diff options
Diffstat (limited to 'buildscripts/phing/classes/phing/system/io/BufferedReader.php')
| -rw-r--r-- | buildscripts/phing/classes/phing/system/io/BufferedReader.php | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/buildscripts/phing/classes/phing/system/io/BufferedReader.php b/buildscripts/phing/classes/phing/system/io/BufferedReader.php new file mode 100644 index 00000000..4946985c --- /dev/null +++ b/buildscripts/phing/classes/phing/system/io/BufferedReader.php @@ -0,0 +1,170 @@ +<?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(); + } +} +?> |