* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
-#include <vlc/vlc.h>
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
#include <vlc_rand.h>
#ifndef WIN32
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
+#include <vlc_fs.h>
#include <vlc_md5.h>
uint8_t key[BLOCK_SIZE];
/* Get non-predictible value as key for HMAC */
- int fd = open (randfile, O_RDONLY);
+ int fd = vlc_open (randfile, O_RDONLY);
if (fd == -1)
return; /* Uho! */
uint64_t val;
struct md5_s mdi, mdo;
+ InitMD5 (&mdi);
+ InitMD5 (&mdo);
+
pthread_mutex_lock (&lock);
if (counter == 0)
vlc_rand_init ();
val = counter++;
- pthread_mutex_unlock (&lock);
- InitMD5 (&mdi);
AddMD5 (&mdi, ikey, sizeof (ikey));
+ AddMD5 (&mdo, okey, sizeof (okey));
+ pthread_mutex_unlock (&lock);
+
AddMD5 (&mdi, &stamp, sizeof (stamp));
AddMD5 (&mdi, &val, sizeof (val));
EndMD5 (&mdi);
- InitMD5 (&mdo);
- AddMD5 (&mdo, okey, sizeof (okey));
AddMD5 (&mdo, mdi.p_digest, sizeof (mdi.p_digest));
EndMD5 (&mdo);
memcpy (p_buf, &val, count);
break;
}
-
+
memcpy (p_buf, &val, sizeof (val));
count -= sizeof (val);
p_buf += sizeof (val);
}
}
#endif
+
+static struct
+{
+ bool init;
+ unsigned short subi[3];
+ vlc_mutex_t lock;
+} rand48 = { false, { 0, 0, 0, }, VLC_STATIC_MUTEX, };
+
+static void init_rand48 (void)
+{
+ if (!rand48.init)
+ {
+ vlc_rand_bytes (rand48.subi, sizeof (rand48.subi));
+#if 0 // short would be more than 16-bits ?
+ for (unsigned i = 0; i < 3; i++)
+ subi[i] &= 0xffff;
+#endif
+ }
+}
+
+/**
+ * PRNG uniformly distributed between 0.0 and 1.0 with 48-bits precision.
+ *
+ * @note Contrary to POSIX drand48(), this function is thread-safe.
+ * @warning Series generated by this function are not reproducible.
+ * Use erand48() if you need reproducible series.
+ *
+ * @return a double value within [0.0, 1.0] inclusive
+ */
+double vlc_drand48 (void)
+{
+ double ret;
+
+ vlc_mutex_lock (&rand48.lock);
+ init_rand48 ();
+ ret = erand48 (rand48.subi);
+ vlc_mutex_unlock (&rand48.lock);
+ return ret;
+}
+
+/**
+ * PRNG uniformly distributed between 0 and 2^32 - 1.
+ *
+ * @note Contrary to POSIX lrand48(), this function is thread-safe.
+ * @warning Series generated by this function are not reproducible.
+ * Use nrand48() if you need reproducible series.
+ *
+ * @return a double value within [0.0, 1.0] inclusive
+ */
+long vlc_lrand48 (void)
+{
+ long ret;
+
+ vlc_mutex_lock (&rand48.lock);
+ init_rand48 ();
+ ret = nrand48 (rand48.subi);
+ vlc_mutex_unlock (&rand48.lock);
+ return ret;
+}
+
+/**
+ * PRNG uniformly distributed between -2^32 and 2^32 - 1.
+ *
+ * @note Contrary to POSIX mrand48(), this function is thread-safe.
+ * @warning Series generated by this function are not reproducible.
+ * Use jrand48() if you need reproducible series.
+ *
+ * @return a double value within [0.0, 1.0] inclusive
+ */
+long vlc_mrand48 (void)
+{
+ long ret;
+
+ vlc_mutex_lock (&rand48.lock);
+ init_rand48 ();
+ ret = jrand48 (rand48.subi);
+ vlc_mutex_unlock (&rand48.lock);
+ return ret;
+}