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e91789e2f6
Provide functions to convert an UTF-8 stream to code page 437 or UTF-32. Add unit tests. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
308 lines
8.7 KiB
C
308 lines
8.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* charset conversion utils
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*
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* Copyright (c) 2017 Rob Clark
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*/
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#ifndef __CHARSET_H_
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#define __CHARSET_H_
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#include <linux/kernel.h>
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#include <linux/types.h>
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#define MAX_UTF8_PER_UTF16 3
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/**
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* codepage_437 - Unicode to codepage 437 translation table
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*/
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extern const u16 codepage_437[128];
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/**
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* console_read_unicode() - read Unicode code point from console
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*
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* @code: pointer to store Unicode code point
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* Return: 0 = success
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*/
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int console_read_unicode(s32 *code);
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/**
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* utf8_get() - get next UTF-8 code point from buffer
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*
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* @src: pointer to current byte, updated to point to next byte
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* Return: code point, or 0 for end of string, or -1 if no legal
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* code point is found. In case of an error src points to
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* the incorrect byte.
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*/
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s32 utf8_get(const char **src);
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/**
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* utf8_put() - write UTF-8 code point to buffer
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*
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* @code: code point
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* @dst: pointer to destination buffer, updated to next position
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* Return: -1 if the input parameters are invalid
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*/
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int utf8_put(s32 code, char **dst);
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/**
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* utf8_utf16_strnlen() - length of a truncated utf-8 string after conversion
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* to utf-16
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*
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* @src: utf-8 string
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* @count: maximum number of code points to convert
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* Return: length in u16 after conversion to utf-16 without the
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* trailing \0. If an invalid UTF-8 sequence is hit one
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* u16 will be reserved for a replacement character.
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*/
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size_t utf8_utf16_strnlen(const char *src, size_t count);
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/**
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* utf8_utf16_strlen() - length of a utf-8 string after conversion to utf-16
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*
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* @a: utf-8 string
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* Return: length in u16 after conversion to utf-16 without the
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* trailing \0. If an invalid UTF-8 sequence is hit one
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* u16 will be reserved for a replacement character.
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*/
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#define utf8_utf16_strlen(a) utf8_utf16_strnlen((a), SIZE_MAX)
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/**
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* utf8_utf16_strncpy() - copy utf-8 string to utf-16 string
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*
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* @dst: destination buffer
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* @src: source buffer
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* @count: maximum number of code points to copy
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* Return: -1 if the input parameters are invalid
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*/
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int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count);
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/**
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* utf8_utf16_strcpy() - copy utf-8 string to utf-16 string
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*
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* @d: destination buffer
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* @s: source buffer
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* Return: -1 if the input parameters are invalid
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*/
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#define utf8_utf16_strcpy(d, s) utf8_utf16_strncpy((d), (s), SIZE_MAX)
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/**
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* utf16_get() - get next UTF-16 code point from buffer
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*
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* @src: pointer to current word, updated to point to next word
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* Return: code point, or 0 for end of string, or -1 if no legal
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* code point is found. In case of an error src points to
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* the incorrect word.
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*/
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s32 utf16_get(const u16 **src);
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/**
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* utf16_put() - write UTF-16 code point to buffer
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*
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* @code: code point
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* @dst: pointer to destination buffer, updated to next position
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* Return: -1 if the input parameters are invalid
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*/
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int utf16_put(s32 code, u16 **dst);
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/**
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* utf16_strnlen() - length of a truncated utf-16 string
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*
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* @src: utf-16 string
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* @count: maximum number of code points to convert
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* Return: length in code points. If an invalid UTF-16 sequence is
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* hit one position will be reserved for a replacement
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* character.
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*/
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size_t utf16_strnlen(const u16 *src, size_t count);
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/**
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* utf16_utf8_strnlen() - length of a truncated utf-16 string after conversion
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* to utf-8
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*
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* @src: utf-16 string
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* @count: maximum number of code points to convert
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* Return: length in bytes after conversion to utf-8 without the
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* trailing \0. If an invalid UTF-16 sequence is hit one
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* byte will be reserved for a replacement character.
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*/
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size_t utf16_utf8_strnlen(const u16 *src, size_t count);
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/**
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* utf16_utf8_strlen() - length of a utf-16 string after conversion to utf-8
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*
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* @a: utf-16 string
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* Return: length in bytes after conversion to utf-8 without the
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* trailing \0. If an invalid UTF-16 sequence is hit one
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* byte will be reserved for a replacement character.
