| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| const char *set[] = { |
| "GET ", |
| "Host:", |
| "Connection:", |
| "Sec-WebSocket-Key1:", |
| "Sec-WebSocket-Key2:", |
| "Sec-WebSocket-Protocol:", |
| "Upgrade:", |
| "Origin:", |
| "Sec-WebSocket-Draft:", |
| "\x0d\x0a", |
| |
| "Sec-WebSocket-Key:", |
| "Sec-WebSocket-Version:", |
| "Sec-WebSocket-Origin:", |
| |
| "Sec-WebSocket-Extensions:", |
| |
| "Sec-WebSocket-Accept:", |
| "Sec-WebSocket-Nonce:", |
| "HTTP/1.1 ", |
| }; |
| |
| unsigned char lextable[] = { |
| /* pos 0: state 0 */ |
| 0x47 /* 'G' */, 0x07 /* to pos 14 state 1 */, |
| 0x48 /* 'H' */, 0x0A /* to pos 22 state 5 */, |
| 0x43 /* 'C' */, 0x0F /* to pos 34 state 10 */, |
| 0x53 /* 'S' */, 0x19 /* to pos 56 state 21 */, |
| 0x55 /* 'U' */, 0x3F /* to pos 134 state 51 */, |
| 0x4F /* 'O' */, 0x46 /* to pos 150 state 59 */, |
| 0x8D /* '.' */, 0x52 /* to pos 176 state 72 */, |
| /* pos 14: state 1 */ |
| 0xC5 /* 'E' */, 0x01 /* to pos 16 state 2 */, |
| /* pos 16: state 2 */ |
| 0xD4 /* 'T' */, 0x01 /* to pos 18 state 3 */, |
| /* pos 18: state 3 */ |
| 0xA0 /* ' ' */, 0x01 /* to pos 20 state 4 */, |
| /* pos 20: state 4 */ |
| 0x80, 0x00 /* terminal marker */, |
| /* pos 22: state 5 */ |
| 0x6F /* 'o' */, 0x02 /* to pos 26 state 6 */, |
| 0xD4 /* 'T' */, 0x76 /* to pos 260 state 114 */, |
| /* pos 26: state 6 */ |
| 0xF3 /* 's' */, 0x01 /* to pos 28 state 7 */, |
| /* pos 28: state 7 */ |
| 0xF4 /* 't' */, 0x01 /* to pos 30 state 8 */, |
| /* pos 30: state 8 */ |
| 0xBA /* ':' */, 0x01 /* to pos 32 state 9 */, |
| /* pos 32: state 9 */ |
| 0x81, 0x00 /* terminal marker */, |
| /* pos 34: state 10 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 36 state 11 */, |
| /* pos 36: state 11 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 38 state 12 */, |
| /* pos 38: state 12 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 40 state 13 */, |
| /* pos 40: state 13 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 42 state 14 */, |
| /* pos 42: state 14 */ |
| 0xE3 /* 'c' */, 0x01 /* to pos 44 state 15 */, |
| /* pos 44: state 15 */ |
| 0xF4 /* 't' */, 0x01 /* to pos 46 state 16 */, |
| /* pos 46: state 16 */ |
| 0xE9 /* 'i' */, 0x01 /* to pos 48 state 17 */, |
| /* pos 48: state 17 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 50 state 18 */, |
| /* pos 50: state 18 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 52 state 19 */, |
| /* pos 52: state 19 */ |
| 0xBA /* ':' */, 0x01 /* to pos 54 state 20 */, |
| /* pos 54: state 20 */ |
| 0x82, 0x00 /* terminal marker */, |
| /* pos 56: state 21 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 58 state 22 */, |
| /* pos 58: state 22 */ |
| 0xE3 /* 'c' */, 0x01 /* to pos 60 state 23 */, |
| /* pos 60: state 23 */ |
| 0xAD /* '-' */, 0x01 /* to pos 62 state 24 */, |
| /* pos 62: state 24 */ |
| 0xD7 /* 'W' */, 0x01 /* to pos 64 state 25 */, |
