| author | sl@SLION-WIN7.fritz.box |
| Fri, 15 Jun 2012 03:10:57 +0200 | |
| changeset 0 | bde4ae8d615e |
| permissions | -rw-r--r-- |
| sl@0 | 1 |
/* |
| sl@0 | 2 |
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
| sl@0 | 3 |
* All rights reserved. |
| sl@0 | 4 |
* This component and the accompanying materials are made available |
| sl@0 | 5 |
* under the terms of the License "Eclipse Public License v1.0" |
| sl@0 | 6 |
* which accompanies this distribution, and is available |
| sl@0 | 7 |
* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
| sl@0 | 8 |
* |
| sl@0 | 9 |
* Initial Contributors: |
| sl@0 | 10 |
* Nokia Corporation - initial contribution. |
| sl@0 | 11 |
* |
| sl@0 | 12 |
* Contributors: |
| sl@0 | 13 |
* |
| sl@0 | 14 |
* Description: |
| sl@0 | 15 |
* |
| sl@0 | 16 |
*/ |
| sl@0 | 17 |
// |
| sl@0 | 18 |
// tmsmemmap.cpp |
| sl@0 | 19 |
// |
| sl@0 | 20 |
// Maps a position to mass storage address space |
| sl@0 | 21 |
// |
| sl@0 | 22 |
|
| sl@0 | 23 |
/** @file |
| sl@0 | 24 |
@internalTechnology |
| sl@0 | 25 |
*/ |
| sl@0 | 26 |
|
| sl@0 | 27 |
#include <e32def.h> |
| sl@0 | 28 |
#include <e32err.h> |
| sl@0 | 29 |
|
| sl@0 | 30 |
#include "tmsmemmap.h" |
| sl@0 | 31 |
#include "debug.h" |
| sl@0 | 32 |
|
| sl@0 | 33 |
|
| sl@0 | 34 |
TMsDataMemMap::TMsDataMemMap() |
| sl@0 | 35 |
{
|
| sl@0 | 36 |
__MSFNSLOG |
| sl@0 | 37 |
Reset(); |
| sl@0 | 38 |
} |
| sl@0 | 39 |
|
| sl@0 | 40 |
|
| sl@0 | 41 |
/** |
| sl@0 | 42 |
Checks that the block is within the limits of the media memory address space |
| sl@0 | 43 |
and truncates the length if block extends beyond media size. |
| sl@0 | 44 |
|
| sl@0 | 45 |
@param aPos [IN] Position of start address [OUT] Adjusted position to real |
| sl@0 | 46 |
address on media. |
| sl@0 | 47 |
@param aLength [IN] Number of bytes [OUT] Number of bytes truncated in case |
| sl@0 | 48 |
of block overflow. |
| sl@0 | 49 |
|
| sl@0 | 50 |
@return TInt KErrNone if block fits. KErrArgument if start position is |
| sl@0 | 51 |
greater than the media size. KErrEof if block extends beyond media size. |
| sl@0 | 52 |
*/ |
| sl@0 | 53 |
TInt TMsDataMemMap::TranslateDataPos(TInt64& aPos, TInt& aLength) const |
| sl@0 | 54 |
{
|
| sl@0 | 55 |
__MSFNSLOG |
| sl@0 | 56 |
// Map to the actual position on the media |
| sl@0 | 57 |
aPos += iDataOffset; |
| sl@0 | 58 |
|
| sl@0 | 59 |
if (aPos > iSize) |
| sl@0 | 60 |
{
|
| sl@0 | 61 |
return KErrArgument; |
| sl@0 | 62 |
} |
| sl@0 | 63 |
|
| sl@0 | 64 |
TInt64 endPos = aPos + aLength; |
| sl@0 | 65 |
if (endPos > iSize) |
| sl@0 | 66 |
{
|
| sl@0 | 67 |
aLength = iSize - aPos; |
| sl@0 | 68 |
return KErrEof; |
| sl@0 | 69 |
} |
| sl@0 | 70 |
return KErrNone; |
| sl@0 | 71 |
} |
| sl@0 | 72 |
|
| sl@0 | 73 |
/** |
| sl@0 | 74 |
Checks that the block is within the limits of the media memory address space |
| sl@0 | 75 |
|
| sl@0 | 76 |
@param aPos [IN] Position of start address [OUT] Adjusted position to real |
| sl@0 | 77 |
address on media. |
| sl@0 | 78 |
@param aLength Number of bytes. |
| sl@0 | 79 |
|
| sl@0 | 80 |
@return TInt KErrNone if block fits. KErrArgument if start position is |
| sl@0 | 81 |
greater than the media size. KErrEof if block extends beyond media size. |
| sl@0 | 82 |
*/ |
| sl@0 | 83 |
TInt TMsDataMemMap::CheckBlockInRange(TInt64& aPos, TInt aLength) const |
| sl@0 | 84 |
{
|
| sl@0 | 85 |
__MSFNSLOG |
| sl@0 | 86 |
// Map to the actual position on the media |
| sl@0 | 87 |
aPos += iDataOffset; |
| sl@0 | 88 |
|
| sl@0 | 89 |
if (aPos > iSize) |
| sl@0 | 90 |
{
|
| sl@0 | 91 |
return KErrArgument; |
| sl@0 | 92 |
} |
| sl@0 | 93 |
|
| sl@0 | 94 |
TInt64 endPos = aPos + aLength; |
| sl@0 | 95 |
if (endPos > iSize) |
| sl@0 | 96 |
{
|
| sl@0 | 97 |
__PXYPRINT2(_L("EOF found 0x%lx x%x"), aPos, aLength);
|
| sl@0 | 98 |
return KErrEof; |
| sl@0 | 99 |
} |
| sl@0 | 100 |
|
| sl@0 | 101 |
return KErrNone; |
| sl@0 | 102 |
} |