encoding-next-index-singlebyte 1.20180106.0

Index tables for various single-byte character encodings
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102

// AUTOGENERATED FROM index-cp437.txt, ORIGINAL COMMENT FOLLOWS:
//
// Source URL: ftp://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP437.TXT
// Keys have been shifted to be more like WHATWG's indexes.
//
//    Name:     cp437_DOSLatinUS to Unicode table
//    Unicode version: 2.0
//    Table version: 2.00
//    Table format:  Format A
//    Date:          04/24/96
//    Contact: Shawn.Steele@microsoft.com
//
//    General notes: none
//
//    Format: Three tab-separated columns
//        Column #1 is the cp437_DOSLatinUS code (in hex)
//        Column #2 is the Unicode (in hex as 0xXXXX)
//        Column #3 is the Unicode name (follows a comment sign, '#')
//
//    The entries are in cp437_DOSLatinUS order
//

#[allow(dead_code)] const X: u16 = 0xffff;

const FORWARD_TABLE: &[u16] = &[
    199, 252, 233, 226, 228, 224, 229, 231, 234, 235, 232, 239, 238, 236, 196, 197, 201, 230, 198,
    244, 246, 242, 251, 249, 255, 214, 220, 162, 163, 165, 8359, 402, 225, 237, 243, 250, 241, 209,
    170, 186, 191, 8976, 172, 189, 188, 161, 171, 187, 9617, 9618, 9619, 9474, 9508, 9569, 9570,
    9558, 9557, 9571, 9553, 9559, 9565, 9564, 9563, 9488, 9492, 9524, 9516, 9500, 9472, 9532, 9566,
    9567, 9562, 9556, 9577, 9574, 9568, 9552, 9580, 9575, 9576, 9572, 9573, 9561, 9560, 9554, 9555,
    9579, 9578, 9496, 9484, 9608, 9604, 9612, 9616, 9600, 945, 223, 915, 960, 931, 963, 181, 964,
    934, 920, 937, 948, 8734, 966, 949, 8745, 8801, 177, 8805, 8804, 8992, 8993, 247, 8776, 176,
    8729, 183, 8730, 8319, 178, 9632, 160,
]; // 128 entries

/// Returns the index code point for pointer `code` in this index.
#[inline]
pub fn forward(code: u8) -> u16 {
    FORWARD_TABLE[(code - 0x80) as usize]
}

#[cfg(not(feature = "no-optimized-legacy-encoding"))]
const BACKWARD_TABLE_LOWER: &[u8] = &[
    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,
    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,
    196, 0, 179, 0, 0, 0, 0, 0, 0, 0, 0, 0, 218, 0, 0, 0, 191, 0, 0, 0, 192, 0, 0, 0, 217, 0, 0, 0,
    195, 0, 0, 0, 0, 0, 0, 0, 180, 0, 0, 0, 0, 0, 0, 0, 194, 0, 0, 0, 0, 0, 0, 0, 193, 0, 0, 0, 0,
    0, 0, 0, 197, 0, 0, 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, 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, 158, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    169, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 244, 245, 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, 249, 251, 0, 0, 0, 236, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 239, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 205, 186,
    213, 214, 201, 184, 183, 187, 212, 211, 200, 190, 189, 188, 198, 199, 204, 181, 182, 185, 209,
    210, 203, 207, 208, 202, 216, 215, 206, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 247, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 240, 0, 0, 243,
    242, 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, 226, 0, 0,
    0, 0, 233, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 228, 0, 0, 232, 0, 0, 234, 0, 0, 0, 0, 0, 0, 0, 224,
    0, 0, 235, 238, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 142, 143, 146, 128, 0, 144, 0, 0, 0, 0, 0, 0, 0,
    165, 0, 0, 0, 0, 153, 0, 0, 0, 0, 0, 154, 0, 0, 225, 133, 160, 131, 0, 132, 134, 145, 135, 138,
    130, 136, 137, 141, 161, 140, 139, 0, 164, 149, 162, 147, 0, 148, 246, 0, 151, 163, 150, 129,
    0, 0, 152, 223, 0, 0, 0, 220, 0, 0, 0, 219, 0, 0, 0, 221, 0, 0, 0, 222, 176, 177, 178, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 254, 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, 255, 173, 155, 156, 0, 157, 0, 0, 0, 0, 166, 174, 170, 0, 0,
    0, 248, 241, 253, 0, 0, 230, 0, 250, 0, 0, 167, 175, 172, 171, 0, 168, 227, 0, 0, 229, 231, 0,
    237, 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, 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, 252,
]; // 678 entries

#[cfg(not(feature = "no-optimized-legacy-encoding"))]
const BACKWARD_TABLE_UPPER: &[u16] = &[
    0, 0, 543, 446, 0, 0, 125, 0, 0, 0, 0, 0, 0, 0, 386, 607, 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, 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, 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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 614, 150, 0, 0, 0, 0, 0, 237, 341, 0, 0, 198, 0, 0, 0, 0, 0, 0, 0, 64, 285, 510,
]; // 151 entries

/// Returns the index pointer for code point `code` in this index.
#[inline]
#[cfg(not(feature = "no-optimized-legacy-encoding"))]
pub fn backward(code: u32) -> u8 {
    let offset = (code >> 6) as usize;
    let offset = if offset < 151 {BACKWARD_TABLE_UPPER[offset] as usize} else {0};
    BACKWARD_TABLE_LOWER[offset + ((code & 63) as usize)]
}

/// Returns the index pointer for code point `code` in this index.
#[cfg(feature = "no-optimized-legacy-encoding")]
pub fn backward(code: u32) -> u8 {
    if code > 9632 || ((0x70003u32 >> (code >> 9)) & 1) == 0 { return 0; }
    let code = code as u16;
    for i in 0..0x80 {
        if FORWARD_TABLE[i as usize] == code { return 0x80 + i; }
    }
    0
}

#[cfg(test)]
encoding_index_tests::single_byte_tests! {
}