--- /dev/null
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.tools.zip;
+
+import java.util.zip.CRC32;
+import java.util.zip.ZipException;
+
+/**
+ * Adds Unix file permission and UID/GID fields as well as symbolic
+ * link handling.
+ *
+ * <p>This class uses the ASi extra field in the format:
+ * <pre>
+ * Value Size Description
+ * ----- ---- -----------
+ * (Unix3) 0x756e Short tag for this extra block type
+ * TSize Short total data size for this block
+ * CRC Long CRC-32 of the remaining data
+ * Mode Short file permissions
+ * SizDev Long symlink'd size OR major/minor dev num
+ * UID Short user ID
+ * GID Short group ID
+ * (var.) variable symbolic link filename
+ * </pre>
+ * taken from appnote.iz (Info-ZIP note, 981119) found at <a
+ * href="ftp://ftp.uu.net/pub/archiving/zip/doc/">ftp://ftp.uu.net/pub/archiving/zip/doc/</a></p>
+
+ *
+ * <p>Short is two bytes and Long is four bytes in big endian byte and
+ * word order, device numbers are currently not supported.</p>
+ *
+ */
+public class AsiExtraField implements ZipExtraField, UnixStat, Cloneable {
+
+ private static final ZipShort HEADER_ID = new ZipShort(0x756E);
+
+ /**
+ * Standard Unix stat(2) file mode.
+ *
+ * @since 1.1
+ */
+ private int mode = 0;
+ /**
+ * User ID.
+ *
+ * @since 1.1
+ */
+ private int uid = 0;
+ /**
+ * Group ID.
+ *
+ * @since 1.1
+ */
+ private int gid = 0;
+ /**
+ * File this entry points to, if it is a symbolic link.
+ *
+ * <p>empty string - if entry is not a symbolic link.</p>
+ *
+ * @since 1.1
+ */
+ private String link = "";
+ /**
+ * Is this an entry for a directory?
+ *
+ * @since 1.1
+ */
+ private boolean dirFlag = false;
+
+ /**
+ * Instance used to calculate checksums.
+ *
+ * @since 1.1
+ */
+ private CRC32 crc = new CRC32();
+
+ /** Constructor for AsiExtraField. */
+ public AsiExtraField() {
+ }
+
+ /**
+ * The Header-ID.
+ * @return the value for the header id for this extrafield
+ * @since 1.1
+ */
+ public ZipShort getHeaderId() {
+ return HEADER_ID;
+ }
+
+ /**
+ * Length of the extra field in the local file data - without
+ * Header-ID or length specifier.
+ * @return a <code>ZipShort</code> for the length of the data of this extra field
+ * @since 1.1
+ */
+ public ZipShort getLocalFileDataLength() {
+ return new ZipShort(4 // CRC
+ + 2 // Mode
+ + 4 // SizDev
+ + 2 // UID
+ + 2 // GID
+ + getLinkedFile().getBytes().length);
+ }
+
+ /**
+ * Delegate to local file data.
+ * @return the centralDirectory length
+ * @since 1.1
+ */
+ public ZipShort getCentralDirectoryLength() {
+ return getLocalFileDataLength();
+ }
+
+ /**
+ * The actual data to put into local file data - without Header-ID
+ * or length specifier.
+ * @return get the data
+ * @since 1.1
+ */
+ public byte[] getLocalFileDataData() {
+ // CRC will be added later
+ byte[] data = new byte[getLocalFileDataLength().getValue() - 4];
+ System.arraycopy(ZipShort.getBytes(getMode()), 0, data, 0, 2);
+
+ byte[] linkArray = getLinkedFile().getBytes();
+ System.arraycopy(ZipLong.getBytes(linkArray.length),
+ 0, data, 2, 4);
+
+ System.arraycopy(ZipShort.getBytes(getUserId()),
+ 0, data, 6, 2);
+ System.arraycopy(ZipShort.getBytes(getGroupId()),
+ 0, data, 8, 2);
+
+ System.arraycopy(linkArray, 0, data, 10, linkArray.length);
+
+ crc.reset();
+ crc.update(data);
+ long checksum = crc.getValue();
+
+ byte[] result = new byte[data.length + 4];
+ System.arraycopy(ZipLong.getBytes(checksum), 0, result, 0, 4);
+ System.arraycopy(data, 0, result, 4, data.length);
+ return result;
+ }
+
+ /**
+ * Delegate to local file data.
