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package reading
import (
"bytes"
"fmt"
objectid "codeberg.org/lindenii/furgit/object/id"
)
// verifyMappedPackMatchesMappedIdx compares one mapped pack trailer hash with
// the pack hash recorded in one mapped idx trailer.
func verifyMappedPackMatchesMappedIdx(packData, idxData []byte, algo objectid.Algorithm) error {
hashSize := algo.Size()
if hashSize <= 0 {
return objectid.ErrInvalidAlgorithm
}
if len(packData) < hashSize {
return fmt.Errorf("objectstore/packed: pack too short for trailer hash")
}
if len(idxData) < hashSize*2 {
return fmt.Errorf("objectstore/packed: idx too short for trailer hashes")
}
packTrailerHash := packData[len(packData)-hashSize:]
idxPackHash := idxData[len(idxData)-hashSize*2 : len(idxData)-hashSize]
if !bytes.Equal(packTrailerHash, idxPackHash) {
return fmt.Errorf("objectstore/packed: pack hash does not match idx")
}
return nil
}
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