Hex ASCII to bin. Help me, please!

to convert an ASCII hexadecimal number... you need to compare digits with 'A' and '9' (not 0ah and 9)

if the digit is lower or equal to '9', then, just substract '0' and add the result to the total, shifted by the power of 16 corresponding to the rank of the digit.
if the digit is greater or equal to A, just substract 'A' to the digit, etc etc...

ones you threaded all digits, you will have the result.

in html, colors are defined in hexadecimal, or in plain text (red, blue, etc...)

this function come from this topic:
http://board.flatassembler.net/topic.php?p=82651

Code:

specialchar:
.limit equ ds:ebp+xhtml.instop
     cmp al,'&'
    je .special
 cmp al,' '
        je @f
       cmp al,9
    je @f
       cmp al,0ah
  je @f
       cmp al,0dh
  je @f
       jmp .ok
@@:
  cmp byte[edi-1],' '
       clc
 je @f
       mov al,' '
.ok:
    stc
@@:
      ret
.special:
        lea edx,[esi+1]
     cmp byte[edx],'#'
 je .num
     mov ecx,34
.name:
    mov ebx,[htchars+ecx*4]
     or ebx,ebx
  je .none?
@@:
        mov ah,[ebx]
        mov al,[edx]
        inc ebx
     inc edx
     or al,al
    je .none?
   cmp al,ah
   jne .none?
  cmp al,';'
        jne @b
      lea esi,[edx-1]
     mov al,cl
   jmp .end
.none?:
     lea edx,[esi+1]
     inc cl
      jne .name
.none:
     mov al,[esi]
.end:
   or al,al
    jne .ok
     clc
 ret
.num:
    xor ebx,ebx
 cmp byte[edx+1],'x'
       je .hex
     cmp byte[edx+1],'X'
       je .hex
@@:
  inc edx
     cmp edx,[.limit]
    jge .none
   movzx eax,byte[edx]
 cmp al,';'
        je .num?
    cmp al,'0'
        jl .none
    cmp al,'9'
        jg .none
    sub al,'0'
        lea ebx,[ebx*5]
     lea ebx,[ebx*2+eax]
 jmp @b
.hex:
 inc edx
@@:
  inc edx
     cmp edx,[.limit]
    jge .none
   movzx eax,byte[edx]
 cmp al,';'
        je .num?
    cmp al,'9'
        jg .alpha?
  cmp al,'0'
        jl .none
    sub al,'0'
        shl ebx,4
   add ebx,eax
 jmp @b
.alpha?:
      or al,20h
   cmp al,'a'
        jl .none
    cmp al,'f'
        jg .none
    sub al,'a'-10
     shl ebx,4
   add ebx,eax
 jmp @b
.num?:
        or ebx,ebx
  jl .none
    cmp ebx,100h
        jnl .none
   mov al,bl
   mov esi,edx
 jmp .ok
htchars:
dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000
dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000
dd 0000,0000, .34,0000,0000,0000, .38,0000,0000,0000,0000,0000,0000,0000,0000,0000
dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000

dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000
dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000
dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000
dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000

dd .128,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,.139,0000,0000,0000,0000
dd 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,.155,.156,0000,0000,.159
dd .160,.161,.162,.163,.164,.165,.166,.167,.168,.169,.170,.171,.172,.173,.174,.175
dd .176,.177,.178,.179,.180,.181,.182,.183,.184,.185,.186,.187,.188,.189,.190,.191

dd .192,.193,.194,.195,.196,.197,.198,.199,.200,.201,.202,.203,.204,.205,.206,.207
dd .208,.209,.210,.211,.212,.213,.214,.215,.216,.217,.218,.219,.220,.221,.222,.223
dd .224,.225,.226,.227,.228,.229,.230,.231,.232,.233,.234,.235,.236,.237,.238,.239
dd .240,.241,.242,.243,.244,.245,.246,.247,.248,.249,.250,.251,.252,.253,.254,.255
.ch:
.34  db 'quot;'
.38     db 'amp;'
.128     db 'euro;'
.139    db 'lt;'
.155      db 'gt;'
.156      db 'oelig;'
.159   db 'Yuml;'
.160    db 'nbsp;'
.161    db 'iexcl;'
.162   db 'cent;'
.163    db 'pound;'
.164   db 'curren;'
.165  db 'yen;'
.166     db 'brvbar;'
.167  db 'sect;'
.168    db 'uml;'
.169     db 'copy;'
.170    db 'ordf;'
.171    db 'laquo;'
.172   db 'not;'
.173     db 'shy;'
.174     db 'reg;'
.175     db 'masr;'
.176    db 'deg;'
.177     db 'plusmn;'
.178  db 'sup2;'
.179    db 'sup3;'
.180    db 'acute;'
.181   db 'micro;'
.182   db 'para;'
.183    db 'middot;'
.184  db 'cedil;'
.185   db 'sup1;'
.186    db 'ordm;'
.187    db 'raquo;'
.188   db 'frac14;'
.189  db 'frac12;'
.190  db 'frac34;'
.191  db 'iquest;'
.192  db 'Agrave;'
.193  db 'Aacute;'
.194  db 'Acirc;'
.195   db 'Atilde;'
.196  db 'Auml;'
.197    db 'Aring;'
.198   db 'Aelig;'
.199   db 'Ccedil;'
.200  db 'Egrave;'
.201  db 'Eacute;'
.202  db 'Ecirc;'
.203   db 'Euml;'
.204    db 'Igrave;'
.205  db 'Iacute;'
.206  db 'Icirc;'
.207   db 'Iuml;'
.208    db 'eth;'
.209     db 'Ntilde;'
.210  db 'Ograve;'
.211  db 'Oacute;'
.212  db 'Ocirc;'
.213   db 'Otilde;'
.214  db 'Ouml;'
.215    db 'times;'
.216   db 'Oslash;'
.217  db 'Ugrave;'
.218  db 'Uacute;'
.219  db 'Ucirc;'
.220   db 'Uuml;'
.221    db 'Yacute;'
.222  db 'thorn;'
.223   db 'szlig;'
.224   db 'agrave;'
.225  db 'aacute;'
.226  db 'acirc;'
.227   db 'atilde;'
.228  db 'auml;'
.229    db 'aring;'
.230   db 'aelig;'
.231   db 'ccedil;'
.232  db 'egrave;'
.233  db 'eacute;'
.234  db 'ecirc;'
.235   db 'euml;'
.236    db 'igrave;'
.237  db 'iacute;'
.238  db 'icirc;'
.239   db 'iuml;'
.240    db 'eth;'
.241     db 'ntilde;'
.242  db 'ograve;'
.243  db 'oacute;'
.244  db 'ocirc;'
.245   db 'otilde;'
.246  db 'ouml;'
.247    db 'divide;'
.248  db 'oslash;'
.249  db 'ugrave;'
.250  db 'uacute;'
.251  db 'ucirc;'
.252   db 'uuml;'
.253    db 'yacute;'
.254  db 'thorn;'
.255   db 'yuml;'

of course, if you want to test this function, you will need to provide the evironment... that is a little complex to aboard.

it will thread an ascii string as a special char in html form.