deno_web 0.210.0

Collection of Web APIs
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
140
141
142
143
144
145
146
147
148

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.

use deno_core::op2;
use flate2::write::DeflateDecoder;
use flate2::write::DeflateEncoder;
use flate2::write::GzDecoder;
use flate2::write::GzEncoder;
use flate2::write::ZlibDecoder;
use flate2::write::ZlibEncoder;
use flate2::Compression;
use std::cell::RefCell;
use std::io::Write;

#[derive(Debug, thiserror::Error)]
pub enum CompressionError {
  #[error("Unsupported format")]
  UnsupportedFormat,
  #[error("resource is closed")]
  ResourceClosed,
  #[error(transparent)]
  IoTypeError(std::io::Error),
  #[error(transparent)]
  Io(std::io::Error),
}

#[derive(Debug)]
struct CompressionResource(RefCell<Option<Inner>>);

impl deno_core::GarbageCollected for CompressionResource {}

/// https://wicg.github.io/compression/#supported-formats
#[derive(Debug)]
enum Inner {
  DeflateDecoder(ZlibDecoder<Vec<u8>>),
  DeflateEncoder(ZlibEncoder<Vec<u8>>),
  DeflateRawDecoder(DeflateDecoder<Vec<u8>>),
  DeflateRawEncoder(DeflateEncoder<Vec<u8>>),
  GzDecoder(GzDecoder<Vec<u8>>),
  GzEncoder(GzEncoder<Vec<u8>>),
}

#[op2]
#[cppgc]
pub fn op_compression_new(
  #[string] format: &str,
  is_decoder: bool,
) -> Result<CompressionResource, CompressionError> {
  let w = Vec::new();
  let inner = match (format, is_decoder) {
    ("deflate", true) => Inner::DeflateDecoder(ZlibDecoder::new(w)),
    ("deflate", false) => {
      Inner::DeflateEncoder(ZlibEncoder::new(w, Compression::default()))
    }
    ("deflate-raw", true) => Inner::DeflateRawDecoder(DeflateDecoder::new(w)),
    ("deflate-raw", false) => {
      Inner::DeflateRawEncoder(DeflateEncoder::new(w, Compression::default()))
    }
    ("gzip", true) => Inner::GzDecoder(GzDecoder::new(w)),
    ("gzip", false) => {
      Inner::GzEncoder(GzEncoder::new(w, Compression::default()))
    }
    _ => return Err(CompressionError::UnsupportedFormat),
  };
  Ok(CompressionResource(RefCell::new(Some(inner))))
}

#[op2]
#[buffer]
pub fn op_compression_write(
  #[cppgc] resource: &CompressionResource,
  #[anybuffer] input: &[u8],
) -> Result<Vec<u8>, CompressionError> {
  let mut inner = resource.0.borrow_mut();
  let inner = inner.as_mut().ok_or(CompressionError::ResourceClosed)?;
  let out: Vec<u8> = match &mut *inner {
    Inner::DeflateDecoder(d) => {
      d.write_all(input).map_err(CompressionError::IoTypeError)?;
      d.flush().map_err(CompressionError::Io)?;
      d.get_mut().drain(..)
    }
    Inner::DeflateEncoder(d) => {
      d.write_all(input).map_err(CompressionError::IoTypeError)?;
      d.flush().map_err(CompressionError::Io)?;
      d.get_mut().drain(..)
    }
    Inner::DeflateRawDecoder(d) => {
      d.write_all(input).map_err(CompressionError::IoTypeError)?;
      d.flush().map_err(CompressionError::Io)?;
      d.get_mut().drain(..)
    }
    Inner::DeflateRawEncoder(d) => {
      d.write_all(input).map_err(CompressionError::IoTypeError)?;
      d.flush().map_err(CompressionError::Io)?;
      d.get_mut().drain(..)
    }
    Inner::GzDecoder(d) => {
      d.write_all(input).map_err(CompressionError::IoTypeError)?;
      d.flush().map_err(CompressionError::Io)?;
      d.get_mut().drain(..)
    }
    Inner::GzEncoder(d) => {
      d.write_all(input).map_err(CompressionError::IoTypeError)?;
      d.flush().map_err(CompressionError::Io)?;
      d.get_mut().drain(..)
    }
  }
  .collect();
  Ok(out)
}

#[op2]
#[buffer]
pub fn op_compression_finish(
  #[cppgc] resource: &CompressionResource,
  report_errors: bool,
) -> Result<Vec<u8>, CompressionError> {
  let inner = resource
    .0
    .borrow_mut()
    .take()
    .ok_or(CompressionError::ResourceClosed)?;
  let out = match inner {
    Inner::DeflateDecoder(d) => {
      d.finish().map_err(CompressionError::IoTypeError)
    }
    Inner::DeflateEncoder(d) => {
      d.finish().map_err(CompressionError::IoTypeError)
    }
    Inner::DeflateRawDecoder(d) => {
      d.finish().map_err(CompressionError::IoTypeError)
    }
    Inner::DeflateRawEncoder(d) => {
      d.finish().map_err(CompressionError::IoTypeError)
    }
    Inner::GzDecoder(d) => d.finish().map_err(CompressionError::IoTypeError),
    Inner::GzEncoder(d) => d.finish().map_err(CompressionError::IoTypeError),
  };
  match out {
    Err(err) => {
      if report_errors {
        Err(err)
      } else {
        Ok(Vec::with_capacity(0))
      }
    }
    Ok(out) => Ok(out),
  }
}