public static bool TryFormat(this DateTimeOffset value, Span <byte> buffer, out int bytesWritten, TextFormat format = default(TextFormat), EncodingData encoding = default(EncodingData))
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'R' || format.Symbol == 'O' || format.Symbol == 'G');
switch (format.Symbol)
{
case 'R':
if (encoding.IsInvariantUtf16) // TODO: there are many checks like this one in the code. They need to also verify that the UTF8 branch is invariant.
{
return(TryFormatDateTimeRfc1123(value.UtcDateTime, buffer, out bytesWritten, EncodingData.InvariantUtf16));
}
else
{
return(TryFormatDateTimeRfc1123(value.UtcDateTime, buffer, out bytesWritten, EncodingData.InvariantUtf8));
}
case 'O':
if (encoding.IsInvariantUtf16)
{
return(TryFormatDateTimeFormatO(value.UtcDateTime, false, buffer, out bytesWritten, EncodingData.InvariantUtf16));
}
else
{
return(TryFormatDateTimeFormatO(value.UtcDateTime, false, buffer, out bytesWritten, EncodingData.InvariantUtf8));
}
case 'G':
return(TryFormatDateTimeFormatG(value.DateTime, buffer, out bytesWritten, encoding));
default:
throw new NotImplementedException();
}
}
/// <summary>
/// Parses an unsigned 64-bit integer from a location within a UTF-8 byte array buffer.
/// </summary>
/// <param name="utf8Text">The UTF-8 buffer, passed as a byte array.</param>
/// <param name="index">The index location of the value to be parsed within the buffer.</param>
/// <param name="value">The parsed value.</param>
/// <param name="bytesConsumed">The length (in bytes) of the unparsed value within the UTF-8 buffer.</param>
/// <returns>True if parsing is successful; false otherwise.</returns>
public static bool TryParse(byte[] utf8Text, int index, out byte value, out int bytesConsumed)
{
Precondition.Require(utf8Text.Length > 0);
value = 0;
bytesConsumed = 0;
for (int byteIndex = index; byteIndex < utf8Text.Length; byteIndex++) // loop through the byte array
{
byte nextByte = utf8Text[byteIndex];
if (nextByte < '0' || nextByte > '9') // if the next character is not a digit
{
if (bytesConsumed == 0) // check to see if we've processed any digits at all
{
value = default(byte); // if we haven't, set value to 0 and return false
return(false);
}
else
{
return(true); // otherwise return true
}
}
byte candidate = (byte)(value * 10); // left shift the value
candidate += (byte)(nextByte - '0'); // parse the current digit to a byte and add it to the temporary value
if (candidate >= value) // if it was a digit 0-9, this should be true
{
value = candidate;
}
else // this should never happen, but just in case
{
return(true);
}
bytesConsumed++; // increment the number of bytes consumed, then loop
}
return(true);
}
public static bool TryFormatNumber(double value, bool isSingle, Span<byte> buffer, out int bytesWritten, TextFormat format, EncodingData encoding)
{
Precondition.Require(format.Symbol == 'G' || format.Symbol == 'E' || format.Symbol == 'F');
bytesWritten = 0;
int written;
if (Double.IsNaN(value))
{
return encoding.TryEncode(EncodingData.Symbol.NaN, buffer, out bytesWritten);
}
if (Double.IsInfinity(value))
{
if (Double.IsNegativeInfinity(value))
{
if (!encoding.TryEncode(EncodingData.Symbol.MinusSign, buffer, out written))
{
bytesWritten = 0;
return false;
}
bytesWritten += written;
}
if (!encoding.TryEncode(EncodingData.Symbol.InfinitySign, buffer.Slice(bytesWritten), out written))
{
bytesWritten = 0;
return false;
}
bytesWritten += written;
return true;
}
// TODO: the lines below need to be replaced with properly implemented algorithm
// the problem is the algorithm is complex, so I am commiting a stub for now
var hack = value.ToString(format.Symbol.ToString());
return encoding.TextEncoder.TryEncodeString(hack, buffer, out bytesWritten);
