The EventBuffer class

Intro

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

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).

Eventbuffer