1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef MEDIAPROVIDER_PDF_JNI_PDFCLIENT_UTF_H_ 18 #define MEDIAPROVIDER_PDF_JNI_PDFCLIENT_UTF_H_ 19 20 #include <string> 21 22 namespace std { 23 // Typedef std::u16string and std::u32string in case they are missing. 24 typedef std::basic_string<char16_t> u16string; 25 typedef std::basic_string<char32_t> u32string; 26 } // namespace std 27 28 namespace pdfClient { 29 30 // Converts a string from UTF-8 to UTF-32. 31 std::u32string Utf8ToUtf32(std::string_view utf8); 32 33 // Converts a C-string from UTF-8 to UTF-32. 34 std::u32string Utf8ToUtf32(const char* utf8); 35 36 // Converts a string from UTF-16 to UTF-8. 37 std::string Utf16ToUtf8(const std::u16string& utf16); 38 39 // Converts an individual unicode codepoint to one or more UTF-8 chars, 40 // and appends them to the output string. 41 void AppendCodepointAsUtf8(const char32_t codepoint, std::string* output); 42 43 // If a C-string is copied directly into a string, it can end up with a trailing 44 // '\0' character. This trims it. 45 void EraseTrailingNulls(std::string* str); 46 47 } // namespace pdfClient 48 49 #endif // MEDIAPROVIDER_PDF_JNI_PDFCLIENT_UTF_H_