137 lines
3.6 KiB
PHP
137 lines
3.6 KiB
PHP
<?php
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/**
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* Buffer class for a string.
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* Will fix issues with sockets that don't care about linebreaks.
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* Can also be used for all kinds of purpose.
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* @author jpt
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* @package Misc
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*/
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class Misc_Buffer {
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/**
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* Bufferstring - contains all the data.
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* @var string
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*/
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protected $buffer;
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/**
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* Linebreak to use for pulling lines out of the buffer.
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* @var string
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*/
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protected $linebreak;
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/**
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* Default constructor. Sets a default linebreak and initializes the buffer.
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* @param $linebreak
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* @return void
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*/
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public function __construct($linebreak = "") {
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$this->buffer = "";
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$this->linebreak = $linebreak;
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}
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/**
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* Prunes empty lines out of the buffer.
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* @return void
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*/
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protected function pruneEmptyLines() {
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//no need to do this when there are no linebreaks.
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if($this->linebreak === "") return;
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if(strpos($this->buffer, $this->linebreak) === FALSE) return;
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$hasLinebreakAtEnd = (substr($this->buffer, (-1) * strlen($this->linebreak)) === $this->linebreak) ? TRUE : FALSE;
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$lines = explode($this->linebreak, $this->buffer);
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foreach($lines AS $key=>$line) {
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$line = str_replace($this->linebreak, "", $line);
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$line = trim($line);
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if($line === "") unset($lines[$key]);
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}
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$this->buffer = implode($this->linebreak, $lines);
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if($hasLinebreakAtEnd === TRUE) $this->buffer .= $this->linebreak;
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}
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/**
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* Appends data to the buffer.
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* @param string $data
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* @return void
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*/
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public function addData($data) {
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$this->buffer .= $data;
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$this->pruneEmptyLines();
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}
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/**
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* Appends data + linebreak to the buffer.
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* @param string $data
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* @return void
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*/
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public function addLine($data) {
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$this->buffer .= $data . $this->linebreak;
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$this->pruneEmptyLines();
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}
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/**
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* Returns the next line in the buffer and removes it from the buffer.
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* @return string
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* @throws Exception_GeneralException
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*/
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public function getNextLine() {
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if($this->linebreak === "") throw new Exception_GeneralException("Cannot return a line - no linebreak is set!", 1290964174);
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if(!$this->hasLines()) return "";
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list($line) = explode($this->linebreak, $this->buffer);
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$this->buffer = str_replace($line.$this->linebreak, "", $this->buffer);
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$line = trim($line);
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$result = ($line !== "") ? $line.$this->linebreak : "";
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return $result;
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}
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/**
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* Returns the length of the buffer.
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* @return int
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*/
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public function getBufferLength() {
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return strlen($this->buffer);
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}
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/**
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* Returns the next $length chars from the buffer or throws an exception if this cannot be done.
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* @throws Exception_GeneralException
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* @return string
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*/
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public function getNextChars($length) {
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if(strlen($this->buffer) < $length) throw new Exception_GeneralException("Cannot return ".$length." chars, there are only ".strlen($this->buffer)." chars left!", 1292780386);
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$data = substr($this->buffer, 0, $length);
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$this->buffer = substr($this->buffer, $length);
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return $data;
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}
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/**
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* Checks whether the buffer contains more lines to process.
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* @return boolean
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* @throws Exception_GeneralException
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*/
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public function hasLines() {
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if($this->linebreak === "") throw new Exception_GeneralException("Cannot tell whether the buffer has lines - no linebreak set!", 1290964243);
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return (trim(strstr($this->buffer, $this->linebreak, TRUE)) !== "") ? TRUE : FALSE;
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}
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/**
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* Returns TRUE when there is data in the buffer.
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* @return boolean
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*/
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public function hasData() {
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return (strlen($this->buffer) > 0) ? TRUE : FALSE;
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}
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/**
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* Returns the full buffer contents.
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* Also truncates the buffer.
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* @return string
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*/
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public function getAllBufferContents() {
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$return = $this->buffer;
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$this->buffer = "";
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return $return;
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}
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}
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?>
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