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<?php
/*
* $Id: FileReader.php,v 1.9 2005/05/26 13:10:52 mrook 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/PhingFile.php';
include_once 'phing/system/io/Reader.php';
/**
* Convenience class for reading files. The constructor of this
* @package phing.system.io
*/
class FileReader extends Reader {
protected $file;
protected $fd;
protected $currentPosition = 0;
protected $mark = 0;
function __construct($file, $exclusive = false) {
if ($file instanceof PhingFile) {
$this->file = $file;
} elseif (is_string($file)) {
$this->file = new PhingFile($file);
} else {
throw new Exception("Illegal argument type to " . __METHOD__);
}
}
function skip($n) {
$this->open();
$start = $this->currentPosition;
$ret = @fseek($this->fd, $n, SEEK_CUR);
if ( $ret === -1 )
return -1;
$this->currentPosition = ftell($this->fd);
if ( $start > $this->currentPosition )
$skipped = $start - $this->currentPosition;
else
$skipped = $this->currentPosition - $start;
return $skipped;
}
/**
* Read data from file.
* @param int $len Num chars to read.
* @return string chars read or -1 if eof.
*/
function read($len = null) {
$this->open();
if (feof($this->fd)) {
return -1;
}
// Compute length to read
// possible that filesize($this->file) will be larger than
// available bytes to read, but that's fine -- better to err on high end
$length = ($len === null) ? filesize($this->file->getAbsolutePath()) : $len;
// Read data
$out = fread($this->fd, $length + 1); // adding 1 seems to ensure that next call to read() will return EOF (-1)
$this->currentPosition = ftell($this->fd);
return $out;
}
function mark($n = null) {
$this->mark = $this->currentPosition;
}
function reset() {
// goes back to last mark, by default this would be 0 (i.e. rewind file).
fseek($this->fd, SEEK_SET, $this->mark);
$this->mark = 0;
}
function close() {
if ($this->fd === null) {
return true;
}
if (false === @fclose($this->fd)) {
// FAILED.
$msg = "Cannot fclose " . $this->file->__toString() . " $php_errormsg";
throw new IOException($msg);
} else {
$this->fd = null;
return true;
}
}
function open() {
global $php_errormsg;
if ($this->fd === null) {
$this->fd = @fopen($this->file->getAbsolutePath(), "rb");
}
if ($this->fd === false) {
// fopen FAILED.
// Add error from php to end of log message. $php_errormsg.
$msg = "Cannot fopen ".$this->file->getAbsolutePath().". $php_errormsg";
throw new IOException($msg);
}
if (false) {
// Locks don't seem to work on windows??? HELP!!!!!!!!!
// if (FALSE === @flock($fp, LOCK_EX)) { // FAILED.
$msg = "Cannot acquire flock on $file. $php_errormsg";
throw new IOException($msg);
}
return true;
}
/**
* Whether eof has been reached with stream.
* @return boolean
*/
function eof() {
return feof($this->fd);
}
/**
* Reads a entire file and stores the data in the variable
* passed by reference.
*
* @param string $file String. Path and/or name of file to read.
* @param object &$rBuffer Reference. Variable of where to put contents.
*
* @return TRUE on success. Err object on failure.
* @author Charlie Killian, charlie@tizac.com
*/
function readInto(&$rBuffer) {
$this->open();
$fileSize = $this->file->length();
if ($fileSize === false) {
$msg = "Cannot get filesize of " . $this->file->__toString() . " $php_errormsg";
throw new IOException($msg);
}
$rBuffer = fread($this->fd, $fileSize);
$this->close();
}
/**
* Returns path to file we are reading.
* @return string
*/
function getResource() {
return $this->file->toString();
}
}
?>
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