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MemoryInputStream Class Reference

Allows a block of data to be accessed as a stream. More...

#include <juce_MemoryInputStream.h>

Inheritance diagram for MemoryInputStream:

Public Member Functions

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

Additional Inherited Members

- Protected Member Functions inherited from InputStream
 InputStream ()=default
 

Detailed Description

Allows a block of data to be accessed as a stream.

This can either be used to refer to a shared block of memory, or can make its own internal copy of the data when the MemoryInputStream is created.

Constructor & Destructor Documentation

◆ MemoryInputStream() [1/3]

MemoryInputStream::MemoryInputStream ( const void * sourceData,
size_t sourceDataSize,
bool keepInternalCopyOfData )

Creates a MemoryInputStream.

Parameters
sourceDatathe block of data to use as the stream's source
sourceDataSizethe number of bytes in the source data block
keepInternalCopyOfDataif false, the stream will just keep a pointer to the source data, so this data shouldn't be changed for the lifetime of the stream; if this parameter is true, the stream will make its own copy of the data and use that.

◆ MemoryInputStream() [2/3]

MemoryInputStream::MemoryInputStream ( const MemoryBlock & data,
bool keepInternalCopyOfData )

Creates a MemoryInputStream.

Parameters
dataa block of data to use as the stream's source
keepInternalCopyOfDataif false, the stream will just keep a reference to the source data, so this data shouldn't be changed for the lifetime of the stream; if this parameter is true, the stream will make its own copy of the data and use that.

◆ MemoryInputStream() [3/3]

MemoryInputStream::MemoryInputStream ( MemoryBlock && blockToTake)

Creates a stream by moving from a MemoryBlock.

◆ ~MemoryInputStream()

MemoryInputStream::~MemoryInputStream ( )
override

Destructor.

Member Function Documentation

◆ getData()

const void * MemoryInputStream::getData ( ) const
noexcept

Returns a pointer to the source data block from which this stream is reading.

◆ getDataSize()

size_t MemoryInputStream::getDataSize ( ) const
noexcept

Returns the number of bytes of source data in the block from which this stream is reading.

◆ getPosition()

int64 MemoryInputStream::getPosition ( )
overridevirtual

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

See also
setPosition

Implements InputStream.

◆ setPosition()

bool MemoryInputStream::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.

◆ getTotalLength()

int64 MemoryInputStream::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 MemoryInputStream::isExhausted ( )
overridevirtual

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

Implements InputStream.

◆ read()

int MemoryInputStream::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
destBufferthe destination buffer for the data. This must not be null.
maxBytesToReadthe 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.

◆ skipNextBytes()

void MemoryInputStream::skipNextBytes ( int64 numBytesToSkip)
overridevirtual

Reads and discards a number of bytes from the stream.

Some input streams might implement this more efficiently, but the base class will just keep reading data until the requisite number of bytes have been done. For large skips it may be quicker to call setPosition() with the required position.

Reimplemented from InputStream.


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