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

// AUTOGENERATED FROM index-ibm866.txt, ORIGINAL COMMENT FOLLOWS:
//
// Any copyright is dedicated to the Public Domain.
// https://creativecommons.org/publicdomain/zero/1.0/
//
// For details on index index-ibm866.txt see the Encoding Standard
// https://encoding.spec.whatwg.org/
//
// Identifier: db6fe14a559d1601a7667338d83704773d5708dbc641e1ad3c5e21405770f05e
// Date: 2014-12-19

static FORWARD_TABLE: &'static [u16] = &[
    1040, 1041, 1042, 1043, 1044, 1045, 1046, 1047, 1048, 1049, 1050, 1051,
    1052, 1053, 1054, 1055, 1056, 1057, 1058, 1059, 1060, 1061, 1062, 1063,
    1064, 1065, 1066, 1067, 1068, 1069, 1070, 1071, 1072, 1073, 1074, 1075,
    1076, 1077, 1078, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087,
    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,
    1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099,
    1100, 1101, 1102, 1103, 1025, 1105, 1028, 1108, 1031, 1111, 1038, 1118,
    176, 8729, 183, 8730, 8470, 164, 9632, 160,
];

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

static BACKWARD_TABLE_LOWER: &'static [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, 255, 0, 0, 0, 253, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    248, 0, 0, 0, 0, 0, 0, 250, 0, 0, 0, 0, 0, 0, 0, 0, 0, 240, 0, 0, 242, 0,
    0, 244, 0, 0, 0, 0, 0, 0, 246, 0, 128, 129, 130, 131, 132, 133, 134, 135,
    136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150,
    151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165,
    166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 224, 225, 226, 227, 228,
    229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 0, 241, 0, 0, 243,
    0, 0, 245, 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, 252, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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, 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, 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, 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,
];

static BACKWARD_TABLE_UPPER: &'static [u16] = &[
    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, 64, 96, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 160, 0, 0, 0, 0, 0, 0, 0, 192,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 224,
    256, 288, 320, 352, 384,
];

/// Returns the index pointer for code point `code` in this index.
#[inline]
pub fn backward(code: u32) -> u8 {
    let offset = (code >> 5) as usize;
    let offset = if offset < 302 {BACKWARD_TABLE_UPPER[offset] as usize} else {0};
    BACKWARD_TABLE_LOWER[offset + ((code & 31) as usize)]
}

#[cfg(test)]
single_byte_tests!(
    mod = ibm866
);