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package packfile
import "fmt"
// ParseOfsDeltaDistance parses one ofs-delta backward distance.
func ParseOfsDeltaDistance(buf []byte) (uint64, int, error) {
if len(buf) == 0 {
return 0, 0, fmt.Errorf("packfile: malformed ofs-delta distance")
}
b := buf[0]
dist := uint64(b & 0x7f)
consumed := 1
for b&0x80 != 0 {
if consumed >= len(buf) {
return 0, 0, fmt.Errorf("packfile: malformed ofs-delta distance")
}
b = buf[consumed]
consumed++
dist = ((dist + 1) << 7) + uint64(b&0x7f)
}
return dist, consumed, nil
}
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