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Tidy ssz decoding code

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Paul Hauner 2019-05-11 22:52:24 +10:00
parent fc2a406edf
commit 02afc6ef24
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1 changed files with 16 additions and 20 deletions
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36
eth2/utils/ssz/src/decode.rs
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@ -102,31 +102,27 @@ impl<'a> SszDecoderBuilder<'a> {
}
fn apply_offsets(&mut self) -> Result<(), DecodeError> {
dbg!(&self.offsets);
dbg!(&self.items);
if !self.offsets.is_empty() {
let mut running_offset = self.offsets[0].offset;
if running_offset != self.items_index {
return Err(DecodeError::OutOfBoundsByte { i: running_offset })
// Check to ensure the first offset points to the byte immediately following the
// fixed-length bytes.
if self.offsets[0].offset != self.items_index {
return Err(DecodeError::OutOfBoundsByte {
i: self.offsets[0].offset,
});
}
for i in 1..=self.offsets.len() {
let slice_option = if i == self.offsets.len() {
self.bytes.get(running_offset..)
} else {
let offset = self.offsets[i];
let start = running_offset;
running_offset = offset.offset;
// Iterate through each pair of offsets, grabbing the slice between each of the offsets.
for pair in self.offsets.windows(2) {
let a = pair[0];
let b = pair[1];
self.bytes.get(start..running_offset)
};
self.items[a.position] = &self.bytes[a.offset..b.offset];
}
let slice = slice_option
.ok_or_else(|| DecodeError::OutOfBoundsByte { i: running_offset })?;
self.items[self.offsets[i - 1].position] = slice;
// Handle the last offset, pushing a slice from it's start through to the end of
// `self.bytes`.
if let Some(last) = self.offsets.last() {
self.items[last.position] = &self.bytes[last.offset..]
}
}