{ lib, pkgs, depot, ... }: let toNetstring = depot.nix.netstring.fromString; toNetstringList = xs: lib.concatStrings (map toNetstring xs); toNetstringKeyVal = depot.nix.netstring.attrsToKeyValList; python-netstring = depot.users.Profpatsch.writers.python3Lib { name = "netstring"; } '' def read_netstring(bytes): (int_length, rest) = bytes.split(sep=b':', maxsplit=1) val = rest[:int(int_length)] # has to end on a , assert(rest[len(val)] == ord(',')) return (val, rest[len(val) + 1:]) def read_netstring_key_val(bytes): (keyvalnet, rest) = read_netstring(bytes) (key, valnet) = read_netstring(keyvalnet) (val, nothing) = read_netstring(valnet) assert(nothing == b"") return (key, val, rest) def read_netstring_key_val_list(bytes): rest = bytes res = {} while rest != b"": (key, val, r) = read_netstring_key_val(rest) rest = r res[key] = val return res ''; rust-netstring = depot.nix.writers.rustSimpleLib { name = "netstring"; } '' pub fn to_netstring(s: &[u8]) -> Vec<u8> { let len = s.len(); // length of the integer as ascii let i_len = ((len as f64).log10() as usize) + 1; let ns_len = i_len + 1 + len + 1; let mut res = Vec::with_capacity(ns_len); res.extend_from_slice(format!("{}:", len).as_bytes()); res.extend_from_slice(s); res.push(b','); res } ''; in depot.nix.readTree.drvTargets { inherit toNetstring toNetstringList toNetstringKeyVal python-netstring rust-netstring ; }