/*

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   This module contains the implementation of CCrTemplate class. 

*

*/

//  INCLUDE FILES

#include "crdata.h"

// -----------------------------------------------------------------------------

// CCrData

// Constructors

// These functions construct CCrData object.

// -----------------------------------------------------------------------------

CCrData::CCrData()  : iIsFile(ETrue), iPointer(0), iBuffer(NULL)

    { 

    }

CCrData::CCrData(TBool aIsFile) : iIsFile(aIsFile), iPointer(0), iBuffer(NULL), iPath(NULL)

    {

    }

// -----------------------------------------------------------------------------

// CCrData

// Destructor

// This function destructs CCrData object.

// -----------------------------------------------------------------------------

CCrData::~CCrData()

    {

    if (iBuffer != NULL)

        {

        delete iBuffer;

        }

    if (iPath != NULL)

        {

        delete iPath;

        }

    }

// -----------------------------------------------------------------------------

// CCrData::ConstructL

// This function initializes CCrData object's member objects.

// -----------------------------------------------------------------------------

TAny CCrData::ConstructL()

    {

    if (iIsFile == EFalse)

        {

        iBuffer = HBufC8::NewL(0);

        iPath = HBufC::NewL(0);

        }

    }

// -----------------------------------------------------------------------------

// CCrData::NewLC

// -----------------------------------------------------------------------------

EXPORT_C CCrData* CCrData::NewLC(TBool aIsFile) // default value ETrue

    {

    CCrData* self = new CCrData(aIsFile);

    CleanupStack::PushL(self);

    self->ConstructL();

    return self; 

    }

// -----------------------------------------------------------------------------

// CCrData::NewL

// -----------------------------------------------------------------------------

EXPORT_C CCrData* CCrData::NewL(TBool aIsFile) // default value ETrue

    {

    CCrData* self = NewLC(aIsFile);

    CleanupStack::Pop();

    return self; 

    }

// -----------------------------------------------------------------------------

// CCrData::Open

// Opens an existing file for reading or writing. If the file 

// does not already exist, an error is returned.

// Parameters:    aFs The file server session

//                aName The name of the file. Any path 

//                      components which are not specified here will be 

//                      taken from the session path.

//                aFileMode The mode in which the file is opened. 

//                          For more information see EFileShareExclusive and 

//                          other file sharing and access modes.

// Return Values:  TInt KErrNone if successful, otherwise

//                 another of the system-wide error codes.

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::Open(RFs& aFs,const TDesC& aName,TUint aFileMode)

    {

    if (iIsFile) // file

        {

        TInt result = iFile.Open(aFs, aName, aFileMode);

        SetPathL(aName);

        return result;

        }

    else // Buffer

        {

        return KErrNotSupported; 

        }

    }

EXPORT_C TInt CCrData::Open(RFs& aFs,TUint aFileMode)

    {

    TInt result = KErrNone;

    if (iIsFile) // file

        {

        if (iPath != NULL)

            {

            result = iFile.Open(aFs, *iPath, aFileMode);

            }

        else

            {

            result = KErrPathNotFound;

            }

        }

    else // Buffer

        {

        result = KErrNotSupported; 

        }

    return result;

    }

// -----------------------------------------------------------------------------

// CCrData::Replace

// Replaces a file. If there is an existing file with the same

// name, this function will overwrite it. If the file does not 

// already exist, this function creates it.

// Parameters:    aFs The file server session

//                aName The name of the file. 

//                      Any path components which are not specified 

//                      here will be taken from the session path.

//                 aFileMode The mode in which the file  is opened. 

//                           For more information see EFileShareExclusive and 

//                           other file sharing and access modes. Note that the 

//                           access mode is set to 

//                           EFileWrite whatever the caller specifies.

// Return Values:  KErrNone if successful, otherwise

//                 another of the system-wide error codes.

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::Replace(RFs& aFs, const TDesC& aName, TUint aFileMode)

    {

    if (iIsFile) // File

        {

        TInt result = iFile.Replace(aFs, aName, aFileMode);

        return result;

        }

    else // Buffer

        {

        return KErrNotSupported; 

        }  

    }

// -----------------------------------------------------------------------------

// CCrData::Close

// Closes the file. Any open files are closed when the file server 

// session is closed. Close() is guaranteed to return, and provides 

// no indication of whether it completed successfully or not. When 

// closing a file that you have written to, you should ensure that

// data is committed to the file by invoking RFile::Flush() before 

// closing. If Flush() completes successfully, Close() is essentially 

// a no-operation.

