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“ganesh pashupathi” wrote in message news:xxxxx@ntfsd…
Hi,
I am not sure of what I am doing is right in this case. Please comment on my approach.
As per my previous posts I insert a header in a file and also the file data is encrypted. There are two places where I can modify the file size . 1) IRP_MJ_WRITE and 2) IRP_MJ_SET_INFORMATION without paging i/o flag set.
In some applications when the file is written to, the paging write is seen first. I encrypt the data out here. But I cannot insert my header here since I cannot modify the file size in the paging write.
Next I see a non paging IRP_MJ_SET_INFORMATION. Now what I do is I read the entire contents of the file, then insert my header and next write the contents back into the file. This seems to be a cumbersome process. I think I am doing something wrong out here.
~ganesh