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#include <stdlib.h>
#include <string.h>
#include "Decoder.h"
namespace jin
{
namespace graphics
{
/* utf8 byte string to unicode codepoint */
static const char *utf8toCodepoint(const char *p, unsigned *res) {
return nullptr;
}
/////////////////////////////////////////////////////////////////////////////
// decoders
/////////////////////////////////////////////////////////////////////////////
const void* Utf8::decode(const void* data, Codepoint* res) const
{
const char* p = (char*)data;
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;
}
const void* Utf8::next(const void* data) const
{
const char* p = (char*)data;
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:
return p + 1;
}
x = (*p & mask) << shift;
do {
if (*(++p) == '\0') {
return p;
}
shift -= 6;
x |= (*p & 0x3f) << shift;
} while (shift);
return p + 1;
}
/*
const void* Utf16::decode(const void* data, Codepoint* res) const
{
return nullptr;
}
const void* Utf16::next(const void* data) const
{
return nullptr;
}
*/
const void* Ascii::decode(const void* data, Codepoint* res) const
{
const char* p = (char*)data;
*res = *p;
return p + 1;
}
const void* Ascii::next(const void* data) const
{
const char* p = (char*)data;
return p + 1;
}
} // graphics
} // jin
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