OpenShot Library | libopenshot-audio 0.2.0
juce::MemoryOutputStream Class Reference

Writes data to an internal memory buffer, which grows as required. More...

#include <juce_MemoryOutputStream.h>

+ Inheritance diagram for juce::MemoryOutputStream:

Public Member Functions

 MemoryOutputStream (size_t initialSize=256)
 Creates an empty memory stream, ready to be written into.
 
 MemoryOutputStream (MemoryBlock &memoryBlockToWriteTo, bool appendToExistingBlockContent)
 Creates a memory stream for writing into into a pre-existing MemoryBlock object.
 
 MemoryOutputStream (void *destBuffer, size_t destBufferSize)
 Creates a MemoryOutputStream that will write into a user-supplied, fixed-size block of memory.
 
 ~MemoryOutputStream () override
 Destructor.
 
const voidgetData () const noexcept
 Returns a pointer to the data that has been written to the stream.
 
size_t getDataSize () const noexcept
 Returns the number of bytes of data that have been written to the stream.
 
void reset () noexcept
 Resets the stream, clearing any data that has been written to it so far.
 
void preallocate (size_t bytesToPreallocate)
 Increases the internal storage capacity to be able to contain at least the specified amount of data without needing to be resized.
 
bool appendUTF8Char (juce_wchar character)
 Appends the utf-8 bytes for a unicode character.
 
String toUTF8 () const
 Returns a String created from the (UTF8) data that has been written to the stream.
 
String toString () const
 Attempts to detect the encoding of the data and convert it to a string.
 
MemoryBlock getMemoryBlock () const
 Returns a copy of the stream's data as a memory block.
 
void flush () override
 If the stream is writing to a user-supplied MemoryBlock, this will trim any excess capacity off the block, so that its length matches the amount of actual data that has been written so far.
 
bool write (const void *, size_t) override
 Writes a block of data to the stream.
 
int64 getPosition () override
 Returns the stream's current position.
 
bool setPosition (int64) override
 Tries to move the stream's output position.
 
int64 writeFromInputStream (InputStream &, int64 maxNumBytesToWrite) override
 Reads data from an input stream and writes it to this stream.
 
bool writeRepeatedByte (uint8 byte, size_t numTimesToRepeat) override
 Writes a byte to the output stream a given number of times.
 
- Public Member Functions inherited from juce::OutputStream
virtual ~OutputStream ()
 Destructor.
 
virtual bool writeByte (char byte)
 Writes a single byte to the stream.
 
virtual bool writeBool (bool boolValue)
 Writes a boolean to the stream as a single byte.
 
virtual bool writeShort (short value)
 Writes a 16-bit integer to the stream in a little-endian byte order.
 
virtual bool writeShortBigEndian (short value)
 Writes a 16-bit integer to the stream in a big-endian byte order.
 
virtual bool writeInt (int value)
 Writes a 32-bit integer to the stream in a little-endian byte order.
 
virtual bool writeIntBigEndian (int value)
 Writes a 32-bit integer to the stream in a big-endian byte order.
 
virtual bool writeInt64 (int64 value)
 Writes a 64-bit integer to the stream in a little-endian byte order.
 
virtual bool writeInt64BigEndian (int64 value)
 Writes a 64-bit integer to the stream in a big-endian byte order.
 
virtual bool writeFloat (float value)
 Writes a 32-bit floating point value to the stream in a binary format.
 
virtual bool writeFloatBigEndian (float value)
 Writes a 32-bit floating point value to the stream in a binary format.
 
virtual bool writeDouble (double value)
 Writes a 64-bit floating point value to the stream in a binary format.
 
virtual bool writeDoubleBigEndian (double value)
 Writes a 64-bit floating point value to the stream in a binary format.
 
virtual bool writeCompressedInt (int value)
 Writes a condensed binary encoding of a 32-bit integer.
 
virtual bool writeString (const String &text)
 Stores a string in the stream in a binary format.
 
virtual bool writeText (const String &text, bool asUTF16, bool writeUTF16ByteOrderMark, const char *lineEndings)
 Writes a string of text to the stream.
 
void setNewLineString (const String &newLineString)
 Sets the string to write to the stream when a new line is written.
 
const StringgetNewLineString () const noexcept
 Returns the current new-line string that was set by setNewLineString().
 

Detailed Description

Writes data to an internal memory buffer, which grows as required.

The data that was written into the stream can then be accessed later as a contiguous block of memory.

Definition at line 39 of file juce_MemoryOutputStream.h.

Constructor & Destructor Documentation

◆ MemoryOutputStream() [1/3]

juce::MemoryOutputStream::MemoryOutputStream ( size_t  initialSize = 256)

Creates an empty memory stream, ready to be written into.

Parameters
initialSizethe initial amount of capacity to allocate for writing into

Definition at line 26 of file juce_MemoryOutputStream.cpp.

References juce::MemoryBlock::setSize().

◆ MemoryOutputStream() [2/3]

juce::MemoryOutputStream::MemoryOutputStream ( MemoryBlock memoryBlockToWriteTo,
bool  appendToExistingBlockContent 
)

Creates a memory stream for writing into into a pre-existing MemoryBlock object.

Note that the destination block will always be larger than the amount of data that has been written to the stream, because the MemoryOutputStream keeps some spare capactity at its end. To trim the block's size down to fit the actual data, call flush(), or delete the MemoryOutputStream.