// -----------------------------------------------------------------------------

EXPORT_C void CCrData::Close()

    {

    if (iIsFile) // File

        {

        iFile.Close();

        return; 

        }

    else // Buffer

        {

        return; 

        }      

    }

// -----------------------------------------------------------------------------

// CCrData::Read

// Reading transfers data from a file (or a buffer) to a descriptor.

// If CCrData object is created to be a file function only call 

// RFile::Read(.), but if CCrData is buffer, function makes same things

// to buffer as RFile::Read make to file. (See EPOC documentation)

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::Read(TDes8& aDes)

    {

    TInt err = KErrNone;

    if (!iIsFile)                            // CCrData is buf 

        {       

        if (aDes.MaxLength() < iBuffer->Length())

            {

            err = KErrOverflow;

            }

        else 

            {

            aDes.Copy(*iBuffer);            // Copy iBuffer to aDes

            iPointer = aDes.Length();       // Set pointer to end of buf

            }           

        }

    else                                    // else it is file

        {  

        err = iFile.Read(aDes); 

        }

    return err;                             // error code

    }

EXPORT_C TInt CCrData::Read(TDes8& aDes,TInt aLength)

    {

    TInt err = KErrNone;

    TInt i;

    if (!iIsFile)                           // CCrData is buffer

        {       

        if ((aLength < NULL) || (aLength > aDes.MaxLength())) 

            {

            err = KErrGeneral;

            }

        else 

            {

            aDes.Zero();

            for (i = iPointer; (i < (aLength + iPointer)) &&

                (i < iBuffer->Length()); i++)

                {

                aDes.Append((*iBuffer)[i]);        // append data to aDes

                }

            iPointer = i;                   // set pointer to next byte

            }

        }

    else                                    // else CCrData is file

        {

        err = iFile.Read(aDes, aLength);

        }

    return err;

    }

EXPORT_C TInt CCrData::Read(TInt aPos,TDes8& aDes,TInt aLength)

    {

    TInt i;

    TInt err = KErrNone;

    if (!iIsFile)                           // CCrDAta is buffer 

        {       

        if (aLength < NULL)                 // aLength must be positive 

            {   

            err = KErrArgument;

            }

        else if (aLength > aDes.MaxLength()) // if buffer is too small 

            {

            err = KErrOverflow;            

            }

        else 

            {

            aDes.Delete(0, aDes.Length());  // delete old string

            TPtr8 ptr = iBuffer->Des();         

            for (i = aPos; (i < (aLength + aPos)) &&

                (i < iBuffer->Length()); i++)

                {

                aDes.Append(ptr[i]);

                }

            iPointer  = i;                  // set pointer to end of read       

            }

        }

    else                                    // CCrData is file

        { 

        err = iFile.Read(aPos, aDes, aLength);

        }

    return err;

    }

// -----------------------------------------------------------------------------

// CCrData::Write

// Writing transfers data from a descriptor to a buffer or file.

// If CCrData object is created to be a file function only call 

// RFile::Write(.), but if CCrData is buffer, function makes same things

// to buffer as RFile::Write make to file. After Write(..) iPointer is moved

// to end of the buffer. 

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::Write(const TDesC8& aDes)

    { 

    TInt err = KErrNone;

    if (!iIsFile)                           // buf

        {

        err = Write(aDes, aDes.Length()); 

        }

     else                                    // file

        {

        err = iFile.Write(aDes);

        }

    return err;

    }

EXPORT_C TInt CCrData::Write(const TDesC8& aDes, TInt aLength)

    { 

    TInt err = KErrNone;

    if (aLength < NULL)                     // aLen must be positive 

        {                                   

        err = KErrArgument;           

        }

    if (!iIsFile)                           // buf

        { 

        TInt bufferLength = iBuffer->Length();

        TInt neededBufferLength = iPointer + aLength;

        if (neededBufferLength > bufferLength) // Reallocation is needed

            {

            TRAP(err, iBuffer = iBuffer->ReAllocL(neededBufferLength)); 

            if (err != KErrNone)

                    {

                    return KErrNoMemory;

                    }

            }

        TPtr8 ptr = iBuffer->Des();             

        // append new data, ONLY the amount of aLength

        if (aLength == aDes.Length())

            {

            ptr.Append(aDes); 

