ZipInputStream

public class ZipInputStream
extends InflaterInputStream

java.lang.Object
   ↳ java.io.InputStream
     ↳ java.io.FilterInputStream
       ↳ java.util.zip.InflaterInputStream
         ↳ java.util.zip.ZipInputStream


This class implements an input stream filter for reading files in the ZIP file format. Includes support for both compressed and uncompressed entries.

Summary

Constants

int CENATT

Central directory (CEN) header internal file attributes field offset.

int CENATX

Central directory (CEN) header external file attributes field offset.

int CENCOM

Central directory (CEN) header comment length field offset.

int CENCRC

Central directory (CEN) header uncompressed file crc-32 value field offset.

int CENDSK

Central directory (CEN) header disk number start field offset.

int CENEXT

Central directory (CEN) header extra field length field offset.

int CENFLG

Central directory (CEN) header encrypt, decrypt flags field offset.

int CENHDR

Central directory (CEN) header size in bytes (including signature).

int CENHOW

Central directory (CEN) header compression method field offset.

int CENLEN

Central directory (CEN) header uncompressed size field offset.

int CENNAM

Central directory (CEN) header filename length field offset.

int CENOFF

Central directory (CEN) header LOC header offset field offset.

long CENSIG

Central directory (CEN) header signature.

int CENSIZ

Central directory (CEN) header compressed size field offset.

int CENTIM

Central directory (CEN) header modification time field offset.

int CENVEM

Central directory (CEN) header version made by field offset.

int CENVER

Central directory (CEN) header version needed to extract field offset.

int ENDCOM

End of central directory (END) header zip file comment length field offset.

int ENDHDR

End of central directory (END) header size in bytes (including signature).

int ENDOFF

End of central directory (END) header offset for the first CEN header field offset.

long ENDSIG

End of central directory (END) header signature.

int ENDSIZ

End of central directory (END) header central directory size in bytes field offset.

int ENDSUB

End of central directory (END) header number of entries on this disk field offset.

int ENDTOT

End of central directory (END) header total number of entries field offset.

int EXTCRC

Extra local (EXT) header uncompressed file crc-32 value field offset.

int EXTHDR

Extra local (EXT) header size in bytes (including signature).

int EXTLEN

Extra local (EXT) header uncompressed size field offset.

long EXTSIG

Extra local (EXT) header signature.

int EXTSIZ

Extra local (EXT) header compressed size field offset.

int LOCCRC

Local file (LOC) header uncompressed file crc-32 value field offset.

int LOCEXT

Local file (LOC) header extra field length field offset.

int LOCFLG

Local file (LOC) header general purpose bit flag field offset.

int LOCHDR

Local file (LOC) header size in bytes (including signature).

int LOCHOW

Local file (LOC) header compression method field offset.

int LOCLEN

Local file (LOC) header uncompressed size field offset.

int LOCNAM

Local file (LOC) header filename length field offset.

long LOCSIG

Local file (LOC) header signature.

int LOCSIZ

Local file (LOC) header compressed size field offset.

int LOCTIM

Local file (LOC) header modification time field offset.

int LOCVER

Local file (LOC) header version needed to extract field offset.

Inherited fields

Public constructors

ZipInputStream(InputStream in)

Creates a new ZIP input stream.

ZipInputStream(InputStream in, Charset charset)

Creates a new ZIP input stream.

Public methods

int available()

Returns 0 after EOF has reached for the current entry data, otherwise always return 1.

void close()

Closes this input stream and releases any system resources associated with the stream.

void closeEntry()

Closes the current ZIP entry and positions the stream for reading the next entry.

ZipEntry getNextEntry()

Reads the next ZIP file entry and positions the stream at the beginning of the entry data.

int read(byte[] b, int off, int len)

Reads from the current ZIP entry into an array of bytes.

long skip(long n)

Skips specified number of bytes in the current ZIP entry.

Protected methods

ZipEntry createZipEntry(String name)

Creates a new ZipEntry object for the specified entry name.

Inherited methods

Constants

CENATT

Added in API level 21
public static final int CENATT

Central directory (CEN) header internal file attributes field offset.

Constant Value: 36 (0x00000024)

CENATX

Added in API level 21
public static final int CENATX

Central directory (CEN) header external file attributes field offset.

Constant Value: 38 (0x00000026)

CENCOM

Added in API level 21
public static final int CENCOM

Central directory (CEN) header comment length field offset.

