GZIPCompressorOutputStream Class Reference

A stream which uses zlib to compress the data written into it. More...

#include <juce_GZIPCompressorOutputStream.h>

Inheritance diagram for GZIPCompressorOutputStream:

Collaboration diagram for GZIPCompressorOutputStream:

Public Types
enum	WindowBitsValues {   windowBitsRaw = -15,   windowBitsGZIP = 15 + 16 }
	These are preset values that can be used for the constructor's windowBits parameter. More...

Public Member Functions
	GZIPCompressorOutputStream (OutputStream *destStream, int compressionLevel=-1, bool deleteDestStreamWhenDestroyed=false, int windowBits=0)
	Creates a compression stream. More...
	~GZIPCompressorOutputStream ()
	Destructor. More...
void	flush () override
	Flushes and closes the stream. More...
const String &	getNewLineString () const noexcept
	Returns the current new-line string that was set by setNewLineString(). More...
int64	getPosition () override
	Returns the stream's current position. More...
void	setNewLineString (const String &newLineString)
	Sets the string to write to the stream when a new line is written. More...
bool	setPosition (int64) override
	Tries to move the stream's output position. More...
bool	write (const void *, size_t) override
	Writes a block of data to the stream. More...
virtual bool	writeBool (bool boolValue)
	Writes a boolean to the stream as a single byte. More...
virtual bool	writeByte (char byte)
	Writes a single byte to the stream. More...
virtual bool	writeCompressedInt (int value)
	Writes a condensed binary encoding of a 32-bit integer. More...
virtual bool	writeDouble (double value)
	Writes a 64-bit floating point value to the stream in a binary format. More...
virtual bool	writeDoubleBigEndian (double value)
	Writes a 64-bit floating point value to the stream in a binary format. More...
virtual bool	writeFloat (float value)
	Writes a 32-bit floating point value to the stream in a binary format. More...
virtual bool	writeFloatBigEndian (float value)
	Writes a 32-bit floating point value to the stream in a binary format. More...
virtual int64	writeFromInputStream (InputStream &source, int64 maxNumBytesToWrite)
	Reads data from an input stream and writes it to this stream. More...
virtual bool	writeInt (int value)
	Writes a 32-bit integer to the stream in a little-endian byte order. More...
virtual bool	writeInt64 (int64 value)
	Writes a 64-bit integer to the stream in a little-endian byte order. More...
virtual bool	writeInt64BigEndian (int64 value)
	Writes a 64-bit integer to the stream in a big-endian byte order. More...
virtual bool	writeIntBigEndian (int value)
	Writes a 32-bit integer to the stream in a big-endian byte order. More...
virtual bool	writeRepeatedByte (uint8 byte, size_t numTimesToRepeat)
	Writes a byte to the output stream a given number of times. More...
virtual bool	writeShort (short value)
	Writes a 16-bit integer to the stream in a little-endian byte order. More...
virtual bool	writeShortBigEndian (short value)
	Writes a 16-bit integer to the stream in a big-endian byte order. More...
virtual bool	writeString (const String &text)
	Stores a string in the stream in a binary format. More...
virtual bool	writeText (const String &text, bool asUTF16, bool writeUTF16ByteOrderMark)
	Writes a string of text to the stream. More...

Private Attributes
OptionalScopedPointer< OutputStream >	destStream
ScopedPointer< GZIPCompressorHelper >	helper

Friends
struct	ContainerDeletePolicy< GZIPCompressorHelper >

Detailed Description

A stream which uses zlib to compress the data written into it.

Important note: When you call flush() on a GZIPCompressorOutputStream, the gzip data is closed - this means that no more data can be written to it, and any subsequent attempts to call write() will cause an assertion.

See also

GZIPDecompressorInputStream

Member Enumeration Documentation

WindowBitsValues

enum GZIPCompressorOutputStream::WindowBitsValues

These are preset values that can be used for the constructor's windowBits parameter.

For more info about this, see the zlib documentation for its windowBits parameter.

Enumerator
windowBitsRaw
windowBitsGZIP

Constructor & Destructor Documentation

GZIPCompressorOutputStream()

GZIPCompressorOutputStream::GZIPCompressorOutputStream	(	OutputStream *	destStream,
		int	compressionLevel = -1,
		bool	deleteDestStreamWhenDestroyed = false,
		int	windowBits = 0
	)

Creates a compression stream.

