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+/* FileURLConnection.java -- URLConnection class for "file" protocol
+ Copyright (C) 1998, 1999, 2003 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.net.protocol.file;
+
+import gnu.classpath.SystemProperties;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.FilePermission;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
+import java.net.ProtocolException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.security.Permission;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+import java.net.MalformedURLException;
+
+/**
+ * This subclass of java.net.URLConnection models a URLConnection via
+ * the "file" protocol.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @author Nic Ferrier (nferrier@tapsellferrier.co.uk)
+ * @author Warren Levy (warrenl@cygnus.com)
+ */
+public class Connection extends URLConnection
+{
+ /**
+ * Default permission for a file
+ */
+ private static final String DEFAULT_PERMISSION = "read";
+
+ private static class StaticData
+ {
+ /**
+ * HTTP-style DateFormat, used to format the last-modified header.
+ */
+ static SimpleDateFormat dateFormat
+ = new SimpleDateFormat("EEE, dd MMM yyyy hh:mm:ss 'GMT'",
+ new Locale ("En", "Us", "Unix"));
+
+ static String lineSeparator =
+ SystemProperties.getProperty("line.separator");
+ }
+
+
+ /**
+ * This is a File object for this connection
+ */
+ private File file;
+
+ /**
+ * If a directory, contains a list of files in the directory.
+ */
+ private byte[] directoryListing;
+
+ /**
+ * InputStream if we are reading from the file
+ */
+ private InputStream inputStream;
+
+ /**
+ * OutputStream if we are writing to the file
+ */
+ private OutputStream outputStream;
+
+ /**
+ * FilePermission to read the file
+ */
+ private FilePermission permission;
+
+ /**
+ * Calls superclass constructor to initialize.
+ */
+ public Connection(URL url)
+ {
+ super (url);
+
+ permission = new FilePermission(getURL().getFile(), DEFAULT_PERMISSION);
+ }
+
+ /**
+ * Unquote "%" + hex quotes characters
+ *
+ * @param str The string to unquote or null.
+ *
+ * @return The unquoted string or null if str was null.
+ *
+ * @exception MalformedURLException If the given string contains invalid
+ * escape sequences.
+ *
+ */
+ public static String unquote(String str) throws MalformedURLException
+ {
+ if (str == null)
+ return null;
+
+ final int MAX_BYTES_PER_UTF_8_CHAR = 3;
+ byte[] buf = new byte[str.length()*MAX_BYTES_PER_UTF_8_CHAR];
+ int pos = 0;
+ for (int i = 0; i < str.length(); i++)
+ {
+ char c = str.charAt(i);
+ if (c == '%')
+ {
+ if (i + 2 >= str.length())
+ throw new MalformedURLException(str + " : Invalid quoted character");
+ int hi = Character.digit(str.charAt(++i), 16);
+ int lo = Character.digit(str.charAt(++i), 16);
+ if (lo < 0 || hi < 0)
+ throw new MalformedURLException(str + " : Invalid quoted character");
+ buf[pos++] = (byte) (hi * 16 + lo);
+ }
+ else if (c > 127) {
+ try {
+ byte [] c_as_bytes = Character.toString(c).getBytes("utf-8");
+ final int c_length = c_as_bytes.length;
+ System.arraycopy(c_as_bytes, 0, buf, pos, c_length);
+ pos += c_length;
+ }
+ catch (java.io.UnsupportedEncodingException x2) {
+ throw (Error) new InternalError().initCause(x2);
+ }
+ }
+ else
+ buf[pos++] = (byte) c;
+ }
+ try
+ {
+ return new String(buf, 0, pos, "utf-8");
+ }
+ catch (java.io.UnsupportedEncodingException x2)
+ {
+ throw (Error) new InternalError().initCause(x2);
+ }
+ }
+
+ /**
+ * "Connects" to the file by opening it.
+ */
+ public void connect() throws IOException
+ {
+ // Call is ignored if already connected.
+ if (connected)
+ return;
+
+ // If not connected, then file needs to be openned.
