/* SPDX-License-Identifier: GPL-2.0+ */ /* * charset conversion utils * * Copyright (c) 2017 Rob Clark */ #ifndef __CHARSET_H_ #define __CHARSET_H_ #include #include #define MAX_UTF8_PER_UTF16 3 /* * codepage_437 - Unicode to codepage 437 translation table */ extern const u16 codepage_437[128]; /** * console_read_unicode() - read Unicode code point from console * * @code: pointer to store Unicode code point * Return: 0 = success */ int console_read_unicode(s32 *code); /** * utf8_get() - get next UTF-8 code point from buffer * * @src: pointer to current byte, updated to point to next byte * Return: code point, or 0 for end of string, or -1 if no legal * code point is found. In case of an error src points to * the incorrect byte. */ s32 utf8_get(const char **src); /** * utf8_put() - write UTF-8 code point to buffer * * @code: code point * @dst: pointer to destination buffer, updated to next position * Return: -1 if the input parameters are invalid */ int utf8_put(s32 code, char **dst); /** * utf8_utf16_strnlen() - length of a truncated utf-8 string after conversion * to utf-16 * * @src: utf-8 string * @count: maximum number of code points to convert * Return: length in u16 after conversion to utf-16 without the * trailing \0. If an invalid UTF-8 sequence is hit one * u16 will be reserved for a replacement character. */ size_t utf8_utf16_strnlen(const char *src, size_t count); /** * utf8_utf16_strlen() - length of a utf-8 string after conversion to utf-16 * * @a: utf-8 string * Return: length in u16 after conversion to utf-16 without the * trailing \0. If an invalid UTF-8 sequence is hit one * u16 will be reserved for a replacement character. */ #define utf8_utf16_strlen(a) utf8_utf16_strnlen((a), SIZE_MAX) /** * utf8_utf16_strncpy() - copy utf-8 string to utf-16 string * * @dst: destination buffer * @src: source buffer * @count: maximum number of code points to copy * Return: -1 if the input parameters are invalid */ int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count); /** * utf8_utf16_strcpy() - copy utf-8 string to utf-16 string * * @d: destination buffer * @s: source buffer * Return: -1 if the input parameters are invalid */ #define utf8_utf16_strcpy(d, s) utf8_utf16_strncpy((d), (s), SIZE_MAX) /** * utf16_get() - get next UTF-16 code point from buffer * * @src: pointer to current word, updated to point to next word * Return: code point, or 0 for end of string, or -1 if no legal * code point is found. In case of an error src points to * the incorrect word. */ s32 utf16_get(const u16 **src); /** * utf16_put() - write UTF-16 code point to buffer * * @code: code point * @dst: pointer to destination buffer, updated to next position * Return: -1 if the input parameters are invalid */ int utf16_put(s32 code, u16 **dst); /** * utf16_strnlen() - length of a truncated utf-16 string * * @src: utf-16 string * @count: maximum number of code points to convert * Return: length in code points. If an invalid UTF-16 sequence is * hit one position will be reserved for a replacement * character. */ size_t utf16_strnlen(const u16 *src, size_t count); /** * utf16_utf8_strnlen() - length of a truncated utf-16 string after conversion * to utf-8 * * @src: utf-16 string * @count: maximum number of code points to convert * Return: length in bytes after conversion to utf-8 without the * trailing \0. If an invalid UTF-16 sequence is hit one * byte will be reserved for a replacement character. */ size_t utf16_utf8_strnlen(const u16 *src, size_t count); /** * utf16_utf8_strlen() - length of a utf-16 string after conversion to utf-8 * * @a: utf-16 string * Return: length in bytes after conversion to utf-8 without the * trailing \0. If an invalid UTF-16 sequence is hit one * byte will be reserved for a replacement character. */ #define utf16_utf8_strlen(a) utf16_utf8_strnlen((a), SIZE_MAX) /** * utf16_utf8_strncpy() - copy utf-16 string to utf-8 string * * @dst: destination buffer * @src: source buffer * @count: maximum number of code points to copy * Return: -1 if the input parameters are invalid */ int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count); /** * utf16_utf8_strcpy() - copy utf-16 string to utf-8 string * * @d: destination buffer * @s: source buffer * Return: -1 if the input parameters are invalid */ #define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX) /** * utf_to_lower() - convert a Unicode letter to lower case * * @code: letter to convert * Return: lower case letter or unchanged letter */ s32 utf_to_lower(const s32 code); /** * utf_to_upper() - convert a Unicode letter to upper case * * @code: letter to convert * Return: upper case letter or unchanged letter */ s32 utf_to_upper(const s32 code); /** * u16_strcasecmp() - compare