/// <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 langref="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 (Asf.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 (Asf.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
lang_list_index = file.ReadWord ();
stream_number = 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 (Asf.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;
}