Parameters

destStream	the stream into which the compressed data should be written
compressionLevel	how much to compress the data, between 0 and 9, where 0 is non-compressed storage, 1 is the fastest/lowest compression, and 9 is the slowest/highest compression. Any value outside this range indicates that a default compression level should be used.
deleteDestStreamWhenDestroyed	whether or not to delete the destStream object when this stream is destroyed
windowBits	this is used internally to change the window size used by zlib - leave it as 0 unless you specifically need to set its value for some reason

~GZIPCompressorOutputStream()

GZIPCompressorOutputStream::~GZIPCompressorOutputStream

(

)

Destructor.

Member Function Documentation

flush()

void GZIPCompressorOutputStream::flush ( )

overridevirtual

Flushes and closes the stream.

Note that unlike most streams, when you call flush() on a GZIPCompressorOutputStream, the stream is closed - this means that no more data can be written to it, and any subsequent attempts to call write() will cause an assertion.

Implements OutputStream.

getNewLineString()

const String& OutputStream::getNewLineString ( ) const

inlinenoexceptinherited

Returns the current new-line string that was set by setNewLineString().

getPosition()

int64 GZIPCompressorOutputStream::getPosition ( )

overridevirtual

Returns the stream's current position.

See also

setPosition

Implements OutputStream.

setNewLineString()

void OutputStream::setNewLineString ( const String &  newLineString )

inherited

Sets the string to write to the stream when a new line is written.

By default this will be set the value of NewLine::getDefault().

setPosition()

bool GZIPCompressorOutputStream::setPosition ( int64  newPosition )

overridevirtual

Tries to move the stream's output position.

Not all streams will be able to seek to a new position - this will return false if it fails to work.

See also

getPosition

Implements OutputStream.

write()

bool GZIPCompressorOutputStream::write ( const void *  dataToWrite, size_t  numberOfBytes  )

overridevirtual

Writes a block of data to the stream.

When creating a subclass of OutputStream, this is the only write method that needs to be overloaded - the base class has methods for writing other types of data which use this to do the work.

Parameters

dataToWrite	the target buffer to receive the data. This must not be null.
numberOfBytes	the number of bytes to write.

Returns

false if the write operation fails for some reason

Implements OutputStream.

writeBool()

virtual bool OutputStream::writeBool ( bool  boolValue )

virtualinherited

Writes a boolean to the stream as a single byte.

This is encoded as a binary byte (not as text) with a value of 1 or 0.

Returns

false if the write operation fails for some reason

See also

InputStream::readBool

writeByte()

virtual bool OutputStream::writeByte ( char  byte )

virtualinherited

Writes a single byte to the stream.

Returns

false if the write operation fails for some reason

See also

InputStream::readByte

writeCompressedInt()

virtual bool OutputStream::writeCompressedInt ( int  value )

virtualinherited

Writes a condensed binary encoding of a 32-bit integer.

If you're storing a lot of integers which are unlikely to have very large values, this can save a lot of space, because values under 0xff will only take up 2 bytes, under 0xffff only 3 bytes, etc.

The format used is: number of significant bytes + up to 4 bytes in little-endian order.

Returns

false if the write operation fails for some reason

See also

InputStream::readCompressedInt

writeDouble()

virtual bool OutputStream::writeDouble ( double  value )

virtualinherited

Writes a 64-bit floating point value to the stream in a binary format.

The eight raw bytes of the double value are written out as a little-endian 64-bit int.

Returns

false if the write operation fails for some reason

See also

InputStream::readDouble

writeDoubleBigEndian()

virtual bool OutputStream::writeDoubleBigEndian ( double  value )

virtualinherited

Writes a 64-bit floating point value to the stream in a binary format.

The eight raw bytes of the double value are written out as a big-endian 64-bit int.

See also

InputStream::readDoubleBigEndian

Returns

false if the write operation fails for some reason

writeFloat()

virtual bool OutputStream::writeFloat ( float  value )

virtualinherited

Writes a 32-bit floating point value to the stream in a binary format.

The binary 32-bit encoding of the float is written as a little-endian int.

