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busclock

(Asm) How to get 2nd string from given string?

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busclock

I need to modify some source code. I need to get a 2nd string from given string which contains 2 string. The length of 1st string is always changed time to time. For example:

NuQW4CSS0Qpa8TnZ

or in hex:

01 01 01 01 01 01 01 01 1C 01 01 01 01 01 08 4E 75 51 57 34 43 53 53 01 01 01 01 01 08 30 51 70 61 38 54 6E 5A

the 1st string

NuQW4CSS (4E 75 51 57 34 43 53 53)

it begins with 1 byte in front (08) as the length of the string

the 2nd string

0Qpa8TnZ (30 51 70 61 38 54 6E 5A)

it also begins with 1 byte in front (08) as the length of the string

The problem in the source code i got is, it gets the 2nd string with fixed method, always get it from the 29th byte, which is actually the 2nd string is not always at that position.

getstring.zip

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Ufo-Pu55y

something like this:

.if dx==BN_CLICKED	.IF ax==IDC_GET
pushad
mov esi, offset packet01
.repeat
lodsb
.until al != 1 && byte ptr [esi+1] != 1
mov edi, offset GetHash01
movzx ecx,al
rep movsb
.repeat
lodsb
.until al != 1
mov edi, offset GetHash02
movzx ecx,al
rep movsb
invoke SetDlgItemText,hwwnd,EDIT_HASHSTRING1,addr GetHash01
invoke SetDlgItemText,hwwnd,EDIT_HASHSTRING1,addr GetHash02
popad .ENDIF
.ENDIF

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