two u16 strings case insensitively * * @s1: first string to compare * @s2: second string to compare * Return: 0 if the first n u16 are the same in s1 and s2 * < 0 if the first different u16 in s1 is less than the * corresponding u16 in s2 * > 0 if the first different u16 in s1 is greater than the */ int u16_strcasecmp(const u16 *s1, const u16 *s2); /** * u16_strncmp() - compare two u16 string * * @s1: first string to compare * @s2: second string to compare * @n: maximum number of u16 to compare * Return: 0 if the first n u16 are the same in s1 and s2 * < 0 if the first different u16 in s1 is less than the * corresponding u16 in s2 * > 0 if the first different u16 in s1 is greater than the * corresponding u16 in s2 */ int u16_strncmp(const u16 *s1, const u16 *s2, size_t n); /** * u16_strcmp() - compare two u16 string * * @s1: first string to compare * @s2: second string to compare * Return: 0 if the first n u16 are the same in s1 and s2 * < 0 if the first different u16 in s1 is less than the * corresponding u16 in s2 * > 0 if the first different u16 in s1 is greater than the * corresponding u16 in s2 */ #define u16_strcmp(s1, s2) u16_strncmp((s1), (s2), SIZE_MAX) /** * u16_strsize() - count size of u16 string in bytes including the null * character * * Counts the number of bytes occupied by a u16 string * * @in: null terminated u16 string * Return: bytes in a u16 string */ size_t u16_strsize(const void *in); /** * u16_strnlen() - count non-zero words * * This function matches wscnlen_s() if the -fshort-wchar compiler flag is set. * In the EFI context we explicitly need a function handling u16 strings. * * @in: null terminated u16 string * @count: maximum number of words to count * Return: number of non-zero words. * This is not the number of utf-16 letters! */ size_t u16_strnlen(const u16 *in, size_t count); /** * u16_strlen - count non-zero words * * This function matches wsclen() if the -fshort-wchar compiler flag is set. * In the EFI context we explicitly need a function handling u16 strings. * * @in: null terminated u16 string * Return: number of non-zero words. * This is not the number of utf-16 letters! */ size_t u16_strlen(const void *in); #define u16_strlen(in) u16_strnlen(in, SIZE_MAX) /** * u16_strcpy() - copy u16 string * * Copy u16 string pointed to by src, including terminating null word, to * the buffer pointed to by dest. * * @dest: destination buffer * @src: source buffer (null terminated) * Return: 'dest' address */ u16 *u16_strcpy(u16 *dest, const u16 *src); /** * u16_strdup() - duplicate u16 string * * Copy u16 string pointed to by src, including terminating null word, to a * newly allocated buffer. * * @src: source buffer (null terminated) * Return: allocated new buffer on success, NULL on failure */ u16 *u16_strdup(const void *src); /** * u16_strlcat() - Append a length-limited, %NUL-terminated string to another * * Append the source string @src to the destination string @dest, overwriting * null word at the end of @dest adding a terminating null word. * * @dest: zero terminated u16 destination string * @src: zero terminated u16 source string * @count: size of buffer in u16 words including taling 0x0000 * Return: required size including trailing 0x0000 in u16 words * If return value >= count, truncation occurred. */ size_t u16_strlcat(u16 *dest, const u16 *src, size_t count); /** * 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); /** * utf_to_cp() - translate Unicode code point to 8bit codepage * * Codepoints that do not exist in the codepage are rendered as question mark. * * @c: pointer to Unicode code point to be translated * @codepage: Unicode to codepage translation table * Return: 0 on success, -ENOENT if codepoint cannot be translated */ int utf_to_cp(s32 *c, const u16 *codepage); /** * utf8_to_cp437_stream() - convert UTF-8 stream to codepage 437 * * @c: next UTF-8 character to convert * @buffer: buffer, at least 5 characters * Return: next codepage 437 character or 0 */ int utf8_to_cp437_stream(u8 c, char *buffer); /** * utf8_to_utf32_stream() - convert UTF-8 byte stream to Unicode code points * * The function is called for each byte @c in a UTF-8 stream. The byte is * appended to the temporary storage @buffer until the UTF-8 stream in * @buffer describes a Unicode code point. * * When a new code point has been decoded it is returned and buffer[0] is * set to '\0', otherwise the return value is 0. * * The buffer must be at least 5 characters long. Before the first function * invocation buffer[0] must be set to '\0'." * * @c: next UTF-8 character to convert * @buffer: buffer, at least 5 characters * Return: Unicode code point or 0 */ int utf8_to_utf32_stream(u8 c, char *buffer); #endif /* __CHARSET_H_ */