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#include "utf8.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
unsigned char * asciiToUtf8(unsigned char c) {
static unsigned char utf8[3];
memset(utf8,0,3);
if(c < 128) utf8[0] = c;
else if(c<192) {
utf8[0] = 194;
utf8[1] = c;
}
else {
utf8[0] = 195;
utf8[1] = c-64;
}
return utf8;
}
unsigned char * asciiStrToUtf8Dup(unsigned char * ascii) {
/* utf8 should have at most two char's per ascii char */
int len = strlen(ascii)*2+1;
unsigned char * ret = malloc(len);
unsigned char * cp = ret;
unsigned char * utf8;
memset(ret,0,len);
len = 0;
while(*ascii) {
utf8 = asciiToUtf8(*ascii);
while(*utf8) {
*(cp++) = *(utf8++);
len++;
}
ascii++;
}
return realloc(ret,len+1);
}
unsigned char utf8ToAscii(unsigned char * utf8) {
unsigned char c = 0;
if(utf8[0]<128) return utf8[0];
else if(utf8[0]==195) c+=64;
else if(utf8[0]!=194) return '?';
return c+utf8[1];
}
int validateUtf8Char(unsigned char * utf8Char) {
if(utf8Char[0]<0x80) return 1;
if(utf8Char[0]>=0xC0 && utf8Char[0]<=0xFD) {
int count = 1;
unsigned char t = 1 << 5;
int i;
while(count < 6 && (t & utf8Char[0])) {
t = (t >> 1);
count++;
}
if(count > 5) return 0;
for(i=1;i<=count;i++) {
if(utf8Char[i] < 0x80 || utf8Char[i] > 0xBF) return 0;
}
return count+1;
}
else return 0;
}
int validUtf8String(unsigned char * string) {
int ret;
while(*string) {
ret = validateUtf8Char(string);
if(0==ret) return 0;
string+= ret;
}
return 1;
}
unsigned char * utf8StrToAsciiDup(unsigned char * utf8) {
/* utf8 should have at most two char's per ascii char */
int len = strlen(utf8)+1;
unsigned char * ret = malloc(len);
unsigned char * cp = ret;
int count;
memset(ret,0,len);
len = 0;
while(*utf8) {
count = validateUtf8Char(utf8);
if(!count) {
free(ret);
return NULL;
}
*(cp++) = utf8ToAscii(utf8);
utf8+= count;
len++;
}
return realloc(ret,len+1);
}
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