Move |GetCanonicalEncodingNameByAliasName| to base/i18n

base/i18n/character_encoding.cc

Index: base/i18n/character_encoding.cc
diff --git a/base/i18n/character_encoding.cc b/base/i18n/character_encoding.cc
new file mode 100644
index 0000000000000000000000000000000000000000..596684a56482352a3a623eae8729097886d6f3f9
--- /dev/null
+++ b/base/i18n/character_encoding.cc
@@ -0,0 +1,42 @@
+// 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 "base/i18n/character_encoding.h"
+
+#include "base/macros.h"
+#include "third_party/icu/source/common/unicode/ucnv.h"
+
+namespace base {
+namespace {
+
+// An array of all supported canonical encoding names.
+const char* const kCanonicalEncodingNames[] = {
+    "Big5",         "EUC-JP",       "EUC-KR",       "gb18030",
+    "GBK",          "IBM866",       "ISO-2022-JP",  "ISO-8859-10",
+    "ISO-8859-13",  "ISO-8859-14",  "ISO-8859-15",  "ISO-8859-16",
+    "ISO-8859-2",   "ISO-8859-3",   "ISO-8859-4",   "ISO-8859-5",
+    "ISO-8859-6",   "ISO-8859-7",   "ISO-8859-8",   "ISO-8859-8-I",
+    "KOI8-R",       "KOI8-U",       "macintosh",    "Shift_JIS",
+    "UTF-16LE",     "UTF-8",        "windows-1250", "windows-1251",
+    "windows-1252", "windows-1253", "windows-1254", "windows-1255",
+    "windows-1256", "windows-1257", "windows-1258", "windows-874"};
+
+}  // namespace
+
+std::string GetCanonicalEncodingNameByAliasName(const std::string& alias_name) {

[dcheng, 2016/12/20 19:26:12]

Can this return const char* to avoid constructing a std::string()?

[Jinsuk Kim, 2016/12/20 23:11:54]

Done.

+  for (auto& encoding_name : kCanonicalEncodingNames) {
+    if (alias_name == encoding_name)
+      return alias_name;
+  }
+  const char* standards[3] = {"HTML", "MIME", "IANA"};
+  for (auto& standard : standards) {
+    UErrorCode error_code = U_ZERO_ERROR;
+    const char* canonical_name =
+        ucnv_getStandardName(alias_name.c_str(), standard, &error_code);
+    if (U_SUCCESS(error_code) && canonical_name)
+      return canonical_name;
+  }
+  return std::string();
+}
+}  // namespace base