/// <summary>Byte swap a given structure a number of times over a range of bytes</summary>
/// <param name="definition">Structure definition in terms of byte swap codes</param>
/// <param name="buffer">Buffer containing the bytes of an instance of the definition</param>
/// <param name="startIndex">Where to start processing the definition in the buffer</param>
/// <param name="count">Number of times to process the definition on the buffer</param>
/// <returns>Offset in <paramref name="buffer"/> where processing ended</returns>
public static int SwapData(IByteSwappable definition, byte[] buffer,
int startIndex = 0, int count = 1)
{
Contract.Requires <ArgumentNullException>(definition != null);
Contract.Requires <ArgumentNullException>(buffer != null);
Contract.Requires <ArgumentOutOfRangeException>(startIndex >= 0);
Contract.Requires <ArgumentOutOfRangeException>(startIndex <= buffer.Length);
Contract.Requires <ArgumentOutOfRangeException>(count > 0);
Contract.Requires <ArgumentOutOfRangeException>((count * definition.SizeOf) <= (buffer.Length - startIndex),
"buffer doesn't have enough data for the given byte swap parameters");
Contract.Ensures(Contract.Result <int>() >= 0);
if (count == 0)
{
return(startIndex);
}
var swap = new Swapper(definition);
int buffer_index = startIndex;
for (int elements_remaining = count; elements_remaining > 0; elements_remaining--)
{
buffer_index = swap.SwapData(buffer, buffer_index);
}
Contract.Assert(buffer_index == (startIndex + (definition.SizeOf * count)));
return(buffer_index);
}
public Swapper(IByteSwappable definition)
{
Contract.Requires <ArgumentNullException>(definition != null);
kCodes = definition.ByteSwapCodes;
}