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comparison: security/sandbox/chromium/base/strings/utf_string_conversion_utils.cc
security/sandbox/chromium/base/strings/utf_string_conversion_utils.cc
- changeset 2
- 7e26c7da4463
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| -1:000000000000 | 0:9de2a3cfe170 |
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| 1 // Copyright (c) 2009 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 "base/strings/utf_string_conversion_utils.h" | |
| 6 | |
| 7 #include "base/third_party/icu/icu_utf.h" | |
| 8 | |
| 9 namespace base { | |
| 10 | |
| 11 // ReadUnicodeCharacter -------------------------------------------------------- | |
| 12 | |
| 13 bool ReadUnicodeCharacter(const char* src, | |
| 14 int32 src_len, | |
| 15 int32* char_index, | |
| 16 uint32* code_point_out) { | |
| 17 // U8_NEXT expects to be able to use -1 to signal an error, so we must | |
| 18 // use a signed type for code_point. But this function returns false | |
| 19 // on error anyway, so code_point_out is unsigned. | |
| 20 int32 code_point; | |
| 21 CBU8_NEXT(src, *char_index, src_len, code_point); | |
| 22 *code_point_out = static_cast<uint32>(code_point); | |
| 23 | |
| 24 // The ICU macro above moves to the next char, we want to point to the last | |
| 25 // char consumed. | |
| 26 (*char_index)--; | |
| 27 | |
| 28 // Validate the decoded value. | |
| 29 return IsValidCodepoint(code_point); | |
| 30 } | |
| 31 | |
| 32 bool ReadUnicodeCharacter(const char16* src, | |
| 33 int32 src_len, | |
| 34 int32* char_index, | |
| 35 uint32* code_point) { | |
| 36 if (CBU16_IS_SURROGATE(src[*char_index])) { | |
| 37 if (!CBU16_IS_SURROGATE_LEAD(src[*char_index]) || | |
| 38 *char_index + 1 >= src_len || | |
| 39 !CBU16_IS_TRAIL(src[*char_index + 1])) { | |
| 40 // Invalid surrogate pair. | |
| 41 return false; | |
| 42 } | |
| 43 | |
| 44 // Valid surrogate pair. | |
| 45 *code_point = CBU16_GET_SUPPLEMENTARY(src[*char_index], | |
| 46 src[*char_index + 1]); | |
| 47 (*char_index)++; | |
| 48 } else { | |
| 49 // Not a surrogate, just one 16-bit word. | |
| 50 *code_point = src[*char_index]; | |
| 51 } | |
| 52 | |
| 53 return IsValidCodepoint(*code_point); | |
| 54 } | |
| 55 | |
| 56 #if defined(WCHAR_T_IS_UTF32) | |
| 57 bool ReadUnicodeCharacter(const wchar_t* src, | |
| 58 int32 src_len, | |
| 59 int32* char_index, | |
| 60 uint32* code_point) { | |
| 61 // Conversion is easy since the source is 32-bit. | |
| 62 *code_point = src[*char_index]; | |
| 63 | |
| 64 // Validate the value. | |
| 65 return IsValidCodepoint(*code_point); | |
| 66 } | |
| 67 #endif // defined(WCHAR_T_IS_UTF32) | |
| 68 | |
| 69 // WriteUnicodeCharacter ------------------------------------------------------- | |
| 70 | |
| 71 size_t WriteUnicodeCharacter(uint32 code_point, std::string* output) { | |
| 72 if (code_point <= 0x7f) { | |
| 73 // Fast path the common case of one byte. | |
| 74 output->push_back(code_point); | |
| 75 return 1; | |
| 76 } | |
| 77 | |
| 78 | |
| 79 // CBU8_APPEND_UNSAFE can append up to 4 bytes. | |
| 80 size_t char_offset = output->length(); | |
| 81 size_t original_char_offset = char_offset; | |
| 82 output->resize(char_offset + CBU8_MAX_LENGTH); | |
| 83 | |
| 84 CBU8_APPEND_UNSAFE(&(*output)[0], char_offset, code_point); | |
| 85 | |
| 86 // CBU8_APPEND_UNSAFE will advance our pointer past the inserted character, so | |
| 87 // it will represent the new length of the string. | |
| 88 output->resize(char_offset); | |
| 89 return char_offset - original_char_offset; | |
| 90 } | |
| 91 | |
| 92 size_t WriteUnicodeCharacter(uint32 code_point, string16* output) { | |
| 93 if (CBU16_LENGTH(code_point) == 1) { | |
| 94 // Thie code point is in the Basic Multilingual Plane (BMP). | |
| 95 output->push_back(static_cast<char16>(code_point)); | |
| 96 return 1; | |
| 97 } | |
| 98 // Non-BMP characters use a double-character encoding. | |
| 99 size_t char_offset = output->length(); | |
| 100 output->resize(char_offset + CBU16_MAX_LENGTH); | |
| 101 CBU16_APPEND_UNSAFE(&(*output)[0], char_offset, code_point); | |
| 102 return CBU16_MAX_LENGTH; | |
| 103 } | |
| 104 | |
| 105 // Generalized Unicode converter ----------------------------------------------- | |
| 106 | |
| 107 template<typename CHAR> | |
| 108 void PrepareForUTF8Output(const CHAR* src, | |
| 109 size_t src_len, | |
| 110 std::string* output) { | |
| 111 output->clear(); | |
| 112 if (src_len == 0) | |
| 113 return; | |
| 114 if (src[0] < 0x80) { | |
| 115 // Assume that the entire input will be ASCII. | |
| 116 output->reserve(src_len); | |
| 117 } else { | |
| 118 // Assume that the entire input is non-ASCII and will have 3 bytes per char. | |
| 119 output->reserve(src_len * 3); | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 // Instantiate versions we know callers will need. | |
| 124 template void PrepareForUTF8Output(const wchar_t*, size_t, std::string*); | |
| 125 template void PrepareForUTF8Output(const char16*, size_t, std::string*); | |
| 126 | |
| 127 template<typename STRING> | |
| 128 void PrepareForUTF16Or32Output(const char* src, | |
| 129 size_t src_len, | |
| 130 STRING* output) { | |
| 131 output->clear(); | |
| 132 if (src_len == 0) | |
| 133 return; | |
| 134 if (static_cast<unsigned char>(src[0]) < 0x80) { | |
| 135 // Assume the input is all ASCII, which means 1:1 correspondence. | |
| 136 output->reserve(src_len); | |
| 137 } else { | |
| 138 // Otherwise assume that the UTF-8 sequences will have 2 bytes for each | |
| 139 // character. | |
| 140 output->reserve(src_len / 2); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // Instantiate versions we know callers will need. | |
| 145 template void PrepareForUTF16Or32Output(const char*, size_t, std::wstring*); | |
| 146 template void PrepareForUTF16Or32Output(const char*, size_t, string16*); | |
| 147 | |
| 148 } // namespace base |