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*/
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#define utf16_utf8_strlen(a) utf16_utf8_strnlen((a), SIZE_MAX)
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/**
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* utf16_utf8_strncpy() - copy utf-16 string to utf-8 string
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*
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* @dst: destination buffer
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* @src: source buffer
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* @count: maximum number of code points to copy
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* Return: -1 if the input parameters are invalid
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*/
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int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count);
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/**
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* utf16_utf8_strcpy() - copy utf-16 string to utf-8 string
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*
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* @d: destination buffer
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* @s: source buffer
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* Return: -1 if the input parameters are invalid
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*/
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#define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX)
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/**
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* utf_to_lower() - convert a Unicode letter to lower case
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*
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* @code: letter to convert
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* Return: lower case letter or unchanged letter
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*/
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s32 utf_to_lower(const s32 code);
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/**
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* utf_to_upper() - convert a Unicode letter to upper case
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*
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* @code: letter to convert
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* Return: upper case letter or unchanged letter
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*/
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s32 utf_to_upper(const s32 code);
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/**
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* u16_strncmp() - compare two u16 string
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*
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* @s1: first string to compare
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* @s2: second string to compare
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* @n: maximum number of u16 to compare
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* Return: 0 if the first n u16 are the same in s1 and s2
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* < 0 if the first different u16 in s1 is less than the
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* corresponding u16 in s2
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* > 0 if the first different u16 in s1 is greater than the
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* corresponding u16 in s2
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*/
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int u16_strncmp(const u16 *s1, const u16 *s2, size_t n);
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/**
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* u16_strcmp() - compare two u16 string
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*
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* @s1: first string to compare
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* @s2: second string to compare
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* Return: 0 if the first n u16 are the same in s1 and s2
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* < 0 if the first different u16 in s1 is less than the
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* corresponding u16 in s2
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* > 0 if the first different u16 in s1 is greater than the
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* corresponding u16 in s2
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*/
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#define u16_strcmp(s1, s2) u16_strncmp((s1), (s2), SIZE_MAX)
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/**
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* u16_strlen - count non-zero words
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*
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* This function matches wsclen() if the -fshort-wchar compiler flag is set.
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* In the EFI context we explicitly need a function handling u16 strings.
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*
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* @in: null terminated u16 string
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* Return: number of non-zero words.
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* This is not the number of utf-16 letters!
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*/
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size_t u16_strlen(const void *in);
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/**
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* u16_strsize() - count size of u16 string in bytes including the null
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* character
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*
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* Counts the number of bytes occupied by a u16 string
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*
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* @in: null terminated u16 string
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* Return: bytes in a u16 string
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*/
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size_t u16_strsize(const void *in);
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/**
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* u16_strnlen() - count non-zero words
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*
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* This function matches wscnlen_s() if the -fshort-wchar compiler flag is set.
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* In the EFI context we explicitly need a function handling u16 strings.
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*
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* @in: null terminated u16 string
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* @count: maximum number of words to count
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* Return: number of non-zero words.
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* This is not the number of utf-16 letters!
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*/
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size_t u16_strnlen(const u16 *in, size_t count);
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/**
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* u16_strcpy() - copy u16 string
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*
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* Copy u16 string pointed to by src, including terminating null word, to
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* the buffer pointed to by dest.
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*
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* @dest: destination buffer
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* @src: source buffer (null terminated)
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* Return: 'dest' address
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*/
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u16 *u16_strcpy(u16 *dest, const u16 *src);
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/**
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* u16_strdup() - duplicate u16 string
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*
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* Copy u16 string pointed to by src, including terminating null word, to a
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* newly allocated buffer.
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*
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* @src: source buffer (null terminated)
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* Return: allocated new buffer on success, NULL on failure
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*/
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u16 *u16_strdup(const void *src);
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/**
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* utf16_to_utf8() - Convert an utf16 string to utf8
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*
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* Converts 'size' characters of the utf16 string 'src' to utf8
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* written to the 'dest' buffer.
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*
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* NOTE that a single utf16 character can generate up to 3 utf8
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* characters. See MAX_UTF8_PER_UTF16.
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*
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* @dest: the destination buffer to write the utf8 characters
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* @src: the source utf16 string
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* @size: the number of utf16 characters to convert
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* Return: the pointer to the first unwritten byte in 'dest'
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*/
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uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size);
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/**
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* utf_to_cp() - translate Unicode code point to 8bit codepage
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*
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* Codepoints that do not exist in the codepage are rendered as question mark.
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*
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* @c: pointer to Unicode code point to be translated
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* @codepage: Unicode to codepage translation table
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* Return: 0 on success, -ENOENT if codepoint cannot be translated
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*/
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int utf_to_cp(s32 *c, const u16 *codepage);
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/**
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* utf8_to_cp437_stream() - convert UTF-8 stream to codepage 437
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*
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* @c: next UTF-8 character to convert
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* @buffer: buffer, at least 5 characters
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* Return: next codepage 437 character or 0
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*/
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int utf8_to_cp437_stream(u8 c, char *buffer);
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/**
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* utf8_to_utf32_stream() - convert UTF-8 stream to UTF-32
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*
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* @c: next UTF-8 character to convert
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* @buffer: buffer, at least 5 characters
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* Return: next codepage 437 character or 0
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*/
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int utf8_to_utf32_stream(u8 c, char *buffer);
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#endif /* __CHARSET_H_ */
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