PROOFChecksum.ckp.e1: def of bend-osdev-acpi@0.1.2.0
Import: import bend-osdev-acpi@0.1.2.0/PROOF_checksum.bend as PROOFChecksum
Lines 260-262 of bend-osdev-acpi@0.1.2.0/PROOF_checksum.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-acpi@0.1.2.0/PROOF_checksum.bend&start_line=260&end_line=262

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

def 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}:
  %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}
  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))

Uses (21):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe.default
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_lt
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-acpi@0.1.2.0/PROOF_checksum.bend&name=ckp.e1g
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-acpi@0.1.2.0/PROOF_checksum.bend&name=ckp.ns
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-acpi@0.1.2.0/PROOF_checksum.bend&name=ckp.split
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-acpi@0.1.2.0/PROOF_checksum.bend&name=ckp.sumv
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-acpi@0.1.2.0/checksum.bend&name=AcpiChecksum.sum
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=Octets
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=Octets.at
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=Octets.drop
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=Octets.len
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=Octets.take
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.1/bytes.bend&name=Octets.to_list
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-u32@0.1.0.0/u32.bend&name=U32Nat.low