}
public static bool TryParse(Utf8String text, out uint value, out int bytesConsumed)
{
Precondition.Require(text.Length > 0);
value = 0;
bytesConsumed = 0;
for (int byteIndex = 0; byteIndex < text.Length; byteIndex++)
{
byte nextByte = (byte)text[byteIndex];
if (nextByte < '0' || nextByte > '9')
{
if (bytesConsumed == 0)
{
value = default(uint);
return(false);
}
else
{
return(true);
}
}
uint candidate = value * 10;
candidate += (uint)nextByte - '0';
if (candidate >= value)
{
value = candidate;
}
else
{
return(true);
}
bytesConsumed++;
}
return(true);
}
public static bool TryFormat(this DateTimeOffset value, Span <byte> buffer, Format.Parsed format, EncodingData formattingData, out int bytesWritten)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'R' || format.Symbol == 'O' || format.Symbol == 'G');
switch (format.Symbol)
{
case 'R':
if (formattingData.IsUtf16)
{
return(TryFormatDateTimeRfc1123(value.UtcDateTime, buffer, EncodingData.InvariantUtf16, out bytesWritten));
}
else
{
return(TryFormatDateTimeRfc1123(value.UtcDateTime, buffer, EncodingData.InvariantUtf8, out bytesWritten));
}
case 'O':
if (formattingData.IsUtf16)
{
return(TryFormatDateTimeFormatO(value.UtcDateTime, false, buffer, EncodingData.InvariantUtf16, out bytesWritten));
}
else
{
return(TryFormatDateTimeFormatO(value.UtcDateTime, false, buffer, EncodingData.InvariantUtf8, out bytesWritten));
}
case 'G':
return(TryFormatDateTimeFormagG(value.DateTime, buffer, formattingData, out bytesWritten));
default:
throw new NotImplementedException();
}
}
public override void Execute(ControllerContext context)
{
Precondition.Require(context, () => Error.ArgumentNull("context"));
if (context.IsChild)
{
throw Error.CannotExecuteResultInChildAction();
}
HttpResponseBase response = context.Context.Response;
response.ContentType = (String.IsNullOrEmpty(_contentType))
? _defaultContentType : _contentType;
if (_contentEncoding != null)
{
response.ContentEncoding = _contentEncoding;
}
if (_data != null)
{
using (MemoryStream ms = new MemoryStream(500))
{
using (XmlWriter writer = XmlTextWriter.Create(ms,
new XmlWriterSettings()
{
OmitXmlDeclaration = true, Indent = true,
Encoding = response.ContentEncoding
}))
{
XmlSerializer xs = new XmlSerializer(_data.GetType(), _includedTypes);
xs.Serialize(writer, _data);
}
ms.WriteTo(response.OutputStream);
}
}
}
/// <summary>
/// Executes the specified <paramref name="action"/> against the connection.
/// </summary>
/// <param name="connection">The connection instance.</param>
/// <param name="action">An action to execute.</param>
public static void Execute(this IDbConnection connection, Action <IDbConnection> action)
{
Precondition.Require(connection, () => Error.ArgumentNull("connection"));
Precondition.Require(action, () => Error.ArgumentNull("action"));
ConnectionState state = connection.State;
try
{
if (state == ConnectionState.Closed)
{
connection.Open();
}
action(connection);
}
finally
{
if (state == ConnectionState.Closed)
{
connection.Close();
}
}
}
public void OnAuthorization(AuthorizationContext context)
{
Precondition.Require(context, () => Error.ArgumentNull("context"));
if (Validate(context.HttpContext))
{
HttpCachePolicyBase cachePolicy = context.HttpContext.Response.Cache;
cachePolicy.SetProxyMaxAge(new TimeSpan(0));
cachePolicy.AddValidationCallback(CacheValidationHandler, null);
}
else
{
context.Cancel = true;
string url = CreateRedirectionUrl(context);
if (RedirectAllowed(context, url))
{
context.Result = new RedirectResult(url);
}
else
{
context.Result = DefaultResult;
}
}
}
// TODO: implement a real pool
// Maybe the pool should support renting Span<byte> instead of byte[]. This would make it cheaper to have many small buffers.
