コード例 #1
0
        /// <summary>
        /// Attempts to read a record from file,
        /// returns null upon reaching end of file
        /// </summary>
        /// <param name="fs">file stream to read from</param>
        /// <param name="offset">offset to begin from</param>
        /// <returns>A new record or null</returns>
        public Record ReadRecord(FileStream fs)
        {
            byte[] rawHeader = new byte[HEADER_SIZE];
            int    count     = fs.Read(rawHeader, 0, HEADER_SIZE);

            if (count == 0)
            {
                return(null);
            }
            else if (count < 16)
            {
                throw new FormatException("Unexpected file size.");
            }
            bytesRead += count;

            RecordHeader header = new RecordHeader(rawHeader);

            byte[] data = new byte[header.Size];
            count = fs.Read(data, 0, header.Size);
            if (count < header.Size)
            {
                throw new Exception("Unexpected file size.");
            }
            bytesRead += count;

            return(factory.ConstructRecord(header, data));
        }