mirror of
https://github.com/mastodon/mastodon-ios.git
synced 2024-12-25 16:23:30 +01:00
46 lines
1.5 KiB
Swift
46 lines
1.5 KiB
Swift
|
import Foundation
|
||
|
|
|
||
|
|
private let DecodeTable: [UInt32] = [
|
||
|
|
0xff, 0x44, 0xff, 0x54, 0x53, 0x52, 0x48, 0xff,
|
||
|
|
0x4b, 0x4c, 0x46, 0x41, 0xff, 0x3f, 0x3e, 0x45,
|
||
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
||
|
|
0x08, 0x09, 0x40, 0xff, 0x49, 0x42, 0x4a, 0x47,
|
||
|
|
0x51, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a,
|
||
|
|
0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32,
|
||
|
|
0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
|
||
|
|
0x3b, 0x3c, 0x3d, 0x4d, 0xff, 0x4e, 0x43, 0xff,
|
||
|
|
0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
|
||
|
|
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
|
||
|
|
0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
|
||
|
|
0x21, 0x22, 0x23, 0x4f, 0xff, 0x50, 0xff, 0xff
|
||
|
|
]
|
||
|
|
|
||
|
|
extension String {
|
||
|
|
func decode85() -> Data {
|
||
|
|
var data = Data()
|
||
|
|
var block: UInt32 = 0
|
||
|
|
var n = 0
|
||
|
|
for c in utf8 {
|
||
|
|
if c >= 32, c < 128, DecodeTable[Int(c - 32)] != 0xff {
|
||
|
|
let value = DecodeTable[Int(c - 32)]
|
||
|
|
block = block * 85 + value
|
||
|
|
n += 1
|
||
|
|
if n == 5 {
|
||
|
|
data.append(UInt8(block >> 24))
|
||
|
|
data.append(UInt8((block >> 16) & 0xff))
|
||
|
|
data.append(UInt8((block >> 8) & 0xff))
|
||
|
|
data.append(UInt8(block & 0xff))
|
||
|
|
block = 0
|
||
|
|
n = 0
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if n >= 4 { data.append(UInt8((block >> 16) & 0xff)) }
|
||
|
|
if n >= 3 { data.append(UInt8((block >> 8) & 0xff)) }
|
||
|
|
if n >= 2 { data.append(UInt8(block & 0xff)) }
|
||
|
|
|
||
|
|
return data
|
||
|
|
}
|
||
|
|
}
|