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:
+ * 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
* ----- ---- -----------
* 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>
- *
+ * 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;
+ 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));
}
- /**
- * 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;
- }
+ 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);
- /**
- * File mode of this file.
- * @param mode the file mode
- * @since 1.1
- */
- public void setMode(int mode) {
- this.mode = getMode(mode);
+ if (linkArray.length == 0) {
+ link = "";
+ } else {
+ System.arraycopy(tmp, 10, linkArray, 0, linkArray.length);
+ link = new String(linkArray);
}
-
- /**
- * 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);
+ 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);
+ }
}
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