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 <string>
13
14#include "base/base_export.h"
15#include "base/basictypes.h"
16#include "base/strings/string16.h"
17#include "base/strings/string_piece.h"
18
19#if defined(OS_MACOSX)
20#include <CoreFoundation/CoreFoundation.h>
21#ifdef __OBJC__
22@class NSString;
23#else
24class NSString;
25#endif
26#endif  // OS_MACOSX
27
28namespace base {
29
30// Converts between wide and UTF-8 representations of a string. On error, the
31// result is system-dependent.
32BASE_EXPORT std::string SysWideToUTF8(const std::wstring& wide);
33BASE_EXPORT std::wstring SysUTF8ToWide(const StringPiece& utf8);
34
35// Converts between wide and the system multi-byte representations of a string.
36// DANGER: This will lose information and can change (on Windows, this can
37// change between reboots).
38BASE_EXPORT std::string SysWideToNativeMB(const std::wstring& wide);
39BASE_EXPORT std::wstring SysNativeMBToWide(const StringPiece& native_mb);
40
41// Windows-specific ------------------------------------------------------------
42
43#if defined(OS_WIN)
44
45// Converts between 8-bit and wide strings, using the given code page. The
46// code page identifier is one accepted by the Windows function
47// MultiByteToWideChar().
48BASE_EXPORT std::wstring SysMultiByteToWide(const StringPiece& mb,
49                                            uint32 code_page);
50BASE_EXPORT std::string SysWideToMultiByte(const std::wstring& wide,
51                                           uint32 code_page);
52
53#endif  // defined(OS_WIN)
54
55// Mac-specific ----------------------------------------------------------------
56
57#if defined(OS_MACOSX)
58
59// Converts between STL strings and CFStringRefs/NSStrings.
60
61// Creates a string, and returns it with a refcount of 1. You are responsible
62// for releasing it. Returns NULL on failure.
63BASE_EXPORT CFStringRef SysUTF8ToCFStringRef(const std::string& utf8);
64BASE_EXPORT CFStringRef SysUTF16ToCFStringRef(const string16& utf16);
65
66// Same, but returns an autoreleased NSString.
67BASE_EXPORT NSString* SysUTF8ToNSString(const std::string& utf8);
68BASE_EXPORT NSString* SysUTF16ToNSString(const string16& utf16);
69
70// Converts a CFStringRef to an STL string. Returns an empty string on failure.
71BASE_EXPORT std::string SysCFStringRefToUTF8(CFStringRef ref);
72BASE_EXPORT string16 SysCFStringRefToUTF16(CFStringRef ref);
73
74// Same, but accepts NSString input. Converts nil NSString* to the appropriate
75// string type of length 0.
76BASE_EXPORT std::string SysNSStringToUTF8(NSString* ref);
77BASE_EXPORT string16 SysNSStringToUTF16(NSString* ref);
78
79#endif  // defined(OS_MACOSX)
80
81}  // namespace base
82
83#endif  // BASE_STRINGS_SYS_STRING_CONVERSIONS_H_
84