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// distribution boxbackup-0.11rc1 (svn version: 2023_2024)
//
// Copyright (c) 2003 - 2006
// Ben Summers and contributors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. All use of this software and associated advertising materials must
// display the following acknowledgment:
// This product includes software developed by Ben Summers.
// 4. The names of the Authors may not be used to endorse or promote
// products derived from this software without specific prior written
// permission.
//
// [Where legally impermissible the Authors do not disclaim liability for
// direct physical injury or death caused solely by defects in the software
// unless it is modified by a third party.]
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//
//
// --------------------------------------------------------------------------
//
// File
// Name: PartialReadStream.h
// Purpose: Read part of another stream
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
#include "Box.h"
#include "PartialReadStream.h"
#include "CommonException.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: PartialReadStream::PartialReadStream(IOStream &,
// pos_type)
// Purpose: Constructor, taking another stream and the number of
// bytes to be read from it.
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
PartialReadStream::PartialReadStream(IOStream &rSource,
pos_type BytesToRead)
: mrSource(rSource),
mBytesLeft(BytesToRead)
{
ASSERT(BytesToRead > 0);
}
// --------------------------------------------------------------------------
//
// Function
// Name: PartialReadStream::~PartialReadStream()
// Purpose: Destructor. Won't absorb any unread bytes.
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
PartialReadStream::~PartialReadStream()
{
// Warn in debug mode
if(mBytesLeft != 0)
{
TRACE1("PartialReadStream::~PartialReadStream when mBytesLeft = %d\n", mBytesLeft);
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: PartialReadStream::Read(void *, int, int)
// Purpose: As interface.
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
int PartialReadStream::Read(void *pBuffer, int NBytes, int Timeout)
{
// Finished?
if(mBytesLeft <= 0)
{
return 0;
}
// Asking for more than is allowed?
if(NBytes > mBytesLeft)
{
// Adjust downwards
NBytes = mBytesLeft;
}
// Route the request to the source
int read = mrSource.Read(pBuffer, NBytes, Timeout);
ASSERT(read <= mBytesLeft);
// Adjust the count
mBytesLeft -= read;
// Return the number read
return read;
}
// --------------------------------------------------------------------------
//
// Function
// Name: PartialReadStream::BytesLeftToRead()
// Purpose: As interface.
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
IOStream::pos_type PartialReadStream::BytesLeftToRead()
{
return mBytesLeft;
}
// --------------------------------------------------------------------------
//
// Function
// Name: PartialReadStream::Write(const void *, int)
// Purpose: As interface. But will exception.
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
void PartialReadStream::Write(const void *pBuffer, int NBytes)
{
THROW_EXCEPTION(CommonException, CantWriteToPartialReadStream)
}
// --------------------------------------------------------------------------
//
// Function
// Name: PartialReadStream::StreamDataLeft()
// Purpose: As interface.
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
bool PartialReadStream::StreamDataLeft()
{
return mBytesLeft != 0;
}
// --------------------------------------------------------------------------
//
// Function
// Name: PartialReadStream::StreamClosed()
// Purpose: As interface.
// Created: 2003/08/26
//
// --------------------------------------------------------------------------
bool PartialReadStream::StreamClosed()
{
// always closed
return true;
}
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