Work on huffman decoding
This commit is contained in:
Carl Lerche
527
src/bin/genhuff.rs
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527
src/bin/genhuff.rs
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@@ -0,0 +1,527 @@
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use std::cell::RefCell;
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struct Node {
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id: Option<usize>,
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left: Option<Box<Node>>,
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right: Option<Box<Node>>,
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terminal: Option<u8>,
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maybe_eos: bool,
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transitions: RefCell<Vec<Transition>>,
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}
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#[derive(Debug, Default, Copy, Clone)]
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struct Transition {
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target: usize,
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byte: Option<u8>,
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maybe_eos: bool,
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}
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const TABLE: &'static str = r##"
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( 0) |11111111|11000 1ff8 [13]
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( 1) |11111111|11111111|1011000 7fffd8 [23]
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( 2) |11111111|11111111|11111110|0010 fffffe2 [28]
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( 3) |11111111|11111111|11111110|0011 fffffe3 [28]
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( 4) |11111111|11111111|11111110|0100 fffffe4 [28]
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( 5) |11111111|11111111|11111110|0101 fffffe5 [28]
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( 6) |11111111|11111111|11111110|0110 fffffe6 [28]
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( 7) |11111111|11111111|11111110|0111 fffffe7 [28]
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( 8) |11111111|11111111|11111110|1000 fffffe8 [28]
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( 9) |11111111|11111111|11101010 ffffea [24]
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( 10) |11111111|11111111|11111111|111100 3ffffffc [30]
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( 11) |11111111|11111111|11111110|1001 fffffe9 [28]
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( 12) |11111111|11111111|11111110|1010 fffffea [28]
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( 13) |11111111|11111111|11111111|111101 3ffffffd [30]
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( 14) |11111111|11111111|11111110|1011 fffffeb [28]
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( 15) |11111111|11111111|11111110|1100 fffffec [28]
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( 16) |11111111|11111111|11111110|1101 fffffed [28]
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( 17) |11111111|11111111|11111110|1110 fffffee [28]
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( 18) |11111111|11111111|11111110|1111 fffffef [28]
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( 19) |11111111|11111111|11111111|0000 ffffff0 [28]
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( 20) |11111111|11111111|11111111|0001 ffffff1 [28]
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( 21) |11111111|11111111|11111111|0010 ffffff2 [28]
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( 22) |11111111|11111111|11111111|111110 3ffffffe [30]
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( 23) |11111111|11111111|11111111|0011 ffffff3 [28]
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( 24) |11111111|11111111|11111111|0100 ffffff4 [28]
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( 25) |11111111|11111111|11111111|0101 ffffff5 [28]
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( 26) |11111111|11111111|11111111|0110 ffffff6 [28]
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( 27) |11111111|11111111|11111111|0111 ffffff7 [28]
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( 28) |11111111|11111111|11111111|1000 ffffff8 [28]
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( 29) |11111111|11111111|11111111|1001 ffffff9 [28]
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( 30) |11111111|11111111|11111111|1010 ffffffa [28]
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( 31) |11111111|11111111|11111111|1011 ffffffb [28]
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' ' ( 32) |010100 14 [ 6]
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'!' ( 33) |11111110|00 3f8 [10]
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'"' ( 34) |11111110|01 3f9 [10]
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'#' ( 35) |11111111|1010 ffa [12]
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'$' ( 36) |11111111|11001 1ff9 [13]
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'%' ( 37) |010101 15 [ 6]
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'&' ( 38) |11111000 f8 [ 8]
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''' ( 39) |11111111|010 7fa [11]
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'(' ( 40) |11111110|10 3fa [10]
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')' ( 41) |11111110|11 3fb [10]
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'*' ( 42) |11111001 f9 [ 8]
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'+' ( 43) |11111111|011 7fb [11]
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',' ( 44) |11111010 fa [ 8]
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'-' ( 45) |010110 16 [ 6]
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'.' ( 46) |010111 17 [ 6]
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'/' ( 47) |011000 18 [ 6]
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'0' ( 48) |00000 0 [ 5]
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'1' ( 49) |00001 1 [ 5]
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'2' ( 50) |00010 2 [ 5]
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'3' ( 51) |011001 19 [ 6]
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'4' ( 52) |011010 1a [ 6]
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'5' ( 53) |011011 1b [ 6]
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'6' ( 54) |011100 1c [ 6]
