public void WriteBytes(long offset, byte[] array, int arrayOffset, int sizeBytes)
{
var readPtr = _memoryPtr + offset - _bufferOffset;
fixed(byte *dest = array)
{
AccessorHelper.Memcpy(readPtr, dest + arrayOffset, sizeBytes);
}
}
public void WriteBytes(long offset, byte *array, int sizeBytes)
{
while (sizeBytes > 0)
{
byte *ptr = GetFilePart(offset);
// Page size - absolute offset % Page siez
long end = (1 << _bitHint) - ((offset + FILE_HEADER_LENGTH) & ((1 << _bitHint) - 1));
// Respect buffer size.
var readSize1 = (int)Math.Min(end, sizeBytes);
AccessorHelper.Memcpy(ptr, array, readSize1);
offset += readSize1;
sizeBytes -= readSize1;
array += readSize1;
}
}
public void WriteBytes(long offset, byte *array, int sizeBytes)
{
var readPtr = _memoryPtr + offset - _bufferOffset;
AccessorHelper.Memcpy(readPtr, array, sizeBytes);
}
public unsafe void ReadBytes(long offset, byte *array, int sizeBytes)
{
var readPtr = _memoryPtr + offset - _bufferOffset;
AccessorHelper.Memcpy(array, readPtr, sizeBytes);
}
private byte *MapBuffer(long bufferIndex, long offset)
{
lock (_buffSync)
{
if (bufferIndex < _pointersArrayLen)
{
var ptr = _pointersArray[bufferIndex];
if (ptr != null)
{
return(ptr + offset);
}
}
else
{
// Add empty.
long newLen = bufferIndex + ADDITIONAL_BUFFER_ARRAY_CAPACITY;
var newBuffers = new IRawFilePart[newLen];
Array.Copy(_buffers, 0, newBuffers, 0, _pointersArrayLen);
var newPtrArray = LongAllocate((int)newLen);
AccessorHelper.Memcpy((byte *)newPtrArray, (byte *)_pointersArray, (int)(sizeof(byte *) * _pointersArrayLen));
var oldPtrArray = _pointersArray;
Thread.MemoryBarrier();
_pointersArray = newPtrArray;
Thread.MemoryBarrier();
_pointersArrayLen = newLen;
_pointersArrayFixedLen = newLen;
_buffers = newBuffers;
Marshal.FreeHGlobal((IntPtr)oldPtrArray);
}
// Create.
int bufferSize = 1 << _bitHint;
long bufferOffset = bufferIndex * bufferSize;
IRawFilePart view;
if (Access == EFileAccess.Read)
{
var maxSize = _compositeFile.CheckSize();
if (bufferOffset + bufferSize > maxSize)
{
if (maxSize < bufferOffset)
{
// Only last buffer can be incompletely mapped.
// The file should be re-mapped on higher level.
throw new NFSdbInvalidReadException(
"Attempt to read chunk in the middle of the file '{0}' with mismatched offset. File size {1}, buffer offset {2}.",
Filename, maxSize, bufferOffset);
}
if (_incompleteBufferMapped)
{
// Only last buffer can be incompletely mapped.
// The file should be re-mapped on higher level.
throw new NFSdbInvalidReadException(
"Attempt to read file '{0}' at {1}. Only one incomplete buffer allowed.",
Filename, bufferOffset + offset);
}
bufferSize = (int)(maxSize - bufferOffset);
_incompleteBufferMapped = true;
_pointersArrayFixedLen = bufferIndex;
}
}
view = _compositeFile.CreateViewAccessor(bufferOffset, bufferSize);
_buffers[bufferIndex] = view;
var address = view.Pointer - view.BufferOffset + FILE_HEADER_LENGTH;
Thread.MemoryBarrier();
_pointersArray[bufferIndex] = address;
Interlocked.Add(ref _mappedSize, bufferSize);
return(_pointersArray[bufferIndex] + offset);
}
}
