net_string_util_icu.cc revision 5c02ac1a9c1b504631c0a3d2b6e737b5d738bae1 
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
12namespace net {
13
14bool ConvertToUtf8(const std::string& text, const char* charset,
15                   std::string* output) {
16  output->clear();
17
18  UErrorCode err = U_ZERO_ERROR;
19  UConverter* converter(ucnv_open(charset, &err));
20  if (U_FAILURE(err))
21    return false;
22
23  // A single byte in a legacy encoding can be expanded to 3 bytes in UTF-8.
24  // A 'two-byte character' in a legacy encoding can be expanded to 4 bytes
25  // in UTF-8. Therefore, the expansion ratio is 3 at most. Add one for a
26  // trailing '\0'.
27  size_t output_length = text.length() * 3 + 1;
28  char* buf = WriteInto(output, output_length);
29  output_length = ucnv_toAlgorithmic(UCNV_UTF8, converter, buf, output_length,
30                                     text.data(), text.length(), &err);
31  ucnv_close(converter);
32  if (U_FAILURE(err)) {
33    output->clear();
34    return false;
35  }
36
37  output->resize(output_length);
38  return true;
39}
40
41bool ConvertToUtf8AndNormalize(const std::string& text, const char* charset,
42                               std::string* output) {
43  return base::ConvertToUtf8AndNormalize(text,  charset, output);
44}
45
46bool ConvertLatin1ToUtf8AndNormalize(const std::string& text,
47                                    std::string* output) {
48  return net::ConvertToUtf8AndNormalize(text,  base::kCodepageLatin1, output);
49}
50
51bool ConvertToUTF16(const std::string& text, const char* charset,
52                    base::string16* output) {
53  return base::CodepageToUTF16(text, charset,
54                               base::OnStringConversionError::FAIL, output);
55}
56
57bool ConvertLatin1ToUTF16(const std::string& text, base::string16* output) {
58  return base::CodepageToUTF16(text, base::kCodepageLatin1,
59                               base::OnStringConversionError::FAIL, output);
60}
61
62}  // namespace net
63