Constant Value: 32 (0x00000020)

CENCRC

Added in API level 21
public static final int CENCRC

Central directory (CEN) header uncompressed file crc-32 value field offset.

Constant Value: 16 (0x00000010)

CENDSK

Added in API level 21
public static final int CENDSK

Central directory (CEN) header disk number start field offset.

Constant Value: 34 (0x00000022)

CENEXT

Added in API level 21
public static final int CENEXT

Central directory (CEN) header extra field length field offset.

Constant Value: 30 (0x0000001e)

CENFLG

Added in API level 21
public static final int CENFLG

Central directory (CEN) header encrypt, decrypt flags field offset.

Constant Value: 8 (0x00000008)

CENHDR

Added in API level 21
public static final int CENHDR

Central directory (CEN) header size in bytes (including signature).

Constant Value: 46 (0x0000002e)

CENHOW

Added in API level 21
public static final int CENHOW

Central directory (CEN) header compression method field offset.

Constant Value: 10 (0x0000000a)

CENLEN

Added in API level 21
public static final int CENLEN

Central directory (CEN) header uncompressed size field offset.

Constant Value: 24 (0x00000018)

CENNAM

Added in API level 21
public static final int CENNAM

Central directory (CEN) header filename length field offset.

Constant Value: 28 (0x0000001c)

CENOFF

Added in API level 21
public static final int CENOFF

Central directory (CEN) header LOC header offset field offset.

Constant Value: 42 (0x0000002a)

CENSIG

Added in API level 21
public static final long CENSIG

Central directory (CEN) header signature.

Constant Value: 33639248 (0x0000000002014b50)

CENSIZ

Added in API level 21
public static final int CENSIZ

Central directory (CEN) header compressed size field offset.

Constant Value: 20 (0x00000014)

CENTIM

Added in API level 21
public static final int CENTIM

Central directory (CEN) header modification time field offset.

Constant Value: 12 (0x0000000c)

CENVEM

Added in API level 21
public static final int CENVEM

Central directory (CEN) header version made by field offset.

Constant Value: 4 (0x00000004)

CENVER

Added in API level 21
public static final int CENVER

Central directory (CEN) header version needed to extract field offset.

Constant Value: 6 (0x00000006)

ENDCOM

Added in API level 21
public static final int ENDCOM

End of central directory (END) header zip file comment length field offset.

Constant Value: 20 (0x00000014)

ENDHDR

Added in API level 21
public static final int ENDHDR

End of central directory (END) header size in bytes (including signature).

Constant Value: 22 (0x00000016)

ENDOFF

Added in API level 21
public static final int ENDOFF

End of central directory (END) header offset for the first CEN header field offset.

Constant Value: 16 (0x00000010)

ENDSIG

Added in API level 21
public static final long ENDSIG

End of central directory (END) header signature.

Constant Value: 101010256 (0x0000000006054b50)

ENDSIZ

Added in API level 21
public static final int ENDSIZ

End of central directory (END) header central directory size in bytes field offset.

Constant Value: 12 (0x0000000c)

ENDSUB

Added in API level 21
public static final int ENDSUB

End of central directory (END) header number of entries on this disk field offset.

Constant Value: 8 (0x00000008)

ENDTOT

Added in API level 21
public static final int ENDTOT

End of central directory (END) header total number of entries field offset.

Constant Value: 10 (0x0000000a)

EXTCRC

Added in API level 21
public static final int EXTCRC

Extra local (EXT) header uncompressed file crc-32 value field offset.

Constant Value: 4 (0x00000004)

EXTHDR

Added in API level 21
public static final int EXTHDR

Extra local (EXT) header size in bytes (including signature).

Constant Value: 16 (0x00000010)

EXTLEN

Added in API level 21
public static final int EXTLEN

Extra local (EXT) header uncompressed size field offset.

Constant Value: 12 (0x0000000c)

EXTSIG

Added in API level 21
public static final long EXTSIG

Extra local (EXT) header signature.

Constant Value: 134695760 (0x0000000008074b50)

EXTSIZ

Added in API level 21
public static final int EXTSIZ

Extra local (EXT) header compressed size field offset.

Constant Value: 8 (0x00000008)

LOCCRC

Added in API level 21
public static final int LOCCRC

Local file (LOC) header uncompressed file crc-32 value field offset.

Constant Value: 14 (0x0000000e)

LOCEXT

Added in API level 21
public static final int LOCEXT

Local file (LOC) header extra field length field offset.

