GZIPDecompressorInputStream Class Reference

This stream will decompress a source-stream using zlib. More...

#include <juce_GZIPDecompressorInputStream.h>

Inheritance diagram for GZIPDecompressorInputStream:

Collaboration diagram for GZIPDecompressorInputStream:

Public Types
enum	Format {   zlibFormat = 0,   deflateFormat,   gzipFormat }

Public Member Functions
	GZIPDecompressorInputStream (InputStream *sourceStream, bool deleteSourceWhenDestroyed, Format sourceFormat=zlibFormat, int64 uncompressedStreamLength=-1)
	Creates a decompressor stream. More...
	GZIPDecompressorInputStream (InputStream &sourceStream)
	Creates a decompressor stream. More...
	~GZIPDecompressorInputStream ()
	Destructor. More...
int64	getNumBytesRemaining ()
	Returns the number of bytes available for reading, or a negative value if the remaining length is not known. More...
int64	getPosition () override
	Returns the offset of the next byte that will be read from the stream. More...
int64	getTotalLength () override
	Returns the total number of bytes available for reading in this stream. More...
bool	isExhausted () override
	Returns true if the stream has no more data to read. More...
int	read (void *destBuffer, int maxBytesToRead) override
	Reads some data from the stream into a memory buffer. More...
virtual bool	readBool ()
	Reads a boolean from the stream. More...
virtual char	readByte ()
	Reads a byte from the stream. More...
virtual int	readCompressedInt ()
	Reads an encoded 32-bit number from the stream using a space-saving compressed format. More...
virtual double	readDouble ()
	Reads eight bytes as a 64-bit floating point value. More...
virtual double	readDoubleBigEndian ()
	Reads eight bytes as a 64-bit floating point value. More...
virtual String	readEntireStreamAsString ()
	Tries to read the whole stream and turn it into a string. More...
virtual float	readFloat ()
	Reads four bytes as a 32-bit floating point value. More...
virtual float	readFloatBigEndian ()
	Reads four bytes as a 32-bit floating point value. More...
virtual int	readInt ()
	Reads four bytes from the stream as a little-endian 32-bit value. More...
virtual int64	readInt64 ()
	Reads eight bytes from the stream as a little-endian 64-bit value. More...
virtual int64	readInt64BigEndian ()
	Reads eight bytes from the stream as a big-endian 64-bit value. More...
virtual int	readIntBigEndian ()
	Reads four bytes from the stream as a big-endian 32-bit value. More...
virtual size_t	readIntoMemoryBlock (MemoryBlock &destBlock, ssize_t maxNumBytesToRead=-1)
	Reads from the stream and appends the data to a MemoryBlock. More...
virtual String	readNextLine ()
	Reads a UTF-8 string from the stream, up to the next linefeed or carriage return. More...
virtual short	readShort ()
	Reads two bytes from the stream as a little-endian 16-bit value. More...
virtual short	readShortBigEndian ()
	Reads two bytes from the stream as a little-endian 16-bit value. More...
virtual String	readString ()
	Reads a zero-terminated UTF-8 string from the stream. More...
bool	setPosition (int64 pos) override
	Tries to move the current read position of the stream. More...
virtual void	skipNextBytes (int64 numBytesToSkip)
	Reads and discards a number of bytes from the stream. More...

Private Attributes
int	activeBufferSize
HeapBlock< uint8 >	buffer
int64	currentPos
const Format	format
ScopedPointer< GZIPDecompressHelper >	helper
bool	isEof
int64	originalSourcePos
OptionalScopedPointer< InputStream >	sourceStream
const int64	uncompressedStreamLength

Friends
struct	ContainerDeletePolicy< GZIPDecompressHelper >

Detailed Description

This stream will decompress a source-stream using zlib.

Tip: if you're reading lots of small items from one of these streams, you can increase the performance enormously by passing it through a BufferedInputStream, so that it has to read larger blocks less often.

See also

GZIPCompressorOutputStream

Member Enumeration Documentation

Format

enum GZIPDecompressorInputStream::Format

Enumerator
zlibFormat
deflateFormat
gzipFormat

Constructor & Destructor Documentation

GZIPDecompressorInputStream() [1/2]

GZIPDecompressorInputStream::GZIPDecompressorInputStream	(	InputStream *	sourceStream,
		bool	deleteSourceWhenDestroyed,
		Format	sourceFormat = zlibFormat,
		int64	uncompressedStreamLength = -1
	)

Creates a decompressor stream.