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'7' ( 55) |011101 1d [ 6]
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'8' ( 56) |011110 1e [ 6]
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'9' ( 57) |011111 1f [ 6]
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':' ( 58) |1011100 5c [ 7]
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';' ( 59) |11111011 fb [ 8]
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'<' ( 60) |11111111|1111100 7ffc [15]
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'=' ( 61) |100000 20 [ 6]
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'>' ( 62) |11111111|1011 ffb [12]
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'?' ( 63) |11111111|00 3fc [10]
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'@' ( 64) |11111111|11010 1ffa [13]
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'A' ( 65) |100001 21 [ 6]
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'B' ( 66) |1011101 5d [ 7]
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'C' ( 67) |1011110 5e [ 7]
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'D' ( 68) |1011111 5f [ 7]
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'E' ( 69) |1100000 60 [ 7]
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'F' ( 70) |1100001 61 [ 7]
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'G' ( 71) |1100010 62 [ 7]
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'H' ( 72) |1100011 63 [ 7]
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'I' ( 73) |1100100 64 [ 7]
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'J' ( 74) |1100101 65 [ 7]
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'K' ( 75) |1100110 66 [ 7]
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'L' ( 76) |1100111 67 [ 7]
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'M' ( 77) |1101000 68 [ 7]
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'N' ( 78) |1101001 69 [ 7]
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'O' ( 79) |1101010 6a [ 7]
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'P' ( 80) |1101011 6b [ 7]
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'Q' ( 81) |1101100 6c [ 7]
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'R' ( 82) |1101101 6d [ 7]
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'S' ( 83) |1101110 6e [ 7]
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'T' ( 84) |1101111 6f [ 7]
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'U' ( 85) |1110000 70 [ 7]
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'V' ( 86) |1110001 71 [ 7]
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'W' ( 87) |1110010 72 [ 7]
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'X' ( 88) |11111100 fc [ 8]
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'Y' ( 89) |1110011 73 [ 7]
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'Z' ( 90) |11111101 fd [ 8]
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'[' ( 91) |11111111|11011 1ffb [13]
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'\' ( 92) |11111111|11111110|000 7fff0 [19]
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']' ( 93) |11111111|11100 1ffc [13]
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'^' ( 94) |11111111|111100 3ffc [14]
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'_' ( 95) |100010 22 [ 6]
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'`' ( 96) |11111111|1111101 7ffd [15]
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'a' ( 97) |00011 3 [ 5]
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'b' ( 98) |100011 23 [ 6]
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'c' ( 99) |00100 4 [ 5]
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'd' (100) |100100 24 [ 6]
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'e' (101) |00101 5 [ 5]
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'f' (102) |100101 25 [ 6]
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'g' (103) |100110 26 [ 6]
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'h' (104) |100111 27 [ 6]
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'i' (105) |00110 6 [ 5]
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'j' (106) |1110100 74 [ 7]
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'k' (107) |1110101 75 [ 7]
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'l' (108) |101000 28 [ 6]
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'm' (109) |101001 29 [ 6]
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'n' (110) |101010 2a [ 6]
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'o' (111) |00111 7 [ 5]
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'p' (112) |101011 2b [ 6]
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'q' (113) |1110110 76 [ 7]
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'r' (114) |101100 2c [ 6]
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's' (115) |01000 8 [ 5]
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't' (116) |01001 9 [ 5]
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'u' (117) |101101 2d [ 6]
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'v' (118) |1110111 77 [ 7]
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'w' (119) |1111000 78 [ 7]
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'x' (120) |1111001 79 [ 7]
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'y' (121) |1111010 7a [ 7]
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'z' (122) |1111011 7b [ 7]
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'{' (123) |11111111|1111110 7ffe [15]
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'|' (124) |11111111|100 7fc [11]
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'}' (125) |11111111|111101 3ffd [14]
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'~' (126) |11111111|11101 1ffd [13]
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(127) |11111111|11111111|11111111|1100 ffffffc [28]
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(128) |11111111|11111110|0110 fffe6 [20]
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(129) |11111111|11111111|010010 3fffd2 [22]
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(130) |11111111|11111110|0111 fffe7 [20]
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(131) |11111111|11111110|1000 fffe8 [20]
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(132) |11111111|11111111|010011 3fffd3 [22]
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(133) |11111111|11111111|010100 3fffd4 [22]
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(134) |11111111|11111111|010101 3fffd5 [22]
