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kolibrios/kernel/trunk/encoding.inc
CleverMouse b1b43099ea add forgotten include
git-svn-id: svn://kolibrios.org@3540 a494cfbc-eb01-0410-851d-a64ba20cac60
2013-05-27 22:19:11 +00:00

150 lines
3.3 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
}
; 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
}
; 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
}