1 files changed, 93 insertions, 0 deletions
diff --git a/tests/callbacks/decode_callbacks.c b/tests/callbacks/decode_callbacks.c
new file mode 100644
index 00000000..b5056923
--- /dev/null
+++ b/tests/callbacks/decode_callbacks.c
@@ -0,0 +1,93 @@
+/* Decoding testcase for callback fields.
+ * Run e.g. ./test_encode_callbacks | ./test_decode_callbacks
+ */
+
+#include <stdio.h>
+#include <pb_decode.h>
+#include "callbacks.pb.h"
+
+bool print_string(pb_istream_t *stream, const pb_field_t *field, void **arg)
+{
+    uint8_t buffer[1024] = {0};
+    
+    /* We could read block-by-block to avoid the large buffer... */
+    if (stream->bytes_left > sizeof(buffer) - 1)
+        return false;
+    
+    if (!pb_read(stream, buffer, stream->bytes_left))
+        return false;
+    
+    /* Print the string, in format comparable with protoc --decode.
+     * Format comes from the arg defined in main().
+     */
+    printf((char*)*arg, buffer);
+    return true;
+}
+
+bool print_int32(pb_istream_t *stream, const pb_field_t *field, void **arg)
+{
+    uint64_t value;
+    if (!pb_decode_varint(stream, &value))
+        return false;
+    
+    printf((char*)*arg, (long)value);
+    return true;
+}
+
+bool print_fixed32(pb_istream_t *stream, const pb_field_t *field, void **arg)
+{
+    uint32_t value;
+    if (!pb_decode_fixed32(stream, &value))
+        return false;
+    
+    printf((char*)*arg, (long)value);
+    return true;
+}
+
+bool print_fixed64(pb_istream_t *stream, const pb_field_t *field, void **arg)
+{
+    uint64_t value;
+    if (!pb_decode_fixed64(stream, &value))
+        return false;
+    
+    printf((char*)*arg, (long long)value);
+    return true;
+}
+
+int main()
+{
+    uint8_t buffer[1024];
+    size_t length = fread(buffer, 1, 1024, stdin);
+    pb_istream_t stream = pb_istream_from_buffer(buffer, length);
+    
+    /* Note: empty initializer list initializes the struct with all-0.
+     * This is recommended so that unused callbacks are set to NULL instead
+     * of crashing at runtime.
+     */
+    TestMessage testmessage = {};
+    
+    testmessage.submsg.stringvalue.funcs.decode = &print_string;
+    testmessage.submsg.stringvalue.arg = "submsg {\n  stringvalue: \"%s\"\n";
+    testmessage.submsg.int32value.funcs.decode = &print_int32;
+    testmessage.submsg.int32value.arg = "  int32value: %ld\n";
+    testmessage.submsg.fixed32value.funcs.decode = &print_fixed32;
+    testmessage.submsg.fixed32value.arg = "  fixed32value: %ld\n";
+    testmessage.submsg.fixed64value.funcs.decode = &print_fixed64;
+    testmessage.submsg.fixed64value.arg = "  fixed64value: %lld\n}\n";
+    
+    testmessage.stringvalue.funcs.decode = &print_string;
+    testmessage.stringvalue.arg = "stringvalue: \"%s\"\n";
+    testmessage.int32value.funcs.decode = &print_int32;
+    testmessage.int32value.arg = "int32value: %ld\n";
+    testmessage.fixed32value.funcs.decode = &print_fixed32;
+    testmessage.fixed32value.arg = "fixed32value: %ld\n";
+    testmessage.fixed64value.funcs.decode = &print_fixed64;
+    testmessage.fixed64value.arg = "fixed64value: %lld\n";
+    testmessage.repeatedstring.funcs.decode = &print_string;
+    testmessage.repeatedstring.arg = "repeatedstring: \"%s\"\n";
+    
+    if (!pb_decode(&stream, TestMessage_fields, &testmessage))
+        return 1;
+    
+    return 0;
+}