/// <summary>
/// Read an object reference.
/// </summary>
/// <param name="context">AMF decoding context.</param>
/// <param name="reader">AMF reader.</param>
/// <param name="index">Reference index.</param>
/// <param name="reference">Reference value.</param>
/// <returns>Referenced object or <c>null</c> if value does not contain a reference.</returns>
/// <exception cref="SerializationException">Invalid reference.</exception>
private static bool ReadReference(AmfContext context, AmfStreamReader reader, out int index, out int reference)
{
reference = ReadUint29(reader);
//The first bit is a flag with value 0 to imply that this is not an instance but a reference
if ((reference & 0x1) == 0)
{
//The remaining 1 to 28 significant bits are used to encode an object reference index
index = reference >> 1;
if (context.References.Count <= index)
throw new SerializationException("Invalid reference index: " + index);
return true;
}
index = -1;
return false;
}
/// <summary>
/// Read a strict array.
/// </summary>
/// <remarks>
/// Type declaration:
/// <c>array-count = U32
/// strict-array-type = array-count *(value-type)</c>
/// </remarks>
private void ReadStrictArray(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
context.References.Track();
var length = reader.ReadUInt32();
if (output != null)
{
output.WriteStartElement(AmfxContent.Array);
output.WriteAttributeString(AmfxContent.ArrayLength, length.ToString());
}
for (var i = 0; i < length; i++)
ReadAmfValue(context, reader, output);
if (output != null) output.WriteEndElement();
}
/// <summary>
/// Write an object.
/// </summary>
private void WriteObject(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
context.References.Add(new AmfReference { AmfxType = AmfxContent.Object });
WriteTypeMarker(writer, Amf3TypeMarker.Object);
AmfTypeTraits traits;
var typeName = string.Empty;
if (input.HasAttributes)
typeName = input.GetAttribute(AmfxContent.ObjectType);
#region Write traits
input.Read();
//Send traits by value
if (!input.IsEmptyElement)
{
traits = new AmfTypeTraits { TypeName = typeName };
context.TraitsReferences.Add(traits);
var traitsReader = input.ReadSubtree();
traitsReader.MoveToContent();
traitsReader.ReadStartElement();
var members = new List<string>();
while (input.NodeType != XmlNodeType.EndElement)
members.Add(traitsReader.ReadElementContentAsString());
traits.ClassMembers = members.ToArray();
//The first bit is a flag with value 1.
//The second bit is a flag with value 1.
//The third bit is a flag with value 0.
var flag = 0x3; //00000011
if (traits.IsExternalizable) flag |= 0x4; //00000111
//The fourth bit is a flag specifying whether the type is dynamic.
//A value of 0 implies not dynamic, a value of 1 implies dynamic.
if (traits.IsDynamic) flag |= 0x8; //00001011
//The remaining 1 to 25 significant bits are used to encode the number
//of sealed traits member names that follow after the class name.
var count = traits.ClassMembers.Count();
flag |= count << 4;
WriteUInt29(writer, flag);
WriteUtf8(context, writer, traits.TypeName);
//Write member names
foreach (var member in traits.ClassMembers)
WriteUtf8(context, writer, member);
}
//Send traits by reference
else
{
var index = Convert.ToInt32(input.GetAttribute(AmfxContent.TraitsId), CultureInfo.InvariantCulture);
traits = context.TraitsReferences[index];
var flag = index & UInt29Mask; //Truncate value to UInt29
//The first bit is a flag with value 1.
//The second bit is a flag (representing whether a trait
//reference follows) with value 0 to imply that this objects
//traits are being sent by reference. The remaining 1 to 27
//significant bits are used to encode a trait reference index.
flag = (flag << 2) | 0x1;
WriteUInt29(writer, flag);
}
input.Read();
#endregion
#region Write members
for (var i = 0; i < traits.ClassMembers.Length; i++)
{
WriteAmfValue(context, input, writer);
input.Read();
}
#endregion
}
/// <summary>
/// Write an XML.
/// </summary>
private static void WriteXml(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
context.References.Add(new AmfReference {AmfxType = AmfxContent.Xml});
WriteTypeMarker(writer, Amf3TypeMarker.Xml);
input.Read();
var encoded = input.Value;
input.Read();
var decoded = Encoding.UTF8.GetBytes(encoded);
WriteUtf8(writer, decoded);
}
/// <summary>
/// Write a string.
