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#include <stdint.h>
#define UTF_OK 0
#define UTF_ERR -1
typedef uint8_t utf8_t;
typedef uint16_t utf16_t;
typedef uint32_t utf32_t;
int utf8_enc(utf32_t ch, utf8_t *str);
int utf8_dec(utf8_t *str, utf32_t *ch);
int utf8_len(utf8_t *str);
int utf8_seek(utf8_t *str, int off, utf32_t *ch);
int utf8_verify(utf8_t *str, int str_size, int *str_len);
int utf16_enc(utf32_t ch, uint8_t *str);
int utf16_dec(uint8_t *str, utf32_t *ch);
int utf16_len(uint8_t *str);
int utf16_seek(uint8_t *str, int off, utf32_t *ch);
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