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package ingest
import (
"fmt"
deltaapply "codeberg.org/lindenii/furgit/format/packfile/delta/apply"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
// applyDeltaRecord applies one delta record onto base content.
func applyDeltaRecord(state *ingestState, idx int, baseType objecttype.Type, baseContent []byte) (objecttype.Type, []byte, error) {
record := state.records[idx]
if record.packedType != objecttype.TypeOfsDelta && record.packedType != objecttype.TypeRefDelta {
return objecttype.TypeInvalid, nil, fmt.Errorf("packfile/ingest: record %d is not a delta record", idx)
}
deltaPayload, err := inflateRecordPayload(state, idx)
if err != nil {
return objecttype.TypeInvalid, nil, err
}
if int64(len(deltaPayload)) != record.declaredSize {
return objecttype.TypeInvalid, nil, &MalformedPackEntryError{
Offset: record.offset,
Reason: fmt.Sprintf("delta payload size mismatch got %d want %d", len(deltaPayload), record.declaredSize),
}
}
srcSize, dstSize, err := readDeltaHeaderSizes(deltaPayload)
if err != nil {
return objecttype.TypeInvalid, nil, &MalformedPackEntryError{
Offset: record.offset,
Reason: fmt.Sprintf("read delta header: %v", err),
}
}
if srcSize != len(baseContent) {
return objecttype.TypeInvalid, nil, &MalformedPackEntryError{
Offset: record.offset,
Reason: fmt.Sprintf("delta source size mismatch got %d want %d", srcSize, len(baseContent)),
}
}
content, err := deltaapply.Apply(baseContent, deltaPayload)
if err != nil {
return objecttype.TypeInvalid, nil, &MalformedPackEntryError{
Offset: record.offset,
Reason: fmt.Sprintf("apply delta: %v", err),
}
}
if len(content) != dstSize {
return objecttype.TypeInvalid, nil, &MalformedPackEntryError{
Offset: record.offset,
Reason: fmt.Sprintf("delta result size mismatch got %d want %d", len(content), dstSize),
}
}
return baseType, content, nil
}
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