Package org.apache.tools.zip

# Interface ZipExtraField

All Known Subinterfaces:
  `CentralDirectoryParsingZipExtraField`

All Known Implementing Classes:
  `AbstractUnicodeExtraField`, `AsiExtraField`, `JarMarker`, `UnicodeCommentExtraField`, `UnicodePathExtraField`, `UnparseableExtraFieldData`, `UnrecognizedExtraField`, `Zip64ExtendedInformationExtraField`

public interface ZipExtraField
General format of extra field data.

Extra fields usually appear twice per file, once in the local file data and once in the central directory. Usually they are the same, but they don't have to be. `java.util.zip.ZipOutputStream` will only use the local file data in both places.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `byte[]`
  `getCentralDirectoryData()`
  The actual data to put into central directory - without Header-ID or length specifier.
  `ZipShort`
  `getCentralDirectoryLength()`
  Length of the extra field in the central directory - without Header-ID or length specifier.
  `ZipShort`
  `getHeaderId()`
  The Header-ID.
  `byte[]`
  `getLocalFileDataData()`
  The actual data to put into local file data - without Header-ID or length specifier.
  `ZipShort`
  `getLocalFileDataLength()`
  Length of the extra field in the local file data - without Header-ID or length specifier.
  `void`
  `parseFromLocalFileData(byte[] data, int offset, int length)`
  Populate data from this array as if it was in local file data.

- ## Method Details

  - ### getHeaderId

    ZipShort getHeaderId()
    The Header-ID.
    Returns:
      the header id
    Since:
      1.1

  - ### getLocalFileDataLength

    ZipShort getLocalFileDataLength()
    Length of the extra field in the local file data - without Header-ID or length specifier.
    Returns:
      the length of the field in the local file data
    Since:
      1.1

  - ### getCentralDirectoryLength

    ZipShort getCentralDirectoryLength()
    Length of the extra field in the central directory - without Header-ID or length specifier.
    Returns:
      the length of the field in the central directory
    Since:
      1.1

  - ### getLocalFileDataData

    byte[] getLocalFileDataData()
    The actual data to put into local file data - without Header-ID or length specifier.
    Returns:
      the data
    Since:
      1.1

  - ### getCentralDirectoryData

    byte[] getCentralDirectoryData()
    The actual data to put into central directory - without Header-ID or length specifier.
    Returns:
      the data
    Since:
      1.1

  - ### parseFromLocalFileData

    void parseFromLocalFileData(byte[] data, int offset, int length) throws ZipException
    Populate data from this array as if it was in local file data.
    Parameters:
      `data` - an array of bytes
      `offset` - the start offset
      `length` - the number of bytes in the array from offset
    Throws:
      `ZipException` - on error
    Since:
      1.1