git.joshuawise.com / firearm.git / blame
| Commit | Line | Data |
|---|---|---|
| 392d1bec JW |
1 | //#test return 151 |
| 2 | ||
| 3 | /* example tree from http://en.wikipedia.org/wiki/Huffman_coding */ | |
| 4 | ||
| 5 | int getbyte(int byte) | |
| 6 | { | |
| 7 | if (byte == 0) return 106; | |
| 8 | if (byte == 1) return 139; | |
| 9 | if (byte == 2) return 120; | |
| 10 | if (byte == 3) return 183; | |
| 11 | if (byte == 4) return 69; | |
| 12 | if (byte == 5) return 197; | |
| 13 | if (byte == 6) return 147; | |
| 14 | if (byte == 7) return 207; | |
| 15 | if (byte == 8) return 35; | |
| 16 | if (byte == 9) return 155; | |
| 17 | if (byte == 10) return 122; | |
| 18 | if (byte == 11) return 244; | |
| 19 | if (byte == 12) return 125; | |
| 20 | if (byte == 13) return 215; | |
| 21 | if (byte == 14) return 69; | |
| 22 | if (byte == 15) return 219; | |
| 23 | if (byte == 16) return 2; | |
| 24 | if (byte == 17) return 224; | |
| 25 | puts("FAIL [abort]: request for byte #"); | |
| 26 | puthex(byte); | |
| 27 | while(1); | |
| 28 | return 0; | |
| 29 | } | |
| 30 | ||
| 31 | int getbit(int bp) | |
| 32 | { | |
| 33 | int byte; | |
| 34 | byte = getbyte(bp/8); | |
| 35 | return (byte >> (7 - (bp % 8))) & 1; | |
| 36 | } | |
| 37 | ||
| 38 | int h(int bitpos) | |
| 39 | { | |
| 40 | if (getbit(bitpos)) | |
| 41 | return h1(bitpos+1); | |
| 42 | else | |
| 43 | return h0(bitpos+1); | |
| 44 | } | |
| 45 | ||
| 46 | int h0(int bitpos) | |
| 47 | { | |
| 48 | if (getbit(bitpos)) | |
| 49 | return h01(bitpos+1); | |
| 50 | else | |
| 51 | return h00(bitpos+1); | |
| 52 | } | |
| 53 | ||
| 54 | int h00(int bitpos) | |
| 55 | { | |
| 56 | if (getbit(bitpos)) | |
| 57 | return h001(bitpos+1); | |
| 58 | else | |
| 59 | return 69+h(bitpos+1); | |
| 60 | } | |
| 61 | ||
| 62 | int h001(int bitpos) | |
| 63 | { | |
| 64 | if (getbit(bitpos)) | |
| 65 | return h0011(bitpos+1); | |
| 66 | else | |
| 67 | return 78+h(bitpos+1); | |
| 68 | } | |
| 69 | ||
| 70 | int h0011(int bitpos) | |
| 71 | { | |
| 72 | if (getbit(bitpos)) | |
| 73 | return 79+h(bitpos+1); | |
| 74 | else | |
| 75 | return 85+h(bitpos+1); | |
| 76 | } | |
| 77 | ||
| 78 | int h01(int bitpos) | |
| 79 | { | |
| 80 | if (getbit(bitpos)) | |
| 81 | return h011(bitpos+1); | |
| 82 | else | |
| 83 | return 65+h(bitpos+1); | |
| 84 | } | |
| 85 | ||
| 86 | int h011(int bitpos) | |
| 87 | { | |
| 88 | if (getbit(bitpos)) | |
| 89 | return 77+h(bitpos+1); | |
| 90 | else | |
| 91 | return 84+h(bitpos+1); | |
| 92 | } | |
| 93 | ||
| 94 | int h1(bitpos) | |
| 95 | { | |
| 96 | if (getbit(bitpos)) | |
| 97 | return h11(bitpos+1); | |
| 98 | else | |
| 99 | return h10(bitpos+1); | |
| 100 | } | |
| 101 | ||
| 102 | int h10(bitpos) | |
| 103 | { | |
| 104 | if (getbit(bitpos)) | |
| 105 | return h101(bitpos+1); | |
| 106 | else | |
| 107 | return h100(bitpos+1); | |
| 108 | } | |
| 109 | ||
| 110 | int h100(bitpos) | |
| 111 | { | |
| 112 | if (getbit(bitpos)) | |
| 113 | return h1001(bitpos+1); | |
| 114 | else | |
| 115 | return 73+h(bitpos+1); | |
| 116 | } | |
| 117 | ||
| 118 | int h1001(bitpos) | |
| 119 | { | |
| 120 | if (getbit(bitpos)) | |
| 121 | return 80+h(bitpos+1); | |
| 122 | else | |
| 123 | return 88+h(bitpos+1); | |
| 124 | } | |
| 125 | ||
| 126 | int h101(bitpos) | |
| 127 | { | |
| 128 | if (getbit(bitpos)) | |
| 129 | return h1011(bitpos+1); | |
| 130 | else | |
| 131 | return 72+h(bitpos+1); | |
| 132 | } | |
| 133 | ||
| 134 | int h1011(bitpos) | |
| 135 | { | |
| 136 | if (getbit(bitpos)) | |
| 137 | return -2169; | |
| 138 | else | |
| 139 | return 83+h(bitpos+1); | |
| 140 | } | |
| 141 | ||
| 142 | int h11(bitpos) | |
| 143 | { | |
| 144 | if (getbit(bitpos)) | |
| 145 | return 32+h(bitpos+1); | |
| 146 | else | |
| 147 | return h110(bitpos+1); | |
| 148 | } | |
| 149 | ||
| 150 | int h110(bitpos) | |
| 151 | { | |
| 152 | if (getbit(bitpos)) | |
| 153 | return 70+h(bitpos+1); | |
| 154 | else | |
| 155 | return h1100(bitpos+1); | |
| 156 | } | |
| 157 | ||
| 158 | int h1100(bitpos) | |
| 159 | { | |
| 160 | if (getbit(bitpos)) | |
| 161 | return 76+h(bitpos+1); | |
| 162 | else | |
| 163 | return 82+h(bitpos+1); | |
| 164 | } | |
| 165 | ||
| 166 | void j4cbo() | |
| 167 | { | |
| 88d7a366 JW |
168 | int x; |
| 169 | if ((x = h(0)) != 151) { | |
| 170 | puthex(x); | |
| 171 | puts(" -> FAIL\n"); | |
| 172 | } else | |
| 173 | puts("PASS\n"); | |
| 392d1bec | 174 | } |