/// <summary>
/// Creates instances from a stream.
/// </summary>
/// <param name="format">The format.</param>
/// <param name="stream">The stream.</param>
/// <param name="bufferSize">The custom buffer size to use to read from <paramref name="stream" />.</param>
/// <returns>The list of lazy loaded instances.</returns>
/// <exception cref="ArgumentException">
/// <paramref name="stream" /> is not readable.
/// </exception>
/// <exception cref="ArgumentNullException">
/// <paramref name="stream" /> is <see langword="null" />.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="bufferSize" /> is less than 1.
/// </exception>
public static IEnumerable <IWADFile> FromStream(Stream stream, WADFormat format = WADFormat.Default, int?bufferSize = null)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (stream.CanRead == false)
{
throw new ArgumentException("stream");
}
if (bufferSize < 1)
{
throw new ArgumentOutOfRangeException("bufferSize", bufferSize,
"Is less than 1!");
}
bool hasNext;
do
{
hasNext = false;
byte[] buffer;
buffer = new byte[4];
if (stream.Read(buffer, 0, buffer.Length) != buffer.Length)
{
continue;
}
var header = Encoding.ASCII.GetString(buffer).ToUpper().Trim();
IWADFile result = null;
var wadStream = new MemoryStream();
try
{
Action copyToWadStream = () =>
{
if (!bufferSize.HasValue)
{
stream.CopyTo(wadStream);
}
else
{
stream.CopyTo(wadStream, bufferSize.Value);
}
wadStream.Position = 0;
};
switch (header)
{
case "IWAD":
copyToWadStream();
result = new IWAD(format, wadStream, true);
break;
case "PWAD":
copyToWadStream();
result = new PWAD(format, wadStream, true);
break;
}
}
catch (Exception ex)
{
wadStream.Dispose();
throw ex;
}
if (result != null)
{
hasNext = true;
yield return(result);
}
}while (hasNext);
}
public void FileSignatures_TestPWADFile()
{
PWAD testFile = new PWAD(Path.Combine(resourceDir, "FileSignature_Emulation_PWADFile.wad"));
Assert.AreEqual(true, testFile.EntireFileIsValid);
}