Returns

false if the write operation fails for some reason

See also

InputStream::readFloat

writeFloatBigEndian()

virtual bool OutputStream::writeFloatBigEndian ( float  value )

virtualinherited

Writes a 32-bit floating point value to the stream in a binary format.

The binary 32-bit encoding of the float is written as a big-endian int.

Returns

false if the write operation fails for some reason

See also

InputStream::readFloatBigEndian

writeFromInputStream()

virtual int64 OutputStream::writeFromInputStream ( InputStream &  source, int64  maxNumBytesToWrite  )

virtualinherited

Reads data from an input stream and writes it to this stream.

Parameters

source	the stream to read from
maxNumBytesToWrite	the number of bytes to read from the stream (if this is less than zero, it will keep reading until the input is exhausted)

Returns

the number of bytes written

Reimplemented in MemoryOutputStream.

Referenced by MemoryOutputStream::getPosition().

writeInt()

virtual bool OutputStream::writeInt ( int  value )

virtualinherited

Writes a 32-bit integer to the stream in a little-endian byte order.

Returns

false if the write operation fails for some reason

See also

InputStream::readInt

writeInt64()

virtual bool OutputStream::writeInt64 ( int64  value )

virtualinherited

Writes a 64-bit integer to the stream in a little-endian byte order.

Returns

false if the write operation fails for some reason

See also

InputStream::readInt64

writeInt64BigEndian()

virtual bool OutputStream::writeInt64BigEndian ( int64  value )

virtualinherited

Writes a 64-bit integer to the stream in a big-endian byte order.

Returns

false if the write operation fails for some reason

See also

InputStream::readInt64BigEndian

writeIntBigEndian()

virtual bool OutputStream::writeIntBigEndian ( int  value )

virtualinherited

Writes a 32-bit integer to the stream in a big-endian byte order.

Returns

false if the write operation fails for some reason

See also

InputStream::readIntBigEndian

writeRepeatedByte()

virtual bool OutputStream::writeRepeatedByte ( uint8  byte, size_t  numTimesToRepeat  )

virtualinherited

Writes a byte to the output stream a given number of times.

Returns

false if the write operation fails for some reason

Reimplemented in MemoryOutputStream, and FileOutputStream.

Referenced by MemoryOutputStream::getPosition(), and FileOutputStream::openedOk().

writeShort()

virtual bool OutputStream::writeShort ( short  value )

virtualinherited

Writes a 16-bit integer to the stream in a little-endian byte order.

This will write two bytes to the stream: (value & 0xff), then (value >> 8).

Returns

false if the write operation fails for some reason

See also

InputStream::readShort

writeShortBigEndian()

virtual bool OutputStream::writeShortBigEndian ( short  value )

virtualinherited

Writes a 16-bit integer to the stream in a big-endian byte order.

This will write two bytes to the stream: (value >> 8), then (value & 0xff).

Returns

false if the write operation fails for some reason

See also

InputStream::readShortBigEndian

writeString()

virtual bool OutputStream::writeString ( const String &  text )

virtualinherited

Stores a string in the stream in a binary format.

This isn't the method to use if you're trying to append text to the end of a text-file! It's intended for storing a string so that it can be retrieved later by InputStream::readString().

It writes the string to the stream as UTF8, including the null termination character.

For appending text to a file, instead use writeText, or operator<<

Returns

false if the write operation fails for some reason

See also

InputStream::readString, writeText, operator<<

writeText()

virtual bool OutputStream::writeText ( const String &  text, bool  asUTF16, bool  writeUTF16ByteOrderMark  )

virtualinherited

Writes a string of text to the stream.

It can either write the text as UTF-8 or UTF-16, and can also add the UTF-16 byte-order-mark bytes (0xff, 0xfe) to indicate the endianness (these should only be used at the start of a file).

The method also replaces '\n' characters in the text with '\r\n'.

Returns

false if the write operation fails for some reason

Friends And Related Function Documentation

ContainerDeletePolicy< GZIPCompressorHelper >

friend struct ContainerDeletePolicy< GZIPCompressorHelper >

friend

Member Data Documentation

destStream

OptionalScopedPointer<OutputStream> GZIPCompressorOutputStream::destStream

private

helper

ScopedPointer<GZIPCompressorHelper> GZIPCompressorOutputStream::helper

private

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

• juce_GZIPCompressorOutputStream.h