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From: johnl@ima.UUCP
Newsgroups: net.micro.pc
Subject: Re: Re: CHecksums in Object files
Message-ID: <103700022@ima.UUCP>
Date: Wed, 16-Oct-85 13:19:00 EDT
Article-I.D.: ima.103700022
Posted: Wed Oct 16 13:19:00 1985
Date-Received: Sat, 19-Oct-85 05:28:30 EDT
References: <319@sdcc13.UUCP>
Lines: 14
Nf-ID: #R:sdcc13:-31900:ima:103700022:000:569
Nf-From: ima!johnl    Oct 16 13:19:00 1985


/* Written  8:47 pm  Oct  8, 1985 by 40651275@sdcc13 in ima:net.micro.pc */
>    I would like to know the method that Microsoft
>    Compilers/Linkers/Etc.. use to determine the checksum byte in the
>    records of .OBJ files.

The checksum is the negative of the byte-wise sum of all of the other
bytes in the record, which means that if you add together all of the bytes
including the checksum, the result should be zero.

[This information from the Intel 8086 Relocatable Object Module Formats
manual, from which the MS formats are derived.]

John Levine, ima!johnl