flat assembler
Message board for the users of flat assembler.

Home Search Register
Log in to check your private messages Log in

Index > Windows > Convert float to hex
Author
Thread Post new topic Reply to topic
FrozenKnight



Joined: 24 Jun 2005
Posts: 128
FrozenKnight 16 Oct 2007, 09:37
I could have sworn i posed this a while back but i cant find it even with the search. anyway the old version had a serious error where numbers with a fractional component around one hundred millionth were scrambled by an mistake on my part where i stored the working exponent in a 32 bit var. anyway i solved that problem and a few other minor ones.

and yes this one gives a correct return for pi = 3.1415926535897932384 (further digits have no effect.)

Code:
FORMAT PE GUI 4.0
ENTRY  Start

include 'win32a.inc'

MAXTEXT = 255

section '.idata' import data readable writeable
  library     kernel32,           'kernel32.dll',\
              user32,             'user32.dll'

  import      kernel32,\
              GetModuleHandle,    'GetModuleHandleA',\
              ExitProcess,        'ExitProcess';,\

  import      user32,\
              SendMessage,        'SendMessageA',\
              PostMessage,        'PostMessageA',\
              DialogBoxParam,     'DialogBoxParamA',\
              SendDlgItemMessage, 'SendDlgItemMessageA',\
              GetDlgItem,         'GetDlgItem',\
              EndDialog,          'EndDialog',\
              SetWindowLong,      'SetWindowLongA',\
              CallWindowProc,     'CallWindowProcA',\
              MessageBox,         'MessageBoxA'

section '.code' code readable executable

proc fltedit_proc, hwnd, msg, wparam, lparam
  cmp   [msg], WM_CHAR
  jnz  .norm
  mov   eax, [wparam]
  cmp   ax, 00008h
  jz   .norm
  cmp   ax, '-'
  jz   .negitive
  cmp   ax, '.'
  jz   .decmal
  cmp   ax, '0'
  jl   .leave
  cmp   ax, '9'
  jg   .leave
 .norm:
  push  [lparam]
  push  [wparam]
  push  [msg]
  push  [hwnd]
  push  [proc_edit]
  call  [CallWindowProc]
 .leave:
  ret
 .negitive:
  push  0
  push  0
  push  EM_GETSEL
  push  [hwnd]
  call  [SendMessage]
  cmp   ax, 0
  jz   .norm
  jmp  .leave
 .decmal:
  push  [wparam]
  push  [hwnd]
  call  scan
  cmp   eax, 0
  jz   .leave
  jmp  .norm
endp

proc scan, hwnd:DWORD, char:DWORD
  local fltstring[MAXTEXT+1]:BYTE
  push  ebx
  push  ecx
  push  edx

  lea   ebx, [fltstring]
  push  ebx
  push  MAXTEXT+1
  push  WM_GETTEXT
  push  [hwnd]
  call  [SendMessage]

  xor   ecx, ecx
  xor   eax, eax
 .loop:
  inc   ecx
  cmp   BYTE [SS:ebx+ecx-1], 0
  jz   .test
  cmp   BYTE [SS:ebx+ecx-1], '.'
  jnz  .loop
  inc   eax
  jmp  .loop

 .test:
  mov   edx, [char]
  cmp   dx, '.'
  jnz  .bad
  cmp   eax, 0
  jz   .good
 .bad:
  xor   eax, eax
  jmp  .end
 .good:
  mov   eax, 1
 .end:
  pop   edx
  pop   ecx
  pop   ebx
  ret
endp

;section no longer needed due to checks in above subclass
;proc finddec, strptr:DWORD

