A derived class of reader that reads from POSIX file descriptors. More...

Inheritance diagram for argo::fd_reader:

Public Member Functions
	fd_reader (int fd, int max_message_length, bool block_read)

Public Member Functions inherited from argo::reader
	reader (size_t max_message_length, bool block_read)

virtual int	next ()
	Get the next character from the reader. More...

virtual void	put_back (int c)
	Put back a character so that it is returned by the next call to next().

size_t	get_byte_index () const
	Get the current byte index in the input.

void	reset_byte_index ()
	Reset the byte index at the start of parsing a messege.

Protected Member Functions
virtual int	read_next_char ()

virtual bool	read_next_block ()

Protected Member Functions inherited from argo::reader
int	read_next_char_from_block ()
	When in block read mode, get the next available character.

Protected Attributes
int	m_fd
	Underlying POSIX file descriptor.

Protected Attributes inherited from argo::reader
int	m_put_back
	Character last put back. If equal to no_put_back then none was.

size_t	m_byte_index
	Total number of characters read.

size_t	m_max_message_length
	Maximum length of a message.

bool	m_block_read
	Whether to read in blocks or one byte at a time.

unsigned char	m_block [block_size]
	If we're reading blocks, the block data.

int	m_block_num_bytes
	If we're reading blocks, the number of bytes in the current block.

int	m_block_index
	If we're reading blocks, the index into the current block.

Additional Inherited Members
Static Public Attributes inherited from argo::reader
static const int	block_size = 8192
	Amount of data to read at once when in block read mode.

Static Protected Attributes inherited from argo::reader
static const int	no_put_back = 1000
	Special character value indicating that no character has been put back.

Detailed Description

A derived class of reader that reads from POSIX file descriptors.

Definition at line 33 of file fd_reader.hpp.

Constructor & Destructor Documentation

Constructor.

Parameters

fd	POSIX stream file descriptor. The instance does not take ownership of the open file and it is up to the calling code to close it when done.
max_message_length	Longest message that can be read.
block_read	Whether to read in blocks or one byte at a time.

Definition at line 35 of file fd_reader.cpp.

bool fd_reader::read_next_block ( )

protectedvirtual

Read the next block of data up to block_size bytes.

Exceptions

json_io_error if the read failed for some reason other than EOF.

Definition at line 63 of file fd_reader.cpp.

int fd_reader::read_next_char ( )

protectedvirtual

Read a character from the file descriptor using the read() system call.

Exceptions

json_io_exception Thrown in the event the read() call fails.

Definition at line 41 of file fd_reader.cpp.

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