add random number generation code

darcs-hash:20070131115247-c9803-7ab718af8e311c0c37df2aa92343a6bdc1b9d30c.gz

6 files changed, 175 insertions, 0 deletions

diff --git a/random/Makefile.am b/random/Makefile.am
new file mode 100644
index 0000000..38e2841
--- /dev/null
+++ b/random/Makefile.am
@@ -0,0 +1,17 @@
+
+AM_CFLAGS = -Wall -Werror $(GLIB_CFLAGS)
+
+noinst_LTLIBRARIES = librandom.la
+
+librandom_la_SOURCES = \
+	random.h \
+	random.c \
+	random-glib.h \
+	random-glib.c
+
+check_PROGRAMS = test
+
+test_LDADD = $(GLIB_LIBS) librandom.la
+
+TESTS = $(check_PROGRAMS)
+
diff --git a/random/random-glib.c b/random/random-glib.c
new file mode 100644
index 0000000..420f5d3
--- /dev/null
+++ b/random/random-glib.c
@@ -0,0 +1,43 @@
+
+#include "random-glib.h"
+
+static void
+rng_seed (NiceRNG *rng, guint32 seed)
+{
+  g_random_set_seed (seed);
+}
+
+static void
+rng_generate_bytes (NiceRNG *rng, guint len, gchar *buf)
+{
+  guint i;
+
+  for (i = 0; i < len; i++)
+    buf[i] = g_random_int_range (0, 256);
+}
+
+static guint
+rng_generate_int (NiceRNG *rng, guint low, guint high)
+{
+  return g_random_int_range (low, high);
+}
+
+static void
+rng_free (NiceRNG *rng)
+{
+  g_slice_free (NiceRNG, rng);
+}
+
+NiceRNG *
+nice_glib_rng_new (void)
+{
+  NiceRNG *ret;
+
+  ret = g_slice_new0 (NiceRNG);
+  ret->seed = rng_seed;
+  ret->generate_bytes = rng_generate_bytes;
+  ret->generate_int = rng_generate_int;
+  ret->free = rng_free;
+  return ret;
+}
+
diff --git a/random/random-glib.h b/random/random-glib.h
new file mode 100644
index 0000000..22e53ed
--- /dev/null
+++ b/random/random-glib.h
@@ -0,0 +1,17 @@
+
+#ifndef _RANDOM_GLIB_H
+#define _RANDOM_GLIB_H
+
+#include <glib.h>
+
+#include "random.h"
+
+G_BEGIN_DECLS
+
+NiceRNG *
+nice_glib_rng_new (void);
+
+G_END_DECLS
+
+#endif /* _RANDOM_GLIB_H */
+
diff --git a/random/random.c b/random/random.c
new file mode 100644
index 0000000..321f863
--- /dev/null
+++ b/random/random.c
@@ -0,0 +1,39 @@
+
+#include "random.h"
+#include "random-glib.h"
+
+NiceRNG *
+nice_rng_new ()
+{
+  NiceRNG *rng;
+
+  rng = nice_glib_rng_new ();
+  rng->seed (rng, 0);
+  return rng;
+}
+
+void
+nice_rng_generate_bytes (NiceRNG *rng, guint len, gchar *buf)
+{
+  rng->generate_bytes (rng, len, buf);
+}
+
+guint
+nice_rng_generate_int (NiceRNG *rng, guint low, guint high)
+{
+  return rng->generate_int (rng, low, high);
+}
+
+void
+nice_rng_generate_bytes_print (NiceRNG *rng, guint len, gchar *buf)
+{
+  guint i;
+  gchar *chars =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    "abcdefghijklmnopqrstuvwxyz"
+    "01234567890";
+
+  for (i = 0; i < len; i++)
+    buf[i] = chars[nice_rng_generate_int (rng, 0, 62)];
+}
+
diff --git a/random/random.h b/random/random.h
new file mode 100644
index 0000000..2e31e63
--- /dev/null
+++ b/random/random.h
@@ -0,0 +1,40 @@
+
+#ifndef _RANDOM_H
+#define _RANDOM_H
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+typedef struct _NiceRNG NiceRNG;
+
+struct _NiceRNG {
+  void (*seed) (NiceRNG *src, guint32 seed);
+  void (*generate_bytes) (NiceRNG *src, guint len, gchar *buf);
+  guint (*generate_int) (NiceRNG *src, guint low, guint high);
+  void (*free) (NiceRNG *src);
+  gpointer priv;
+};
+
+NiceRNG *
+nice_rng_new (void);
+
+void
+nice_rng_seed (NiceRNG *rng, guint32 seed);
+
+void
+nice_rng_generate_bytes (NiceRNG *rng, guint len, gchar *buf);
+
+void
+nice_rng_generate_bytes_print (NiceRNG *rng, guint len, gchar *buf);
+
+guint
+nice_rng_generate_int (NiceRNG *rng, guint low, guint high);
+
+void
+nice_rng_free (NiceRNG *rng);
+
+G_END_DECLS
+
+#endif // _RANDOM_H
+
diff --git a/random/test.c b/random/test.c
new file mode 100644
index 0000000..8c59938
--- /dev/null
+++ b/random/test.c
@@ -0,0 +1,19 @@
+
+#include <string.h>
+
+#include "random.h"
+
+int
+main (void)
+{
+  NiceRNG *rng;
+  gchar buf[9];
+
+  rng = nice_rng_new ();
+  nice_rng_generate_bytes_print (rng, 8, buf);
+  buf[8] = '\0';
+  //g_debug ("%s", buf);
+  g_assert (0 == strcmp (buf, "S9PObXR5"));
+  return 0;
+}
+