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If the data can include any byte values, I don't see how you can tell when a byte is data or when a byte is whitespace.
Are you sure the data bytes have values from 0 to 255?
Or is the data...

How can you tell difference between a byte with image data and a byte with a whitespace,
If the image data values can be from 0 to 255?

Why are there newline characters mixed in with the bytes that can contain any value from 0 to 255?

Are any of the values of the bytes the same as the newline('\n') character's value?

What is the value of Maxval? byte variables are signed so the max (positive) value a byte can hold is 127 (0x7F) If the high order bit of the byte is a 1, the value of the byte will be negative.