329 lines
7.8 KiB
C
329 lines
7.8 KiB
C
// arbitrary terminology i made up on the spot:
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// "entry" = code as exposed to user, in ASCII.
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// "code" = code as indices into lut, used internally.
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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typedef uint32_t u32;
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typedef uint64_t u64;
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#define lament(...) fprintf(stderr, __VA_ARGS__)
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#define sizeofel(a) (sizeof(*(a)))
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#define LEN(a) (sizeof(a) / sizeofel(a))
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const char *lut[] = {
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// characters within the same string are considered the same.
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// that means the number of choices for a single character
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// goes down from 36 to 28.
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"N", "P", "Q", "R",
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"T", "W", "X", "Y",
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"17I", "2Z", "5S", "8B",
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"0OD", "UV", "3", "4",
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"6", "9", "A", "C",
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"E", "F", "G", "H",
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"J", "K", "L", "M",
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};
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enum {lutlen = LEN(lut)}; // should be 28.
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const u32 bases[] = {
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64,
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11,
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21,
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2,
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21,
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8,
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6, // dummy value.
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};
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enum {
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MT_CHOICE = -1,
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};
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typedef enum {
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MT_YOSHI,
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MT_PEACH,
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MT_MARIO,
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MT_BOWSER,
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MT_BOO,
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MT_DK,
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MT_BABY_MARIO,
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MT_TOAD,
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MT_WALUIGI,
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MT_WARIO,
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MT_LUIGI,
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MT_DAISY,
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MT_BIRDO,
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MT_SHYGUY,
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MT_DK_JR,
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MT_PARATROOPA,
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} character_t;
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typedef enum {
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MT_SINGLES_GAME,
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MT_SINGLES_TIME_3,
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MT_SINGLES_TIME_5,
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MT_SINGLES_BALL_1,
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MT_SINGLES_BALL_3,
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MT_SINGLES_POINT_3,
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MT_SINGLES_POINT_5,
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MT_DOUBLES_GAME_1,
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MT_DOUBLES_TIME_3,
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MT_DOUBLES_BALL_1,
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MT_DOUBLES_POINT_3,
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} gamemode_t;
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typedef enum {
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MT_HARD,
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MT_CLAY,
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MT_GRASS,
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MT_COMPOSITION,
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MT_OPEN,
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} court_t;
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typedef struct {
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char code[9];
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// data[0]: cup name
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// data[1]: gamemode
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// data[2]: player character (-1 for player's choice)
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// data[3]: unknown (boolean)
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// data[4]: opponent character (-1 for player's choice)
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// data[5]: unknown
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// data[6]: court (-1 for player's choice)
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u32 data[7];
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} code_t;
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code_t translate(const char *entry) {
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code_t code = {0};
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for (int i = 0; i < 9; i++) {
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char e = entry[i];
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if (e == '\0') return code;
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for (int j = 0; j < lutlen; j++) {
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const char *c = lut[j];
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while (*c != '\0') {
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if (e == *c) {
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code.code[i] = j;
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goto nextchar;
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}
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c++;
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}
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}
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nextchar:
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;
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}
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return code;
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}
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int check_ranges(const code_t *code) {
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const u32 choice = (u32)MT_CHOICE;
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const u32 *data = code->data;
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return
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(data[0] < bases[0]) &&
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(data[1] < bases[1]) &&
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(data[2] + 1 < bases[2] - 4) &&
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(data[3] < bases[3]) &&
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(data[4] + 1 < bases[4] - 4) &&
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(data[5] < bases[5]) &&
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(data[6] + 1 < bases[6]) &&
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(data[2] == choice || data[2] != data[4]) &&
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(data[1] < 7 || (data[2] != choice && data[4] != choice));
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}
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int decode_data(code_t *code) {
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u32 part0 = 0, part1 = 0;
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for (int i = 5; i >= 0; i--) part0 = part0 * lutlen + code->code[i];
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for (int i = 8; i >= 6; i--) part1 = part1 * lutlen + code->code[i];
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u32 checksum = (part0 + 0x2AE0) % (lutlen * lutlen * lutlen);
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#if !NDEBUG
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lament("merged data: %08X\n", part0);
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lament("expected checksum: %08X\n", part1);
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lament("actual checksum: %08X\n", checksum);
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#endif
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u32 leftover = part0 ^ 0x02AAAAAA;
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code->data[0] = leftover % bases[0]; leftover /= bases[0];
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code->data[1] = leftover % bases[1]; leftover /= bases[1];
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code->data[2] = leftover % bases[2]; leftover /= bases[2];
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code->data[3] = leftover % bases[3]; leftover /= bases[3];
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code->data[4] = leftover % bases[4]; leftover /= bases[4];
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code->data[5] = leftover % bases[5]; leftover /= bases[5];
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code->data[6] = leftover;
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code->data[2]--;
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code->data[4]--;
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code->data[6]--;
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#if !NDEBUG
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lament("stored data:");
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for (int i = 0; i < 7; i++) lament(" %i", code->data[i]);
