Add a new incremental parsing API

Change-Id: I6b921766836d58df0281fb23b2add3f62a478e14

webm_parser/tests/recursive_parser_test.cc

@@ -0,0 +1,70 @@
+// Copyright (c) 2016 The WebM project authors. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS.  All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+#include "src/recursive_parser.h"
+
+#include <cstdint>
+
+#include "gtest/gtest.h"
+
+#include "src/byte_parser.h"
+#include "src/element_parser.h"
+#include "test_utils/element_parser_test.h"
+#include "webm/element.h"
+#include "webm/status.h"
+
+using webm::Callback;
+using webm::ElementMetadata;
+using webm::ElementParser;
+using webm::ElementParserTest;
+using webm::Reader;
+using webm::RecursiveParser;
+using webm::Status;
+using webm::StringParser;
+
+namespace {
+
+class FailParser : public ElementParser {
+ public:
+  FailParser() { EXPECT_FALSE(true); }
+
+  Status Init(const ElementMetadata& metadata,
+              std::uint64_t max_size) override {
+    return Status(Status::kInvalidElementSize);
+  }
+
+  Status Feed(Callback* callback, Reader* reader,
+              std::uint64_t* num_bytes_read) override {
+    *num_bytes_read = 0;
+    return Status(Status::kInvalidElementSize);
+  }
+
+  int value() const { return 0; }
+
+  int* mutable_value() { return nullptr; }
+};
+
+class RecursiveFailParserTest
+    : public ElementParserTest<RecursiveParser<FailParser>> {};
+
+TEST_F(RecursiveFailParserTest, NoConstruction) {
+  RecursiveParser<FailParser> parser;
+}
+
+class RecursiveStringParserTest
+    : public ElementParserTest<RecursiveParser<StringParser>> {};
+
+TEST_F(RecursiveStringParserTest, ParsesOkay) {
+  ParseAndVerify();
+  EXPECT_EQ("", parser_.value());
+
+  SetReaderData({0x48, 0x69});  // "Hi".
+  ParseAndVerify();
+  EXPECT_EQ("Hi", parser_.value());
+}
+
+}  // namespace