net/base/net_string_util_icu.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/base/net_string_util.h"
   6
   7 #include "base/i18n/i18n_constants.h"
   8 #include "base/i18n/icu_string_conversions.h"
   9 #include "base/strings/string_util.h"
  10 #include "third_party/icu/source/common/unicode/ucnv.h"
  11
  12 namespace net {
  13
  14 const char* const kCharsetLatin1 = base::kCodepageLatin1;
  15
  16 bool ConvertToUtf8(const std::string& text, const char* charset,
  17                    std::string* output) {
  18   output->clear();
  19
  20   UErrorCode err = U_ZERO_ERROR;
  21   UConverter* converter(ucnv_open(charset, &err));
  22   if (U_FAILURE(err))
  23     return false;
  24
  25   // A single byte in a legacy encoding can be expanded to 3 bytes in UTF-8.
  26   // A 'two-byte character' in a legacy encoding can be expanded to 4 bytes
  27   // in UTF-8. Therefore, the expansion ratio is 3 at most. Add one for a
  28   // trailing '\0'.
  29   size_t output_length = text.length() * 3 + 1;
  30   char* buf = base::WriteInto(output, output_length);
  31   output_length = ucnv_toAlgorithmic(UCNV_UTF8, converter, buf, output_length,
  32                                      text.data(), text.length(), &err);
  33   ucnv_close(converter);
  34   if (U_FAILURE(err)) {
  35     output->clear();
  36     return false;
  37   }
  38
  39   output->resize(output_length);
  40   return true;
  41 }
  42
  43 bool ConvertToUtf8AndNormalize(const std::string& text, const char* charset,
  44                                std::string* output) {
  45   return base::ConvertToUtf8AndNormalize(text,  charset, output);
  46 }
  47
  48 bool ConvertToUTF16(const std::string& text, const char* charset,
  49                     base::string16* output) {
  50   return base::CodepageToUTF16(text, charset,
  51                                base::OnStringConversionError::FAIL, output);
  52 }
  53
  54 bool ConvertToUTF16WithSubstitutions(const std::string& text,
  55                                      const char* charset,
  56                                      base::string16* output) {
  57   return base::CodepageToUTF16(text, charset,
  58                                base::OnStringConversionError::SUBSTITUTE,
  59                                output);
  60 }
  61
  62 }  // namespace net