Abstract byte input stream object. More...

#include <byte_stream.hpp>

Inheritance diagram for jau::io::ByteInStream:

Collaboration diagram for jau::io::ByteInStream:

Public Member Functions
	ByteInStream () noexcept

	ByteInStream (const ByteInStream &)=delete

	~ByteInStream () noexcept override=default

virtual bool	available (size_t n) noexcept=0
	Return whether n bytes are available in the input stream, if has_content_size() or using an asynchronous source. More...

virtual void	close () noexcept=0
	Close the stream if supported by the underlying mechanism. More...

virtual uint64_t	content_size () const noexcept=0
	Returns the content_size if known. More...

size_t	discard (size_t N) noexcept
	Discard the next N bytes of the data. More...

virtual bool	has_content_size () const noexcept=0
	Returns true if implementation is aware of content_size(), otherwise false. More...

virtual std::string	id () const noexcept
	return the id of this data source More...

virtual bool	is_open () const noexcept=0
	Checks if the stream has an associated file. More...

ByteInStream &	operator= (const ByteInStream &)=delete

bool	peek (uint8_t &out) noexcept
	Peek at one byte. More...

virtual size_t	peek (void *out, size_t length, size_t peek_offset) noexcept=0
	Read from the source but do not modify the internal offset. More...

bool	read (uint8_t &out) noexcept
	Read one byte. More...

virtual size_t	read (void *out, size_t length) noexcept=0
	Read from the source. More...

virtual uint64_t	tellg () const noexcept=0
	Returns the input position indicator, similar to std::basic_istream. More...

virtual std::string	to_string () const noexcept=0

Public Member Functions inherited from jau::io::iostate_func
	iostate_func () noexcept

	iostate_func (const iostate_func &o) noexcept=default

	iostate_func (iostate_func &&o) noexcept=default

virtual	~iostate_func () noexcept=default

bool	bad () const noexcept
	Checks if a non-recoverable error has occurred. More...

virtual void	clear (const iostate state=iostate::goodbit) noexcept
	Clears state flags by assignment to the given value. More...

bool	eof () const noexcept
	Checks if end-of-file has been reached. More...

bool	fail () const noexcept
	Checks if an error has occurred. More...

bool	good () const noexcept
	Checks if no error nor eof() has occurred i.e. More...

	operator bool () const noexcept
	Checks if no error has occurred, synonym of !fail(). More...

bool	operator! () const noexcept
	Checks if an error has occurred, synonym of fail(). More...

iostate_func &	operator= (const iostate_func &o) noexcept=default

iostate_func &	operator= (iostate_func &&o) noexcept=default

virtual iostate	rdstate () const noexcept
	Returns the current state flags. More...

void	setstate (const iostate state) noexcept
	Sets state flags, by keeping its previous bits. More...

bool	timeout () const noexcept
	Checks if a timeout (non-recoverable) has occurred. More...

Additional Inherited Members
Protected Member Functions inherited from jau::io::iostate_func
constexpr iostate	rdstate_impl () const noexcept

constexpr void	setstate_impl (iostate state) const noexcept

Detailed Description

Abstract byte input stream object.

ByteInStream Properties

The byte input stream can originate from a local source w/o delay, remote URL like http connection or even from another thread feeding the input buffer.
Both latter asynchronous resources may expose blocking properties in available().

Asynchronous resources benefit from knowing their content size, as their available() implementation may avoid blocking and waiting for requested bytes available if the stream is already beyond its scope.

All method implementations are of noexcept.

One may use fail() to detect whether an error has occurred, while end_of_data() not only covers the end-of-stream (EOS) case but includes fail().

See also: ByteInStream Properties

Definition at line 195 of file byte_stream.hpp.

Constructor & Destructor Documentation

◆ ByteInStream() [1/2]

jau::io::ByteInStream::ByteInStream ( )

inlinenoexcept

Definition at line 198 of file byte_stream.hpp.

◆ ~ByteInStream()

jau::io::ByteInStream::~ByteInStream ( )

overridedefaultnoexcept

◆ ByteInStream() [2/2]

jau::io::ByteInStream::ByteInStream ( const ByteInStream & )

delete

Member Function Documentation

◆ operator=()

ByteInStream & jau::io::ByteInStream::operator= ( const ByteInStream & )

delete

◆ is_open()

virtual bool jau::io::ByteInStream::is_open ( ) const

pure virtualnoexcept

Checks if the stream has an associated file.

