using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using Biff8Excel.Interfaces;

namespace Biff8Excel.Records
{
    [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Auto, Pack = 1)]
    struct RecordHeader
    {
        public ushort opcode;
        public ushort length;
        public ushort textLen;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]        public byte zero;
    }

    internal class Header : IRecords
    {
        RecordHeader header;
        byte[] m_header;

        public Header()
        {
            header.opcode = 0x14;
            header.zero = 0x1;
        }

        public byte[] Head
        {
            set { m_header = value; }
        }

        public ushort TextLen
        {
            set { header.textLen = value; }
        }

        #region IRecords ³ΙΤ±

        public byte[] GetByte()
        {
            int len = 7 + m_header.Length;
            header.length = (ushort)(len - 4);
            //header.textLen = (ushort)(len - 7);

            byte[] b = new byte[len];
            Globals.GetStructToBytes(header).CopyTo(b, 0);

            m_header.CopyTo(b, 7);
            return b;
        }
        #endregion
    }
}