Package org.apache.commons.compress.archivers.tar

# Class TarArchiveEntry

java.lang.Object
org.apache.commons.compress.archivers.tar.TarArchiveEntry

All Implemented Interfaces:
  `ArchiveEntry`, `EntryStreamOffsets`, `TarConstants`

public class TarArchiveEntry extends Object implements ArchiveEntry, TarConstants, EntryStreamOffsets
This class represents an entry in a Tar archive. It consists of the entry's header, as well as the entry's File. Entries can be instantiated in one of three ways, depending on how they are to be used.

TarEntries that are created from the header bytes read from an archive are instantiated with the `TarArchiveEntry(byte[])` constructor. These entries will be used when extracting from or listing the contents of an archive. These entries have their header filled in using the header bytes. They also set the File to null, since they reference an archive entry not a file.

TarEntries that are created from Files that are to be written into an archive are instantiated with the `TarArchiveEntry(File)` or `TarArchiveEntry(Path)` constructor. These entries have their header filled in using the File's information. They also keep a reference to the File for convenience when writing entries.

Finally, TarEntries can be constructed from nothing but a name. This allows the programmer to construct the entry by hand, for instance when only an InputStream is available for writing to the archive, and the header information is constructed from other information. In this case the header fields are set to defaults and the File is set to null.

The C structure for a Tar Entry's header is:

     struct header {
       char name[100];     // TarConstants.NAMELEN    - offset   0
       char mode[8];       // TarConstants.MODELEN    - offset 100
       char uid[8];        // TarConstants.UIDLEN     - offset 108
       char gid[8];        // TarConstants.GIDLEN     - offset 116
       char size[12];      // TarConstants.SIZELEN    - offset 124
       char mtime[12];     // TarConstants.MODTIMELEN - offset 136
       char chksum[8];     // TarConstants.CHKSUMLEN  - offset 148
       char linkflag[1];   //                         - offset 156
       char linkname[100]; // TarConstants.NAMELEN    - offset 157
       // The following fields are only present in new-style POSIX tar archives:
       char magic[6];      // TarConstants.MAGICLEN   - offset 257
       char version[2];    // TarConstants.VERSIONLEN - offset 263
       char uname[32];     // TarConstants.UNAMELEN   - offset 265
       char gname[32];     // TarConstants.GNAMELEN   - offset 297
       char devmajor[8];   // TarConstants.DEVLEN     - offset 329
       char devminor[8];   // TarConstants.DEVLEN     - offset 337
       char prefix[155];   // TarConstants.PREFIXLEN  - offset 345
       // Used if "name" field is not long enough to hold the path
       char pad[12];       // NULs                    - offset 500
     } header;

All unused bytes are set to null. New-style GNU tar files are slightly different from the above. For values of size larger than 077777777777L (11 7s) or uid and gid larger than 07777777L (7 7s) the sign bit of the first byte is set, and the rest of the field is the binary representation of the number. See `TarUtils.parseOctalOrBinary(byte[], int, int)`.

The C structure for a old GNU Tar Entry's header is:

     struct oldgnu_header {
       char unused_pad1[345]; // TarConstants.PAD1LEN_GNU       - offset 0
       char atime[12];        // TarConstants.ATIMELEN_GNU      - offset 345
       char ctime[12];        // TarConstants.CTIMELEN_GNU      - offset 357
       char offset[12];       // TarConstants.OFFSETLEN_GNU     - offset 369
       char longnames[4];     // TarConstants.LONGNAMESLEN_GNU  - offset 381
       char unused_pad2;      // TarConstants.PAD2LEN_GNU       - offset 385
       struct sparse sp[4];   // TarConstants.SPARSELEN_GNU     - offset 386
       char isextended;       // TarConstants.ISEXTENDEDLEN_GNU - offset 482
       char realsize[12];     // TarConstants.REALSIZELEN_GNU   - offset 483
       char unused_pad[17];   // TarConstants.PAD3LEN_GNU       - offset 495
     };

Whereas, "struct sparse" is:

     struct sparse {
       char offset[12];   // offset 0
       char numbytes[12]; // offset 12
     };

The C structure for a xstar (Jörg Schilling star) Tar Entry's header is:

     struct star_header {
       char name[100];     // offset   0
       char mode[8];       // offset 100
       char uid[8];        // offset 108
       char gid[8];        // offset 116
       char size[12];      // offset 124
       char mtime[12];     // offset 136
       char chksum[8];     // offset 148
       char typeflag;      // offset 156
       char linkname[100]; // offset 157
       char magic[6];      // offset 257
       char version[2];    // offset 263
       char uname[32];     // offset 265
       char gname[32];     // offset 297
       char devmajor[8];   // offset 329
       char devminor[8];   // offset 337
       char prefix[131];   // offset 345
       char atime[12];     // offset 476
       char ctime[12];     // offset 488
       char mfill[8];      // offset 500
       char xmagic[4];     // offset 508  "tar\0"
     };

which is identical to new-style POSIX up to the first 130 bytes of the prefix.

