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