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negentropy: slightly faster encodeVarInt()

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This commit is contained in:
fiatjaf
2024-09-18 15:50:50 -03:00
parent 6910f391fe
commit b1dd120ec7
1 changed files with 9 additions and 5 deletions
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14
nip77/negentropy/encoding.go
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@ -125,15 +125,19 @@ func encodeVarInt(n int) []byte {
return []byte{0} return []byte{0}
} }
var o []byte result := make([]byte, 8)
idx := 7
for n != 0 { for n != 0 {
o = append([]byte{byte(n & 0x7F)}, o...) result[idx] = byte(n & 0x7F)
n >>= 7 n >>= 7
idx--
} }
for i := 0; i < len(o)-1; i++ { result = result[idx+1:]
o[i] |= 0x80 for i := 0; i < len(result)-1; i++ {
result[i] |= 0x80
} }
return o return result
} }