The C structure for the xstar-specific parts of a xstar Tar Entry's header is:

     struct xstar_in_header {
       char fill[345];         // offset 0     Everything before t_prefix
       char prefix[1];         // offset 345   Prefix for t_name
       char fill2;             // offset 346
       char fill3[8];          // offset 347
       char isextended;        // offset 355
       struct sparse sp[SIH];  // offset 356   8 x 12
       char realsize[12];      // offset 452   Real size for sparse data
       char offset[12];        // offset 464   Offset for multivolume data
       char atime[12];         // offset 476
       char ctime[12];         // offset 488
       char mfill[8];          // offset 500
       char xmagic[4];         // offset 508   "tar\0"
     };

This class is not thread-safe

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final int`
  `DEFAULT_DIR_MODE`
  Default permissions bits for directories
  `static final int`
  `DEFAULT_FILE_MODE`
  Default permissions bits for files
  `static final int`
  `MAX_NAMELEN`
  Maximum length of a user's name in the tar file
  `static final int`
  `MILLIS_PER_SECOND`
  Deprecated.
  Unused.
  `static final long`
  `UNKNOWN`
  Value used to indicate unknown mode, user/groupids, device numbers and modTime when parsing a file in lenient mode and the archive contains illegal fields.

  ### Fields inherited from interface org.apache.commons.compress.archivers.ArchiveEntry

  `SIZE_UNKNOWN`

  ### Fields inherited from interface org.apache.commons.compress.archivers.EntryStreamOffsets

  `OFFSET_UNKNOWN`

  ### Fields inherited from interface org.apache.commons.compress.archivers.tar.TarConstants

  `ATIMELEN_GNU, ATIMELEN_XSTAR, CHKSUM_OFFSET, CHKSUMLEN, CTIMELEN_GNU, CTIMELEN_XSTAR, DEFAULT_BLKSIZE, DEFAULT_RCDSIZE, DEVLEN, FORMAT_OLDGNU, FORMAT_POSIX, FORMAT_XSTAR, GIDLEN, GNAMELEN, GNU_LONGLINK, ISEXTENDEDLEN_GNU, ISEXTENDEDLEN_GNU_SPARSE, LF_BLK, LF_CHR, LF_CONTIG, LF_DIR, LF_FIFO, LF_GNUTYPE_LONGLINK, LF_GNUTYPE_LONGNAME, LF_GNUTYPE_SPARSE, LF_LINK, LF_MULTIVOLUME, LF_NORMAL, LF_OFFSET, LF_OLDNORM, LF_PAX_EXTENDED_HEADER_LC, LF_PAX_EXTENDED_HEADER_UC, LF_PAX_GLOBAL_EXTENDED_HEADER, LF_SYMLINK, LONGNAMESLEN_GNU, MAGIC_ANT, MAGIC_GNU, MAGIC_OFFSET, MAGIC_POSIX, MAGIC_XSTAR, MAGICLEN, MAXID, MAXSIZE, MODELEN, MODTIMELEN, NAMELEN, OFFSETLEN_GNU, PAD2LEN_GNU, PREFIXLEN, PREFIXLEN_XSTAR, REALSIZELEN_GNU, SIZELEN, SPARSE_HEADERS_IN_EXTENSION_HEADER, SPARSE_HEADERS_IN_OLDGNU_HEADER, SPARSE_NUMBYTES_LEN, SPARSE_OFFSET_LEN, SPARSELEN_GNU, SPARSELEN_GNU_SPARSE, UIDLEN, UNAMELEN, VERSION_ANT, VERSION_GNU_SPACE, VERSION_GNU_ZERO, VERSION_OFFSET, VERSION_POSIX, VERSIONLEN, XSTAR_ATIME_OFFSET, XSTAR_CTIME_OFFSET, XSTAR_MAGIC_LEN, XSTAR_MAGIC_OFFSET, XSTAR_MULTIVOLUME_OFFSET, XSTAR_PREFIX_OFFSET`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `TarArchiveEntry(byte[] headerBuf)`
  Constructs an entry from an archive's header bytes.
  `TarArchiveEntry(byte[] headerBuf, ZipEncoding encoding)`
  Constructs an entry from an archive's header bytes.
  `TarArchiveEntry(byte[] headerBuf, ZipEncoding encoding, boolean lenient)`
  Constructs an entry from an archive's header bytes.
  `TarArchiveEntry(byte[] headerBuf, ZipEncoding encoding, boolean lenient, long dataOffset)`
  Constructs an entry from an archive's header bytes for random access tar.
  `TarArchiveEntry(File file)`
  Constructs an entry for a file.
  `TarArchiveEntry(File file, String fileName)`
  Constructs an entry for a file.
  `TarArchiveEntry(String name)`
  Constructs an entry with only a name.
  `TarArchiveEntry(String name, boolean preserveAbsolutePath)`
  Constructs an entry with only a name.
  `TarArchiveEntry(String name, byte linkFlag)`
  Constructs an entry with a name and a link flag.
  `TarArchiveEntry(String name, byte linkFlag, boolean preserveAbsolutePath)`
  Constructs an entry with a name and a link flag.
  `TarArchiveEntry(Path file)`
  Constructs an entry for a file.
  `TarArchiveEntry(Path file, String fileName, LinkOption... linkOptions)`
  Constructs an entry for a file.
  `TarArchiveEntry(Map<String,String> globalPaxHeaders, byte[] headerBuf, ZipEncoding encoding, boolean lenient)`
  Constructs an entry from an archive's header bytes.
  `TarArchiveEntry(Map<String,String> globalPaxHeaders, byte[] headerBuf, ZipEncoding encoding, boolean lenient, long dataOffset)`
  Constructs an entry from an archive's header bytes for random access tar.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addPaxHeader(String name, String value)`
  add a PAX header to this entry.
  `void`
  `clearExtraPaxHeaders()`
  clear all extra PAX headers.
  `boolean`
  `equals(Object it)`
  Determine if the two entries are equal.
  `boolean`
  `equals(TarArchiveEntry it)`
  Determine if the two entries are equal.
  `FileTime`
  `getCreationTime()`
  Gets this entry's creation time.
  `long`
  `getDataOffset()`
  Gets the offset of data stream within the archive file,
  `int`
  `getDevMajor()`
  Gets this entry's major device number.
  `int`
  `getDevMinor()`
  Gets this entry's minor device number.
  `TarArchiveEntry[]`
  `getDirectoryEntries()`
  If this entry represents a file, and the file is a directory, return an array of TarEntries for this entry's children.
  `String`
  `getExtraPaxHeader(String name)`
  get named extra PAX header
  `Map<String,String>`
  `getExtraPaxHeaders()`
  get extra PAX Headers
  `File`
  `getFile()`
  Gets this entry's file.
  `int`
  `getGroupId()`
  Deprecated.
  use #getLongGroupId instead as group ids can be bigger than `Integer.MAX_VALUE`