| /* pos 64: state 25 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 66 state 26 */, |
| /* pos 66: state 26 */ |
| 0xE2 /* 'b' */, 0x01 /* to pos 68 state 27 */, |
| /* pos 68: state 27 */ |
| 0xD3 /* 'S' */, 0x01 /* to pos 70 state 28 */, |
| /* pos 70: state 28 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 72 state 29 */, |
| /* pos 72: state 29 */ |
| 0xE3 /* 'c' */, 0x01 /* to pos 74 state 30 */, |
| /* pos 74: state 30 */ |
| 0xEB /* 'k' */, 0x01 /* to pos 76 state 31 */, |
| /* pos 76: state 31 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 78 state 32 */, |
| /* pos 78: state 32 */ |
| 0xF4 /* 't' */, 0x01 /* to pos 80 state 33 */, |
| /* pos 80: state 33 */ |
| 0xAD /* '-' */, 0x01 /* to pos 82 state 34 */, |
| /* pos 82: state 34 */ |
| 0x4B /* 'K' */, 0x08 /* to pos 98 state 35 */, |
| 0x50 /* 'P' */, 0x10 /* to pos 116 state 42 */, |
| 0x44 /* 'D' */, 0x27 /* to pos 164 state 66 */, |
| 0x56 /* 'V' */, 0x2F /* to pos 182 state 75 */, |
| 0x4F /* 'O' */, 0x36 /* to pos 198 state 83 */, |
| 0x45 /* 'E' */, 0x3C /* to pos 212 state 90 */, |
| 0x41 /* 'A' */, 0x46 /* to pos 234 state 101 */, |
| 0xCE /* 'N' */, 0x4C /* to pos 248 state 108 */, |
| /* pos 98: state 35 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 100 state 36 */, |
| /* pos 100: state 36 */ |
| 0xF9 /* 'y' */, 0x01 /* to pos 102 state 37 */, |
| /* pos 102: state 37 */ |
| 0x31 /* '1' */, 0x03 /* to pos 108 state 38 */, |
| 0x32 /* '2' */, 0x04 /* to pos 112 state 40 */, |
| 0xBA /* ':' */, 0x25 /* to pos 180 state 74 */, |
| /* pos 108: state 38 */ |
| 0xBA /* ':' */, 0x01 /* to pos 110 state 39 */, |
| /* pos 110: state 39 */ |
| 0x83, 0x00 /* terminal marker */, |
| /* pos 112: state 40 */ |
| 0xBA /* ':' */, 0x01 /* to pos 114 state 41 */, |
| /* pos 114: state 41 */ |
| 0x84, 0x00 /* terminal marker */, |
| /* pos 116: state 42 */ |
| 0xF2 /* 'r' */, 0x01 /* to pos 118 state 43 */, |
| /* pos 118: state 43 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 120 state 44 */, |
| /* pos 120: state 44 */ |
| 0xF4 /* 't' */, 0x01 /* to pos 122 state 45 */, |
| /* pos 122: state 45 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 124 state 46 */, |
| /* pos 124: state 46 */ |
| 0xE3 /* 'c' */, 0x01 /* to pos 126 state 47 */, |
| /* pos 126: state 47 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 128 state 48 */, |
| /* pos 128: state 48 */ |
| 0xEC /* 'l' */, 0x01 /* to pos 130 state 49 */, |
| /* pos 130: state 49 */ |
| 0xBA /* ':' */, 0x01 /* to pos 132 state 50 */, |
| /* pos 132: state 50 */ |
| 0x85, 0x00 /* terminal marker */, |
| /* pos 134: state 51 */ |
| 0xF0 /* 'p' */, 0x01 /* to pos 136 state 52 */, |
| /* pos 136: state 52 */ |
| 0xE7 /* 'g' */, 0x01 /* to pos 138 state 53 */, |
| /* pos 138: state 53 */ |
| 0xF2 /* 'r' */, 0x01 /* to pos 140 state 54 */, |
