5a1de1acd2
When no piece length is provided to imdl torrent create, a piece length is selected based on the size of the input. The hueristic is lifted directly from libtorrent. Also adds a imdl torrent piece-length command, which prints a table of the piece lengths chosen at different content sizes, which is useful for understanding and debugging the piece length selection algorithm. type: added
68 lines
1.6 KiB
Rust
68 lines
1.6 KiB
Rust
use crate::common::*;
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#[derive(StructOpt)]
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#[structopt(
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help_message(consts::HELP_MESSAGE),
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version_message(consts::VERSION_MESSAGE),
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about("Display information about automatic piece length selection.")
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)]
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pub(crate) struct PieceLength {}
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#[allow(clippy::unused_self)]
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impl PieceLength {
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pub(crate) fn run(self, env: &mut Env) -> Result<(), Error> {
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let mut rows: Vec<(String, String, String, String)> = Vec::new();
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rows.push((
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"Content".into(),
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"Piece Length".into(),
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"Count".into(),
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"Metainfo Size".into(),
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));
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for i in 14..51 {
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let content_size = Bytes::from(1u128 << i);
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let piece_length = PieceLengthPicker::from_content_size(content_size);
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let metainfo_size = PieceLengthPicker::metainfo_size(content_size, piece_length);
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let piece_count = PieceLengthPicker::piece_count(content_size, piece_length);
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rows.push((
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content_size.to_string(),
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piece_length.to_string(),
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piece_count.to_string(),
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metainfo_size.to_string(),
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));
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}
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let mut w = (0, 0, 0, 0);
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for (c0, c1, c2, c3) in &rows {
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w = (
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w.0.max(c0.len()),
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w.1.max(c1.len()),
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w.2.max(c2.len()),
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w.3.max(c3.len()),
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);
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}
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for (content_size, piece_length, metainfo_size, piece_count) in rows {
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outln!(
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env,
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"{:w0$} -> {:w1$} x {:w2$} = {:w3$}",
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content_size,
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piece_length,
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metainfo_size,
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piece_count,
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w0 = w.0,
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w1 = w.1,
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w2 = w.2,
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w3 = w.3,
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);
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}
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Ok(())
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}
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}
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