uuid: Add module for UUID generation

[src/app-framework-binder.git] / src / uuid.c

diff --git a/src/uuid.c b/src/uuid.c
new file mode 100644 (file)
index 0000000..c682080
--- /dev/null
+++ b/src/uuid.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2016-2019 "IoT.bzh"
+ * Author: José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <uuid/uuid.h>
+
+#include "uuid.h"
+
+/**
+ * generate a new fresh 'uuid'
+ */
+void uuid_new_binary(uuid_binary_t uuid)
+{
+#if defined(USE_UUID_GENERATE)
+       uuid_generate(uuid);
+#else
+       struct timespec ts;
+       static uint16_t pid;
+       static uint16_t counter;
+       static char state[32];
+       static struct random_data rdata;
+
+       int32_t x;
+       clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+       if (pid == 0) {
+               pid = (uint16_t)getpid();
+               counter = (uint16_t)(ts.tv_nsec >> 8);
+               rdata.state = NULL;
+               initstate_r((((unsigned)pid) << 16) + ((unsigned)counter),
+                                       state, sizeof state, &rdata);
+       }
+       ts.tv_nsec ^= (long)ts.tv_sec;
+       if (++counter == 0)
+               counter = 1;
+
+       uuid[0] = (char)(ts.tv_nsec >> 24);
+       uuid[1] = (char)(ts.tv_nsec >> 16);
+       uuid[2] = (char)(ts.tv_nsec >> 8);
+       uuid[3] = (char)(ts.tv_nsec);
+
+       uuid[4] = (char)(pid >> 8);
+       uuid[5] = (char)(pid);
+
+       random_r(&rdata, &x);
+       uuid[6] = (char)(((x >> 16) & 0x0f) | 0x40); /* pseudo-random version */
+       uuid[7] = (char)(x >> 8);
+
+       random_r(&rdata, &x);
+       uuid[8] = (char)(((x >> 16) & 0x3f) | 0x80); /* variant RFC4122 */
+       uuid[9] = (char)(x >> 8);
+
+       random_r(&rdata, &x);
+       uuid[10] = (char)(x >> 16);
+       uuid[11] = (char)(x >> 8);
+
+       random_r(&rdata, &x);
+       uuid[12] = (char)(x >> 16);
+       uuid[13] = (char)(x >> 8);
+
+       uuid[14] = (char)(counter >> 8);
+       uuid[15] = (char)(counter);
+#endif
+}
+
+void uuid_new_stringz(uuid_stringz_t uuid)
+{
+       uuid_t newuuid;
+       uuid_new_binary(newuuid);
+       uuid_unparse_lower(newuuid, uuid);
+}