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Allow bounded 128 KiB memory-card extensions

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This commit is contained in:
Matthew Stanley
2026-10-12 20:00:55 -07:00
parent 6e95db7c15
commit fc2e241386
2 changed files with 41 additions and 1 deletions
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runtime/include/memcard.h
+1 -1
View File
@@ -10,7 +10,7 @@ extern "C" {
#define MEMCARD_SIZE (128 * 1024) /* 128KB per card */
#define MEMCARD_SECTOR_SIZE 128
#define MEMCARD_SECTORS 1024
#define MEMCARD_EXTENSION_MAX 65536u
#define MEMCARD_EXTENSION_MAX 131072u
/* Optional game-owned metadata after the standard 128KiB image. The serial
* device and raw export see only the standard image. A missing codec preserves
runtime/tests/test_memcard_extensions.c
+40
View File
@@ -13,6 +13,24 @@
#define SECTOR 400
static uint8_t base[MEMCARD_SIZE], saved[MEMCARD_SIZE];
static int loads, save_reject, load_reject, have_tail[2];
static uint32_t large_size;
static int large_load(int card, const uint8_t* raw, const uint8_t* tail, uint32_t size) {
CHECK(card == 0 || card == 1);
CHECK(raw[0] == 'M' && raw[1] == 'C');
CHECK(size == (card == 0 ? large_size : 0));
for (uint32_t i = 0; i < size; ++i) CHECK(tail[i] == 'X');
return 0;
}
static int large_save(int card, const uint8_t* raw, uint8_t* tail, uint32_t capacity) {
CHECK(raw[0] == 'M' && raw[1] == 'C');
CHECK(capacity == MEMCARD_EXTENSION_MAX);
if (card != 0) return 0;
CHECK(large_size <= capacity);
memset(tail, 'X', large_size);
return (int)large_size;
}
static long file_size(const char* path) {
FILE* f = fopen(path, "rb");
@@ -133,6 +151,28 @@ int main(void) {
load_reject = 0;
CHECK(memcard_reload_bound() == 0);
/* The former cap, its first new byte, and the exact new cap all survive
* both an absent codec and a codec refresh/reload, byte for byte. */
const uint32_t sizes[] = {65536u, 65537u, MEMCARD_EXTENSION_MAX};
for (unsigned i = 0; i < sizeof sizes / sizeof sizes[0]; ++i) {
large_size = sizes[i];
memcard_set_extension_codec(NULL, NULL);
CHECK(memcard_format_file(PATH0) == 0);
append_tail(large_size);
CHECK(memcard_reload_bound() == 0);
write_sector(83);
memcard_flush(0);
CHECK(memcard_last_flush_result(0) == 0 && !dirty());
CHECK(file_size(PATH0) == (long)(MEMCARD_SIZE + large_size));
memcard_set_extension_codec(large_load, large_save);
CHECK(memcard_reload_bound() == 0);
write_sector(84);
memcard_flush(0);
CHECK(memcard_last_flush_result(0) == 0 && !dirty());
CHECK(file_size(PATH0) == (long)(MEMCARD_SIZE + large_size));
CHECK(memcard_reload_bound() == 0);
}
/* Oversized tails cannot be accidentally replaced with a shorter image. */
memcard_set_extension_codec(NULL, NULL);
CHECK(memcard_format_file(PATH0) == 0);