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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * charset conversion utils
- *
- * Copyright (c) 2017 Rob Clark
- */
- #ifndef __CHARSET_H_
- #define __CHARSET_H_
- #include <linux/types.h>
- #define MAX_UTF8_PER_UTF16 3
- /**
- * utf16_strlen() - Get the length of an utf16 string
- *
- * Returns the number of 16 bit characters in an utf16 string, not
- * including the terminating NULL character.
- *
- * @in the string to measure
- * @return the string length
- */
- size_t utf16_strlen(const uint16_t *in);
- /**
- * utf16_strnlen() - Get the length of a fixed-size utf16 string.
- *
- * Returns the number of 16 bit characters in an utf16 string,
- * not including the terminating NULL character, but at most
- * 'count' number of characters. In doing this, utf16_strnlen()
- * looks at only the first 'count' characters.
- *
- * @in the string to measure
- * @count the maximum number of characters to count
- * @return the string length, up to a maximum of 'count'
- */
- size_t utf16_strnlen(const uint16_t *in, size_t count);
- /**
- * utf16_strcpy() - UTF16 equivalent of strcpy()
- */
- uint16_t *utf16_strcpy(uint16_t *dest, const uint16_t *src);
- /**
- * utf16_strdup() - UTF16 equivalent of strdup()
- */
- uint16_t *utf16_strdup(const uint16_t *s);
- /**
- * utf16_to_utf8() - Convert an utf16 string to utf8
- *
- * Converts 'size' characters of the utf16 string 'src' to utf8
- * written to the 'dest' buffer.
- *
- * NOTE that a single utf16 character can generate up to 3 utf8
- * characters. See MAX_UTF8_PER_UTF16.
- *
- * @dest the destination buffer to write the utf8 characters
- * @src the source utf16 string
- * @size the number of utf16 characters to convert
- * @return the pointer to the first unwritten byte in 'dest'
- */
- uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size);
- /**
- * utf8_to_utf16() - Convert an utf8 string to utf16
- *
- * Converts up to 'size' characters of the utf16 string 'src' to utf8
- * written to the 'dest' buffer. Stops at 0x00.
- *
- * @dest the destination buffer to write the utf8 characters
- * @src the source utf16 string
- * @size maximum number of utf16 characters to convert
- * @return the pointer to the first unwritten byte in 'dest'
- */
- uint16_t *utf8_to_utf16(uint16_t *dest, const uint8_t *src, size_t size);
- #endif /* __CHARSET_H_ */
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