proguard.io

Class ZipOutput

java.lang.Object

proguard.io.ZipOutput

public class ZipOutput
extends java.lang.Object

This class writes zip data to a given output stream. It returns a new output stream for each zip entry that is opened. An entry can be compressed or uncompressed. Uncompressed entries can be aligned to a multiple of a given number of bytes.

Multiple entries and output streams can be open at the same time. The entries are added to the central directory in the order in which they are opened, but the corresponding data are only written when their output streams are closed.

The code automatically computes the CRC and lengths of the data, for compressed and uncompressed data.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.io.DataOutputStream	outputStream

Constructor Summary

Constructors

Constructor and Description
ZipOutput(java.io.DataOutputStream outputStream, byte[] header, int uncompressedAlignment, java.lang.String comment) Creates a new ZipOutput that aligns uncompressed entries and contains a comment.
ZipOutput(java.io.DataOutputStream outputStream, int uncompressedAlignment, java.lang.String comment) Creates a new ZipOutput that aligns uncompressed entries and contains a comment.
ZipOutput(java.io.OutputStream outputStream) Creates a new ZipOutput.
ZipOutput(java.io.OutputStream outputStream, byte[] header, int uncompressedAlignment) Creates a new ZipOutput that aligns uncompressed entries.
ZipOutput(java.io.OutputStream outputStream, byte[] header, int uncompressedAlignment, java.lang.String comment) Creates a new ZipOutput that aligns uncompressed entries and contains a comment.
ZipOutput(java.io.OutputStream outputStream, int uncompressedAlignment) Creates a new ZipOutput that aligns uncompressed entries.
ZipOutput(java.io.OutputStream outputStream, int uncompressedAlignment, java.lang.String comment) Creates a new ZipOutput that aligns uncompressed entries and contains a comment.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the zip archive, writing out its central directory and closing the underlying output stream.
void	close(long centralDirectoryOffset) Closes the zip archive, writing out its central directory and closing the underlying output stream.
java.io.OutputStream	createOutputStream(java.lang.String name, boolean compress, int modificationTime) Creates a new zip entry, returning an output stream to write its data.
java.io.OutputStream	createOutputStream(java.lang.String name, boolean compress, int uncompressedAlignment, int modificationTime) Creates a new zip entry, returning an output stream to write its data.
java.io.OutputStream	createOutputStream(java.lang.String name, boolean compress, int uncompressedAlignment, int modificationTime, byte[] extraField, java.lang.String comment) Creates a new zip entry, returning an output stream to write its data.
static void	main(java.lang.String[] args) Provides a simple test for this class, creating a zip file with the given name and a few aligned/compressed/uncompressed zip entries.
protected long	size() Returns the current size of the data written to the output stream.
protected void	writeEndOfCentralDirectory(long centralDirectoryOffset, long centralDirectorySize) Ends the central directory.
protected long	writeEntriesOfCentralDirectory() Writes the zip entries in the central directory.
protected void	writeInt(int value) Writes out a little-endian int value to the zip output stream.
protected void	writeInt(long value) Writes out a little-endian int value to the zip output stream.
protected void	writeLong(long value) Writes out a little-endian long value to the zip output stream.
protected void	writeShort(int value) Writes out a little-endian short value to the zip output stream.
protected long	writeStartOfCentralDirectory() Starts the central directory.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

outputStream

protected java.io.DataOutputStream outputStream

Constructor Detail

ZipOutput

public ZipOutput(java.io.OutputStream outputStream)

Creates a new ZipOutput.

Parameters:

outputStream - the output stream to which the zip data will be written.

ZipOutput

public ZipOutput(java.io.OutputStream outputStream,
                 int uncompressedAlignment)

Creates a new ZipOutput that aligns uncompressed entries.

Parameters:

outputStream - the output stream to which the zip data will be written.

uncompressedAlignment - the default alignment of uncompressed data.

ZipOutput

public ZipOutput(java.io.OutputStream outputStream,
                 int uncompressedAlignment,
                 java.lang.String comment)

Creates a new ZipOutput that aligns uncompressed entries and contains a comment.

Parameters:

outputStream - the output stream to which the zip data will be written.

uncompressedAlignment - the default alignment of uncompressed data.

comment - optional comment for the entire zip file.

ZipOutput

public ZipOutput(java.io.DataOutputStream outputStream,
                 int uncompressedAlignment,
                 java.lang.String comment)

Creates a new ZipOutput that aligns uncompressed entries and contains a comment.

Parameters:

outputStream - the output stream to which the zip data will be written.

uncompressedAlignment - the default alignment of uncompressed data.

comment - optional comment for the entire zip file.

ZipOutput

public ZipOutput(java.io.OutputStream outputStream,
                 byte[] header,
                 int uncompressedAlignment)
          throws java.io.IOException

Creates a new ZipOutput that aligns uncompressed entries.

Parameters:

outputStream - the output stream to which the zip data will be written.

header - an optional header for the zip file.

uncompressedAlignment - the requested alignment of uncompressed data.

