/// <summary>
/// Function to copy the contents of a byte array into the memory pointed at by the pointer.
/// </summary>
/// <typeparam name="T">Type of data in the array.</typeparam>
/// <param name="destination">Destination pointer.</param>
/// <param name="source">Source array to copy from.</param>
/// <param name="sourceIndex">Index to start copying from in the source array.</param>
/// <param name="size">Number of bytes to copy.</param>
/// <remarks>Since a pointer doesn't have a size associated with it, care must be taken to not overstep the bounds of the data pointed at by the pointer.</remarks>
/// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="source"/> parameter is NULL (Nothing in VB.Net).</exception>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown if the size + sourceIndex is greater than the number of elements in the source parameter.
/// <para>-or-</para>
/// <para>Thrown if the sourceIndex is less than 0.</para>
/// </exception>
public static void CopyFrom <T>(this IntPtr destination, T[] source, int sourceIndex, int size)
where T : struct
{
#if DEBUG
int typeSize = DirectAccess.SizeOf <T>();
if (destination == IntPtr.Zero)
{
throw new ArgumentNullException("destination");
}
if (source == null)
{
throw new ArgumentNullException("source");
}
if (sourceIndex < 0)
{
throw new ArgumentOutOfRangeException("sourceIndex",
string.Format(Resources.GOR_INDEX_OUT_OF_RANGE, sourceIndex,
source.Length));
}
if ((sourceIndex * typeSize) + size > source.Length * typeSize)
{
throw new ArgumentOutOfRangeException("sourceIndex",
string.Format(Resources.GOR_INDEX_OUT_OF_RANGE,
sourceIndex * typeSize + size,
source.Length));
}
#endif
DirectAccess.WriteArray(destination, source, sourceIndex, size);
}
/// <summary>
/// Function to copy the contents of a byte array into the memory pointed at by the pointer.
/// </summary>
/// <param name="destination">Destination pointer.</param>
/// <param name="source">Source array to copy from.</param>
/// <param name="sourceIndex">Index to start copying from in the source array.</param>
/// <param name="size">Number of bytes to copy.</param>
/// <remarks>Since a pointer doesn't have a size associated with it, care must be taken to not overstep the bounds of the data pointed at by the pointer.</remarks>
/// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="source"/> parameter is NULL (Nothing in VB.Net).</exception>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown if the size + sourceIndex is greater than the number of elements in the source parameter.
/// <para>-or-</para>
/// <para>Thrown if the sourceIndex is less than 0.</para>
/// </exception>
public static void CopyFrom(this IntPtr destination, byte[] source, int sourceIndex, int size)
{
if (destination == IntPtr.Zero)
{
return;
}
#if DEBUG
if (destination == IntPtr.Zero)
{
throw new ArgumentNullException("destination");
}
if (source == null)
{
throw new ArgumentNullException("destination");
}
if (sourceIndex < 0)
{
throw new ArgumentOutOfRangeException("sourceIndex",
string.Format(Resources.GOR_INDEX_OUT_OF_RANGE, sourceIndex,
source.Length));
}
if (sourceIndex + size > source.Length)
{
throw new ArgumentOutOfRangeException("sourceIndex",
string.Format(Resources.GOR_INDEX_OUT_OF_RANGE, sourceIndex + size,
source.Length));
}
#endif
DirectAccess.WriteArray(destination, source, sourceIndex, size);
}
/// <summary>
/// Function to write a range of generic values.
/// </summary>
/// <typeparam name="T">Type of value to write. Must be a value type.</typeparam>
/// <param name="value">Array of values to write.</param>
/// <param name="startIndex">Starting index in the array.</param>
/// <param name="count">Number of array elements to copy.</param>
/// <exception cref="System.ArgumentNullException">Thrown when the <paramref name="value"/> parameter is NULL (Nothing in VB.Net).</exception>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown when the <paramref name="startIndex"/> parameter is less than 0.
/// <para>-or-</para>
/// <para>Thrown when the startIndex parameter is equal to or greater than the number of elements in the value parameter.</para>
/// <para>-or-</para>
/// <para>Thrown when the sum of startIndex and <paramref name="count"/> is greater than the number of elements in the value parameter.</para>
/// </exception>
/// <exception cref="System.IO.IOException">Thrown when the stream is read-only.</exception>
public unsafe void WriteRange <T>(T[] value, int startIndex, int count)
where T : struct
{
ValidateAccess(true);
if (value == null)
{
throw new ArgumentNullException("value");
}
if ((value.Length == 0) || (count <= 0))
{
return;
}
if ((startIndex < 0) || (startIndex >= value.Length))
{
throw new ArgumentOutOfRangeException(string.Format(Resources.GOR_INDEX_OUT_OF_RANGE, startIndex,
value.Length));
}
if (startIndex + count > value.Length)
{
throw new ArgumentOutOfRangeException(string.Format(Resources.GOR_INDEX_OUT_OF_RANGE, startIndex + count,
value.Length));
}
int typeSize = DirectAccess.SizeOf <T>();
int offset = typeSize * startIndex;
int size = typeSize * count;
// Allocate our temporary buffer if we haven't already.
if (TempBuffer == null)
{
TempBuffer = new byte[TempBufferSize];
}
fixed(byte *tempBufferPointer = &TempBuffer[0])
{
while (size > 0)
{
int blockSize = size > TempBufferSize ? TempBufferSize : size;
// Read our array into our temporary byte buffer.
DirectAccess.WriteArray(tempBufferPointer, value, offset, blockSize);
offset += blockSize;
size -= size;
// Write the temporary byte buffer to the stream.
Write(TempBuffer, 0, blockSize);
}
}
}
