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annotate src/util/bitstream.rs @ 637:afa012bb8021

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Hello Rust!
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 03 Jul 2019 16:27:12 +0200
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637
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1 //! Bitstream module.
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2
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3 use std::io;
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4
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5 /// Wrapper around any `Read` trait, to allow bit operations.
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6 pub struct BitStream<R: io::Read + io::Seek> {
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7 io: R,
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8 remaining_bits: usize,
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9 byte: u8,
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10 }
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11
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12 impl<R: io::Read + io::Seek> BitStream<R> {
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13 /// Create a new bitstream.
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14 pub fn new(io: R) -> BitStream<R> {
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15 BitStream {
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16 io,
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17 remaining_bits: 0,
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18 byte: 0,
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19 }
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20 }
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21
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22 /// Seek inside the bitstream, ditching any unused data read.
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23 pub fn seek(&mut self, seek_from: io::SeekFrom) -> io::Result<u64> {
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24 self.remaining_bits = 0;
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25 self.byte = 0;
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26 self.io.seek(seek_from)
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27 }
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28
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29 fn fill_byte(&mut self) -> io::Result<()> {
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30 assert!(self.remaining_bits == 0);
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31
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32 let mut buf = [0u8; 1];
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33 self.io.read_exact(&mut buf)?;
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34 self.byte = buf[0];
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35 self.remaining_bits = 8;
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36 Ok(())
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37 }
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38
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39 /// Read only one bit from the stream.
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40 pub fn read_bit(&mut self) -> io::Result<bool> {
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41 if self.remaining_bits == 0 {
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42 self.fill_byte()?;
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43 }
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44 self.remaining_bits -= 1;
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45 Ok((self.byte >> self.remaining_bits) & 0x01 != 0)
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46 }
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47
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48 /// Read `nb_bits` bits from the stream.
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49 pub fn read(&mut self, nb_bits: usize) -> io::Result<usize> {
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50 let mut nb_bits2 = nb_bits;
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51 let mut value: usize = 0;
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52 while nb_bits2 > 0 {
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53 if self.remaining_bits == 0 {
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54 self.fill_byte()?;
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55 }
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56 let read = if nb_bits2 > self.remaining_bits { self.remaining_bits } else { nb_bits2 };
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57 nb_bits2 -= read;
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58 self.remaining_bits -= read;
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59 value |= (self.byte as usize >> self.remaining_bits) << nb_bits2;
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60 }
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61 Ok(value & ((1 << nb_bits) - 1))
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62 }
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63
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64 /// Read a given amount of bytes.
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65 pub fn read_bytes(&mut self, nb_bytes: usize) -> io::Result<Vec<u8>> {
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66 let mut buf = vec![0u8; nb_bytes];
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67 self.io.read_exact(&mut buf)?;
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68 Ok(buf)
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69 }
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70 }
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71
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72 #[cfg(test)]
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73 mod tests {
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74 use super::*;
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75 use crate::util::SeekableSlice;
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76
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77 #[test]
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78 fn bit_by_bit() {
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79 let data = SeekableSlice::new(&[1, 2, 3]);
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80 let mut bitstream = BitStream::new(data);
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81
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82 // 1
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83 assert_eq!(bitstream.read_bit().unwrap(), false);
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84 assert_eq!(bitstream.read_bit().unwrap(), false);
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85 assert_eq!(bitstream.read_bit().unwrap(), false);
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86 assert_eq!(bitstream.read_bit().unwrap(), false);
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87 assert_eq!(bitstream.read_bit().unwrap(), false);
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88 assert_eq!(bitstream.read_bit().unwrap(), false);
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89 assert_eq!(bitstream.read_bit().unwrap(), false);
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90 assert_eq!(bitstream.read_bit().unwrap(), true);
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91
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92 // 2
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93 assert_eq!(bitstream.read_bit().unwrap(), false);
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94 assert_eq!(bitstream.read_bit().unwrap(), false);
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95 assert_eq!(bitstream.read_bit().unwrap(), false);
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96 assert_eq!(bitstream.read_bit().unwrap(), false);
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97 assert_eq!(bitstream.read_bit().unwrap(), false);
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98 assert_eq!(bitstream.read_bit().unwrap(), false);
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99 assert_eq!(bitstream.read_bit().unwrap(), true);
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100 assert_eq!(bitstream.read_bit().unwrap(), false);
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101
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102 // 3
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103 assert_eq!(bitstream.read_bit().unwrap(), false);
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104 assert_eq!(bitstream.read_bit().unwrap(), false);
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105 assert_eq!(bitstream.read_bit().unwrap(), false);
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106 assert_eq!(bitstream.read_bit().unwrap(), false);
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107 assert_eq!(bitstream.read_bit().unwrap(), false);
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108 assert_eq!(bitstream.read_bit().unwrap(), false);
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109 assert_eq!(bitstream.read_bit().unwrap(), true);
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110 assert_eq!(bitstream.read_bit().unwrap(), true);
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111
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112 // Can’t read after the end.
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113 bitstream.read_bit().unwrap_err();
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114 }
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115
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116 #[test]
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117 fn byte_by_byte() {
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118 let data = SeekableSlice::new(&[1, 2, 3]);
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119 let mut bitstream = BitStream::new(data);
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120
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121 assert_eq!(bitstream.read(8).unwrap(), 1);
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122 assert_eq!(bitstream.read(8).unwrap(), 2);
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123 assert_eq!(bitstream.read(8).unwrap(), 3);
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124
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125 // Can’t read after the end.
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126 bitstream.read(1).unwrap_err();
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127 }
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128
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129 #[test]
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130 fn unaligned_bytes() {
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131 let data = SeekableSlice::new(&[0, 129, 1, 128]);
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132 let mut bitstream = BitStream::new(data);
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133
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134 assert_eq!(bitstream.read_bit().unwrap(), false);
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135 assert_eq!(bitstream.read(8).unwrap(), 1);
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136 assert_eq!(bitstream.read(8).unwrap(), 2);
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137 assert_eq!(bitstream.read(8).unwrap(), 3);
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138 assert_eq!(bitstream.read(7).unwrap(), 0);
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139
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140 // Can’t read after the end.
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141 bitstream.read(1).unwrap_err();
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142 }
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143 }