117 lines
2.6 KiB
Go
117 lines
2.6 KiB
Go
/*
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* Copyright (c) 2013-2021 Utkan Güngördü <utkan@freeconsole.org>
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* Copyright (c) 2021-2024 Piotr Grabowski
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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 General Public License 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package archive
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import (
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"archive/zip"
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"errors"
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"path/filepath"
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"sort"
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"github.com/fauu/gomicsv/pixbuf"
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"github.com/gotk3/gotk3/gdk"
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)
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type Zip struct {
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files []*zip.File // File elements sorted by their Names
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reader *zip.ReadCloser
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name string // Name of the Zip file
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}
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type zipfile []*zip.File
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func (p zipfile) Len() int { return len(p) }
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func (p zipfile) Less(i, j int) bool { return strcmp(p[i].Name, p[j].Name, true) }
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func (p zipfile) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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// NewZip reads filenames from a given zip archive and sorts them
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func NewZip(name string) (*Zip, error) {
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var err error
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ar := new(Zip)
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ar.name = filepath.Base(name)
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ar.files = make([]*zip.File, 0, MaxArchiveEntries)
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ar.reader, err = zip.OpenReader(name)
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if err != nil {
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return nil, err
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}
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for _, f := range ar.reader.File {
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if !extensionMatches(f.Name, imageExtensions) {
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continue
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}
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ar.files = append(ar.files, f)
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}
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if len(ar.files) == 0 {
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return nil, errors.New(ar.name + ": no images in the zip file")
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}
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sort.Sort(zipfile(ar.files))
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return ar, nil
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}
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func (ar *Zip) checkbounds(i int) error {
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if i < 0 || i >= len(ar.files) {
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return ErrBounds
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}
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return nil
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}
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func (ar *Zip) Load(i int, autorotate bool, _nPreload int) (*gdk.Pixbuf, error) {
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if err := ar.checkbounds(i); err != nil {
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return nil, err
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}
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f, err := ar.files[i].Open()
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return pixbuf.Load(f, autorotate)
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}
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func (ar *Zip) Kind() Kind {
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return Packed
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}
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func (ar *Zip) ArchiveName() string {
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return ar.name
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}
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func (ar *Zip) Name(i int) (string, error) {
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if err := ar.checkbounds(i); err != nil {
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return "", err
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}
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return ar.files[i].Name, nil
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}
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func (ar *Zip) Len() *int {
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l := len(ar.files)
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return &l
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}
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func (ar *Zip) Close() error {
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return ar.reader.Close()
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}
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