mirror of
https://github.com/yacy/yacy_search_server.git
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659178942f
queue and not from virtual documents generated by the parser. - The parser now generates nice description texts for NOLOAD entries which shall make it possible to find media content using the search index and not using the media prefetch algorithm during search (which was costly) - Removed the media-search prefetch process from image search
123 lines
4.8 KiB
Java
123 lines
4.8 KiB
Java
/**
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* tarParser
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* Copyright 2010 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
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* First released 29.6.2010 at http://yacy.net
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*
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* $LastChangedDate$
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* $LastChangedRevision$
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* $LastChangedBy$
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.document.parser;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.RandomAccessFile;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.zip.GZIPInputStream;
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import net.yacy.cora.document.MultiProtocolURI;
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import net.yacy.cora.document.UTF8;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.document.TextParser;
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import net.yacy.kelondro.util.FileUtils;
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import org.apache.tools.tar.TarEntry;
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import org.apache.tools.tar.TarInputStream;
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// this is a new implementation of this parser idiom using multiple documents as result set
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public class tarParser extends AbstractParser implements Parser {
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private final static String MAGIC = "ustar"; // A magic for a tar archive, may appear at #101h-#105
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public tarParser() {
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super("Tape Archive File Parser");
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this.SUPPORTED_EXTENSIONS.add("tar");
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this.SUPPORTED_MIME_TYPES.add("application/x-tar");
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this.SUPPORTED_MIME_TYPES.add("application/tar");
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this.SUPPORTED_MIME_TYPES.add("applicaton/x-gtar");
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this.SUPPORTED_MIME_TYPES.add("multipart/x-tar");
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}
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@Override
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public Document[] parse(final MultiProtocolURI url, final String mimeType, final String charset, InputStream source) throws Parser.Failure, InterruptedException {
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final List<Document> docacc = new ArrayList<Document>();
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Document[] subDocs = null;
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final String ext = url.getFileExtension().toLowerCase();
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if (ext.equals("gz") || ext.equals("tgz")) {
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try {
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source = new GZIPInputStream(source);
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} catch (final IOException e) {
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throw new Parser.Failure("tar parser: " + e.getMessage(), url);
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}
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}
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TarEntry entry;
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final TarInputStream tis = new TarInputStream(source);
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File tmp = null;
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// loop through the elements in the tar file and parse every single file inside
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while (true) {
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try {
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if (tis.available() <= 0) break;
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entry = tis.getNextEntry();
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if (entry == null) break;
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if (entry.isDirectory() || entry.getSize() <= 0) continue;
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final String name = entry.getName();
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final int idx = name.lastIndexOf('.');
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final String mime = TextParser.mimeOf((idx > -1) ? name.substring(idx+1) : "");
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try {
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tmp = FileUtils.createTempFile(this.getClass(), name);
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FileUtils.copy(tis, tmp, entry.getSize());
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subDocs = TextParser.parseSource(MultiProtocolURI.newURL(url,"#" + name), mime, null, tmp);
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if (subDocs == null) continue;
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for (final Document d: subDocs) docacc.add(d);
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} catch (final Parser.Failure e) {
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this.log.logWarning("tar parser entry " + name + ": " + e.getMessage());
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} finally {
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if (tmp != null) FileUtils.deletedelete(tmp);
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}
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} catch (final IOException e) {
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this.log.logWarning("tar parser:" + e.getMessage());
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break;
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}
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}
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return docacc.toArray(new Document[docacc.size()]);
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}
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public final static boolean isTar(File f) {
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if (!f.exists() || f.length() < 0x105) return false;
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try {
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RandomAccessFile raf = new RandomAccessFile(f, "r");
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raf.seek(0x101);
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byte[] b = new byte[5];
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raf.read(b);
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return MAGIC.equals(UTF8.String(b));
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} catch (FileNotFoundException e) {
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return false;
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} catch (IOException e) {
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return false;
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}
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}
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}
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