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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#include "mf_encoding.h"
#ifndef MF_NO_COMPILE
#if MF_ENCODING == MF_ENCODING_UTF8
mf_char mf_getchar(mf_str *str)
{
uint8_t c;
uint8_t tmp, seqlen;
uint16_t result;
c = **str;
if (!c)
return 0;
(*str)++;
if ((c & 0x80) == 0)
{
/* Just normal ASCII character. */
return c;
}
else if ((c & 0xC0) == 0x80)
{
/* Dangling piece of corrupted multibyte sequence.
* Did you cut the string in the wrong place?
*/
return c;
}
else if ((**str & 0xC0) == 0xC0)
{
/* Start of multibyte sequence without any following bytes.
* Silly. Maybe you are using the wrong encoding.
*/
return c;
}
else
{
/* Beginning of a multi-byte sequence.
* Find out how many characters and combine them.
*/
seqlen = 2;
tmp = 0x20;
result = 0;
while ((c & tmp) && (seqlen < 5))
{
seqlen++;
tmp >>= 1;
result = (result << 6) | (**str & 0x3F);
(*str)++;
}
result = (result << 6) | (**str & 0x3F);
(*str)++;
result |= (c & (tmp - 1)) << ((seqlen - 1) * 6);
return result;
}
}
void mf_rewind(mf_str *str)
{
(*str)--;
while ((**str & 0x80) != 0x00 && (**str & 0xC0) != 0xC0)
(*str)--;
}
#else
mf_char mf_getchar(mf_str *str)
{
if (!(**str))
return 0;
else
return *(*str)++;
}
void mf_rewind(mf_str *str)
{
(*str)--;
}
#endif
#endif //MF_NO_COMPILE
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