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(135) |11111111|11111111|1011001 7fffd9 [23]
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(136) |11111111|11111111|010110 3fffd6 [22]
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(137) |11111111|11111111|1011010 7fffda [23]
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(138) |11111111|11111111|1011011 7fffdb [23]
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(139) |11111111|11111111|1011100 7fffdc [23]
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(140) |11111111|11111111|1011101 7fffdd [23]
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(141) |11111111|11111111|1011110 7fffde [23]
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(142) |11111111|11111111|11101011 ffffeb [24]
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(143) |11111111|11111111|1011111 7fffdf [23]
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(144) |11111111|11111111|11101100 ffffec [24]
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(145) |11111111|11111111|11101101 ffffed [24]
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(146) |11111111|11111111|010111 3fffd7 [22]
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(147) |11111111|11111111|1100000 7fffe0 [23]
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(148) |11111111|11111111|11101110 ffffee [24]
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(149) |11111111|11111111|1100001 7fffe1 [23]
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(150) |11111111|11111111|1100010 7fffe2 [23]
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(151) |11111111|11111111|1100011 7fffe3 [23]
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(152) |11111111|11111111|1100100 7fffe4 [23]
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(153) |11111111|11111110|11100 1fffdc [21]
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(154) |11111111|11111111|011000 3fffd8 [22]
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(155) |11111111|11111111|1100101 7fffe5 [23]
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(156) |11111111|11111111|011001 3fffd9 [22]
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(157) |11111111|11111111|1100110 7fffe6 [23]
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(158) |11111111|11111111|1100111 7fffe7 [23]
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(159) |11111111|11111111|11101111 ffffef [24]
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(160) |11111111|11111111|011010 3fffda [22]
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(161) |11111111|11111110|11101 1fffdd [21]
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(162) |11111111|11111110|1001 fffe9 [20]
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(163) |11111111|11111111|011011 3fffdb [22]
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(164) |11111111|11111111|011100 3fffdc [22]
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(165) |11111111|11111111|1101000 7fffe8 [23]
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(166) |11111111|11111111|1101001 7fffe9 [23]
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(167) |11111111|11111110|11110 1fffde [21]
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(168) |11111111|11111111|1101010 7fffea [23]
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(169) |11111111|11111111|011101 3fffdd [22]
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(170) |11111111|11111111|011110 3fffde [22]
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(171) |11111111|11111111|11110000 fffff0 [24]
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(172) |11111111|11111110|11111 1fffdf [21]
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(173) |11111111|11111111|011111 3fffdf [22]
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(174) |11111111|11111111|1101011 7fffeb [23]
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(175) |11111111|11111111|1101100 7fffec [23]
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(176) |11111111|11111111|00000 1fffe0 [21]
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(177) |11111111|11111111|00001 1fffe1 [21]
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(178) |11111111|11111111|100000 3fffe0 [22]
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(179) |11111111|11111111|00010 1fffe2 [21]
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(180) |11111111|11111111|1101101 7fffed [23]
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(181) |11111111|11111111|100001 3fffe1 [22]
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(182) |11111111|11111111|1101110 7fffee [23]
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(183) |11111111|11111111|1101111 7fffef [23]
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(184) |11111111|11111110|1010 fffea [20]
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(185) |11111111|11111111|100010 3fffe2 [22]
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(186) |11111111|11111111|100011 3fffe3 [22]
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(187) |11111111|11111111|100100 3fffe4 [22]
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(188) |11111111|11111111|1110000 7ffff0 [23]
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(189) |11111111|11111111|100101 3fffe5 [22]
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(190) |11111111|11111111|100110 3fffe6 [22]
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(191) |11111111|11111111|1110001 7ffff1 [23]
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(192) |11111111|11111111|11111000|00 3ffffe0 [26]
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(193) |11111111|11111111|11111000|01 3ffffe1 [26]
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(194) |11111111|11111110|1011 fffeb [20]
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(195) |11111111|11111110|001 7fff1 [19]
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(196) |11111111|11111111|100111 3fffe7 [22]
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(197) |11111111|11111111|1110010 7ffff2 [23]
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(198) |11111111|11111111|101000 3fffe8 [22]
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(199) |11111111|11111111|11110110|0 1ffffec [25]
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(200) |11111111|11111111|11111000|10 3ffffe2 [26]
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(201) |11111111|11111111|11111000|11 3ffffe3 [26]
