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27 lines
655 B
Go
27 lines
655 B
Go
package trie
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// CompressNibbles - supports only even number of nibbles
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// This method supports only arrays of even nibbles
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//
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// HI_NIBBLE(b) = (b >> 4) & 0x0F
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// LO_NIBBLE(b) = b & 0x0F
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func CompressNibbles(nibbles []byte, out *[]byte) {
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tmp := (*out)[:0]
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for i := 0; i < len(nibbles); i += 2 {
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tmp = append(tmp, nibbles[i]<<4|nibbles[i+1])
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}
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*out = tmp
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}
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// DecompressNibbles - supports only even number of nibbles
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//
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// HI_NIBBLE(b) = (b >> 4) & 0x0F
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// LO_NIBBLE(b) = b & 0x0F
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func DecompressNibbles(in []byte, out *[]byte) {
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tmp := (*out)[:0]
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for i := 0; i < len(in); i++ {
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tmp = append(tmp, (in[i]>>4)&0x0F, in[i]&0x0F)
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}
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*out = tmp
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}
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