forked from KolibriOS/kolibrios
220 lines
7.0 KiB
PHP
220 lines
7.0 KiB
PHP
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; ;;
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;; GNU GENERAL PUBLIC LICENSE ;;
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;; Version 2, June 1991 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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get_next_byte:
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; Load next byte from the packet, translating to cp866 if necessary
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; At input esi = pointer to data, edx = limit of data
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; Output is either (translated) byte in al with CF set or CF cleared.
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mov eax, [encoding]
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jmp [get_byte_table+eax*4]
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get_byte_cp866:
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cmp esi, edx
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jae .nothing
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lodsb
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.nothing:
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ret
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get_byte_cp1251:
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cmp esi, edx
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jae .nothing
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lodsb
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cmp al, 0x80
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jb @f
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and eax, 0x7F
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mov al, [cp1251_table+eax]
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@@:
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stc
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.nothing:
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ret
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get_byte_utf8:
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; UTF8 decoding is slightly complicated.
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; One character can occupy one or more bytes.
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; The boundary in packets theoretically can be anywhere in data,
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; so this procedure keeps internal state between calls and handles
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; one byte at a time, looping until character is read or packet is over.
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; Globally, there are two distinct tasks: decode byte sequence to unicode char
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; and convert this unicode char to our base encoding (that is cp866).
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; 1. Check that there are data.
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cmp esi, edx
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jae .nothing
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; 2. Load byte.
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lodsb
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movzx ecx, al
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; 3. Bytes in an UTF8 sequence can be of any of three types.
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; If most significant bit is cleared, sequence is one byte and usual ASCII char.
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; First byte of a sequence must be 11xxxxxx, other bytes are 10yyyyyy.
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and al, 0xC0
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jns .single_byte
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jp .first_byte
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; 4. This byte is not first in UTF8 sequence.
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; 4a. Check that the sequence was started. If no, it is invalid byte
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; and we simply ignore it.
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cmp [utf8_bytes_rest], 0
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jz get_byte_utf8
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; 4b. Otherwise, it is really next byte and it gives some more bits of char.
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mov eax, [utf8_char]
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shl eax, 6
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lea eax, [eax+ecx-0x80]
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; 4c. Decrement number of bytes rest in the sequence.
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; If it goes to zero, character is read, so return it.
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dec [utf8_bytes_rest]
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jz .got_char
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mov [utf8_char], eax
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jmp get_byte_utf8
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; 5. If the byte is first in UTF8 sequence, calculate the number of leading 1s
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; - it equals total number of bytes in the sequence; some other bits rest for
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; leading bits in the character.
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.first_byte:
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mov eax, -1
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@@:
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inc eax
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add cl, cl
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js @b
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mov [utf8_bytes_rest], eax
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xchg eax, ecx
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inc ecx
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shr al, cl
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mov [utf8_char], eax
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jmp get_byte_utf8
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; 6. If the byte is ASCII char, it is the character.
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.single_byte:
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xchg eax, ecx
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.got_char:
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; We got the character, now abandon a possible sequence in progress.
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and [utf8_bytes_rest], 0
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; Now second task. The unicode character is in eax, and now we shall convert it
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; to cp866.
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cmp eax, 0x80
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jb .done
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; 0x410-0x43F -> 0x80-0xAF, 0x440-0x44F -> 0xE0-0xEF, 0x401 -> 0xF0, 0x451 -> 0xF1
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cmp eax, 0x401
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jz .YO
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cmp eax, 0x451
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jz .yo
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cmp eax, 0x410
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jb .unrecognized
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cmp eax, 0x440
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jb .part1
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cmp eax, 0x450
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jae .unrecognized
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sub al, (0x40-0xE0) and 0xFF
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ret
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.part1:
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sub al, 0x10-0x80
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.nothing:
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.done:
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ret
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.unrecognized:
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mov al, '?'
