ipld-car 0.1.0

DAG-PB serialization/deserialization library for IPFS CAR v1 archives
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

use std::{
	convert::Infallible,
	fs::File,
	io::{self, BufReader, BufWriter, IntoInnerError, Read, Write},
};

use bytes::{
	buf::{Reader as BytesReader, Writer as BytesWriter},
	Buf, BufMut, BytesMut,
};

/// It facilitates the transform from `Write` to `Read` and bise versa
pub trait RWTransmuter {
	type Writer: Write + RWTransmuter;
	type Reader: Read;
	type IntoWriterErr;
	type IntoReaderErr;

	fn temporal() -> io::Result<Self>
	where
		Self: Sized;

	fn into_writer(self) -> Result<Self::Writer, Self::IntoWriterErr>
	where
		Self: Sized;

	fn into_reader(self) -> Result<Self::Reader, Self::IntoReaderErr>
	where
		Self: Sized;
}

impl RWTransmuter for File {
	type Writer = File;
	type Reader = File;
	type IntoWriterErr = Infallible;
	type IntoReaderErr = Infallible;

	fn temporal() -> io::Result<Self> {
		tempfile::tempfile()
	}

	fn into_writer(self) -> Result<Self::Writer, Self::IntoWriterErr> {
		Ok(self)
	}

	fn into_reader(self) -> Result<Self::Reader, Self::IntoReaderErr> {
		Ok(self)
	}
}

impl<F: RWTransmuter + Write + Read> RWTransmuter for BufReader<F> {
	type Writer = BufWriter<F>;
	type Reader = BufReader<F>;
	type IntoWriterErr = Infallible;
	type IntoReaderErr = Infallible;

	fn temporal() -> io::Result<Self> {
		F::temporal().map(BufReader::new)
	}

	fn into_writer(self) -> Result<Self::Writer, Self::IntoWriterErr> {
		Ok(BufWriter::new(self.into_inner()))
	}

	fn into_reader(self) -> Result<Self::Reader, Self::IntoReaderErr> {
		Ok(self)
	}
}

impl<F: RWTransmuter + Write + Read> RWTransmuter for BufWriter<F> {
	type Writer = BufWriter<F>;
	type Reader = BufReader<F>;
	type IntoWriterErr = Infallible;
	type IntoReaderErr = IntoInnerError<Self>;

	fn temporal() -> io::Result<Self> {
		F::temporal().map(BufWriter::new)
	}

	fn into_writer(self) -> Result<Self::Writer, Self::IntoWriterErr> {
		Ok(self)
	}

	fn into_reader(self) -> Result<Self::Reader, Self::IntoReaderErr> {
		self.into_inner().map(BufReader::new)
	}
}

impl RWTransmuter for BytesMut {
	type Writer = BytesWriter<BytesMut>;
	type Reader = BytesReader<BytesMut>;
	type IntoWriterErr = Infallible;
	type IntoReaderErr = Infallible;

	fn temporal() -> io::Result<Self> {
		Ok(BytesMut::new())
	}

	fn into_writer(self) -> Result<Self::Writer, Self::IntoWriterErr> {
		Ok(self.writer())
	}

	fn into_reader(self) -> Result<Self::Reader, Self::IntoReaderErr> {
		Ok(self.reader())
	}
}

impl RWTransmuter for BytesWriter<BytesMut> {
	type Writer = BytesWriter<BytesMut>;
	type Reader = BytesReader<BytesMut>;
	type IntoWriterErr = Infallible;
	type IntoReaderErr = Infallible;

	fn temporal() -> io::Result<Self> {
		Ok(BytesMut::new().writer())
	}

	fn into_writer(self) -> Result<Self::Writer, Self::IntoWriterErr> {
		Ok(self)
	}

	fn into_reader(self) -> Result<Self::Reader, Self::IntoReaderErr> {
		Ok(self.into_inner().reader())
	}
}

impl RWTransmuter for BytesReader<BytesMut> {
	type Writer = BytesWriter<BytesMut>;
	type Reader = BytesReader<BytesMut>;
	type IntoWriterErr = Infallible;
	type IntoReaderErr = Infallible;

	fn temporal() -> io::Result<Self> {
		Ok(BytesMut::new().reader())
	}

	fn into_writer(self) -> Result<Self::Writer, Self::IntoWriterErr> {
		Ok(self.into_inner().writer())
	}

	fn into_reader(self) -> Result<Self::Reader, Self::IntoReaderErr> {
		Ok(self)
	}
}