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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 // |
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18 // tmsmemmap.cpp |
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19 // |
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20 // Maps a position to mass storage address space |
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21 // |
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22 |
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23 /** @file |
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24 @internalTechnology |
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25 */ |
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26 |
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27 #include <e32def.h> |
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28 #include <e32def_private.h> |
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29 #include <e32err.h> |
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30 #include <e32debug.h> |
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31 |
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32 #include "tmsmemmap.h" |
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33 #include "debug.h" |
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34 |
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35 |
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36 TMsDataMemMap::TMsDataMemMap() |
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37 { |
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38 __MSFNSLOG |
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39 Reset(); |
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40 } |
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41 |
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42 |
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43 /** |
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44 Checks that the block is within the limits of the media memory address space |
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45 and truncates the length if block extends beyond media size. |
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46 |
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47 @param aPos [IN] Position of start address [OUT] Adjusted position to real |
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48 address on media. |
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49 @param aLength [IN] Number of bytes [OUT] Number of bytes truncated in case |
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50 of block overflow. |
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51 |
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52 @return TInt KErrNone if block fits. KErrArgument if start position is |
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53 greater than the media size. KErrEof if block extends beyond media size. |
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54 */ |
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55 TInt TMsDataMemMap::TranslateDataPos(TInt64& aPos, TInt& aLength) const |
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56 { |
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57 __MSFNSLOG |
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58 // Map to the actual position on the media |
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59 aPos += iDataOffset; |
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60 |
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61 if (aPos > iSize) |
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62 { |
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63 return KErrArgument; |
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64 } |
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65 |
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66 TInt64 endPos = aPos + aLength; |
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67 if (endPos > iSize) |
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68 { |
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69 aLength = iSize - aPos; |
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70 return KErrEof; |
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71 } |
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72 return KErrNone; |
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73 } |
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74 |
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75 /** |
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76 Checks that the block is within the limits of the media memory address space |
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77 |
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78 @param aPos [IN] Position of start address [OUT] Adjusted position to real |
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79 address on media. |
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80 @param aLength Number of bytes. |
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81 |
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82 @return TInt KErrNone if block fits. KErrArgument if start position is |
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83 greater than the media size. KErrEof if block extends beyond media size. |
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84 */ |
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85 TInt TMsDataMemMap::CheckBlockInRange(TInt64& aPos, TInt aLength) const |
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86 { |
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87 __MSFNSLOG |
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88 // Map to the actual position on the media |
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89 aPos += iDataOffset; |
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90 |
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91 if (aPos > iSize) |
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92 { |
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93 return KErrArgument; |
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94 } |
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95 |
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96 TInt64 endPos = aPos + aLength; |
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97 if (endPos > iSize) |
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98 { |
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99 __PXYPRINT2(_L("EOF found 0x%lx x%x"), aPos, aLength); |
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100 return KErrEof; |
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101 } |
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102 |
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103 return KErrNone; |
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104 } |