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/*
*
* Copyright (C) 2007-2010, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: dcmdata
*
* Author: Marco Eichelberg
*
* Purpose: Implementation of class DcmWriteCache
*
*/
#include "dcmtk/config/osconfig.h" /* make sure OS specific configuration is included first */
#include "dcmtk/dcmdata/dcwcache.h" /* for class DcmWriteCache */
#include "dcmtk/dcmdata/dcelem.h" /* for class DcmElement */
#include "dcmtk/dcmdata/dcostrma.h" /* for class DcmOutputStream */
void DcmWriteCache::init(void *owner,
Uint32 fieldLength,
Uint32 bytesTransferred,
E_ByteOrder byteOrder)
{
if (! buf_)
{
capacity_ = DcmWriteCacheBufsize;
buf_ = new Uint8[capacity_];
}
if (owner != owner_)
{
owner_ = owner;
fieldLength_ = fieldLength;
fieldOffset_ = bytesTransferred;
byteOrder_ = byteOrder;
offset_ = 0;
numBytes_ = 0;
}
}
OFCondition DcmWriteCache::fillBuffer(DcmElement& elem)
{
OFCondition result = EC_Normal;
if (buf_)
{
// re-fill the buffer only if completely empty
if (! numBytes_)
{
offset_ = 0;
// compute the number of bytes to read - either buffer size or
// the remaining number of bytes in the element, whatever is smaller
Uint32 bytesToRead = fieldLength_ - fieldOffset_;
if (bytesToRead > capacity_) bytesToRead = capacity_;
result = elem.getPartialValue(buf_, fieldOffset_, bytesToRead, &fcache_, byteOrder_);
if (result.good())
{
numBytes_ = bytesToRead;
fieldOffset_ += numBytes_;
}
}
} else result = EC_IllegalCall;
return result;
}
Uint32 DcmWriteCache::writeBuffer(DcmOutputStream &outStream)
{
Uint32 result = 0;
if (buf_ && numBytes_)
{
result = OFstatic_cast(Uint32, outStream.write(buf_ + offset_, numBytes_));
numBytes_ -= result;
offset_ += result;
}
return result;
}
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