depp · April 10, 2022 15:23 · Apr 10, 2022
diff --git a/MacReader.c b/MacReader.c
@@ -0,0 +1,83 @@
+// Location of the application: volume & directory, or 0 if unknown.
+static short gAppVolRefNum;
+static long gAppParID;
+
+// Get an FSSpec pointing to a file with the given name.
+static OSErr GetDataFile(FSSpec *spec, const char *filename) {
+	ProcessSerialNumber psn = {0, kCurrentProcess};
+	ProcessInfoRec info = {0};
+	FSSpec app_spec;
+	Str255 pname;
+	size_t len;
+
+	// Get the volume & directory containing the application.
+	if (gAppVolRefNum == 0) {
+		info.processInfoLength = sizeof(info);
+		info.processAppSpec = &app_spec;
+		;
+		err = GetProcessInformation(&psn, info);
+		if (err != noErr) {
+			return err;
+		}
+		gAppVolRefNum = app_spec.volRefNum;
+		gAppParID = app_spec.parID;
+	}
+
+	// Convert filename to Pascal string.
+	len = strlen(filename);
+	assert(len <= 255);
+	pname[0] = len;
+	memcpy(pname + 1, filename, len);
+
+	return FSMakeFSSpec(gAppVolRef, gAppParID, pname, spec);
+}
+
+// Takes a Pascal string as an argument.
+FILE *OpenData(const char *filename) {
+	FSSpec spec;
+	OSErr err;
+
+	err = GetDataFile(&spec, filename);
+	if (err != noErr) {
+		printf("FSMakeFSSpec: %d\n", err);
+		return NULL;
+	}
+	return FSp_fopen(&spec, "rb");
+}
+
+// Read an entire file into memory.
+uint8_t *readFully(const char *filename) {
+	short refNum;
+	FSSpec spec;
+	OSErr err;
+	long size, count;
+	uint8_t *resultBuffer;
+
+	err = GetDataFile(&spec, filename);
+	if (err != noErr) {
+		printf("GetDataFile: %d\n", err);
+		return NULL;
+	}
+	err = FSpOpenDF(&spec, fsRdPerm, &refNum);
+	if (err != noErr) {
+		printf("FSpOpenDF: %d\n", err);
+		return NULL;
+	}
+	err = GetEOF(refNum, &size);
+	if (err != noErr) {
+		printf("GetEOF: %d\n", err);
+		FSClose(refNum);
+		return NULL;
+	}
+	resultBuffer = calloc(1, size);
+	assert(resultBuffer);
+	count = size;
+	err = FSRead(refNum, &count, resultBuffer);
+	FSClose(refNum);
+	if (err != noErr) {
+		printf("FSRead: %d\n", err);
+		free(resultBuffer);
+		return NULL;
+	}
+	return resultBuffer;
+}