105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
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/* libs/cutils/strdup16to8.c
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**
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** Copyright 2006, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <cutils/jstring.h>
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#include <assert.h>
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#include <stdlib.h>
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/**
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* Given a UTF-16 string, compute the length of the corresponding UTF-8
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* string in bytes.
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*/
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extern size_t strnlen16to8(const char16_t* utf16Str, size_t len)
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{
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size_t utf8Len = 0;
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while (len--) {
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unsigned int uic = *utf16Str++;
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if (uic > 0x07ff)
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utf8Len += 3;
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else if (uic > 0x7f || uic == 0)
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utf8Len += 2;
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else
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utf8Len++;
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}
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return utf8Len;
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}
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/**
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* Convert a Java-Style UTF-16 string + length to a JNI-Style UTF-8 string.
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*
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* This basically means: embedded \0's in the UTF-16 string are encoded
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* as "0xc0 0x80"
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*
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* Make sure you allocate "utf8Str" with the result of strlen16to8() + 1,
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* not just "len".
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*
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* Please note, a terminated \0 is always added, so your result will always
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* be "strlen16to8() + 1" bytes long.
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*/
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extern char* strncpy16to8(char* utf8Str, const char16_t* utf16Str, size_t len)
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{
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char* utf8cur = utf8Str;
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while (len--) {
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unsigned int uic = *utf16Str++;
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if (uic > 0x07ff) {
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*utf8cur++ = (uic >> 12) | 0xe0;
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*utf8cur++ = ((uic >> 6) & 0x3f) | 0x80;
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*utf8cur++ = (uic & 0x3f) | 0x80;
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} else if (uic > 0x7f || uic == 0) {
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*utf8cur++ = (uic >> 6) | 0xc0;
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*utf8cur++ = (uic & 0x3f) | 0x80;
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} else {
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*utf8cur++ = uic;
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if (uic == 0) {
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break;
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}
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}
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}
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*utf8cur = '\0';
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return utf8Str;
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}
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/**
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* Convert a UTF-16 string to UTF-8.
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*
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* Make sure you allocate "dest" with the result of strblen16to8(),
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* not just "strlen16()".
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*/
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char * strndup16to8 (const char16_t* s, size_t n)
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{
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char *ret;
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if (s == NULL) {
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return NULL;
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}
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ret = malloc(strnlen16to8(s, n) + 1);
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strncpy16to8 (ret, s, n);
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return ret;
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}
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