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juce::GZIPCompressorOutputStream Class Reference

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

#include <juce_GZIPCompressorOutputStream.h>

Inheritance diagram for juce::GZIPCompressorOutputStream:
Collaboration diagram for juce::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, int windowBits=0)
 Creates a compression stream. More...
 
 GZIPCompressorOutputStream (OutputStream *destStream, int compressionLevel=-1, bool deleteDestStreamWhenDestroyed=false, int windowBits=0)
 Creates a compression stream. More...
 
 ~GZIPCompressorOutputStream () override
 Destructor. More...
 
void flush () override
 Flushes and closes the stream. More...
 
const StringgetNewLineString () 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, const char *lineEndings)
 Writes a string of text to the stream. More...
 

Private Attributes

OptionalScopedPointer< OutputStreamdestStream
 
std::unique_ptr< GZIPCompressorHelper > helper
 

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

{Core}

Member Enumeration Documentation

◆ 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() [1/2]

juce::GZIPCompressorOutputStream::GZIPCompressorOutputStream ( OutputStream destStream,
int  compressionLevel = -1,
int  windowBits = 0 
)

Creates a compression stream.

Parameters
destStreamthe stream into which the compressed data will be written
compressionLevelhow 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.
windowBitsthis 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() [2/2]

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

Creates a compression stream.

Parameters
destStreamthe stream into which the compressed data will be written. Ownership of this object depends on the value of deleteDestStreamWhenDestroyed
compressionLevelhow 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.
deleteDestStreamWhenDestroyedwhether or not the GZIPCompressorOutputStream will delete the destStream object when it is destroyed
windowBitsthis 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()

juce::GZIPCompressorOutputStream::~GZIPCompressorOutputStream ( )
override

Destructor.

Member Function Documentation

◆ flush()

void juce::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 juce::OutputStream.

◆ getNewLineString()

const String& juce::OutputStream::getNewLineString ( ) const
inlinenoexceptinherited

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

◆ getPosition()

int64 juce::GZIPCompressorOutputStream::getPosition ( )
overridevirtual

Returns the stream's current position.

See also
setPosition

Implements juce::OutputStream.

◆ setNewLineString()

void juce::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 juce::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 juce::OutputStream.

◆ write()

bool juce::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
dataToWritethe target buffer to receive the data. This must not be null.
numberOfBytesthe number of bytes to write.
Returns
false if the write operation fails for some reason

Implements juce::OutputStream.

◆ writeBool()

virtual bool juce::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 juce::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 juce::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 juce::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 juce::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 juce::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 juce::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 juce::OutputStream::writeFromInputStream ( InputStream source,
int64  maxNumBytesToWrite 
)
virtualinherited

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

Parameters
sourcethe stream to read from
maxNumBytesToWritethe 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 juce::MemoryOutputStream.

◆ writeInt()

virtual bool juce::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 juce::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 juce::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 juce::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 juce::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 juce::MemoryOutputStream, and juce::FileOutputStream.

◆ writeShort()

virtual bool juce::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 juce::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 juce::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 juce::OutputStream::writeText ( const String text,
bool  asUTF16,
bool  writeUTF16ByteOrderMark,
const char *  lineEndings 
)
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).

If lineEndings is nullptr, then line endings in the text won't be modified. If you pass "\\n" or "\\r\\n" then this function will replace any existing line feeds.

Returns
false if the write operation fails for some reason

Member Data Documentation

◆ destStream

OptionalScopedPointer<OutputStream> juce::GZIPCompressorOutputStream::destStream
private

◆ helper

std::unique_ptr<GZIPCompressorHelper> juce::GZIPCompressorOutputStream::helper
private

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