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 #pragma once 18 19 #include <stddef.h> 20 #include <stdint.h> 21 22 23 namespace android { 24 25 constexpr size_t SCRIPT_LENGTH = 4; 26 packLocale(const char * language,const char * region)27constexpr inline uint32_t packLocale(const char* language, const char* region) { 28 const unsigned char* lang = reinterpret_cast<const unsigned char*>(language); 29 const unsigned char* reg = reinterpret_cast<const unsigned char*>(region); 30 return (static_cast<uint32_t>(lang[0]) << 24u) | 31 (static_cast<uint32_t>(lang[1]) << 16u) | 32 (static_cast<uint32_t>(reg[0]) << 8u) | 33 static_cast<uint32_t>(reg[1]); 34 } 35 dropRegion(uint32_t packed_locale)36constexpr inline uint32_t dropRegion(uint32_t packed_locale) { 37 return packed_locale & 0xFFFF0000LU; 38 } 39 hasRegion(uint32_t packed_locale)40constexpr inline bool hasRegion(uint32_t packed_locale) { 41 return (packed_locale & 0x0000FFFFLU) != 0; 42 } 43 packScript(const char * script)44constexpr inline uint32_t packScript(const char* script) { 45 const unsigned char* s = reinterpret_cast<const unsigned char*>(script); 46 return ((static_cast<uint32_t>(s[0]) << 24u) | 47 (static_cast<uint32_t>(s[1]) << 16u) | 48 (static_cast<uint32_t>(s[2]) << 8u) | 49 static_cast<uint32_t>(s[3])); 50 } 51 52 /** 53 * Return nullptr if the key isn't found. The input packed_lang_region can be computed 54 * by android::packLocale. 55 * Note that the returned char* is either nullptr or 4-byte char seqeuence, but isn't 56 * a null-terminated string. 57 */ 58 const char* lookupLikelyScript(uint32_t packed_lang_region); 59 /** 60 * Return false if the key isn't representative. The input lookup key can be computed 61 * by android::packLocale. 62 */ 63 bool isLocaleRepresentative(uint32_t language_and_region, const char* script); 64 65 /** 66 * Return a parent packed key for a given script and child packed key. Return 0 if 67 * no parent is found. 68 */ 69 uint32_t findParentLocalePackedKey(const char* script, uint32_t packed_lang_region); 70 71 uint32_t getMaxAncestorTreeDepth(); 72 73 } // namespace android 74