feature: Project builds with integrated SPIT client (however with some exclusions)

components/spit/src/esp/uuid.c

@@ -0,0 +1,84 @@
+#include "uuid.h"
+
+#include <string.h>
+
+#include "esp_system.h"
+#include "esp_random.h"
+
+void uuid_generate(uuid_t out)
+{
+    esp_fill_random(out, sizeof(uuid_t));
+
+    /* uuid version */
+    out[6] = 0x40 | (out[6] & 0xF);
+
+    /* uuid variant */
+    out[8] = (0x80 | out[8]) & ~0x40;
+}
+
+static uint8_t unhex_char(unsigned char s)
+{
+    if (0x30 <= s && s <= 0x39) { /* 0-9 */
+        return s - 0x30;
+    } else if (0x41 <= s && s <= 0x46) { /* A-F */
+        return s - 0x41 + 0xa;
+    } else if (0x61 <= s && s <= 0x69) { /* a-f */
+        return s - 0x61 + 0xa;
+    } else {
+        /* invalid string */
+        return 0xff;
+    }
+}
+
+static int unhex(unsigned char *s, size_t s_len, unsigned char *r)
+{
+    int i;
+
+    for (i = 0; i < s_len; i += 2) {
+        uint8_t h = unhex_char(s[i]);
+        uint8_t l = unhex_char(s[i + 1]);
+        if (0xff == h || 0xff == l) {
+            return -1;
+        }
+        r[i / 2] = (h << 4) | (l & 0xf);
+    }
+
+    return 0;
+}
+
+int uuid_parse(const char *in, uuid_t uu)
+{
+    const char *p = in;
+    uint8_t *op = (uint8_t *)uu;
+
+    if (0 != unhex((unsigned char *)p, 8, op)) {
+        return -1;
+    }
+    p += 8;
+    op += 4;
+
+    for (int i = 0; i < 3; i++) {
+        if ('-' != *p++ || 0 != unhex((unsigned char *)p, 4, op)) {
+            return -1;
+        }
+        p += 4;
+        op += 2;
+    }
+
+    if ('-' != *p++ || 0 != unhex((unsigned char *)p, 12, op)) {
+        return -1;
+    }
+    p += 12;
+    op += 6;
+
+    return 0;
+}
+
+void uuid_unparse(const uuid_t uu, char *out)
+{
+    snprintf(out, UUID_STR_LEN,
+             "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
+             "%02x%02x-%02x%02x%02x%02x%02x%02x",
+             uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7], uu[8], uu[9], uu[10], uu[11],
+             uu[12], uu[13], uu[14], uu[15]);
+}