Throws:

java.io.IOException

ZipOutput

public ZipOutput(java.io.OutputStream outputStream,
                 byte[] header,
                 int uncompressedAlignment,
                 java.lang.String comment)
          throws java.io.IOException

Creates a new ZipOutput that aligns uncompressed entries and contains a comment.

Parameters:

outputStream - the output stream to which the zip data will be written.

header - an optional header for the zip file.

uncompressedAlignment - the requested alignment of uncompressed data.

comment - optional comment for the entire zip file.

Throws:

java.io.IOException

ZipOutput

public ZipOutput(java.io.DataOutputStream outputStream,
                 byte[] header,
                 int uncompressedAlignment,
                 java.lang.String comment)
          throws java.io.IOException

Creates a new ZipOutput that aligns uncompressed entries and contains a comment.

Parameters:

outputStream - the output stream to which the zip data will be written.

header - an optional header for the zip file.

uncompressedAlignment - the requested alignment of uncompressed data.

comment - optional comment for the entire zip file.

Throws:

java.io.IOException

Method Detail

createOutputStream

public java.io.OutputStream createOutputStream(java.lang.String name,
                                               boolean compress,
                                               int modificationTime)
                                        throws java.io.IOException

Creates a new zip entry, returning an output stream to write its data. It is the caller's responsibility to close the output stream.

Parameters:

name - the name of the zip entry.

compress - specifies whether the entry should be compressed with the default alignment.

modificationTime - the modification date and time of the zip entry, in DOS format.

Returns:

an output stream for writing the data of the zip entry.

Throws:

java.io.IOException

createOutputStream

public java.io.OutputStream createOutputStream(java.lang.String name,
                                               boolean compress,
                                               int uncompressedAlignment,
                                               int modificationTime)
                                        throws java.io.IOException

Creates a new zip entry, returning an output stream to write its data. It is the caller's responsibility to close the output stream.

Parameters:

name - the name of the zip entry.

compress - specifies whether the entry should be compressed.

uncompressedAlignment - the requested alignment of uncompressed data.

modificationTime - the modification date and time of the zip entry, in DOS format.

Returns:

an output stream for writing the data of the zip entry.

Throws:

java.io.IOException

createOutputStream

public java.io.OutputStream createOutputStream(java.lang.String name,
                                               boolean compress,
                                               int uncompressedAlignment,
                                               int modificationTime,
                                               byte[] extraField,
                                               java.lang.String comment)
                                        throws java.io.IOException

Creates a new zip entry, returning an output stream to write its data. It is the caller's responsibility to close the output stream.

Parameters:

name - the name of the zip entry.

compress - specifies whether the entry should be compressed.

uncompressedAlignment - the requested alignment of uncompressed data.

modificationTime - the modification date and time of the zip entry, in DOS format.

extraField - optional extra field data. These should contain chunks, each with a short ID, a short length (little endian), and their corresponding data. The IDs 0-31 are reserved for Pkware. Java's jar tool just specifies an ID 0xcafe on its first entry.

comment - an optional comment.

Returns:

an output stream for writing the data of the zip entry.

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Closes the zip archive, writing out its central directory and closing the underlying output stream.

Throws:

java.io.IOException

close

public void close(long centralDirectoryOffset)
           throws java.io.IOException

Closes the zip archive, writing out its central directory and closing the underlying output stream.

Throws:

java.io.IOException

size

protected long size()

Returns the current size of the data written to the output stream.

writeStartOfCentralDirectory

protected long writeStartOfCentralDirectory()

Starts the central directory.

Returns:

the current position in the output stream.

writeEntriesOfCentralDirectory

protected long writeEntriesOfCentralDirectory()
                                       throws java.io.IOException

Writes the zip entries in the central directory.

Returns:

the total size of the directory entries.

Throws:

java.io.IOException

writeEndOfCentralDirectory

protected void writeEndOfCentralDirectory(long centralDirectoryOffset,
                                          long centralDirectorySize)
                                   throws java.io.IOException

Ends the central directory.

Parameters:

centralDirectoryOffset - the offset of the central directory.

centralDirectorySize - the size of the central directory, not counting the empty header and the trailer.

Throws:

java.io.IOException

writeShort

protected void writeShort(int value)
                   throws java.io.IOException

Writes out a little-endian short value to the zip output stream.

Throws:

java.io.IOException

writeInt

protected void writeInt(int value)
                 throws java.io.IOException

Writes out a little-endian int value to the zip output stream.

Throws:

java.io.IOException

writeInt

protected void writeInt(long value)
                 throws java.io.IOException

Writes out a little-endian int value to the zip output stream.

Throws:

java.io.IOException

writeLong

protected void writeLong(long value)
                  throws java.io.IOException

Writes out a little-endian long value to the zip output stream.

Throws:

java.io.IOException

main

public static void main(java.lang.String[] args)

Provides a simple test for this class, creating a zip file with the given name and a few aligned/compressed/uncompressed zip entries.