Added in API level 1

JarInputStream

open class JarInputStream : ZipInputStream

kotlin.Any
↳	java.io.InputStream
	↳	java.io.FilterInputStream
		↳	java.util.zip.InflaterInputStream
			↳	java.util.zip.ZipInputStream
				↳	java.util.jar.JarInputStream

The JarInputStream class is used to read the contents of a JAR file from any input stream. It extends the class java.util.zip.ZipInputStream with support for reading an optional Manifest entry. The Manifest can be used to store meta-information about the JAR file and its entries.

Summary

Constants
static Int	`CENATT` Central directory (CEN) header internal file attributes field offset.
static Int	`CENATX` Central directory (CEN) header external file attributes field offset.
static Int	`CENCOM` Central directory (CEN) header comment length field offset.
static Int	`CENCRC` Central directory (CEN) header uncompressed file crc-32 value field offset.
static Int	`CENDSK` Central directory (CEN) header disk number start field offset.
static Int	`CENEXT` Central directory (CEN) header extra field length field offset.
static Int	`CENFLG` Central directory (CEN) header encrypt, decrypt flags field offset.
static Int	`CENHDR` Central directory (CEN) header size in bytes (including signature).
static Int	`CENHOW` Central directory (CEN) header compression method field offset.
static Int	`CENLEN` Central directory (CEN) header uncompressed size field offset.
static Int	`CENNAM` Central directory (CEN) header filename length field offset.
static Int	`CENOFF` Central directory (CEN) header LOC header offset field offset.
static Long	`CENSIG` Central directory (CEN) header signature.
static Int	`CENSIZ` Central directory (CEN) header compressed size field offset.
static Int	`CENTIM` Central directory (CEN) header modification time field offset.
static Int	`CENVEM` Central directory (CEN) header version made by field offset.
static Int	`CENVER` Central directory (CEN) header version needed to extract field offset.
static Int	`ENDCOM` End of central directory (END) header zip file comment length field offset.
static Int	`ENDHDR` End of central directory (END) header size in bytes (including signature).
static Int	`ENDOFF` End of central directory (END) header offset for the first CEN header field offset.
static Long	`ENDSIG` End of central directory (END) header signature.
static Int	`ENDSIZ` End of central directory (END) header central directory size in bytes field offset.
static Int	`ENDSUB` End of central directory (END) header number of entries on this disk field offset.
static Int	`ENDTOT` End of central directory (END) header total number of entries field offset.
static Int	`EXTCRC` Extra local (EXT) header uncompressed file crc-32 value field offset.
static Int	`EXTHDR` Extra local (EXT) header size in bytes (including signature).
static Int	`EXTLEN` Extra local (EXT) header uncompressed size field offset.
static Long	`EXTSIG` Extra local (EXT) header signature.
static Int	`EXTSIZ` Extra local (EXT) header compressed size field offset.
static Int	`LOCCRC` Local file (LOC) header uncompressed file crc-32 value field offset.
static Int	`LOCEXT` Local file (LOC) header extra field length field offset.
static Int	`LOCFLG` Local file (LOC) header general purpose bit flag field offset.
static Int	`LOCHDR` Local file (LOC) header size in bytes (including signature).
static Int	`LOCHOW` Local file (LOC) header compression method field offset.
static Int	`LOCLEN` Local file (LOC) header uncompressed size field offset.
static Int	`LOCNAM` Local file (LOC) header filename length field offset.
static Long	`LOCSIG` Local file (LOC) header signature.
static Int	`LOCSIZ` Local file (LOC) header compressed size field offset.
static Int	`LOCTIM` Local file (LOC) header modification time field offset.
static Int	`LOCVER` Local file (LOC) header version needed to extract field offset.

Public constructors
`JarInputStream(in: InputStream!)` Creates a new `JarInputStream` and reads the optional manifest.
`JarInputStream(in: InputStream!, verify: Boolean)` Creates a new `JarInputStream` and reads the optional manifest.

Public methods
open Manifest!	`getManifest()` Returns the `Manifest` for this JAR file, or `null` if none.
open ZipEntry!	`getNextEntry()` Reads the next ZIP file entry and positions the stream at the beginning of the entry data.
open JarEntry!	`getNextJarEntry()` Reads the next JAR file entry and positions the stream at the beginning of the entry data.
open Int	`read(b: ByteArray!, off: Int, len: Int)` Reads from the current JAR file entry into an array of bytes.

Protected methods
open ZipEntry!	`createZipEntry(name: String!)` Creates a new `JarEntry` (`ZipEntry`) for the specified JAR file entry name.