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(202) |11111111|11111111|11111001|00 3ffffe4 [26]
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(203) |11111111|11111111|11111011|110 7ffffde [27]
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(204) |11111111|11111111|11111011|111 7ffffdf [27]
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(205) |11111111|11111111|11111001|01 3ffffe5 [26]
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(206) |11111111|11111111|11110001 fffff1 [24]
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(207) |11111111|11111111|11110110|1 1ffffed [25]
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(208) |11111111|11111110|010 7fff2 [19]
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(209) |11111111|11111111|00011 1fffe3 [21]
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(210) |11111111|11111111|11111001|10 3ffffe6 [26]
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(211) |11111111|11111111|11111100|000 7ffffe0 [27]
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(212) |11111111|11111111|11111100|001 7ffffe1 [27]
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(213) |11111111|11111111|11111001|11 3ffffe7 [26]
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(214) |11111111|11111111|11111100|010 7ffffe2 [27]
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(215) |11111111|11111111|11110010 fffff2 [24]
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(216) |11111111|11111111|00100 1fffe4 [21]
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(217) |11111111|11111111|00101 1fffe5 [21]
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(218) |11111111|11111111|11111010|00 3ffffe8 [26]
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(219) |11111111|11111111|11111010|01 3ffffe9 [26]
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(220) |11111111|11111111|11111111|1101 ffffffd [28]
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(221) |11111111|11111111|11111100|011 7ffffe3 [27]
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(222) |11111111|11111111|11111100|100 7ffffe4 [27]
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(223) |11111111|11111111|11111100|101 7ffffe5 [27]
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(224) |11111111|11111110|1100 fffec [20]
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(225) |11111111|11111111|11110011 fffff3 [24]
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(226) |11111111|11111110|1101 fffed [20]
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(227) |11111111|11111111|00110 1fffe6 [21]
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(228) |11111111|11111111|101001 3fffe9 [22]
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(229) |11111111|11111111|00111 1fffe7 [21]
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(230) |11111111|11111111|01000 1fffe8 [21]
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(231) |11111111|11111111|1110011 7ffff3 [23]
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(232) |11111111|11111111|101010 3fffea [22]
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(233) |11111111|11111111|101011 3fffeb [22]
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(234) |11111111|11111111|11110111|0 1ffffee [25]
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(235) |11111111|11111111|11110111|1 1ffffef [25]
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(236) |11111111|11111111|11110100 fffff4 [24]
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(237) |11111111|11111111|11110101 fffff5 [24]
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(238) |11111111|11111111|11111010|10 3ffffea [26]
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(239) |11111111|11111111|1110100 7ffff4 [23]
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(240) |11111111|11111111|11111010|11 3ffffeb [26]
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(241) |11111111|11111111|11111100|110 7ffffe6 [27]
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(242) |11111111|11111111|11111011|00 3ffffec [26]
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(243) |11111111|11111111|11111011|01 3ffffed [26]
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(244) |11111111|11111111|11111100|111 7ffffe7 [27]
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(245) |11111111|11111111|11111101|000 7ffffe8 [27]
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(246) |11111111|11111111|11111101|001 7ffffe9 [27]
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(247) |11111111|11111111|11111101|010 7ffffea [27]
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(248) |11111111|11111111|11111101|011 7ffffeb [27]
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(249) |11111111|11111111|11111111|1110 ffffffe [28]
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(250) |11111111|11111111|11111101|100 7ffffec [27]
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(251) |11111111|11111111|11111101|101 7ffffed [27]
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(252) |11111111|11111111|11111101|110 7ffffee [27]
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(253) |11111111|11111111|11111101|111 7ffffef [27]
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(254) |11111111|11111111|11111110|000 7fffff0 [27]
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(255) |11111111|11111111|11111011|10 3ffffee [26]
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EOS (256) |11111111|11111111|11111111|111111 3fffffff [30]"##;
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const VALID_NAME_CHAR: &'static [u8] = &[
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 0-31
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0,1,0,1,1,1,1,1,0,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0, // 32-63
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1, // 64-95
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,0,1,0, // 96-127
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 128-159
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 160-191
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 192-223
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 224-255
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];
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const VALID_VALUE_CHAR: &'static [u8] = &[
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0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 0-31
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // 32-63
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // 64-95
