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author | obscuren <obscuren@obscura.com> | 2013-12-30 06:50:43 +0800 |
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committer | obscuren <obscuren@obscura.com> | 2013-12-30 06:50:43 +0800 |
commit | 74bc45116aa1c5d0e549f522dccefc58356c1410 (patch) | |
tree | b1a26b5b02170fad1146a610bcab4ee136def502 /encoding.go | |
parent | a1c5d5acac542ab877aeec7814338e7638d55dbf (diff) | |
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Encoding helpers with tests
Diffstat (limited to 'encoding.go')
-rw-r--r-- | encoding.go | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/encoding.go b/encoding.go new file mode 100644 index 000000000..ca30b47c9 --- /dev/null +++ b/encoding.go @@ -0,0 +1,46 @@ +package main + +import ( + "bytes" + "encoding/hex" + "strings" +) + +func CompactEncode(hexSlice []int) string { + terminator := 0 + if hexSlice[len(hexSlice)-1] == 16 { + terminator = 1 + } + + if terminator == 1 { + hexSlice = hexSlice[:len(hexSlice)-1] + } + + oddlen := len(hexSlice) % 2 + flags := 2 * terminator + oddlen + if oddlen != 0 { + hexSlice = append([]int{flags}, hexSlice...) + } else { + hexSlice = append([]int{flags, 0}, hexSlice...) + } + + var buff bytes.Buffer + for i := 0; i < len(hexSlice); i+=2 { + buff.WriteByte(byte(16 * hexSlice[i] + hexSlice[i+1])) + } + + return buff.String() +} + +func CompactHexDecode(str string) []int { + base := "0123456789abcdef" + hexSlice := make([]int, 0) + + enc := hex.EncodeToString([]byte(str)) + for _, v := range enc { + hexSlice = append(hexSlice, strings.IndexByte(base, byte(v))) + } + hexSlice = append(hexSlice, 16) + + return hexSlice +} |