Ignore 7-bit encodings

third_party/WebKit/Source/platform/text/TextEncodingDetectorTest.cpp

+// Copyright 2016 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 "platform/text/TextEncodingDetector.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/text/TextEncoding.h"
+
+namespace blink {
+
+TEST(TextResourceDecoderTest, RespectIso2022Jp)
+{
+    // ISO-2022-JP is the only 7-bit encoding defined in WHATWG standard.
+    std::string iso2022jp = " \x1B""$BKL3$F;F|K\\%O%`%U%!%$%?!<%:$,%=%U%H%P%s%/$H$N%W%l!<%*%U$r@)$7!\"";
+    WTF::TextEncoding encoding;
+    bool result = detectTextEncoding(iso2022jp.c_str(), iso2022jp.length(), nullptr, &encoding);
+    EXPECT_TRUE(result);
+    EXPECT_EQ(WTF::TextEncoding("ISO-2022-JP"), encoding);
+}
+
+TEST(TextResourceDecoderTest, Ignore7BitEncoding)
+{
+    // 7-bit encodings except ISO-2022-JP are not supported by WHATWG.
+    // They should be detected as plain text (US-ASCII).
+    std::string hzGb2312 = " ~{\x54\x42\x31\x7D\x37\x22\x55\x39\x35\x3D\x3D\x71~} abc";
+    WTF::TextEncoding encoding;
+    bool result = detectTextEncoding(hzGb2312.c_str(), hzGb2312.length(), nullptr, &encoding);
+    EXPECT_TRUE(result);
+    EXPECT_EQ(WTF::TextEncoding("US-ASCII"), encoding);
+}
+
+} // namespace blink