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 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
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 *  Lesser General Public License for more details.
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 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
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 *  Source License Version 1.1 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
 *  License at http://www.openoffice.org/license.html.
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#include "first.hxx"
#include "assert.h"
namespace OpenStormBento
{

unsigned long
CBenValue::GetValueSize()
{
    unsigned long Size = 0;
    pCBenValueSegment pCurr = NULL;
    while ((pCurr = GetNextValueSegment(pCurr)) != NULL)
        Size += pCurr->GetSize();
    return Size;
}

BenError
CBenValue::ReadValueData(BenDataPtr pReadBuffer, unsigned long Offset,
  unsigned long Amt, unsigned long * pAmtRead)
{
    BenError Err;
    unsigned long SegOffset = 0;
    *pAmtRead = 0;
    pCBenValueSegment pCurrSeg = NULL;
    pLtcBenContainer pContainer = GetContainer();
    BenByteDataPtr pBuffer = (BenByteDataPtr) pReadBuffer;

    /// pReadBuffer -- pointer to buffer of read result, allocated outside this function
    /// Offset          -- read buffer's start offset address, relative value in the whole value stream
    /// Amt             -- read buffer's size
    /// pAmtRead    -- return the actual read size

    /// SegOffset     -- current segment's start address offset, relative value in the whole value stream

    while ((pCurrSeg = GetNextValueSegment(pCurrSeg)) != NULL)
    {
        if (Amt == 0)               /// whole buffer is full now, so return
            return BenErr_OK;

        if (SegOffset <= Offset && Offset < SegOffset + pCurrSeg->GetSize()) /// begin at current segment
        {
            unsigned long OffsetIntoSeg = Offset - SegOffset;  /// relative value in this value segment stream

            unsigned long AmtThisSeg = UtMin(Amt, pCurrSeg->GetSize() -
                OffsetIntoSeg);           /// size read in this segment, it's minimal value between Amt &
                                          /// remain part from OffsetIntoSeg to the end of this segment

            unsigned long AmtReadThisSeg; /// actual read size in this segment
            if (pCurrSeg->IsImmediate())
            {
                UtHugeMemcpy(pBuffer, pCurrSeg->GetImmediateData() +
                  OffsetIntoSeg, AmtThisSeg);
                AmtReadThisSeg = AmtThisSeg;
            }
            else
            {
                if ((Err = pContainer->SeekToPosition(pCurrSeg->GetPosition() +
                        OffsetIntoSeg)) != BenErr_OK)
                    return Err;

                if ((Err = pContainer->Read(pBuffer, AmtThisSeg,
                                            &AmtReadThisSeg)) != BenErr_OK)
                    return Err;
            }

            *pAmtRead += AmtReadThisSeg;

            if (AmtThisSeg != AmtReadThisSeg)
                return BenErr_UnexpectedEndOfFile;

            pBuffer += AmtReadThisSeg;
            Offset += AmtReadThisSeg;
            Amt -= AmtReadThisSeg;
        }

        SegOffset += pCurrSeg->GetSize();
    }
    return BenErr_OK;
}

}//end namespace OpenStormBento

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