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));
}
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 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 {
Image image = Image.Load(memoryImageBuffer);
return(new PictureFrame(dataField.Data, image, descriptionField.Text, (PictureType)pictureTypeField.Value));
}
catch (ArgumentException) {
throw new FrameParsingException("Unrecognized picture format found in Picture frame.");
}
}
//Tests the Read method of the class.
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);
}
}
//Tests the Write method of the class.
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 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));
}
