leave ... Any of the system wide error codes |
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118 */ |
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119 EXPORT_C void EZGZipFile::WriteHeaderL(RFile &aFile, TEZGZipHeader &aHeader) |
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120 { |
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121 TInt obligatoryData = sizeof(aHeader.iId1) + sizeof(aHeader.iId2) + sizeof(aHeader.iCompressionMethod) + |
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122 sizeof(aHeader.iFlags) + sizeof(aHeader.iTime) + sizeof(aHeader.iExtraFlags) + sizeof(aHeader.iOs); |
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123 |
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124 TPtrC8 des(&aHeader.iId1,obligatoryData); |
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125 User::LeaveIfError(aFile.Write(des)); |
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126 TBuf8<1> null(1); |
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127 null[0] = '\0'; |
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128 |
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129 if (aHeader.iFlags & (1 << EFExtra)) // then the extra bit is set |
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130 { |
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131 des.Set(REINTERPRET_CAST(TUint8 *,&aHeader.iXlen),sizeof(aHeader.iXlen)); |
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132 User::LeaveIfError(aFile.Write(des)); |
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133 |
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134 User::LeaveIfError(aFile.Write(*aHeader.iExtra)); |
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135 } |
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136 |
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137 if (aHeader.iFlags & (1 << EFName)) // then read in filename |
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138 { |
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139 User::LeaveIfError(aFile.Write(*aHeader.iFname)); |
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140 User::LeaveIfError(aFile.Write(null)); |
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141 } |
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142 |
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143 if (aHeader.iFlags & (1 << EFComment)) // then read in comment |
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144 { |
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145 User::LeaveIfError(aFile.Write(*aHeader.iComment)); |
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146 User::LeaveIfError(aFile.Write(null)); |
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147 } |
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148 |
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149 if (aHeader.iFlags & (1 << EFHcrc)) |
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150 { |
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151 des.Set(REINTERPRET_CAST(TUint8*,&aHeader.iCrc),sizeof(aHeader.iCrc)); |
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152 User::LeaveIfError(aFile.Write(des)); |
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153 } |
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154 } |
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155 |
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156 void EZGZipFile::ReadStringIntoDescriptorL(RFile &aFile, HBufC8 **aDes) |
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157 { |
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158 TInt i, err; |
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159 CArrayFixFlat<TUint8> *bytes = new (ELeave) CArrayFixFlat<TUint8>(16); |
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160 CleanupStack::PushL(bytes); |
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161 TBuf8<1> ch; |
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162 while ((err = aFile.Read(ch)) == KErrNone) |
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163 { |
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164 if (ch.Length() != 1) |
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165 User::Leave(KEZlibErrBadGZipHeader); |
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166 else if (ch[0] != '\0') |
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167 bytes->AppendL(*ch.Ptr()); |
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168 else |
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169 break; |
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170 } |
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171 |
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172 if (err != KErrNone) |
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173 User::Leave(KEZlibErrBadGZipHeader); |
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174 |
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175 *aDes = HBufC8::NewMaxL(bytes->Count()); |
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176 |
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177 for (i = 0; i < bytes->Count(); i++) |
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178 (*aDes)->Des()[i] = (*bytes)[i]; |
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179 |
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180 CleanupStack::PopAndDestroy(); // delete bytes |
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181 } |
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182 |
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183 /** |
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184 Read the zip trailer from the specified zip file into the TEZGZipTrailer object |
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185 |
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186 @param aFile the zip file to read from |
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187 @param aTrailer the target trailer object |
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188 @leave KEZlibErrBadGZipTrailer invalid zip trailer |
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189 @leave ... Any of the system wide error codes |
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190 */ |
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191 EXPORT_C void EZGZipFile::ReadTrailerL(RFile &aFile, TEZGZipTrailer &aTrailer) |
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192 { |
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193 TPtr8 des(REINTERPRET_CAST(TUint8*,&aTrailer.iCrc32),0,sizeof(TEZGZipTrailer)); |
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194 |
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195 TInt err = aFile.Read(des); |
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196 if (err != KErrNone || des.Size() != sizeof(TEZGZipTrailer)) |
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197 User::Leave(KEZlibErrBadGZipTrailer); |
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198 } |
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199 |
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200 /** |
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201 Write the zip trailer to the specified file |
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202 |
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203 @param aFile the file to write to |
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204 @param aTrailer the trailer object to write to the file |
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205 @leave ... Any of the system wide error codes |
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206 */ |
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207 EXPORT_C void EZGZipFile::WriteTrailerL(RFile &aFile, TEZGZipTrailer &aTrailer) |
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208 { |
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209 TPtrC8 des(REINTERPRET_CAST(TUint8*,&aTrailer.iCrc32),sizeof(TEZGZipTrailer)); |
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210 User::LeaveIfError(aFile.Write(des)); |
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211 } |
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212 |
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213 /** |
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214 Find the zip trailer within the specified file, and read it into the TEZGZipTrailer object |
