Implement "replacement" text encoding.

Source/wtf/text/TextCodecReplacementTest.cpp

Index: Source/wtf/text/TextCodecReplacementTest.cpp
diff --git a/Source/wtf/text/TextCodecReplacementTest.cpp b/Source/wtf/text/TextCodecReplacementTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b95eec8b75249af91136ecaf821e74a59eb3db60
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+++ b/Source/wtf/text/TextCodecReplacementTest.cpp
@@ -0,0 +1,65 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "wtf/text/TextCodecReplacement.h"
+
+#include "wtf/OwnPtr.h"
+#include "wtf/text/CString.h"
+#include "wtf/text/TextCodec.h"
+#include "wtf/text/TextEncoding.h"
+#include "wtf/text/TextEncodingRegistry.h"
+#include "wtf/text/WTFString.h"
+#include <gtest/gtest.h>
+
+namespace WTF {
+
+namespace {
+
+// Just one example, others are listed in the codec implementation.
+const char* replacementAlias = "iso-2022-kr";
+
+TEST(TextCodecReplacement, Aliases)
+{
+    // FIXME: The 'replacement' label itself should not be referenceable by
+    // resources or script - it's a specification convenience - but much of
+    // the wtf/text API asserts that an encoding name is a label for itself.
+    // crbug.com/277037
+
+    EXPECT_TRUE(TextEncoding(replacementAlias).isValid());
+    EXPECT_STREQ("replacement", TextEncoding(replacementAlias).name());
+}
+
+TEST(TextCodecReplacement, DecodesToFFFD)
+{
+    TextEncoding encoding(replacementAlias);
+    OwnPtr<TextCodec> codec(newTextCodec(encoding));
+
+    bool sawError = false;
+    const char testCase[] = "hello world";
+    size_t testCaseSize = sizeof(testCase) - 1;
+
+    const String result = codec->decode(testCase, testCaseSize, DataEOF, false, sawError);
+    EXPECT_TRUE(sawError);
+    ASSERT_EQ(1u, result.length());
+    EXPECT_EQ(0xFFFDU, result[0]);
+}
+
+TEST(TextCodecReplacement, EncodesToUTF8)
+{
+    TextEncoding encoding(replacementAlias);
+    OwnPtr<TextCodec> codec(newTextCodec(encoding));
+
+    // "Kanji" in Chinese characters.
+    const UChar testCase[] = { 0x6F22, 0x5B57 };
+    size_t testCaseSize = WTF_ARRAY_LENGTH(testCase);
+    CString result = codec->encode(testCase, testCaseSize, QuestionMarksForUnencodables);
+
+    EXPECT_STREQ("\xE6\xBC\xA2\xE5\xAD\x97", result.data());
+}
+
+} // namespace
+
+} // namespace WTF