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comparison: security/sandbox/chromium/base/strings/utf_string_conversion_utils.h
security/sandbox/chromium/base/strings/utf_string_conversion_utils.h
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| 1 // Copyright (c) 2011 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_UTF_STRING_CONVERSION_UTILS_H_ | |
| 6 #define BASE_STRINGS_UTF_STRING_CONVERSION_UTILS_H_ | |
| 7 | |
| 8 // This should only be used by the various UTF string conversion files. | |
| 9 | |
| 10 #include "base/base_export.h" | |
| 11 #include "base/strings/string16.h" | |
| 12 | |
| 13 namespace base { | |
| 14 | |
| 15 inline bool IsValidCodepoint(uint32 code_point) { | |
| 16 // Excludes the surrogate code points ([0xD800, 0xDFFF]) and | |
| 17 // codepoints larger than 0x10FFFF (the highest codepoint allowed). | |
| 18 // Non-characters and unassigned codepoints are allowed. | |
| 19 return code_point < 0xD800u || | |
| 20 (code_point >= 0xE000u && code_point <= 0x10FFFFu); | |
| 21 } | |
| 22 | |
| 23 inline bool IsValidCharacter(uint32 code_point) { | |
| 24 // Excludes non-characters (U+FDD0..U+FDEF, and all codepoints ending in | |
| 25 // 0xFFFE or 0xFFFF) from the set of valid code points. | |
| 26 return code_point < 0xD800u || (code_point >= 0xE000u && | |
| 27 code_point < 0xFDD0u) || (code_point > 0xFDEFu && | |
| 28 code_point <= 0x10FFFFu && (code_point & 0xFFFEu) != 0xFFFEu); | |
| 29 } | |
| 30 | |
| 31 // ReadUnicodeCharacter -------------------------------------------------------- | |
| 32 | |
| 33 // Reads a UTF-8 stream, placing the next code point into the given output | |
| 34 // |*code_point|. |src| represents the entire string to read, and |*char_index| | |
| 35 // is the character offset within the string to start reading at. |*char_index| | |
| 36 // will be updated to index the last character read, such that incrementing it | |
| 37 // (as in a for loop) will take the reader to the next character. | |
| 38 // | |
| 39 // Returns true on success. On false, |*code_point| will be invalid. | |
| 40 BASE_EXPORT bool ReadUnicodeCharacter(const char* src, | |
| 41 int32 src_len, | |
| 42 int32* char_index, | |
| 43 uint32* code_point_out); | |
| 44 | |
| 45 // Reads a UTF-16 character. The usage is the same as the 8-bit version above. | |
| 46 BASE_EXPORT bool ReadUnicodeCharacter(const char16* src, | |
| 47 int32 src_len, | |
| 48 int32* char_index, | |
| 49 uint32* code_point); | |
| 50 | |
| 51 #if defined(WCHAR_T_IS_UTF32) | |
| 52 // Reads UTF-32 character. The usage is the same as the 8-bit version above. | |
| 53 BASE_EXPORT bool ReadUnicodeCharacter(const wchar_t* src, | |
| 54 int32 src_len, | |
| 55 int32* char_index, | |
| 56 uint32* code_point); | |
| 57 #endif // defined(WCHAR_T_IS_UTF32) | |
| 58 | |
| 59 // WriteUnicodeCharacter ------------------------------------------------------- | |
| 60 | |
| 61 // Appends a UTF-8 character to the given 8-bit string. Returns the number of | |
| 62 // bytes written. | |
| 63 // TODO(brettw) Bug 79631: This function should not be exposed. | |
| 64 BASE_EXPORT size_t WriteUnicodeCharacter(uint32 code_point, | |
| 65 std::string* output); | |
| 66 | |
| 67 // Appends the given code point as a UTF-16 character to the given 16-bit | |
| 68 // string. Returns the number of 16-bit values written. | |
| 69 BASE_EXPORT size_t WriteUnicodeCharacter(uint32 code_point, string16* output); | |
| 70 | |
| 71 #if defined(WCHAR_T_IS_UTF32) | |
| 72 // Appends the given UTF-32 character to the given 32-bit string. Returns the | |
| 73 // number of 32-bit values written. | |
| 74 inline size_t WriteUnicodeCharacter(uint32 code_point, std::wstring* output) { | |
| 75 // This is the easy case, just append the character. | |
| 76 output->push_back(code_point); | |
| 77 return 1; | |
| 78 } | |
| 79 #endif // defined(WCHAR_T_IS_UTF32) | |
| 80 | |
| 81 // Generalized Unicode converter ----------------------------------------------- | |
| 82 | |
| 83 // Guesses the length of the output in UTF-8 in bytes, clears that output | |
| 84 // string, and reserves that amount of space. We assume that the input | |
| 85 // character types are unsigned, which will be true for UTF-16 and -32 on our | |
| 86 // systems. | |
| 87 template<typename CHAR> | |
| 88 void PrepareForUTF8Output(const CHAR* src, size_t src_len, std::string* output); | |
| 89 | |
| 90 // Prepares an output buffer (containing either UTF-16 or -32 data) given some | |
| 91 // UTF-8 input that will be converted to it. See PrepareForUTF8Output(). | |
| 92 template<typename STRING> | |
| 93 void PrepareForUTF16Or32Output(const char* src, size_t src_len, STRING* output); | |
| 94 | |
| 95 } // namespace base | |
| 96 | |
| 97 #endif // BASE_STRINGS_UTF_STRING_CONVERSION_UTILS_H_ |
