Wordpress 2.8

[autoinstalls/wordpress.git] / wp-includes / pomo / streams.php

diff --git a/wp-includes/pomo/streams.php b/wp-includes/pomo/streams.php
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+<?php
+/**
+ * Classes, which help reading streams of data from files.
+ * Based on the classes from Danilo Segan <danilo@kvota.net>
+ *
+ * @version $Id: streams.php 33 2009-02-16 09:33:39Z nbachiyski $
+ * @package pomo
+ * @subpackage streams
+ */
+
+
+/**
+ * Provides file-like methods for manipulating a string instead
+ * of a physical file.
+ */
+class POMO_StringReader {
+  var $_pos;
+  var $_str;
+
+  function POMO_StringReader($str = '') {
+    $this->_str = $str;
+    $this->_pos = 0;
+  }
+
+  function read($bytes) {
+    $data = substr($this->_str, $this->_pos, $bytes);
+    $this->_pos += $bytes;
+    if (strlen($this->_str)<$this->_pos)
+      $this->_pos = strlen($this->_str);
+
+    return $data;
+  }
+
+  function seekto($pos) {
+    $this->_pos = $pos;
+    if (strlen($this->_str)<$this->_pos)
+      $this->_pos = strlen($this->_str);
+    return $this->_pos;
+  }
+
+  function pos() {
+    return $this->_pos;
+  }
+
+  function length() {
+    return strlen($this->_str);
+  }
+
+}
+
+/**
+ * Reads the contents of the file in the beginning.
+ */
+class POMO_CachedFileReader extends POMO_StringReader {
+       function POMO_CachedFileReader($filename) {
+               $this->_str = file_get_contents($filename);
+               if (false === $this->_str)
+                       return false;
+               $this->pos = 0;
+       }
+}
+
+/**
+ * Allows reading integers from a file.
+ */
+class POMO_CachedIntFileReader extends POMO_CachedFileReader {
+
+       var $endian = 'little';
+
+       /**
+        * Opens a file and caches it.
+        *
+        * @param $filename string name of the file to be opened
+        * @param $endian string endianness of the words in the file, allowed
+        *      values are 'little' or 'big'. Default value is 'little'
+        */
+       function POMO_CachedIntFileReader($filename, $endian = 'little') {
+               $this->endian = $endian;
+               parent::POMO_CachedFileReader($filename);
+       }
+
+       /**
+        * Sets the endianness of the file.
+        *
+        * @param $endian string 'big' or 'little'
+        */
+       function setEndian($endian) {
+               $this->endian = $endian;
+       }
+
+       /**
+        * Reads a 32bit Integer from the Stream
+        *
+        * @return mixed The integer, corresponding to the next 32 bits from
+        *      the stream of false if there are not enough bytes or on error
+        */
+       function readint32() {
+               $bytes = $this->read(4);
+               if (4 != strlen($bytes))
+                       return false;
+               $endian_letter = ('big' == $this->endian)? 'N' : 'V';
+               $int = unpack($endian_letter, $bytes);
+               return array_shift($int);
+       }
+
+       /**
+        * Reads an array of 32-bit Integers from the Stream
+        *
+        * @param integer count How many elements should be read
+        * @return mixed Array of integers or false if there isn't
+        *      enough data or on error
+        */
+       function readint32array($count) {
+               $bytes = $this->read(4 * $count);
+               if (4*$count != strlen($bytes))
+                       return false;
+               $endian_letter = ('big' == $this->endian)? 'N' : 'V';
+               return unpack($endian_letter.$count, $bytes);
+       }
+}
+
+?>