imdl 0.1.16

📦 A 40' shipping container for the internet
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139

use crate::common::*;

pub(crate) struct Hasher {
  buffer: Vec<u8>,
  length: u64,
  md5sum: bool,
  piece_bytes_hashed: usize,
  piece_length: usize,
  pieces: PieceList,
  sha1: Sha1,
  progress_bar: Option<ProgressBar>,
}

impl Hasher {
  pub(crate) fn new(md5sum: bool, piece_length: usize, progress_bar: Option<ProgressBar>) -> Self {
    Self {
      buffer: vec![0; piece_length],
      length: 0,
      piece_bytes_hashed: 0,
      pieces: PieceList::new(),
      sha1: Sha1::new(),
      piece_length,
      md5sum,
      progress_bar,
    }
  }

  pub(crate) fn hash_files(mut self, files: &Files) -> Result<(Mode, PieceList), Error> {
    let mode = if let Some(contents) = files.contents() {
      let files = self.hash_contents(files.root(), contents)?;

      Mode::Multiple { files }
    } else {
      let (md5sum, length) = self.hash_file(files.root())?;

      Mode::Single { md5sum, length }
    };

    self.finish();

    Ok((mode, self.pieces))
  }

  pub(crate) fn hash_stdin(mut self, stdin: &mut dyn BufRead) -> Result<(Mode, PieceList), Error> {
    let (md5sum, length) = self.hash_read_io(stdin).context(error::Stdin)?;

    let mode = Mode::Single { md5sum, length };

    self.finish();

    Ok((mode, self.pieces))
  }

  fn finish(&mut self) {
    if self.piece_bytes_hashed > 0 {
      self.pieces.push(self.sha1.digest().into());
      self.sha1.reset();
      self.piece_bytes_hashed = 0;
    }
  }

  fn hash_contents(
    &mut self,
    root: &Path,
    file_paths: &[FilePath],
  ) -> Result<Vec<FileInfo>, Error> {
    let mut files = Vec::new();

    for file_path in file_paths {
      let path = file_path.absolute(root);

      let (md5sum, length) = self.hash_file(&path)?;

      files.push(FileInfo {
        path: file_path.clone(),
        md5sum,
        length,
      });
    }

    Ok(files)
  }

  fn hash_file(&mut self, path: &Path) -> Result<(Option<Md5Digest>, Bytes), Error> {
    let file = File::open(path).context(error::Filesystem { path })?;

    self
      .hash_read_io(&mut BufReader::new(file))
      .context(error::Filesystem { path })
  }

  fn hash_read_io(&mut self, file: &mut dyn BufRead) -> io::Result<(Option<Md5Digest>, Bytes)> {
    let mut bytes_hashed = 0;

    let mut md5 = if self.md5sum {
      Some(md5::Context::new())
    } else {
      None
    };

    loop {
      let remaining = &mut self.buffer[..self.piece_length - self.piece_bytes_hashed];

      let bytes_read = file.read(remaining)?;

      if bytes_read == 0 {
        break;
      }

      let read = &remaining[..bytes_read];

      self.sha1.update(read);

      bytes_hashed += bytes_read;
      self.piece_bytes_hashed += bytes_read;

      if self.piece_bytes_hashed == self.piece_length {
        self.pieces.push(self.sha1.digest().into());
        self.sha1.reset();
        self.piece_bytes_hashed = 0;
      }

      if let Some(md5) = md5.as_mut() {
        md5.consume(read);
      }

      if let Some(progress_bar) = &self.progress_bar {
        progress_bar.inc(bytes_read.into_u64());
      }
    }

    self.length += bytes_hashed.into_u64();

    Ok((
      md5.map(|context| context.finalize().into()),
      Bytes::from(bytes_hashed.into_u64()),
    ))
  }
}