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<?php
/*
* $Id: BufferedReader.php,v 1.6 2005/12/27 19:12:13 hlellelid Exp $
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information please see
* <http://phing.info>.
*/
include_once 'phing/system/io/Reader.php';
/*
* Convenience class for reading files.
*
* @author <a href="mailto:yl@seasonfive.com">Yannick Lecaillez</a>
* @version $Revision: 1.6 $ $Date: 2005/12/27 19:12:13 $
* @access public
* @see FilterReader
* @package phing.system.io
*/
class BufferedReader extends Reader {
private $bufferSize = 0;
private $buffer = null;
private $bufferPos = 0;
/**
* The Reader we are buffering for.
*/
private $in;
/**
*
* @param object $reader The reader (e.g. FileReader).
* @param integer $buffsize The size of the buffer we should use for reading files.
* A large buffer ensures that most files (all scripts?) are parsed in 1 buffer.
*/
function __construct(Reader $reader, $buffsize = 65536) {
$this->in = $reader;
$this->bufferSize = $buffsize;
}
/**
* Reads and returns $_bufferSize chunk of data.
* @return mixed buffer or -1 if EOF.
*/
function read($len = null) {
// ignore $len param, not sure how to hanlde it, since
// this should only read bufferSize amount of data.
if ($len !== null) {
$this->currentPosition = ftell($this->fd);
}
if ( ($data = $this->in->read($this->bufferSize)) !== -1 ) {
// not all files end with a newline character, so we also need to check EOF
if (!$this->in->eof()) {
$notValidPart = strrchr($data, "\n");
$notValidPartSize = strlen($notValidPart);
if ( $notValidPartSize > 1 ) {
// Block doesn't finish on a EOL
// Find the last EOL and forgot all following stuff
$dataSize = strlen($data);
$validSize = $dataSize - $notValidPartSize + 1;
$data = substr($data, 0, $validSize);
// Rewind to the begining of the forgotten stuff.
$this->in->skip(-$notValidPartSize+1);
}
} // if !EOF
}
return $data;
}
function skip($n) {
return $this->in->skip($n);
}
function reset() {
return $this->in->reset();
}
function close() {
return $this->in->close();
}
function open() {
return $this->in->open();
}
/**
* Read a line from input stream.
*/
function readLine() {
$line = null;
while ( ($ch = $this->readChar()) !== -1 ) {
if ( $ch === "\n" ) {
break;
}
$line .= $ch;
}
// Warning : Not considering an empty line as an EOF
if ( $line === null && $ch !== -1 )
return "";
return $line;
}
/**
* Reads a single char from the reader.
* @return string single char or -1 if EOF.
*/
function readChar() {
if ( $this->buffer === null ) {
// Buffer is empty, fill it ...
$read = $this->in->read($this->bufferSize);
if ($read === -1) {
$ch = -1;
} else {
$this->buffer = $read;
return $this->readChar(); // recurse
}
} else {
// Get next buffered char ...
// handle case where buffer is read-in, but is empty. The next readChar() will return -1 EOF,
// so we just return empty string (char) at this point. (Probably could also return -1 ...?)
$ch = ($this->buffer !== "") ? $this->buffer{$this->bufferPos} : '';
$this->bufferPos++;
if ( $this->bufferPos >= strlen($this->buffer) ) {
$this->buffer = null;
$this->bufferPos = 0;
}
}
return $ch;
}
/**
* Returns whether eof has been reached in stream.
* This is important, because filters may want to know if the end of the file (and not just buffer)
* has been reached.
* @return boolean
*/
function eof() {
return $this->in->eof();
}
function getResource() {
return $this->in->getResource();
}
}
?>
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