/// <summary>
/// Extracts links from the contents of a SWF document.
/// </summary>
/// <param name="content">The contents of the SWF document.</param>
/// <param name="contentUrl">The url of the SWF document.</param>
/// <returns>
/// An <see cref="ArrayList"/> of <see cref="InternetUrlToIndex"/> objects, one for
/// each link found in the content.
/// </returns>
/// <exception cref="ArgumentNullException">If the input buffer is null or empty.</exception>
public override ArrayList ExtractLinks(byte[] content, ref InternetUrlToCrawl contentUrl)
{
ArrayList links = null;
if ((content == null) || (content.Length == 0))
{
throw new ArgumentNullException("content", "The input buffer cannot be empty or null.");
}
try
{
mutex.WaitOne();
string FileName = globals.AppWorkPath + Guid.NewGuid().ToString();
string swfFileName = FileName + ".swf";
string htmFileName = FileName + ".htm";
FileStream swf = null;
StreamReader htm = null;
try
{
//store the swf file
swf = new FileStream(swfFileName, FileMode.Create);
swf.Write(content, 0, content.Length);
swf.Close();
swf = null;
//convert it to html
bool success = converter.ConvertSwfFile(swfFileName, htmFileName);
if (success)
{
htm = new StreamReader(htmFileName, encoding);
string html = htm.ReadToEnd();
htm.Close();
htm = null;
links = parser.ExtractLinks(ref html, ref contentUrl);
}
}
catch (Exception ex)
{
if (swf != null)
{
try
{
swf.Close();
}
catch
{}
}
if (htm != null)
{
try
{
htm.Close();
}
catch
{}
}
if (globals.Settings.LogLevel <= CWLogLevel.LogInfo)
{
globals.FileLog.LogInfo("SwfParser failed to extract links from " + contentUrl.Url + ": " + ex.ToString());
}
}
finally
{
File.Delete(swfFileName);
File.Delete(htmFileName);
}
}
catch (Exception ex)
{
if (globals.Settings.LogLevel <= CWLogLevel.LogWarning)
{
globals.FileLog.LogWarning("SwfParser failed to extract links from " + contentUrl.Url + ": " + ex.Message);
}
}
finally
{
GC.Collect();
mutex.ReleaseMutex();
}
ParserEventArgs e = new ParserEventArgs(contentUrl.Url);
OnExtractLinksComplete(e);
return(links);
}