/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="PaddingObject" /> 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 StreamPropertiesObject(Asf.File file, long position)
: base(file, position)
{
if (!Guid.Equals(Asf.Guid.AsfStreamPropertiesObject))
{
throw new CorruptFileException(
"Object GUID incorrect.");
}
if (OriginalSize < 78)
{
throw new CorruptFileException(
"Object size too small.");
}
stream_type = file.ReadGuid();
error_correction_type = file.ReadGuid();
time_offset = file.ReadQWord();
int type_specific_data_length = (int)file.ReadDWord();
int error_correction_data_length = (int)
file.ReadDWord();
flags = file.ReadWord();
reserved = file.ReadDWord();
type_specific_data =
file.ReadBlock(type_specific_data_length);
error_correction_data =
file.ReadBlock(error_correction_data_length);
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="FilePropertiesObject" /> 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 FilePropertiesObject(Asf.File file, long position)
: base(file, position)
{
if (!Guid.Equals(Asf.Guid.AsfFilePropertiesObject))
{
throw new CorruptFileException(
"Object GUID incorrect.");
}
if (OriginalSize < 104)
{
throw new CorruptFileException(
"Object size too small.");
}
file_id = file.ReadGuid();
file_size = file.ReadQWord();
creation_date = file.ReadQWord();
data_packets_count = file.ReadQWord();
send_duration = file.ReadQWord();
play_duration = file.ReadQWord();
preroll = file.ReadQWord();
flags = file.ReadDWord();
minimum_data_packet_size = file.ReadDWord();
maximum_data_packet_size = file.ReadDWord();
maximum_bitrate = file.ReadDWord();
}
/// <summary>
/// Constructs and initializes a new instance of <see
/// cref="HeaderExtensionObject" /> 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 contents.
/// </exception>
public HeaderExtensionObject(Asf.File file, long position)
: base(file, position)
{
if (!Guid.Equals(Asf.Guid.AsfHeaderExtensionObject))
{
throw new CorruptFileException(
"Object GUID incorrect.");
}
if (file.ReadGuid() != Asf.Guid.AsfReserved1)
{
throw new CorruptFileException(
"Reserved1 GUID expected.");
}
if (file.ReadWord() != 6)
{
throw new CorruptFileException(
"Invalid reserved WORD. Expected '6'.");
}
uint size_remaining = file.ReadDWord();
position += 0x170 / 8;
while (size_remaining > 0)
{
Object obj = file.ReadObject(position);
position += (long)obj.OriginalSize;
size_remaining -= (uint)obj.OriginalSize;
children.Add(obj);
}
}
/// <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);
}
protected Object(Asf.File file, long position)
{
if (file == null)
{
throw new ArgumentNullException("file");
}
if (position < 0 || position > file.Length - 24)
{
throw new ArgumentOutOfRangeException("position");
}
file.Seek(position);
id = file.ReadGuid();
size = file.ReadQWord();
}
protected bool Parse(Asf.File file)
{
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);
}