  `String`
  `getGroupName()`
  Gets this entry's group name.
  `FileTime`
  `getLastAccessTime()`
  Gets this entry's last access time.
  `Date`
  `getLastModifiedDate()`
  Gets this entry's modification time.
  `FileTime`
  `getLastModifiedTime()`
  Gets this entry's modification time.
  `byte`
  `getLinkFlag()`
  Gets this entry's link flag.
  `String`
  `getLinkName()`
  Gets this entry's link name.
  `long`
  `getLongGroupId()`
  Gets this entry's group id.
  `long`
  `getLongUserId()`
  Gets this entry's user id.
  `int`
  `getMode()`
  Gets this entry's mode.
  `Date`
  `getModTime()`
  Gets this entry's modification time.
  `String`
  `getName()`
  Gets this entry's name.
  `List<TarArchiveStructSparse>`
  `getOrderedSparseHeaders()`
  Gets this entry's sparse headers ordered by offset with all empty sparse sections at the start filtered out.
  `Path`
  `getPath()`
  Gets this entry's file.
  `long`
  `getRealSize()`
  Gets this entry's real file size in case of a sparse file.
  `long`
  `getSize()`
  Gets this entry's file size.
  `List<TarArchiveStructSparse>`
  `getSparseHeaders()`
  Gets this entry's sparse headers
  `FileTime`
  `getStatusChangeTime()`
  Gets this entry's status change time.
  `int`
  `getUserId()`
  Deprecated.
  use #getLongUserId instead as user ids can be bigger than `Integer.MAX_VALUE`
  `String`
  `getUserName()`
  Gets this entry's user name.
  `int`
  `hashCode()`
  Hashcodes are based on entry names.
  `boolean`
  `isBlockDevice()`
  Check if this is a block device entry.
  `boolean`
  `isCharacterDevice()`
  Check if this is a character device entry.
  `boolean`
  `isCheckSumOK()`
  Gets this entry's checksum status.
  `boolean`
  `isDescendent(TarArchiveEntry desc)`
  Determine if the given entry is a descendant of this entry.
  `boolean`
  `isDirectory()`
  Return whether or not this entry represents a directory.
  `boolean`
  `isExtended()`
  Indicates in case of an oldgnu sparse file if an extension sparse header follows.
  `boolean`
  `isFIFO()`
  Check if this is a FIFO (pipe) entry.
  `boolean`
  `isFile()`
  Check if this is a "normal file"
  `boolean`
  `isGlobalPaxHeader()`
  Check if this is a Pax header.
  `boolean`
  `isGNULongLinkEntry()`
  Indicate if this entry is a GNU long linkname block
  `boolean`
  `isGNULongNameEntry()`
  Indicate if this entry is a GNU long name block
  `boolean`
  `isGNUSparse()`
  Indicate if this entry is a GNU sparse block.
  `boolean`
  `isLink()`
  Check if this is a link entry.
  `boolean`
  `isOldGNUSparse()`
  Indicate if this entry is a GNU or star sparse block using the oldgnu format.
  `boolean`
  `isPaxGNU1XSparse()`
  Gets if this entry is a sparse file with 1.X PAX Format or not
  `boolean`
  `isPaxGNUSparse()`
  Indicate if this entry is a GNU sparse block using one of the PAX formats.
  `boolean`
  `isPaxHeader()`
  Check if this is a Pax header.
  `boolean`
  `isSparse()`
  Check whether this is a sparse entry.
  `boolean`
  `isStarSparse()`
  Indicate if this entry is a star sparse block using PAX headers.
  `boolean`
  `isStreamContiguous()`
  Indicates whether the stream is contiguous, i.e.
  `boolean`
  `isSymbolicLink()`
  Check if this is a symbolic link entry.
  `void`
  `parseTarHeader(byte[] header)`
  Parse an entry's header information from a header buffer.
  `void`
  `parseTarHeader(byte[] header, ZipEncoding encoding)`
  Parse an entry's header information from a header buffer.
  `void`
  `setCreationTime(FileTime time)`
  Sets this entry's creation time.
  `void`
  `setDataOffset(long dataOffset)`
  Sets the offset of the data for the tar entry.
  `void`
  `setDevMajor(int devNo)`
  Sets this entry's major device number.
  `void`
  `setDevMinor(int devNo)`
  Sets this entry's minor device number.
  `void`
  `setGroupId(int groupId)`
  Sets this entry's group id.
  `void`
  `setGroupId(long groupId)`
  Sets this entry's group id.
  `void`
  `setGroupName(String groupName)`
  Sets this entry's group name.
  `void`
  `setIds(int userId, int groupId)`
  Convenience method to set this entry's group and user ids.
  `void`
  `setLastAccessTime(FileTime time)`
  Sets this entry's last access time.
  `void`
  `setLastModifiedTime(FileTime time)`
  Sets this entry's modification time.
  `void`
  `setLinkName(String link)`
  Sets this entry's link name.
  `void`
  `setMode(int mode)`
  Sets the mode for this entry
  `void`
  `setModTime(long time)`
  Sets this entry's modification time.
  `void`
  `setModTime(FileTime time)`
  Sets this entry's modification time.
  `void`
  `setModTime(Date time)`
  Sets this entry's modification time.
  `void`
  `setName(String name)`
  Sets this entry's name.
  `void`
  `setNames(String userName, String groupName)`
  Convenience method to set this entry's group and user names.
  `void`
  `setSize(long size)`
  Sets this entry's file size.
  `void`
  `setSparseHeaders(List<TarArchiveStructSparse> sparseHeaders)`
  Sets this entry's sparse headers
  `void`
  `setStatusChangeTime(FileTime time)`
  Sets this entry's status change time.
  `void`
  `setUserId(int userId)`
  Sets this entry's user id.
  `void`
  `setUserId(long userId)`
  Sets this entry's user id.
  `void`
  `setUserName(String userName)`
  Sets this entry's user name.
  `void`
  `writeEntryHeader(byte[] outbuf)`
  Write an entry's header information to a header buffer.
  `void`
  `writeEntryHeader(byte[] outbuf, ZipEncoding encoding, boolean starMode)`
  Write an entry's header information to a header buffer.

