protected override Frame ParseFrame(byte[] data)
{
int place=0;
SingleByteField encodingField=new SingleByteField();
place+=encodingField.Parse(data, place);
TextField imageFormatField=TextField.CreateTextField(true,EncodingScheme.Ascii);
place+=imageFormatField.Parse(data, place);
SingleByteField pictureTypeField=new SingleByteField();
place+=pictureTypeField.Parse(data, place);
TextField descriptionField=TextField.CreateTextField(true,(EncodingScheme)encodingField.Value);
place+=descriptionField.Parse(data, place);
BinaryField dataField=new BinaryField();
place+=dataField.Parse(data, place);
System.IO.MemoryStream memoryImageBuffer=new System.IO.MemoryStream(dataField.Data);
try
{
System.Drawing.Image image=System.Drawing.Image.FromStream(memoryImageBuffer);
return new PictureFrame(dataField.Data, image, descriptionField.Text, (PictureType)pictureTypeField.Value);
}
catch(ArgumentException)
{
throw new FrameParsingException("Unrecognized picture format found in Picture frame.");
}
}
protected override Frame ParseFrame(byte[] data)
{
//Text encoding $xx
//MIME type <text string> $00
//Filename <text string according to encoding> $00 (00)
//Content description <text string according to encóding> $00 (00)
//Encapsulated object <binary data>
int place=0;
SingleByteField encodingField=new SingleByteField();
place+=encodingField.Parse(data, place);
TextField mimeTypeField=TextField.CreateTextField(true,EncodingScheme.Ascii);
place+=mimeTypeField.Parse(data, place);
TextField fileNameField=TextField.CreateTextField(true,(EncodingScheme)encodingField.Value);
place+=fileNameField.Parse(data, place);
TextField contentDescriptionField=TextField.CreateTextField(true, (EncodingScheme)encodingField.Value);
place+=contentDescriptionField.Parse(data, place);
BinaryField dataField=new BinaryField();
place+=dataField.Parse(data, place);
return new GeneralEncapsulatedObjectFrame(
fileNameField.Text,
contentDescriptionField.Text,
mimeTypeField.Text,
dataField.Data);
}
public void TestRead()
{
for(int testCase=0;testCase<100;testCase++)
{
byte[] randomData=new byte[_randomNumberGenerator.Next(1, 50000)];
int offset=_randomNumberGenerator.Next(0, randomData.Length-1);
_randomNumberGenerator.NextBytes(randomData);
SingleByteField field=new SingleByteField();
field.Parse(randomData, offset);
Assert.AreEqual(randomData[offset], field.Value);
}
}
public void TestWrite()
{
for(int testCase=0;testCase<100;testCase++)
{
byte[] randomData=new byte[1];
_randomNumberGenerator.NextBytes(randomData);
SingleByteField field=new SingleByteField(randomData[0]);
MemoryStream stream=new MemoryStream();
field.WriteToStream(stream);
Assert.AreEqual(stream.Length, 1);
Assert.AreEqual(randomData[0], stream.GetBuffer()[0]);
}
}
/// <summary>
/// Returns the text encoded in a text frame.
/// </summary>
/// <param name="data">Byte array to parse the text frame out of.</param>
/// <returns>The string encoded in the text frame.</returns>
protected static string ParseTextFrame(byte[] data)
{
//Text encoding $xx
//Information <text string according to encoding>
int place=0;
SingleByteField encodingField=new SingleByteField();
place+=encodingField.Parse(data, place);
TextField textField=TextField.CreateTextField(false, (EncodingScheme)encodingField.Value);
place+=textField.Parse(data, place);
return textField.Text;
}
protected static string ParseExtendedTextFrame(byte[] data, out string description, out LanguageCode language)
{
int place=0;
SingleByteField encodingField=new SingleByteField();
place+=encodingField.Parse(data, place);
FixedLengthAsciiTextField langField=new FixedLengthAsciiTextField(3);
place+=langField.Parse(data, place);
TextField descriptinoField=TextField.CreateTextField(true,(EncodingScheme)encodingField.Value);
place+=descriptinoField.Parse(data, place);
TextField textField=TextField.CreateTextField(false,(EncodingScheme)encodingField.Value);
place+=textField.Parse(data, place);
if(!Enum.IsDefined(typeof(LanguageCode), langField.Text))
{
langField.Text="Unknown";
}
language=(LanguageCode)Enum.Parse(typeof(LanguageCode), langField.Text);
description=descriptinoField.Text;
return textField.Text;
}
protected override Frame ParseFrame(byte[] data)
{
int place=0;
SingleByteField encodingField=new SingleByteField();
place+=encodingField.Parse(data, place);
TextField lastPlayedOnField=TextField.CreateTextField(true, EncodingScheme.Ascii);
place+=lastPlayedOnField.Parse(data, place);
TextField playCountField=TextField.CreateTextField(true, EncodingScheme.Ascii);
place+=playCountField.Parse(data, place);
TextField memoField=TextField.CreateTextField(true, EncodingScheme.Ascii);
place+=memoField.Parse(data, place);
DateTime lastPlayed;
if(!DateTime.TryParse(lastPlayedOnField.Text, out lastPlayed))
{
throw new FrameParsingException("Invalid value in date field of LastPlayedOn frame.");
}
int playCount;
if(!int.TryParse(playCountField.Text, out playCount))
{
throw new FrameParsingException("Invalid value in play count field of LastPlayedOn frame.");
}
return new LastPlayedOnFrame(lastPlayed, playCount, memoField.Text);
}
