1#[allow(dead_code)] const X: u16 = 0xffff;
10
11const FORWARD_TABLE: &[u16] = &[
12 8364, 129, 8218, 402, 8222, 8230, 8224, 8225, 710, 8240, 352, 8249, 338, 141, 142, 143, 144,
13 8216, 8217, 8220, 8221, 8226, 8211, 8212, 732, 8482, 353, 8250, 339, 157, 158, 376, 160, 161,
14 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180,
15 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
16 200, 201, 202, 203, 204, 205, 206, 207, 286, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218,
17 219, 220, 304, 350, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237,
18 238, 239, 287, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 305, 351, 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,
31 136, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 152, 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, 153, 0, 0,
33 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, 208, 240,
34 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 221, 253, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
35 0, 0, 0, 0, 0, 0, 140, 156, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 254, 138, 154, 0, 0, 0, 0, 0, 0,
36 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 159, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
37 0, 0, 0, 0, 131, 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,
38 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
39 0, 0, 0, 0, 0, 0, 0, 0, 150, 151, 0, 0, 0, 145, 146, 130, 0, 147, 148, 132, 0, 134, 135, 149,
40 0, 0, 0, 133, 0, 0, 0, 0, 0, 0, 0, 0, 0, 137, 0, 0, 0, 0, 0, 0, 0, 0, 139, 155, 0, 0, 0, 0, 0,
41 129, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 141, 142, 143, 144, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
42 157, 158, 0, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
43 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194,
44 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 0, 209, 210, 211, 212, 213,
45 214, 215, 216, 217, 218, 219, 220, 0, 0, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
46 234, 235, 236, 237, 238, 239, 0, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 0,
47 0, 255,
48]; #[cfg(not(feature = "no-optimized-legacy-encoding"))]
51const BACKWARD_TABLE_UPPER: &[u16] = &[
52 0, 0, 358, 422, 123, 173, 230, 0, 0, 0, 0, 58, 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, 0, 0, 0, 0, 0,
55 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,
56 0, 0, 0, 0, 295, 0, 250, 0, 88,
57]; #[inline]
61#[cfg(not(feature = "no-optimized-legacy-encoding"))]
62pub fn backward(code: u32) -> u8 {
63 let offset = (code >> 6) as usize;
64 let offset = if offset < 133 {BACKWARD_TABLE_UPPER[offset] as usize} else {0};
65 BACKWARD_TABLE_LOWER[offset + ((code & 63) as usize)]
66}
67
68#[cfg(feature = "no-optimized-legacy-encoding")]
70pub fn backward(code: u32) -> u8 {
71 if code > 8482 || ((0x10003u32 >> (code >> 9)) & 1) == 0 { return 0; }
72 let code = code as u16;
73 for i in 0..0x80 {
74 if FORWARD_TABLE[i as usize] == code { return 0x80 + i; }
75 }
76 0
77}
78
79#[cfg(test)]
80encoding_index_tests::single_byte_tests! {
81}