[RESOLVED] Comparision

I have a database of hexadecimal lists like
"12 A2 3E BB DC 5E AD C7 00 ?? A2 00 EE ?? C3 55 90"
there are ??(two question marks) for unknown value

I have to compare the lists in database with a list of actual hex values read from an executable file. There are no question marks in these hex values read, instead there is an hex value

I am trying to find the efficient way to compare these two lists.

One way I thought of is to make binary search trees of the two lists but the problem with this solution is how do I treat "??" in the first list.

or help me with another "efficient" way.

Any help is appreciated. :)

Quote:

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Originally Posted by aquarianutsav

I have a database of hexadecimal lists like
"12 A2 3E BB DC 5E AD C7 00 ?? A2 00 EE ?? C3 55 90"
there are ??(two question marks) for unknown value

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What is a data type of this field in the database?
Where do you "see" this double-question-mark?

with database i meant ini file.

that ini file has more than 5000 sections and in each section there is this list which is the value of key "signature"

i have to compare this signature with the signature ot the exe file and find the type of exe file.

for example :

[!EP (ExE Pack) V1.0 -> Elite Coding Group]
signature = 60 68 54 ?? ?? ?? B8 48 ?? ?? ?? FF
ep_only = true

[Nullsoft Install System v1.98]
signature = 83 EC 0C 53 56 57 FF 15 2C 81 40
ep_only = true


[Nullsoft Install System v1.xx]
signature = 50 53 51 52 1E 06 9C B8 21 35 CD 21 53 BB ?? ?? 26 ?? ?? 49 48 5B
ep_only = true

[Zortech C]
signature = E8 ?? ?? 2E FF ?? ?? ?? FC 06
ep_only = true

make a regex for each type. map from the regex/type onto all the read values that match the regex.

60 60 54 [0-9a-fA-F]{2} [0-9a-fA-F]{2} [0-9a-fA-F]{2} b8 48 ...

The time taken in reading the values of keys of around 5500 sections is 16 seconds and it takes only a second to make 5500 maps from the values read.

How do I reduce the time taken to read the file?

How are you reading it now?

previously I was reading it using GetPrivateProfileString and GetPrivateProfileSectionNames.
Now I am using 'fread' and it has solved the purpose.
Thanks.