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use std
use bio

const main = {
	var f
	/* Must be bigger than a bio buffer (ie, > 64k) */
	var buf : byte[64*1024]

	match bio.open("data/datafile", bio.Rd)
	| `std.Some bio:	f = bio
	| `std.None:	std.fatal(1, "Unable to open data file")
	;;
	
	std.assert(peekb(f) == 0x30, "wrong byte value read from datafile")
	std.assert(peekc(f) == '0', "wrong char value read from datafile")

	bio.read(f, buf[:4])	/* skip ahead 4 bytes */
	std.assert(peekb(f) == 0x34, "wrong byte value read from datafile")
	std.assert(peekc(f) == '4', "wrong char value read from datafile")

	bio.read(f, buf[:])	/* skip ahead 64k */
	std.assert(peekb(f) == 0x30, "wrong byte value read from datafile")
	std.assert(peekc(f) == '0', "wrong char value read from datafile")

	bio.close(f);
	std.put("Succeded peeeking values\n")
}

const peekc = {f
	match bio.peekc(f)
	| `std.Some c:	-> c
	| `std.None:
		std.put("eof")
		-> -1
	;;
}

const peekb = {f
	match bio.peekb(f)
	| `std.Some b:	-> b
	| `std.None:
		std.put("eof")
		-> -1
	;;
}