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215 |
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216 @param aRfs file server session |
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217 @param aFname the file to read from |
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218 @param aTrailer the target trailer object |
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219 @leave KEZlibErrBadGZipHeader Invalid zip header |
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220 @leave ... Any of the system wide error codes |
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221 */ |
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222 EXPORT_C void EZGZipFile::LocateAndReadTrailerL(RFs &aRfs, const TDesC &aFname, TEZGZipTrailer &aTrailer) |
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223 { |
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224 TInt fileSize; |
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225 |
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226 RFile file; |
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227 |
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228 User::LeaveIfError(file.Open(aRfs,aFname,EFileStream | EFileRead | EFileShareAny)); |
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229 CleanupClosePushL(file); |
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230 |
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231 TUint8 magic[2]; |
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232 TPtr8 des(magic,0,sizeof(TUint8) * 2); |
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233 User::LeaveIfError(file.Read(des)); |
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234 if (magic[0] != ID1 || magic[1] != ID2) |
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235 User::Leave(KEZlibErrBadGZipHeader); |
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236 |
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237 User::LeaveIfError(file.Size(fileSize)); |
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238 TInt sizePos = fileSize - (sizeof (TInt32) * 2); |
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239 User::LeaveIfError(file.Seek(ESeekStart,sizePos)); |
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240 |
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241 des.Set(REINTERPRET_CAST(TUint8 *,&aTrailer),0,sizeof(TInt32)*2); |
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242 |
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243 User::LeaveIfError(file.Read(des)); |
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244 |
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245 CleanupStack::PopAndDestroy(); |
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246 } |
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247 |
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248 /** |
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249 @deprecated Interface is deprecated because it is unsafe as it may leave. It is available for backward compatibility reasons only. |
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250 @see EZGZipFile::IsGzipFileL |
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251 */ |
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252 EXPORT_C TBool EZGZipFile::IsGzipFile(RFs &aRfs, const TDesC &aFname) |
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253 { |
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254 TBool retBool = true; |
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255 TRAPD(errCode, retBool = IsGzipFileL(aRfs, aFname)); |
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256 if(errCode != KErrNone) |
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257 { |
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258 retBool = false; |
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259 } |
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260 return retBool; |
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261 } |
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262 |
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263 /** |
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264 Determine if the given file is a valid zip file |
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265 |
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266 @param aRfs file server session |
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267 @param aFname name of the file to check |
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268 @leave ... Any of the system wide error codes |
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269 @return ETrue if the file is valid zip file, EFalse otherwise |
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270 */ |
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271 EXPORT_C TBool EZGZipFile::IsGzipFileL(RFs &aRfs, const TDesC &aFname) |
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272 { |
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273 TUint8 ids[2]; |
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274 RFile file; |
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275 |
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276 User::LeaveIfError(file.Open(aRfs,aFname,EFileStream | EFileRead | EFileShareAny)); |
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277 CleanupClosePushL(file); |
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278 |
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279 TPtr8 des(ids,0,sizeof(TUint8) * 2); |
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280 |
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281 User::LeaveIfError(file.Read(des)); |
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282 CleanupStack::PopAndDestroy(); |
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283 return (ids[0] == ID1 && ids[1] == ID2); |
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284 } |
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285 |
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286 //-------------------------------------------------------------------------------------------------------- |
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287 |
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288 |
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289 CEZFileToGzipBM::CEZFileToGzipBM(RFile &aInput, RFile &aOutput) : CEZFileBufferManager(aInput,aOutput) |
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290 { |
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291 iCrc = crc32_r(iCrc,NULL,0); |
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292 } |
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293 |
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294 |
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295 CEZFileToGzipBM* CEZFileToGzipBM::NewLC(RFile &aInput, RFile &aOutput, TInt aBufferSize) |
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296 { |
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297 CEZFileToGzipBM *bm = new (ELeave) CEZFileToGzipBM(aInput,aOutput); |
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298 CleanupStack::PushL(bm); |
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299 bm->ConstructL(aBufferSize); |
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300 return bm; |
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301 } |
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302 |
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303 CEZFileToGzipBM* CEZFileToGzipBM::NewL(RFile &aInput, RFile &aOutput, TInt aBufferSize) |
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304 { |
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305 CEZFileToGzipBM *bm = new (ELeave) CEZFileToGzipBM(aInput,aOutput); |
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306 CleanupStack::PushL(bm); |
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307 bm->ConstructL(aBufferSize); |
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308 CleanupStack::Pop(); |
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309 return bm; |
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310 } |
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311 |
