44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
use futures::Async;
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use ebml::EbmlError;
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use ebml::EbmlEventSource;
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use ebml::FromEbml;
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use webm::WebmElement;
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pub struct EbmlSlice<'a>(pub &'a [u8]);
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impl<'a> Iterator for EbmlSlice<'a> {
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type Item = WebmElement<'a>;
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fn next(&mut self) -> Option<WebmElement<'a>> {
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WebmElement::check_space(self.0).unwrap_or(None).and_then(|element_size| {
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let (element_data, rest) = self.0.split_at(element_size);
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self.0 = rest;
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match WebmElement::decode_element(element_data) {
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Err(_) => None,
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Ok(None) => panic!("Buffer was supposed to have enough data to parse element, somehow did not."),
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Ok(Some((element, _))) => Some(element)
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}
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})
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}
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}
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impl<'b> EbmlEventSource for EbmlSlice<'b> {
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type Error = EbmlError;
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fn poll_event<'a, T: FromEbml<'a>>(&'a mut self) -> Result<Async<Option<T>>, EbmlError> {
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T::check_space(self.0).and_then(|size_option| {
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match size_option {
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None => Ok(None),
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Some(element_size) => {
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let (element_data, rest) = self.0.split_at(element_size);
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self.0 = rest;
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match T::decode_element(element_data) {
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Err(err) => Err(err),
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Ok(None) => panic!("Buffer was supposed to have enough data to parse element, somehow did not."),
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Ok(Some((element, _))) => Ok(Some(element))
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}
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}
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}
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}).map(Async::Ready)
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}
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}
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