def ckp.e1

bend-osdev-acpi@0.1.2.0 · PROOF_checksum.bend:260

import Base
import bend-osdev-bytes@0.1.1.1/bytes.bend as B
import bend-osdev-u32@0.1.0.0/u32.bend as U
import bend-osdev-acpi@0.1.2.0/checksum.bend as C

260def ckp.e1(+i: Nat, +o: B.Octets, +h: {Nat.is_lt(i, B.Octets.len(o)) == True{} : Bool}) -> {U.U32Nat.low(8n, Nat.add(U32.to_nat(U32.and(255, U32.sub(C.AcpiChecksum.sum(o), U32.and(255, Maybe.default(&2, U32, B.Octets.at(o, i), 0))))), U32.to_nat(U32.and(255, Maybe.default(&2, U32, B.Octets.at(o, i), 0))))) == U.U32Nat.low(8n, Nat.add(ckp.ns(B.Octets.to_list(B.Octets.take(i, o))), Nat.add(U32.to_nat(U32.and(255, Maybe.default(&2, U32, B.Octets.at(o, i), 0))), ckp.ns(B.Octets.to_list(B.Octets.drop(1n+i, o)))))) : Nat}:
261  %ckp.split(i, o, h) : {U.U32Nat.low(8n, Nat.add(U32.to_nat(U32.and(255, U32.sub(C.AcpiChecksum.sum(o), U32.and(255, Maybe.default(&2, U32, B.Octets.at(o, i), 0))))), U32.to_nat(U32.and(255, Maybe.default(&2, U32, B.Octets.at(o, i), 0))))) == U.U32Nat.low(8n, _) : Nat}
262  ckp.e1g(C.AcpiChecksum.sum(o), U32.and(255, Maybe.default(&2, U32, B.Octets.at(o, i), 0)), ckp.ns(B.Octets.to_list(o)), ckp.sumv(o))