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lib/charset: Map Unicode code points to CP437 code points 1-31

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Code page 437 uses code points 1-31 for glyphs instead of control
characters. Map the appropriate Unicode code points to this code points.
Fixes rendering of grub2's menu as EFI application using the
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL on a console with bitmap fonts.

Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
Janne Grunau 2024-03-16 22:50:20 +01:00 • committed by Heinrich Schuchardt
parent 5ea38f95c4
commit ac72d17fd8
5 changed files with 28 additions and 9 deletions
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2
include/charset.h
View file

@ -16,7 +16,7 @@
/*
* codepage_437 - Unicode to codepage 437 translation table
*/
extern const u16 codepage_437[128];
extern const u16 codepage_437[160];
/**
* console_read_unicode() - read Unicode code point from console

12
include/cp1250.h
View file

@ -1,10 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Constant CP1250 contains the Unicode code points for characters 0x80 - 0xff
* of the code page 1250.
* Constant CP1250 contains the Unicode code points for characters 0x00 - 0x1f
* and 0x80 - 0xff of the code page 1250.
*/
#define CP1250 { \
0x0000, 0x0000, 0x0000, 0x0000, \
0x0000, 0x0000, 0x0000, 0x0000, \
0x0000, 0x0000, 0x0000, 0x0000, \
0x0000, 0x0000, 0x0000, 0x0000, \
0x0000, 0x0000, 0x0000, 0x0000, \
0x0000, 0x0000, 0x0000, 0x0000, \
0x0000, 0x0000, 0x0000, 0x0000, \
0x0000, 0x0000, 0x0000, 0x0000, \
0x20ac, 0x0000, 0x201a, 0x0000, \
0x201e, 0x2026, 0x2020, 0x2021, \
0x0000, 0x2030, 0x0160, 0x2039, \

12
include/cp437.h
View file

@ -1,10 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Constant CP437 contains the Unicode code points for characters 0x80 - 0xff
* of the code page 437.
* Constant CP437 contains the Unicode code points for characters 0x00 - 0x1f
* and 0x80 - 0xff of the code page 437.
*/
#define CP437 { \
0x0000, 0x263a, 0x263b, 0x2665, \
0x2666, 0x2663, 0x2660, 0x2022, \
0x25d8, 0x25cb, 0x25d9, 0x2642, \
0x2640, 0x266a, 0x266b, 0x263c, \
0x25ba, 0x25c4, 0x2195, 0x203c, \
0x00b6, 0x00a7, 0x25ac, 0x21a8, \
0x2191, 0x2193, 0x2192, 0x2190, \
0x221f, 0x2194, 0x25b2, 0x25bc, \
0x00c7, 0x00fc, 0x00e9, 0x00e2, \
0x00e4, 0x00e0, 0x00e5, 0x00e7, \
0x00ea, 0x00eb, 0x00e8, 0x00ef, \

9
lib/charset.c
View file

@ -15,7 +15,7 @@
/**
* codepage_437 - Unicode to codepage 437 translation table
*/
const u16 codepage_437[128] = CP437;
const u16 codepage_437[160] = CP437;
static struct capitalization_table capitalization_table[] =
#ifdef CONFIG_EFI_UNICODE_CAPITALIZATION
@ -516,9 +516,12 @@ int utf_to_cp(s32 *c, const u16 *codepage)
int j;
/* Look up codepage translation */
for (j = 0; j < 0x80; ++j) {
for (j = 0; j < 0xA0; ++j) {
if (*c == codepage[j]) {
*c = j + 0x80;
if (j < 0x20)
*c = j;
else
*c = j + 0x60;
return 0;
}
}

2
lib/efi_loader/efi_unicode_collation.c
View file

@ -256,7 +256,7 @@ static void EFIAPI efi_fat_to_str(struct efi_unicode_collation_protocol *this,
for (i = 0; i < fat_size; ++i) {
c = (unsigned char)fat[i];
if (c > 0x80)
c = codepage[c - 0x80];
c = codepage[c - 0x60];
string[i] = c;
if (!c)
break;