/// <summary>
/// 保存到文件
/// -----------------------------------------------------------------
/// BITMAP FILE FORMAT
/// 0 'B','M'
/// 2 uint count = 4 bytes
/// 6 Bitmap type :
/// 0 = int record list
/// 1 = uint bitmap
/// 2 = rec# indexes
/// 7 '0'
/// 8 uint data
/// -----------------------------------------------------------------
/// </summary>
/// <param name="bmp"></param>
/// <returns>文件中的位置</returns>
private long SaveBitmapToFile(WAHBitArray bmp)
{
long off = _lastBitmapOffset;
WAHBitArray.TYPE t;
uint[] bits = bmp.GetCompressed(out t);
byte[] b = new byte[bits.Length * 4 + 8];
// write header data
b[0] = ((byte)'B');
b[1] = ((byte)'M');
Buffer.BlockCopy(Helper.GetBytes(bits.Length, false), 0, b, 2, 4);
b[6] = (byte)t;
b[7] = (byte)(0);
for (int i = 0; i < bits.Length; i++)
{
byte[] u = Helper.GetBytes((int)bits[i], false);
Buffer.BlockCopy(u, 0, b, i * 4 + 8, 4);
}
_bitmapFileWrite.Write(b, 0, b.Length);
_lastBitmapOffset += b.Length;
return(off);
}
private void WriteFreeListBMPFile(string filename)
{
if (_freeList != null)
{
WAHBitArray.TYPE t;
uint[] ints = _freeList.GetCompressed(out t);
MemoryStream ms = new MemoryStream();
BinaryWriter bw = new BinaryWriter(ms);
bw.Write((byte)t);// write new format with the data type byte
foreach (var i in ints)
{
bw.Write(i);
}
File.WriteAllBytes(filename, ms.ToArray());
}
}
private void WriteFile()
{
lock (_lock)
{
WAHBitArray.TYPE t;
uint[] ints = _bits.GetCompressed(out t);
MemoryStream ms = new MemoryStream();
BinaryWriter bw = new BinaryWriter(ms);
bw.Write((byte)t);// write new format with the data type byte
foreach (var i in ints)
{
bw.Write(i);
}
bw.Flush();
File.WriteAllBytes(_path + _filename, ms.ToArray());
}
}
