64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
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// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public Licensee as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public Licensee for more details.
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//
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// You should have received a copy of the GNU Affero General Public Licensee
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package utils
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import (
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"archive/zip"
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"fmt"
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"io"
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"strconv"
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)
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// Change to deflate to gain better compression
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// see http://golang.org/pkg/archive/zip/#pkg-constants
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const CompressionUsed = zip.Deflate
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func WriteBytesToZip(filename string, data []byte, writer *zip.Writer) (err error) {
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header := &zip.FileHeader{
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Name: filename,
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Method: CompressionUsed,
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}
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w, err := writer.CreateHeader(header)
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if err != nil {
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return err
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}
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_, err = w.Write(data)
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return
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}
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// WriteFilesToZip writes a bunch of files from the db to a zip file. It exprects a map with the file id
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// as key and its content as io.ReadCloser.
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func WriteFilesToZip(files map[int64]io.ReadCloser, wr *zip.Writer) (err error) {
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for fid, file := range files {
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header := &zip.FileHeader{
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Name: "files/" + strconv.FormatInt(fid, 10),
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Method: CompressionUsed,
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}
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w, err := wr.CreateHeader(header)
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if err != nil {
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return err
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}
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_, err = io.Copy(w, file)
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if err != nil {
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return fmt.Errorf("error writing file %d: %s", fid, err)
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}
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_ = file.Close()
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}
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return nil
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}
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