public static byte[] RentBuffer(int minSize)
{
Precondition.Require(minSize > 0);
return(new byte[minSize]);
}
public void SetControllerFactory(IControllerFactory factory)
{
Precondition.Require(factory, () => Error.ArgumentNull("factory"));
_factoryThunk = () => factory;
}
public bool TryWriteDigit(ulong digit, Span <byte> buffer, out int bytesWritten)
{
Precondition.Require(digit < 10);
return(TryWriteDigitOrSymbol(digit, buffer, out bytesWritten));
}
/// <summary>
/// When overridden in a derived class, disposes the specified
/// <see cref="Radischevo.Wahha.Data.IDbDataProvider"/>.
/// </summary>
/// <param name="provider">The provider instance to dispose.</param>
public virtual void DisposeProvider(IDbDataProvider provider)
{
Precondition.Require(provider, () => Error.ArgumentNull("provider"));
provider.Dispose();
}
public ValidationHelper(ViewContext context)
{
Precondition.Require(context, () => Error.ArgumentNull("context"));
_context = context;
}
public HttpServerUtilityWrapper(HttpServerUtility server)
{
Precondition.Require(server, () => Error.ArgumentNull("server"));
_server = server;
}
public ModelBinderAttribute(Type type)
{
Precondition.Require(type, () => Error.ArgumentNull("type"));
_type = type;
}
public void Add(ModelBinderProvider provider)
{
Precondition.Require(provider, () => Error.ArgumentNull("provider"));
_providers.Add(provider);
}
/// <summary>
/// Creates a <see cref="Radischevo.Wahha.Data.DbCommandResult"/> wrapper for
/// the specified <paramref name="command"/>.
/// </summary>
/// <param name="provider">An instance of data provider being extended.</param>
/// <param name="command">The object, describing the command to execute.</param>
public static DbCommandResult Execute(this IDbDataProvider provider, DbCommandDescriptor command)
{
Precondition.Require(provider, () => Error.ArgumentNull("provider"));
return(new DbCommandResult(provider, command));
}
public static bool TryFormat(this Guid value, Span <byte> buffer, out int bytesWritten, TextFormat format = default(TextFormat), TextEncoder encoder = null)
{
if (format.IsDefault)
{
format.Symbol = 'G';
}
Precondition.Require(format.Symbol == 'G' || format.Symbol == 'D' || format.Symbol == 'N' || format.Symbol == 'B' || format.Symbol == 'P');
encoder = encoder == null ? TextEncoder.Utf8 : encoder;
bool dash = true;
char tail = '\0';
bytesWritten = 0;
switch (format.Symbol)
{
case 'D':
case 'G':
break;
case 'N':
dash = false;
break;
case 'B':
if (!TryWriteChar('{', buffer, ref bytesWritten, encoder))
{
return(false);
}
tail = '}';
break;
case 'P':
if (!TryWriteChar('(', buffer, ref bytesWritten, encoder))
{
return(false);
}
tail = ')';
break;
default:
Precondition.Require(false); // how did we get here?
