github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/core/location/gendb/loader.go (about)

     1  /*
     2   * Copyright (C) 2017 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package gendb
    19  
    20  import (
    21  	"compress/gzip"
    22  	"encoding/base64"
    23  	"io"
    24  	"strings"
    25  
    26  	"github.com/pkg/errors"
    27  )
    28  
    29  // EncodedDataLoader returns emmbeded database as byte array
    30  func EncodedDataLoader(data string, originalSize int, compressed bool) (decompressed []byte, err error) {
    31  	reader := base64.NewDecoder(base64.RawStdEncoding, strings.NewReader(data))
    32  
    33  	if compressed {
    34  		reader, err = gzip.NewReader(reader)
    35  		if err != nil {
    36  			return nil, err
    37  		}
    38  	}
    39  
    40  	decompressed, err = io.ReadAll(reader)
    41  	if err != nil {
    42  		return nil, err
    43  	}
    44  	if len(decompressed) != originalSize {
    45  		return nil, errors.New("original and decompressed data size mismatch")
    46  	}
    47  	return decompressed, nil
    48  }