utf8.h
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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