  ### Methods inherited from class java.lang.Object

  `clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### UNKNOWN

    public static final long UNKNOWN
    Value used to indicate unknown mode, user/groupids, device numbers and modTime when parsing a file in lenient mode and the archive contains illegal fields.
    Since:
      1.19
    See Also:
      - Constant Field Values

  - ### MAX_NAMELEN

    public static final int MAX_NAMELEN
    Maximum length of a user's name in the tar file
    See Also:
      - Constant Field Values

  - ### DEFAULT_DIR_MODE

    public static final int DEFAULT_DIR_MODE
    Default permissions bits for directories
    See Also:
      - Constant Field Values

  - ### DEFAULT_FILE_MODE

    public static final int DEFAULT_FILE_MODE
    Default permissions bits for files
    See Also:
      - Constant Field Values

  - ### MILLIS_PER_SECOND

    @Deprecated public static final int MILLIS_PER_SECOND
    Deprecated.
    Unused.
    Convert millis to seconds
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### TarArchiveEntry

    public TarArchiveEntry(byte[] headerBuf)
    Constructs an entry from an archive's header bytes. File is set to null.
    Parameters:
      `headerBuf` - The header bytes from a tar archive entry.
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format

  - ### TarArchiveEntry

    public TarArchiveEntry(byte[] headerBuf, ZipEncoding encoding) throws IOException
    Constructs an entry from an archive's header bytes. File is set to null.
    Parameters:
      `headerBuf` - The header bytes from a tar archive entry.
      `encoding` - encoding to use for file names
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format
      `IOException` - on error
    Since:
      1.4

  - ### TarArchiveEntry

    public TarArchiveEntry(byte[] headerBuf, ZipEncoding encoding, boolean lenient) throws IOException
    Constructs an entry from an archive's header bytes. File is set to null.
    Parameters:
      `headerBuf` - The header bytes from a tar archive entry.
      `encoding` - encoding to use for file names
      `lenient` - when set to true illegal values for group/userid, mode, device numbers and timestamp will be ignored and the fields set to `UNKNOWN`. When set to false such illegal fields cause an exception instead.
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format
      `IOException` - on error
    Since:
      1.19

  - ### TarArchiveEntry

    public TarArchiveEntry(byte[] headerBuf, ZipEncoding encoding, boolean lenient, long dataOffset) throws IOException
    Constructs an entry from an archive's header bytes for random access tar. File is set to null.
    Parameters:
      `headerBuf` - the header bytes from a tar archive entry.
      `encoding` - encoding to use for file names.
      `lenient` - when set to true illegal values for group/userid, mode, device numbers and timestamp will be ignored and the fields set to `UNKNOWN`. When set to false such illegal fields cause an exception instead.
      `dataOffset` - position of the entry data in the random access file.
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format.
      `IOException` - on error.
    Since:
      1.21

  - ### TarArchiveEntry

    public TarArchiveEntry(File file)
    Constructs an entry for a file. File is set to file, and the header is constructed from information from the file. The name is set from the normalized file path.

    The entry's name will be the value of the `file`'s path with all file separators replaced by forward slashes and leading slashes as well as Windows drive letters stripped. The name will end in a slash if the `file` represents a directory.

    Note: Since 1.21 this internally uses the same code as the TarArchiveEntry constructors with a `Path` as parameter. But all thrown exceptions are ignored. If handling those exceptions is needed consider switching to the path constructors.

    Parameters:
      `file` - The file that the entry represents.

  - ### TarArchiveEntry

    public TarArchiveEntry(File file, String fileName)
    Constructs an entry for a file. File is set to file, and the header is constructed from information from the file.

    The entry's name will be the value of the `fileName` argument with all file separators replaced by forward slashes and leading slashes as well as Windows drive letters stripped. The name will end in a slash if the `file` represents a directory.