Inherited functions

From class ZipInputStream

`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.
`Unit`	`close()` Closes this input stream and releases any system resources associated with the stream.
`Unit`	`closeEntry()` Closes the current ZIP entry and positions the stream for reading the next entry.
`Long`	`skip(n: Long)` Skips specified number of bytes in the current ZIP entry.

From class InflaterInputStream

`Unit`	`fill()` Fills input buffer with more data to decompress.
`Unit`	`mark(readlimit: Int)` Marks the current position in this input stream. The `mark` method of `InflaterInputStream` does nothing.
`Boolean`	`markSupported()` Tests if this input stream supports the `mark` and `reset` methods. The `markSupported` method of `InflaterInputStream` returns `false`.
`Int`	`read()` Reads a byte of uncompressed data. This method will block until enough input is available for decompression.
`Unit`	`reset()` Repositions this stream to the position at the time the `mark` method was last called on this input stream. The method `reset` for class `InflaterInputStream` does nothing except throw an `IOException`.

From class InputStream

`InputStream!`	`nullInputStream()` Returns a new `InputStream` that reads no bytes. The returned stream is initially open. The stream is closed by calling the `close()` method. Subsequent calls to `close()` have no effect. While the stream is open, the `available()`, `read()`, `read(byte[])`, `read(byte[], int, int)`, `readAllBytes()`, `readNBytes(byte[], int, int)`, `readNBytes(int)`, `skip(long)`, `skipNBytes(long)`, and `transferTo()` methods all behave as if end of stream has been reached. After the stream has been closed, these methods all throw `IOException`. The `markSupported()` method returns `false`. The `mark()` method does nothing, and the `reset()` method throws `IOException`.
`ByteArray!`	`readAllBytes()` Reads all remaining bytes from the input stream. This method blocks until all remaining bytes have been read and end of stream is detected, or an exception is thrown. This method does not close the input stream. When this stream reaches end of stream, further invocations of this method will return an empty byte array. Note that this method is intended for simple cases where it is convenient to read all bytes into a byte array. It is not intended for reading input streams with large amounts of data. The behavior for the case where the input stream is asynchronously closed, or the thread interrupted during the read, is highly input stream specific, and therefore not specified. If an I/O error occurs reading from the input stream, then it may do so after some, but not all, bytes have been read. Consequently the input stream may not be at end of stream and may be in an inconsistent state. It is strongly recommended that the stream be promptly closed if an I/O error occurs.
`ByteArray!`	`readNBytes(len: Int)` Reads up to a specified number of bytes from the input stream. This method blocks until the requested number of bytes has been read, end of stream is detected, or an exception is thrown. This method does not close the input stream. The length of the returned array equals the number of bytes read from the stream. If `len` is zero, then no bytes are read and an empty byte array is returned. Otherwise, up to `len` bytes are read from the stream. Fewer than `len` bytes may be read if end of stream is encountered. When this stream reaches end of stream, further invocations of this method will return an empty byte array. Note that this method is intended for simple cases where it is convenient to read the specified number of bytes into a byte array. The total amount of memory allocated by this method is proportional to the number of bytes read from the stream which is bounded by `len`. Therefore, the method may be safely called with very large values of `len` provided sufficient memory is available. The behavior for the case where the input stream is asynchronously closed, or the thread interrupted during the read, is highly input stream specific, and therefore not specified. If an I/O error occurs reading from the input stream, then it may do so after some, but not all, bytes have been read. Consequently the input stream may not be at end of stream and may be in an inconsistent state. It is strongly recommended that the stream be promptly closed if an I/O error occurs.
`Int`	`readNBytes(b: ByteArray!, off: Int, len: Int)` Reads the requested number of bytes from the input stream into the given byte array. This method blocks until `len` bytes of input data have been read, end of stream is detected, or an exception is thrown. The number of bytes actually read, possibly zero, is returned. This method does not close the input stream. In the case where end of stream is reached before `len` bytes have been read, then the actual number of bytes read will be returned. When this stream reaches end of stream, further invocations of this method will return zero. If `len` is zero, then no bytes are read and `0` is returned; otherwise, there is an attempt to read up to `len` bytes. The first byte read is stored into element `b[off]`, the next one in to `b[off+1]`, and so on. The number of bytes read is, at most, equal to `len`. Let k be the number of bytes actually read; these bytes will be stored in elements `b[off]` through `b[off+`k`-1]`, leaving elements `b[off+`k `]` through `b[off+len-1]` unaffected. The behavior for the case where the input stream is asynchronously closed, or the thread interrupted during the read, is highly input stream specific, and therefore not specified. If an I/O error occurs reading from the input stream, then it may do so after some, but not all, bytes of `b` have been updated with data from the input stream. Consequently the input stream and `b` may be in an inconsistent state. It is strongly recommended that the stream be promptly closed if an I/O error occurs.
`Unit`	`skipNBytes(n: Long)` Skips over and discards exactly `n` bytes of data from this input stream. If `n` is zero, then no bytes are skipped. If `n` is negative, then no bytes are skipped. Subclasses may handle the negative value differently. This method blocks until the requested number of bytes has been skipped, end of file is reached, or an exception is thrown. If end of stream is reached before the stream is at the desired position, then an `EOFException` is thrown. If an I/O error occurs, then the input stream may be in an inconsistent state. It is strongly recommended that the stream be promptly closed if an I/O error occurs.
`Long`	`transferTo(out: OutputStream!)` Reads all bytes from this input stream and writes the bytes to the given output stream in the order that they are read. On return, this input stream will be at end of stream. This method does not close either stream. This method may block indefinitely reading from the input stream, or writing to the output stream. The behavior for the case where the input and/or output stream is asynchronously closed, or the thread interrupted during the transfer, is highly input and output stream specific, and therefore not specified. If an I/O error occurs reading from the input stream or writing to the output stream, then it may do so after some bytes have been read or written. Consequently the input stream may not be at end of stream and one, or both, streams may be in an inconsistent state. It is strongly recommended that both streams be promptly closed if an I/O error occurs.