break;
}
var byteFormat = new TextFormat('x', 2);
unsafe
{
byte *bytes = (byte *)&value;
if (!TryWriteByte(bytes[3], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[2], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[1], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[0], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, ref bytesWritten, encoder))
{
return(false);
}
}
if (!TryWriteByte(bytes[5], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[4], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, ref bytesWritten, encoder))
{
return(false);
}
}
if (!TryWriteByte(bytes[7], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[6], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, ref bytesWritten, encoder))
{
return(false);
}
}
if (!TryWriteByte(bytes[8], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[9], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (dash)
{
if (!TryWriteChar('-', buffer, ref bytesWritten, encoder))
{
return(false);
}
}
if (!TryWriteByte(bytes[10], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[11], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[12], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[13], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[14], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
if (!TryWriteByte(bytes[15], buffer, ref bytesWritten, byteFormat, encoder))
{
return(false);
}
}
if (tail != '\0')
{
if (!TryWriteChar(tail, buffer, ref bytesWritten, encoder))
{
return(false);
}
}
return(true);
}
public MultiSelectList(IEnumerable <ListItem> items)
{
Precondition.Require(items, () => Error.ArgumentNull("items"));
_listItems = items;
}
private static bool TryFormatHexadecimalInvariantCultureUtf8(ulong value, Span <byte> buffer, out int bytesWritten, ParsedFormat format)
{
Precondition.Require(format.Symbol == 'X' || format.Symbol == 'x');
byte firstDigitOffset = (byte)'0';
byte firstHexCharOffset = format.Symbol == 'X' ? (byte)'A' : (byte)'a';
firstHexCharOffset -= 10;
// Count amount of hex digits
var hexDigitsCount = 1;
ulong valueToCount = value;
if (valueToCount > 0xFFFFFFFF)
{
hexDigitsCount += 8;
valueToCount >>= 0x20;
}
if (valueToCount > 0xFFFF)
{
hexDigitsCount += 4;
valueToCount >>= 0x10;
}
if (valueToCount > 0xFF)
{
hexDigitsCount += 2;
valueToCount >>= 0x8;
}
if (valueToCount > 0xF)
{
hexDigitsCount++;
}
var bytesCount = hexDigitsCount;
// Count leading zeros
var leadingZerosCount = format.HasPrecision ? format.Precision - hexDigitsCount : 0;
bytesCount += leadingZerosCount > 0 ? leadingZerosCount : 0;
if (bytesCount > buffer.Length)
{
bytesWritten = 0;
return(false);
}
var index = bytesCount;
while (hexDigitsCount-- > 0)
{
byte digit = (byte)(value & 0xF);
value >>= 0x4;
digit += digit < 10 ? firstDigitOffset : firstHexCharOffset;
buffer[--index] = digit;
}
// Write leading zeros if any
while (leadingZerosCount-- > 0)
{
buffer[--index] = firstDigitOffset;
}
bytesWritten = bytesCount;
return(true);
}
public ContentSegment(IEnumerable <PathSubsegment> segments)
{
Precondition.Require(segments, () => Error.ArgumentNull("segments"));
_segments = new List <PathSubsegment>(segments);
}
public VariableSubsegment(string variableName)
: base("variable")
{
Precondition.Require(variableName, () => Error.ArgumentNull("variableName"));
_variableName = variableName;
}
internal static ResultContext GetResultContext(ResultContext context)
{
Precondition.Require(context, () => Error.ArgumentNull("context"));
return(context);
}
public HttpRequestWrapper(HttpRequest request)
{
Precondition.Require(request, () => Error.ArgumentNull("request"));
_request = request;
}
// TODO: this whole routine is too slow. It does div and mod twice, which are both costly (especially that some JITs cannot optimize it).
// It does it twice to avoid reversing the formatted buffer, which can be tricky given it should handle arbitrary cultures.
// One optimization I thought we could do is to do div/mod once and store digits in a temp buffer (but that would allocate). Modification to the idea would be to store the digits in a local struct
// Another idea possibly worth tying would be to special case cultures that have constant digit size, and go back to the format + reverse buffer approach.
private static bool TryFormatDecimal(ulong value, Span <byte> buffer, out int bytesWritten, ParsedFormat format, SymbolTable symbolTable)
{
char symbol = char.ToUpperInvariant(format.Symbol);
Precondition.Require(symbol == 'D' || format.Symbol == 'G' || format.Symbol == 'N');
// Reverse value on decimal basis, count digits and trailing zeros before the decimal separator
ulong reversedValueExceptFirst = 0;
var digitsCount = 1;
var trailingZerosCount = 0;
// We reverse the digits in numeric form because reversing encoded digits is hard and/or costly.
// If value contains 20 digits, its reversed value will not fit into ulong size.
