strdup16to8.c revision dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0
1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* libs/cutils/strdup16to8.c 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Copyright 2006, The Android Open Source Project 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License"); 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** you may not use this file except in compliance with the License. 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** You may obtain a copy of the License at 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** http://www.apache.org/licenses/LICENSE-2.0 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Unless required by applicable law or agreed to in writing, software 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** distributed under the License is distributed on an "AS IS" BASIS, 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** See the License for the specific language governing permissions and 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** limitations under the License. 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project*/ 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <cutils/jstring.h> 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <assert.h> 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdlib.h> 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/** 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Given a UTF-16 string, compute the length of the corresponding UTF-8 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * string in bytes. 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectextern size_t strnlen16to8(const char16_t* utf16Str, size_t len) 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project size_t utf8Len = 0; 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while (len--) { 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project unsigned int uic = *utf16Str++; 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (uic > 0x07ff) 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project utf8Len += 3; 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project else if (uic > 0x7f || uic == 0) 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project utf8Len += 2; 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project else 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project utf8Len++; 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return utf8Len; 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/** 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Convert a Java-Style UTF-16 string + length to a JNI-Style UTF-8 string. 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * This basically means: embedded \0's in the UTF-16 string are encoded 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * as "0xc0 0x80" 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Make sure you allocate "utf8Str" with the result of strlen16to8() + 1, 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * not just "len". 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Please note, a terminated \0 is always added, so your result will always 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * be "strlen16to8() + 1" bytes long. 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectextern char* strncpy16to8(char* utf8Str, const char16_t* utf16Str, size_t len) 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char* utf8cur = utf8Str; 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while (len--) { 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project unsigned int uic = *utf16Str++; 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (uic > 0x07ff) { 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project *utf8cur++ = (uic >> 12) | 0xe0; 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project *utf8cur++ = ((uic >> 6) & 0x3f) | 0x80; 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project *utf8cur++ = (uic & 0x3f) | 0x80; 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } else if (uic > 0x7f || uic == 0) { 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project *utf8cur++ = (uic >> 6) | 0xc0; 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project *utf8cur++ = (uic & 0x3f) | 0x80; 71dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } else { 72dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project *utf8cur++ = uic; 73dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 74dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (uic == 0) { 75dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project break; 76dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 77dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 78dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 79dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 80dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project *utf8cur = '\0'; 81dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 82dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return utf8Str; 83dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 84dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 85dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/** 86dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Convert a UTF-16 string to UTF-8. 87dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 88dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Make sure you allocate "dest" with the result of strblen16to8(), 89dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * not just "strlen16()". 90dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 91dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectchar * strndup16to8 (const char16_t* s, size_t n) 92dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 93dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char *ret; 94dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 95dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (s == NULL) { 96dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return NULL; 97dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 98dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 99dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project ret = malloc(strnlen16to8(s, n) + 1); 100dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 101dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project strncpy16to8 (ret, s, n); 102dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 103dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return ret; 104dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 105