/// <summary>
/// This is helper method to generate lookup table for decoding strings, encoded with given look up table using various encoding methods (e.g. <see cref="EncodeBinary(Byte[], Int32, Int32, Char[])"/>, <see cref="EncodeBase64(Byte[], Boolean)"/>) in this class.
/// </summary>
/// <param name="encodeLookupTable">The table used to encode binary data.</param>
/// <returns>The array with 256 elements, with character used as index giving the numerical value of it.</returns>
/// <exception cref="IndexOutOfRangeException">If any character in <paramref name="encodeLookupTable"/> has its integer value 256 or greater.</exception>
/// <exception cref="ArgumentNullException">If <paramref name="encodeLookupTable"/> is <c>null</c>.</exception>
public static Int32[] CreateDecodeLookupTable(Char[] encodeLookupTable)
{
ArgumentValidator.ValidateNotNull("Encode lookup table", encodeLookupTable);
var retVal = new Int32[Byte.MaxValue];
retVal.Fill(-1);
for (var i = 0; i < encodeLookupTable.Length; ++i)
{
retVal[(Int32)encodeLookupTable[i]] = i;
}
return(retVal);
}
