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utf8.h
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			#ifndef UTF8_H
			#define UTF8_H

			#include <stddef.h>
			#include <stdint.h>

			int utf8_sequence_length(unsigned char first_byte);
			int utf8_encode(uint32_t codepoint, char *out);
			uint32_t utf8_decode(const unsigned char buf, size_t len, int seq_len);

			size_t utf8_strlen(const char *str, size_t byte_len);
			size_t utf16_strlen(const char *str, size_t byte_len);

			int utf16_index_to_byte_offset(
			const char *str,
			size_t byte_len,
			size_t utf16_idx,
			size_t *out_char_bytes
			);

			int utf16_range_to_byte_range(
			const char *str,
			size_t byte_len,
			size_t utf16_start,
			size_t utf16_end,
			size_t *byte_start,
			size_t *byte_end
			);

			uint32_t utf16_code_unit_at(const char *str, size_t byte_len, size_t utf16_idx);
			uint32_t utf16_codepoint_at(const char *str, size_t byte_len, size_t utf16_idx);

			#endif