| File: | _build/../src/icu-converter.cc |
| Warning: | line 121, column 9 Value stored to 'target_size' is never read |
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| 1 | /* |
| 2 | * Copyright © 2019 Christian Persch |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 3 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <https://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include "config.h" |
| 19 | |
| 20 | #include "icu-converter.hh" |
| 21 | |
| 22 | #include <cassert> |
| 23 | #include <memory> |
| 24 | |
| 25 | #include <unicode/errorcode.h> |
| 26 | |
| 27 | #include "debug.h" |
| 28 | #include "icu-glue.hh" |
| 29 | |
| 30 | namespace bte::base { |
| 31 | |
| 32 | std::unique_ptr<ICUConverter> |
| 33 | ICUConverter::make(char const* charset, |
| 34 | GError** error) |
| 35 | { |
| 36 | if (bte::base::get_icu_charset_is_ecma35(charset)) |
| 37 | return {}; |
| 38 | |
| 39 | auto charset_converter = bte::base::make_icu_converter(charset, error); |
| 40 | if (!charset_converter) |
| 41 | return {}; |
| 42 | |
| 43 | auto u32_converter = bte::base::make_icu_converter("utf32platformendian", error); |
| 44 | if (!u32_converter) |
| 45 | return {}; |
| 46 | |
| 47 | auto u8_converter = bte::base::make_icu_converter("utf8", error); |
| 48 | if (!u8_converter) |
| 49 | return {}; |
| 50 | |
| 51 | return std::make_unique<ICUConverter>(charset, charset_converter, u32_converter, u8_converter); |
| 52 | } |
| 53 | |
| 54 | std::string |
| 55 | ICUConverter::convert(std::string_view const& data) |
| 56 | { |
| 57 | /* We can't use ucnv_convertEx since that doesn't support preflighting. |
| 58 | * Instead, convert to UTF-16 first, and the to the target, with |
| 59 | * preflighting both times. This is slow, but this is the legacy |
| 60 | * code path, so we don't care. |
| 61 | */ |
| 62 | |
| 63 | if (data.size() == 0) |
| 64 | return {}; |
| 65 | |
| 66 | ucnv_resetToUnicodeucnv_resetToUnicode_72(m_u8_converter.get()); |
| 67 | |
| 68 | auto err = icu::ErrorCode{}; |
| 69 | auto u16_size = ucnv_toUCharsucnv_toUChars_72(m_u8_converter.get(), |
| 70 | nullptr, 0, |
| 71 | data.data(), data.size(), |
| 72 | err); |
| 73 | if (err.isFailure() && (err.get() != U_BUFFER_OVERFLOW_ERROR)) { |
| 74 | _bte_debug_print(BTE_DEBUG_CONVERSION,do { } while(0) |
| 75 | "Error converting from UTF-8 to UTF-16 in preflight: %s\n",do { } while(0) |
| 76 | err.errorName())do { } while(0); |
| 77 | return {}; |
| 78 | } |
| 79 | |
| 80 | auto u16_buffer = std::u16string{}; |
| 81 | if ((size_t)u16_size > u16_buffer.max_size()) // prevent exceptions |
| 82 | return {}; |
| 83 | u16_buffer.resize(u16_size); |
| 84 | |
| 85 | err.reset(); |
| 86 | u16_size = ucnv_toUCharsucnv_toUChars_72(m_u8_converter.get(), |
| 87 | u16_buffer.data(), |
| 88 | u16_buffer.size(), |
| 89 | data.data(), |
| 90 | data.size(), |
| 91 | err); |
| 92 | if (err.isFailure()) { |
| 93 | _bte_debug_print(BTE_DEBUG_CONVERSION,do { } while(0) |
| 94 | "Error converting from UTF-8 to UTF-16: %s\n",do { } while(0) |
| 95 | err.errorName())do { } while(0); |
| 96 | return {}; |
| 97 | } |
| 98 | |
| 99 | /* Now convert to target */ |
| 100 | ucnv_resetFromUnicodeucnv_resetFromUnicode_72(m_charset_converter.get()); |
| 101 | err.reset(); |
| 102 | auto target_size = ucnv_fromUCharsucnv_fromUChars_72(m_charset_converter.get(), |
| 103 | nullptr, 0, |
| 104 | u16_buffer.data(), |
| 105 | u16_size, |
| 106 | err); |
| 107 | if (err.isFailure() && (err.get() != U_BUFFER_OVERFLOW_ERROR)) { |
| 108 | _bte_debug_print(BTE_DEBUG_CONVERSION,do { } while(0) |
| 109 | "Error converting from UTF-8 to %s in preflight: %s\n",do { } while(0) |
| 110 | m_charset.c_str(),do { } while(0) |
| 111 | err.errorName())do { } while(0); |
| 112 | return {}; |
| 113 | } |
| 114 | |
| 115 | auto target_buffer = std::string{}; |
| 116 | if ((size_t)target_size > target_buffer.max_size()) // prevent exceptions |
| 117 | return {}; |
| 118 | target_buffer.resize(target_size); |
| 119 | |
| 120 | err.reset(); |
| 121 | target_size = ucnv_fromUCharsucnv_fromUChars_72(m_charset_converter.get(), |
Value stored to 'target_size' is never read | |
| 122 | target_buffer.data(), |
| 123 | target_buffer.capacity(), |
| 124 | u16_buffer.data(), |
| 125 | u16_size, |
| 126 | err); |
| 127 | if (err.isFailure()) { |
| 128 | _bte_debug_print(BTE_DEBUG_CONVERSION,do { } while(0) |
| 129 | "Error converting from UTF-16 to %s: %s\n",do { } while(0) |
| 130 | m_charset.c_str(),do { } while(0) |
| 131 | err.errorName())do { } while(0); |
| 132 | return {}; |
| 133 | } |
| 134 | |
| 135 | return target_buffer; |
| 136 | } |
| 137 | |
| 138 | } // namespace bte::base |