Initial commit: TXW82x FPV v2.7.0.7-42229 SDK + project sources

2026-07-06 11:30:13 +08:00
commit e76462eeb7
3451 changed files with 1415300 additions and 0 deletions
--- a/sdk/lib/net/mqtt/kawaii/common/random.c
+++ b/sdk/lib/net/mqtt/kawaii/common/random.c
@@ -0,0 +1,77 @@
+/*
+ * @Author       : jiejie
+ * @GitHub       : https://github.com/jiejieTop
+ * @Date         : 2021-02-26 12:00:24
+ * @LastEditors  : jiejie
+ * @LastEditTime : 2022-06-15 19:44:22
+ * @FilePath     : /mqttclient/common/random.c
+ * Copyright (c) 2022 jiejie, All Rights Reserved. Please keep the author information and source code according to the license.
+ */
+
+#include <stdlib.h>
+#include "random.h"
+
+extern int platform_timer_now();
+static unsigned int last_seed = 1;
+
+
+int __attribute__((weak)) platform_timer_now()
+{
+    return 1;
+}
+
+static int do_random(unsigned int seed)
+{
+    srand(seed);
+    return rand();
+}
+
+int random_number(void)
+{
+    unsigned int seed = (unsigned int) platform_timer_now();
+    last_seed += (seed >> ((seed ^ last_seed) % 3));
+    return do_random(last_seed ^ seed);
+}
+
+// random number range interval [min, max)
+int random_number_range(unsigned int min, unsigned int max)
+{
+    return (random_number() % (max - min)) + min;
+}
+
+int random_string(char *buffer, int len)
+{
+    unsigned int i, flag, seed, random;
+
+    if (NULL == buffer)
+        return 0;
+    
+    seed = (unsigned int) random_number();
+    seed += (unsigned int) ((size_t)buffer ^ seed);
+    
+    random = (unsigned int)do_random(seed);
+    
+	for (i = 0; i < len; i++) {
+        random = do_random(seed ^ random);
+		flag = (unsigned int)random % 3;
+		switch (flag) {
+            case 0:
+                buffer[i] = 'A' + do_random(random ^ (i & flag)) % 26;
+                break;
+            case 1:
+                buffer[i] = 'a' + do_random(random ^ (i & flag)) % 26;
+                break;
+            case 2:
+                buffer[i] = '0' + do_random(random ^ (i & flag)) % 10;
+                break;
+            default:
+                buffer[i] = 'x';
+                break;
+		}
+        random += ((0xb433e5c6 ^ random)  << (i & flag));
+	}
+
+    buffer[len] = '\0';
+	return len;
+}
+