Array of Byte values used in Decoding values from a 4-byte representation to a 3-byte representation.

TIdDecodeTable = array[1..127] of Byte;

TIdDecodeTable is an Array of Byte values that represent the decoding table used for converting a data in a 4-byte representation to the corresponding 3-byte representation. TIdDecodeTable byte values are indexed from 1 to 127. TIdDecodeTable is used by TIdDecoder4to3 to determine which characters are valid in the table-based alphabet, and the ordinal value of the character in the alphabet.