Four sequential bytes; Need to remove high order bit in each to get correct output

[GrandSean]

I am writing program to manipulate the contents of an .MP3 file. In reading the header in
binary(byte) mode, decoding the header Size field is giving me problems. See ID3.org. The definition
of the field is
ID3v2 size = 4 * %0xxxxxxx

I have been away from programming for about 15 years and need to relearn the basics.

Not looking for code here, just a pointer on how to remove 4 bits from the inside of the field.



Thanks,

GrandSean