    Note: Since 1.21 this internally uses the same code as the TarArchiveEntry constructors with a `Path` as parameter. But all thrown exceptions are ignored. If handling those exceptions is needed consider switching to the path constructors.

    Parameters:
      `file` - The file that the entry represents.
      `fileName` - the name to be used for the entry.

  - ### TarArchiveEntry

    public TarArchiveEntry(Map<String,String> globalPaxHeaders, byte[] headerBuf, ZipEncoding encoding, boolean lenient) throws IOException
    Constructs an entry from an archive's header bytes. File is set to null.
    Parameters:
      `globalPaxHeaders` - the parsed global PAX headers, or null if this is the first one.
      `headerBuf` - The header bytes from a tar archive entry.
      `encoding` - encoding to use for file names
      `lenient` - when set to true illegal values for group/userid, mode, device numbers and timestamp will be ignored and the fields set to `UNKNOWN`. When set to false such illegal fields cause an exception instead.
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format
      `IOException` - on error
    Since:
      1.22

  - ### TarArchiveEntry

    public TarArchiveEntry(Map<String,String> globalPaxHeaders, byte[] headerBuf, ZipEncoding encoding, boolean lenient, long dataOffset) throws IOException
    Constructs an entry from an archive's header bytes for random access tar. File is set to null.
    Parameters:
      `globalPaxHeaders` - the parsed global PAX headers, or null if this is the first one.
      `headerBuf` - the header bytes from a tar archive entry.
      `encoding` - encoding to use for file names.
      `lenient` - when set to true illegal values for group/userid, mode, device numbers and timestamp will be ignored and the fields set to `UNKNOWN`. When set to false such illegal fields cause an exception instead.
      `dataOffset` - position of the entry data in the random access file.
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format.
      `IOException` - on error.
    Since:
      1.22

  - ### TarArchiveEntry

    public TarArchiveEntry(Path file) throws IOException
    Constructs an entry for a file. File is set to file, and the header is constructed from information from the file. The name is set from the normalized file path.

    The entry's name will be the value of the `file`'s path with all file separators replaced by forward slashes and leading slashes as well as Windows drive letters stripped. The name will end in a slash if the `file` represents a directory.

    Parameters:
      `file` - The file that the entry represents.
    Throws:
      `IOException` - if an I/O error occurs
    Since:
      1.21

  - ### TarArchiveEntry

    public TarArchiveEntry(Path file, String fileName, LinkOption... linkOptions) throws IOException
    Constructs an entry for a file. File is set to file, and the header is constructed from information from the file.

    The entry's name will be the value of the `fileName` argument with all file separators replaced by forward slashes and leading slashes as well as Windows drive letters stripped. The name will end in a slash if the `file` represents a directory.

    Parameters:
      `file` - The file that the entry represents.
      `fileName` - the name to be used for the entry.
      `linkOptions` - options indicating how symbolic links are handled.
    Throws:
      `IOException` - if an I/O error occurs
    Since:
      1.21

  - ### TarArchiveEntry

    public TarArchiveEntry(String name)
    Constructs an entry with only a name. This allows the programmer to construct the entry's header "by hand". File is set to null.

    The entry's name will be the value of the `name` argument with all file separators replaced by forward slashes and leading slashes as well as Windows drive letters stripped.

    Parameters:
      `name` - the entry name

  - ### TarArchiveEntry

    public TarArchiveEntry(String name, boolean preserveAbsolutePath)
    Constructs an entry with only a name. This allows the programmer to construct the entry's header "by hand". File is set to null.

    The entry's name will be the value of the `name` argument with all file separators replaced by forward slashes. Leading slashes and Windows drive letters are stripped if `preserveAbsolutePath` is `false`.

    Parameters:
      `name` - the entry name
      `preserveAbsolutePath` - whether to allow leading slashes or drive letters in the name.
    Since:
      1.1

  - ### TarArchiveEntry

    public TarArchiveEntry(String name, byte linkFlag)
    Constructs an entry with a name and a link flag.

    The entry's name will be the value of the `name` argument with all file separators replaced by forward slashes and leading slashes as well as Windows drive letters stripped.

    Parameters:
      `name` - the entry name
      `linkFlag` - the entry link flag.

  - ### TarArchiveEntry

    public TarArchiveEntry(String name, byte linkFlag, boolean preserveAbsolutePath)
    Constructs an entry with a name and a link flag.

    The entry's name will be the value of the `name` argument with all file separators replaced by forward slashes. Leading slashes and Windows drive letters are stripped if `preserveAbsolutePath` is `false`.

    Parameters:
      `name` - the entry name
      `linkFlag` - the entry link flag.
      `preserveAbsolutePath` - whether to allow leading slashes or drive letters in the name.
    Since:
      1.5

- ## Method Details

  - ### addPaxHeader

    public void addPaxHeader(String name, String value)
    add a PAX header to this entry. If the header corresponds to an existing field in the entry, that field will be set; otherwise the header will be added to the extraPaxHeaders Map
    Parameters:
      `name` - The full name of the header to set.
      `value` - value of header.
    Since:
      1.15

  - ### clearExtraPaxHeaders

    public void clearExtraPaxHeaders()
    clear all extra PAX headers.
    Since:
      1.15

  - ### equals

    public boolean equals(Object it)
    Determine if the two entries are equal. Equality is determined by the header names being equal.
    Overrides:
      `equals` in class `Object`
    Parameters:
      `it` - Entry to be checked for equality.
    Returns:
      True if the entries are equal.