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0, // 96-127
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // 128-159
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // 160-191
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // 192-223
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // 224-255
|
||||
];
|
||||
|
||||
impl Node {
|
||||
fn new(byte: u8, code: &[bool]) -> Box<Node> {
|
||||
let mut node = Box::new(Node {
|
||||
id: None,
|
||||
left: None,
|
||||
right: None,
|
||||
terminal: None,
|
||||
maybe_eos: false,
|
||||
transitions: Default::default(),
|
||||
});
|
||||
|
||||
node.insert(byte, code);
|
||||
node
|
||||
}
|
||||
|
||||
fn insert(&mut self, byte: u8, code: &[bool]) {
|
||||
if code.is_empty() {
|
||||
self.terminal = Some(byte);
|
||||
return;
|
||||
}
|
||||
|
||||
let (head, rest) = code.split_at(1);
|
||||
|
||||
if !head[0] {
|
||||
match self.left {
|
||||
Some(ref mut node) => {
|
||||
node.insert(byte, rest);
|
||||
}
|
||||
None => {
|
||||
self.left = Some(Node::new(byte, rest));
|
||||
}
|
||||
}
|
||||
} else {
|
||||
match self.right {
|
||||
Some(ref mut node) => {
|
||||
node.insert(byte, rest);
|
||||
}
|
||||
None => {
|
||||
self.right = Some(Node::new(byte, rest));
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn set_id(&mut self, next_id: &mut usize, prefix: &mut Vec<bool>) {
|
||||
if self.terminal.is_some() {
|
||||
return;
|
||||
}
|
||||
|
||||
if prefix.len() <= 7 && prefix.iter().all(|i| *i) {
|
||||
self.maybe_eos = true;
|
||||
}
|
||||
|
||||
let id = *next_id;
|
||||
*next_id = id + 1;
|
||||
self.id = Some(id);
|
||||
|
||||
if let Some(ref mut node) = self.left {
|
||||
prefix.push(false);
|
||||
node.set_id(next_id, prefix);
|
||||
prefix.pop();
|
||||
}
|
||||
|
||||
if let Some(ref mut node) = self.right {
|
||||
prefix.push(true);
|
||||
node.set_id(next_id, prefix);
|
||||
prefix.pop();
|
||||
}
|
||||
}
|
||||
|
||||
fn compute_transitions(&self, root: &Node) {
|
||||
self.compute_transition(None, self, root, 4);
|
||||
|
||||
if let Some(ref node) = self.left {
|
||||
node.compute_transitions(root);
|
||||
}
|
||||
|
||||
if let Some(ref node) = self.right {
|
||||
node.compute_transitions(root);
|
||||
}
|
||||
}
|
||||
|
||||
fn compute_transition(&self,
|
||||
byte: Option<u8>,
|
||||
start: &Node,
|
||||
root: &Node,
|
||||
steps_remaining: usize)
|
||||
{
|
||||
let mut next = self;
|
||||
|
||||
if self.terminal.is_some() {
|
||||
next = root;
|
||||
}
|
||||
|
||||
if steps_remaining == 0 {
|
||||
start.transitions.borrow_mut().push(Transition {
|
||||
target: next.id.unwrap(),
|
||||
byte: byte,
|
||||
maybe_eos: next.maybe_eos,
|
||||
});
|
||||
return;
|
||||
}
|
||||
|
||||
assert!(next.left.is_some());
|
||||
assert!(next.right.is_some());
|
||||
|
||||
for node in &[next.left.as_ref().unwrap(), next.right.as_ref().unwrap()] {
|
||||
let byte = match node.terminal {
|
||||
Some(b) => {
|
||||
assert!(byte.is_none());
|
||||
Some(b)
|
||||
}
|
||||
None => byte,
|
||||
};
|
||||
|
||||
node.compute_transition(byte, start, root, steps_remaining - 1);
|
||||
}
|
||||
}
|
||||
|
||||
fn print(&self) {
|
||||
const NGHTTP2_HUFF_ACCEPTED: usize = 1;
|
||||
const NGHTTP2_HUFF_SYM: usize = 1 << 1;
|
||||
const NGHTTP2_HUFF_FAIL: usize = 1 << 2;
|
||||
const NGHTTP2_HUFF_INVALID_FOR_HEADER_NAME: usize = 1 << 3;
|
||||
const NGHTTP2_HUFF_INVALID_FOR_HEADER_VALUE: usize = 1 << 4;
|
||||
const NGHTTP2_HUFF_UPPER_CASE_CHAR: usize = 1 << 5;
|
||||
|
||||
if self.terminal.is_some() {
|
||||
return;
|
||||
}
|
||||
|
||||
println!(" // {}", self.id.unwrap());
|
||||
println!(" [");
|
||||
|
||||
for transition in self.transitions.borrow().iter() {
|
||||
let mut flags = 0;
|
||||
let mut out = 0;
|
||||
let mut target = transition.target;
|
||||
|
||||
if let Some(byte) = transition.byte {
|
||||
out = byte;
|
||||
flags |= NGHTTP2_HUFF_SYM;
|
||||
|
||||
if VALID_NAME_CHAR[byte as usize] == 0 {
|
||||
flags |= NGHTTP2_HUFF_INVALID_FOR_HEADER_NAME;
|
||||
}
|
||||
|
||||
if VALID_VALUE_CHAR[byte as usize] == 0 {
|
||||
flags |= NGHTTP2_HUFF_INVALID_FOR_HEADER_VALUE;
|
||||
}
|
||||
|
||||
// TODO: Add other flags
|
||||
}
|
||||
|
||||
if transition.maybe_eos {
|
||||
flags |= NGHTTP2_HUFF_ACCEPTED;
|
||||
}
|
||||
|
||||
println!(" HuffmanState {{");
|
||||
println!(" next: {},", target);
|
||||
println!(" byte: {},", out);
|
||||
println!(" flags: {},", flags);
|
||||
println!(" }},");
|
||||
}
|
||||
|
||||
println!(" ],");
|
||||
|
||||
self.left.as_ref().unwrap().print();
|
||||
self.right.as_ref().unwrap().print();
|
||||
}
|
||||
}
|
||||
|
||||
/// Returns root of tree
|
||||
fn load_table() -> Box<Node> {
|
||||
let mut lines = TABLE.lines();
|
||||
let mut root: Option<Box<Node>> = None;
|
||||
|
||||
// Skip the first line, which is empty
|
||||
lines.next();
|
||||
|
||||
for (i, line) in lines.enumerate() {
|
||||
let mut bits: Vec<bool> = vec![];
|
||||
|
||||
for &b in &line.as_bytes()[12..45] {
|
||||
match b {
|
||||
b'1' => bits.push(true),
|
||||
b'0' => bits.push(false),
|
||||
b'|' | b' ' => {}
|
||||
_ => panic!("unexpected byte; {:?}", b),
|
||||
}
|
||||
}
|
||||
|
||||
match root {
|
||||
Some(ref mut node) => {
|
||||
node.insert(i as u8, &bits);
|
||||
}
|
||||
None => {
|
||||
root = Some(Node::new(i as u8, &bits));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Assign IDs to all state transition nodes
|
||||
let mut root = root.unwrap();
|
||||
let mut id = 0;
|
||||
root.set_id(&mut id, &mut vec![]);
|
||||
|
||||
// Compute transitions for each node
|
||||
root.compute_transitions(&root);
|
||||
|
||||
root
|
||||
}
|
||||
|
||||
pub fn main() {
|
||||
let table = load_table();
|
||||
|
||||
println!("// !!! DO NOT EDIT !!! Generated by src/bin/genhuff.rs");
|
||||
println!("");
|
||||
|
||||
println!(r##"use super::huffman::HuffmanState;"##);
|
||||
println!("");
|
||||
|
||||
println!("const HUFFMAN_DECODE_TABLE: [[HuffmanState; 16]; 256] = [");
|
||||
|
||||
table.print();
|
||||
|
||||
println!("];");
|
||||
}
|
||||
@@ -1,6 +1,6 @@
|
||||
use super::Entry;
|
||||
|
||||
use tower::http::{HeaderName, Str};
|
||||
use tower::http::{HeaderName, StatusCode, Method, Str};
|
||||
use bytes::{Buf, Bytes};
|
||||
|
||||
use std::io::Cursor;
|
||||
@@ -19,6 +19,7 @@ pub struct Decoder {
|
||||
pub enum DecoderError {
|
||||
InvalidRepresentation,
|
||||
InvalidIntegerPrefix,
|
||||
InvalidTableIndex,
|
||||
IntegerUnderflow,
|
||||
IntegerOverflow,
|
||||
}
|
||||
@@ -133,7 +134,7 @@ impl Decoder {
|
||||
|
||||
/// Decodes the headers found in the given buffer.