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312 void CEZFileToGzipBM::NeedInputL(CEZZStream &aZStream) |
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313 { |
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314 CEZFileBufferManager::NeedInputL(aZStream); |
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315 iCrc = crc32_r(iCrc,iInputDescriptor.Ptr(),iInputDescriptor.Size()); |
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316 } |
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317 |
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318 void CEZFileToGzipBM::InitializeL(CEZZStream &aZStream) |
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319 { |
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320 CEZFileBufferManager::InitializeL(aZStream); |
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321 iCrc = crc32_r(iCrc,iInputDescriptor.Ptr(),iInputDescriptor.Size()); |
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322 } |
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323 |
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324 //-------------------------------------------------------------------------------------------------------- |
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325 |
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326 |
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327 CEZGzipToFileBM::CEZGzipToFileBM(RFile &aInput, RFile &aOutput) : CEZFileBufferManager(aInput,aOutput) |
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328 { |
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329 iCrc = crc32_r(iCrc,NULL,0); |
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330 } |
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331 |
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332 CEZGzipToFileBM* CEZGzipToFileBM::NewLC(RFile &aInput, RFile &aOutput, TInt aBufferSize) |
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333 { |
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334 CEZGzipToFileBM *bm = new (ELeave) CEZGzipToFileBM(aInput,aOutput); |
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335 CleanupStack::PushL(bm); |
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336 bm->ConstructL(aBufferSize); |
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337 return bm; |
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338 } |
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339 |
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340 CEZGzipToFileBM* CEZGzipToFileBM::NewL(RFile &aInput, RFile &aOutput, TInt aBufferSize) |
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341 { |
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342 CEZGzipToFileBM *bm = new (ELeave) CEZGzipToFileBM(aInput,aOutput); |
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343 CleanupStack::PushL(bm); |
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344 bm->ConstructL(aBufferSize); |
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345 CleanupStack::Pop(); |
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346 return bm; |
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347 } |
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348 |
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349 void CEZGzipToFileBM::NeedOutputL(CEZZStream &aZStream) |
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350 { |
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351 TPtrC8 od = aZStream.OutputDescriptor(); |
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352 iCrc = crc32_r(iCrc,od.Ptr(),od.Size()); |
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353 CEZFileBufferManager::NeedOutputL(aZStream); |
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354 } |
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355 |
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356 void CEZGzipToFileBM::FinalizeL(CEZZStream &aZStream) |
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357 { |
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358 TPtrC8 od = aZStream.OutputDescriptor(); |
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359 iCrc = crc32_r(iCrc,od.Ptr(),od.Size()); |
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360 CEZFileBufferManager::FinalizeL(aZStream); |
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361 } |
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362 |
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363 |
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364 //-------------------------------------------------------------------------------------------------------- |
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365 CEZGZipToFile::CEZGZipToFile() : iDecompressor(NULL), iBufferManager(NULL) |
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366 { |
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367 |
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368 } |
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369 |
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370 CEZGZipToFile::~CEZGZipToFile() |
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371 { |
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372 delete iDecompressor; |
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373 delete iBufferManager; |
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374 iGZipFile.Close(); |
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375 } |
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376 |
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377 /** |
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378 Creates a new CEZGZipToFile object and leaves it on the CleanupStack |
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379 |
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380 @param aRfs open file server session |
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381 @param aGzFileName name of the file to be de-compressed |
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382 @param aOutput the target file to hold the un-compressed data |
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383 @param aBufferSize required size of buffers |
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384 @return a pointer to the new CEZGZipToFile object, left on the CleanupStack |
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385 */ |
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386 EXPORT_C CEZGZipToFile* CEZGZipToFile::NewLC(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize) |
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387 { |
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388 CEZGZipToFile* dec = new (ELeave) CEZGZipToFile; |
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389 CleanupStack::PushL(dec); |
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390 dec->ConstructL(aRfs,aGzFileName,aOutput,aBufferSize); |
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391 return dec; |
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392 } |
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393 |
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394 /** |
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395 Creates a new CEZGZipToFile object |
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396 |
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397 @param aRfs open file server session |
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398 @param aGzFileName name of the file to be de-compressed |
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399 @param aOutput the target file to hold the un-compressed data |
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400 @param aBufferSize required size of buffers |
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401 @return a pointer to the new CEZGZipToFile object |
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402 */ |
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403 EXPORT_C CEZGZipToFile* CEZGZipToFile::NewL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize) |
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404 { |
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405 CEZGZipToFile* dec = new (ELeave) CEZGZipToFile; |
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406 CleanupStack::PushL(dec); |
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407 dec->ConstructL(aRfs,aGzFileName,aOutput,aBufferSize); |
