/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="ContentDescriptionObject" /> by reading the
/// contents from a specified position in a specified file.
/// </summary>
/// <param name="file">
/// A <see cref="Asf.File" /> object containing the file from
/// which the contents of the new instance are to be read.
/// </param>
/// <param name="position">
/// A <see cref="long" /> value specify at what position to
/// read the object.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="file" /> is <see langword="null" />.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="position" /> is less than zero or greater
/// than the size of the file.
/// </exception>
/// <exception cref="CorruptFileException">
/// The object read from disk does not have the correct GUID
/// or smaller than the minimum size.
/// </exception>
public ContentDescriptionObject(File file, long position)
: base(file, position)
{
if (Guid != Asf.Guid.AsfContentDescriptionObject)
{
throw new CorruptFileException("Object GUID incorrect.");
}
if (OriginalSize < 34)
{
throw new CorruptFileException("Object size too small.");
}
ushort title_length = file.ReadWord();
ushort author_length = file.ReadWord();
ushort copyright_length = file.ReadWord();
ushort description_length = file.ReadWord();
ushort rating_length = file.ReadWord();
title = file.ReadUnicode(title_length);
author = file.ReadUnicode(author_length);
copyright = file.ReadUnicode(copyright_length);
description = file.ReadUnicode(description_length);
rating = file.ReadUnicode(rating_length);
}
/// <summary>
/// Populates the current instance by reading in the contents
/// from a file.
/// </summary>
/// <param name="file">
/// A <see cref="Asf.File" /> object to read the raw ASF
/// Description Record from.
/// </param>
/// <returns>
/// <see langword="true" /> if the data was read correctly.
/// Otherwise <see langword="false" />.
/// </returns>
protected bool Parse(File file)
{
// Field name Field type Size (bits)
// Language List Index WORD 16
// Stream Number WORD 16
// Name Length WORD 16
// Data Type WORD 16
// Data Length DWORD 32
// Name WCHAR varies
// Data See below varies
LanguageListIndex = file.ReadWord();
StreamNumber = file.ReadWord();
ushort name_length = file.ReadWord();
Type = (DataType)file.ReadWord();
int data_length = (int)file.ReadDWord();
Name = file.ReadUnicode(name_length);
switch (Type)
{
case DataType.Word:
longValue = file.ReadWord();
break;
case DataType.Bool:
case DataType.DWord:
longValue = file.ReadDWord();
break;
case DataType.QWord:
longValue = file.ReadQWord();
break;
case DataType.Unicode:
strValue = file.ReadUnicode(data_length);
break;
case DataType.Bytes:
byteValue = file.ReadBlock(data_length);
break;
case DataType.Guid:
guidValue = file.ReadGuid();
break;
default:
return(false);
}
return(true);
}
/// <summary>
/// Populates the current instance by reading in the contents
/// from a file.
/// </summary>
/// <param name="file">
/// A <see cref="Asf.File" /> object to read the raw ASF
/// Content Descriptor from.
/// </param>
/// <returns>
/// <see langword="true" /> if the data was read correctly.
/// Otherwise <see langword="false" />.
/// </returns>
protected bool Parse(File file)
{
int name_count = file.ReadWord();
Name = file.ReadUnicode(name_count);
Type = (DataType)file.ReadWord();
int value_count = file.ReadWord();
switch (Type)
{
case DataType.Word:
longValue = file.ReadWord();
break;
case DataType.Bool:
longValue = file.ReadDWord();
break;
case DataType.DWord:
longValue = file.ReadDWord();
break;
case DataType.QWord:
longValue = file.ReadQWord();
break;
case DataType.Unicode:
strValue = file.ReadUnicode(value_count);
break;
case DataType.Bytes:
byteValue = file.ReadBlock(value_count);
break;
default:
return(false);
}
return(true);
}