Parameters

sourceStream	the stream to read from
deleteSourceWhenDestroyed	whether or not to delete the source stream when this object is destroyed
sourceFormat	can be used to select which of the supported formats the data is expected to be in
uncompressedStreamLength	if the creator knows the length that the uncompressed stream will be, then it can supply this value, which will be returned by getTotalLength()

GZIPDecompressorInputStream() [2/2]

GZIPDecompressorInputStream::GZIPDecompressorInputStream

(

InputStream &

sourceStream

)

Creates a decompressor stream.

Parameters

sourceStream

the stream to read from - the source stream must not be deleted until this object has been destroyed

~GZIPDecompressorInputStream()

GZIPDecompressorInputStream::~GZIPDecompressorInputStream

(

)

Destructor.

Member Function Documentation

getNumBytesRemaining()

int64 InputStream::getNumBytesRemaining ( )

inherited

Returns the number of bytes available for reading, or a negative value if the remaining length is not known.

See also

getTotalLength

getPosition()

int64 GZIPDecompressorInputStream::getPosition ( )

overridevirtual

Returns the offset of the next byte that will be read from the stream.

See also

setPosition

Implements InputStream.

getTotalLength()

int64 GZIPDecompressorInputStream::getTotalLength ( )

overridevirtual

Returns the total number of bytes available for reading in this stream.

Note that this is the number of bytes available from the start of the stream, not from the current position.

If the size of the stream isn't actually known, this will return -1.

See also

getNumBytesRemaining

Implements InputStream.

isExhausted()

bool GZIPDecompressorInputStream::isExhausted ( )

overridevirtual

Returns true if the stream has no more data to read.

Implements InputStream.

read()

int GZIPDecompressorInputStream::read ( void *  destBuffer, int  maxBytesToRead  )

overridevirtual

Reads some data from the stream into a memory buffer.

This is the only read method that subclasses actually need to implement, as the InputStream base class implements the other read methods in terms of this one (although it's often more efficient for subclasses to implement them directly).

Parameters

destBuffer	the destination buffer for the data. This must not be null.
maxBytesToRead	the maximum number of bytes to read - make sure the memory block passed in is big enough to contain this many bytes. This value must not be negative.

Returns

the actual number of bytes that were read, which may be less than maxBytesToRead if the stream is exhausted before it gets that far

Implements InputStream.

readBool()

virtual bool InputStream::readBool ( )

virtualinherited

Reads a boolean from the stream.

The bool is encoded as a single byte - non-zero for true, 0 for false. If the stream is exhausted, this will return false.

See also

OutputStream::writeBool

readByte()

virtual char InputStream::readByte ( )

virtualinherited

Reads a byte from the stream.

If the stream is exhausted, this will return zero.

See also

OutputStream::writeByte

readCompressedInt()

virtual int InputStream::readCompressedInt ( )

virtualinherited

Reads an encoded 32-bit number from the stream using a space-saving compressed format.

For small values, this is more space-efficient than using readInt() and OutputStream::writeInt() The format used is: number of significant bytes + up to 4 bytes in little-endian order.

See also

OutputStream::writeCompressedInt()

readDouble()

virtual double InputStream::readDouble ( )

virtualinherited

Reads eight bytes as a 64-bit floating point value.

The raw 64-bit encoding of the double is read from the stream as a little-endian int64. If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeDouble, readFloat

readDoubleBigEndian()

virtual double InputStream::readDoubleBigEndian ( )

virtualinherited

Reads eight bytes as a 64-bit floating point value.

The raw 64-bit encoding of the double is read from the stream as a big-endian int64. If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeDoubleBigEndian, readFloatBigEndian

readEntireStreamAsString()

virtual String InputStream::readEntireStreamAsString ( )

virtualinherited

Tries to read the whole stream and turn it into a string.

This will read from the stream's current position until the end-of-stream. It can read from UTF-8 data, or UTF-16 if it detects suitable header-bytes.

readFloat()

virtual float InputStream::readFloat ( )

virtualinherited

Reads four bytes as a 32-bit floating point value.

The raw 32-bit encoding of the float is read from the stream as a little-endian int. If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeFloat, readDouble

readFloatBigEndian()

virtual float InputStream::readFloatBigEndian ( )

virtualinherited

Reads four bytes as a 32-bit floating point value.

The raw 32-bit encoding of the float is read from the stream as a big-endian int. If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeFloatBigEndian, readDoubleBigEndian

readInt()

virtual int InputStream::readInt ( )

virtualinherited

Reads four bytes from the stream as a little-endian 32-bit value.

If the next four bytes are byte1 to byte4, this returns (byte1 | (byte2 << 8) | (byte3 << 16) | (byte4 << 24)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeInt, readIntBigEndian

readInt64()

virtual int64 InputStream::readInt64 ( )

virtualinherited

Reads eight bytes from the stream as a little-endian 64-bit value.

