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|
package packed
import (
"fmt"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
// resolveHeaderAt resolves one object's canonical type and declared content size.
func (store *Store) resolveHeaderAt(start location) (objecttype.Type, int64, error) {
visited := make(map[location]struct{})
current := start
declaredSize := int64(-1)
for {
if _, ok := visited[current]; ok {
return objecttype.TypeInvalid, 0, fmt.Errorf("objectstore/packed: delta cycle while resolving object header")
}
visited[current] = struct{}{}
pack, meta, err := store.entryMetaAt(current)
if err != nil {
return objecttype.TypeInvalid, 0, err
}
if declaredSize < 0 {
if meta.ty.IsBaseObject() {
declaredSize = meta.size
} else {
size, err := deltaDeclaredSizeAt(pack, meta.dataOffset)
if err != nil {
return objecttype.TypeInvalid, 0, err
}
declaredSize = size
}
}
if meta.ty.IsBaseObject() {
return meta.ty, declaredSize, nil
}
switch meta.ty {
case objecttype.TypeRefDelta:
next, err := store.lookup(meta.baseRefID)
if err != nil {
return objecttype.TypeInvalid, 0, err
}
current = next
case objecttype.TypeOfsDelta:
current = location{
packName: current.packName,
offset: meta.baseOfs,
}
case objecttype.TypeCommit, objecttype.TypeTree, objecttype.TypeBlob, objecttype.TypeTag:
return objecttype.TypeInvalid, 0, fmt.Errorf("objectstore/packed: internal invariant violation for base type %d", meta.ty)
case objecttype.TypeInvalid, objecttype.TypeFuture:
return objecttype.TypeInvalid, 0, fmt.Errorf("objectstore/packed: unsupported pack type %d", meta.ty)
default:
return objecttype.TypeInvalid, 0, fmt.Errorf("objectstore/packed: unsupported pack type %d", meta.ty)
}
}
}
|