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408 CleanupStack::Pop(); |
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409 return dec; |
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410 } |
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411 |
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412 /** |
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413 Quits the current de-compression operation and restarts with the specified arguments |
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414 |
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415 @param aRfs open file server session |
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416 @param aGzFileName name of the file to be de-compressed |
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417 @param aOutput the target file to hold the un-compressed data |
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418 @param aBufferSize required size of buffers |
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419 @leave ... Any of the system wide error codes |
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420 */ |
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421 EXPORT_C void CEZGZipToFile::ResetL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize) |
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422 { |
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423 delete iBufferManager; |
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424 iBufferManager = NULL; |
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425 InitialiseBufManL(aRfs,aGzFileName,aOutput,aBufferSize); |
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426 iDecompressor->ResetL(*iBufferManager); |
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427 } |
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428 |
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429 /** |
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430 De-compresses the current zip file in stages. The function needs to called again until the de-compression |
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431 is finalised, in which case it will return EFalse - for example... |
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432 |
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433 @code |
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434 while ( decompressor->InflateL() ) |
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435 { |
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436 // No action required |
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437 } |
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438 @endcode |
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439 |
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440 @leave KEZlibErrBadGZipCrc Invalid CRC check |
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441 @leave ... Any of the system wide error codes |
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442 @return ETrue if the de-compression is not complete, and function must be called again |
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443 @return EFalse if the de-compression is finalised |
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444 */ |
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445 EXPORT_C TBool CEZGZipToFile::InflateL() |
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446 { |
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447 TBool keepGoing = iDecompressor->InflateL(); |
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448 |
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449 if (!keepGoing) |
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450 { |
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451 if (iBufferManager->Crc() != iTrailer.iCrc32) |
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452 { |
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453 User::Leave(KEZlibErrBadGZipCrc); |
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454 |
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455 } |
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456 iGZipFile.Close(); |
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457 } |
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458 |
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459 return keepGoing; |
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460 } |
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461 |
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462 void CEZGZipToFile::InitialiseBufManL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize) |
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463 { |
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464 EZGZipFile::LocateAndReadTrailerL(aRfs,aGzFileName,iTrailer); |
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465 User::LeaveIfError(iGZipFile.Open(aRfs,aGzFileName,EFileStream | EFileRead | EFileShareAny)); |
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466 EZGZipFile::ReadHeaderL(iGZipFile,iHeader); |
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467 iBufferManager = CEZGzipToFileBM::NewL(iGZipFile,aOutput,aBufferSize); |
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468 } |
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469 |
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470 void CEZGZipToFile::ConstructL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize) |
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471 { |
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472 InitialiseBufManL(aRfs,aGzFileName,aOutput,aBufferSize); |
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473 |
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474 // this is a special zlib modification to stop it choking when it can't find the normal zlib stream header. |
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475 |
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476 iDecompressor = CEZDecompressor::NewL(*iBufferManager,-CEZDecompressor::EMaxWBits); |
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477 } |
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478 |
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479 |
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480 //-------------------------------------------------------------------------------------------------------- |
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481 |
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482 |
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483 CEZFileToGZip::CEZFileToGZip() : iCompressor(NULL), iBufferManager(NULL) |
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484 { |
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485 |
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486 } |
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487 |
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488 CEZFileToGZip::~CEZFileToGZip() |
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489 { |
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490 delete iCompressor; |
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491 delete iBufferManager; |
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492 iGZipFile.Close(); |
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493 } |
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494 |
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495 /** |
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496 Creates a new CEZFileToGZip object and leaves it on the CleanupStack |
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497 |
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498 @param aRfs open file server session |
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499 @param aGzFileName the name of the target zip file |
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500 @param aInput the file to compress |
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501 @param aBufferSize required size of buffers |
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502 @return a pointer to the new CEZFileToGZip object, left on the CleanupStack |
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503 */ |