+ * @return the local file data
+ * @since 1.1
+ */
+ public byte[] getCentralDirectoryData() {
+ return getLocalFileDataData();
+ }
+
+ /**
+ * Set the user id.
+ * @param uid the user id
+ * @since 1.1
+ */
+ public void setUserId(int uid) {
+ this.uid = uid;
+ }
+
+ /**
+ * Get the user id.
+ * @return the user id
+ * @since 1.1
+ */
+ public int getUserId() {
+ return uid;
+ }
+
+ /**
+ * Set the group id.
+ * @param gid the group id
+ * @since 1.1
+ */
+ public void setGroupId(int gid) {
+ this.gid = gid;
+ }
+
+ /**
+ * Get the group id.
+ * @return the group id
+ * @since 1.1
+ */
+ public int getGroupId() {
+ return gid;
+ }
+
+ /**
+ * Indicate that this entry is a symbolic link to the given filename.
+ *
+ * @param name Name of the file this entry links to, empty String
+ * if it is not a symbolic link.
+ *
+ * @since 1.1
+ */
+ public void setLinkedFile(String name) {
+ link = name;
+ mode = getMode(mode);
+ }
+
+ /**
+ * Name of linked file
+ *
+ * @return name of the file this entry links to if it is a
+ * symbolic link, the empty string otherwise.
+ *
+ * @since 1.1
+ */
+ public String getLinkedFile() {
+ return link;
+ }
+
+ /**
+ * Is this entry a symbolic link?
+ * @return true if this is a symbolic link
+ * @since 1.1
+ */
+ public boolean isLink() {
+ return getLinkedFile().length() != 0;
+ }
+
+ /**
+ * File mode of this file.
+ * @param mode the file mode
+ * @since 1.1
+ */
+ public void setMode(int mode) {
+ this.mode = getMode(mode);
+ }
+
+ /**
+ * File mode of this file.
+ * @return the file mode
+ * @since 1.1
+ */
+ public int getMode() {
+ return mode;
+ }
+
+ /**
+ * Indicate whether this entry is a directory.
+ * @param dirFlag if true, this entry is a directory
+ * @since 1.1
+ */
+ public void setDirectory(boolean dirFlag) {
+ this.dirFlag = dirFlag;
+ mode = getMode(mode);
+ }
+
+ /**
+ * Is this entry a directory?
+ * @return true if this entry is a directory
+ * @since 1.1
+ */
+ public boolean isDirectory() {
+ return dirFlag && !isLink();
+ }
+
+ /**
+ * Populate data from this array as if it was in local file data.
+ * @param data an array of bytes
+ * @param offset the start offset
+ * @param length the number of bytes in the array from offset
+ * @since 1.1
+ * @throws ZipException on error
+ */
+ public void parseFromLocalFileData(byte[] data, int offset, int length)
+ throws ZipException {
+
+ long givenChecksum = ZipLong.getValue(data, offset);
+ byte[] tmp = new byte[length - 4];
+ System.arraycopy(data, offset + 4, tmp, 0, length - 4);
+ crc.reset();
+ crc.update(tmp);
+ long realChecksum = crc.getValue();
+ if (givenChecksum != realChecksum) {
+ throw new ZipException("bad CRC checksum "
+ + Long.toHexString(givenChecksum)
+ + " instead of "
+ + Long.toHexString(realChecksum));
+ }
+
+ int newMode = ZipShort.getValue(tmp, 0);
+ byte[] linkArray = new byte[(int) ZipLong.getValue(tmp, 2)];
+ uid = ZipShort.getValue(tmp, 6);
+ gid = ZipShort.getValue(tmp, 8);
+
+ if (linkArray.length == 0) {
+ link = "";
+ } else {
+ System.arraycopy(tmp, 10, linkArray, 0, linkArray.length);
+ link = new String(linkArray);
+ }
+ setDirectory((newMode & DIR_FLAG) != 0);
+ setMode(newMode);
+ }
+
+ /**
+ * Get the file mode for given permissions with the correct file type.
+ * @param mode the mode
+ * @return the type with the mode
+ * @since 1.1
+ */
+ protected int getMode(int mode) {
+ int type = FILE_FLAG;
+ if (isLink()) {
+ type = LINK_FLAG;
+ } else if (isDirectory()) {
+ type = DIR_FLAG;
+ }
+ return type | (mode & PERM_MASK);
+ }
+
+}
git://source.jalview.org / vamsas.git / blobdiff