Constant Value: 28 (0x0000001c)

LOCFLG

Added in API level 21
public static final int LOCFLG

Local file (LOC) header general purpose bit flag field offset.

Constant Value: 6 (0x00000006)

LOCHDR

Added in API level 21
public static final int LOCHDR

Local file (LOC) header size in bytes (including signature).

Constant Value: 30 (0x0000001e)

LOCHOW

Added in API level 21
public static final int LOCHOW

Local file (LOC) header compression method field offset.

Constant Value: 8 (0x00000008)

LOCLEN

Added in API level 21
public static final int LOCLEN

Local file (LOC) header uncompressed size field offset.

Constant Value: 22 (0x00000016)

LOCNAM

Added in API level 21
public static final int LOCNAM

Local file (LOC) header filename length field offset.

Constant Value: 26 (0x0000001a)

LOCSIG

Added in API level 21
public static final long LOCSIG

Local file (LOC) header signature.

Constant Value: 67324752 (0x0000000004034b50)

LOCSIZ

Added in API level 21
public static final int LOCSIZ

Local file (LOC) header compressed size field offset.

Constant Value: 18 (0x00000012)

LOCTIM

Added in API level 21
public static final int LOCTIM

Local file (LOC) header modification time field offset.

Constant Value: 10 (0x0000000a)

LOCVER

Added in API level 21
public static final int LOCVER

Local file (LOC) header version needed to extract field offset.

Constant Value: 4 (0x00000004)

Public constructors

ZipInputStream

Added in API level 1
public ZipInputStream (InputStream in)

Creates a new ZIP input stream.

The UTF-8 charset is used to decode the entry names.

Parameters
in InputStream: the actual input stream

ZipInputStream

Added in API level 1
public ZipInputStream (InputStream in, 
                Charset charset)

Creates a new ZIP input stream.

Parameters
in InputStream: the actual input stream

charset Charset: The charset to be used to decode the ZIP entry name (ignored if the language encoding bit of the ZIP entry's general purpose bit flag is set).

Public methods

available

Added in API level 1
public int available ()

Returns 0 after EOF has reached for the current entry data, otherwise always return 1.

Programs should not count on this method to return the actual number of bytes that could be read without blocking.

Returns
int 1 before EOF and 0 after EOF has reached for current entry.

Throws
IOException if an I/O error occurs.

close

Added in API level 1
public void close ()

Closes this input stream and releases any system resources associated with the stream.

Throws
IOException if an I/O error has occurred

closeEntry

Added in API level 1
public void closeEntry ()

Closes the current ZIP entry and positions the stream for reading the next entry.

Throws
ZipException if a ZIP file error has occurred
IOException if an I/O error has occurred

getNextEntry

Added in API level 1
public ZipEntry getNextEntry ()

Reads the next ZIP file entry and positions the stream at the beginning of the entry data.

If the app targets Android U or above, zip file entry names containing ".." or starting with "/" passed here will throw a ZipException. For more details, see ZipPathValidator.

Returns
ZipEntry the next ZIP file entry, or null if there are no more entries

Throws
ZipException if (1) a ZIP file error has occurred or (2) targetSdkVersion >= BUILD.VERSION_CODES.UPSIDE_DOWN_CAKE and (the name argument contains ".." or starts with "/").
IOException if an I/O error has occurred

read

Added in API level 1
public int read (byte[] b, 
                int off, 
                int len)

Reads from the current ZIP entry into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned.

Parameters
b byte: the buffer into which the data is read

off int: the start offset in the destination array b

len int: the maximum number of bytes read

Returns
int the actual number of bytes read, or -1 if the end of the entry is reached

Throws
NullPointerException if b is null.
IndexOutOfBoundsException if off is negative, len is negative, or len is greater than b.length - off
ZipException if a ZIP file error has occurred
IOException if an I/O error has occurred

skip

Added in API level 1
public long skip (long n)

Skips specified number of bytes in the current ZIP entry.

Parameters
n long: the number of bytes to skip

Returns
long the actual number of bytes skipped

Throws
ZipException if a ZIP file error has occurred
IOException if an I/O error has occurred
IllegalArgumentException if n < 0

Protected methods

createZipEntry

Added in API level 1
protected ZipEntry createZipEntry (String name)

Creates a new ZipEntry object for the specified entry name.

Parameters
name String: the ZIP file entry name

Returns
ZipEntry the ZipEntry just created