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[Request] Help with C++ String -> Char Array
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GMZorita
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PostPosted: Sun Jun 08, 2008 6:21 pm    Post subject: Reply with quote
HalfPrime wrote:
Was there something wrong with your previous thread that you had to repost?
http://forum.cheatengine.org/viewtopic.php?t=246296
xor gave you a method, wiccaan gave you code.


That one wasnt good, bad explained.
x0r give me the method but i have no idea on how it works, also wiccaan code doesnt works for my purpose.

Anyone can help me w/ the code?
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oib111
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PostPosted: Sun Jun 08, 2008 6:45 pm    Post subject: Reply with quote
Lol. Did you look up x0rs method on msdn? Because that should explain it pretty well. Or ask someone that knows how it works.
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HalfPrime
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PostPosted: Sun Jun 08, 2008 9:22 pm    Post subject: Reply with quote
Goddamn. Shit like this is why MSers should be confined to the MS section. That solution wasn't good enough for you, so you need some spoon feeding?

Code:
BYTE conv(char *ch){
char c;
if(ch[0]>='0' && ch[0] <='9'){ch[0] -= 48;}else
if(ch[0]>='A' && ch[0] <='Z'){ch[0] -= 50;}else
if(ch[0]>='a' && ch[0] <='z'){ch[0] -= 81;}
c = ch[0]*16;
if(ch[1]>='0' && ch[1] <='9'){ch[1] -= 48;}else
if(ch[1]>='A' && ch[1] <='Z'){ch[1] -= 50;}else
if(ch[1]>='a' && ch[1] <='z'){ch[1] -= 81;}
c +=ch[1];
return c;}

main:
string str = "";
for(int c=0;c<(szString.length()+1)/3;c+=3)
str += conv(&szString[c]);


Enjoy some shit code. Now, leave if you can't look up 2 commands. And please don't come back if all you want is a handout.

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DoomsDay
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PostPosted: Mon Jun 09, 2008 12:30 am    Post subject: Reply with quote
GMZorita, I really suggest you to look at an ASCII table. Anyways, the pseudo I gave you should work just fine.
I added comments if you wish to understnd the algorithm better:
Code:
StrToByteArray   proc   lpText,lpBuffer
      invoke   lstrlen,lpText      ;Get the length of the text buffer
      push   eax               ;Store it in the stack > [ESP]
      ;Trims the spaces
      mov      ecx,eax            ;ECX now contains the buffer length
      mov      eax,20h            ;EAX now contains the space char - ' '
      @@:
      mov      edi,lpText         ;EDI(dest) leads to the given text buffer
      repne   scasb            ;scasb scans for al for [edi+n] ecx times.
                           ;with repne: for (;ECX > 0; ECX--){if (EAX.LOWBYTE == BYTE PTR [EDI]){BREAK}}
      jnz      @F               ;did not break from the loop? No spaces here :D
         mov      esi,edi            ;EDI points to the letter AFTER the space, MOV'd to ESI(source)
         dec      edi               ;EDI now points to the space
         inc      ecx               ;ECX points to the last char, I want it to point to the null-terminator (0)
         rep      movsb            ;Copies the string, byte by byte, n(=ECX) times
         dec      dword ptr [esp]      ;[ESP] contains the buffer length pushed earlier, decreased by one
         mov      ecx,[esp]         ;ECX now contains the 'updated' length (length -= 1)
         jmp      @B               ;jumps backwards to '@@:'
      @@:
      ;To upper-case
      invoke   CharUpperBuff,lpText,[esp];self-explained
      mov      ecx,[esp]            ;*Holds the length(as it's going to get modified)
      ;Converting                                                      ;Exampe: '3B'
      mov      edi,lpBuffer         ;EDI (dest) now points to the output buffer
      mov      esi,lpText            ;ESI (source) now points to the text buffer
      @@:
      mov      ah,byte ptr [esi]      ;ah = temp, al = byte | ah <- byte ptr [ESI+nS] | ah {0x33} | ASCII '3'
      .if ( ah < 3Ah)               ;if the byte is a digit                     | true
         sub      ah,30h            ;ASCII numerial to number   (-0x30)            | ah {0x03}
      .else
         sub      ah,37h            ;ASCII char ('A'-'F')      (-0x37)
      .endif
      mov      al,ah               ;al (result byte) <- ah (temp byte)            | al {0x03}
      shl      al,4               ;next nibble (al *= 0x10)                  | al {0x30}
      mov      ah,byte ptr [esi+1]      ;ah <- byte ptr [ESI+nS+1]                  | ah {0x42} | ASCII 'B'
      .if ( ah < 3Ah)               ;                                    | false
         sub      ah,30h
      .else
         sub      ah,37h            ;                                    | ah {0x0B}
      .endif
      add      al,ah               ;Adds the temp nibble to AL                  | al {0x3B}
      mov      byte ptr [edi],al      ;Moves AL to [EDI+nD]
      inc      edi                  ;nD +=1
      add      esi,2               ;nS +=2
      sub      dword ptr [esp],2      ;length -=2
      jnz      @B                  ;if !(length == 0) go backwards to '@@:'
      pop      [esp-4]               ;The length was held in the stack, time to remove it
      mov      eax,ecx               ;The length held earlier*
      shr      eax,1               ;length /= 2 (the output buffer's length)
   pop      ebp
   retn   08                     ;Return length
StrToByteArray endp
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GMZorita
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PostPosted: Mon Jun 09, 2008 11:39 am    Post subject: Reply with quote
HalfPrime wrote:
Goddamn. Shit like this is why MSers should be confined to the MS section. That solution wasn't good enough for you, so you need some spoon feeding?

