Add a new incremental parsing API

Change-Id: I6b921766836d58df0281fb23b2add3f62a478e14

webm_parser/tests/var_int_parser_test.cc

@@ -0,0 +1,53 @@
+// 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/var_int_parser.h"
+
+#include "gtest/gtest.h"
+
+#include "test_utils/parser_test.h"
+#include "webm/status.h"
+
+using webm::ParserTest;
+using webm::Status;
+using webm::VarIntParser;
+
+namespace {
+
+class VarIntParserTest : public ParserTest<VarIntParser> {};
+
+TEST_F(VarIntParserTest, NoMarkerBit) {
+  SetReaderData({0x00});
+  ParseAndExpectResult(Status::kInvalidElementValue);
+}
+
+TEST_F(VarIntParserTest, EarlyEndOfFile) {
+  SetReaderData({0x01});
+  ParseAndExpectResult(Status::kEndOfFile);
+}
+
+TEST_F(VarIntParserTest, ValidValue) {
+  SetReaderData({0x80});
+  ParseAndVerify();
+  EXPECT_EQ(0, parser_.value());
+  EXPECT_EQ(1, parser_.encoded_length());
+
+  ResetParser();
+  SetReaderData({0x01, 0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE});
+  ParseAndVerify();
+  EXPECT_EQ(0x123456789ABCDE, parser_.value());
+  EXPECT_EQ(8, parser_.encoded_length());
+}
+
+TEST_F(VarIntParserTest, IncrementalParse) {
+  SetReaderData({0x11, 0x23, 0x45, 0x67});
+  IncrementalParseAndVerify();
+  EXPECT_EQ(0x01234567, parser_.value());
+  EXPECT_EQ(4, parser_.encoded_length());
+}
+
+}  // namespace