// So reverse it till last digit (reversedValueExceptFirst will have all the digits except the first one).
while (value >= 10)
{
var digit = value % 10UL;
value = value / 10UL;
if (reversedValueExceptFirst == 0 && digit == 0)
{
trailingZerosCount++;
}
else
{
reversedValueExceptFirst = reversedValueExceptFirst * 10UL + digit;
digitsCount++;
}
}
bytesWritten = 0;
int digitBytes;
// If format is D and precision is greater than digitsCount + trailingZerosCount, append leading zeros
if (symbol == 'D' && format.HasPrecision)
{
var leadingZerosCount = format.Precision - digitsCount - trailingZerosCount;
while (leadingZerosCount-- > 0)
{
if (!symbolTable.TryEncode(SymbolTable.Symbol.D0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
}
// Append first digit
if (!symbolTable.TryEncode((SymbolTable.Symbol)value, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsCount--;
if (symbol == 'N')
{
const int GroupSize = 3;
// Count amount of digits before first group separator. It will be reset to groupSize every time digitsLeftInGroup == zero
var digitsLeftInGroup = (digitsCount + trailingZerosCount) % GroupSize;
if (digitsLeftInGroup == 0)
{
if (digitsCount + trailingZerosCount > 0)
{
// There is a new group immediately after the first digit
if (!symbolTable.TryEncode(SymbolTable.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
digitsLeftInGroup = GroupSize;
}
// Append digits
while (reversedValueExceptFirst > 0)
{
if (digitsLeftInGroup == 0)
{
if (!symbolTable.TryEncode(SymbolTable.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup = GroupSize;
}
var nextDigit = reversedValueExceptFirst % 10UL;
reversedValueExceptFirst = reversedValueExceptFirst / 10UL;
if (!symbolTable.TryEncode((SymbolTable.Symbol)nextDigit, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup--;
}
// Append trailing zeros if any
while (trailingZerosCount-- > 0)
{
if (digitsLeftInGroup == 0)
{
if (!symbolTable.TryEncode(SymbolTable.Symbol.GroupSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup = GroupSize;
}
if (!symbolTable.TryEncode(SymbolTable.Symbol.D0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
digitsLeftInGroup--;
}
}
else
{
while (reversedValueExceptFirst > 0)
{
var bufferSlice = buffer.Slice(bytesWritten);
var nextDigit = reversedValueExceptFirst % 10UL;
reversedValueExceptFirst = reversedValueExceptFirst / 10UL;
if (!symbolTable.TryEncode((SymbolTable.Symbol)nextDigit, bufferSlice, out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
// Append trailing zeros if any
while (trailingZerosCount-- > 0)
{
if (!symbolTable.TryEncode(SymbolTable.Symbol.D0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
}
// If format is N and precision is not defined or is greater than zero, append trailing zeros after decimal point
if (symbol == 'N')
{
int trailingZerosAfterDecimalCount = format.HasPrecision ? format.Precision : 2;
if (trailingZerosAfterDecimalCount > 0)
{
if (!symbolTable.TryEncode(SymbolTable.Symbol.DecimalSeparator, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
while (trailingZerosAfterDecimalCount-- > 0)
{
if (!symbolTable.TryEncode(SymbolTable.Symbol.D0, buffer.Slice(bytesWritten), out digitBytes))
{
bytesWritten = 0;
return(false);
}
bytesWritten += digitBytes;
}
}
}
return(true);
}
public static void ReturnBuffer(ref byte[] buffer)
{
Precondition.Require(buffer != null);
buffer = null;
}
protected DataAnnotationsModelValidator(ValidationAttribute attribute)
: base()
{
Precondition.Require(attribute, () => Error.ArgumentNull("attribute"));
_attribute = attribute;
}
public IAsyncResult BeginInvokeAction(ControllerContext context,
string actionName, AsyncCallback callback, object state,
IDictionary <string, object> values)
{
Precondition.Require(context, () => Error.ArgumentNull("context"));
Precondition.Defined(actionName, () => Error.ArgumentNull("actionName"));
ControllerDescriptor controller = GetControllerDescriptor(context);
ActionDescriptor action = controller.FindAction(context, actionName);
