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juce::InputStream Class Referenceabstract

#include <juce_InputStream.h>

Inheritance diagram for juce::InputStream:
juce::BufferedInputStream juce::FileInputStream juce::GZIPDecompressorInputStream juce::MemoryInputStream juce::SubregionStream juce::WebInputStream

Public Member Functions

virtual ~InputStream ()=default
 
virtual int64 getTotalLength ()=0
 
int64 getNumBytesRemaining ()
 
virtual bool isExhausted ()=0
 
virtual int read (void *destBuffer, int maxBytesToRead)=0
 
ssize_t read (void *destBuffer, size_t maxBytesToRead)
 
virtual char readByte ()
 
virtual bool readBool ()
 
virtual short readShort ()
 
virtual short readShortBigEndian ()
 
virtual int readInt ()
 
virtual int readIntBigEndian ()
 
virtual int64 readInt64 ()
 
virtual int64 readInt64BigEndian ()
 
virtual float readFloat ()
 
virtual float readFloatBigEndian ()
 
virtual double readDouble ()
 
virtual double readDoubleBigEndian ()
 
virtual int readCompressedInt ()
 
virtual String readNextLine ()
 
virtual String readString ()
 
virtual String readEntireStreamAsString ()
 
virtual size_t readIntoMemoryBlock (MemoryBlock &destBlock, ssize_t maxNumBytesToRead=-1)
 
virtual int64 getPosition ()=0
 
virtual bool setPosition (int64 newPosition)=0
 
virtual void skipNextBytes (int64 numBytesToSkip)
 

Detailed Description

The base class for streams that read data.

Input and output streams are used throughout the library - subclasses can override some or all of the virtual functions to implement their behaviour.

See also
OutputStream, MemoryInputStream, BufferedInputStream, FileInputStream

Definition at line 36 of file juce_InputStream.h.

Constructor & Destructor Documentation

◆ ~InputStream()

virtual juce::InputStream::~InputStream ( )
virtualdefault

Destructor.

Member Function Documentation

◆ getNumBytesRemaining()

int64 juce::InputStream::getNumBytesRemaining ( )

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

See also
getTotalLength

Definition at line 26 of file juce_InputStream.cpp.

◆ getPosition()

virtual int64 juce::InputStream::getPosition ( )
pure virtual

◆ getTotalLength()

virtual int64 juce::InputStream::getTotalLength ( )
pure virtual

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

Implemented in juce::FileInputStream, juce::WebInputStream, juce::BufferedInputStream, juce::MemoryInputStream, juce::SubregionStream, and juce::GZIPDecompressorInputStream.

Referenced by getNumBytesRemaining(), and juce::MemoryOutputStream::writeFromInputStream().

◆ isExhausted()

virtual bool juce::InputStream::isExhausted ( )
pure virtual

◆ read() [1/2]

virtual int juce::InputStream::read ( void destBuffer,
int  maxBytesToRead 
)
pure virtual

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

Implemented in juce::FileInputStream, juce::WebInputStream, juce::BufferedInputStream, juce::MemoryInputStream, juce::SubregionStream, and juce::GZIPDecompressorInputStream.

Referenced by readByte(), readCompressedInt(), juce::var::readFromStream(), readInt(), readInt64(), readInt64BigEndian(), readIntBigEndian(), readShort(), readShortBigEndian(), skipNextBytes(), and juce::OutputStream::writeFromInputStream().

◆ read() [2/2]

ssize_t juce::InputStream::read ( void destBuffer,
size_t  maxBytesToRead 
)

Definition at line 36 of file juce_InputStream.cpp.

◆ readBool()

bool juce::InputStream::readBool ( )
virtual

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

Definition at line 63 of file juce_InputStream.cpp.

◆ readByte()

char juce::InputStream::readByte ( )
virtual

Reads a byte from the stream. If the stream is exhausted, this will return zero.