Code:
BYTE conv(char *ch){
char c;
if(ch[0]>='0' && ch[0] <='9'){ch[0] -= 48;}else
if(ch[0]>='A' && ch[0] <='Z'){ch[0] -= 50;}else
if(ch[0]>='a' && ch[0] <='z'){ch[0] -= 81;}
c = ch[0]*16;
if(ch[1]>='0' && ch[1] <='9'){ch[1] -= 48;}else
if(ch[1]>='A' && ch[1] <='Z'){ch[1] -= 50;}else
if(ch[1]>='a' && ch[1] <='z'){ch[1] -= 81;}
c +=ch[1];
return c;}

main:
string str = "";
for(int c=0;c<(szString.length()+1)/3;c+=3)
str += conv(&szString[c]);


Enjoy some shit code. Now, leave if you can't look up 2 commands. And please don't come back if all you want is a handout.


Stop being stupid, keep your opnion to yourself, im pretty sure no one cares about what you think.
Thanks for the function anyway i will try it.

DoomsDay wrote:
GMZorita, I really suggest you to look at an ASCII table. Anyways, the pseudo I gave you should work just fine.
I added comments if you wish to understnd the algorithm better:
Code:
StrToByteArray   proc   lpText,lpBuffer
      invoke   lstrlen,lpText      ;Get the length of the text buffer
      push   eax               ;Store it in the stack > [ESP]
      ;Trims the spaces
      mov      ecx,eax            ;ECX now contains the buffer length
      mov      eax,20h            ;EAX now contains the space char - ' '
      @@:
      mov      edi,lpText         ;EDI(dest) leads to the given text buffer
      repne   scasb            ;scasb scans for al for [edi+n] ecx times.
                           ;with repne: for (;ECX > 0; ECX--){if (EAX.LOWBYTE == BYTE PTR [EDI]){BREAK}}
      jnz      @F               ;did not break from the loop? No spaces here :D
         mov      esi,edi            ;EDI points to the letter AFTER the space, MOV'd to ESI(source)
         dec      edi               ;EDI now points to the space
         inc      ecx               ;ECX points to the last char, I want it to point to the null-terminator (0)
         rep      movsb            ;Copies the string, byte by byte, n(=ECX) times
         dec      dword ptr [esp]      ;[ESP] contains the buffer length pushed earlier, decreased by one
         mov      ecx,[esp]         ;ECX now contains the 'updated' length (length -= 1)
         jmp      @B               ;jumps backwards to '@@:'
      @@:
      ;To upper-case
      invoke   CharUpperBuff,lpText,[esp];self-explained
      mov      ecx,[esp]            ;*Holds the length(as it's going to get modified)
      ;Converting                                                      ;Exampe: '3B'
      mov      edi,lpBuffer         ;EDI (dest) now points to the output buffer
      mov      esi,lpText            ;ESI (source) now points to the text buffer
      @@:
      mov      ah,byte ptr [esi]      ;ah = temp, al = byte | ah <- byte ptr [ESI+nS] | ah {0x33} | ASCII '3'
      .if ( ah < 3Ah)               ;if the byte is a digit                     | true
         sub      ah,30h            ;ASCII numerial to number   (-0x30)            | ah {0x03}
      .else
         sub      ah,37h            ;ASCII char ('A'-'F')      (-0x37)
      .endif
      mov      al,ah               ;al (result byte) <- ah (temp byte)            | al {0x03}
      shl      al,4               ;next nibble (al *= 0x10)                  | al {0x30}
      mov      ah,byte ptr [esi+1]      ;ah <- byte ptr [ESI+nS+1]                  | ah {0x42} | ASCII 'B'
      .if ( ah < 3Ah)               ;                                    | false
         sub      ah,30h
      .else
         sub      ah,37h            ;                                    | ah {0x0B}
      .endif
      add      al,ah               ;Adds the temp nibble to AL                  | al {0x3B}
      mov      byte ptr [edi],al      ;Moves AL to [EDI+nD]
      inc      edi                  ;nD +=1
      add      esi,2               ;nS +=2
      sub      dword ptr [esp],2      ;length -=2
      jnz      @B                  ;if !(length == 0) go backwards to '@@:'
      pop      [esp-4]               ;The length was held in the stack, time to remove it
      mov      eax,ecx               ;The length held earlier*
      shr      eax,1               ;length /= 2 (the output buffer's length)
   pop      ebp
   retn   08                     ;Return length
StrToByteArray endp

I will re-try it later, and thx for explaining the code .
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