1#[allow(dead_code)] const X: u16 = 0xffff;
10
11const FORWARD_TABLE: &[u16] = &[
12 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146,
13 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 7682, 7683, 163, 266,
14 267, 7690, 167, 7808, 169, 7810, 7691, 7922, 173, 174, 376, 7710, 7711, 288, 289, 7744, 7745,
15 182, 7766, 7809, 7767, 7811, 7776, 7923, 7812, 7813, 7777, 192, 193, 194, 195, 196, 197, 198,
16 199, 200, 201, 202, 203, 204, 205, 206, 207, 372, 209, 210, 211, 212, 213, 214, 7786, 216, 217,
17 218, 219, 220, 221, 374, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236,
18 237, 238, 239, 373, 241, 242, 243, 244, 245, 246, 7787, 248, 249, 250, 251, 252, 253, 375, 255,
19]; #[inline]
23pub fn forward(code: u8) -> u16 {
24 FORWARD_TABLE[(code - 0x80) as usize]
25}
26
27#[cfg(not(feature = "no-optimized-legacy-encoding"))]
28const BACKWARD_TABLE_LOWER: &[u8] = &[
29 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
30 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
31 168, 184, 170, 186, 189, 190, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
32 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33 0, 0, 0, 0, 208, 240, 222, 254, 175, 0, 0, 0, 0, 0, 0, 0, 180, 181, 0, 0, 0, 0, 0, 0, 0, 0, 0,
34 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 183, 185, 0, 0, 0, 0, 0, 0, 0, 0, 187, 191, 0, 0, 0, 0, 0, 0,
35 0, 0, 215, 247, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 164, 165, 0, 0, 0,
36 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 178, 179, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
37 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 161, 162, 0, 0, 0, 0, 0, 0, 166, 171,
38 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 176, 177, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
39 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
40 0, 0, 0, 0, 0, 0, 0, 0, 172, 188, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 129, 130, 131, 132,
41 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151,
42 152, 153, 154, 155, 156, 157, 158, 159, 160, 0, 0, 163, 0, 0, 0, 167, 0, 169, 0, 0, 0, 173,
43 174, 0, 0, 0, 0, 0, 0, 0, 182, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 193, 194, 195, 196, 197, 198,
44 199, 200, 201, 202, 203, 204, 205, 206, 207, 0, 209, 210, 211, 212, 213, 214, 0, 216, 217, 218,
45 219, 220, 221, 0, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237,
46 238, 239, 0, 241, 242, 243, 244, 245, 246, 0, 248, 249, 250, 251, 252, 253, 0, 255,
47]; #[cfg(not(feature = "no-optimized-legacy-encoding"))]
50const BACKWARD_TABLE_UPPER: &[u16] = &[
51 0, 0, 352, 416, 194, 76, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
52 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 256, 140, 64,
55 288,
56]; #[inline]
60#[cfg(not(feature = "no-optimized-legacy-encoding"))]
61pub fn backward(code: u32) -> u8 {
62 let offset = (code >> 6) as usize;
63 let offset = if offset < 124 {BACKWARD_TABLE_UPPER[offset] as usize} else {0};
64 BACKWARD_TABLE_LOWER[offset + ((code & 63) as usize)]
65}
66
67#[cfg(feature = "no-optimized-legacy-encoding")]
69pub fn backward(code: u32) -> u8 {
70 if code > 7923 || ((0x40000003u32 >> (code >> 8)) & 1) == 0 { return 0; }
71 let code = code as u16;
72 for i in 0..0x80 {
73 if FORWARD_TABLE[i as usize] == code { return 0x80 + i; }
74 }
75 0
76}
77
78#[cfg(test)]
79encoding_index_tests::single_byte_tests! {
80}