| /* pos 140: state 54 */ |
| 0xE1 /* 'a' */, 0x01 /* to pos 142 state 55 */, |
| /* pos 142: state 55 */ |
| 0xE4 /* 'd' */, 0x01 /* to pos 144 state 56 */, |
| /* pos 144: state 56 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 146 state 57 */, |
| /* pos 146: state 57 */ |
| 0xBA /* ':' */, 0x01 /* to pos 148 state 58 */, |
| /* pos 148: state 58 */ |
| 0x86, 0x00 /* terminal marker */, |
| /* pos 150: state 59 */ |
| 0xF2 /* 'r' */, 0x01 /* to pos 152 state 60 */, |
| /* pos 152: state 60 */ |
| 0xE9 /* 'i' */, 0x01 /* to pos 154 state 61 */, |
| /* pos 154: state 61 */ |
| 0xE7 /* 'g' */, 0x01 /* to pos 156 state 62 */, |
| /* pos 156: state 62 */ |
| 0xE9 /* 'i' */, 0x01 /* to pos 158 state 63 */, |
| /* pos 158: state 63 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 160 state 64 */, |
| /* pos 160: state 64 */ |
| 0xBA /* ':' */, 0x01 /* to pos 162 state 65 */, |
| /* pos 162: state 65 */ |
| 0x87, 0x00 /* terminal marker */, |
| /* pos 164: state 66 */ |
| 0xF2 /* 'r' */, 0x01 /* to pos 166 state 67 */, |
| /* pos 166: state 67 */ |
| 0xE1 /* 'a' */, 0x01 /* to pos 168 state 68 */, |
| /* pos 168: state 68 */ |
| 0xE6 /* 'f' */, 0x01 /* to pos 170 state 69 */, |
| /* pos 170: state 69 */ |
| 0xF4 /* 't' */, 0x01 /* to pos 172 state 70 */, |
| /* pos 172: state 70 */ |
| 0xBA /* ':' */, 0x01 /* to pos 174 state 71 */, |
| /* pos 174: state 71 */ |
| 0x88, 0x00 /* terminal marker */, |
| /* pos 176: state 72 */ |
| 0x8A /* '.' */, 0x01 /* to pos 178 state 73 */, |
| /* pos 178: state 73 */ |
| 0x89, 0x00 /* terminal marker */, |
| /* pos 180: state 74 */ |
| 0x8A, 0x00 /* terminal marker */, |
| /* pos 182: state 75 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 184 state 76 */, |
| /* pos 184: state 76 */ |
| 0xF2 /* 'r' */, 0x01 /* to pos 186 state 77 */, |
| /* pos 186: state 77 */ |
| 0xF3 /* 's' */, 0x01 /* to pos 188 state 78 */, |
| /* pos 188: state 78 */ |
| 0xE9 /* 'i' */, 0x01 /* to pos 190 state 79 */, |
| /* pos 190: state 79 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 192 state 80 */, |
| /* pos 192: state 80 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 194 state 81 */, |
| /* pos 194: state 81 */ |
| 0xBA /* ':' */, 0x01 /* to pos 196 state 82 */, |
| /* pos 196: state 82 */ |
| 0x8B, 0x00 /* terminal marker */, |
| /* pos 198: state 83 */ |
| 0xF2 /* 'r' */, 0x01 /* to pos 200 state 84 */, |
| /* pos 200: state 84 */ |
| 0xE9 /* 'i' */, 0x01 /* to pos 202 state 85 */, |
| /* pos 202: state 85 */ |
| 0xE7 /* 'g' */, 0x01 /* to pos 204 state 86 */, |
| /* pos 204: state 86 */ |
| 0xE9 /* 'i' */, 0x01 /* to pos 206 state 87 */, |
| /* pos 206: state 87 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 208 state 88 */, |
| /* pos 208: state 88 */ |
| 0xBA /* ':' */, 0x01 /* to pos 210 state 89 */, |
| /* pos 210: state 89 */ |
| 0x8C, 0x00 /* terminal marker */, |
