Exemplo n.º 1
0
        public override int Serialize(TSource source, SerializationContext context)
        {
            string value = GetValue(source);

            if (value == null || (IsOptional && value == DefaultValue))
            {
                return(0);
            }

            int  charCount     = value.Length;
            uint underEstimate = (uint)charCount;

            if (charCount == 0)
            {
                int prefixLen = WritePrefix(context);
                context.WriteByte(0);
                return(prefixLen + 1);
            }
            else if (charCount <= 42)
            {
                // guaranteed to have a byte length at most 127, so single byte;
                // any text up to 42 chars will take at most 126 bytes
                context.CheckSpace((3 * charCount) + 1);
                int prefixLen = WritePrefix(context),
                    byteCount = utf8.GetBytes(value, 0, charCount, context.Workspace, 1);
                context.Workspace[0] = (byte)byteCount;
                context.WriteBlock(context.Workspace, 0, ++byteCount);
                return(prefixLen + byteCount);
            }
            else if (charCount <= 127)
            {
                // common text in many locales will /tend/ to be single-byte. We'll
                // absorb the cost of checking the actual length, since we know it
                // is only a short string.
                underEstimate = (uint)utf8.GetByteCount(value);
                if (underEstimate <= 127)
                {
                    context.CheckSpace((int)(underEstimate + 1));
                    int prefixLen = WritePrefix(context),
                        byteCount = utf8.GetBytes(value, 0, charCount, context.Workspace, 1);
                    context.Workspace[0] = (byte)byteCount;
                    context.WriteBlock(context.Workspace, 0, ++byteCount);
                    return(prefixLen + byteCount);
                }
                // note also that we update "underEstimate"; this means that even
                // if we find a 100-char string actually needs multiple bytes
                // (and so we'll use the callback below), we at least start the
                // callback with the correct length, avoiding the need to
                // encode it twice.
            }

            // when all else fails (longer strings), use a callback
            // to to a length prefix using our estimated length...
            return(WritePrefix(context)
                   + context.WriteLengthPrefixed(value, underEstimate, this));
        }
Exemplo n.º 2
0
        int ILengthProperty <string> .Serialize(string value, SerializationContext context)
        {
            context.CheckSpace(Encoding.UTF8.GetMaxByteCount(value.Length));
            int len = utf8.GetBytes(value, 0, value.Length, context.Workspace, 0);

            context.WriteBlock(context.Workspace, 0, len);
            return(len);
        }
Exemplo n.º 3
0
        public override string DeserializeImpl(TSource source, SerializationContext context)
        {
            int    len = (int)context.DecodeUInt32();
            string value;

            if (len == 0)
            {
                value = "";
            }
            else
            {
                if (len > SerializationContext.InitialBufferLength)
                {
                    context.CheckSpace(len);
                }
                context.ReadBlock(len);
                value = context.Intern(utf8.GetString(context.Workspace, 0, len));
            }
            return(value);
        }