308 lines
8.7 KiB
C
308 lines
8.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* charset conversion utils
|
|
*
|
|
* Copyright (c) 2017 Rob Clark
|
|
*/
|
|
|
|
#ifndef __CHARSET_H_
|
|
#define __CHARSET_H_
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
|
|
#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_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_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);
|
|
|
|
/**
|
|
* 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_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);
|
|
|
|
/**
|
|
* 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 stream to UTF-32
|
|
*
|
|
* @c: next UTF-8 character to convert
|
|
* @buffer: buffer, at least 5 characters
|
|
* Return: next codepage 437 character or 0
|
|
*/
|
|
int utf8_to_utf32_stream(u8 c, char *buffer);
|
|
|
|
#endif /* __CHARSET_H_ */
|