/// <summary>
/// Given the <see cref="rawIlByteStream"/> the occurance of
/// </summary>
/// <param name="rawIlByteStream"></param>
/// <param name="opCodes"></param>
/// <returns></returns>
/// <remarks>
/// Pass the metadata token into an assembly's manifest module's <see cref="System.Reflection.Module.ResolveMember(int)"/>
/// to get the <see cref="MethodInfo"/>
/// </remarks>
public static int[] GetOpCodesArgs(byte[] rawIlByteStream, OpCode[] opCodes)
{
if (rawIlByteStream == null)
return null;
var metadataTokens = new List<int>();
//expecting first byte to always be an OpCode, never an arg thereof
for (var i = 0; i < rawIlByteStream.Length; i++)
{
var opCodei = GetOpCodeByValue(rawIlByteStream[i]);
var moveBuffer = GetOpCodeOperandByteSize(opCodei);
if (moveBuffer == 0 || moveBuffer > 4 ||//don't handle IA64 since its not resolvable as a token
(rawIlByteStream.Length <= i + moveBuffer) ||
(opCodes.All(x => opCodei != x)))
{
i = i + moveBuffer;
continue;
}
var metadataToken = 0;
switch (moveBuffer)
{
case 1:
metadataToken = rawIlByteStream[i + 1];
break;
case 2:
metadataToken = ByteArray.ToWord(rawIlByteStream[i + 2], rawIlByteStream[i + 1]);
break;
case 4:
metadataToken = ByteArray.ToDWord(rawIlByteStream[i + 4], rawIlByteStream[i + 3],
rawIlByteStream[i + 2], rawIlByteStream[i + 1]);
break;
}
//get only distinct entries
if (metadataToken != 0 && metadataTokens.All(x => x != metadataToken))
metadataTokens.Add(metadataToken);
i = i + moveBuffer;
}
return metadataTokens.ToArray();
}
