base64decoding

const base64decoding: array [0..255] of Byte = ($ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $3e, $ff, $ff, $ff, $3f, $34, $35, $36, $37, $38, $39, $3a, $3b, $3c, $3d, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $00, $01, $02, $03, $04, $05, $06, $07, $08, $09, $0a, $0b, $0c, $0d, $0e, $0f, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $ff, $ff, $ff, $ff, $ff, $ff, $1a, $1b, $1c, $1d, $1e, $1f, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $2a, $2b, $2c, $2d, $2e, $2f, $30, $31, $32, $33, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff, $ff);