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