From class FilterInputStream

Int

read(b: ByteArray!)

Reads up to b.length bytes of data from this input stream into an array of bytes. This method blocks until some input is available.

This method simply performs the call read(b, 0, b.length) and returns the result. It is important that it does not do in.read(b) instead; certain subclasses of FilterInputStream depend on the implementation strategy actually used.

Inherited properties

From class InflaterInputStream

`ByteArray!`	`buf` Input buffer for decompression.
`Boolean`	`closed` Indicates whether the #close() method has been called, internal use only.
`Inflater!`	`inf` Decompressor for this stream.
`Int`	`len` Length of input buffer.

From class FilterInputStream

InputStream!

in

The input stream to be filtered.

Constants

CENATT

Added in API level 21

static val CENATT: Int

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

Value: 36

CENATX

Added in API level 21

static val CENATX: Int

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

Value: 38

CENCOM

Added in API level 21

static val CENCOM: Int

Central directory (CEN) header comment length field offset.

Value: 32

CENCRC

Added in API level 21

static val CENCRC: Int

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

Value: 16

CENDSK

Added in API level 21

static val CENDSK: Int

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

Value: 34

CENEXT

Added in API level 21

static val CENEXT: Int

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

Value: 30

CENFLG

Added in API level 21

static val CENFLG: Int

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

Value: 8

CENHDR

Added in API level 21

static val CENHDR: Int

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

Value: 46

CENHOW

Added in API level 21

static val CENHOW: Int

Central directory (CEN) header compression method field offset.

Value: 10

CENLEN

Added in API level 21

static val CENLEN: Int

Central directory (CEN) header uncompressed size field offset.

Value: 24

CENNAM

Added in API level 21

static val CENNAM: Int

Central directory (CEN) header filename length field offset.

Value: 28

CENOFF

Added in API level 21

static val CENOFF: Int

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

Value: 42

CENSIG

Added in API level 21

static val CENSIG: Long

Central directory (CEN) header signature.

Value: 33639248L

CENSIZ

Added in API level 21

static val CENSIZ: Int

Central directory (CEN) header compressed size field offset.

Value: 20

CENTIM

Added in API level 21

static val CENTIM: Int

Central directory (CEN) header modification time field offset.

Value: 12

CENVEM

Added in API level 21

static val CENVEM: Int

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

Value: 4

CENVER

Added in API level 21

static val CENVER: Int

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

Value: 6

ENDCOM

Added in API level 21

static val ENDCOM: Int

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

Value: 20

ENDHDR

Added in API level 21

static val ENDHDR: Int

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

Value: 22

ENDOFF

Added in API level 21

static val ENDOFF: Int

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

Value: 16

ENDSIG

Added in API level 21

static val ENDSIG: Long

End of central directory (END) header signature.

Value: 101010256L

ENDSIZ

Added in API level 21

static val ENDSIZ: Int

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

Value: 12

ENDSUB

Added in API level 21

static val ENDSUB: Int

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

Value: 8

ENDTOT

Added in API level 21

static val ENDTOT: Int

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

Value: 10

EXTCRC

Added in API level 21

static val EXTCRC: Int

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

Value: 4

EXTHDR

Added in API level 21

static val EXTHDR: Int

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

Value: 16

EXTLEN

Added in API level 21

static val EXTLEN: Int

Extra local (EXT) header uncompressed size field offset.

Value: 12

EXTSIG

Added in API level 21

static val EXTSIG: Long

Extra local (EXT) header signature.

Value: 134695760L

EXTSIZ

Added in API level 21

static val EXTSIZ: Int

Extra local (EXT) header compressed size field offset.

