public XlsStream(XlsHeader hdr, uint startSector)
{
m_file = hdr.FileStream;
m_fat = hdr.FAT;
m_hdr = hdr;
m_startSector = startSector;
}
/// <summary>
/// Creates Root Directory catalog from XlsHeader
/// </summary>
/// <param name="hdr">XlsHeader object</param>
public XlsRootDirectory(XlsHeader hdr)
{
XlsStream stream = new XlsStream(hdr, hdr.RootDirectoryEntryStart);
byte[] array = stream.ReadStream();
List<XlsDirectoryEntry> entries = new List<XlsDirectoryEntry>();
for (int i = 0; i < array.Length; i += XlsDirectoryEntry.Length)
{
byte[] tmp = new byte[XlsDirectoryEntry.Length];
Buffer.BlockCopy(array, i, tmp, 0, tmp.Length);
entries.Add(new XlsDirectoryEntry(tmp));
}
m_entries = entries;
for (int i = 0; i < entries.Count; i++)
{
XlsDirectoryEntry entry = entries[i];
if (m_root == null && entry.EntryType == STGTY.STGTY_ROOT)
{
m_root = entry;
}
if (entry.ChildSid != (uint)FATMARKERS.FAT_FreeSpace)
{
entry.Child = entries[(int)entry.ChildSid];
}
if (entry.LeftSiblingSid != (uint)FATMARKERS.FAT_FreeSpace)
{
entry.LeftSibling = entries[(int)entry.LeftSiblingSid];
}
if (entry.RightSiblingSid != (uint)FATMARKERS.FAT_FreeSpace)
{
entry.RightSibling = entries[(int)entry.RightSiblingSid];
}
}
}
/// <summary>
/// Constructs FAT table from list of sectors
/// </summary>
/// <param name="hdr">XlsHeader</param>
/// <param name="sectors">Sectors list</param>
public XlsFat(XlsHeader hdr, List<uint> sectors)
{
m_hdr = hdr;
m_sectors_for_fat = sectors.Count;
uint prevSector = 0;
int sectorSize = hdr.SectorSize;
byte[] buff = new byte[sectorSize];
Stream file = hdr.FileStream;
using (MemoryStream ms = new MemoryStream(sectorSize * m_sectors_for_fat))
{
lock (file)
{
for (int i = 0; i < sectors.Count; i++)
{
uint sector = sectors[i];
if (prevSector == 0 || (sector - prevSector) != 1)
{
file.Seek((sector + 1) * sectorSize, SeekOrigin.Begin);
}
prevSector = sector;
file.Read(buff, 0, sectorSize);
ms.Write(buff, 0, sectorSize);
}
}
ms.Seek(0, SeekOrigin.Begin);
BinaryReader rd = new BinaryReader(ms);
m_sectors = (int)ms.Length / 4;
m_fat = new List<uint>(m_sectors);
for (int i = 0; i < m_sectors; i++)
{
m_fat.Add(rd.ReadUInt32());
}
rd.Close();
ms.Close();
}
}
/// <summary>
/// Reads Excel header from Stream
/// </summary>
/// <param name="file">Stream with Excel file</param>
/// <returns>XlsHeader representing specified file</returns>
public static XlsHeader ReadHeader(Stream file)
{
XlsHeader hdr = new XlsHeader(file);
lock (file)
{
file.Seek(0, SeekOrigin.Begin);
file.Read(hdr.m_bytes, 0, 512);
}
if (!hdr.IsSignatureValid)
{
throw new InvalidHeaderException("Invalid file signature");
}
if (hdr.ByteOrder != 0xFFFE)
{
throw new FormatException("Invalid byte order specified");
}
return hdr;
}
public XlsBiffStream(XlsHeader hdr, uint streamStart)
: base(hdr, streamStart)
{
bytes = base.ReadStream();
m_size = bytes.Length;
m_offset = 0;
}