Package org.apache.tools.zip

Class Zip64ExtendedInformationExtraField

java.lang.Object
org.apache.tools.zip.Zip64ExtendedInformationExtraField
All Implemented Interfaces:
CentralDirectoryParsingZipExtraField, ZipExtraField
public class Zip64ExtendedInformationExtraField extends Object implements CentralDirectoryParsingZipExtraField
Holds size and other extended information for entries that use Zip64 features.

See PKWARE's APPNOTE.TXT, section 4.5.3.

Currently Ant doesn't support encrypting the central directory so the note about masking doesn't apply.

The implementation relies on data being read from the local file header and assumes that both size values are always present.

Since:
Ant 1.9.0

  • Constructor Details

    • Zip64ExtendedInformationExtraField

      public Zip64ExtendedInformationExtraField()
      This constructor should only be used by the code that reads archives inside of Ant.

    • Zip64ExtendedInformationExtraField

      public Zip64ExtendedInformationExtraField(ZipEightByteInteger size, ZipEightByteInteger compressedSize)
      Creates an extra field based on the original and compressed size.
      Parameters:
      size - the entry's original size
      compressedSize - the entry's compressed size
      Throws:
      IllegalArgumentException - if size or compressedSize is null

    • Zip64ExtendedInformationExtraField

      public Zip64ExtendedInformationExtraField(ZipEightByteInteger size, ZipEightByteInteger compressedSize, ZipEightByteInteger relativeHeaderOffset, ZipLong diskStart)
      Creates an extra field based on all four possible values.
      Parameters:
      size - the entry's original size
      compressedSize - the entry's compressed size
      relativeHeaderOffset - ZipEightByteInteger
      diskStart - ZipLong
      Throws:
      IllegalArgumentException - if size or compressedSize is null

  • Method Details

    • getHeaderId

      public ZipShort getHeaderId()
      The Header-ID.
      Specified by:
      getHeaderId in interface ZipExtraField
      Returns:
      the header id

    • getLocalFileDataLength

      public ZipShort getLocalFileDataLength()
      Length of the extra field in the local file data - without Header-ID or length specifier.
      Specified by:
      getLocalFileDataLength in interface ZipExtraField
      Returns:
      the length of the field in the local file data

    • getCentralDirectoryLength

      public ZipShort getCentralDirectoryLength()
      Length of the extra field in the central directory - without Header-ID or length specifier.
      Specified by:
      getCentralDirectoryLength in interface ZipExtraField
      Returns:
      the length of the field in the central directory

    • getLocalFileDataData

      public byte[] getLocalFileDataData()
      The actual data to put into local file data - without Header-ID or length specifier.
      Specified by:
      getLocalFileDataData in interface ZipExtraField
      Returns:
      the data

    • getCentralDirectoryData

      public byte[] getCentralDirectoryData()
      The actual data to put into central directory - without Header-ID or length specifier.
      Specified by:
      getCentralDirectoryData in interface ZipExtraField
      Returns:
      the data

    • parseFromLocalFileData

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

    • parseFromCentralDirectoryData

      public void parseFromCentralDirectoryData(byte[] buffer, int offset, int length) throws ZipException
      Populate data from this array as if it was in central directory data.
      Specified by:
      parseFromCentralDirectoryData in interface CentralDirectoryParsingZipExtraField
      Parameters:
      buffer - an array of bytes
      offset - the start offset
      length - the number of bytes in the array from offset
      Throws:
      ZipException - on error

    • reparseCentralDirectoryData

      public void reparseCentralDirectoryData(boolean hasUncompressedSize, boolean hasCompressedSize, boolean hasRelativeHeaderOffset, boolean hasDiskStart) throws ZipException
      Parses the raw bytes read from the central directory extra field with knowledge which fields are expected to be there.

      All four fields inside the zip64 extended information extra field are optional and must only be present if their corresponding entry inside the central directory contains the correct magic value.

      Parameters:
      hasUncompressedSize - boolean
      hasCompressedSize - boolean
      hasRelativeHeaderOffset - boolean
      hasDiskStart - boolean
      Throws:
      ZipException - if expected length of central directory data is incorrect

    • getSize

      public ZipEightByteInteger getSize()
      The uncompressed size stored in this extra field.
      Returns:
      ZipEightByteInteger

    • setSize

      public void setSize(ZipEightByteInteger size)
      The uncompressed size stored in this extra field.
      Parameters:
      size - ZipEightByteInteger

    • getCompressedSize

      public ZipEightByteInteger getCompressedSize()
      The compressed size stored in this extra field.
      Returns:
      ZipEightByteInteger

    • setCompressedSize

      public void setCompressedSize(ZipEightByteInteger compressedSize)
      The uncompressed size stored in this extra field.
      Parameters:
      compressedSize - ZipEightByteInteger

    • getRelativeHeaderOffset

      public ZipEightByteInteger getRelativeHeaderOffset()
      The relative header offset stored in this extra field.
      Returns:
      ZipEightByteInteger

    • setRelativeHeaderOffset

      public void setRelativeHeaderOffset(ZipEightByteInteger rho)
      The relative header offset stored in this extra field.
      Parameters:
      rho - ZipEightByteInteger

    • getDiskStartNumber

      public ZipLong getDiskStartNumber()
      The disk start number stored in this extra field.
      Returns:
      ZipLong

    • setDiskStartNumber

      public void setDiskStartNumber(ZipLong ds)
      The disk start number stored in this extra field.
      Parameters:
      ds - ZipLong