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use crate::{data, pack};
impl pack::Bundle {
/// Find an object with the given [`ObjectId`][git_hash::ObjectId] and place its data into `out`.
///
/// [`cache`][pack::cache::DecodeEntry] is used to accelerate the lookup.
///
/// **Note** that ref deltas are automatically resolved within this pack only, which makes this implementation unusable
/// for thin packs, which by now are expected to be resolved already.
pub fn find<'a>(
&self,
id: impl AsRef<git_hash::oid>,
out: &'a mut Vec<u8>,
cache: &mut impl pack::cache::DecodeEntry,
) -> Result<Option<data::Object<'a>>, pack::data::decode_entry::Error> {
let idx = match self.index.lookup(id) {
Some(idx) => idx,
None => return Ok(None),
};
self.internal_get_object_by_index(idx, out, cache).map(Some)
}
/// Internal-use function to look up an object index. Used to avoid double-lookups in
/// [compound::Db::find()][crate::compound::Db::find()]. (The polonius borrow-checker would support this via the 'find'
/// function, so this can be [simplified](https://github.com/Byron/gitoxide/blob/0c5f4043da4615820cb180804a81c2d4fe75fe5e/git-odb/src/compound/locate.rs#L47)
/// once polonius is stable.)
pub(crate) fn internal_find_pack_index(&self, id: &git_hash::oid) -> Option<u32> {
self.index.lookup(id)
}
/// Internal-use function to get an object given an index previously returned from
/// internal_find_pack_index.
pub(crate) fn internal_get_object_by_index<'a>(
&self,
idx: u32,
out: &'a mut Vec<u8>,
cache: &mut impl pack::cache::DecodeEntry,
) -> Result<data::Object<'a>, pack::data::decode_entry::Error> {
let ofs = self.index.pack_offset_at_index(idx);
let pack_entry = self.pack.entry(ofs);
let header_size = pack_entry.header_size();
self.pack
.decode_entry(
pack_entry,
out,
|id, _out| {
self.index.lookup(id).map(|idx| {
pack::data::ResolvedBase::InPack(self.pack.entry(self.index.pack_offset_at_index(idx)))
})
},
cache,
)
.map(move |r| crate::data::Object {
kind: r.kind,
data: out.as_slice(),
pack_location: Some(pack::bundle::Location {
pack_id: self.pack.id,
index_file_id: idx,
entry_size: r.compressed_size + header_size,
}),
})
}
}