/// </summary>
private static void WriteString(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
WriteTypeMarker(writer, Amf3TypeMarker.String);
string value;
if (input.IsEmptyElement)
{
if (input.AttributeCount > 0)
{
var index = Convert.ToInt32(input.GetAttribute(AmfxContent.StringId), CultureInfo.InvariantCulture);
WriteReference(writer, index);
return;
}
value = string.Empty;
}
else
{
input.Read();
value = input.Value;
input.Read();
}
WriteUtf8(context, writer, value);
}
/// <summary>
/// Write a date.
/// </summary>
private static void WriteDate(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
context.References.Add(new AmfReference { AmfxType = AmfxContent.Date });
WriteTypeMarker(writer, Amf3TypeMarker.Date);
var milliseconds = input.ReadElementContentAsDouble();
//The first bit is a flag with value 1.
//The remaining bits are not used.
WriteUInt29(writer, 0 | 0x1);
writer.Write(milliseconds);
}
/// <summary>
/// Read a string reference.
/// </summary>
/// <param name="context">AMF decoding context.</param>
/// <param name="reader">AMF reader.</param>
/// <param name="index">Reference index.</param>
/// <param name="reference">Reference value.</param>
/// <returns>Referenced string or <c>null</c> if value does not contain a reference.</returns>
/// <exception cref="SerializationException">Invalid reference.</exception>
private static string ReadStringReference(AmfContext context, AmfStreamReader reader, out int index, out int reference)
{
reference = ReadUint29(reader);
//The first bit is a flag with value 0
if ((reference & 0x1) == 0)
{
//The remaining 1 to 28 significant bits are used to encode a string reference table index
index = reference >> 1;
if (context.StringReferences.Count <= index)
throw new SerializationException("Invalid reference index: " + index);
return context.StringReferences[index];
}
index = -1;
return null;
}
/// <summary>
/// Read an object.
/// </summary>
private void ReadObject(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
var reference = reader.PeekChar();
int index;
if ((reference & 0x1) == 0 && ReadReference(context, reader, out index, out reference))
{
if (output != null) WriteReference(index, output);
return;
}
context.References.Track();
int traitsindex, traitsreference;
AmfTypeTraits traits;
#region Read object's traits
if ((traits = ReadTraitsReference(context, reader, out traitsindex, out traitsreference)) == null)
{
var isExternalizable = ((traitsreference & 0x4) == 4);
var isDynamic = ((traitsreference & 0x8) == 8);
var typeName = ReadString(context, reader);
var count = (traitsreference >> 4);
var classMembers = new string[count];
for (var i = 0; i < count; i++)
classMembers[i] = ReadString(context, reader);
traits = new AmfTypeTraits
{
IsDynamic = isDynamic,
IsExternalizable = isExternalizable,
TypeName = typeName,
//No property names are included for types
//that are externizable or dynamic
ClassMembers = isDynamic || isExternalizable
? new string[0]
: classMembers
};
context.TraitsReferences.Add(traits);
}
#endregion
#if DEBUG
Debug.WriteLine(string.Format(Errors.Amf3Decoder_ReadObject_Debug_Name, traits.TypeName));
if (traits.IsDynamic)
Debug.WriteLine(Errors.Amf3Decoder_ReadObject_Debug_Dynamic);
else if (traits.IsExternalizable)
Debug.WriteLine(Errors.Amf3Decoder_ReadObject_Debug_Externizable);
else
Debug.WriteLine(string.Format(Errors.Amf3Decoder_ReadObject_Debug_Members, traits.ClassMembers.Length));
#endif
using (var ms = new MemoryStream())
{
#region Reading object members
var members = new List<string>();
var settings = new XmlWriterSettings
{
};
var buffer = XmlWriter.Create(ms, settings);
