initial commit

demo/php/.htaccess

@@ -0,0 +1,10 @@
+RewriteEngine on
+
+# (as suggested by www.zeilenwechsel.de)
+
+RewriteBase /
+
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond $1#%{REQUEST_URI} ([^#]*)#(.*)\1$
+RewriteRule ^(.*)$ %2index.php/$1 [QSA,L]
+

demo/php/include/config.inc.php

@@ -0,0 +1,7 @@
+<?php
+
+$waveform = array(
+   'snddir' => dirname(__FILE__).'/../../snd',
+   'cachedir' => dirname(__FILE__).'/../../tmp'
+);
+

demo/php/include/functions.inc.php

@@ -0,0 +1,18 @@
+<?php
+
+function fatal_error($msg, $status = '505 Internal Server Error') {
+   header('Status: '.$status);
+
+   echo $msg."\n";
+
+   return 1;
+}
+
+function sanitize_path_request($path_info) {
+   return preg_replace(
+      array('|^/|', '/[^A-Za-z0-9\-\.]/'), 
+      array('', ''), 
+      $path_info
+   );
+}
+

demo/php/include/init.inc.php

@@ -0,0 +1,5 @@
+<?php
+
+require_once('config.inc.php');
+require_once('functions.inc.php');
+

demo/php/index.php

@@ -0,0 +1,32 @@
+<?php
+set_include_path(dirname(__FILE__).'/include');
+
+require_once('init.inc.php');
+
+$path = sanitize_path_request($_SERVER['PATH_INFO']);
+
+$cachefile = $waveform['cachedir'].'/'.sha1($path);
+
+$mp3file = $waveform['snddir'].'/'.$path;
+
+if(!is_file($mp3file))
+   exit(fatal_error("Error: requested file $mp3file not found"));
+
+if(!file_exists($cachefile)) {
+   $cmdline = 'waveform draw "'.$mp3file.'" "'.$cachefile.'" 0 -1';
+   $system_rv = null;
+
+   system($cmdline, $system_rv);
+
+   if($system_rv!=0) {
+      if(file_Exists($cachefile))
+         unlink($cachefile);
+
+      exit(fatal_error('Error: generating the waveform diagram failed'));
+   }
+}
+
+header('Content-type: image/jpeg');
+
+echo file_get_contents($cachefile);
+