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#include <stdlib.h>
#include <string.h>
#include "Utf8.h"
namespace jin
{
namespace graphics
{
/* utf8 byte string to unicode codepoint */
static const char *utf8toCodepoint(const char *p, unsigned *res) {
unsigned x, mask, shift;
switch (*p & 0xf0) {
case 0xf0: mask = 0x07; shift = 18; break;
case 0xe0: mask = 0x0f; shift = 12; break;
case 0xc0:
case 0xd0: mask = 0x1f; shift = 6; break;
default:
*res = *p;
return p + 1;
}
x = (*p & mask) << shift;
do {
if (*(++p) == '\0') {
*res = x;
return p;
}
shift -= 6;
x |= (*p & 0x3f) << shift;
} while (shift);
*res = x;
return p + 1;
}
Utf8::Utf8(const char* raw, unsigned int length)
{
_length = length;
_raw = (char*)calloc(1, length);
memcpy(_raw, raw, length);
}
Utf8::Iterator Utf8::getIterator()
{
return Iterator(*this);
}
Utf8::~Utf8()
{
free(_raw);
_raw = nullptr;
_length = 0;
}
Utf8::Iterator::Iterator(const Utf8& utf8)
: _utf8(utf8)
{
_p = utf8._raw;
}
Codepoint Utf8::Iterator::get()
{
Codepoint c;
_p = utf8toCodepoint(_p, &c);
return c;
}
}
}
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