/// <summary>
/// Initializes a new instance of the <code>ElementDescriptor</code> class.
/// </summary>
/// <param name="identifier">the element identifier</param>
/// <param name="name">the element name or <code>null</code> if the name is not known</param>
/// <param name="type">the element type or <code>null</code> if the type is not known</param>
/// <exception cref="ArgumentNullException">if <code>identifier</code> is <code>null</code></exception>
public ElementDescriptor(VInt identifier, String name, ElementType type)
{
if (!identifier.IsValidIdentifier)
throw new ArgumentException("Value is not valid identifier", "identifier");
_identifier = identifier;
_name = name;
_type = type;
}
internal MasterBlockWriter(EbmlWriter writer, VInt elementId)
: base(new MemoryStream())
{
var flushed = false;
_flushImpl = () =>
{
if (flushed) return;
var data = ((MemoryStream) _stream).ToArray();
writer.Write(elementId, data);
flushed = true;
_stream.Close();
};
}
/// <summary>
/// Starts nested stream. Upon disposal of nested stream, the size is calculated and written to nested element header.
/// Example:
/// using(var data = writer.StartMasterElement(InnerDataElementId))
/// {
/// data.WriteInt(DataItem1Id, 139874)
/// data.WriteUtf(DataItem2Id, "Hello world");
/// }
/// </summary>
/// <param name="elementId"></param>
/// <returns></returns>
public MasterBlockWriter StartMasterElement(VInt elementId)
{
return new MasterBlockWriter(this, elementId);
}
/// <summary>
/// Writes string in UTF-8 encoding
/// </summary>
/// <param name="elementId"></param>
/// <param name="value"></param>
/// <returns></returns>
public int WriteUtf(VInt elementId, string value)
{
if (value == null) throw new ArgumentNullException("value");
if (!value.IsNormalized(NormalizationForm.FormC))
{
value = value.Normalize(NormalizationForm.FormC);
}
var buffer = string.IsNullOrEmpty(value) ? new byte[0] : Encoding.UTF8.GetBytes(value);
return Write(elementId, buffer, 0, buffer.Length);
}
/// <summary>
/// Writes element header
/// </summary>
/// <param name="elementId"></param>
/// <param name="size"></param>
/// <returns></returns>
public int WriteElementHeader(VInt elementId, VInt size)
{
return elementId.Write(_stream) + size.Write(_stream);
}
/// <summary>
/// Writes string in ASCII encoding
/// </summary>
/// <param name="elementId"></param>
/// <param name="value"></param>
/// <returns></returns>
public int WriteAscii(VInt elementId, string value)
{
if (value == null) throw new ArgumentNullException("value");
var buffer = string.IsNullOrEmpty(value) ? new byte[0] : Encoding.ASCII.GetBytes(value);
return Write(elementId, buffer, 0, buffer.Length);
}
/// <summary>
/// Writes binary data
/// </summary>
/// <param name="elementId"></param>
/// <param name="data"></param>
/// <returns></returns>
public int Write(VInt elementId, byte[] data)
{
return Write(elementId, data, 0, data.Length);
}
/// <summary>
/// Writes binary data
/// </summary>
/// <param name="elementId"></param>
/// <param name="data"></param>
/// <returns></returns>
public int Write(VInt elementId, byte[] data)
{
return(Write(elementId, data, 0, data.Length));
}
/// <summary>
/// Writes floating point number
/// </summary>
/// <param name="elementId"></param>
/// <param name="value"></param>
/// <returns></returns>
public int Write(VInt elementId, float value)
{
var u = new Union {fval = value}.uival;
return elementId.Write(_stream) + EncodeWidth(4).Write(_stream) + WriteInt(u, 4);
}
/// <summary>
/// Writes datetime value
/// </summary>
/// <param name="elementId"></param>
/// <param name="dateTime"></param>
/// <returns></returns>
public int Write(VInt elementId, DateTime dateTime)
{
var d = (dateTime - EbmlReader.MilleniumStart).Ticks * 100;
return elementId.Write(_stream) + EncodeWidth(8).Write(_stream) + WriteInt(d, 8);
}
/// <summary>
/// Writes unsigned integer value
/// </summary>
/// <param name="elementId"></param>
/// <param name="value"></param>
/// <returns></returns>
public int Write(VInt elementId, UInt64 value)
{
var length = 0u;
for (var mask = UInt64.MaxValue; (value & mask) != 0 && length < 8; mask <<= 8)
{
length++;
}
return elementId.Write(_stream) + EncodeWidth(length).Write(_stream) + WriteUInt(value, length);
}
public bool Equals(VInt other)
{
return other._encodedValue == _encodedValue && other._length == _length;
}
/// <summary>
/// Initializes a new instance of the <code>ElementDescriptor</code> class.
