168 lines
3.6 KiB
C++
168 lines
3.6 KiB
C++
; fetch the UTF-8 character in string+offs to char
|
|
; common part for all encodings: translate pseudographics
|
|
; Pseudographics for the boot screen:
|
|
; 0x2500 -> 0xC4, 0x2502 -> 0xB3, 0x250C -> 0xDA, 0x2510 -> 0xBF,
|
|
; 0x2514 -> 0xC0, 0x2518 -> 0xD9, 0x252C -> 0xC2, 0x2534 -> 0xC1, 0x2551 -> 0xBA
|
|
macro fetch_utf8_char string, offs, char, graph
|
|
{ local first_byte, b
|
|
virtual at 0
|
|
db string
|
|
if offs >= $
|
|
char = -1
|
|
else
|
|
; fetch first byte
|
|
load first_byte byte from offs
|
|
if first_byte < 0x80
|
|
char = first_byte
|
|
offs = offs + 1
|
|
else if first_byte < 0xC0
|
|
.err Invalid UTF-8 string
|
|
else if first_byte < 0xE0
|
|
char = first_byte and 0x1F
|
|
load b byte from offs + 1
|
|
char = (char shl 6) + (b and 0x3F)
|
|
offs = offs + 2
|
|
else if first_byte < 0xF0
|
|
char = first_byte and 0xF
|
|
load b byte from offs + 1
|
|
char = (char shl 6) + (b and 0x3F)
|
|
load b byte from offs + 2
|
|
char = (char shl 6) + (b and 0x3F)
|
|
offs = offs + 3
|
|
else if first_byte < 0xF8
|
|
char = first_byte and 0x7
|
|
load b byte from offs + 1
|
|
char = (char shl 6) + (b and 0x3F)
|
|
load b byte from offs + 2
|
|
char = (char shl 6) + (b and 0x3F)
|
|
load b byte from offs + 3
|
|
char = (char shl 6) + (b and 0x3F)
|
|
offs = offs + 4
|
|
else
|
|
.err Invalid UTF-8 string
|
|
end if
|
|
end if
|
|
end virtual
|
|
if char = 0x2500
|
|
graph = 0xC4
|
|
else if char = 0x2502
|
|
graph = 0xB3
|
|
else if char = 0x250C
|
|
graph = 0xDA
|
|
else if char = 0x2510
|
|
graph = 0xBF
|
|
else if char = 0x2514
|
|
graph = 0xC0
|
|
else if char = 0x2518
|
|
graph = 0xD9
|
|
else if char = 0x252C
|
|
graph = 0xC2
|
|
else if char = 0x2534
|
|
graph = 0xC1
|
|
else if char = 0x2551
|
|
graph = 0xBA
|
|
else
|
|
graph = 0
|
|
end if
|
|
}
|
|
|
|
; Russian: use CP866.
|
|
; 0x00-0x7F - trivial map
|
|
; 0x410-0x43F -> 0x80-0xAF
|
|
; 0x440-0x44F -> 0xE0-0xEF
|
|
; 0x401 -> 0xF0, 0x451 -> 0xF1
|
|
macro cp866 [arg]
|
|
{ local offs, char, graph
|
|
offs = 0
|
|
while 1
|
|
fetch_utf8_char arg, offs, char, graph
|
|
if char = -1
|
|
break
|
|
end if
|
|
if graph
|
|
db graph
|
|
else if char < 0x80
|
|
db char
|
|
else if char = 0x401
|
|
db 0xF0
|
|
else if char = 0x451
|
|
db 0xF1
|
|
else if (char < 0x410) | (char > 0x44F)
|
|
.err Failed to convert to CP866
|
|
else if char < 0x440
|
|
db char - 0x410 + 0x80
|
|
else
|
|
db char - 0x440 + 0xE0
|
|
end if
|
|
end while
|
|
}
|
|
|
|
struc cp866 [arg]
|
|
{
|
|
common
|
|
cp866 arg
|
|
}
|
|
|
|
; Latin-1 encoding
|
|
; 0x00-0xFF - trivial map
|
|
macro latin1 [arg]
|
|
{ local offs, char, graph
|
|
offs = 0
|
|
while 1
|
|
fetch_utf8_char arg, offs, char, graph
|
|
if char = -1
|
|
break
|
|
end if
|
|
if graph
|
|
db graph
|
|
else if char < 0x100
|
|
db char
|
|
else
|
|
.err Failed to convert to Latin-1
|
|
end if
|
|
end while
|
|
}
|
|
|
|
struc latin1 [arg]
|
|
{
|
|
common
|
|
latin1 arg
|
|
}
|
|
|
|
; CP850 encoding
|
|
macro cp850 [arg]
|
|
{ local offs, char, graph
|
|
offs = 0
|
|
while 1
|
|
fetch_utf8_char arg, offs, char, graph
|
|
if char = -1
|
|
break
|
|
end if
|
|
if graph
|
|
db graph
|
|
else if char < 0x80
|
|
db char
|
|
else if char = 0xBF
|
|
db 0xA8
|
|
else if char = 0xE1
|
|
db 0xA0
|
|
else if char = 0xE9
|
|
db 0x82
|
|
else if char = 0xED
|
|
db 0xA1
|
|
else if char = 0xF3
|
|
db 0xA2
|
|
else if char = 0xFA
|
|
db 0xA3
|
|
else
|
|
err Failed to convert to CP850
|
|
end if
|
|
end while
|
|
}
|
|
|
|
struc cp850 [arg]
|
|
{
|
|
common
|
|
cp850 arg
|
|
}
|