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compression.go
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compression.go
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// Licensed to NASA JPL under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. NASA JPL licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package output
func rLEncode(data []int) []int {
var encoded []int
count := 0
last := data[0]
for _, val := range data {
if last == val {
count = count + 1
} else {
encoded = append(encoded, last)
encoded = append(encoded, count)
last = val
count = 1
}
}
encoded = append(encoded, last)
encoded = append(encoded, count)
return encoded
}
func zeroRunEncode(data []int64) []int32 {
var encoded []int32
count := 0
init := false
for _, val := range data {
if val != 0 {
if init {
encoded = append(encoded, int32(0))
encoded = append(encoded, int32(count))
init = false
}
encoded = append(encoded, int32(val))
} else {
if !init {
count = 0
init = true
}
count = count + 1
}
}
if init {
encoded = append(encoded, 0)
encoded = append(encoded, int32(count))
}
return encoded
}