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utf8.c
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#include "utf8.h"
#include "stdlib.h"
static unsigned int utf8_wstrlen(wchar_t *s){
unsigned int count = 0;
if( s ){
while(*s++) {
++count;
}
}
return count;
}
static unsigned int utf8_strlen(unsigned char *s){
unsigned int count = 0;
if( s ){
while(*s++) {
++count;
}
}
return count;
}
static void utf8_encode_code(unsigned char **buffer, unsigned int code)
{
if( code < 0x80 ){
// 0xxxxxxx
// 8 bits
*(*buffer)++ = code;
} else if( code < 0x800 ){
// 110xxxxx 10xxxxxx
// 2 bits
*(*buffer)++ = ((code>>6) & 0x1f) | 0xc0;
*(*buffer)++ = ( code & 0x3f) | 0x80;
} else if( code < 0x10000 ){
// 1110xxxx 10xxxxxx 10xxxxxx
// 3 bits
*(*buffer)++ = ((code>>12) & 0x0f) | 0xe0;
*(*buffer)++ = ((code>>6 ) & 0x3f) | 0x80;
*(*buffer)++ = ( code & 0x3f) | 0x80;
} else if( code < 0x200000 ){
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
// 4 bits
*(*buffer)++ = ((code>>18) & 0x07) | 0xf0;
*(*buffer)++ = ((code>>12) & 0x3f) | 0x80;
*(*buffer)++ = ((code>>6 ) & 0x3f) | 0x80;
*(*buffer)++ = ( code & 0x3f) | 0x80;
} else if( code < 0x4000000 ){
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 5 bits
*(*buffer)++ = ((code>>24) & 0x03) | 0xf8;
*(*buffer)++ = ((code>>18) & 0x3f) | 0x80;
*(*buffer)++ = ((code>>12) & 0x3f) | 0x80;
*(*buffer)++ = ((code>>6 ) & 0x3f) | 0x80;
*(*buffer)++ = ( code & 0x3f) | 0x80;
} else if( code < 0x80000000 ){
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 6 bits
*(*buffer)++ = ((code>>30) & 0x01) | 0xfc;
*(*buffer)++ = ((code>>24) & 0x3f) | 0x80;
*(*buffer)++ = ((code>>18) & 0x3f) | 0x80;
*(*buffer)++ = ((code>>12) & 0x3f) | 0x80;
*(*buffer)++ = ((code>>6 ) & 0x3f) | 0x80;
*(*buffer)++ = ( code & 0x3f) | 0x80;
}
}
static unsigned int utf8_encode_code_lenght(unsigned int code)
{
if( code < 0x80 ){
// 0xxxxxxx
// 8 bits
return 1;
} else if( code < 0x800 ){
// 110xxxxx 10xxxxxx
// 2 bits
return 2;
} else if( code < 0x10000 ){
// 1110xxxx 10xxxxxx 10xxxxxx
// 3 bits
return 3;
} else if( code < 0x200000 ){
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
// 4 bits
return 4;
} else if( code < 0x4000000 ){
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 5 bits
return 5;
} else if( code < 0x80000000 ){
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 6 bits
return 6;
} else {
// don't handle this code
return 0;
}
}
unsigned char* utf8_encode_string(wchar_t *string, int *length)
{
if( string ){
int len = 0;
if(length){
if(*length < 0){
len = utf8_wstrlen(string);
} else {
len = *length;
}
} else {
len = utf8_wstrlen(string);
}
wchar_t *end = string + len;
wchar_t *s = string;
unsigned int buffer_length = 0;
while( s<end ){
buffer_length += utf8_encode_code_lenght(*s);
++s;
}
unsigned char *buffer = NULL;
if( buffer_length ){
buffer = malloc(sizeof(unsigned char)*buffer_length + 1);
}
if( buffer ){
unsigned char *tmp_buffer = buffer;
s = string;
while( *s ){
utf8_encode_code(&tmp_buffer, *s);
++s;
}
*tmp_buffer = 0;
if( length ){
*length = buffer_length;
}
return buffer;
}
}
if( length ){
*length = 0;
}
return NULL;
}
static unsigned int utf8_decode_character_count(unsigned char *string, int length)
{
unsigned char *n = string;
unsigned int count = 0;