Value: 8

LOCCRC

Added in API level 21

static val LOCCRC: Int

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

Value: 14

LOCEXT

Added in API level 21

static val LOCEXT: Int

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

Value: 28

LOCFLG

Added in API level 21

static val LOCFLG: Int

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

Value: 6

LOCHDR

Added in API level 21

static val LOCHDR: Int

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

Value: 30

LOCHOW

Added in API level 21

static val LOCHOW: Int

Local file (LOC) header compression method field offset.

Value: 8

LOCLEN

Added in API level 21

static val LOCLEN: Int

Local file (LOC) header uncompressed size field offset.

Value: 22

LOCNAM

Added in API level 21

static val LOCNAM: Int

Local file (LOC) header filename length field offset.

Value: 26

LOCSIG

Added in API level 21

static val LOCSIG: Long

Local file (LOC) header signature.

Value: 67324752L

LOCSIZ

Added in API level 21

static val LOCSIZ: Int

Local file (LOC) header compressed size field offset.

Value: 18

LOCTIM

Added in API level 21

static val LOCTIM: Int

Local file (LOC) header modification time field offset.

Value: 10

LOCVER

Added in API level 21

static val LOCVER: Int

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

Value: 4

Public constructors

JarInputStream

Added in API level 1

JarInputStream(in: InputStream!)

Creates a new JarInputStream and reads the optional manifest. If a manifest is present, also attempts to verify the signatures if the JarInputStream is signed.

Parameters
`in`	InputStream!: the actual input stream

Exceptions
`java.io.IOException`	if an I/O error has occurred

JarInputStream

Added in API level 1

JarInputStream(
    in: InputStream!, 
    verify: Boolean)

Creates a new JarInputStream and reads the optional manifest. If a manifest is present and verify is true, also attempts to verify the signatures if the JarInputStream is signed.

Parameters
`in`	InputStream!: the actual input stream
`verify`	Boolean: whether or not to verify the JarInputStream if it is signed.

Exceptions
`java.io.IOException`	if an I/O error has occurred

Public methods

getManifest

Added in API level 1

open fun getManifest(): Manifest!

Returns the Manifest for this JAR file, or null if none.

Return
`Manifest!`	the `Manifest` for this JAR file, or `null` if none.

getNextEntry

Added in API level 1

open fun getNextEntry(): ZipEntry!

Reads the next ZIP file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.

Return
`ZipEntry!`	the next ZIP file entry, or null if there are no more entries

Exceptions
`java.util.zip.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 "/").
`java.io.IOException`	if an I/O error has occurred
`java.util.zip.ZipException`	if a ZIP file error has occurred
`java.io.IOException`	if an I/O error has occurred
`java.lang.SecurityException`	if any of the jar file entries are incorrectly signed.

getNextJarEntry

Added in API level 1

open fun getNextJarEntry(): JarEntry!

Reads the next JAR file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.

Return
`JarEntry!`	the next JAR file entry, or null if there are no more entries

Exceptions
`java.util.zip.ZipException`	if a ZIP file error has occurred
`java.io.IOException`	if an I/O error has occurred
`java.lang.SecurityException`	if any of the jar file entries are incorrectly signed.

read

Added in API level 1

open fun read(
    b: ByteArray!, 
    off: Int, 
    len: Int
): Int

Reads from the current JAR file 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. If verification has been enabled, any invalid signature on the current entry will be reported at some point before the end of the entry is reached.

Parameters
`b`	ByteArray!: 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 to read

Return
`Int`	the actual number of bytes read, or -1 if the end of the entry is reached

Exceptions
`java.io.IOException`	if an I/O error has occurred
`java.lang.NullPointerException`	if `b` is `null`.
`java.lang.IndexOutOfBoundsException`	if `off` is negative, `len` is negative, or `len` is greater than `b.length - off`
`java.util.zip.ZipException`	if a ZIP file error has occurred
`java.lang.NullPointerException`	If `b` is `null`.
`java.lang.IndexOutOfBoundsException`	If `off` is negative, `len` is negative, or `len` is greater than `b.length - off`
`java.util.zip.ZipException`	if a ZIP file error has occurred
`java.io.IOException`	if an I/O error has occurred
`java.lang.SecurityException`	if any of the jar file entries are incorrectly signed.

Protected methods

createZipEntry

Added in API level 1

protected open fun createZipEntry(name: String!): ZipEntry!

Creates a new JarEntry (ZipEntry) for the specified JAR file entry name. The manifest attributes of the specified JAR file entry name will be copied to the new JarEntry.

Parameters
`name`	String!: the name of the JAR/ZIP file entry

Return
`ZipEntry!`	the `JarEntry` object just created