| /* pos 212: state 90 */ |
| 0xF8 /* 'x' */, 0x01 /* to pos 214 state 91 */, |
| /* pos 214: state 91 */ |
| 0xF4 /* 't' */, 0x01 /* to pos 216 state 92 */, |
| /* pos 216: state 92 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 218 state 93 */, |
| /* pos 218: state 93 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 220 state 94 */, |
| /* pos 220: state 94 */ |
| 0xF3 /* 's' */, 0x01 /* to pos 222 state 95 */, |
| /* pos 222: state 95 */ |
| 0xE9 /* 'i' */, 0x01 /* to pos 224 state 96 */, |
| /* pos 224: state 96 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 226 state 97 */, |
| /* pos 226: state 97 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 228 state 98 */, |
| /* pos 228: state 98 */ |
| 0xF3 /* 's' */, 0x01 /* to pos 230 state 99 */, |
| /* pos 230: state 99 */ |
| 0xBA /* ':' */, 0x01 /* to pos 232 state 100 */, |
| /* pos 232: state 100 */ |
| 0x8D, 0x00 /* terminal marker */, |
| /* pos 234: state 101 */ |
| 0xE3 /* 'c' */, 0x01 /* to pos 236 state 102 */, |
| /* pos 236: state 102 */ |
| 0xE3 /* 'c' */, 0x01 /* to pos 238 state 103 */, |
| /* pos 238: state 103 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 240 state 104 */, |
| /* pos 240: state 104 */ |
| 0xF0 /* 'p' */, 0x01 /* to pos 242 state 105 */, |
| /* pos 242: state 105 */ |
| 0xF4 /* 't' */, 0x01 /* to pos 244 state 106 */, |
| /* pos 244: state 106 */ |
| 0xBA /* ':' */, 0x01 /* to pos 246 state 107 */, |
| /* pos 246: state 107 */ |
| 0x8E, 0x00 /* terminal marker */, |
| /* pos 248: state 108 */ |
| 0xEF /* 'o' */, 0x01 /* to pos 250 state 109 */, |
| /* pos 250: state 109 */ |
| 0xEE /* 'n' */, 0x01 /* to pos 252 state 110 */, |
| /* pos 252: state 110 */ |
| 0xE3 /* 'c' */, 0x01 /* to pos 254 state 111 */, |
| /* pos 254: state 111 */ |
| 0xE5 /* 'e' */, 0x01 /* to pos 256 state 112 */, |
| /* pos 256: state 112 */ |
| 0xBA /* ':' */, 0x01 /* to pos 258 state 113 */, |
| /* pos 258: state 113 */ |
| 0x8F, 0x00 /* terminal marker */, |
| /* pos 260: state 114 */ |
| 0xD4 /* 'T' */, 0x01 /* to pos 262 state 115 */, |
| /* pos 262: state 115 */ |
| 0xD0 /* 'P' */, 0x01 /* to pos 264 state 116 */, |
| /* pos 264: state 116 */ |
| 0xAF /* '/' */, 0x01 /* to pos 266 state 117 */, |
| /* pos 266: state 117 */ |
| 0xB1 /* '1' */, 0x01 /* to pos 268 state 118 */, |
| /* pos 268: state 118 */ |
| 0xAE /* '.' */, 0x01 /* to pos 270 state 119 */, |
| /* pos 270: state 119 */ |
| 0xB1 /* '1' */, 0x01 /* to pos 272 state 120 */, |
| /* pos 272: state 120 */ |
| 0xA0 /* ' ' */, 0x01 /* to pos 274 state 121 */, |
| /* pos 274: state 121 */ |
| 0x90, 0x00 /* terminal marker */, |
| /* total size 276 bytes */ |
| |
| |
| }; |
| |
| #define PARALLEL 30 |
| |
| struct state { |
| char c[PARALLEL]; |
| int state[PARALLEL]; |
| int count; |
| int bytepos; |
| }; |
| |
| struct state state[1000]; |
| int next = 1; |
| |
