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Remove repeated code in `decode_element`

This commit is contained in:
Tangent 128 2019-10-20 00:25:35 -04:00
parent d894a139f2
commit a9b66b6297
1 changed files with 5 additions and 20 deletions
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25
src/ebml.rs
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@ -249,26 +249,11 @@ pub trait FromEbml<'a>: Sized {
/// Attempt to construct an instance of this type from the given byte slice
fn decode_element(bytes: &'a[u8]) -> Result<Option<(Self, usize)>, EbmlError> {
match decode_tag(bytes) {
Ok(None) => Ok(None),
Err(err) => Err(err),
Ok(Some((element_id, payload_size_tag, tag_size))) => {
let should_unwrap = Self::should_unwrap(element_id);
let payload_size = match (should_unwrap, payload_size_tag) {
(true, _) => 0,
(false, Varint::Unknown) => return Err(EbmlError::UnknownElementLength),
(false, Varint::Value(size)) => size as usize
};
let element_size = tag_size + payload_size;
if element_size > bytes.len() {
// need to read more still
return Ok(None);
}
match Self::decode(element_id, &bytes[tag_size..element_size]) {
Ok(element) => Ok(Some((element, element_size))),
match Self::check_space(bytes)? {
None => Ok(None),
Some(info) => {
match Self::decode(info.element_id, &bytes[info.body_offset..info.element_len]) {
Ok(element) => Ok(Some((element, info.element_len))),
Err(error) => Err(error)
}
}