BplusDotNet.LinkedFile.GetChunk C# (CSharp) Method

        public byte[] GetChunk(long HeadBufferNumber)
        {
            // get the head, interpret the length
            byte buffertype;
            long nextBufferNumber;
            byte[] buffer = this.ParseBuffer(HeadBufferNumber, out buffertype, out nextBufferNumber);
            int length = BufferFile.Retrieve(buffer, 0);
            if (length<0)
            {
                throw new LinkedFileException("negative length block? must be garbage: "+length);
            }
            if (buffertype!=HEAD)
            {
                throw new LinkedFileException("first buffer not marked HEAD");
            }
            byte[] result = new byte[length];
            // read in the data from the first buffer
            int firstLength = this.buffersize-BufferFile.INTSTORAGE;
            if (firstLength>length)
            {
                firstLength = length;
            }
            Array.Copy(buffer, BufferFile.INTSTORAGE, result, 0, firstLength);
            int stored = firstLength;
            while (stored<length)
            {
                // get the next buffer
                long thisBufferNumber = nextBufferNumber;
                buffer = this.ParseBuffer(thisBufferNumber, out buffertype, out nextBufferNumber);
                int nextLength = this.buffersize;
                if (length-stored<nextLength)
                {
                    nextLength = length-stored;
                }
                Array.Copy(buffer, 0, result, stored, nextLength);
                stored += nextLength;
            }
            return result;
        }

        public object Get(string key, object defaultValue)
        {
            long map;

            if (m_tree.ContainsKey(key, out map))
            {
                return(m_archive.GetChunk(map));
            }
            return(defaultValue);
        }