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/*
*
* Copyright (C) 2002-2024, 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: DcmOutputFileStream and related classes,
* implements streamed output to files.
*
*/
#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmdata/dcostrmf.h"
#include "dcmtk/dcmdata/dcerror.h"
#include "dcmtk/ofstd/ofconsol.h"
BEGIN_EXTERN_C
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
END_EXTERN_C
DcmFileConsumer::DcmFileConsumer(const OFFilename &filename)
: DcmConsumer()
, file_container_()
, file_(file_container_)
, status_(EC_Normal)
{
if (!file_.fopen(filename, "wb"))
{
OFString buffer = OFStandard::getLastSystemErrorCode().message();
status_ = makeOFCondition(OFM_dcmdata, 19, OF_error, buffer.c_str());
}
}
DcmFileConsumer::DcmFileConsumer(FILE *file)
: DcmConsumer()
, file_container_(file)
, file_(file_container_)
, status_(EC_Normal)
{
}
DcmFileConsumer::DcmFileConsumer(OFFile &file)
: DcmConsumer()
, file_container_()
, file_(file)
, status_(EC_Normal)
{
}
DcmFileConsumer::~DcmFileConsumer()
{
file_.fclose();
}
OFBool DcmFileConsumer::good() const
{
return status_.good();
}
OFCondition DcmFileConsumer::status() const
{
return status_;
}
OFBool DcmFileConsumer::isFlushed() const
{
return OFTrue;
}
offile_off_t DcmFileConsumer::avail() const
{
// since we cannot report "unlimited", let's claim that we can still write 2GB.
// Note that offile_off_t is a signed type.
return 2147483647L;
}
offile_off_t DcmFileConsumer::write(const void *buf, offile_off_t buflen)
{
offile_off_t result = 0;
if (buflen && buf && status_.good() && file_.open())
{
#ifdef WRITE_VERY_LARGE_CHUNKS
/* This is the old behaviour prior to DCMTK 3.5.5 */
result = OFstatic_cast(offile_off_t, file_.fwrite(buf, 1, OFstatic_cast(size_t, buflen)));
#else
/* On Windows (at least for some versions of MSVC), calls to fwrite() for more than
* 67,076,095 bytes (a bit less than 64 MByte) fail if we're writing to a network
* share. See MSDN KB899149. As a workaround, we always write in chunks of
* 32M which should hardly negatively affect performance.
*/
#define DcmFileConsumer_MAX_CHUNK_SIZE 33554432 /* 32 MByte */
offile_off_t written;
const char *buf2 = OFstatic_cast(const char *, buf);
while (buflen > DcmFileConsumer_MAX_CHUNK_SIZE)
{
written = OFstatic_cast(offile_off_t, file_.fwrite(buf2, 1, DcmFileConsumer_MAX_CHUNK_SIZE));
result += written;
buf2 += written;
// if we have not written a complete chunk, there is problem; bail out
if (written == DcmFileConsumer_MAX_CHUNK_SIZE) buflen -= DcmFileConsumer_MAX_CHUNK_SIZE; else buflen = 0;
}
// last call to fwrite if the file size is not a multiple of DcmFileConsumer_MAX_CHUNK_SIZE
if (buflen)
{
written = OFstatic_cast(offile_off_t, file_.fwrite(buf2, 1, OFstatic_cast(size_t, buflen)));
result += written;
}
#endif
}
return result;
}
void DcmFileConsumer::flush()
{
// nothing to flush
}
void DcmFileConsumer::fclose()
{
int result = file_.fclose();
if (result)
{
OFString buffer = OFStandard::getLastSystemErrorCode().message();
status_ = makeOFCondition(OFM_dcmdata, 19, OF_error, buffer.c_str());
}
else status_ = EC_Normal;
}
/* ======================================================================= */
DcmOutputFileStream::DcmOutputFileStream(const OFFilename &filename)
: DcmOutputStream(&consumer_) // safe because DcmOutputStream only stores pointer
, consumer_(filename)
{
}
DcmOutputFileStream::DcmOutputFileStream(FILE *file)
: DcmOutputStream(&consumer_) // safe because DcmOutputStream only stores pointer
, consumer_(file)
{
}
DcmOutputFileStream::DcmOutputFileStream(OFFile& file)
: DcmOutputStream(&consumer_) // safe because DcmOutputStream only stores pointer
, consumer_(file)
{
}
OFCondition DcmOutputFileStream::fclose()
{
// last attempt to flush stream before file is closed
flush();
#ifdef DEBUG
if (! isFlushed())
{
DCMDATA_WARN("closing unflushed DcmOutputFileStream, loss of data!");
}
#endif
consumer_.fclose();
return consumer_.status();
}
DcmOutputFileStream::~DcmOutputFileStream()
{
// last attempt to flush stream before file is closed
flush();
#ifdef DEBUG
if (! isFlushed())
{
DCMDATA_WARN("closing unflushed DcmOutputFileStream, loss of data!");
}
#endif
}
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