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stc
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ret
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.YO:
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mov al, 0xF0
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stc
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ret
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.yo:
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mov al, 0xF1
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stc
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ret
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recode_to_cp866:
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rep movsb
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ret
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recode_to_cp1251:
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xor eax, eax
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jecxz .nothing
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.loop:
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lodsb
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cmp al,0x80
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jb @f
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mov al, [cp866_table-0x80+eax]
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@@: stosb
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loop .loop
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.nothing:
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ret
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recode_to_utf8:
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jecxz .nothing
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.loop:
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lodsb
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cmp al, 0x80
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jb .single_byte
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and eax, 0x7F
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mov ax, [utf8_table+eax*2]
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stosw
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loop .loop
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ret
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.single_byte:
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stosb
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loop .loop
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.nothing:
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ret
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recode:
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mov eax, [encoding]
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jmp [recode_proc+eax*4]
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encoding dd UTF8
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recode_proc dd recode_to_cp866, recode_to_cp1251, recode_to_utf8
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get_byte_table dd get_byte_cp866, get_byte_cp1251, get_byte_utf8
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cp1251_table:
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db '?','?','?','?','?','?','?','?' , '?','?','?','?','?','?','?','?' ; 8
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db '?','?','?','?','?',$F9,'?','?' , '?','?','?','?','?','?','?','?' ; 9
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db '?',$F6,$F7,'?',$FD,'?','?','?' , $F0,'?',$F2,'?','?','?','?',$F4 ; A
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db $F8,'?','?','?','?','?','?',$FA , $F1,$FC,$F3,'?','?','?','?',$F5 ; B
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db $80,$81,$82,$83,$84,$85,$86,$87 , $88,$89,$8A,$8B,$8C,$8D,$8E,$8F ; C
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db $90,$91,$92,$93,$94,$95,$96,$97 , $98,$99,$9A,$9B,$9C,$9D,$9E,$9F ; D
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db $A0,$A1,$A2,$A3,$A4,$A5,$A6,$A7 , $A8,$A9,$AA,$AB,$AC,$AD,$AE,$AF ; E
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db $E0,$E1,$E2,$E3,$E4,$E5,$E6,$E7 , $E8,$E9,$EA,$EB,$EC,$ED,$EE,$EF ; F
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; 0 1 2 3 4 5 6 7 8 9 A B C D E F
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utf8_table:
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times 80h dw 0x98C3 ; default placeholder
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; 0x80-0xAF -> 0x90D0-0xBFD0
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repeat 0x30
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store byte 0xD0 at utf8_table+2*(%-1)
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store byte 0x90+%-1 at utf8_table+2*%-1
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end repeat
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; 0xE0-0xEF -> 0x80D1-0x8FD1
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repeat 0x10
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store byte 0xD1 at utf8_table+2*(0xE0-0x80+%-1)
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store byte 0x80+%-1 at utf8_table+2*(0xE0-0x80+%)-1
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end repeat
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; 0xF0 -> 0x81D0, 0xF1 -> 0x91D1
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store dword 0x91D181D0 at utf8_table+2*(0xF0-0x80)
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cp866_table:
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db $C0,$C1,$C2,$C3,$C4,$C5,$C6,$C7 , $C8,$C9,$CA,$CB,$CC,$CD,$CE,$CF ; 8
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db $D0,$D1,$D2,$D3,$D4,$D5,$D6,$D7 , $D8,$D9,$DA,$DB,$DC,$DD,$DE,$DF ; 9
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db $E0,$E1,$E2,$E3,$E4,$E5,$E6,$E7 , $E8,$E9,$EA,$EB,$EC,$ED,$EE,$EF ; A
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db '?','?','?','?','?','?','?','?' , '?','?','?','?','?','?','?','?' ; B
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db '?','?','?','?','?','?','?','?' , '?','?','?','?','?','?','?','?' ; C
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db '?','?','?','?','?','?','?','?' , '?','?','?','?','?','?','?','?' ; D
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db $F0,$F1,$F2,$F3,$F4,$F5,$F6,$F7 , $F8,$F9,$FA,$FB,$FC,$FD,$FE,$FF ; E
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db $A8,$B8,$AA,$BA,$AF,$BF,$A1,$A2 , $B0,$95,$B7,'?',$B9,$A4,'?','?' ; F
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; 0 1 2 3 4 5 6 7 8 9 A B C D E F
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