|
||||
pub fn decode<F>(&mut self, src: &Bytes, mut f: F) -> Result<(), DecoderError>
|
||||
where F: FnMut(HeaderName, Str)
|
||||
where F: FnMut(Entry)
|
||||
{
|
||||
use self::Representation::*;
|
||||
|
||||
@@ -145,7 +146,7 @@ impl Decoder {
|
||||
// determined from the first byte.
|
||||
match try!(Representation::load(peek_u8(&mut buf))) {
|
||||
Indexed => {
|
||||
unimplemented!();
|
||||
f(try!(self.decode_indexed(&mut buf)));
|
||||
}
|
||||
LiteralWithIndexing => {
|
||||
unimplemented!();
|
||||
@@ -167,12 +168,20 @@ impl Decoder {
|
||||
|
||||
fn decode_indexed(&self, buf: &mut Cursor<&Bytes>) -> Result<Entry, DecoderError> {
|
||||
let index = try!(decode_int(buf, 7));
|
||||
self.get_from_table(index)
|
||||
self.table.get(index)
|
||||
}
|
||||
|
||||
fn get_from_table(&self, index: usize) -> Result<Entry, DecoderError> {
|
||||
fn decode_literal(&self, buf: &mut Cursor<&Bytes>, index: bool) -> Result<Entry, DecoderError> {
|
||||
let prefix = if index {
|
||||
6
|
||||
} else {
|
||||
4
|
||||
};
|
||||
|
||||
// Extract the table index for the name, or 0 if not indexed
|
||||
let table_idx = try!(decode_int(buf, prefix));
|
||||
|
||||
unimplemented!();
|
||||
// self.header_table.get(index).o
|
||||
}
|
||||
}
|
||||
|
||||
@@ -280,21 +289,261 @@ impl Table {
|
||||
self.max_size
|
||||
}
|
||||
|
||||
|
||||
/// Returns the entry located at the given index.
|
||||
///
|
||||
/// The table is 1-indexed and constructed in such a way that the first
|
||||
/// entries belong to the static table, followed by entries in the dynamic
|
||||
/// table. They are merged into a single index address space, though.
|
||||
///
|
||||
/// This is according to the [HPACK spec, section 2.3.3.]
|
||||
/// (http://http2.github.io/http2-spec/compression.html#index.address.space)
|
||||
pub fn get(&self, index: usize) -> Result<Entry, DecoderError> {
|
||||
if index == 0 {
|
||||
return Err(DecoderError::InvalidTableIndex);
|
||||
}
|
||||
|
||||
if index <= 61 {
|
||||
return Ok(get_static(index));
|
||||
}
|
||||
|
||||
// Convert the index for lookup in the entries structure.
