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Added a custom automation combo for Tsuri Sensei, to avoid an in-game buffer-overflow

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This commit is contained in:
Lior Halphon 2016-10-14 01:30:54 +03:00
parent 9ca7540c69
commit 3fc4fcc538
1 changed files with 17 additions and 4 deletions
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21
Tester/main.c
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@ -20,7 +20,7 @@ static char *bmp_filename;
static char *log_filename; static char *log_filename;
static FILE *log_file; static FILE *log_file;
static void replace_extension(const char *src, size_t length, char *dest, const char *ext); static void replace_extension(const char *src, size_t length, char *dest, const char *ext);
static bool push_start_a, start_is_not_first, a_is_bad, b_is_confirm, push_faster, push_slower, do_not_stop; static bool push_start_a, start_is_not_first, a_is_bad, b_is_confirm, push_faster, push_slower, do_not_stop, push_a_twice;
static unsigned int test_length = 60 * 40; static unsigned int test_length = 60 * 40;
GB_gameboy_t gb; GB_gameboy_t gb;
@ -46,10 +46,13 @@ static void vblank(GB_gameboy_t *gb)
load graphics. */ load graphics. */
if (push_start_a && (frames < test_length - 120 || do_not_stop)) { if (push_start_a && (frames < test_length - 120 || do_not_stop)) {
unsigned combo_length = 40; unsigned combo_length = 40;
if (start_is_not_first) combo_length = 60; /* The start item in the menu is not the first, so also push down */ if (start_is_not_first || push_a_twice) combo_length = 60; /* The start item in the menu is not the first, so also push down */
else if (a_is_bad) combo_length = 20; /* Pressing A has a negative effect (when trying to start the game). */ else if (a_is_bad) combo_length = 20; /* Pressing A has a negative effect (when trying to start the game). */
switch ((push_faster? frames * 2 : push_slower? frames / 2 : frames) % combo_length) { switch ((push_faster ? frames * 2 :
push_slower ? frames / 2 :
push_a_twice? frames / 4:
frames) % combo_length) {
case 0: case 0:
gb->keys[7] = true; // Start down gb->keys[7] = true; // Start down
break; break;
@ -63,11 +66,15 @@ static void vblank(GB_gameboy_t *gb)
gb->keys[b_is_confirm? 5: 4] = false; // A up (or B) gb->keys[b_is_confirm? 5: 4] = false; // A up (or B)
break; break;
case 40: case 40:
if (gb->boot_rom_finished) { if (push_a_twice) {
gb->keys[b_is_confirm? 5: 4] = true; // A down (or B)
}
else if (gb->boot_rom_finished) {
gb->keys[3] = true; // D-Pad Down down gb->keys[3] = true; // D-Pad Down down
} }
break; break;
case 50: case 50:
gb->keys[b_is_confirm? 5: 4] = false; // A down (or B)
gb->keys[3] = false; // D-Pad Down up gb->keys[3] = false; // D-Pad Down up
break; break;
} }
@ -307,6 +314,12 @@ int main(int argc, char **argv)
push_faster = strcmp((const char *)(gb.rom + 0x134), "MOGURA DE PON!") == 0; push_faster = strcmp((const char *)(gb.rom + 0x134), "MOGURA DE PON!") == 0;
push_slower = strcmp((const char *)(gb.rom + 0x134), "BAKENOU") == 0; push_slower = strcmp((const char *)(gb.rom + 0x134), "BAKENOU") == 0;
do_not_stop = strcmp((const char *)(gb.rom + 0x134), "SPACE INVADERS") == 0; do_not_stop = strcmp((const char *)(gb.rom + 0x134), "SPACE INVADERS") == 0;
/* Pressing start while in the map in Tsuri Sensi will leak an internal screen-stack which
will eventually overflow, override an array of jump-table indexes, jump to a random
address, execute an invalid opcode, and crash. Pressing A twice while slowing down
will prevent this scenario. */
push_a_twice = strcmp((const char *)(gb.rom + 0x134), "TURI SENSEI V1") == 0;
/* Run emulation */ /* Run emulation */
running = true; running = true;