proc flttovalue, string:DWORD, value:DWORD;, decimal:DWORD
  local  temp:DWORD, cword:WORD, multiplyer:TBYTE
  push  ebx
  push  ecx
  mov   ebx, [string]
  finit
  ;fstcw [cword]
  ;mov   ax, [cword]
  ;or    ax, 00300h
  ;and   ax, 0F3FFh
  ;mov   [cword], ax
  ;fldcw [cword]
  ;mov   [temp], 0
  ;fild  [temp]
  fldz
  xor   eax, eax
  mov   eax, 1
  cmp   BYTE [SS:ebx], '-'
  jnz   @f
  mov   eax, -1
  inc   ebx
 @@:
  push  eax
  ;fldz
 .ipart:
  cmp   BYTE [SS:ebx], '.'
  jz   .fpart0
  cmp   BYTE [SS:ebx], 0
  jz   .fin
  ;mov   [temp], 10
  ;fild  [temp]
  fimul [const10]
  xor   eax, eax
  mov   al, BYTE [SS:ebx]
  sub   al, '0'
  mov   [temp], eax
  fild  [temp]
  faddp st1, st0
  inc   ebx
  jmp  .ipart
 .fpart0:
  inc   ebx
  lea   ecx, [multiplyer]
  fld1
  fstp  tbyte [ecx]
 .fpart1:
  cmp   BYTE [SS:ebx], '.'
  jz   .fin
  cmp   BYTE [SS:ebx], 0
  jz   .fin
  xor   eax, eax
  mov   al, BYTE [SS:ebx]
  sub   al, '0'
  mov   [temp], eax
  ;fild  [temp]
  ;mov  eax, 10                  ;<==== error here
  ;mul  ecx
  ;mov  ecx, eax
  ;mov  [temp], ecx
  ;mov   [temp], 10
  fld   TBYTE [ecx]
  fidiv [const10]
  fstp  TBYTE [ecx]
  fld   TBYTE [ecx]
  fild  [temp]
  fmulp st1, st0
  faddp st1, st0
  inc   ebx
  jmp  .fpart1
 .fin:
  ;fldpi ;test
  pop   eax
  mov   [temp], eax
  fild  [temp]
  fmulp st1, st0
  ;fstcw [cword]
  ;mov   ax, [cword]
  ;mov   cx, WORD [iFloatType]
  ;shl   cx, 8
  ;or    cx, 0F0FFh
  ;and   ax, cx
  ;mov   [cword], ax
  ;fldcw [cword]
  mov   eax, [value]
  mov   edx, [iFloatType]
  cmp   edx, const80
  jnz   @f
  ;fldpi ;test
  fstp  TBYTE [eax]
 @@:
  cmp   edx, const64
  jnz   @f
  fstp  QWORD [eax]
 @@:
  cmp   edx, const32
  jnz   @f
  fstp  DWORD [eax]
 @@:
  mov   eax, esi
  pop   ecx
  pop   ebx
  ret
endp

proc valuetostr, string:DWORD, value:DWORD
  push  ebx
  push  ecx
  push  edx
  push  esi
  mov   edx, [iFloatType]
  mov   ecx, 10
  cmp   edx, const80
  jz   .start
  mov   ecx, 8
  cmp   edx, const64
  jz   .start
  mov   ecx, 4
  cmp   edx, const32
  jz   .start
  xor   ecx, ecx
  xor   eax, eax
  jmp  .end
 .start:
  mov   esi, [string]
  mov   edx, [value]
  mov   ebx, hexcharset
  xor   eax, eax
 .next:
  mov   al, [edx+ecx-1]
  shr   al, 4
  and   al, 0fh
  mov   al, [ebx + eax]
  mov   [esi], al
  inc   esi
  mov   al, [edx+ecx-1]
  and   al, 0fh
  mov   al, [ebx + eax]
  mov   [esi], al
  inc   esi
  ;inc   edx
  dec   ecx
  jnz  .next
  mov   BYTE [esi], 0
 .end:
  pop   esi
  pop   edx
  pop   ecx
  pop   ebx
  ret
endp

proc  flttohex, hWndFlt:DWORD, hWndHex:DWORD
  local fltstring[MAXTEXT+1]:BYTE, hexstring[21]:BYTE, fltVlaue:TBYTE
  lea   eax, [fltstring]
;  push  eax
  push  eax
  push  MAXTEXT+1
  push  WM_GETTEXT
  push  [hWndFlt]
  call  [SendMessage]
  cmp   eax, 0
  jz   .blank
;  call  finddec
  cmp   eax, -1
  jz   .badvalue
 ; int   3
 ; push  eax
  lea   eax, [fltVlaue]
  push  eax
  lea   eax, [fltstring]
  push  eax
  call  flttovalue

  lea   eax, [fltVlaue]
  push  eax
  lea   eax, [hexstring]
  push  eax
  call  valuetostr
  cmp   eax, 0
  jz   .badvalue

  lea   eax, [hexstring]
  push  eax
  push  0
  push  WM_SETTEXT
  push  [hWndHex]
  call  [SendMessage]
  ret