  - ### equals

    public boolean equals(TarArchiveEntry it)
    Determine if the two entries are equal. Equality is determined by the header names being equal.
    Parameters:
      `it` - Entry to be checked for equality.
    Returns:
      True if the entries are equal.

  - ### getCreationTime

    public FileTime getCreationTime()
    Gets this entry's creation time.
    Returns:
      This entry's computed creation time.
    Since:
      1.22

  - ### getDataOffset

    public long getDataOffset()
    Gets the offset of data stream within the archive file,
    Specified by:
      `getDataOffset` in interface `EntryStreamOffsets`
    Returns:
      the offset of entry data stream, `OFFSET_UNKNOWN` if not known.
    Since:
      1.21

  - ### getDevMajor

    public int getDevMajor()
    Gets this entry's major device number.
    Returns:
      This entry's major device number.
    Since:
      1.4

  - ### getDevMinor

    public int getDevMinor()
    Gets this entry's minor device number.
    Returns:
      This entry's minor device number.
    Since:
      1.4

  - ### getDirectoryEntries

    public TarArchiveEntry[] getDirectoryEntries()
    If this entry represents a file, and the file is a directory, return an array of TarEntries for this entry's children.

    This method is only useful for entries created from a `File` or `Path` but not for entries read from an archive.

    Returns:
      An array of TarEntry's for this entry's children.

  - ### getExtraPaxHeader

    public String getExtraPaxHeader(String name)
    get named extra PAX header
    Parameters:
      `name` - The full name of an extended PAX header to retrieve
    Returns:
      The value of the header, if any.
    Since:
      1.15

  - ### getExtraPaxHeaders

    public Map<String,String> getExtraPaxHeaders()
    get extra PAX Headers
    Returns:
      read-only map containing any extra PAX Headers
    Since:
      1.15

  - ### getFile

    public File getFile()
    Gets this entry's file.

    This method is only useful for entries created from a `File` or `Path` but not for entries read from an archive.

    Returns:
      this entry's file or null if the entry was not created from a file.

  - ### getGroupId

    @Deprecated public int getGroupId()
    Deprecated.
    use #getLongGroupId instead as group ids can be bigger than `Integer.MAX_VALUE`
    Gets this entry's group id.
    Returns:
      This entry's group id.

  - ### getGroupName

    public String getGroupName()
    Gets this entry's group name.
    Returns:
      This entry's group name.

  - ### getLastAccessTime

    public FileTime getLastAccessTime()
    Gets this entry's last access time.
    Returns:
      This entry's last access time.
    Since:
      1.22

  - ### getLastModifiedDate

    public Date getLastModifiedDate()
    Gets this entry's modification time. This is equivalent to `getLastModifiedTime()`, but precision is truncated to milliseconds.
    Specified by:
      `getLastModifiedDate` in interface `ArchiveEntry`
    Returns:
      This entry's modification time.
    See Also:
      - `getLastModifiedTime()`

  - ### getLastModifiedTime

    public FileTime getLastModifiedTime()
    Gets this entry's modification time.
    Returns:
      This entry's modification time.
    Since:
      1.22

  - ### getLinkFlag

    public byte getLinkFlag()
    Gets this entry's link flag.
    Returns:
      this entry's link flag.
    Since:
      1.23

  - ### getLinkName

    public String getLinkName()
    Gets this entry's link name.
    Returns:
      This entry's link name.

  - ### getLongGroupId

    public long getLongGroupId()
    Gets this entry's group id.
    Returns:
      This entry's group id.
    Since:
      1.10

  - ### getLongUserId

    public long getLongUserId()
    Gets this entry's user id.
    Returns:
      This entry's user id.
    Since:
      1.10

  - ### getMode

    public int getMode()
    Gets this entry's mode.
    Returns:
      This entry's mode.

  - ### getModTime

    public Date getModTime()
    Gets this entry's modification time. This is equivalent to `getLastModifiedTime()`, but precision is truncated to milliseconds.
    Returns:
      This entry's modification time.
    See Also:
      - `getLastModifiedTime()`

  - ### getName

    public String getName()
    Gets this entry's name.

    This method returns the raw name as it is stored inside of the archive.

    Specified by:
      `getName` in interface `ArchiveEntry`
    Returns:
      This entry's name.

  - ### getOrderedSparseHeaders

    public List<TarArchiveStructSparse> getOrderedSparseHeaders() throws IOException
    Gets this entry's sparse headers ordered by offset with all empty sparse sections at the start filtered out.
    Returns:
      immutable list of this entry's sparse headers, never null
    Throws:
      `IOException` - if the list of sparse headers contains blocks that overlap
    Since:
      1.21

  - ### getPath

    public Path getPath()
    Gets this entry's file.

    This method is only useful for entries created from a `File` or `Path` but not for entries read from an archive.

    Returns:
      this entry's file or null if the entry was not created from a file.
    Since:
      1.21

  - ### getRealSize

    public long getRealSize()
    Gets this entry's real file size in case of a sparse file.

    This is the size a file would take on disk if the entry was expanded.

    If the file is not a sparse file, return size instead of realSize.

    Returns:
      This entry's real file size, if the file is not a sparse file, return size instead of realSize.

  - ### getSize

    public long getSize()
    Gets this entry's file size.

    This is the size the entry's data uses inside the archive. Usually this is the same as `getRealSize()`, but it doesn't take the "holes" into account when the entry represents a sparse file.

    Specified by:
      `getSize` in interface `ArchiveEntry`
    Returns:
      This entry's file size.