buffer.WriteStartDocument();
buffer.WriteStartElement("buffer", AmfxContent.Namespace);
#if DEBUG
var memberPosition = 0;
#endif
//Read object's properties
foreach (var classMember in traits.ClassMembers)
{
#if DEBUG
Debug.WriteLine(string.Format(Errors.Amf3Decoder_ReadObject_Debug_ReadingField, memberPosition,
classMember));
memberPosition++;
#endif
ReadAmfValue(context, reader, buffer);
members.Add(classMember);
}
//Read dynamic properties too
if (traits.IsDynamic)
{
#if DEBUG
Debug.WriteLine(Errors.Amf3Decoder_ReadObject_Debug_ReadingDynamic);
#endif
var key = ReadString(context, reader);
while (key != string.Empty)
{
#if DEBUG
Debug.WriteLine(string.Format(Errors.Amf3Decoder_ReadObject_Debug_ReadingDynamicField, key));
#endif
ReadAmfValue(context, reader, buffer);
members.Add(key);
key = ReadString(context, reader);
}
#if DEBUG
Debug.WriteLine(Errors.Amf3Decoder_ReadObject_Debug_DynamicEnd);
#endif
}
buffer.WriteEndElement();
buffer.WriteEndDocument();
buffer.Flush();
#endregion
#if DEBUG
Debug.WriteLine(Errors.Amf3Decoder_ReadObject_Debug_End);
#endif
#region Writing member values
if (output != null)
{
output.WriteStartElement(AmfxContent.Object);
if (traits.TypeName != AmfTypeTraits.BaseTypeAlias)
output.WriteAttributeString(AmfxContent.ObjectType, traits.TypeName);
output.WriteStartElement(AmfxContent.Traits);
//Regular traits object
//Always write traits for dynamic objects
if (traitsindex == -1 || traits.IsDynamic)
{
if (traits.IsExternalizable)
{
output.WriteAttributeString(AmfxContent.TraitsExternizable, AmfxContent.True);
}
else
{
//Write object members
foreach (var classMember in members)
{
output.WriteStartElement(AmfxContent.String);
output.WriteValue(classMember);
output.WriteEndElement();
}
}
}
//Traits object reference
else
{
output.WriteAttributeString(AmfxContent.TraitsId, traitsindex.ToString());
}
output.WriteEndElement(); //End of traits
//Write object members
if (members.Count > 0)
{
ms.Position = 0;
var bufferreader = XmlReader.Create(ms);
bufferreader.Read();
bufferreader.ReadStartElement();
while (bufferreader.Depth >= 1)
output.WriteNode(bufferreader, false);
}
output.WriteEndElement(); //End of object
}
#endregion
}
}
protected override void WriteAmfValue(AmfContext context, XmlReader input, AmfStreamWriter writer)
{
if (context.AmfVersion != AmfVersion.Amf0)
throw new InvalidOperationException(string.Format(Errors.Amf0Decoder_ReadAmfValue_AmfVersionNotSupported, context.AmfVersion));
if (input == null) throw new ArgumentNullException("input");
if (context == null) throw new ArgumentNullException("context");
if (input.NodeType != XmlNodeType.Element) throw new XmlException(string.Format("Element node expected, {0} found.", input.NodeType));
#region Primitive values
switch (input.Name)
{
case AmfxContent.Null:
WriteNull(writer);
return;
case AmfxContent.True:
WriteBoolean(writer, true);
return;
case AmfxContent.False:
WriteBoolean(writer, false);
return;
}
#endregion
#region Complex values
var reader = input.ReadSubtree();
reader.MoveToContent();
switch (reader.Name)
{
case AmfxContent.Integer:
case AmfxContent.Double:
WriteNumber(writer, reader);
break;
case AmfxContent.String:
WriteString(writer, reader);
break;
case AmfxContent.Date:
WriteDate(writer, reader);
break;
case AmfxContent.Xml:
WriteXml(writer, reader);
break;
case AmfxContent.Reference:
WriteReference(context, writer, reader);
break;
case AmfxContent.Array:
WriteArray(context, writer, reader);
break;
case AmfxContent.Object:
WriteObject(context, writer, reader);
break;
default:
throw new NotSupportedException("Unexpected AMFX type: " + reader.Name);
}
#endregion
}
/// <summary>
/// Write an object.