if( length < 0 ){
length = utf8_strlen(string);
}
unsigned char *end = string + length;
while( n<end ){
if(n[0]<0x80){
// 0xxxxxxx
// 1 bits
++n;
} else if(n[0]<0xe0){
// 110xxxxx 10xxxxxx
// 2 bits
if((n[0]&0xe0)==0xc0 &&
(n[1]&0xc0)==0x80 )
{
n += 2;
} else {
break;
}
} else if(n[0]<0xf0){
// 1110xxxx 10xxxxxx 10xxxxxx
// 3 bits
if((n[0]&0xf0)==0xe0 &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 )
{
n += 3;
} else {
break;
}
} else if(n[0]<0xf8){
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
// 4 bits
if((n[0]&0xf8)==0xf0 &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 &&
(n[3]&0xc0)==0x80 )
{
n += 4;
} else {
break;
}
} else if(n[0]<0xfc){
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 5 bits
if((n[0]&0xfc)==0xf8 &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 &&
(n[3]&0xc0)==0x80 &&
(n[4]&0xc0)==0x80 )
{
n += 5;
} else {
break;
}
} else if(n[0]<0xfe){
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 6 bits
if((n[0]&0xfe)==0xfc &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 &&
(n[3]&0xc0)==0x80 &&
(n[4]&0xc0)==0x80 &&
(n[5]&0xc0)==0x80 )
{
n += 5;
} else {
break;
}
} else {
break;
}
++count;
}
return count;
}
wchar_t* utf8_decode_string(unsigned char *string, int *length)
{
if(string){
int len = 0;
if( length ){
if( *length < 0 ){
len = utf8_strlen(string);
} else {
len = *length;
}
} else {
len = utf8_strlen(string);
}
unsigned int buffer_length = utf8_decode_character_count(string, len);
wchar_t *buffer = NULL;
if(buffer_length){
buffer = malloc((buffer_length + 1)*sizeof(wchar_t));
}
if(buffer){
unsigned char *n = string;
unsigned char *end = string + len;
wchar_t *s = buffer;
while (n<end) {
if(n[0]<0x80 ){
// 0xxxxxxx
// 1 bits
*s = n[0];
++n;
} else if(n[0]<0xe0 ){
// 110xxxxx 10xxxxxx
// 2 bits
if((n[0]&0xe0)==0xc0 &&
(n[1]&0xc0)==0x80 )
{
*s =
((n[0]&0x1f)<<6)|
( n[1]&0x3f );
n += 2;
} else {
break;
}
} else if(n[0]<0xf0 ){
// 1110xxxx 10xxxxxx 10xxxxxx
// 3 bits
if((n[0]&0xf0)==0xe0 &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 )
{
*s =
((n[0]&0x0f)<<12)|
((n[1]&0x3f)<<6 )|
( n[2]&0x3f );
n += 3;
} else {
break;
}
} else if(n[0]<0xf8){
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
// 4 bits
if((n[0]&0xf8)==0xf0 &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 &&
(n[3]&0xc0)==0x80 )
{
*s =
((n[0]&0x07)<<18)|
((n[1]&0x3f)<<12)|
((n[2]&0x3f)<<6 )|
( n[3]&0x3f );
n += 4;
} else {
break;
}
} else if(n[0]<0xfc ){
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 5 bits
if((n[0]&0xfc)==0xf8 &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 &&
(n[3]&0xc0)==0x80 &&
(n[4]&0xc0)==0x80 )
{
*s =
((n[0]&0x03)<<24)|
((n[1]&0x3f)<<18)|
((n[2]&0x3f)<<12)|
((n[3]&0x3f)<<6 )|
( n[4]&0x3f );
n += 5;
} else {
break;
}
} else if(n[0]<0xfe ){
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// 6 bits
if((n[0]&0xfe)==0xfc &&
(n[1]&0xc0)==0x80 &&
(n[2]&0xc0)==0x80 &&
(n[3]&0xc0)==0x80 &&
(n[4]&0xc0)==0x80 &&
(n[5]&0xc0)==0x80 )
{
*s =
( 1 <<30)| // ((n[0]&0x01)<30) |
((n[1]&0x3f)<<24)|
((n[2]&0x3f)<<18)|
((n[3]&0x3f)<<12)|
((n[4]&0x3f)<<6 )|
( n[5]&0x3f );
n += 6;
} else {
break;
}
} else {
break;
}
++s;
}
*s = 0;
if( length ){
*length = buffer_length;
}
return buffer;
}
}
if( length ){
*length = 0;
}
return NULL;
}