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annotate src/util/mod.rs @ 646:7d92730bf543

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Add a PRNG and use it for anm0 instruction 16.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sat, 03 Aug 2019 23:30:15 +0200
parents 01849ffd0180
children
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1 //! Module containing a bunch of helper modules.
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2
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3 pub mod bitstream;
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4 pub mod lzss;
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5 pub mod math;
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6 pub mod prng;
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7
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8 #[cfg(test)]
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9 use std::io;
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10
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11 #[cfg(test)]
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12 pub struct SeekableSlice<'a> {
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13 slice: &'a [u8],
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14 cursor: usize,
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15 }
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16
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17 #[cfg(test)]
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18 impl SeekableSlice<'_> {
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19 pub fn new(slice: &[u8]) -> SeekableSlice {
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20 SeekableSlice {
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21 slice,
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22 cursor: 0,
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23 }
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24 }
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25 }
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26
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27 #[cfg(test)]
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28 impl io::Read for SeekableSlice<'_> {
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29 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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30 let length = (&self.slice[self.cursor..]).read(buf)?;
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31 self.cursor += length;
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32 Ok(length)
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33 }
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34 }
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35
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36 #[cfg(test)]
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37 impl io::Seek for SeekableSlice<'_> {
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38 fn seek(&mut self, seek_from: io::SeekFrom) -> io::Result<u64> {
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39 match seek_from {
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40 io::SeekFrom::Start(offset) => {
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41 self.cursor = offset as usize;
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42 }
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43 io::SeekFrom::End(offset) => {
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44 self.cursor = (self.slice.len() as i64 + offset) as usize;
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45 }
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46 io::SeekFrom::Current(offset) => {
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47 self.cursor = (self.cursor as i64 + offset) as usize;
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48 }
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49 }
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50 Ok(self.cursor as u64)
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51 }
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52 }