V.1.4.6

1 files changed, 172 insertions, 0 deletions

diff --git a/Html/includes/BDecode.php b/Html/includes/BDecode.php
new file mode 100644
index 0000000..fbf12bc
--- /dev/null
+++ b/Html/includes/BDecode.php
@@ -0,0 +1,172 @@
+<?php
+/*
+	Programming info
+
+All functions output a small array, which we'll call $return for now.
+
+$return[0] is the data expected of the function
+$return[1] is the offset over the whole bencoded data of the next
+           piece of data.
+
+numberdecode returns [0] as the integer read, and [1]-1 points to the
+symbol that was interprented as the end of the interger (either "e" or
+":"). 
+numberdecode is used for integer decodes both for i11e and 11:hello there
+so it is tolerant of the ending symbol.
+
+decodelist returns $return[0] as an integer indexed array like you would use in C
+for all the entries. $return[1]-1 is the "e" that ends the list, so [1] is the next
+useful byte.
+
+decodeDict returns $return[0] as an array of text-indexed entries. For example,
+$return[0]["announce"] = "http://www.whatever.com:6969/announce";
+$return[1]-1 again points to the "e" that ends the dictionary.
+
+decodeEntry returns [0] as an integer in the case $offset points to
+i12345e or a string if $offset points to 11:hello there style strings.
+It also calls decodeDict or decodeList if it encounters a d or an l.
+
+Known bugs:
+- The program doesn't pay attention to the string it's working on.
+  A zero-sized or truncated data block will cause string offset errors
+  before they get rejected by the decoder. This is worked around by
+  suppressing errors.
+*/
+
+// Protect our namespace using a class
+class BDecode {
+	function numberdecode($wholefile, $offset) {
+		// Funky handling of negative numbers and zero
+		$negative = false;
+		if ($wholefile[$offset] == '-') {
+			$negative = true;
+			$offset++;
+		}
+		if ($wholefile[$offset] == '0') {
+			$offset++;
+			if ($negative)
+				return array(false);
+			if ($wholefile[$offset] == ':' || $wholefile[$offset] == 'e'){
+			 
+             return array(0, ++$offset);
+			}
+				
+			return array(false);
+		}
+		$ret[0] = 0;
+		for(;;) {
+			if ($wholefile[$offset] >= '0' && $wholefile[$offset] <= '9') {
+				$ret[0] *= 10;
+				//Added 2005.02.21 - VisiGod
+	       //Changing the type of variable from integer to double to prevent a numeric overflow   
+				settype($ret[0],'double');
+				//Added 2005.02.21 - VisiGod
+				$ret[0] += ord($wholefile[$offset]) - ord('0');
+				$offset++;
+			}	else if ($wholefile[$offset] == 'e' || $wholefile[$offset] == ':') {
+				// Tolerate : or e because this is a multiuse function
+				$ret[1] = $offset+1;
+				if ($negative) {
+					if ($ret[0] == 0)
+						return array(false);
+					$ret[0] = - $ret[0];
+				}
+				return $ret;
+			} else return array(false);
+		}
+	}
+
+	function decodeEntry($wholefile, $offset=0) {
+		if ($wholefile[$offset] == 'd')
+			return $this->decodeDict($wholefile, $offset);
+		if ($wholefile[$offset] == 'l')
+			return $this->decodelist($wholefile, $offset);
+		if ($wholefile[$offset] == 'i')
+			return $this->numberdecode($wholefile, ++$offset);
+		// String value: decode number, then grab substring
+
+		$info = $this->numberdecode($wholefile, $offset);
+
+		if ($info[0] === false)
+			return array(false);
+		$ret[0] = substr($wholefile, $info[1], $info[0]);
+		$ret[1] = $info[1]+strlen($ret[0]);
+        
+        
+		return $ret;
+	}
+
+	function decodeList($wholefile, $offset) {
+		if ($wholefile[$offset] != 'l')
+			return array(false);
+		$offset++;
+		$ret = array();
+		for ($i=0;;$i++) {
+			if ($wholefile[$offset] == 'e')
+				break;
+			$value = $this->decodeEntry($wholefile, $offset);
+			if ($value[0] === false)
+				return array(false);
+			$ret[$i] = $value[0];
+			$offset = $value[1];
+		}
+		// The empty list is an empty array. Seems fine.
+		return array(0=>$ret, 1=>++$offset);
+	}
+
+	// Tries to construct an array
+	function decodeDict($wholefile, $offset=0) {
+		if ($wholefile[$offset] == 'l')
+			return $this->decodeList($wholefile, $offset);
+		if ($wholefile[$offset] != 'd')
+			return false;
+		$ret=array();
+		$offset++;
+		for (;;) {	
+			if ($wholefile[$offset] == 'e')	{
+				$offset++;
+				break;
+			}
+			$left = $this->decodeEntry($wholefile, $offset);
+			if ($left[0]===false) { 
+			     die("stop...".$left[1]);
+			 	return false; 
+			}
+			
+			$offset = $left[1];
+			if ($wholefile[$offset] == 'd') {
+				// Recurse
+				$value = $this->decodedict($wholefile, $offset);
+				if ($value[0]) {
+    				$ret[addslashes($left[0])] = $value[0];
+    				$offset= $value[1];
+				}
+				continue;
+			}
+			if ($wholefile[$offset] == 'l') {
+				$value = $this->decodeList($wholefile, $offset);
+				if (!$value[0] && is_bool($value[0]))
+					return false;
+				$ret[addslashes($left[0])] = $value[0];
+				$offset = $value[1];
+				continue;
+			}
+			$value = $this->decodeEntry($wholefile, $offset);
+			if ($value[0] === false)
+				return false;
+			$ret[addslashes($left[0])] = $value[0];
+			$offset = $value[1];
+            
+		}
+        
+		return array(0=>(empty($ret)?true:$ret), 1=>$offset);
+	}
+} // End of class declaration.
+
+// Use this function. eg:  BDecode("d8:announce44:http://www. ... e");
+function BDecode($wholefile) {
+	$decoder = new BDecode;
+	$return = $decoder->decodeEntry($wholefile);
+	return $return[0];
+}
+?>
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