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

◆ close()

virtual void jau::io::ByteInStream::close ( )

pure virtualnoexcept

Close the stream if supported by the underlying mechanism.

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

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◆ available()

virtual bool jau::io::ByteInStream::available ( size_t n )

pure virtualnoexcept

Return whether n bytes are available in the input stream, if has_content_size() or using an asynchronous source.

If !has_content_size() and not being an asynchronous source, !end_of_data() is returned.

Method may be blocking when using an asynchronous source up until the requested bytes are available.

A subsequent call to read() shall return immediately with at least the requested numbers of bytes available, if has_content_size() or using an asynchronous source.

See details of the implementing class.

Parameters

n	byte count to wait for

Returns: true if n bytes are available, otherwise false

See also: has_content_size(); read(); ByteInStream Properties

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

◆ read() [1/2]

virtual size_t jau::io::ByteInStream::read	(	void *	out,
		size_t	length
	)

pure virtualnoexcept

Read from the source.

Moves the internal offset so that every call to read will return a new portion of the source.

Use available() to try to wait for a certain amount of bytes available.

This method shall only block until min(available, length) bytes are transfered.

See details of the implementing class.

Parameters

out	the byte array to write the result to
length	the length of the byte array out

Returns: length in bytes that was actually read and put into out

See also: available(); ByteInStream Properties

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_Recorder, jau::io::ByteInStream_URL, and jau::io::ByteInStream_Feed.

◆ read() [2/2]

bool ByteInStream::read ( uint8_t & out )

noexcept

Read one byte.

Parameters

out	the byte to read to

Returns: true if one byte has been read, false otherwise

Definition at line 82 of file byte_stream.cpp.

◆ peek() [1/2]

virtual size_t jau::io::ByteInStream::peek	(	void *	out,
		size_t	length,
		size_t	peek_offset
	)

pure virtualnoexcept

Read from the source but do not modify the internal offset.

Consecutive calls to peek() will return portions of the source starting at the same position.

Parameters

out	the byte array to write the output to
length	the length of the byte array out
peek_offset	the offset into the stream to read at

Returns: length in bytes that was actually read and put into out

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

◆ peek() [2/2]

bool ByteInStream::peek ( uint8_t & out )

noexcept

Peek at one byte.

Parameters

out	an output byte

Returns: true if one byte has been peeked, false otherwise

Definition at line 86 of file byte_stream.cpp.

◆ discard()

size_t ByteInStream::discard ( size_t N )

noexcept

Discard the next N bytes of the data.

Parameters

N	the number of bytes to discard

Returns: number of bytes actually discarded

Definition at line 90 of file byte_stream.cpp.

◆ id()

virtual std::string jau::io::ByteInStream::id ( ) const

inlinevirtualnoexcept

return the id of this data source

Returns: std::string representing the id of this data source

Reimplemented in jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

Definition at line 294 of file byte_stream.hpp.

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◆ tellg()

virtual uint64_t jau::io::ByteInStream::tellg ( ) const

pure virtualnoexcept

Returns the input position indicator, similar to std::basic_istream.

Returns: number of bytes read so far.

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

◆ has_content_size()

virtual bool jau::io::ByteInStream::has_content_size ( ) const

pure virtualnoexcept

Returns true if implementation is aware of content_size(), otherwise false.

See also: content_size()

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

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◆ content_size()

virtual uint64_t jau::io::ByteInStream::content_size ( ) const

pure virtualnoexcept

Returns the content_size if known.

See also: has_content_size()

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

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◆ to_string()

virtual std::string jau::io::ByteInStream::to_string ( ) const

pure virtualnoexcept

Implemented in jau::io::ByteInStream_SecMemory, jau::io::ByteInStream_File, jau::io::ByteInStream_URL, jau::io::ByteInStream_Feed, and jau::io::ByteInStream_Recorder.

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

include/jau/byte_stream.hpp
src/byte_stream.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

ByteInStream Properties

Constructor & Destructor Documentation

◆ ByteInStream() [1/2]

◆ ~ByteInStream()

◆ ByteInStream() [2/2]

Member Function Documentation

◆ operator=()

◆ is_open()

◆ close()

◆ available()

◆ read() [1/2]

◆ read() [2/2]

◆ peek() [1/2]

◆ peek() [2/2]

◆ discard()

◆ id()

◆ tellg()

◆ has_content_size()

◆ content_size()

◆ to_string()