+ file = new File (unquote(getURL().getFile()));
+
+ if (! file.isDirectory())
+ {
+ if (doInput)
+ inputStream = new BufferedInputStream(new FileInputStream(file));
+
+ if (doOutput)
+ outputStream = new BufferedOutputStream(new FileOutputStream(file));
+ }
+ else
+ {
+ if (doInput)
+ {
+ inputStream = new ByteArrayInputStream(getDirectoryListing());
+ }
+
+ if (doOutput)
+ throw new ProtocolException
+ ("file: protocol does not support output on directories");
+ }
+
+ connected = true;
+ }
+
+ /**
+ * Populates the <code>directoryListing</code> field with a byte array
+ * containing a representation of the directory listing.
+ */
+ byte[] getDirectoryListing()
+ throws IOException
+ {
+ if (directoryListing == null)
+ {
+ ByteArrayOutputStream sink = new ByteArrayOutputStream();
+ // NB uses default character encoding for this system
+ Writer writer = new OutputStreamWriter(sink);
+
+ String[] files = file.list();
+
+ for (int i = 0; i < files.length; i++)
+ {
+ writer.write(files[i]);
+ writer.write(StaticData.lineSeparator);
+ }
+
+ directoryListing = sink.toByteArray();
+ }
+ return directoryListing;
+ }
+
+ /**
+ * Opens the file for reading and returns a stream for it.
+ *
+ * @return An InputStream for this connection.
+ *
+ * @exception IOException If an error occurs
+ */
+ public InputStream getInputStream()
+ throws IOException
+ {
+ if (!doInput)
+ throw new ProtocolException("Can't open InputStream if doInput is false");
+
+ if (!connected)
+ connect();
+
+ return inputStream;
+ }
+
+ /**
+ * Opens the file for writing and returns a stream for it.
+ *
+ * @return An OutputStream for this connection.
+ *
+ * @exception IOException If an error occurs.
+ */
+ public OutputStream getOutputStream()
+ throws IOException
+ {
+ if (!doOutput)
+ throw new
+ ProtocolException("Can't open OutputStream if doOutput is false");
+
+ if (!connected)
+ connect();
+
+ return outputStream;
+ }
+
+ /**
+ * Get the last modified time of the resource.
+ *
+ * @return the time since epoch that the resource was modified.
+ */
+ public long getLastModified()
+ {
+ try
+ {
+ if (!connected)
+ connect();
+
+ return file.lastModified();
+ }
+ catch (IOException e)
+ {
+ return -1;
+ }
+ }
+
+ /**
+ * Get an http-style header field. Just handle a few common ones.
+ */
+ public String getHeaderField(String field)
+ {
+ try
+ {
+ if (!connected)
+ connect();
+
+ if (field.equals("content-type"))
+ return guessContentTypeFromName(file.getName());
+ else if (field.equals("content-length"))
+ {
+ if (file.isDirectory())
+ {
+ return Integer.toString(getContentLength());
+ }
+ return Long.toString(file.length());
+ }
+ else if (field.equals("last-modified"))
+ {
+ synchronized (StaticData.dateFormat)
+ {
+ return StaticData.dateFormat.format(
+ new Date(file.lastModified()));
+ }
+ }
+ }
+ catch (IOException e)
+ {
+ // Fall through.
+ }
+ return null;
+ }
+
+ /**
+ * Get the length of content.
+ *
+ * @return the length of the content.
+ */
+ public int getContentLength()
+ {
+ try
+ {
+ if (!connected)
+ connect();
+
+ if (file.isDirectory())
+ {
+ return getDirectoryListing().length;
+ }
+ return (int) file.length();
+ }
+ catch (IOException e)
+ {
+ return -1;
+ }
+ }
+
+ /**
+ * This method returns a <code>Permission</code> object representing the
+ * permissions required to access this URL. This method returns a
+ * <code>java.io.FilePermission</code> for the file's path with a read
+ * permission.
+ *
+ * @return A Permission object
+ */
+ public Permission getPermission() throws IOException
+ {
+ return permission;
+ }
+}