            }

        else // aLength < a.Des.Length()

            {

            ptr.Append(aDes.Left(aLength));

            }

        // iPointer is moved to the end of the buffer.        

        iPointer = iBuffer->Length();

        }

    else                                    // file

        {

        err = iFile.Write(aDes);

        }

    return err;

    }

// -----------------------------------------------------------------------------

// CCrData::Zero

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::Zero(const TInt aPos, const TInt aLength)

    {

	TPtr8 ptr = iBuffer->Des();

	if (ptr.Length() < aPos + aLength)

	    {

		// Out of bounds

		return KErrArgument;

	    }

	for (TInt i = 0; i < aLength; i++)

	    {

		ptr[aPos+i] = 0;

	    }

	return KErrNone;

    }

// -----------------------------------------------------------------------------

// CCrData::Seek

// If CCrData object is created to be a file function only call 

// RFile::Seek(.), but if CCrData is buffer, function makes same things

// to buffer as RFile::Seek make to file. (See EPOC documentation)

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::Seek(TSeek aMode,TInt& aPos)

    {

    TInt err = KErrNone;

    if (aPos < NULL)                        // aPos must be positive

        {

        err = KErrArgument;

        }

    else if (!iIsFile)                      // CCrData is buffer

        {

        switch (aMode)

            {

            case (ESeekCurrent):            // this place

                {

                iPointer += aPos;              

                break;

                }

            case (ESeekStart):              // from start of buf

                {                

                iPointer = aPos;   

                break;

                }

            case (ESeekEnd):                // from end of buf 

                {

                iPointer = iBuffer->Length() - aPos;

                break;

                }

            default:

                {

                break;                      // ESeekAddress

                }

            }

            if (iPointer < NULL)            // iPointer must be positive

                {

                iPointer = NULL;            // set pointer to start of buf

                }

            else if (iPointer > iBuffer->Length())

                {

                iPointer = iBuffer->Length();   // set pointer to end of buf

                }

            aPos = iPointer;

        }

    else                                    // CCrData is file

        {       

        err = iFile.Seek(aMode, aPos);

        }

    return err;

    }

// -----------------------------------------------------------------------------

// CCrData::Size

// Reading the size of data.

// If CCrData is a buffer, returns length of the buffer. Otherwise 

// calls RFile::Size( TInt ).

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::Size(TInt& aSize)

    {

    TInt err = KErrNone;

    if (!iIsFile)                            // CCrData is buf 

        {       

        aSize = iBuffer->Length();

        }

    else                                    // else it is file

        {  

        err = iFile.Size(aSize); 

        }

    return err;                             // error code

    }

// -----------------------------------------------------------------------------

// CCrData::LineL

// LineL sets data from the current place, where iPointer is, till next new

// line character to aLine. 

// iPointer moves to the following item from the found new line character.

// If no new line character is found, aLine is the rest of the data and 

// iPointer is moved to the end of the iBuffer or the iFile.

// Return Values:  KErrNone if everything succeeds

//                 KErrNoMemory if aLine is not length enough

//                 KErrEof if iPointer is at the end of file.

// -----------------------------------------------------------------------------

EXPORT_C TInt CCrData::LineL(TDes8& aLine)

    {

    TBufC8<2> newLine(KNewLine);  // New line

    // Area to find the new line

    TInt size = 0;

    Size(size);

    TInt currentPlace = iPointer;

    TInt neededLengthToFind = size - currentPlace;

    if(neededLengthToFind == 0) // If the area is empty

        {

        return KErrEof;

        }

    TInt newLinePlace = 0;

    if (!iIsFile) // CCrData is a buffer.

        {

        TPtrC8 temp = iBuffer->Mid(currentPlace, neededLengthToFind);

        // Find next new line.

        newLinePlace = temp.Find(newLine);

        // If not found, return the whole area.

        if (newLinePlace == KErrNotFound)

            {

            newLinePlace = neededLengthToFind;

            }

        else

            {

            newLinePlace = newLinePlace + newLine.Length();

            }

        if (aLine.MaxLength() < newLinePlace)

            {

            return KErrNoMemory;

            }

        // Put the line to aLine

        aLine = temp.Left(newLinePlace);

        }

    else // CCrData is a file.

        {

        HBufC8* tempBuf = HBufC8::NewL(neededLengthToFind);

        TDes8 tempDes = tempBuf->Des();

        // Read data to a buffer from iPointer to end of file