example client

git-svn-id: https://svn.kapsi.fi/jpa/nanopb@958 e3a754e5-d11d-0410-8d38-ebb782a927b9

example/common.c

@@ -0,0 +1,49 @@
+/* Simple binding of nanopb streams to TCP sockets.
+ */
+
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <pb_encode.h>
+#include <pb_decode.h>
+
+#include "common.h"
+
+static bool write_callback(pb_ostream_t *stream, const uint8_t *buf, size_t count)
+{
+    int fd = (int)stream->state;
+    return send(fd, buf, count, 0) == count;
+}
+
+static bool read_callback(pb_istream_t *stream, uint8_t *buf, size_t count)
+{
+    int fd = (int)stream->state;
+    int result;
+    
+    if (buf == NULL)
+    {
+        /* Well, this is a really inefficient way to skip input. */
+        /* It is only used when there are unknown fields. */
+        char dummy;
+        while (count-- && recv(fd, &dummy, 1, 0) == 1);
+        return count == 0;
+    }
+    
+    result = recv(fd, buf, count, MSG_WAITALL);
+    
+    if (result == 0)
+        stream->bytes_left = 0; /* EOF */
+    
+    return result == count;
+}
+
+pb_ostream_t pb_ostream_from_socket(int fd)
+{
+    pb_ostream_t stream = {&write_callback, (void*)fd, SIZE_MAX, 0};
+    return stream;
+}
+
+pb_istream_t pb_istream_from_socket(int fd)
+{
+    pb_istream_t stream = {&read_callback, (void*)fd, SIZE_MAX};
+    return stream;
+}