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webmetro
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Shrink EbmlSlice trait implementations

This commit is contained in:
Tangent 128 2018-04-04 00:12:55 -04:00
parent 2db227c5f9
commit ee068bc887
1 changed files with 19 additions and 44 deletions
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63
src/iterator.rs
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@ -10,30 +10,15 @@ impl<'a> Iterator for EbmlSlice<'a> {
type Item = WebmElement<'a>;
fn next(&mut self) -> Option<WebmElement<'a>> {
match WebmElement::check_space(self.0) {
Err(err) => {
None
},
Ok(None) => {
None
},
Ok(Some(element_size)) => {
let (element_data, rest) = self.0.split_at(element_size);
self.0 = rest;
match WebmElement::decode_element(element_data) {
Err(err) => {
None
},
Ok(None) => {
// buffer should have enough data
panic!("Buffer was supposed to have enough data to parse element, somehow did not.")
},
Ok(Some((element, _))) => {
Some(element)
}
}
WebmElement::check_space(self.0).unwrap_or(None).and_then(|element_size| {
let (element_data, rest) = self.0.split_at(element_size);
self.0 = rest;
match WebmElement::decode_element(element_data) {
Err(_) => None,
Ok(None) => panic!("Buffer was supposed to have enough data to parse element, somehow did not."),
Ok(Some((element, _))) => Some(element)
}
}
})
}
}
@ -41,29 +26,19 @@ impl<'b> EbmlEventSource for EbmlSlice<'b> {
type Error = EbmlError;
fn poll_event<'a, T: FromEbml<'a>>(&'a mut self) -> Result<Async<Option<T>>, EbmlError> {
match T::check_space(self.0) {
Err(err) => {
Err(err)
},
Ok(None) => {
Ok(None)
},
Ok(Some(element_size)) => {
let (element_data, rest) = self.0.split_at(element_size);
self.0 = rest;
match T::decode_element(element_data) {
Err(err) => {
Err(err)
},
Ok(None) => {
// buffer should have enough data
panic!("Buffer was supposed to have enough data to parse element, somehow did not.")
},
Ok(Some((element, _))) => {
Ok(Some(element))
T::check_space(self.0).and_then(|size_option| {
match size_option {
None => Ok(None),
Some(element_size) => {
let (element_data, rest) = self.0.split_at(element_size);
self.0 = rest;
match T::decode_element(element_data) {
Err(err) => Err(err),
Ok(None) => panic!("Buffer was supposed to have enough data to parse element, somehow did not."),
Ok(Some((element, _))) => Ok(Some(element))
}
}
}
}.map(Async::Ready)
}).map(Async::Ready)
}
}