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package packed
import (
"fmt"
objecttype "codeberg.org/lindenii/furgit/object/type"
deltaapply "codeberg.org/lindenii/furgit/format/packfile/delta/apply"
)
// deltaResolveChain resolves one object chain into content bytes.
func (store *Store) deltaResolveChain(chain deltaChain, declaredSize int64) (objecttype.Type, []byte, error) {
ty, out, nextDelta, err := store.deltaResolveChainStart(chain)
if err != nil {
return objecttype.TypeInvalid, nil, err
}
for i := nextDelta; i >= 0; i-- {
node := chain.deltas[i]
pack, err := store.openPack(node.loc.packName)
if err != nil {
return objecttype.TypeInvalid, nil, err
}
delta, err := inflateAt(pack, node.dataOffset, -1)
if err != nil {
return objecttype.TypeInvalid, nil, err
}
out, err = deltaapply.Apply(out, delta)
if err != nil {
return objecttype.TypeInvalid, nil, err
}
store.cacheMu.Lock()
store.deltaCache.add(
deltaBaseKey{packName: node.loc.packName, offset: node.loc.offset},
ty,
out,
)
store.cacheMu.Unlock()
}
if int64(len(out)) != declaredSize {
return objecttype.TypeInvalid, nil, fmt.Errorf(
"objectstorer/packed: resolved content size mismatch: got %d want %d",
len(out),
declaredSize,
)
}
if ty != chain.baseType {
return objecttype.TypeInvalid, nil, fmt.Errorf(
"objectstorer/packed: resolved content type mismatch: got %d want %d",
ty,
chain.baseType,
)
}
return ty, out, nil
}
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