1 files changed, 82 insertions, 0 deletions
diff --git a/tests/get-timezone.c b/tests/get-timezone.c
new file mode 100644
index 0000000..1c612d2
--- /dev/null
+++ b/tests/get-timezone.c
@@ -0,0 +1,82 @@
+/*
+ * Compile with:
+ * gcc $(pkg-config --cflags --libs libgpod-1.0) -o tz ./get-timezone.c
+ *
+ * then run:
+ * ./tz <ipod-mountpoint>
+ *
+ * This should output something like:
+ * Timezone: UTC+1 DST
+ *
+ * which means I'm living in an UTC+1 timezone with DST which adds a 1 hour
+ * shift, ie my local time is UTC+2. DST won't be shown if not active.
+ *
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <itdb.h>
+
+int main (int argc, char **argv)
+{
+    char *mountpoint;
+    char *device_dir;
+    char *prefs_filename;
+    FILE *f;
+    int result;
+    gint32 timezone;
+    const int GMT_OFFSET = 0x19;
+
+    if (argc >= 2) {
+        mountpoint = argv[1];
+    } else {
+        g_print ("Usage: %s <mountpoint>\n\n", g_basename(argv[0]));
+        return -1;
+    }
+
+    device_dir = itdb_get_device_dir (mountpoint);
+    if (device_dir == NULL) {
+        g_print ("No iPod mounted at %s\n", mountpoint);
+        return -1;
+    }
+    prefs_filename = itdb_get_path (device_dir, "Preferences");
+    g_free (device_dir);
+
+    f = fopen (prefs_filename, "r");
+    if (f == NULL) {
+        g_print ("Couldn't open %s: %s\n", prefs_filename, g_strerror (errno));
+        g_free (prefs_filename);
+        return -1;
+    }
+
+    result = fseek (f, 0xB10, SEEK_SET);
+    if (result != 0) {
+        g_print ("Couldn't seek in %s: %s\n", prefs_filename,
+                 g_strerror (errno));
+        fclose (f);
+        g_free (prefs_filename);
+        return -1;
+    }
+
+    result = fread (&timezone, sizeof (timezone), 1, f);
+    if (result != 1) {
+        g_print ("Couldn't read from %s: %s\n", prefs_filename,
+                 g_strerror (errno));
+        fclose (f);
+        g_free (prefs_filename);
+    }
+
+    fclose (f);
+    g_free (prefs_filename);
+
+    timezone = GINT32_FROM_LE (timezone);
+    timezone -= GMT_OFFSET;
+
+    g_print ("Timezone: UTC%+d", timezone >> 1);
+    if (timezone & 1) {
+        g_print (" DST");
+    }
+    g_print ("\n");
+
+    return 0;
+}