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u-boot/lib/efi_loader/efi_unicode_collation.c

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7.7 KiB

// SPDX-License-Identifier: GPL-2.0+
/*
* EFI Unicode collation protocol
*
* Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
*/
#include <common.h>
#include <charset.h>
#include <cp1250.h>
#include <cp437.h>
#include <efi_loader.h>
/* Characters that may not be used in file names */
static const char illegal[] = "<>:\"/\\|?*";
/*
* EDK2 assumes codepage 1250 when creating FAT 8.3 file names.
* Linux defaults to codepage 437 for FAT 8.3 file names.
*/
#if CONFIG_FAT_DEFAULT_CODEPAGE == 1250
/* Unicode code points for code page 1250 characters 0x80 - 0xff */
static const u16 codepage[] = CP1250;
#else
/* Unicode code points for code page 437 characters 0x80 - 0xff */
static const u16 codepage[] = CP437;
#endif
/* GUID of the EFI_UNICODE_COLLATION_PROTOCOL */
const efi_guid_t efi_guid_unicode_collation_protocol =
EFI_UNICODE_COLLATION_PROTOCOL2_GUID;
/**
* efi_stri_coll() - compare utf-16 strings case-insenitively
*
* @this: unicode collation protocol instance
* @s1: first string
* @s2: second string
*
* This function implements the StriColl() service of the
* EFI_UNICODE_COLLATION_PROTOCOL.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* TODO:
* The implementation does not follow the Unicode collation algorithm.
* For ASCII characters it results in the same sort order as EDK2.
* We could use table UNICODE_CAPITALIZATION_TABLE for better results.
*
* Return: 0: s1 == s2, > 0: s1 > s2, < 0: s1 < s2
*/
static efi_intn_t EFIAPI efi_stri_coll(
struct efi_unicode_collation_protocol *this, u16 *s1, u16 *s2)
{
s32 c1, c2;
efi_intn_t ret = 0;
EFI_ENTRY("%p, %ls, %ls", this, s1, s2);
for (; *s1 | *s2; ++s1, ++s2) {
c1 = utf_to_upper(*s1);
c2 = utf_to_upper(*s2);
if (c1 < c2) {
ret = -1;
goto out;
} else if (c1 > c2) {
ret = 1;
goto out;
}
}
out:
EFI_EXIT(EFI_SUCCESS);
return ret;
}
/**
* metai_match() - compare utf-16 string with a pattern string case-insenitively
*
* @s: string to compare
* @p: pattern string
*
* The pattern string may use these:
* - * matches >= 0 characters
* - ? matches 1 character
* - [<char1><char2>...<charN>] match any character in the set
* - [<char1>-<char2>] matches any character in the range
*
* This function is called my efi_metai_match().
*
* For '*' pattern searches this function calls itself recursively.
* Performance-wise this is suboptimal, especially for multiple '*' wildcards.
* But it results in simple code.
*
* Return: true if the string is matched.
*/
static bool metai_match(const u16 *s, const u16 *p)
{
u16 first;
for (; *s && *p; ++s, ++p) {
switch (*p) {
case '*':
/* Match 0 or more characters */
++p;
for (;; ++s) {
if (metai_match(s, p))
return true;
if (!*s)
return false;
}
case '?':
/* Match any one character */
break;
case '[':
/* Match any character in the set */
++p;
first = *p;
if (first == ']')
/* Empty set */
return false;
++p;
if (*p == '-') {
/* Range */
++p;
if (*s < first || *s > *p)
return false;
++p;
if (*p != ']')
return false;
} else {
/* Set */
bool hit = false;
if (*s == first)
hit = true;
for (; *p && *p != ']'; ++p) {
if (*p == *s)
hit = true;
}
if (!hit || *p != ']')
return false;
}
break;
default:
/* Match one character */
if (*p != *s)
return false;
}
}
if (!*p && !*s)
return true;
return false;
}
/**
* efi_metai_match() - compare utf-16 string with a pattern string
* case-insenitively
*
* @this: unicode collation protocol instance
* @s: string to compare
* @p: pattern string
*
* The pattern string may use these:
* - * matches >= 0 characters
* - ? matches 1 character
* - [<char1><char2>...<charN>] match any character in the set
* - [<char1>-<char2>] matches any character in the range
*
* This function implements the MetaMatch() service of the
* EFI_UNICODE_COLLATION_PROTOCOL.
