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package arangodb
import (
"crypto/md5"
"encoding/binary"
"encoding/hex"
"io"
)
//convert a string into arango-key safe hex bytes hash
func hashString(dir string) string {
h := md5.New()
io.WriteString(h, dir)
b := h.Sum(nil)
return hex.EncodeToString(b)
}
// convert slice of bytes into slice of uint64
// the first uint64 indicates the length in bytes
func bytesToArray(bs []byte) []uint64 {
out := make([]uint64, 0, 2+len(bs)/8)
out = append(out, uint64(len(bs)))
for len(bs)%8 != 0 {
bs = append(bs, 0)
}
for i := 0; i < len(bs); i = i + 8 {
out = append(out, binary.BigEndian.Uint64(bs[i:]))
}
return out
}
// convert from slice of uint64 back to bytes
// if input length is 0 or 1, will return nil
func arrayToBytes(xs []uint64) []byte {
if len(xs) < 2 {
return nil
}
first := xs[0]
out := make([]byte, len(xs)*8) // i think this can actually be len(xs)*8-8, but i dont think an extra 8 bytes hurts...
for i := 1; i < len(xs); i = i + 1 {
binary.BigEndian.PutUint64(out[((i-1)*8):], xs[i])
}
return out[:first]
}
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