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504 EXPORT_C CEZFileToGZip* CEZFileToGZip::NewLC(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize) |
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505 { |
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506 CEZFileToGZip* com = new (ELeave) CEZFileToGZip; |
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507 CleanupStack::PushL(com); |
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508 com->ConstructL(aRfs,aGzFileName,aInput,aBufferSize); |
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509 return com; |
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510 } |
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511 |
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512 /** |
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513 Creates a new CEZFileToGZip object and leaves it on the CleanupStack |
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514 |
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515 @param aRfs open file server session |
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516 @param aGzFileName the name of the target zip file |
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517 @param aInput the file to compress |
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518 @param aBufferSize required size of buffers |
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519 @return a pointer to the new CEZFileToGZip object, left on the CleanupStack |
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520 */ |
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521 EXPORT_C CEZFileToGZip* CEZFileToGZip::NewL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize) |
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522 { |
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523 CEZFileToGZip* com = new (ELeave) CEZFileToGZip; |
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524 CleanupStack::PushL(com); |
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525 com->ConstructL(aRfs,aGzFileName,aInput,aBufferSize); |
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526 CleanupStack::Pop(); |
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527 return com; |
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528 } |
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529 |
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530 /** |
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531 Quits the current compression operation and restarts with the specified arguments |
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532 |
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533 @param aRfs open file server session |
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534 @param aGzFileName the name of the target zip file |
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535 @param aInput the file to compress |
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536 @param aBufferSize required size of buffers |
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537 @leave ... Any of the system wide error codes |
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538 */ |
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539 EXPORT_C void CEZFileToGZip::ResetL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize) |
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540 { |
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541 delete iBufferManager; |
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542 iBufferManager = NULL; |
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543 InitialiseBufManL(aRfs,aGzFileName,aInput,aBufferSize); |
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544 iCompressor->ResetL(*iBufferManager); |
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545 } |
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546 |
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547 /** |
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548 Compresses the current file in stages. The function needs to called again until the compression |
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549 is finalised, in which case it will return EFalse - for example... |
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550 |
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551 @code |
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552 while ( compressor->DeflateL() ) |
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553 { |
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554 // No action required |
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555 } |
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556 @endcode |
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557 |
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558 @leave ... Any of the system wide error codes |
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559 @return ETrue if the compression is not complete, and function must be called again |
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560 @return EFalse if the compression is finalised |
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561 */ |
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562 EXPORT_C TBool CEZFileToGZip::DeflateL() |
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563 { |
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564 TBool keepgoing = iCompressor->DeflateL(); |
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565 if (!keepgoing) |
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566 { |
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567 TEZGZipTrailer trailer(iBufferManager->Crc(), iUncompressedDataSize); |
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568 EZGZipFile::WriteTrailerL(iGZipFile, trailer); |
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569 iGZipFile.Close(); |
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570 } |
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571 |
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572 return keepgoing; |
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573 } |
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574 |
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575 void CEZFileToGZip::InitialiseBufManL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize) |
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576 { |
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577 User::LeaveIfError(aInput.Size(iUncompressedDataSize)); |
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578 TInt err; |
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579 |
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580 err = iGZipFile.Create(aRfs, aGzFileName,EFileStream | EFileWrite | EFileShareExclusive); |
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581 if (err == KErrAlreadyExists) |
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582 User::LeaveIfError(iGZipFile.Open(aRfs,aGzFileName,EFileStream | EFileWrite | EFileShareExclusive)); |
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583 else |
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584 User::LeaveIfError(err); |
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585 |
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586 EZGZipFile::WriteHeaderL(iGZipFile,iHeader); |
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587 iBufferManager = CEZFileToGzipBM::NewL(aInput,iGZipFile,aBufferSize); |
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588 } |
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589 |
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590 void CEZFileToGZip::ConstructL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize) |
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591 { |
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592 InitialiseBufManL(aRfs,aGzFileName,aInput,aBufferSize); |
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593 |
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594 // this is a special zlib modification to stop zlib writing out its normal zlib stream header. |
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595 |
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596 iCompressor = CEZCompressor::NewL(*iBufferManager,CEZCompressor::EDefaultCompression,-CEZCompressor::EMaxWBits); |
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597 } |