/// </summary>
private void WriteObject(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
context.References.Add(new AmfReference { AmfxType = AmfxContent.Object });
WriteTypeMarker(writer, Amf0TypeMarker.Object);
var typeName = string.Empty;
if (input.HasAttributes)
typeName = input.GetAttribute(AmfxContent.ObjectType);
#region Read traits
var traits = new AmfTypeTraits { TypeName = typeName };
while (input.Read())
{
if (input.NodeType != XmlNodeType.Element && input.Name != AmfxContent.Traits) continue;
if (!input.IsEmptyElement)
{
var traitsReader = input.ReadSubtree();
traitsReader.MoveToContent();
traitsReader.ReadStartElement();
var members = new List<string>();
while (input.NodeType != XmlNodeType.EndElement)
members.Add(traitsReader.ReadElementContentAsString());
traits.ClassMembers = members.ToArray();
}
break;
}
#endregion
#region Type name
//Untyped object
if(string.IsNullOrEmpty(traits.TypeName))
{
WriteTypeMarker(writer, Amf0TypeMarker.Object);
}
//Strongly-typed object
else
{
WriteTypeMarker(writer, Amf0TypeMarker.TypedObject);
var typeNameData = Encoding.UTF8.GetBytes(traits.TypeName);
writer.Write((ushort)typeNameData.Length);
writer.Write(typeNameData);
}
#endregion
#region Write members
var i = 0;
while (input.Read())
{
if (input.NodeType != XmlNodeType.Element) continue;
var memberName = traits.ClassMembers[i];
var memberReader = input.ReadSubtree();
memberReader.MoveToContent();
WriteUtf8(writer, memberName);
WriteAmfValue(context, memberReader, writer);
i++;
}
#endregion
WriteUtf8(writer, string.Empty);
WriteTypeMarker(writer, Amf0TypeMarker.ObjectEnd);
}
/// <summary>
/// Write an array.
/// </summary>
private void WriteArray(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
context.References.Add(new AmfReference {AmfxType = AmfxContent.Array});
var length = Convert.ToUInt32(input.GetAttribute(AmfxContent.ArrayLength));
writer.Write(length);
if (length == 0) return;
input.MoveToContent();
while (input.Read())
{
if (input.NodeType != XmlNodeType.Element)
continue;
for (var i = 0; i < length; i++)
{
var itemreader = input.ReadSubtree();
itemreader.MoveToContent();
WriteAmfValue(context, itemreader, writer);
}
}
}
/// <summary>
/// Write a reference value.
/// </summary>
private static void WriteReference(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
var index = Convert.ToInt32(input.GetAttribute(AmfxContent.ReferenceId));
var proxy = context.References[index];
switch(proxy.AmfxType)
{
case AmfxContent.Array:
case AmfxContent.Object:
WriteTypeMarker(writer, Amf0TypeMarker.Reference);
writer.Write((ushort)index);
break;
default:
throw new InvalidOperationException(string.Format("AMFX type '{0}' cannot be send by reference.", proxy.AmfxType));
}
}
/// <summary> /// Read AMF value from the current position. /// </summary> /// <param name="context">AMF context.</param> /// <param name="reader">AMF stream reader.</param> /// <param name="output">AMFX output writer.</param> /// <exception cref="NotSupportedException">AMF type is not supported.</exception> /// <exception cref="FormatException">Invalid data format.</exception> /// <exception cref="SerializationException">Error during deserialization.</exception> protected abstract void ReadAmfValue(AmfContext context, AmfStreamReader reader, XmlWriter output = null);
protected override void ReadAmfValue(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
if (context.AmfVersion != AmfVersion.Amf0)
throw new InvalidOperationException(string.Format(Errors.Amf0Decoder_ReadAmfValue_AmfVersionNotSupported, context.AmfVersion));
Amf0TypeMarker dataType;
try
{
//Read a type marker byte
dataType = (Amf0TypeMarker)reader.ReadByte();
}
catch (Exception e)
{
throw new FormatException(Errors.Amf0Decoder_ReadAmfValue_TypeMarkerMissing, e);
}
//Special case
if(dataType == Amf0TypeMarker.AvmPlusObject)
{
var newContext = new AmfContext(AmfVersion.Amf3);
ReadAmfValue(newContext, reader, output);
return;
}
ReadValue(context, reader, dataType, output);
}
/// <summary>
/// Read a value of a given type from current reader's position.
/// </summary>
/// <remarks>
/// Current reader position must be just after a value type marker of a type to read.