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lament("\n");
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#endif
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if (checksum != part1) return 0;
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if (!check_ranges(code)) return 0;
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return 1;
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}
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int encode_data(code_t *code) {
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if (!check_ranges(code)) return 0;
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u32 combined = 0;
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combined = code->data[6] + 1;
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combined = combined * bases[5] + code->data[5];
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combined = combined * bases[4] + code->data[4] + 1;
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combined = combined * bases[3] + code->data[3];
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combined = combined * bases[2] + code->data[2] + 1;
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combined = combined * bases[1] + code->data[1];
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combined = combined * bases[0] + code->data[0];
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combined = combined ^ 0x02AAAAAA;
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u32 checksum = (combined + 0x2AE0) % (lutlen * lutlen * lutlen);
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#if !NDEBUG
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lament("merged data: %08X\n", combined);
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lament("checksum: %08X\n", checksum);
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#endif
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u32 part0 = combined, part1 = checksum;
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for (int i = 0; i <= 5; i++) {
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code->code[i] = part0 % lutlen; part0 /= lutlen;
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}
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for (int i = 6; i <= 8; i++) {
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code->code[i] = part1 % lutlen; part1 /= lutlen;
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}
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return 1;
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}
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int validate_entry(const char *entry) {
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code_t code = translate(entry);
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#if !NDEBUG
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lament("character mapping:");
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for (int i = 0; i < 9; i++) {
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lament(" %c->%i,", entry[i], code.code[i]);
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}
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lament("\n");
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#endif
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return decode_data(&code);
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}
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static void print_code(const code_t *code) {
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for (int j = 0; j < 9; j++) {
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int index = code->code[j];
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printf("%c", lut[index][0]);
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}
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printf("\n");
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}
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static u64 prng_state = 1;
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static u32 prng() {
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prng_state = 3935559000370003845 * prng_state + 1;
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return prng_state ^ (prng_state >> 32);
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}
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int bruteforce(int count) {
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/* with a fixed seed, this is useful for testing.
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the first 10 results should be:
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8RPEHR8R4
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MNXKWQMNE
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CE922RCER
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MQ1KMQMQG
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2N9GGR2NR
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25L53R250
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15R09R159
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9R9LMQ9RR
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L312MQL3G
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P93M6QP9N
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*/
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int found = 0;
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code_t code = {0};
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while (found < count) {
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for (int j = 0; j < 9; j++) {
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code.code[j] = prng() % lutlen;
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}
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if (decode_data(&code)) {
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found++;
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print_code(&code);
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}
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}
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return 1;
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}
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#ifndef TENNIS_NO_MAIN
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int main(int argc, char **argv) {
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if (argc == 1) {
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// self-test with codes known before this program was written.
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#define TEST(entry) if (!validate_entry(entry)) return -1
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TEST("48HWOR482");
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TEST("5G3LTQ5GN");
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TEST("A3W5KQA3C");
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TEST("ARM6JQARU");
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TEST("E880MPE8K");
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TEST("E8ULJRE8M");
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TEST("EPJEGREP5");
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TEST("GH4KNQGHP");
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TEST("H6L3MPH60");
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TEST("HH4KNQHHP");
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TEST("J6M9PQJ6U");
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TEST("JEP8YQJE4");
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TEST("LA98JRLAR");
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TEST("LQM1MPLQU");
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TEST("LTHWYQLT2");
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TEST("M1C2YQM1W");
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TEST("MM55MQMMJ");
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TEST("N24K8QN2P");
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TEST("OF9XFQOFR");
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TEST("P4K6GRP48");
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TEST("TE6WARTEQ");
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TEST("TQJEGRTQ5");
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TEST("UOUFMPUOM");
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TEST("V2UFMPUZM");
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TEST("W2HEGRW22");
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TEST("WQJEGRWQ5");
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TEST("WRWQARWRC");
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TEST("YQJEGRYQ5");
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#undef TEST
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return 0;
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}
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code_t code = {0};
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int code_i = 0;
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int invalid_count = 0;
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for (int i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (strlen(arg) == 9) {
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//if (validate_entry(arg)) printf("%s\n", arg);
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invalid_count += !validate_entry(arg);
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} else if (!strcmp(arg, "bruteforce")) {
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invalid_count += !bruteforce(10);
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} else {
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u32 datum = strtoul(arg, NULL, 0);
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code.data[code_i] = datum;
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code_i++;
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if (code_i >= 7) {
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code_i = 0;
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if (encode_data(&code)) {
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print_code(&code);
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} else {
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invalid_count++;
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}
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}
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}
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}
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return invalid_count;
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}
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#endif
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