Mercurial > touhou

annotate src/util/bitstream.rs @ 702:718348c7608e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
anm0: simplify parsing with more combinators.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Fri, 23 Aug 2019 17:22:38 +0200
parents afa012bb8021
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
637
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
1 //! Bitstream module.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
2
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
3 use std::io;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
4
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
5 /// Wrapper around any `Read` trait, to allow bit operations.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
6 pub struct BitStream<R: io::Read + io::Seek> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
7 io: R,
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
8 remaining_bits: usize,
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
9 byte: u8,
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
10 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
11
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
12 impl<R: io::Read + io::Seek> BitStream<R> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
13 /// Create a new bitstream.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
14 pub fn new(io: R) -> BitStream<R> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
15 BitStream {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
16 io,
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
17 remaining_bits: 0,
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
18 byte: 0,
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
19 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
20 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
21
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
22 /// Seek inside the bitstream, ditching any unused data read.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
23 pub fn seek(&mut self, seek_from: io::SeekFrom) -> io::Result<u64> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
24 self.remaining_bits = 0;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
25 self.byte = 0;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
26 self.io.seek(seek_from)
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
27 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
28
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
29 fn fill_byte(&mut self) -> io::Result<()> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
30 assert!(self.remaining_bits == 0);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
31
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
32 let mut buf = [0u8; 1];
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
33 self.io.read_exact(&mut buf)?;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
34 self.byte = buf[0];
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
35 self.remaining_bits = 8;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
36 Ok(())
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
37 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
38
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
39 /// Read only one bit from the stream.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
40 pub fn read_bit(&mut self) -> io::Result<bool> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
41 if self.remaining_bits == 0 {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
42 self.fill_byte()?;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
43 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
44 self.remaining_bits -= 1;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
45 Ok((self.byte >> self.remaining_bits) & 0x01 != 0)
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
46 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
47
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
48 /// Read `nb_bits` bits from the stream.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
49 pub fn read(&mut self, nb_bits: usize) -> io::Result<usize> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
50 let mut nb_bits2 = nb_bits;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
51 let mut value: usize = 0;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
52 while nb_bits2 > 0 {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
53 if self.remaining_bits == 0 {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
54 self.fill_byte()?;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
55 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
56 let read = if nb_bits2 > self.remaining_bits { self.remaining_bits } else { nb_bits2 };
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
57 nb_bits2 -= read;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
58 self.remaining_bits -= read;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
59 value |= (self.byte as usize >> self.remaining_bits) << nb_bits2;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
60 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
61 Ok(value & ((1 << nb_bits) - 1))
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
62 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
63
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
64 /// Read a given amount of bytes.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
65 pub fn read_bytes(&mut self, nb_bytes: usize) -> io::Result<Vec<u8>> {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
66 let mut buf = vec![0u8; nb_bytes];
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
67 self.io.read_exact(&mut buf)?;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
68 Ok(buf)
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
69 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
70 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
71
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
72 #[cfg(test)]
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
73 mod tests {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
74 use super::*;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
75 use crate::util::SeekableSlice;
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
76
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
77 #[test]
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
78 fn bit_by_bit() {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
79 let data = SeekableSlice::new(&[1, 2, 3]);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
80 let mut bitstream = BitStream::new(data);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
81
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
82 // 1
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
83 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
84 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
85 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
86 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
87 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
88 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
89 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
90 assert_eq!(bitstream.read_bit().unwrap(), true);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
91
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
92 // 2
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
93 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
94 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
95 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
96 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
97 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
98 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
99 assert_eq!(bitstream.read_bit().unwrap(), true);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
100 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
101
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
102 // 3
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
103 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
104 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
105 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
106 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
107 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
108 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
109 assert_eq!(bitstream.read_bit().unwrap(), true);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
110 assert_eq!(bitstream.read_bit().unwrap(), true);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
111
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
112 // Can’t read after the end.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
113 bitstream.read_bit().unwrap_err();
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
114 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
115
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
116 #[test]
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
117 fn byte_by_byte() {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
118 let data = SeekableSlice::new(&[1, 2, 3]);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
119 let mut bitstream = BitStream::new(data);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
120
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
121 assert_eq!(bitstream.read(8).unwrap(), 1);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
122 assert_eq!(bitstream.read(8).unwrap(), 2);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
123 assert_eq!(bitstream.read(8).unwrap(), 3);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
124
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
125 // Can’t read after the end.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
126 bitstream.read(1).unwrap_err();
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
127 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
128
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
129 #[test]
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
130 fn unaligned_bytes() {
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
131 let data = SeekableSlice::new(&[0, 129, 1, 128]);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
132 let mut bitstream = BitStream::new(data);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
133
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
134 assert_eq!(bitstream.read_bit().unwrap(), false);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
135 assert_eq!(bitstream.read(8).unwrap(), 1);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
136 assert_eq!(bitstream.read(8).unwrap(), 2);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
137 assert_eq!(bitstream.read(8).unwrap(), 3);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
138 assert_eq!(bitstream.read(7).unwrap(), 0);
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
139
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
140 // Can’t read after the end.
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
141 bitstream.read(1).unwrap_err();
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
142 }
afa012bb8021 Hello Rust!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
143 }