/// </remarks>
/// <param name="context">AMF decoding context.</param>
/// <param name="reader">AMF stream reader.</param>
/// <param name="type">Type of the value to read.</param>
/// <param name="output">AMFX output.</param>
/// <exception cref="NotSupportedException">AMF type is not supported.</exception>
/// <exception cref="FormatException">Unknown data format.</exception>
/// <exception cref="SerializationException">Error during deserialization.</exception>
private void ReadValue(AmfContext context, AmfStreamReader reader, Amf0TypeMarker type, XmlWriter output = null)
{
switch (type)
{
case Amf0TypeMarker.Null:
case Amf0TypeMarker.Undefined:
break;
case Amf0TypeMarker.Boolean:
reader.ReadBoolean();
break;
case Amf0TypeMarker.Number:
reader.ReadDouble();
break;
case Amf0TypeMarker.String:
ReadString(reader, output);
break;
case Amf0TypeMarker.LongString:
ReadLongString(reader, output);
break;
case Amf0TypeMarker.Date:
ReadDate(reader, output);
break;
case Amf0TypeMarker.XmlDocument:
ReadXml(reader, output);
break;
case Amf0TypeMarker.Reference:
ReadReference(context, reader, output);
break;
case Amf0TypeMarker.Object:
ReadObject(context, reader, output);
break;
case Amf0TypeMarker.TypedObject:
ReadObject(context, reader, output, true);
break;
case Amf0TypeMarker.EcmaArray:
ReadEcmaArray(context, reader, output);
break;
case Amf0TypeMarker.StrictArray:
ReadStrictArray(context, reader, output);
break;
case Amf0TypeMarker.MovieClip:
case Amf0TypeMarker.RecordSet:
case Amf0TypeMarker.Unsupported:
throw new NotSupportedException(string.Format(Errors.Amf0Deserializer_ReadValue_UnsupportedType, type));
default:
throw new FormatException(string.Format(Errors.Amf0Decoder_ReadValue_UnknownType, (byte)type));
}
if (output != null) output.Flush();
}
/// <summary>
/// Read an XML document.
/// </summary>
/// <remarks>
/// Type declaration:
/// <c>U29X-value = U29 (The first (low) bit is a flag with value 1.
/// The remaining 1 to 28 significant bits are used to encode the byte-length
/// of the UTF-8 encoded representation of the XML or XMLDocument).
/// xml-doc-type = xml-doc-marker (U29O-ref | (U29X-value *(UTF8-char)))</c>
/// </remarks>
private static void ReadXml(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
int index, reference;
if (ReadReference(context, reader, out index, out reference))
{
if (output != null) WriteReference(index, output);
return;
}
context.References.Track();
//Get XML string length
var length = (reference >> 1);
var value = ReadUtf8(reader, length);
if (output != null)
{
output.WriteStartElement(AmfxContent.Xml);
output.WriteValue(value);
output.WriteEndElement();
}
}
/// <summary>
/// Read an array.
/// </summary>
/// <remarks>
/// Type declaration:
/// <c>U29A-value = U29 (The first (low) bit is a flag with value 1.
/// The remaining 1 to 28 significant bits are used to encode
/// the count of the dense portion of the Array).
/// assoc-value = UTF-8-vr value-type
/// array-type = array-marker (U29O-ref |
/// (U29A-value (UTF-8-empty | *(assoc-value) UTF-8-empty) *(value-type)))</c>
/// </remarks>
private void ReadArray(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
int index, reference;
if (ReadReference(context, reader, out index, out reference))
{
if (output != null) WriteReference(index, output);
return;
}
context.References.Track();
var length = reference >> 1;
var key = ReadString(context, reader);
if (output != null)
{
output.WriteStartElement(AmfxContent.Array);
output.WriteAttributeString(AmfxContent.ArrayLength, length.ToString());
}
//ECMA array
if (key != string.Empty)
{
if (output != null) output.WriteAttributeString(AmfxContent.ArrayEcma, AmfxContent.True);
//Read associative values
do
{
if (output != null)
{
output.WriteStartElement(AmfxContent.ArrayItem);
output.WriteAttributeString(AmfxContent.ArrayKey, key);
}
ReadAmfValue(context, reader, output);
key = ReadString(context, reader);
if (output != null) output.WriteEndElement();
}
while (key != string.Empty);
//Read array values
for (var i = 0; i < length; i++)
ReadAmfValue(context, reader, output);
}
//Regular array
else
{
//Read array values
for (var i = 0; i < length; i++)
ReadAmfValue(context, reader, output);
}
if (output != null) output.WriteEndElement();
}
/// <summary> /// Write AMF value from the current position. /// </summary> /// <param name="context">AMF decoding context.</param> /// <param name="input">AMFX input reader.</param> /// <param name="writer">AMF stream writer.</param> /// <exception cref="NotSupportedException">AMF type is not supported.</exception> /// <exception cref="FormatException">Invalid data format.</exception> /// <exception cref="SerializationException">Error during serialization.</exception> protected abstract void WriteAmfValue(AmfContext context, XmlReader input, AmfStreamWriter writer);
/// <summary>
/// Read a traits reference.
