public XlsBiffStream(XlsHeader hdr, uint streamStart, bool isMini, XlsRootDirectory rootDir)
: base(hdr, streamStart, isMini, rootDir)
{
bytes = base.ReadStream();
m_size = bytes.Length;
m_offset = 0;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="bytes">byte array representing current object</param>
/// <param name="header"></param>
public XlsDirectoryEntry(byte[] bytes, XlsHeader header)
{
if (bytes.Length < Length)
{
throw new BiffRecordException(Errors.ErrorDirectoryEntryArray);
}
m_bytes = bytes;
m_header = header;
}
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);
}
/// <summary>
/// Constructs FAT table from list of sectors
/// </summary>
/// <param name="hdr">XlsHeader</param>
/// <param name="sectors">Sectors list</param>
/// <param name="sizeOfSector"></param>
/// <param name="isMini"></param>
/// <param name="rootDir"></param>
public XlsFat(XlsHeader hdr, List <uint> sectors, int sizeOfSector, bool isMini, XlsRootDirectory rootDir)
{
m_isMini = isMini;
m_rootDir = rootDir;
m_hdr = hdr;
m_sectors_for_fat = sectors.Count;
sizeOfSector = hdr.SectorSize;
uint sector = 0, prevSector = 0;
//calc offset of stream . If mini stream then find mini stream container stream
//long offset = 0;
//if (rootDir != null)
// offset = isMini ? (hdr.MiniFatFirstSector + 1) * hdr.SectorSize : 0;
byte[] buff = new byte[sizeOfSector];
Stream file = hdr.FileStream;
using (MemoryStream ms = new MemoryStream(sizeOfSector * m_sectors_for_fat))
{
lock (file)
{
for (int i = 0; i < sectors.Count; i++)
{
sector = sectors[i];
if (prevSector == 0 || (sector - prevSector) != 1)
{
file.Seek((sector + 1) * sizeOfSector, SeekOrigin.Begin);
}
prevSector = sector;
file.Read(buff, 0, sizeOfSector);
ms.Write(buff, 0, sizeOfSector);
}
}
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.Dispose();
ms.Dispose();
}
}
/// <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 HeaderException(Errors.ErrorHeaderSignature);
}
if (hdr.ByteOrder != 0xFFFE)
{
throw new FormatException(Errors.ErrorHeaderOrder);
}
return(hdr);
}
/// <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, false, null);
byte[] array = stream.ReadStream();
byte[] tmp;
XlsDirectoryEntry entry;
List <XlsDirectoryEntry> entries = new List <XlsDirectoryEntry>();
for (int i = 0; i < array.Length; i += XlsDirectoryEntry.Length)
{
tmp = new byte[XlsDirectoryEntry.Length];
Buffer.BlockCopy(array, i, tmp, 0, tmp.Length);
entries.Add(new XlsDirectoryEntry(tmp, hdr));
}
m_entries = entries;
for (int i = 0; i < entries.Count; i++)
{
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];
}
}
stream.CalculateMiniFat(this);
}