The EventBuffer class

Introduction

EventBuffer represents Libevent's "evbuffer", an utility functionality for buffered I/O.

Event buffers are meant to be generally useful for doing the "buffer" part of buffered network I/O.

Class synopsis

EventBuffer

class EventBuffer {

/* Constants */

const int EventBuffer::EOL_ANY = 0;

const int EventBuffer::EOL_CRLF = 1;

const int EventBuffer::EOL_CRLF_STRICT = 2;

const int EventBuffer::EOL_LF = 3;

const int EventBuffer::PTR_SET = 0;

const int EventBuffer::PTR_ADD = 1;

/* Properties */

public readonly int $length;

public readonly int $contiguous_space;

/* Methods */

public bool add( string $data )

public bool addBuffer( EventBuffer $buf )

public int appendFrom( EventBuffer $buf , int $len )

public __construct()

public int copyout( string &$data , int $max_bytes )

public bool drain( int $len )

public void enableLocking()

public bool expand( int $len )

public bool freeze( bool $at_front )

public void lock()

public bool prepend( string $data )

public bool prependBuffer( EventBuffer $buf )

public string pullup( int $size )

public string read( int $max_bytes )

public int read( mixed $fd , int $howmuch )

public string readLine( int $eol_style )

public mixed search( string $what , int $start = -1 , int $end = -1 )

public mixed searchEol( int $start = -1 , int $eol_style = EventBuffer::EOL_ANY )

public string substr( int $start , int $length = ?)

public bool unfreeze( bool $at_front )

public bool unlock()

public int write( mixed $fd , int $howmuch = ?)

}

Properties

length: The number of bytes stored in an event buffer.
contiguous_space: The number of bytes stored contiguously at the front of the buffer. The bytes in a buffer may be stored in multiple separate chunks of memory; the property returns the number of bytes currently stored in the first chunk.

Predefined Constants

EventBuffer::EOL_ANY: The end of line is any sequence of any number of carriage return and linefeed characters. This format is not very useful; it exists mainly for backward compatibility.
EventBuffer::EOL_CRLF: The end of the line is an optional carriage return, followed by a linefeed. (In other words, it is either a "\r\n" or a "\n" .) This format is useful in parsing text-based Internet protocols, since the standards generally prescribe a "\r\n" line-terminator, but nonconformant clients sometimes say just "\n" .
EventBuffer::EOL_CRLF_STRICT: The end of a line is a single carriage return, followed by a single linefeed. (This is also known as "\r\n" . The ASCII values are 0x0D 0x0A ).
EventBuffer::EOL_LF: The end of a line is a single linefeed character. (This is also known as "\n" . It is ASCII value is 0x0A .)
EventBuffer::PTR_SET: Flag used as argument of EventBuffer::setPosition method. If this flag specified, the position pointer is moved to an absolute position within the buffer.
EventBuffer::PTR_ADD: The same as EventBuffer::PTR_SET , except this flag causes EventBuffer::setPosition method to move position forward up to the specified number of bytes(instead of setting absolute position).

Table of Contents

EventBuffer::add — Append data to the end of an event buffer
EventBuffer::addBuffer — Move all data from a buffer provided to the current instance of EventBuffer
EventBuffer::appendFrom — Moves the specified number of bytes from a source buffer to the end of the current buffer
EventBuffer::__construct — Constructs EventBuffer object
EventBuffer::copyout — Copies out specified number of bytes from the front of the buffer
EventBuffer::drain — Removes specified number of bytes from the front of the buffer without copying it anywhere
EventBuffer::enableLocking — Description
EventBuffer::expand — Reserves space in buffer
EventBuffer::freeze — Prevent calls that modify an event buffer from succeeding
EventBuffer::lock — Acquires a lock on buffer
EventBuffer::prepend — Prepend data to the front of the buffer
EventBuffer::prependBuffer — Moves all data from source buffer to the front of current buffer
EventBuffer::pullup — Linearizes data within buffer and returns it's contents as a string
EventBuffer::read — Read data from an evbuffer and drain the bytes read
EventBuffer::readFrom — Read data from a file onto the end of the buffer
EventBuffer::readLine — Extracts a line from the front of the buffer
EventBuffer::search — Scans the buffer for an occurrence of a string
EventBuffer::searchEol — Scans the buffer for an occurrence of an end of line
EventBuffer::substr — Substracts a portion of the buffer data
EventBuffer::unfreeze — Re-enable calls that modify an event buffer
EventBuffer::unlock — Releases lock acquired by EventBuffer::lock
EventBuffer::write — Write contents of the buffer to a file or socket