1// Copyright (c) 2012 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#ifndef BASE_STRINGS_SYS_STRING_CONVERSIONS_H_
6#define BASE_STRINGS_SYS_STRING_CONVERSIONS_H_
7
8// Provides system-dependent string type conversions for cases where it's
9// necessary to not use ICU. Generally, you should not need this in Chrome,
10// but it is used in some shared code. Dependencies should be minimal.
11
12#include <stdint.h>
13
14#include <string>
15
16#include "base/base_export.h"
17#include "base/strings/string16.h"
18#include "base/strings/string_piece.h"
19#include "build/build_config.h"
20
21#if defined(OS_MACOSX)
22#include <CoreFoundation/CoreFoundation.h>
23#ifdef __OBJC__
24@class NSString;
25#else
26class NSString;
27#endif
28#endif  // OS_MACOSX
29
30namespace base {
31
32// Converts between wide and UTF-8 representations of a string. On error, the
33// result is system-dependent.
34BASE_EXPORT std::string SysWideToUTF8(const std::wstring& wide);
35BASE_EXPORT std::wstring SysUTF8ToWide(const StringPiece& utf8);
36
37// Converts between wide and the system multi-byte representations of a string.
38// DANGER: This will lose information and can change (on Windows, this can
39// change between reboots).
40BASE_EXPORT std::string SysWideToNativeMB(const std::wstring& wide);
41BASE_EXPORT std::wstring SysNativeMBToWide(const StringPiece& native_mb);
42
43// Windows-specific ------------------------------------------------------------
44
45#if defined(OS_WIN)
46
47// Converts between 8-bit and wide strings, using the given code page. The
48// code page identifier is one accepted by the Windows function
49// MultiByteToWideChar().
50BASE_EXPORT std::wstring SysMultiByteToWide(const StringPiece& mb,
51                                            uint32_t code_page);
52BASE_EXPORT std::string SysWideToMultiByte(const std::wstring& wide,
53                                           uint32_t code_page);
54
55#endif  // defined(OS_WIN)
56
57// Mac-specific ----------------------------------------------------------------
58
59#if defined(OS_MACOSX)
60
61// Converts between STL strings and CFStringRefs/NSStrings.
62
63// Creates a string, and returns it with a refcount of 1. You are responsible
64// for releasing it. Returns NULL on failure.
65BASE_EXPORT CFStringRef SysUTF8ToCFStringRef(const std::string& utf8);
66BASE_EXPORT CFStringRef SysUTF16ToCFStringRef(const string16& utf16);
67
68// Same, but returns an autoreleased NSString.
69BASE_EXPORT NSString* SysUTF8ToNSString(const std::string& utf8);
70BASE_EXPORT NSString* SysUTF16ToNSString(const string16& utf16);
71
72// Converts a CFStringRef to an STL string. Returns an empty string on failure.
73BASE_EXPORT std::string SysCFStringRefToUTF8(CFStringRef ref);
74BASE_EXPORT string16 SysCFStringRefToUTF16(CFStringRef ref);
75
76// Same, but accepts NSString input. Converts nil NSString* to the appropriate
77// string type of length 0.
78BASE_EXPORT std::string SysNSStringToUTF8(NSString* ref);
79BASE_EXPORT string16 SysNSStringToUTF16(NSString* ref);
80
81#endif  // defined(OS_MACOSX)
82
83}  // namespace base
84
85#endif  // BASE_STRINGS_SYS_STRING_CONVERSIONS_H_
86