/// </summary>
/// <param name="context">AMF decoding context.</param>
/// <param name="reader">AMF reader.</param>
/// <param name="index">Reference index.</param>
/// <param name="reference">Reference value.</param>
/// <returns>Referenced traits object or <c>null</c> if value does not contain a reference.</returns>
/// <exception cref="SerializationException">Invalid reference.</exception>
private static AmfTypeTraits ReadTraitsReference(AmfContext context, AmfStreamReader reader, out int index, out int reference)
{
reference = ReadUint29(reader);
//The first bit is a flag with value 1. The second bit is a flag with value 0 to imply
//that this objects traits are being sent by reference
if ((reference & 0x3) == 1) //x01 & x11 == x01
{
//The remaining 1 to 27 significant bits are used to encode a trait reference index
index = reference >> 2;
if (context.TraitsReferences.Count <= index)
throw new SerializationException("Invalid reference index: " + index);
return context.TraitsReferences[index];
}
index = -1;
return null;
}
protected override void ReadAmfValue(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
//Work in a legacy context
if (context.AmfVersion == AmfVersion.Amf0)
{
base.ReadAmfValue(context, reader, output);
return;
}
Amf3TypeMarker dataType;
try
{
//Read a type marker byte
dataType = (Amf3TypeMarker)reader.ReadByte();
}
catch (Exception e)
{
#if DEBUG
Debug.WriteLine(string.Format(Errors.Amf3Decoder_ReadValue_InvalidMarker, reader.BaseStream.Position));
#endif
throw new FormatException(string.Format(Errors.Amf3Decoder_ReadValue_TypeMarkerNotFound, reader.BaseStream.Position), e);
}
ReadValue(context, reader, dataType, output);
#if DEBUG
Debug.WriteLine(string.Format(Errors.Amf3Decoder_ReadValue_End, dataType, reader.BaseStream.Position));
#endif
}
/// <summary>
/// Write a byte array.
/// </summary>
private static void WriteByteArray(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
context.References.Add(new AmfReference { AmfxType = AmfxContent.ByteArray });
WriteTypeMarker(writer, Amf3TypeMarker.ByteArray);
input.Read();
var encoded = input.Value;
input.Read();
var bytes = Convert.FromBase64String(encoded);
//The first bit is a flag with value 1.
//The remaining 1 to 28 significant bits are used
//to encode the byte-length of the data
var flag = (bytes.Length << 1) | 0x1;
WriteUInt29(writer, flag);
writer.Write(bytes);
}
/// <summary>
/// Read a value of a given type from current reader's position.
/// </summary>
/// <remarks>
/// Current reader position must be just after a value type marker of a type to read.
/// </remarks>
/// <param name="context">AMF decoding context.</param>
/// <param name="reader">AMF reader.</param>
/// <param name="type">Type of the value to read.</param>
/// <param name="output">AMFX output.</param>
/// <exception cref="NotSupportedException">AMF type is not supported.</exception>
/// <exception cref="FormatException">Unknown data format.</exception>
/// <exception cref="SerializationException">Error during deserialization.</exception>
private void ReadValue(AmfContext context, AmfStreamReader reader, Amf3TypeMarker type, XmlWriter output = null)
{
#if DEBUG
Debug.WriteLine(string.Format(Errors.Amf3Decoder_ReadValue_Debug, type, reader.BaseStream.Position));
#endif
switch (type)
{
case Amf3TypeMarker.Null:
case Amf3TypeMarker.Undefined:
WriteEmptyElement(type.ToAmfxName(), output);
break;
case Amf3TypeMarker.False:
WriteEmptyElement(type.ToAmfxName(), output);
break;
case Amf3TypeMarker.True:
WriteEmptyElement(type.ToAmfxName(), output);
break;
case Amf3TypeMarker.Integer:
ReadInteger(reader, output);
break;
case Amf3TypeMarker.Double:
ReadDouble(reader, output);
break;
case Amf3TypeMarker.String:
ReadString(context, reader, output);
break;
case Amf3TypeMarker.Date:
ReadDate(context, reader, output);
break;
case Amf3TypeMarker.ByteArray:
ReadByteArray(context, reader, output);
break;
case Amf3TypeMarker.Xml:
case Amf3TypeMarker.XmlDocument:
ReadXml(context, reader, output);
break;
case Amf3TypeMarker.Array:
ReadArray(context, reader, output);
break;
case Amf3TypeMarker.Object:
ReadObject(context, reader, output);
break;
default:
throw new NotSupportedException("Type '" + type + "' is not supported.");
}
if (output != null) output.Flush();
}
/// <summary>
/// Write an integer.
