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use std::convert::TryInto;
use crate::{extension, extension::Iter, util::from_be_u32};
impl<'a> Iter<'a> {
/// Create a new extension iterator at the entrypoint for extensions until the end of the extensions.
pub fn new(data_at_beginning_of_extensions_and_truncated: &'a [u8]) -> Self {
Iter {
data: data_at_beginning_of_extensions_and_truncated,
consumed: 0,
}
}
/// Create a new iterator at with a data block to the end of the file, and we automatically remove the trailing
/// hash of type `object_hash`.
pub fn new_without_checksum(
data_at_beginning_of_extensions: &'a [u8],
object_hash: gix_hash::Kind,
) -> Option<Self> {
let end = data_at_beginning_of_extensions
.len()
.checked_sub(object_hash.len_in_bytes())?;
Iter {
data: &data_at_beginning_of_extensions[..end],
consumed: 0,
}
.into()
}
}
impl<'a> Iterator for Iter<'a> {
type Item = (extension::Signature, &'a [u8]);
fn next(&mut self) -> Option<Self::Item> {
if self.data.len() < 4 + 4 {
return None;
}
let (signature, data) = self.data.split_at(4);
let (size, data) = data.split_at(4);
self.data = data;
self.consumed += 4 + 4;
let size = from_be_u32(size) as usize;
match data.get(..size) {
Some(ext_data) => {
self.data = &data[size..];
self.consumed += size;
Some((signature.try_into().unwrap(), ext_data))
}
None => {
self.data = &[];
None
}
}
}
}
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