 .blank:
  push  fltblank
  push  0
  push  WM_SETTEXT
  push  [hWndHex]
  call  [SendMessage]
  ret

 .badvalue:
  push  flterror
  push  0
  push  WM_SETTEXT
  push  [hWndHex]
  call  [SendMessage]
  ret
endp
;flterror
;fltblank

proc  command, hdlg, wparam, lparam
  mov  eax, [wparam]
  shr  eax, 16
  and  eax, 0FFFFh
  cmp  eax, EN_CHANGE
  jnz  @f
    mov  eax, [wparam]
    and  eax, 0FFFFh
    cmp  eax, IDI_FLOATNUMBER
    jz  .fltcnvt
    jmp .badcmd
 @@:
  cmp  eax, BN_CLICKED
  jnz  @f
    mov  eax, [wparam]
    and  eax, 0FFFFh
    cmp  eax, IDI_FLOAT32
    jz  .flt32
    cmp  eax, IDI_FLOAT64
    jz  .flt64
    cmp  eax, IDI_FLOAT80
    jz  .flt80
    cmp  eax, IDI_EXIT
    jz  .exit
 @@:
 .badcmd:
  xor  eax, eax
  ret

db "FrozenKnight's Signiture",0B6h,\
   "this program is provided as a ",\
   "tool for your use. Free of charge. ",\
   "Please don't steal my hard work or ",\
   "or cheat others out of it. Thank You Smile"
 .fltcnvt:
  push IDI_HEXNUMBER
  push [hdlg]
  call [GetDlgItem]
  push eax
  push IDI_FLOATNUMBER
  push [hdlg]
  call [GetDlgItem]
  push eax
  call flttohex
  xor  eax, eax
  ret

 .flt32:
  push  0
  push  1
  push  BM_SETCHECK
  push  IDI_FLOAT32
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  0
  push  BM_SETCHECK
  push  IDI_FLOAT64
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  0
  push  BM_SETCHECK
  push  IDI_FLOAT80
  push  [hdlg]
  call  [SendDlgItemMessage]

  mov   [iFloatType], const32
  jmp  .fltcnvt

 .flt64:
  push  0
  push  0
  push  BM_SETCHECK
  push  IDI_FLOAT32
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  1
  push  BM_SETCHECK
  push  IDI_FLOAT64
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  0
  push  BM_SETCHECK
  push  IDI_FLOAT80
  push  [hdlg]
  call  [SendDlgItemMessage]

  mov   [iFloatType], const64
  jmp  .fltcnvt

 .flt80:
  push  0
  push  0
  push  BM_SETCHECK
  push  IDI_FLOAT32
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  0
  push  BM_SETCHECK
  push  IDI_FLOAT64
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  1
  push  BM_SETCHECK
  push  IDI_FLOAT80
  push  [hdlg]
  call  [SendDlgItemMessage]

  mov   [iFloatType], const80
  jmp  .fltcnvt

 .exit:
  push  0
  push  dword [hdlg]
  call  [EndDialog]
  xor   eax,eax
  ret
endp

proc  dlg_proc, hdlg, msg, wparam, lparam
  mov   eax, [msg]
  cmp   eax, WM_COMMAND
  jz   .command
  cmp   eax, WM_INITDIALOG
  jz   .initdlg
  cmp   eax, WM_CLOSE
  jz   .wmclose
  xor   eax,eax
  ret

 .command:
  push  [lparam]
  push  [wparam]
  push  [hdlg]
  call  command
  ret

 .initdlg:
  push  [hdlg]
  pop   [hWndDlg]

  push  0
  push  1
  push  EM_SETREADONLY
  push  IDI_HEXNUMBER
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  MAXTEXT
  push  EM_LIMITTEXT
  push  IDI_FLOATNUMBER
  push  [hdlg]
  call  [SendDlgItemMessage]

  push  0
  push  1
  push  BM_SETCHECK
  push  IDI_FLOAT64
  push  [hdlg]
  call  [SendDlgItemMessage]
  mov   [iFloatType], const64

