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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "Wm5CorePCH.h"
#include "Wm5BufferIO.h"
#include "Wm5Endian.h"
#include "Wm5Memory.h"
using namespace Wm5;
//----------------------------------------------------------------------------
BufferIO::BufferIO ()
:
mBuffer(0),
mNumBytesTotal(0),
mNumBytesProcessed(0),
mMode(BM_NONE)
{
}
//----------------------------------------------------------------------------
BufferIO::BufferIO (int numBytesTotal, char* buffer, int mode)
:
mBuffer(0),
mNumBytesTotal(0),
mNumBytesProcessed(0),
mMode(BM_NONE)
{
Open(numBytesTotal, buffer, mode);
}
//----------------------------------------------------------------------------
BufferIO::~BufferIO ()
{
if (mMode != BM_NONE)
{
Close();
}
}
//----------------------------------------------------------------------------
bool BufferIO::Open (int numBytesTotal, char* buffer, int mode)
{
if (mMode == BM_NONE)
{
if (buffer && numBytesTotal > 0)
{
mBuffer = buffer;
mNumBytesTotal = numBytesTotal;
mNumBytesProcessed = 0;
mMode = mode;
return true;
}
assertion(false, "Failed to open buffer\n");
}
else
{
assertion(false, "Buffer %s is already open\n");
}
return false;
}
//----------------------------------------------------------------------------
bool BufferIO::Close ()
{
mBuffer = 0;
mNumBytesTotal = 0;
mNumBytesProcessed = 0;
mMode = BM_NONE;
return false;
}
//----------------------------------------------------------------------------
bool BufferIO::IncrementNumBytesProcessed (int numBytes)
{
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
if (numBytes <= 0)
{
assertion(false, "Increment must be positive\n");
return false;
}
#endif
int nextBytesProcessed = mNumBytesProcessed + numBytes;
if (nextBytesProcessed <= mNumBytesTotal)
{
mNumBytesProcessed = nextBytesProcessed;
return true;
}
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
assertion(false, "Increment exceeds buffer size\n");
#endif
mNumBytesProcessed = mNumBytesTotal;
return false;
}
//----------------------------------------------------------------------------
bool BufferIO::Read (size_t itemSize, void* datum)
{
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
if ((mMode != BM_READ && mMode != BM_READ_AND_SWAP) || !datum
|| (itemSize != 1 && itemSize != 2 && itemSize != 4 && itemSize != 8))
{
assertion(false, "Invalid BufferIO::Read\n");
return false;
}
#endif
int nextBytesProcessed = mNumBytesProcessed + (int)itemSize;
if (nextBytesProcessed <= mNumBytesTotal)
{
char* source = mBuffer + mNumBytesProcessed;
mNumBytesProcessed = nextBytesProcessed;
memcpy(datum, source, itemSize);
if (mMode == BM_READ_AND_SWAP && itemSize > 1)
{
Endian::Swap(itemSize, datum);
}
return true;
}
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
assertion(false, "Invalid BufferIO::Read\n");
#endif
mNumBytesProcessed = mNumBytesTotal;
return false;
}
//----------------------------------------------------------------------------
bool BufferIO::Read (size_t itemSize, int numItems, void* data)
{
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
if ((mMode != BM_READ && mMode != BM_READ_AND_SWAP) || numItems <= 0
|| !data
|| (itemSize != 1 && itemSize != 2 && itemSize != 4 && itemSize != 8))
{
assertion(false, "Invalid BufferIO::Read\n");
return false;
}
#endif
int numToCopy = ((int)itemSize)*numItems;
int nextBytesProcessed = mNumBytesProcessed + numToCopy;
if (nextBytesProcessed <= mNumBytesTotal)
{
char* source = mBuffer + mNumBytesProcessed;
mNumBytesProcessed = nextBytesProcessed;
memcpy(data, source, (size_t)numToCopy);
if (mMode == BM_READ_AND_SWAP && itemSize > 1)
{
Endian::Swap(itemSize, numItems, data);
}
return true;
}
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
assertion(false, "Invalid BufferIO::Read\n");
#endif
mNumBytesProcessed = mNumBytesTotal;
return false;
}
//----------------------------------------------------------------------------
bool BufferIO::Write (size_t itemSize, const void* datum)
{
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
if ((mMode != BM_WRITE && mMode != BM_WRITE_AND_SWAP) || !datum
|| (itemSize != 1 && itemSize != 2 && itemSize != 4 && itemSize != 8))
{
assertion(false, "Invalid BufferIO::Write\n");
return false;
}
#endif
int nextBytesProcessed = mNumBytesProcessed + (int)itemSize;
if (nextBytesProcessed <= mNumBytesTotal)
{
char* target = mBuffer + mNumBytesProcessed;
mNumBytesProcessed = nextBytesProcessed;
memcpy(target, datum, itemSize);
if (mMode == BM_WRITE_AND_SWAP && itemSize > 1)
{
Endian::Swap(itemSize, target);
}
return true;
}
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
assertion(false, "Invalid BufferIO::Write\n");
#endif
mNumBytesProcessed = mNumBytesTotal;
return false;
}
//----------------------------------------------------------------------------
bool BufferIO::Write (size_t itemSize, int numItems, const void* data)
{
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
if ((mMode != BM_WRITE && mMode != BM_WRITE_AND_SWAP) || numItems <= 0
|| !data
|| (itemSize != 1 && itemSize != 2 && itemSize != 4 && itemSize != 8))
{
assertion(false, "Invalid BufferIO::Write\n");
return false;
}
#endif
int numToCopy = ((int)itemSize)*numItems;
int nextBytesProcessed = mNumBytesProcessed + numToCopy;
if (nextBytesProcessed <= mNumBytesTotal)
{
char* target = mBuffer + mNumBytesProcessed;
mNumBytesProcessed = nextBytesProcessed;
memcpy(target, data, (size_t)numToCopy);
if (mMode == BM_WRITE_AND_SWAP && itemSize > 1)
{
Endian::Swap(itemSize, numItems, target);
}
return true;
}
#ifdef WM5_BUFFERIO_VALIDATE_OPERATION
assertion(false, "Invalid BufferIO::Write\n");
#endif
mNumBytesProcessed = mNumBytesTotal;
return false;
}
//----------------------------------------------------------------------------
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