decaf::util::zip::Inflater Class Reference

This class uncompresses data that was compressed using the DEFLATE algorithm (see specification). More...

#include <src/main/decaf/util/zip/Inflater.h>

Public Member Functions
	Inflater ()
	Creates a new decompressor.
	Inflater (bool nowrap)
	Creates a new decompressor.
virtual	~Inflater ()
void	setInput (const unsigned char *buffer, int size, int offset, int length)
	Sets input data for decompression.
void	setInput (const std::vector< unsigned char > &buffer, int offset, int length)
	Sets input data for decompression.
void	setInput (const std::vector< unsigned char > &buffer)
	Sets input data for decompression.
int	getRemaining () const
	Returns the total number of bytes remaining in the input buffer.
void	setDictionary (const unsigned char *buffer, int size, int offset, int length)
	Sets the preset dictionary to the given array of bytes.
void	setDictionary (const std::vector< unsigned char > &buffer, int offset, int length)
	Sets the preset dictionary to the given array of bytes.
void	setDictionary (const std::vector< unsigned char > &buffer)
	Sets the preset dictionary to the given array of bytes.
bool	needsInput () const
bool	needsDictionary () const
void	finish ()
	When called, indicates that decompression should end with the current contents of the input buffer.
bool	finished () const
int	inflate (unsigned char *buffer, int size, int offset, int length)
	Uncompresses bytes into specified buffer.
int	inflate (std::vector< unsigned char > &buffer, int offset, int length)
	Uncompresses bytes into specified buffer.
int	inflate (std::vector< unsigned char > &buffer)
	Uncompresses bytes into specified buffer.
long long	getAdler () const
long long	getBytesRead () const
long long	getBytesWritten () const
void	reset ()
	Resets deflater so that a new set of input data can be processed.
void	end ()
	Closes the decompressor and discards any unprocessed input.

Detailed Description

This class uncompresses data that was compressed using the DEFLATE algorithm (see specification).

Basically this class is part of the API to the stream based ZLIB compression library and is used as such by InflaterInputStream and its descendants.

The typical usage of a Inflater outside this package consists of a specific call to one of its constructors before being passed to an instance of InflaterInputStream.

See Also

InflaterInputStream

Deflater

Since

1.0

Constructor & Destructor Documentation

decaf::util::zip::Inflater::Inflater

(

)

Creates a new decompressor.

This constructor defaults the inflater to use the ZLIB header and checksum fields.

decaf::util::zip::Inflater::Inflater

(

bool

nowrap

)

Creates a new decompressor.

If the parameter 'nowrap' is true then the ZLIB header and checksum fields will not be used. This provides compatibility with the compression format used by both GZIP and PKZIP.

Note: When using the 'nowrap' option it is also necessary to provide an extra "dummy" byte as input. This is required by the ZLIB native library in order to support certain optimizations.

virtual decaf::util::zip::Inflater::~Inflater ( )

virtual

Member Function Documentation

void decaf::util::zip::Inflater::end

(

)

Closes the decompressor and discards any unprocessed input.

This method should be called when the decompressor is no longer being used, but will also be called automatically by the destructor. Once this method is called, the behavior of the Inflater object is undefined.

void decaf::util::zip::Inflater::finish

(

)

When called, indicates that decompression should end with the current contents of the input buffer.

bool decaf::util::zip::Inflater::finished

(

)

const

Returns

true if the end of the compressed data output stream has been reached.

long long decaf::util::zip::Inflater::getAdler

(

)

const

Returns

the ADLER-32 value of the uncompressed data.

Exceptions

IllegalStateException

if in the end state.

long long decaf::util::zip::Inflater::getBytesRead

(

)

const

Returns

the total number of compressed bytes input so far.

Exceptions

IllegalStateException

if in the end state.

long long decaf::util::zip::Inflater::getBytesWritten

(

)

const

Returns

the total number of decompressed bytes output so far.

Exceptions

IllegalStateException

if in the end state.

int decaf::util::zip::Inflater::getRemaining

(

)

const

Returns the total number of bytes remaining in the input buffer.

This can be used to find out what bytes still remain in the input buffer after decompression has finished.

Returns

the total number of bytes remaining in the input buffer

int decaf::util::zip::Inflater::inflate	(	unsigned char *	buffer,
		int	size,
		int	offset,
		int	length
	)

Uncompresses bytes into specified buffer.

Returns actual number of bytes uncompressed. A return value of 0 indicates that needsInput() or needsDictionary() should be called in order to determine if more input data or a preset dictionary is required. In the latter case, getAdler() can be used to get the Adler-32 value of the dictionary required.

Parameters

buffer	The Buffer to write the compressed data to.
size	The size of the buffer passed in.
offset	The position in the Buffer to start writing at.
length	The maximum number of byte of data to write.

Exceptions

NullPointerException	if buffer is NULL.
IllegalStateException	if in the end state.
IndexOutOfBoundsException	if the offset + length > size of the buffer.
DataFormatException	if the compressed data format is invalid.

int decaf::util::zip::Inflater::inflate	(	std::vector< unsigned char > &	buffer,
		int	offset,
		int	length
	)

Uncompresses bytes into specified buffer.

