/// <summary>
/// Performs application-defined tasks associated with freeing,
/// releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
if (!_memoryBlock.IsInvalid)
{
_memoryBlock.Dispose();
_memoryBlock = _invalidBlock;
}
}
/// <summary>
/// Ensures that there is sufficient memory allocated.
/// </summary>
/// <param name="capacity">
/// The required capacity of the block, in bytes.
/// </param>
/// <exception cref="OutOfMemoryException">
/// There is insufficient memory to satisfy the request.
/// </exception>
public void EnsureCapacity(int capacity)
{
int currentSize = _memoryBlock.IsInvalid ? 0 : _memoryBlock.Size;
if (capacity > currentSize)
{
if (0 != currentSize) currentSize <<= 1;
if (capacity > currentSize) currentSize = capacity;
if (!_memoryBlock.IsInvalid) _memoryBlock.Dispose();
_memoryBlock = SafeHGlobalHandle.Allocate(currentSize);
}
}
/// <summary>
/// Ensures that there is sufficient memory allocated.
/// </summary>
/// <param name="capacity">
/// The required capacity of the block, in bytes.
/// </param>
/// <exception cref="OutOfMemoryException">
/// There is insufficient memory to satisfy the request.
/// </exception>
public void EnsureCapacity(int capacity)
{
int currentSize = _memoryBlock.IsInvalid ? 0 : _memoryBlock.Size;
if (capacity > currentSize)
{
if (0 != currentSize)
{
currentSize <<= 1;
}
if (capacity > currentSize)
{
currentSize = capacity;
}
if (!_memoryBlock.IsInvalid)
{
_memoryBlock.Dispose();
}
_memoryBlock = SafeHGlobalHandle.Allocate(currentSize);
}
}
private static extern bool BackupRead(
SafeFileHandle hFile,
SafeHGlobalHandle pBuffer,
int numberOfBytesToRead,
out int numberOfBytesRead,
[MarshalAs(UnmanagedType.Bool)] bool abort,
[MarshalAs(UnmanagedType.Bool)] bool processSecurity,
ref IntPtr context);
