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Diffstat (limited to 'lib/common/MemBlockStream.cpp')
| -rw-r--r-- | lib/common/MemBlockStream.cpp | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/lib/common/MemBlockStream.cpp b/lib/common/MemBlockStream.cpp new file mode 100644 index 00000000..99c73779 --- /dev/null +++ b/lib/common/MemBlockStream.cpp @@ -0,0 +1,273 @@ +// distribution boxbackup-0.10 (svn version: 494) +// +// 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: MemBlockStream.cpp +// Purpose: Stream out data from any memory block +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- + +#include "Box.h" + +#include <string.h> + +#include "MemBlockStream.h" +#include "CommonException.h" +#include "StreamableMemBlock.h" +#include "CollectInBufferStream.h" + +#include "MemLeakFindOn.h" + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::MemBlockStream() +// Purpose: Constructor (doesn't copy block, careful with lifetimes) +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +MemBlockStream::MemBlockStream(const void *pBuffer, int Size) + : mpBuffer((char*)pBuffer), + mBytesInBuffer(Size), + mReadPosition(0) +{ + ASSERT(pBuffer != 0); + ASSERT(Size >= 0); +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::MemBlockStream(const StreamableMemBlock &) +// Purpose: Constructor (doesn't copy block, careful with lifetimes) +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +MemBlockStream::MemBlockStream(const StreamableMemBlock &rBlock) + : mpBuffer((char*)rBlock.GetBuffer()), + mBytesInBuffer(rBlock.GetSize()), + mReadPosition(0) +{ + ASSERT(mpBuffer != 0); + ASSERT(mBytesInBuffer >= 0); +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::MemBlockStream(const StreamableMemBlock &) +// Purpose: Constructor (doesn't copy block, careful with lifetimes) +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +MemBlockStream::MemBlockStream(const CollectInBufferStream &rBuffer) + : mpBuffer((char*)rBuffer.GetBuffer()), + mBytesInBuffer(rBuffer.GetSize()), + mReadPosition(0) +{ + ASSERT(mpBuffer != 0); + ASSERT(mBytesInBuffer >= 0); +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::MemBlockStream(const MemBlockStream &) +// Purpose: Copy constructor +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +MemBlockStream::MemBlockStream(const MemBlockStream &rToCopy) + : mpBuffer(rToCopy.mpBuffer), + mBytesInBuffer(rToCopy.mBytesInBuffer), + mReadPosition(0) +{ + ASSERT(mpBuffer != 0); + ASSERT(mBytesInBuffer >= 0); +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::~MemBlockStream() +// Purpose: Destructor +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +MemBlockStream::~MemBlockStream() +{ +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::Read(void *, int, int) +// Purpose: As interface. But only works in read phase +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +int MemBlockStream::Read(void *pBuffer, int NBytes, int Timeout) +{ + // Adjust to number of bytes left + if(NBytes > (mBytesInBuffer - mReadPosition)) + { + NBytes = (mBytesInBuffer - mReadPosition); + } + ASSERT(NBytes >= 0); + if(NBytes <= 0) return 0; // careful now + + // Copy in the requested number of bytes and adjust the read pointer + ::memcpy(pBuffer, mpBuffer + mReadPosition, NBytes); + mReadPosition += NBytes; + + return NBytes; +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::BytesLeftToRead() +// Purpose: As interface. But only works in read phase +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +IOStream::pos_type MemBlockStream::BytesLeftToRead() +{ + return (mBytesInBuffer - mReadPosition); +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::Write(void *, int) +// Purpose: As interface. But only works in write phase +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +void MemBlockStream::Write(const void *pBuffer, int NBytes) +{ + THROW_EXCEPTION(CommonException, MemBlockStreamNotSupported) +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::GetPosition() +// Purpose: In write phase, returns the number of bytes written, in read +// phase, the number of bytes to go +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +IOStream::pos_type MemBlockStream::GetPosition() const +{ + return mReadPosition; +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::Seek(pos_type, int) +// Purpose: As interface. +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +void MemBlockStream::Seek(pos_type Offset, int SeekType) +{ + int newPos = 0; + switch(SeekType) + { + case IOStream::SeekType_Absolute: + newPos = Offset; + break; + case IOStream::SeekType_Relative: + newPos = mReadPosition + Offset; + break; + case IOStream::SeekType_End: + newPos = mBytesInBuffer + Offset; + break; + default: + THROW_EXCEPTION(CommonException, IOStreamBadSeekType) + break; + } + + // Make sure it doesn't go over + if(newPos > mBytesInBuffer) + { + newPos = mBytesInBuffer; + } + // or under + if(newPos < 0) + { + newPos = 0; + } + + // Set the new read position + mReadPosition = newPos; +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::StreamDataLeft() +// Purpose: As interface +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +bool MemBlockStream::StreamDataLeft() +{ + return mReadPosition < mBytesInBuffer; +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: MemBlockStream::StreamClosed() +// Purpose: As interface +// Created: 2003/09/05 +// +// -------------------------------------------------------------------------- +bool MemBlockStream::StreamClosed() +{ + return true; +} + |