def inflate.distance.extra

gralha-bytes@0.1.0.1 · bytes.bend:233

import Base
import gralha-text-scan@0.1.0.1/scan.bend as U

233def inflate.distance.extra(read: BitRead, +length: U32, +base: U32, +out: Bytes, limit: U32) -> Inflate:
234  BitRead{extra, stream} = read
235  +input = stream
236  +distance = (base + extra : U32)
237  U.branch(Inflate, bits.valid(input) && U32.is_gt(distance, 0) && U32.is_le(distance, bytes.size(out)) && U32.is_le(length, (limit - bytes.size(out) : U32)),
238    _ => Inflate{input, inflate.copy(U32.to_nat(length), distance, out)}, _ => Inflate{bits.invalid(input), out})