/// <summary>
/// Hides message into .avi file
/// </summary>
/// <param name="avifh">.avi file handler</param>
/// <param name="message">String to hide</param>
/// <param name="force">Hide into compressed streams</param>
/// <param name="hideTo">List of streams the message will be hidden into (in given order)</param>
/// <returns>True if message was hide successfuly else false</returns>
public static bool HideMessage(AVIFileHandler avifh, string message, bool force, IEnumerable <Options.DataTypes> hideTo)
{
message += MESSAGE_END;
if (!CheckAvailableSpace(avifh, message, hideTo))
{
IOUtils.ConsolePrintFailure();
Console.WriteLine("There is not enough space for message");
return(false);
}
else
{
IOUtils.ConsolePrintSuccess();
Console.WriteLine("Space check.");
}
foreach (Options.DataTypes type in hideTo)
{
Dictionary <Int32, CHUNK> chunks;
if (CheckCompression(avifh.IsStreamUncompressed(type), force, type))
{
if (avifh.Chunks.TryGetValue(AVIFileHandler.GetChunkName(type), out chunks))
{
foreach (KeyValuePair <Int32, CHUNK> kvp in chunks)
{
message = HideData(avifh.Avi, kvp.Key, kvp.Value.ckSize, message);
if (message == String.Empty)
{
return(true);
}
}
}
}
}
return(false);
}
/// <summary>
/// Extracts hidden message from .avi file
/// </summary>
/// <param name="avifh">.avi file handler</param>
/// <param name="extractFrom">List of streams the message will be extracted from (in given order)</param>
/// <returns>Extracted message</returns>
public static string ExtractMessage(AVIFileHandler avifh, IEnumerable <Options.DataTypes> extractFrom)
{
string message = "";
bool EndReached = false;
foreach (Options.DataTypes type in extractFrom)
{
Dictionary <Int32, CHUNK> chunks;
if (avifh.Chunks.TryGetValue(AVIFileHandler.GetChunkName(type), out chunks))
{
foreach (KeyValuePair <Int32, CHUNK> kvp in chunks)
{
EndReached = ExtractData(avifh.Avi, kvp.Key, kvp.Value.ckSize, ref message);
if (EndReached)
{
return(message);
}
}
}
}
return(null);
}
