public XlsStream(XlsHeader hdr, uint startSector, bool isMini, XlsRootDirectory rootDir) {
m_fileStream=hdr.FileStream;
m_fat=hdr.FAT;
m_hdr=hdr;
m_startSector=startSector;
m_isMini=isMini;
m_rootDir=rootDir;
CalculateMiniFat(rootDir);
}
public void CalculateMiniFat(XlsRootDirectory rootDir) {
m_minifat=m_hdr.GetMiniFAT(rootDir);
}
public void CalculateMiniFat(XlsRootDirectory rootDir)
{
m_minifat = m_hdr.GetMiniFAT(rootDir);
}
/// <summary>
/// Returns mini FAT table
/// </summary>
public XlsFat GetMiniFAT(XlsRootDirectory rootDir) {
if (m_minifat!=null)
return m_minifat;
//if no minifat then return null
if (MiniFatSectorCount==0) //TODO(fanfeilong): ||MiniSectorSize==0xFFFFFFFE
return null;
var sectors=new List<uint>(MiniFatSectorCount);
//find the sector where the minifat starts
uint miniFatStartSector=BitConverter.ToUInt32(m_bytes, 0x3c);
sectors.Add(miniFatStartSector);
//lock (m_file)
//{
// //work out the file location of minifat then read each sector
// var miniFatStartOffset = (miniFatStartSector + 1)*SectorSize;
// var miniFatSize = MiniFatSectorCount * SectorSize;
// m_file.Seek(miniFatStartOffset, SeekOrigin.Begin);
// byte[] sectorBuff = new byte[SectorSize];
// for (var i = 0; i < MiniFatSectorCount; i += SectorSize)
// {
// m_file.Read(sectorBuff, 0, 4);
// var secId = BitConverter.ToUInt32(sectorBuff, 0);
// sectors.Add(secId);
// }
//}
m_minifat=new XlsFat(this, sectors, MiniSectorSize, true, rootDir);
return m_minifat;
}