/// </summary>
private static void WriteReference(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
var index = Convert.ToInt32(input.GetAttribute(AmfxContent.ReferenceId), CultureInfo.InvariantCulture);
var proxy = context.References[index];
switch(proxy.AmfxType)
{
case AmfxContent.Date:
WriteTypeMarker(writer, Amf3TypeMarker.Date);
break;
case AmfxContent.Xml:
WriteTypeMarker(writer, Amf3TypeMarker.Xml);
break;
case AmfxContent.Array:
WriteTypeMarker(writer, Amf3TypeMarker.Array);
break;
case AmfxContent.ByteArray:
WriteTypeMarker(writer, Amf3TypeMarker.ByteArray);
break;
case AmfxContent.Object:
WriteTypeMarker(writer, Amf3TypeMarker.Object);
break;
default:
throw new InvalidOperationException(string.Format("AMFX type '{0}' cannot be send by reference.", proxy.AmfxType));
}
WriteReference(writer, index);
}
/// <summary>
/// Read a string.
/// </summary>
/// <remarks>
/// Type declaration:
/// <c>U29S-ref = U29 (The first (low) bit is a flag with value 0. The remaining 1 to 28
/// significant bits are used to encode a string reference table index (an integer)).
/// U29S-value = U29 (The first (low) bit is a flag with value 1. The remaining 1 to 28 significant
/// bits are used to encode the byte-length of the UTF-8 encoded representation of the string).
/// UTF-8-empty = 0x01 (The UTF-8-vr empty string which is never sent by reference).
/// UTF-8-vr = U29S-ref | (U29S-value *(UTF8-char))
/// string-type = string-marker UTF-8-vr</c>
/// </remarks>
private static string ReadString(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
int index, reference;
string cache;
if ((cache = ReadStringReference(context, reader, out index, out reference)) != null)
{
if (output != null)
{
output.WriteStartElement(AmfxContent.String);
output.WriteAttributeString(AmfxContent.StringId, index.ToString());
output.WriteEndElement();
}
return cache;
}
//Get string length
var length = (reference >> 1);
var value = ReadUtf8(reader, length);
if (value != string.Empty)
context.StringReferences.Add(value);
if (output != null)
{
output.WriteStartElement(AmfxContent.String);
output.WriteValue(value);
output.WriteEndElement();
}
return value;
}
/// <summary>
/// Write UTF-8 string.
/// </summary>
private static void WriteUtf8(AmfContext context, AmfStreamWriter writer, string value)
{
if (value == null) value = string.Empty;
//A special case
if (value == string.Empty)
{
writer.Write((byte)0x01);
return;
}
var index = context.StringReferences.IndexOf(value);
if(index != -1)
{
WriteReference(writer, index);
return;
}
context.StringReferences.Add(value);
var decoded = Encoding.UTF8.GetBytes(value);
WriteUtf8(writer, decoded);
}
/// <summary>
/// Read a date.
/// </summary>
/// <remarks>
/// Type declaration:
/// <c>U29D-value = U29 (The first (low) bit is a flag with value 1.
/// The remaining bits are not used).
/// date-time = DOUBLE (A 64-bit integer value transported as a double).
/// date-type = date-marker (U29O-ref | (U29D-value date-time))</c>
/// </remarks>
private static void ReadDate(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
int index, reference;
if (ReadReference(context, reader, out index, out reference))
{
if (output != null) WriteReference(index, output);
return;
}
context.References.Track();
//Dates are represented as an Unix time stamp, but in milliseconds
var milliseconds = reader.ReadDouble();
var value = milliseconds.ToString();
if (output != null)
{
output.WriteStartElement(AmfxContent.Date);
output.WriteValue(value);
output.WriteEndElement();
}
}
/// <summary>
/// Write an array.
/// </summary>
private void WriteArray(AmfContext context, AmfStreamWriter writer, XmlReader input)
{
context.References.Add(new AmfReference { AmfxType = AmfxContent.Array });
WriteTypeMarker(writer, Amf3TypeMarker.Array);
var length = Convert.ToInt32(input.GetAttribute(AmfxContent.ArrayLength), CultureInfo.InvariantCulture);
//The first bit is a flag with value 1.