Parameters
memoryBlockToWriteTothe block into which new data will be written.
appendToExistingBlockContentif this is true, the contents of the block will be kept, and new data will be appended to it. If false, the block will be cleared before use

Definition at line 32 of file juce_MemoryOutputStream.cpp.

◆ MemoryOutputStream() [3/3]

juce::MemoryOutputStream::MemoryOutputStream ( void destBuffer,
size_t  destBufferSize 
)

Creates a MemoryOutputStream that will write into a user-supplied, fixed-size block of memory.

When using this mode, the stream will write directly into this memory area until it's full, at which point write operations will fail.

Definition at line 40 of file juce_MemoryOutputStream.cpp.

◆ ~MemoryOutputStream()

juce::MemoryOutputStream::~MemoryOutputStream ( )
override

Destructor.

This will free any data that was written to it.

Definition at line 46 of file juce_MemoryOutputStream.cpp.

Member Function Documentation

◆ getData()

const void * juce::MemoryOutputStream::getData ( ) const
noexcept

Returns a pointer to the data that has been written to the stream.

See also
getDataSize

Definition at line 148 of file juce_MemoryOutputStream.cpp.

References juce::MemoryBlock::getData(), and juce::MemoryBlock::getSize().

Referenced by juce::XmlDocument::getDocumentElement(), getMemoryBlock(), toString(), and toUTF8().

◆ getDataSize()

size_t juce::MemoryOutputStream::getDataSize ( ) const
inlinenoexcept

Returns the number of bytes of data that have been written to the stream.

See also
getData

Definition at line 84 of file juce_MemoryOutputStream.h.

Referenced by juce::XmlDocument::getDocumentElement(), getMemoryBlock(), toString(), and toUTF8().

◆ reset()

void juce::MemoryOutputStream::reset ( )
noexcept

Resets the stream, clearing any data that has been written to it so far.

Definition at line 68 of file juce_MemoryOutputStream.cpp.

◆ preallocate()

void juce::MemoryOutputStream::preallocate ( size_t  bytesToPreallocate)

Increases the internal storage capacity to be able to contain at least the specified amount of data without needing to be resized.

Definition at line 62 of file juce_MemoryOutputStream.cpp.

References juce::MemoryBlock::ensureSize().

Referenced by writeFromInputStream().

◆ appendUTF8Char()

bool juce::MemoryOutputStream::appendUTF8Char ( juce_wchar  character)

Appends the utf-8 bytes for a unicode character.

Definition at line 132 of file juce_MemoryOutputStream.cpp.

References juce::CharPointer_UTF8::getBytesRequiredFor(), and juce::CharPointer_UTF8::write().

◆ toUTF8()

String juce::MemoryOutputStream::toUTF8 ( ) const

Returns a String created from the (UTF8) data that has been written to the stream.

Definition at line 189 of file juce_MemoryOutputStream.cpp.

References getData(), and getDataSize().

Referenced by juce::InputStream::readNextLine(), and juce::InputStream::readString().

◆ toString()

String juce::MemoryOutputStream::toString ( ) const

Attempts to detect the encoding of the data and convert it to a string.

See also
String::createStringFromData

Definition at line 195 of file juce_MemoryOutputStream.cpp.

References juce::String::createStringFromData(), getData(), and getDataSize().

Referenced by juce::XmlDocument::getDocumentElement(), and juce::ChildProcess::readAllProcessOutput().

◆ getMemoryBlock()

MemoryBlock juce::MemoryOutputStream::getMemoryBlock ( ) const

Returns a copy of the stream's data as a memory block.

Definition at line 143 of file juce_MemoryOutputStream.cpp.

References getData(), and getDataSize().

◆ flush()

void juce::MemoryOutputStream::flush ( )
overridevirtual

If the stream is writing to a user-supplied MemoryBlock, this will trim any excess capacity off the block, so that its length matches the amount of actual data that has been written so far.

Implements juce::OutputStream.

Definition at line 51 of file juce_MemoryOutputStream.cpp.

◆ write()

bool juce::MemoryOutputStream::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.

Definition at line 102 of file juce_MemoryOutputStream.cpp.

Referenced by juce::ChildProcess::readAllProcessOutput().

◆ getPosition()

int64 juce::MemoryOutputStream::getPosition ( )
inlineoverridevirtual

Returns the stream's current position.

See also
setPosition

Implements juce::OutputStream.

Definition at line 116 of file juce_MemoryOutputStream.h.

◆ setPosition()

bool juce::MemoryOutputStream::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.

Definition at line 159 of file juce_MemoryOutputStream.cpp.

◆ writeFromInputStream()

int64 juce::MemoryOutputStream::writeFromInputStream ( InputStream source,
int64  maxNumBytesToWrite 
)
overridevirtual

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 from juce::OutputStream.

Definition at line 172 of file juce_MemoryOutputStream.cpp.

References juce::InputStream::getPosition(), juce::MemoryBlock::getSize(), juce::InputStream::getTotalLength(), preallocate(), and juce::OutputStream::writeFromInputStream().

Referenced by juce::XmlDocument::getDocumentElement().

◆ writeRepeatedByte()

bool juce::MemoryOutputStream::writeRepeatedByte ( uint8  byte,
size_t  numTimesToRepeat 
)
overridevirtual

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

Returns
false if the write operation fails for some reason

Reimplemented from juce::OutputStream.

Definition at line 118 of file juce_MemoryOutputStream.cpp.


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