  - ### getSparseHeaders

    public List<TarArchiveStructSparse> getSparseHeaders()
    Gets this entry's sparse headers
    Returns:
      This entry's sparse headers
    Since:
      1.20

  - ### getStatusChangeTime

    public FileTime getStatusChangeTime()
    Gets this entry's status change time.
    Returns:
      This entry's status change time.
    Since:
      1.22

  - ### getUserId

    @Deprecated public int getUserId()
    Deprecated.
    use #getLongUserId instead as user ids can be bigger than `Integer.MAX_VALUE`
    Gets this entry's user id.
    Returns:
      This entry's user id.

  - ### getUserName

    public String getUserName()
    Gets this entry's user name.
    Returns:
      This entry's user name.

  - ### hashCode

    public int hashCode()
    Hashcodes are based on entry names.
    Overrides:
      `hashCode` in class `Object`
    Returns:
      the entry hash code

  - ### isBlockDevice

    public boolean isBlockDevice()
    Check if this is a block device entry.
    Returns:
      whether this is a block device
    Since:
      1.2

  - ### isCharacterDevice

    public boolean isCharacterDevice()
    Check if this is a character device entry.
    Returns:
      whether this is a character device
    Since:
      1.2

  - ### isCheckSumOK

    public boolean isCheckSumOK()
    Gets this entry's checksum status.
    Returns:
      if the header checksum is reasonably correct
    Since:
      1.5
    See Also:
      - `TarUtils.verifyCheckSum(byte[])`

  - ### isDescendent

    public boolean isDescendent(TarArchiveEntry desc)
    Determine if the given entry is a descendant of this entry. Descendancy is determined by the name of the descendant starting with this entry's name.
    Parameters:
      `desc` - Entry to be checked as a descendent of this.
    Returns:
      True if entry is a descendant of this.

  - ### isDirectory

    public boolean isDirectory()
    Return whether or not this entry represents a directory.
    Specified by:
      `isDirectory` in interface `ArchiveEntry`
    Returns:
      True if this entry is a directory.

  - ### isExtended

    public boolean isExtended()
    Indicates in case of an oldgnu sparse file if an extension sparse header follows.
    Returns:
      true if an extension oldgnu sparse header follows.

  - ### isFIFO

    public boolean isFIFO()
    Check if this is a FIFO (pipe) entry.
    Returns:
      whether this is a FIFO entry
    Since:
      1.2

  - ### isFile

    public boolean isFile()
    Check if this is a "normal file"
    Returns:
      whether this is a "normal file"
    Since:
      1.2

  - ### isGlobalPaxHeader

    public boolean isGlobalPaxHeader()
    Check if this is a Pax header.
    Returns:
      `true` if this is a Pax header.
    Since:
      1.1

  - ### isGNULongLinkEntry

    public boolean isGNULongLinkEntry()
    Indicate if this entry is a GNU long linkname block
    Returns:
      true if this is a long name extension provided by GNU tar

  - ### isGNULongNameEntry

    public boolean isGNULongNameEntry()
    Indicate if this entry is a GNU long name block
    Returns:
      true if this is a long name extension provided by GNU tar

  - ### isGNUSparse

    public boolean isGNUSparse()
    Indicate if this entry is a GNU sparse block.
    Returns:
      true if this is a sparse extension provided by GNU tar

  - ### isLink

    public boolean isLink()
    Check if this is a link entry.
    Returns:
      whether this is a link entry
    Since:
      1.2

  - ### isOldGNUSparse

    public boolean isOldGNUSparse()
    Indicate if this entry is a GNU or star sparse block using the oldgnu format.
    Returns:
      true if this is a sparse extension provided by GNU tar or star
    Since:
      1.11

  - ### isPaxGNU1XSparse

    public boolean isPaxGNU1XSparse()
    Gets if this entry is a sparse file with 1.X PAX Format or not
    Returns:
      True if this entry is a sparse file with 1.X PAX Format
    Since:
      1.20

  - ### isPaxGNUSparse

    public boolean isPaxGNUSparse()
    Indicate if this entry is a GNU sparse block using one of the PAX formats.
    Returns:
      true if this is a sparse extension provided by GNU tar
    Since:
      1.11

  - ### isPaxHeader

    public boolean isPaxHeader()
    Check if this is a Pax header.
    Returns:
      `true` if this is a Pax header.
    Since:
      1.1

  - ### isSparse

    public boolean isSparse()
    Check whether this is a sparse entry.
    Returns:
      whether this is a sparse entry
    Since:
      1.11

  - ### isStarSparse

    public boolean isStarSparse()
    Indicate if this entry is a star sparse block using PAX headers.
    Returns:
      true if this is a sparse extension provided by star
    Since:
      1.11

  - ### isStreamContiguous

    public boolean isStreamContiguous()
    Indicates whether the stream is contiguous, i.e. not split among several archive parts, interspersed with control blocks, etc.
    Specified by:
      `isStreamContiguous` in interface `EntryStreamOffsets`
    Returns:
      true if stream is contiguous, false otherwise.
    Since:
      1.21

  - ### isSymbolicLink

    public boolean isSymbolicLink()
    Check if this is a symbolic link entry.
    Returns:
      whether this is a symbolic link
    Since:
      1.2

  - ### parseTarHeader

    public void parseTarHeader(byte[] header)
    Parse an entry's header information from a header buffer.
    Parameters:
      `header` - The tar entry header buffer to get information from.
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format