| int lextable_decode(int pos, char c) |
| { |
| while (1) { |
| if (lextable[pos + 1] == 0) // terminal marker |
| return pos; |
| |
| if ((lextable[pos] & 0x7f) == c) |
| return pos + (lextable[pos + 1] << 1); |
| |
| if (lextable[pos] & 0x80) |
| return -1; |
| |
| pos += 2; |
| } |
| return pos; |
| } |
| |
| |
| int main(void) |
| { |
| int n = 0; |
| int m = 0; |
| int prev; |
| char c; |
| int walk; |
| int saw; |
| int y; |
| |
| while (n < sizeof(set) / sizeof(set[0])) { |
| |
| m = 0; |
| walk = 0; |
| prev = 0; |
| |
| while (set[n][m]) { |
| |
| saw = 0; |
| for (y = 0; y < state[walk].count; y++) |
| if (state[walk].c[y] == set[n][m]) { /* exists */ |
| walk = state[walk].state[y]; /* go forward */ |
| saw = 1; |
| break; |
| } |
| |
| if (saw) |
| goto again; |
| |
| /* something we didn't see before */ |
| |
| state[walk].c[state[walk].count] = set[n][m]; |
| |
| state[walk].state[state[walk].count] = next; |
| state[walk].count++; |
| |
| // if (set[n][m + 1] == '\0') /* terminal */ |
| walk = next++; |
| again: |
| m++; |
| } |
| |
| state[walk].c[0] = n; |
| state[walk].state[0] = 0; /* terminal marker */ |
| state[walk].count = 1; |
| |
| n++; |
| |
| } |
| |
| walk = 0; |
| for (n = 0; n < next; n++) { |
| state[n].bytepos = walk; |
| walk += (2 * state[n].count); |
| } |
| #if 0 |
| for (n = 0; n < next; n++) { |
| fprintf(stderr, "State %d\n", n); |
| for (m = 0; m < state[n].count; m++) |
| fprintf(stderr, "'%c' -> %d\n", state[n].c[m], state[n].state[m]); |
| fprintf(stderr, "(stop)\n"); |
| } |
| #endif |
| |
| walk = 0; |
| for (n = 0; n < next; n++) { |
| fprintf(stderr, "/* pos %d: state %d */\n", walk, n); |
| for (m = 0; m < state[n].count; m++) { |
| y = state[n].c[m]; |
| saw = state[n].state[m]; |
| |
| if (m == state[n].count - 1) |
| y |= 0x80; /* last option */ |
| |
| if (saw == 0) // c is a terminal then |
| fprintf(stderr, " 0x%02X, 0x00 /* terminal marker */, \n", y); |
| else { // c is a character and we need a byte delta |
| if ((state[saw].bytepos - walk) / 2 > 0xff) { |
| fprintf(stderr, "Tried to jump > 510 bytes ahead\n"); |
| return 1; |
| } |
| prev = y &0x7f; |
| if (prev < 32 || prev > 126) |
| prev = '.'; |
| fprintf(stderr, " 0x%02X /* '%c' */, 0x%02X /* to pos %d state %d */,\n", y, prev, (state[saw].bytepos - walk) / 2, state[saw].bytepos, saw); |
| } |
| walk += 2; |
| } |
| } |
| |
| fprintf(stderr, "/* total size %d bytes */\n", walk); |
| |
| for (n = 0; n < sizeof(set) / sizeof(set[0]); n++) { |
| walk = 0; |
| m = 0; |
| |
| fprintf(stderr, "Trying %s\n", set[n]); |
| |
| while (set[n][m]) { |
| walk = lextable_decode(walk, set[n][m]); |
| if (walk < 0) { |
| fprintf(stderr, "failed\n"); |
| break; |
| } |
| if (lextable[walk + 1] == 0) { |
| fprintf(stderr, "decode: %d\n", lextable[walk] & 0x7f); |
| break; |
| } |
| m++; |
| } |
| } |
| |
| return 0; |
| } |
| |
| |
| |