Returns actual number of bytes uncompressed. A return value of 0 indicates that needsInput() or needsDictionary() should be called in order to determine if more input data or a preset dictionary is required. In the latter case, getAdler() can be used to get the Adler-32 value of the dictionary required.

Parameters

buffer	The Buffer to write the compressed data to.
offset	The position in the Buffer to start writing at.
length	The maximum number of byte of data to write.

Exceptions

IllegalStateException	if in the end state.
IndexOutOfBoundsException	if the offset + length > size of the buffer.
DataFormatException	if the compressed data format is invalid.

int decaf::util::zip::Inflater::inflate

(

std::vector< unsigned char > &

buffer

)

Uncompresses bytes into specified buffer.

Returns actual number of bytes uncompressed. A return value of 0 indicates that needsInput() or needsDictionary() should be called in order to determine if more input data or a preset dictionary is required. In the latter case, getAdler() can be used to get the Adler-32 value of the dictionary required.

Parameters

buffer

The Buffer to write the compressed data to.

Exceptions

IllegalStateException	if in the end state.
DataFormatException	if the compressed data format is invalid.

bool decaf::util::zip::Inflater::needsDictionary

(

)

const

Returns

true if a preset dictionary is needed for decompression.

bool decaf::util::zip::Inflater::needsInput

(

)

const

Returns

true if the input data buffer is empty and setInput() should be called in order to provide more input

void decaf::util::zip::Inflater::reset

(

)

Resets deflater so that a new set of input data can be processed.

Keeps current decompression level and strategy settings.

Exceptions

IllegalStateException

if in the end state.

void decaf::util::zip::Inflater::setDictionary	(	const unsigned char *	buffer,
		int	size,
		int	offset,
		int	length
	)

Sets the preset dictionary to the given array of bytes.

Should be called when inflate() returns 0 and needsDictionary() returns true indicating that a preset dictionary is required. The method getAdler() can be used to get the Adler-32 value of the dictionary needed.

Parameters

buffer	The Buffer to read in for decompression.
size	The size of the buffer passed in.
offset	The position in the Buffer to start reading from.
length	The number of bytes to read from the input buffer.

Exceptions

NullPointerException	if buffer is NULL.
IndexOutOfBoundsException	if the offset + length > size of the buffer.
IllegalStateException	if in the end state.
IllegalArgumentException	if the given dictionary doesn't match thre required dictionaries checksum value.

void decaf::util::zip::Inflater::setDictionary	(	const std::vector< unsigned char > &	buffer,
		int	offset,
		int	length
	)

Sets the preset dictionary to the given array of bytes.

Should be called when inflate() returns 0 and needsDictionary() returns true indicating that a preset dictionary is required. The method getAdler() can be used to get the Adler-32 value of the dictionary needed.

Parameters

buffer	The Buffer to read in for decompression.
offset	The position in the Buffer to start reading from.
length	The number of bytes to read from the input buffer.

Exceptions

IndexOutOfBoundsException	if the offset + length > size of the buffer.
IllegalStateException	if in the end state.
IllegalArgumentException	if the given dictionary doesn't match thre required dictionaries checksum value.

void decaf::util::zip::Inflater::setDictionary

(

const std::vector< unsigned char > &

buffer

)

Sets the preset dictionary to the given array of bytes.

Should be called when inflate() returns 0 and needsDictionary() returns true indicating that a preset dictionary is required. The method getAdler() can be used to get the Adler-32 value of the dictionary needed.

Parameters

buffer

The Buffer to read in for decompression.

Exceptions

IllegalStateException	if in the end state.
IllegalArgumentException	if the given dictionary doesn't match the required dictionaries checksum value.

void decaf::util::zip::Inflater::setInput	(	const unsigned char *	buffer,
		int	size,
		int	offset,
		int	length
	)

Sets input data for decompression.

This should be called whenever needsInput() returns true indicating that more input data is required.

Parameters

buffer	The Buffer to read in for decompression.
size	The size of the buffer passed in.
offset	The position in the Buffer to start reading from.
length	The number of bytes to read from the input buffer.

Exceptions

NullPointerException	if buffer is NULL.
IndexOutOfBoundsException	if the offset + length > size of the buffer.
IllegalStateException	if in the end state.

void decaf::util::zip::Inflater::setInput	(	const std::vector< unsigned char > &	buffer,
		int	offset,
		int	length
	)

Sets input data for decompression.

This should be called whenever needsInput() returns true indicating that more input data is required.

Parameters

buffer	The Buffer to read in for decompression.
offset	The position in the Buffer to start reading from.
length	The number of bytes to read from the input buffer.

Exceptions

IndexOutOfBoundsException	if the offset + length > size of the buffer.
IllegalStateException	if in the end state.

void decaf::util::zip::Inflater::setInput

(

const std::vector< unsigned char > &

buffer

)

Sets input data for decompression.

This should be called whenever needsInput() returns true indicating that more input data is required.

Parameters

buffer

The Buffer to read in for decompression.

Exceptions

IllegalStateException

if in the end state.

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The documentation for this class was generated from the following file:

• src/main/decaf/util/zip/Inflater.h