See also
OutputStream::writeByte

Definition at line 56 of file juce_InputStream.cpp.

Referenced by juce::ValueTreeSynchroniser::applyChange(), readBool(), readCompressedInt(), juce::var::readFromStream(), readNextLine(), and readString().

◆ readCompressedInt()

int juce::InputStream::readCompressedInt ( )
virtual

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()

Definition at line 108 of file juce_InputStream.cpp.

Referenced by juce::ValueTreeSynchroniser::applyChange(), juce::var::readFromStream(), and juce::ValueTree::readFromStream().

◆ readDouble()

double juce::InputStream::readDouble ( )
virtual

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

Definition at line 168 of file juce_InputStream.cpp.

Referenced by juce::var::readFromStream().

◆ readDoubleBigEndian()

double juce::InputStream::readDoubleBigEndian ( )
virtual

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

Definition at line 175 of file juce_InputStream.cpp.

◆ readEntireStreamAsString()

String juce::InputStream::readEntireStreamAsString ( )
virtual

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.

Definition at line 229 of file juce_InputStream.cpp.

Referenced by juce::JSON::parse().

◆ readFloat()

float juce::InputStream::readFloat ( )
virtual

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

Definition at line 153 of file juce_InputStream.cpp.

◆ readFloatBigEndian()

float juce::InputStream::readFloatBigEndian ( )
virtual

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

Definition at line 161 of file juce_InputStream.cpp.

◆ readInt()

int juce::InputStream::readInt ( )
virtual

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

Definition at line 88 of file juce_InputStream.cpp.

Referenced by readFloat(), and juce::var::readFromStream().

◆ readInt64()

int64 juce::InputStream::readInt64 ( )
virtual

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

Definition at line 133 of file juce_InputStream.cpp.

Referenced by readDouble(), and juce::var::readFromStream().

◆ readInt64BigEndian()

int64 juce::InputStream::readInt64BigEndian ( )
virtual

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

Definition at line 143 of file juce_InputStream.cpp.

Referenced by readDoubleBigEndian().

◆ readIntBigEndian()

int juce::InputStream::readIntBigEndian ( )
virtual

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

Definition at line 98 of file juce_InputStream.cpp.

Referenced by readFloatBigEndian().

◆ readIntoMemoryBlock()

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

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

Parameters
destBlockthe block to append the data onto
maxNumBytesToReadif 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

Definition at line 223 of file juce_InputStream.cpp.

Referenced by juce::MidiFile::readFrom().

◆ readNextLine()

String juce::InputStream::readNextLine ( )
virtual

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.

Definition at line 196 of file juce_InputStream.cpp.

◆ readShort()

short juce::InputStream::readShort ( )
virtual

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

Definition at line 68 of file juce_InputStream.cpp.

◆ readShortBigEndian()

short juce::InputStream::readShortBigEndian ( )
virtual

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

Definition at line 78 of file juce_InputStream.cpp.

◆ readString()

String juce::InputStream::readString ( )
virtual

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 juce::BufferedInputStream.

Definition at line 182 of file juce_InputStream.cpp.

Referenced by juce::ValueTreeSynchroniser::applyChange(), juce::ValueTree::readFromStream(), and juce::BufferedInputStream::readString().

◆ setPosition()

virtual bool juce::InputStream::setPosition ( int64  newPosition)
pure virtual

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

Implemented in juce::BufferedInputStream, juce::SubregionStream, juce::GZIPDecompressorInputStream, juce::WebInputStream, juce::FileInputStream, and juce::MemoryInputStream.

Referenced by readNextLine().

◆ skipNextBytes()

void juce::InputStream::skipNextBytes ( int64  numBytesToSkip)
virtual

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 in juce::MemoryInputStream.

Definition at line 237 of file juce_InputStream.cpp.

Referenced by juce::var::readFromStream(), and juce::GZIPDecompressorInputStream::setPosition().


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