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