|
||||
match self.entries.get(index - 62) {
|
||||
Some(e) => Ok(e.clone()),
|
||||
None => Err(DecoderError::InvalidTableIndex),
|
||||
}
|
||||
}
|
||||
|
||||
fn insert(&mut self, entry: Entry) {
|
||||
let len = entry.len();
|
||||
|
||||
debug_assert!(len <= self.max_size);
|
||||
|
||||
while self.size + len > self.max_size {
|
||||
let last = self.entries.pop_back()
|
||||
.expect("size of table != 0, but no headers left!");
|
||||
|
||||
self.size -= last.len();
|
||||
}
|
||||
self.reserve(len);
|
||||
|
||||
self.size += len;
|
||||
|
||||
// Track the entry
|
||||
self.entries.push_front(entry);
|
||||
}
|
||||
|
||||
fn reserve(&mut self, size: usize) {
|
||||
debug_assert!(size <= self.max_size);
|
||||
|
||||
while self.size + size > self.max_size {
|
||||
let last = self.entries.pop_back()
|
||||
.expect("size of table != 0, but no headers left!");
|
||||
|
||||
self.size -= last.len();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Get an entry from the static table
|
||||
pub fn get_static(idx: usize) -> Entry {
|
||||
use tower::http::StandardHeader::*;
|
||||
|
||||
match idx {
|
||||
1 => Entry::Authority(Str::new()),
|
||||
2 => Entry::Method(Method::Get),
|
||||
3 => Entry::Method(Method::Post),
|
||||
4 => Entry::Path(Str::from_static("/")),
|
||||
5 => Entry::Path(Str::from_static("/index.html")),
|
||||
6 => Entry::Scheme(Str::from_static("http")),
|
||||
7 => Entry::Scheme(Str::from_static("https")),
|
||||
8 => Entry::Status(StatusCode::Ok),
|
||||
9 => Entry::Status(StatusCode::NoContent),
|
||||
10 => Entry::Status(StatusCode::PartialContent),
|
||||
11 => Entry::Status(StatusCode::NotModified),
|
||||
12 => Entry::Status(StatusCode::BadRequest),
|
||||
13 => Entry::Status(StatusCode::NotFound),
|
||||
14 => Entry::Status(StatusCode::InternalServerError),
|
||||
15 => Entry::Header {
|
||||
name: AcceptCharset.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
16 => Entry::Header {
|
||||
name: AcceptEncoding.into(),
|
||||
value: Str::from_static("gzip, deflate"),
|
||||
},
|
||||
17 => Entry::Header {
|
||||
name: AcceptLanguage.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
18 => Entry::Header {
|
||||
name: AcceptRanges.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
19 => Entry::Header {
|
||||
name: Accept.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
20 => Entry::Header {
|
||||
name: AccessControlAllowOrigin.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
21 => Entry::Header {
|
||||
name: Age.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
22 => Entry::Header {
|
||||
name: Allow.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
23 => Entry::Header {
|
||||
name: Authorization.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
24 => Entry::Header {
|
||||
name: CacheControl.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
25 => Entry::Header {
|
||||
name: ContentDisposition.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
26 => Entry::Header {
|
||||
name: ContentEncoding.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
27 => Entry::Header {
|
||||
name: ContentLanguage.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
28 => Entry::Header {
|
||||
name: ContentLength.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
29 => Entry::Header {
|
||||
name: ContentLocation.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
30 => Entry::Header {
|
||||
name: ContentRange.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
31 => Entry::Header {
|
||||
name: ContentType.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
32 => Entry::Header {
|
||||
name: Cookie.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
33 => Entry::Header {
|
||||
name: Date.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
34 => Entry::Header {
|
||||
name: Etag.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
35 => Entry::Header {
|
||||
name: Expect.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
36 => Entry::Header {
|
||||
name: Expires.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
37 => Entry::Header {
|
||||
name: From.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
38 => Entry::Header {
|
||||
name: Host.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
39 => Entry::Header {
|
||||
name: IfMatch.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
40 => Entry::Header {
|
||||
name: IfModifiedSince.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
41 => Entry::Header {
|
||||
name: IfNoneMatch.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
42 => Entry::Header {
|
||||
name: IfRange.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
43 => Entry::Header {
|
||||
name: IfUnmodifiedSince.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
44 => Entry::Header {
|
||||
name: LastModified.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
45 => Entry::Header {
|
||||
name: Link.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
46 => Entry::Header {
|
||||
name: Location.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
47 => Entry::Header {
|
||||
name: MaxForwards.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
48 => Entry::Header {
|
||||
name: ProxyAuthenticate.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
49 => Entry::Header {
|
||||
name: ProxyAuthorization.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
50 => Entry::Header {
|
||||
name: Range.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
51 => Entry::Header {
|
||||
name: Referer.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
52 => Entry::Header {
|
||||
name: Refresh.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
53 => Entry::Header {
|
||||
name: RetryAfter.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
54 => Entry::Header {
|
||||
name: Server.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
55 => Entry::Header {
|
||||
name: SetCookie.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
56 => Entry::Header {
|
||||
name: StrictTransportSecurity.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
57 => Entry::Header {
|
||||
name: TransferEncoding.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
58 => Entry::Header {
|
||||
name: UserAgent.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
59 => Entry::Header {
|
||||
name: Vary.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
60 => Entry::Header {
|
||||
name: Via.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
61 => Entry::Header {
|
||||
name: WwwAuthenticate.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,6 +1,7 @@
|
||||