if (action == null)
{
return(ActionNotFound(callback, state));
}
context.Parameters.Merge(GetParameterValues(context, action))
.Merge(values);
ActionFilterInfo filters = GetFilters(context, action);
Action continuation = null;
BeginInvokeDelegate beginDelegate = delegate(AsyncCallback asyncCallback, object asyncState) {
try
{
AuthorizationContext authContext = InvokeAuthorizationFilters(context, action, filters.AuthorizationFilters);
if (authContext.Cancel)
{
continuation = () => InvokeActionResult(context, authContext.Result ?? EmptyResult.Instance);
}
else
{
if (context.Controller.ValidateRequest)
{
ValidateRequest(context.Context.Request);
}
IAsyncResult asyncResult = BeginInvokeActionFilters(context, action,
filters.ActionFilters, context.Parameters, asyncCallback, asyncState);
continuation = () => {
ActionExecutedContext postContext = EndInvokeActionFilters(asyncResult);
InvokeActionResultFilters(context, filters.ResultFilters, postContext.Result);
};
return(asyncResult);
}
}
catch (ThreadAbortException)
{
throw;
}
catch (Exception ex)
{
ExceptionContext ctx = InvokeExceptionFilters(context, ex, filters.ExceptionFilters);
if (!ctx.Handled)
{
throw;
}
continuation = () => InvokeActionResult(context, ctx.Result);
}
return(MakeSynchronousAsyncResult(asyncCallback, asyncState));
};
EndInvokeDelegate <bool> endDelegate = delegate(IAsyncResult asyncResult) {
try
{
continuation();
}
catch (ThreadAbortException)
{
throw;
}
catch (Exception ex)
{
ExceptionContext ctx = InvokeExceptionFilters(context, ex, filters.ExceptionFilters);
if (!ctx.Handled)
{
throw;
}
InvokeActionResult(context, ctx.Result);
}
return(true);
};
return(AsyncResultWrapper.Begin(callback, state, beginDelegate, endDelegate, _invokeTag));
}
private static bool TryFormatNumber(double value, bool isSingle, Span <byte> buffer, out int bytesWritten, StandardFormat format = default, SymbolTable symbolTable = null)
{
Precondition.Require(format.Symbol == 'G' || format.Symbol == 'E' || format.Symbol == 'F');
symbolTable = symbolTable ?? SymbolTable.InvariantUtf8;
bytesWritten = 0;
int written;
if (Double.IsNaN(value))
{
return(symbolTable.TryEncode(SymbolTable.Symbol.NaN, buffer, out bytesWritten));
}
if (Double.IsInfinity(value))
{
if (Double.IsNegativeInfinity(value))
{
if (!symbolTable.TryEncode(SymbolTable.Symbol.MinusSign, buffer, out written))
{
bytesWritten = 0;
return(false);
}
bytesWritten += written;
}
if (!symbolTable.TryEncode(SymbolTable.Symbol.InfinitySign, buffer.Slice(bytesWritten), out written))
{
bytesWritten = 0;
return(false);
}
bytesWritten += written;
return(true);
}
// TODO: the lines below need to be replaced with properly implemented algorithm
// the problem is the algorithm is complex, so I am commiting a stub for now
var hack = value.ToString(format.Symbol.ToString());
var utf16Bytes = hack.AsSpan().AsBytes();
if (symbolTable == SymbolTable.InvariantUtf8)
{
var status = Encodings.Utf16.ToUtf8(utf16Bytes, buffer, out int consumed, out bytesWritten);
return(status == OperationStatus.Done);
}
else if (symbolTable == SymbolTable.InvariantUtf16)
{
bytesWritten = utf16Bytes.Length;
if (utf16Bytes.TryCopyTo(buffer))
{
return(true);
}
bytesWritten = 0;
return(false);
}
else
{
// TODO: This is currently pretty expensive. Can this be done more efficiently?
// Note: removing the hack might solve this problem a very different way.
var status = Encodings.Utf16.ToUtf8Length(utf16Bytes, out int needed);
if (status != OperationStatus.Done)
{
bytesWritten = 0;
return(false);
}
Span <byte> temp = stackalloc byte[needed];
status = Encodings.Utf16.ToUtf8(utf16Bytes, temp, out int consumed, out written);
if (status != OperationStatus.Done)
{
bytesWritten = 0;
return(false);
}
return(symbolTable.TryEncode(temp, buffer, out consumed, out bytesWritten));
}
}
public BlockRenderer(HttpContextBase context)
{
Precondition.Require(context, () => Error.ArgumentNull("context"));
_context = context;
}