If the next eight bytes are byte1 to byte8, this returns (byte1 | (byte2 << 8) | (byte3 << 16) | (byte4 << 24) | (byte5 << 32) | (byte6 << 40) | (byte7 << 48) | (byte8 << 56)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeInt64, readInt64BigEndian

readInt64BigEndian()

virtual int64 InputStream::readInt64BigEndian ( )

virtualinherited

Reads eight bytes from the stream as a big-endian 64-bit value.

If the next eight bytes are byte1 to byte8, this returns (byte8 | (byte7 << 8) | (byte6 << 16) | (byte5 << 24) | (byte4 << 32) | (byte3 << 40) | (byte2 << 48) | (byte1 << 56)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeInt64BigEndian, readInt64

readIntBigEndian()

virtual int InputStream::readIntBigEndian ( )

virtualinherited

Reads four bytes from the stream as a big-endian 32-bit value.

If the next four bytes are byte1 to byte4, this returns (byte4 | (byte3 << 8) | (byte2 << 16) | (byte1 << 24)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeIntBigEndian, readInt

readIntoMemoryBlock()

virtual size_t InputStream::readIntoMemoryBlock ( MemoryBlock &  destBlock, ssize_t  maxNumBytesToRead = -1  )

virtualinherited

Reads from the stream and appends the data to a MemoryBlock.

Parameters

destBlock	the block to append the data onto
maxNumBytesToRead	if this is a positive value, it sets a limit to the number of bytes that will be read - if it's negative, data will be read until the stream is exhausted.

Returns

the number of bytes that were added to the memory block

readNextLine()

virtual String InputStream::readNextLine ( )

virtualinherited

Reads a UTF-8 string from the stream, up to the next linefeed or carriage return.

This will read up to the next "\n" or "\r\n" or end-of-stream.

After this call, the stream's position will be left pointing to the next character following the line-feed, but the linefeeds aren't included in the string that is returned.

readShort()

virtual short InputStream::readShort ( )

virtualinherited

Reads two bytes from the stream as a little-endian 16-bit value.

If the next two bytes read are byte1 and byte2, this returns (byte1 | (byte2 << 8)). If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeShort, readShortBigEndian

readShortBigEndian()

virtual short InputStream::readShortBigEndian ( )

virtualinherited

Reads two bytes from the stream as a little-endian 16-bit value.

If the next two bytes read are byte1 and byte2, this returns (byte2 | (byte1 << 8)). If the stream is exhausted partway through reading the bytes, this will return zero.

See also

OutputStream::writeShortBigEndian, readShort

readString()

virtual String InputStream::readString ( )

virtualinherited

Reads a zero-terminated UTF-8 string from the stream.

This will read characters from the stream until it hits a null character or end-of-stream.

See also

OutputStream::writeString, readEntireStreamAsString

Reimplemented in BufferedInputStream.

setPosition()

bool GZIPDecompressorInputStream::setPosition ( int64  newPosition )

overridevirtual

Tries to move the current read position of the stream.

The position is an absolute number of bytes from the stream's start.

Some streams might not be able to do this, in which case they should do nothing and return false. Others might be able to manage it by resetting themselves and skipping to the correct position, although this is obviously a bit slow.

Returns

true if the stream manages to reposition itself correctly

See also

getPosition

Implements InputStream.

skipNextBytes()

virtual void InputStream::skipNextBytes ( int64  numBytesToSkip )

virtualinherited

Reads and discards a number of bytes from the stream.

Some input streams might implement this efficiently, but the base class will just keep reading data until the requisite number of bytes have been done.

Friends And Related Function Documentation

ContainerDeletePolicy< GZIPDecompressHelper >

friend struct ContainerDeletePolicy< GZIPDecompressHelper >

friend

Member Data Documentation

activeBufferSize

int GZIPDecompressorInputStream::activeBufferSize

private

buffer

HeapBlock<uint8> GZIPDecompressorInputStream::buffer

private

currentPos

int64 GZIPDecompressorInputStream::currentPos

private

format

const Format GZIPDecompressorInputStream::format

private

helper

ScopedPointer<GZIPDecompressHelper> GZIPDecompressorInputStream::helper

private

isEof

bool GZIPDecompressorInputStream::isEof

private

originalSourcePos

int64 GZIPDecompressorInputStream::originalSourcePos

private

sourceStream

OptionalScopedPointer<InputStream> GZIPDecompressorInputStream::sourceStream

private

uncompressedStreamLength

const int64 GZIPDecompressorInputStream::uncompressedStreamLength

private

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

• juce_GZIPDecompressorInputStream.h