use tower::http::{HeaderName, Method, StatusCode, Str};
|
||||
|
||||
/// HPack table entry
|
||||
#[derive(Debug, Clone)]
|
||||
pub enum Entry {
|
||||
Header {
|
||||
name: HeaderName,
|
||||
|
||||
5
src/hpack/huffman.rs
Normal file
5
src/hpack/huffman.rs
Normal file
@@ -0,0 +1,5 @@
|
||||
pub struct HuffmanState {
|
||||
pub next: usize,
|
||||
pub byte: u8,
|
||||
pub flags: u8,
|
||||
}
|
||||
21254
src/hpack/huffman_table.rs
Normal file
21254
src/hpack/huffman_table.rs
Normal file
File diff suppressed because it is too large
Load Diff
@@ -1,6 +1,8 @@
|
||||
mod encoder;
|
||||
mod decoder;
|
||||
mod entry;
|
||||
mod huffman;
|
||||
mod huffman_table;
|
||||
// mod table;
|
||||
|
||||
pub use self::encoder::Encoder;
|
||||
|
||||
@@ -3,216 +3,7 @@ use hpack::Entry;
|
||||
use tower::http::{HeaderName, StatusCode, Method, Str};
|
||||
use std::collections::VecDeque;
|
||||
|
||||
/// Get an entry from the static table
|
||||
pub fn get_static(idx: usize) -> Entry {
|
||||
use tower::http::StandardHeader::*;
|
||||
|
||||
match idx {
|
||||
1 => Entry::Authority(Str::new()),
|
||||
2 => Entry::Method(Method::Get),
|
||||
3 => Entry::Method(Method::Post),
|
||||
4 => Entry::Path(Str::from_static("/")),
|
||||
5 => Entry::Path(Str::from_static("/index.html")),
|
||||
6 => Entry::Scheme(Str::from_static("http")),
|
||||
7 => Entry::Scheme(Str::from_static("https")),
|
||||
8 => Entry::Status(StatusCode::Ok),
|
||||
9 => Entry::Status(StatusCode::NoContent),
|
||||
10 => Entry::Status(StatusCode::PartialContent),
|
||||
11 => Entry::Status(StatusCode::NotModified),
|
||||
12 => Entry::Status(StatusCode::BadRequest),
|
||||
13 => Entry::Status(StatusCode::NotFound),
|
||||
14 => Entry::Status(StatusCode::InternalServerError),
|
||||
15 => Entry::Header {
|
||||
name: AcceptCharset.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
16 => Entry::Header {
|
||||
name: AcceptEncoding.into(),
|
||||
value: Str::from_static("gzip, deflate"),
|
||||
},
|
||||
17 => Entry::Header {
|
||||
name: AcceptLanguage.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
18 => Entry::Header {
|
||||
name: AcceptRanges.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
19 => Entry::Header {
|
||||
name: Accept.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
20 => Entry::Header {
|
||||
name: AccessControlAllowOrigin.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
21 => Entry::Header {
|
||||
name: Age.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
22 => Entry::Header {
|
||||
name: Allow.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
23 => Entry::Header {
|
||||
name: Authorization.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
24 => Entry::Header {
|
||||
name: CacheControl.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
25 => Entry::Header {
|
||||
name: ContentDisposition.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
26 => Entry::Header {
|
||||
name: ContentEncoding.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
27 => Entry::Header {
|
||||
name: ContentLanguage.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
28 => Entry::Header {
|
||||
name: ContentLength.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
29 => Entry::Header {
|
||||
name: ContentLocation.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
30 => Entry::Header {
|
||||
name: ContentRange.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
31 => Entry::Header {
|
||||
name: ContentType.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
32 => Entry::Header {
|
||||
name: Cookie.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
33 => Entry::Header {
|
||||
name: Date.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
34 => Entry::Header {
|
||||
name: Etag.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
35 => Entry::Header {
|
||||
name: Expect.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
36 => Entry::Header {
|
||||
name: Expires.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
37 => Entry::Header {
|
||||
name: From.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
38 => Entry::Header {
|
||||
name: Host.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
39 => Entry::Header {
|
||||
name: IfMatch.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
40 => Entry::Header {
|
||||
name: IfModifiedSince.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
41 => Entry::Header {
|
||||
name: IfNoneMatch.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
42 => Entry::Header {
|
||||
name: IfRange.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
43 => Entry::Header {
|
||||
name: IfUnmodifiedSince.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
44 => Entry::Header {
|
||||
name: LastModified.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
45 => Entry::Header {
|
||||
name: Link.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
46 => Entry::Header {
|
||||
name: Location.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
47 => Entry::Header {
|
||||
name: MaxForwards.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
48 => Entry::Header {
|
||||
name: ProxyAuthenticate.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
49 => Entry::Header {
|
||||
name: ProxyAuthorization.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
50 => Entry::Header {
|
||||
name: Range.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
51 => Entry::Header {
|
||||
name: Referer.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
52 => Entry::Header {
|
||||
name: Refresh.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
53 => Entry::Header {
|
||||
name: RetryAfter.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
54 => Entry::Header {
|
||||
name: Server.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
55 => Entry::Header {
|
||||
name: SetCookie.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
56 => Entry::Header {
|
||||
name: StrictTransportSecurity.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
57 => Entry::Header {
|
||||
name: TransferEncoding.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
58 => Entry::Header {
|
||||
name: UserAgent.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
59 => Entry::Header {
|
||||
name: Vary.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
60 => Entry::Header {
|
||||
name: Via.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
61 => Entry::Header {
|
||||
name: WwwAuthenticate.into(),
|
||||
value: Str::new(),
|
||||
},
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
pub struct Table {
|
||||
|
||||
Reference in New Issue
Block a user