Packed.len_hi: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/spec/crypto/sha/packed.bend as Packed
Lines 5-17 of bend-collections@1.0.0.0/spec/crypto/sha/packed.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/spec/crypto/sha/packed.bend&start_line=5&end_line=17

import Base
import bend-collections@1.0.0.0/spec/crypto/sha.bend as F

# Packed-format reference: logical input byte j is the big-endian byte j%4
# of array word floor(j/4). Only the declared prefix is part of the message.
# Block collection uses a generic list reader, not the optimized 16-read chain.
def len_hi(+n: Nat) -> U32:
  +d0 = Nat.div(n, 32n)
  +d1 = Nat.div(d0, 256n)
  +d2 = Nat.div(d1, 256n)
  +d3 = Nat.div(d2, 256n)
  +d4 = Nat.div(d3, 256n)
  +d5 = Nat.div(d4, 256n)
  +d6 = Nat.div(d5, 256n)
  F.decode(U32.from_nat(Nat.mod(d6, 256n)), U32.from_nat(Nat.mod(d5, 256n)),
    U32.from_nat(Nat.mod(d4, 256n)), U32.from_nat(Nat.mod(d3, 256n)))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.div
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.mod
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.from_nat
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/spec/crypto/sha.bend&name=decode