*
* Return: true if the string is matched.
*/
static bool EFIAPI efi_metai_match(struct efi_unicode_collation_protocol *this,
const u16 *string, const u16 *pattern)
{
bool ret;
EFI_ENTRY("%p, %ls, %ls", this, string, pattern);
ret = metai_match(string, pattern);
EFI_EXIT(EFI_SUCCESS);
return ret;
}
/**
* efi_str_lwr() - convert to lower case
*
* @this: unicode collation protocol instance
* @string: string to convert
* @p: pattern string
*
* The conversion is done in place. As long as upper and lower letters use the
* same number of words this does not pose a problem.
*
* This function implements the StrLwr() service of the
* EFI_UNICODE_COLLATION_PROTOCOL.
*/
static void EFIAPI efi_str_lwr(struct efi_unicode_collation_protocol *this,
u16 *string)
{
EFI_ENTRY("%p, %ls", this, string);
for (; *string; ++string)
*string = utf_to_lower(*string);
EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_str_upr() - convert to upper case
*
* @this: unicode collation protocol instance
* @string: string to convert
* @p: pattern string
*
* The conversion is done in place. As long as upper and lower letters use the
* same number of words this does not pose a problem.
*
* This function implements the StrUpr() service of the
* EFI_UNICODE_COLLATION_PROTOCOL.
*/
static void EFIAPI efi_str_upr(struct efi_unicode_collation_protocol *this,
u16 *string)
{
EFI_ENTRY("%p, %ls", this, string);
for (; *string; ++string)
*string = utf_to_upper(*string);
EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_fat_to_str() - convert an 8.3 file name from an OEM codepage to Unicode
*
* @this: unicode collation protocol instance
* @fat_size: size of the string to convert
* @fat: string to convert
* @string: converted string
*
* This function implements the FatToStr() service of the
* EFI_UNICODE_COLLATION_PROTOCOL.
*/
static void EFIAPI efi_fat_to_str(struct efi_unicode_collation_protocol *this,
efi_uintn_t fat_size, char *fat, u16 *string)
{
efi_uintn_t i;
u16 c;
EFI_ENTRY("%p, %zu, %s, %p", this, fat_size, fat, string);
for (i = 0; i < fat_size; ++i) {
c = (unsigned char)fat[i];
if (c > 0x80)
c = codepage[i - 0x80];
string[i] = c;
if (!c)
break;
}
string[i] = 0;
EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_fat_to_str() - convert a utf-16 string to legal characters for a FAT
* file name in an OEM code page
*
* @this: unicode collation protocol instance
* @string: Unicode string to convert
* @fat_size: size of the target buffer
* @fat: converted string
*
* This function implements the StrToFat() service of the
* EFI_UNICODE_COLLATION_PROTOCOL.
*
* Return: true if an illegal character was substituted by '_'.
*/
static bool EFIAPI efi_str_to_fat(struct efi_unicode_collation_protocol *this,
const u16 *string, efi_uintn_t fat_size,
char *fat)
{
efi_uintn_t i;
s32 c;
bool ret = false;
EFI_ENTRY("%p, %ls, %zu, %p", this, string, fat_size, fat);
for (i = 0; i < fat_size;) {
c = utf16_get(&string);
switch (c) {
/* Ignore period and space */
case '.':
case ' ':
continue;
case 0:
break;
}
c = utf_to_upper(c);
if (c >= 0x80) {
int j;
/* Look for codepage translation */
for (j = 0; j < 0x80; ++j) {
if (c == codepage[j]) {
c = j + 0x80;
break;
}
}
if (j >= 0x80) {
c = '_';
ret = true;
}
} else if (c && (c < 0x20 || strchr(illegal, c))) {
c = '_';
ret = true;
}
fat[i] = c;
if (!c)
break;
++i;
}
EFI_EXIT(EFI_SUCCESS);
return ret;
}
const struct efi_unicode_collation_protocol efi_unicode_collation_protocol = {
.stri_coll = efi_stri_coll,
.metai_match = efi_metai_match,
.str_lwr = efi_str_lwr,
.str_upr = efi_str_upr,
.fat_to_str = efi_fat_to_str,
.str_to_fat = efi_str_to_fat,
.supported_languages = "en",
};