beyond-blockchain/bbclib-go

/*
Copyright (c) 2018 Zettant Inc.

Licensed 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 bbclib

import (
    "bytes"
    "compress/zlib"
    "io"
)

// ZlibCompress compresses the given data using zlib
func ZlibCompress(dat *[]byte) []byte {
    var dstbbuf bytes.Buffer
    zlibwriter := zlib.NewWriter(&dstbbuf)
    if _, err := zlibwriter.Write(*dat); err != nil {
        return nil
    }
    zlibwriter.Close()
    return dstbbuf.Bytes()
}

// ZlibDecompress decompresses the given data using zlib
func ZlibDecompress(dat []byte) ([]byte, error) {
    var srcbuf bytes.Buffer
    var dstbuf bytes.Buffer
    srcbuf.Write(dat)
    zlibreader, err := zlib.NewReader(&srcbuf)
    if err != nil {
        return nil, err
    }
    io.Copy(&dstbuf, zlibreader)
    zlibreader.Close()

    return dstbuf.Bytes(), nil
}