2019-09-06 11:20:40 +00:00
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use crate::{Error, ErrorKind, Result};
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use std::fmt;
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use std::str::{self, FromStr};
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use trackable::error::ErrorKindExt;
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/// Byte range.
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///
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/// See: [4.3.2.2. EXT-X-BYTERANGE]
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///
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/// [4.3.2.2. EXT-X-BYTERANGE]: https://tools.ietf.org/html/rfc8216#section-4.3.2.2
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#[allow(missing_docs)]
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub struct ByteRange {
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pub length: usize,
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pub start: Option<usize>,
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}
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impl fmt::Display for ByteRange {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.length)?;
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if let Some(x) = self.start {
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write!(f, "@{}", x)?;
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}
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Ok(())
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}
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}
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impl FromStr for ByteRange {
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type Err = Error;
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fn from_str(s: &str) -> Result<Self> {
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let mut tokens = s.splitn(2, '@');
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let length = tokens.next().expect("Never fails");
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let start = if let Some(start) = tokens.next() {
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Some(track!(start
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.parse()
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.map_err(|e| ErrorKind::InvalidInput.cause(e)))?)
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} else {
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None
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};
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Ok(ByteRange {
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length: track!(length.parse().map_err(|e| ErrorKind::InvalidInput.cause(e)))?,
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start,
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})
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}
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}
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2019-09-06 11:46:21 +00:00
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_display() {
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let byte_range = ByteRange {
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length: 0,
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start: Some(5),
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};
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assert_eq!(byte_range.to_string(), "0@5".to_string());
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let byte_range = ByteRange {
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length: 99999,
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start: Some(2),
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};
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assert_eq!(byte_range.to_string(), "99999@2".to_string());
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let byte_range = ByteRange {
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length: 99999,
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start: None,
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};
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assert_eq!(byte_range.to_string(), "99999".to_string());
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}
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#[test]
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fn test_parse() {
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let byte_range = ByteRange {
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length: 99999,
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start: Some(2),
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};
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assert_eq!(byte_range, "99999@2".parse::<ByteRange>().unwrap());
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let byte_range = ByteRange {
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length: 99999,
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start: Some(2),
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};
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assert_eq!(byte_range, "99999@2".parse::<ByteRange>().unwrap());
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let byte_range = ByteRange {
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length: 99999,
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start: None,
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};
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assert_eq!(byte_range, "99999".parse::<ByteRange>().unwrap());
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}
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}
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