public Delegate GenerateDecoder(Type type, Func <Type, Delegate> recurse)
{
return(new Func <DecodeBuffer, UInt16>(input =>
{
return (UInt16)UnsignedVlq.Decode(input);
}));
}
public Delegate GenerateDecoder(Type type, Func <Type, Delegate> recurse)
{
// Get deserializer for sub items
var valueDecoder = recurse(type.GenericTypeArguments[0]);
return(new Func <DecodeBuffer, IList>(input =>
{
// Read header
var header = UnsignedVlq.Decode(input);
// Handle nulls
if (header == 0)
{
return null;
}
// Determine length
var count = (Int32)header - 1;
// Instantiate list
var output = (IList)Activator.CreateInstance(type); //typeof(List<>).MakeGenericType(type.GenericTypeArguments)
// Deserialize until we reach length limit
for (var i = 0; i < count; i++)
{
// Deserialize element
var element = valueDecoder.DynamicInvokeTransparent(input);
// Add to output
output.Add(element);
}
return output;
}));
}
public override Object Decode(DecodeBuffer input)
{
var v = UnsignedVlq.Decode(input);
if (IsNullable)
{
if (v == 0)
{
return(null);
}
v--;
}
v *= Increment;
v += Minimum;
return(Convert.ChangeType(v, UnderlyingType));
}
public override Object Decode(DecodeBuffer input)
{
// Decode header
var header = UnsignedVlq.Decode(input);
// Handle nulls
if (IsNullable)
{
if (header == 0)
{
return(null);
}
header--;
}
// Decode value
return(Encoding.UTF8.GetString(input.Underlying, input.GetIncrementOffset((Int32)header), (Int32)header));
}
public Delegate GenerateDecoder(Type type, Func <Type, Delegate> recurse)
{
return(new Func <DecodeBuffer, String>(input =>
{
// Decode header
var header = UnsignedVlq.Decode(input);
// Handle nulls
if (header == 0)
{
return null;
}
// Determine length
var length = (Int32)header - 1;
// Decode value
return Encoding.UTF8.GetString(input.Underlying, input.GetIncrementOffset(length), length);
}));
}
public override Object Decode(DecodeBuffer input)
{
#if DEBUG
if (null == Records)
{
throw new InvalidOperationException("Coder has not yet been prepared.");
}
#endif
// Read the length header
var header = (Int32)UnsignedVlq.Decode(input);
// Handle nulls
if (IsNullable)
{
if (header == 0)
{
return(null);
}
header--;
}
// Instantiate output
var output = Activator.CreateInstance(UnderlyingType);
// Extract an inner buffer so that if fields are added to the class in the future we ignore them, being backwards compatible
var innerInput = input.Extract(header);
// Isolate bytes for body
foreach (var record in Records)
{
// Deserialize value
var v = record.Coder.Decode(innerInput);
// Set it on property
record.Field.SetValue(output, v);
}
return(output);
}
public Delegate GenerateDecoder(Type type, Func <Type, Delegate> recurse)
{
// Get deserializer for sub items
var keyDecoder = recurse(type.GenericTypeArguments[0]);
var valueDecoder = recurse(type.GenericTypeArguments[1]);
return(new Func <DecodeBuffer, IDictionary>(input =>
{
// Read header
var header = UnsignedVlq.Decode(input);
if (header == 0)
{
return null;
}
// Get count
var count = (Int32)header - 1;
// Instantiate dictionary
var output = (IDictionary)Activator.CreateInstance(type);
// Loop through input buffer until depleted
for (var i = 0; i < count; i++)
{
// Deserialize key
var keyValue = keyDecoder.DynamicInvokeTransparent(input);
// Deserialize value
var valueValue = valueDecoder.DynamicInvokeTransparent(input);
// Add to output
output[keyValue] = valueValue;
}
return output;
}));
}
public Delegate GenerateDecoder(Type type, Func <Type, Delegate> recurse)
{
// Get deserializer for sub items
var valueDecoder = recurse(type.GetElementType());
return(new Func <DecodeBuffer, Array>(input =>
{
var header = UnsignedVlq.Decode(input);
if (header == 0)
{
return null;
}
// Determine length
var length = (Int32)header - 1;
// Instantiate list
var container = (IList)Activator.CreateInstance(typeof(List <>).MakeGenericType(type.GetElementType()));
// Deserialize until we reach length limit
for (var i = 0; i < length; i++)
{
// Deserialize element
var element = valueDecoder.DynamicInvokeTransparent(input);
// Add to output
container.Add(element);
}
// Convert to array and return
var output = Array.CreateInstance(type.GetElementType(), container.Count);
container.CopyTo(output, 0);
return output;
}));
}
public Delegate GenerateDecoder(Type type, Func <Type, Delegate> recurse)
{
var records = new Record[Byte.MaxValue];
// Find all properties decorated with LightWeightProperty attribute
var maxIndex = -1;
foreach (var property in type.GetRuntimeFields())
{
// Get property attribute which tells us the properties' index
var attribute = (LightWeightPropertyAttribute)property.GetCustomAttribute(typeof(LightWeightPropertyAttribute), false);
if (null == attribute)
{
// No attribute found, skip
continue;
}
// Check for duplicate index
if (null != records[attribute.Index])
{
throw new DuplicateIndexException($"The index {attribute.Index} is already used and cannot be reused.");
}
// Note the max index used
if (attribute.Index > maxIndex)
{
maxIndex = attribute.Index;
}
// Find/create encoder
var decoder = recurse(property.FieldType);
// Find floor, if any
var transformations = property.GetCustomAttributes <TransformationAttribute>(true).ToArray();
// Store property in lookup
records[attribute.Index] = new Record()
{
Field = property,
Coder = decoder,
Transformations = transformations
};
}
// Check that no indexes have been missed
for (var i = 0; i < maxIndex; i++)
{
if (null == records[i])
{
throw new MissingIndexException($"Indexes must not be skipped, however missing index {i}.");
}
}
return(new Func <DecodeBuffer, Object>(input =>
{
// Read the length header
var header = (Int32)UnsignedVlq.Decode(input);
// Handle nulls
if (header == 0)
{
return null;
}
// Determine length
var length = header - 1;
// Instantiate output
var output = Activator.CreateInstance(type);
// Extract an inner buffer so that if fields are added to the class in the future we ignore them, being backwards compatible
var innerInput = input.Extract(length);
// Isolate bytes for body
for (var i = 0; i <= maxIndex; i++)
{
var record = records[i];
// Deserialize value
var v = record.Coder.DynamicInvokeTransparent(innerInput);
// Apply transformations
foreach (var transformation in record.Transformations)
{
v = transformation.RemoveEffect(v);
}
// Set it on property
record.Field.SetValue(output, v);
}
return output;
}));
}
