Adding upstream version 0.2.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

examples/reader.c

@@ -0,0 +1,65 @@
+#include <dnswire/reader.h>
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include "print_dnstap.c"
+
+int main(int argc, const char* argv[])
+{
+    if (argc < 2) {
+        fprintf(stderr, "usage: reader <file>\n");
+        return 1;
+    }
+
+    /*
+     * First we open the given file and read all of the content.
+     */
+
+    FILE* fp = fopen(argv[1], "r");
+    if (!fp) {
+        fprintf(stderr, "Unable to open %s: %s\n", argv[1], strerror(errno));
+        return 1;
+    }
+
+    /*
+     * We now initialize the reader and check that it can allocate the
+     * buffers it needs.
+     */
+
+    struct dnswire_reader reader;
+    int                   done = 0;
+
+    if (dnswire_reader_init(&reader) != dnswire_ok) {
+        fprintf(stderr, "Unable to initialize dnswire reader\n");
+        return 1;
+    }
+
+    /*
+     * We now loop until we have a DNSTAP message, the stream was stopped
+     * or we got an error.
+     */
+
+    while (!done) {
+        switch (dnswire_reader_fread(&reader, fp)) {
+        case dnswire_have_dnstap:
+            print_dnstap(dnswire_reader_dnstap(reader));
+            break;
+        case dnswire_again:
+        case dnswire_need_more:
+            break;
+        case dnswire_endofdata:
+            done = 1;
+            break;
+        default:
+            fprintf(stderr, "dnswire_reader_fread() error\n");
+            done = 1;
+        }
+    }
+
+    dnswire_reader_destroy(reader);
+    fclose(fp);
+
+    return 0;
+}