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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 // |
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15 |
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16 #include "readers.h" |
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17 |
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18 // Descriptors support a maximum of 2^28 bytes. |
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19 // The highest 4 bits are used for other purposes. |
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20 static const TInt KMaxDesLen = (2 << 28) - 1; |
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21 static const TInt KMinDesLen = -(2 << 28); |
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22 |
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23 // |
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24 // |
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25 // |
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26 CBufferReader::CBufferReader(const TDesC8& aBuffer) |
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27 : CReader(aBuffer, CReader::EBuffer) |
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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 // |
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33 // |
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34 CBufferReader::CBufferReader(const TDesC8& aBuffer, TReaderType aType) |
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35 : CReader(aBuffer, aType) |
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36 { |
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37 } |
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38 |
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39 // |
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40 // |
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41 // |
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42 CBufferReader::~CBufferReader() |
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43 { |
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44 } |
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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 CBufferReader* CBufferReader::NewLC(const TDesC8& aBuffer) |
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50 { |
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51 CBufferReader* self = new(ELeave) CBufferReader(aBuffer); |
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52 CleanupStack::PushL(self); |
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53 self->ConstructL(); |
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54 return self; |
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55 } |
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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 void CBufferReader::ConstructL() |
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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 // |
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67 void CBufferReader::Reset() |
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68 { |
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69 CReader::Reset(); |
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70 } |
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71 |
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72 // |
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73 // |
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74 // |
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75 void CBufferReader::SeekL(TInt64 aOffset) |
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76 { |
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77 // Symbian OS descriptors support a maximum size of 2^28 bytes. |
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78 if (aOffset > (TInt64)KMaxDesLen) |
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79 { |
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80 User::Leave(KErrNotSupported); |
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81 } |
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82 |
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83 if (aOffset < (TInt64)KMinDesLen) |
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84 { |
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85 User::Leave(KErrNotSupported); |
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86 } |
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87 |
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88 TInt low = (TInt)I64LOW(aOffset); |
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89 SeekL(low); |
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90 } |
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91 |
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92 // |
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93 // |
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94 // |
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95 void CBufferReader::SeekL(TInt aOffset) |
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96 { |
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97 User::LeaveIfError(CReader::Seek(aOffset)); |
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98 } |
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99 |