/// </summary>
/// <param name="identifier"></param>
/// <param name="name"></param>
/// <param name="type"></param>
public ElementDescriptor(long identifier, string name, ElementType type)
: this(VInt.FromEncoded((ulong)identifier), name, type)
{
}
/// <summary>
/// Writes element header
/// </summary>
/// <param name="elementId"></param>
/// <param name="size"></param>
/// <returns></returns>
public int WriteElementHeader(VInt elementId, VInt size)
{
return(elementId.Write(_stream) + size.Write(_stream));
}
/// <summary>
/// Starts nested stream. Upon disposal of nested stream, the size is calculated and written to nested element header.
/// Example:
/// using(var data = writer.StartMasterElement(InnerDataElementId))
/// {
/// data.WriteInt(DataItem1Id, 139874)
/// data.WriteUtf(DataItem2Id, "Hello world");
/// }
/// </summary>
/// <param name="elementId"></param>
/// <returns></returns>
public MasterBlockWriter StartMasterElement(VInt elementId)
{
return(new MasterBlockWriter(this, elementId));
}
/// <summary>
/// Writes signed integer value
/// </summary>
/// <param name="elementId"></param>
/// <param name="value"></param>
/// <returns></returns>
public int Write(VInt elementId, Int64 value)
{
var length = value == 0 ? 0u : 1u;
unchecked
{
var mask = (long)0xffffffffffffff80L;
for (var expected = value < 0L ? mask : 0L; length < 8 && (mask & value) != expected; mask <<= 8, expected <<= 8)
{
length++;
}
}
return elementId.Write(_stream) + EncodeWidth(length).Write(_stream) + WriteInt(value, length);
}
public Element(VInt identifier, long sizeValue, ElementType type)
{
Identifier = identifier;
Size = sizeValue;
Remaining = sizeValue;
Type = type;
}
/// <summary>
/// Writes floating point number with double precision
/// </summary>
/// <param name="elementId"></param>
/// <param name="value"></param>
/// <returns></returns>
public int Write(VInt elementId, double value)
{
var u = new Union { dval = value }.ulval;
return elementId.Write(_stream) + EncodeWidth(8).Write(_stream) + WriteUInt(u, 8);
}
/// <summary>
/// Writes binary data
/// </summary>
/// <param name="elementId"></param>
/// <param name="data"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <returns></returns>
public int Write(VInt elementId, byte[] data, int offset, int length)
{
var headLen = elementId.Write(_stream) + EncodeWidth((uint) length).Write(_stream);
_stream.Write(data, offset, length);
return headLen + length;
}
/// <summary>
/// Writes datetime value
/// </summary>
/// <param name="elementId"></param>
/// <param name="dateTime"></param>
/// <returns></returns>
public int Write(VInt elementId, DateTime dateTime)
{
var d = (dateTime - EbmlReader.MilleniumStart).Ticks * 100;
return(elementId.Write(_stream) + EncodeWidth(8).Write(_stream) + WriteInt(d, 8));
}
