import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

intl/locale/unix/nsUNIXCharset.cpp

@@ -0,0 +1,185 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <locale.h>
+
+#include "mozilla/ArrayUtils.h"
+
+#include "nsIPlatformCharset.h"
+#include "nsUConvPropertySearch.h"
+#include "nsCOMPtr.h"
+#include "nsReadableUtils.h"
+#include "nsEncoderDecoderUtils.h"
+#if HAVE_GNU_LIBC_VERSION_H
+#include <gnu/libc-version.h>
+#endif
+#ifdef HAVE_NL_TYPES_H
+#include <nl_types.h>
+#endif
+#if HAVE_LANGINFO_CODESET
+#include <langinfo.h>
+#endif
+#include "nsPlatformCharset.h"
+#include "prinit.h"
+#include "nsUnicharUtils.h"
+#include "mozilla/dom/EncodingUtils.h"
+
+using mozilla::dom::EncodingUtils;
+using namespace mozilla;
+
+static const nsUConvProp kUnixCharsets[] = {
+#include "unixcharset.properties.h"
+};
+
+NS_IMPL_ISUPPORTS(nsPlatformCharset, nsIPlatformCharset)
+
+nsPlatformCharset::nsPlatformCharset()
+{
+}
+
+static nsresult
+ConvertLocaleToCharsetUsingDeprecatedConfig(const nsACString& locale,
+                                            nsACString& oResult)
+{
+  if (!(locale.IsEmpty())) {
+    if (NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(kUnixCharsets,
+        ArrayLength(kUnixCharsets), locale, oResult))) {
+      return NS_OK;
+    }
+  }
+  NS_ERROR("unable to convert locale to charset using deprecated config");
+  oResult.AssignLiteral("ISO-8859-1");
+  return NS_SUCCESS_USING_FALLBACK_LOCALE;
+}
+
+nsPlatformCharset::~nsPlatformCharset()
+{
+}
+
+NS_IMETHODIMP 
+nsPlatformCharset::GetCharset(nsPlatformCharsetSel selector, nsACString& oResult)
+{
+  oResult = mCharset; 
+  return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsPlatformCharset::GetDefaultCharsetForLocale(const nsAString& localeName, nsACString &oResult)
+{
+  // 
+  // if this locale is the user's locale then use the charset 
+  // we already determined at initialization
+  // 
+  if (mLocale.Equals(localeName) ||
+    // support the 4.x behavior
+    (mLocale.LowerCaseEqualsLiteral("en_us") && 
+     localeName.LowerCaseEqualsLiteral("c"))) {
+    oResult = mCharset;
+    return NS_OK;
+  }
+
+#if HAVE_LANGINFO_CODESET
+  //
+  // This locale appears to be a different locale from the user's locale. 
+  // To do this we would need to lock the global resource we are currently 
+  // using or use a library that provides multi locale support. 
+  // ICU is a possible example of a multi locale library.
+  //     http://oss.software.ibm.com/icu/
+  //
+  // A more common cause of hitting this warning than the above is that 
+  // Mozilla is launched under an ll_CC.UTF-8 locale. In xpLocale, 
+  // we only store the language and the region (ll-CC) losing 'UTF-8', which
+  // leads |mLocale| to be different from |localeName|. Although we lose
+  // 'UTF-8', we init'd |mCharset| with the value obtained via 
+  // |nl_langinfo(CODESET)| so that we're all right here.
+  // 
+  NS_WARNING("GetDefaultCharsetForLocale: need to add multi locale support");
+#ifdef DEBUG_jungshik
+  printf("localeName=%s mCharset=%s\n", NS_ConvertUTF16toUTF8(localeName).get(),
+         mCharset.get());
+#endif
+  // until we add multi locale support: use the the charset of the user's locale
+  oResult = mCharset;
+  return NS_SUCCESS_USING_FALLBACK_LOCALE;
+#else
+  //
+  // convert from locale to charset
+  // using the deprecated locale to charset mapping 
+  //
+  NS_LossyConvertUTF16toASCII localeStr(localeName);
+  return ConvertLocaleToCharsetUsingDeprecatedConfig(localeStr, oResult);
+#endif
+}
+
+nsresult
+nsPlatformCharset::InitGetCharset(nsACString &oString)
+{
+#if HAVE_LANGINFO_CODESET
+  char* nl_langinfo_codeset = nullptr;
+  nsCString aCharset;
+  nsresult res;
+
+  nl_langinfo_codeset = nl_langinfo(CODESET);
+  NS_ASSERTION(nl_langinfo_codeset, "cannot get nl_langinfo(CODESET)");
+
+  //
+  // see if we can use nl_langinfo(CODESET) directly
+  //
+  if (nl_langinfo_codeset) {
+    aCharset.Assign(nl_langinfo_codeset);
+    res = VerifyCharset(aCharset);
+    if (NS_SUCCEEDED(res)) {
+      oString = aCharset;
+      return res;
+    }
+  }
+
+  NS_ERROR("unable to use nl_langinfo(CODESET)");
+#endif
+
+  //
+  // try falling back on a deprecated (locale based) name
+  //
+  char* locale = setlocale(LC_CTYPE, nullptr);
+  nsAutoCString localeStr;
+  localeStr.Assign(locale);
+  return ConvertLocaleToCharsetUsingDeprecatedConfig(localeStr, oString);
+}
+
+NS_IMETHODIMP 
+nsPlatformCharset::Init()
+{
+  //
+  // remember default locale so we can use the
+  // same charset when asked for the same locale
+  //
+  char* locale = setlocale(LC_CTYPE, nullptr);
+  NS_ASSERTION(locale, "cannot setlocale");
+  if (locale) {
+    CopyASCIItoUTF16(locale, mLocale); 
+  } else {
+    mLocale.AssignLiteral("en_US");
+  }
+
+  // InitGetCharset only returns NS_OK or NS_SUCESS_USING_FALLBACK_LOCALE
+  return InitGetCharset(mCharset);
+}
+
+nsresult
+nsPlatformCharset::VerifyCharset(nsCString &aCharset)
+{
+  // fast path for UTF-8.  Most platform uses UTF-8 as charset now.
+  if (aCharset.EqualsLiteral("UTF-8")) {
+    return NS_OK;
+  }
+
+  nsAutoCString encoding;
+  if (!EncodingUtils::FindEncodingForLabelNoReplacement(aCharset, encoding)) {
+    return NS_ERROR_UCONV_NOCONV;
+  }
+
+  aCharset.Assign(encoding);
+  return NS_OK;
+}