  ;subclass float field to prevent unwanted charicters from being input
  push  IDI_FLOATNUMBER
  push  [hdlg]
  call  [GetDlgItem]
  push  fltedit_proc
  push  GWL_WNDPROC
  push  eax
  call  [SetWindowLong]
  cmp   eax, 0
  jz    .wmclose
  mov   [proc_edit], eax
  xor   eax, eax
  ret

.wmclose:  ;close button or <alt>+<f4>
  push  0
  push  dword [hdlg]
  call  [EndDialog]
  xor   eax,eax
  ret
endp

Start:
  push   0
  call   [GetModuleHandle]   ;get handel to program instance
  mov    [hInstance], eax
  push   0
  push   dlg_proc
  push   HWND_DESKTOP
  push   IDD_MAINDIALOG
  push   eax
  call   [DialogBoxParam] ;create dialog
  push   0
  call   [ExitProcess]
  mov    eax, flttovalue


section '.rsrc' resource data readable

  IDD_MAINDIALOG  = 01000h
  IDI_FLOATNUMBER = 00101h
  IDI_HEXNUMBER   = 00102h
  IDI_EXIT        = 00201h
  IDI_FLOAT32     = 00301h
  IDI_FLOAT64     = 00302h
  IDI_FLOAT80     = 00303h

  const32         = 00h
  const64         = 02h
  const80         = 03h

  directory RT_DIALOG, dialogs

  resource dialogs,\
           IDD_MAINDIALOG, LANG_ENGLISH+SUBLANG_DEFAULT, maindialog

  dialog maindialog, 'Float=>Hex Converter', CW_USEDEFAULT, CW_USEDEFAULT,\
                     202, 67, DS_MODALFRAME or WS_POPUP or WS_CAPTION or WS_SYSMENU
    dialogitem 'EDIT', '', IDI_FLOATNUMBER, 24, 10, 166, 12,\
               ES_CENTER or WS_CHILD or WS_VISIBLE or WS_TABSTOP or WS_BORDER or ES_AUTOHSCROLL
    dialogitem 'EDIT', '', IDI_HEXNUMBER, 24, 30, 166, 12,\
               ES_CENTER or WS_CHILD or WS_VISIBLE or WS_TABSTOP or WS_BORDER
    dialogitem 'STATIC', 'Float', 0, 5, 11, 19, 10,\
               SS_LEFT or WS_CHILD or WS_VISIBLE
    dialogitem 'STATIC', 'Hex', 0, 7, 32, 15, 10,\
               SS_LEFT or WS_CHILD or WS_VISIBLE
    dialogitem 'BUTTON', '32', IDI_FLOAT32, 39, 47, 26, 14,\
               BS_RADIOBUTTON or WS_CHILD or WS_VISIBLE or WS_TABSTOP
    dialogitem 'BUTTON', '64', IDI_FLOAT64, 65, 47, 26, 14,\
               BS_RADIOBUTTON or WS_CHILD or WS_VISIBLE or WS_TABSTOP
    dialogitem 'BUTTON', '80', IDI_FLOAT80, 89, 47, 26, 14,\
               BS_RADIOBUTTON or WS_CHILD or WS_VISIBLE or WS_TABSTOP
    dialogitem 'BUTTON', '&Exit', IDI_EXIT, 129, 47, 60, 14,\
               BS_PUSHBUTTON or WS_CHILD or WS_VISIBLE or WS_TABSTOP
  enddialog


section '.const' data readable
  flterror       db  '<Error: Unable to convert>',0
  fltblank       db  '',0
  hexcharset     db  '0123456789ABCDEF'
  const10        dd  10

section '.data?' data readable writable
  hInstance      dd  ?
  proc_edit      dd  ?
  hWndDlg        dd  ?
  iFloatType     dd  ?


Description:
Download
Filename: Float to Hex.zip
Filesize: 4.55 KB
Downloaded: 364 Time(s)

Post 16 Oct 2007, 09:37
View user's profile Send private message Reply with quote
Display posts from previous:
Post new topic Reply to topic

Jump to:  


< Last Thread | Next Thread >
Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Main index Download Documentation Examples Message board

Copyright © 1999-2024, Tomasz Grysztar. Also on GitHub, YouTube.

Website powered by rwasa.