Import of the watch repository from Pebble

third_party/nanopb/tests/msgid/encode_msgid.c

@@ -0,0 +1,90 @@
+/* Encode a message using msgid field as prefix */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pb_encode.h>
+#include "msgid_example.pb.h"
+#include "test_helpers.h"
+
+/* This function writes the message id as a prefix to the message, allowing
+ * the receiving side to identify message type. Here we use uint8_t to store
+ * it, but e.g. varint or some custom header struct would work just as well.
+ */
+bool write_prefix(pb_ostream_t *stream, int msgid)
+{
+    uint8_t prefix = msgid;
+    return pb_write(stream, &prefix, 1);
+}
+
+/* The main logic will call one of these functions.
+ * Normally which function you call would be selected based on what message
+ * you want to send, here it is decided based on command line parameter.
+ */
+
+bool encode_MyMessage1(pb_ostream_t *stream)
+{
+    MyMessage1 msg = MyMessage1_init_default;
+    msg.intvalue = 1234;
+    return write_prefix(stream, MyMessage1_msgid)
+           && pb_encode(stream, MyMessage1_fields, &msg);
+}
+
+bool encode_MyMessage2(pb_ostream_t *stream)
+{
+    MyMessage2 msg = MyMessage2_init_default;
+    msg.intvalue = 9999;
+    strcpy(msg.strvalue, "Msg2");
+    return write_prefix(stream, MyMessage2_msgid)
+           && pb_encode(stream, MyMessage2_fields, &msg);
+}
+
+bool encode_MyMessage3(pb_ostream_t *stream)
+{
+    MyMessage3 msg = MyMessage3_init_default;
+    msg.boolvalue = true;
+    return write_prefix(stream, MyMessage3_msgid)
+           && pb_encode(stream, MyMessage3_fields, &msg);
+}
+
+int main(int argc, char **argv)
+{
+    uint8_t buffer[128];
+    pb_ostream_t stream;
+    bool status = false;
+    int option;
+
+    if (argc != 2)
+    {
+        fprintf(stderr, "Usage: encode_msgid [number]\n");
+        return 1;
+    }
+    option = atoi(argv[1]);
+
+    stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
+
+    if (option == 1)
+    {
+        status = encode_MyMessage1(&stream);
+    }
+    else if (option == 2)
+    {
+        status = encode_MyMessage2(&stream);
+    }
+    else if (option == 3)
+    {
+        status = encode_MyMessage3(&stream);
+    }
+
+    if (status)
+    {
+        SET_BINARY_MODE(stdout);
+        fwrite(buffer, 1, stream.bytes_written, stdout);
+        return 0;
+    }
+    else
+    {
+        fprintf(stderr, "Encoding failed: %s\n", PB_GET_ERROR(&stream));
+        return 1;
+    }
+}