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1 // Copyright (c) 1996-2009 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 the License "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 // f32\sfsrv\cl_fraw.cpp |
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15 // |
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16 // |
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17 |
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18 #include "cl_std.h" |
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19 |
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20 |
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21 |
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22 |
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23 /** |
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24 Opens a direct access channel to the disk. |
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25 |
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26 Other resources are disabled from accessing the disk until Close() is called. |
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27 |
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28 Note that if any resources are currently open on the disk, an error |
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29 is returned. |
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30 |
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31 @param aFs The file server session. |
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32 @param aDrive The drive containing the disk to be accessed. Specify a drive |
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33 in the range EDriveA to EDriveZ for drives A to Z. |
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34 |
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35 @return KErrNone, if successful; |
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36 KErrInUse is returned if any resources are currently open on the disk; |
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37 otherwise one of the other system-wide error codes. |
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38 |
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39 @capability TCB |
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40 |
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41 */ |
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42 EXPORT_C TInt RRawDisk::Open(RFs& aFs,TInt aDrive) |
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43 { |
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44 if (!RFs::IsValidDrive(aDrive)) |
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45 return(KErrArgument); |
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46 iDrive=aDrive; |
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47 return(CreateSubSession(aFs,EFsRawDiskOpen,TIpcArgs(aDrive))); |
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48 } |
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49 |
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50 |
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51 |
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52 |
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53 /** |
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54 Closes the direct access channel to the disk, and allows other resources |
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55 to access the disk. |
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56 */ |
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57 EXPORT_C void RRawDisk::Close() |
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58 { |
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59 CloseSubSession(EFsRawSubClose); |
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60 } |
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61 |
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62 |
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63 |
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64 |
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65 /** |
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66 Reads directly from the disk. |
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67 |
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68 The function reads a number of bytes into the specified descriptor from |
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69 the disk, beginning at the specified position. |
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70 |
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71 @param aPos The position on the disk at which to begin reading. |
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72 @param aDes The descriptor into which data is to be read. |
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73 On return aDes contains the data read. |
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74 |
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75 @panic User In debug builds, the media driver panics if aPos is larger than |
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76 the size of the physical media or if the end address, given by |
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77 aPos + the maximum length of the descriptor, is greater than |
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78 the size of the physical media. |
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79 |
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80 @return KErrNone, if successful, otherwise one of the other system-wide error |
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81 codes. |
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82 |
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83 @capability TCB |
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84 |
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85 */ |
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86 EXPORT_C TInt RRawDisk::Read(TInt64 aPos,TDes8& aDes) |
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87 { |
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88 TInt maxLength = aDes.MaxLength(); |
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89 if (maxLength==0) |
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90 return(KErrNone); |
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91 TPtrC8 tBuf((TUint8*)&aPos,sizeof(TInt64)); |
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92 return(SendReceive(EFsRawDiskRead,TIpcArgs(&aDes,maxLength,&tBuf))); |
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93 } |
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94 |
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95 |
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96 |
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97 |
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98 /** |
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99 Writes directly to the disk. |
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100 |
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101 The function writes the contents of the specified descriptor to the |
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102 disk at position aPos. |
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103 |
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104 @param aPos The position at which to begin writing. |
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105 @param aDes The descriptor containing the data to be written to the disk. |
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106 |
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107 @panic User In debug builds, the media driver panics if aPos is larger than |
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108 the size of the physical media or if the end address, given by |
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109 aPos + the maximum length of the descriptor, is greater than |
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110 the size of the physical media. |
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111 |
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112 @return KErrNone, if successful, otherwise one of the other system-wide error |
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113 codes. |
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114 |
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115 @capability TCB |
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116 |
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117 */ |
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118 EXPORT_C TInt RRawDisk::Write(TInt64 aPos,TDesC8& aDes) |
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119 { |
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120 TInt length = aDes.Length(); |
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121 if (length==0) |
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122 return(KErrNone); |
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123 TPtrC8 tBuf((TUint8*)&aPos,sizeof(TInt64)); |
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124 return(SendReceive(EFsRawDiskWrite,TIpcArgs(&aDes,length,&tBuf))); |
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125 } |
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126 |
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127 |
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128 |
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129 |
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130 // |
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131 // Old read / write methods left in to be BC |
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132 // |
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133 class _RRawDisk : public RRawDisk |
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134 { |
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135 public: |
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136 IMPORT_C TInt Read(TInt aPos,TDes8& aDes); |
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137 IMPORT_C TInt Write(TInt aPos,TDesC8& aDes); |
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138 }; |
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139 |
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140 |
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141 |
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142 |
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143 /** |
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144 Reads directly from the disk. |
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145 |
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146 The function reads a number of bytes into the specified descriptor from |
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147 the disk beginning at the specified position. |
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148 |
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149 @param aPos The position on the disk at which to begin reading. |
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150 @param aDes The descriptor into which data is to be read. On return, contains the |
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151 data read. The number of bytes read is the smaller of: |
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152 a) the total number of bytes on the disk minus aPos; |
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153 b) the maximum length of the descriptor. |
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154 |
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155 @return KErrNone, if successful, otherwise one of the other system-wide error |
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156 codes. |
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157 |
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158 @capability TCB |
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159 @deprecated |
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160 */ |
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161 EXPORT_C TInt _RRawDisk::Read(TInt aPos,TDes8& aDes) |
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162 { |
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163 TInt maxLength = aDes.MaxLength(); |
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164 if (maxLength==0) |
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165 return(KErrNone); |
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166 TInt64 pos = MAKE_TINT64(0,aPos); |
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167 TPtrC8 tBuf((TUint8*)&pos,sizeof(TInt64)); |
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168 return(SendReceive(EFsRawDiskRead,TIpcArgs(&aDes,maxLength,&tBuf))); |
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169 } |
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170 |
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171 |
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172 |
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173 |
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174 /** |
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175 Writes directly to the disk. |
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176 |
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177 The function writes the contents of the specified descriptor to the |
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178 disk at position aPos. |
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179 |
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180 @param aPos The position at which to begin writing. |
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181 @param aDes The descriptor containing the data to be written to the disk. |
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182 |
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183 @return KErrNone, if successful, otherwise one of the other system-wide error |
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184 codes. |
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185 |
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186 @capability TCB |
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187 @deprecated |
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188 */ |
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189 EXPORT_C TInt _RRawDisk::Write(TInt aPos,TDesC8& aDes) |
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190 { |
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191 TInt length = aDes.Length(); |
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192 if (length==0) |
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193 return(KErrNone); |
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194 TInt64 pos = MAKE_TINT64(0,aPos); |
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195 TPtrC8 tBuf((TUint8*)&pos,sizeof(TInt64)); |
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196 return(SendReceive(EFsRawDiskWrite,TIpcArgs(&aDes,length,&tBuf))); |
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197 } |