The EventBuffer class

(PECL event >= 1.5.0)

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

class EventBuffer {
/* Constants */
const int EOL_ANY = 0;
const int EOL_CRLF = 1;
const int EOL_CRLF_STRICT = 2;
const int EOL_LF = 3;
const int PTR_SET = 0;
const int PTR_ADD = 1;
/* Properties */
public readonly int $length;
public readonly int $contiguous_space;
/* Methods */
public add( string $data ): bool
public addBuffer( EventBuffer $buf ): bool
public appendFrom( EventBuffer $buf , int $len ): int
public __construct()
public copyout( string &$data , int $max_bytes ): int
public drain( int $len ): bool
public enableLocking(): void
public expand( int $len ): bool
public freeze( bool $at_front ): bool
public lock(): void
public prepend( string $data ): bool
public prependBuffer( EventBuffer $buf ): bool
public pullup( int $size ): string
public read( int $max_bytes ): string
public read( mixed $fd , int $howmuch ): int
public readLine( int $eol_style ): string
public search( string $what , int $start = -1 , int $end = -1 ): mixed
public searchEol( int $start = -1 , int $eol_style = EventBuffer::EOL_ANY ): mixed
public substr( int $start , int $length = ?): string
public unfreeze( bool $at_front ): bool
public unlock(): bool
public write( mixed $fd , int $howmuch = ?): int
}

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).

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