  - ### parseTarHeader

    public void parseTarHeader(byte[] header, ZipEncoding encoding) throws IOException
    Parse an entry's header information from a header buffer.
    Parameters:
      `header` - The tar entry header buffer to get information from.
      `encoding` - encoding to use for file names
    Throws:
      `IllegalArgumentException` - if any of the numeric fields have an invalid format
      `IOException` - on error
    Since:
      1.4

  - ### setCreationTime

    public void setCreationTime(FileTime time)
    Sets this entry's creation time.
    Parameters:
      `time` - This entry's new creation time.
    Since:
      1.22

  - ### setDataOffset

    public void setDataOffset(long dataOffset)
    Sets the offset of the data for the tar entry.
    Parameters:
      `dataOffset` - the position of the data in the tar.
    Since:
      1.21

  - ### setDevMajor

    public void setDevMajor(int devNo)
    Sets this entry's major device number.
    Parameters:
      `devNo` - This entry's major device number.
    Throws:
      `IllegalArgumentException` - if the devNo is < 0.
    Since:
      1.4

  - ### setDevMinor

    public void setDevMinor(int devNo)
    Sets this entry's minor device number.
    Parameters:
      `devNo` - This entry's minor device number.
    Throws:
      `IllegalArgumentException` - if the devNo is < 0.
    Since:
      1.4

  - ### setGroupId

    public void setGroupId(int groupId)
    Sets this entry's group id.
    Parameters:
      `groupId` - This entry's new group id.

  - ### setGroupId

    public void setGroupId(long groupId)
    Sets this entry's group id.
    Parameters:
      `groupId` - This entry's new group id.
    Since:
      1.10

  - ### setGroupName

    public void setGroupName(String groupName)
    Sets this entry's group name.
    Parameters:
      `groupName` - This entry's new group name.

  - ### setIds

    public void setIds(int userId, int groupId)
    Convenience method to set this entry's group and user ids.
    Parameters:
      `userId` - This entry's new user id.
      `groupId` - This entry's new group id.

  - ### setLastAccessTime

    public void setLastAccessTime(FileTime time)
    Sets this entry's last access time.
    Parameters:
      `time` - This entry's new last access time.
    Since:
      1.22

  - ### setLastModifiedTime

    public void setLastModifiedTime(FileTime time)
    Sets this entry's modification time.
    Parameters:
      `time` - This entry's new modification time.
    Since:
      1.22

  - ### setLinkName

    public void setLinkName(String link)
    Sets this entry's link name.
    Parameters:
      `link` - the link name to use.
    Since:
      1.1

  - ### setMode

    public void setMode(int mode)
    Sets the mode for this entry
    Parameters:
      `mode` - the mode for this entry

  - ### setModTime

    public void setModTime(Date time)
    Sets this entry's modification time.
    Parameters:
      `time` - This entry's new modification time.
    See Also:
      - `setLastModifiedTime(FileTime)`

  - ### setModTime

    public void setModTime(FileTime time)
    Sets this entry's modification time.
    Parameters:
      `time` - This entry's new modification time.
    Since:
      1.21
    See Also:
      - `setLastModifiedTime(FileTime)`

  - ### setModTime

    public void setModTime(long time)
    Sets this entry's modification time. The parameter passed to this method is in "Java time".
    Parameters:
      `time` - This entry's new modification time.
    See Also:
      - `setLastModifiedTime(FileTime)`

  - ### setName

    public void setName(String name)
    Sets this entry's name.
    Parameters:
      `name` - This entry's new name.

  - ### setNames

    public void setNames(String userName, String groupName)
    Convenience method to set this entry's group and user names.
    Parameters:
      `userName` - This entry's new user name.
      `groupName` - This entry's new group name.

  - ### setSize

    public void setSize(long size)
    Sets this entry's file size.
    Parameters:
      `size` - This entry's new file size.
    Throws:
      `IllegalArgumentException` - if the size is < 0.

  - ### setSparseHeaders

    public void setSparseHeaders(List<TarArchiveStructSparse> sparseHeaders)
    Sets this entry's sparse headers
    Parameters:
      `sparseHeaders` - The new sparse headers
    Since:
      1.20

  - ### setStatusChangeTime

    public void setStatusChangeTime(FileTime time)
    Sets this entry's status change time.
    Parameters:
      `time` - This entry's new status change time.
    Since:
      1.22

  - ### setUserId

    public void setUserId(int userId)
    Sets this entry's user id.
    Parameters:
      `userId` - This entry's new user id.

  - ### setUserId

    public void setUserId(long userId)
    Sets this entry's user id.
    Parameters:
      `userId` - This entry's new user id.
    Since:
      1.10

  - ### setUserName

    public void setUserName(String userName)
    Sets this entry's user name.
    Parameters:
      `userName` - This entry's new user name.

  - ### writeEntryHeader

    public void writeEntryHeader(byte[] outbuf)
    Write an entry's header information to a header buffer.

    This method does not use the star/GNU tar/BSD tar extensions.

    Parameters:
      `outbuf` - The tar entry header buffer to fill in.

  - ### writeEntryHeader

    public void writeEntryHeader(byte[] outbuf, ZipEncoding encoding, boolean starMode) throws IOException
    Write an entry's header information to a header buffer.
    Parameters:
      `outbuf` - The tar entry header buffer to fill in.
      `encoding` - encoding to use when writing the file name.
      `starMode` - whether to use the star/GNU tar/BSD tar extension for numeric fields if their value doesn't fit in the maximum size of standard tar archives
    Throws:
      `IOException` - on error
    Since:
      1.4