//The remaining 1 to 28 significant bits
//are used to encode the count of the dense
//portion of the Array.
var size = (length << 1) | 0x1;
WriteUInt29(writer, size);
WriteUtf8(context, writer, string.Empty); //No associative values
if (length == 0) return;
input.Read();
for (var i = 0; i < length; i++)
{
WriteAmfValue(context, input, writer);
input.Read();
}
}
/// <summary>
/// Read a byte array.
/// </summary>
/// <remarks>
/// Type declaration:
/// <c>U29B-value = U29 (The first (low) bit is a flag with value 1.
/// The remaining 1 to 28 significant bits are used to encode the
/// byte-length of the ByteArray).
/// bytearray-type = bytearray-marker (U29O-ref | U29B-value *(U8))</c>
/// </remarks>
private static void ReadByteArray(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
int index, reference;
if (ReadReference(context, reader, out index, out reference))
{
if (output != null) WriteReference(index, output);
return;
}
context.References.Track();
//Get array length
var length = (reference >> 1);
var data = length == 0 ? new byte[] { } : reader.ReadBytes(length);
var value = Convert.ToBase64String(data);
if (output != null)
{
output.WriteStartElement(AmfxContent.ByteArray);
output.WriteValue(value);
output.WriteEndElement();
}
}
protected override void WriteAmfValue(AmfContext context, XmlReader input, AmfStreamWriter writer)
{
if (input == null) throw new ArgumentNullException("input");
if (context == null) throw new ArgumentNullException("context");
if (input.NodeType != XmlNodeType.Element) throw new XmlException(string.Format("Element node expected, {0} found.", input.NodeType));
if (context.AmfVersion != AmfVersion.Amf3)
{
context = new AmfContext(AmfVersion.Amf3);
writer.Write((byte)Amf0TypeMarker.AvmPlusObject);
}
#region Primitive values
switch (input.Name)
{
case AmfxContent.Null:
WriteTypeMarker(writer, Amf3TypeMarker.Null);
return;
case AmfxContent.True:
WriteTypeMarker(writer, Amf3TypeMarker.True);
return;
case AmfxContent.False:
WriteTypeMarker(writer, Amf3TypeMarker.False);
return;
}
#endregion
#region Complex values
switch (input.Name)
{
case AmfxContent.Integer:
WriteInteger(writer, input);
break;
case AmfxContent.Double:
WriteDouble(writer, input);
break;
case AmfxContent.String:
WriteString(context, writer, input);
break;
case AmfxContent.Reference:
WriteReference(context, writer, input);
break;
case AmfxContent.Date:
WriteDate(context, writer, input);
break;
case AmfxContent.Xml:
WriteXml(context, writer, input);
break;
case AmfxContent.Array:
WriteArray(context, writer, input);
break;
case AmfxContent.ByteArray:
WriteByteArray(context, writer, input);
break;
case AmfxContent.Object:
WriteObject(context, writer, input);
break;
default:
throw new NotSupportedException("Unexpected AMFX type: " + input.Name);
}
#endregion
}
/// <summary>
/// Read object properties map.
/// </summary>
/// <remarks>
/// Type declaration:
/// <c>object-property = (UTF-8 value-type) | (UTF-8-empty object-end-marker)</c>
/// </remarks>
/// <exception cref="SerializationException"></exception>
private IList<string> ReadPropertiesMap(AmfContext context, AmfStreamReader reader, XmlWriter output = null)
{
try
{
var result = new List<string>();
var property = ReadString(reader); //Read first property's name
//An empty property name indicates that object's declaration ends here
while (property != string.Empty)
{
result.Add(property);
ReadAmfValue(context, reader, output);
property = ReadString(reader);
}
//Last byte is always an "ObjectEnd" marker
var marker = (Amf0TypeMarker)reader.ReadByte();
//Something goes wrong
if (marker != Amf0TypeMarker.ObjectEnd)
throw new FormatException(Errors.Amf0Decoder_ReadPropertiesMap_UnexpectedObjectEnd);
return result;
}
catch (Exception e)
{
throw new SerializationException(Errors.Amf0Decoder_ReadPropertiesMap_UnableToDeserialize, e);
}
}
