private uint _standardStreamMinBytes; //in bytes
#endregion Fields
#region Constructors
/// <summary>
/// Initializes a new, blank, Ole2Document object.
/// </summary>
public Ole2Document()
{
SetDefaults();
_header = new Header(this);
_msat = new Msat(this);
_sat = new Sat(this);
_ssat = new Ssat(this);
_directory = new Directory(this);
_streams = new Streams(this);
_streams.AddNamed(new Bytes(), Directory.RootName);
}
/// <summary>
/// Loads this Ole2Document object from the provided stream (e.g. a FileStream to load
/// from a File). This is only preliminarily supported and tested for Excel
/// files.
/// </summary>
/// <param name="stream">Stream to load the document from.</param>
public void Load(System.IO.Stream stream)
{
if (stream.Length == 0)
{
throw new Exception("No data (or zero-length) found!");
}
if (stream.Length < 512)
{
throw new Exception(string.Format("File length {0} < 512 bytes", stream.Length));
}
byte[] head = new byte[512];
stream.Read(head, 0, 512);
bool isLE = false;
if (head[28] == 254 && head[29] == 255)
{
isLE = true;
}
if (!isLE)
{
throw new NotSupportedException("File is not Little-Endian");
}
_isLittleEndian = isLE;
ushort sectorSize = BitConverter.ToUInt16(MidByteArray(head, 30, 2), 0);
if (sectorSize < 7 || sectorSize > 32)
{
throw new Exception(string.Format("Invalid Sector Size [{0}] (should be 7 <= sectorSize <= 32", sectorSize));
}
_sectorSize = sectorSize;
ushort shortSectorSize = BitConverter.ToUInt16(MidByteArray(head, 32, 2), 0);
if (shortSectorSize > sectorSize)
{
throw new Exception(
string.Format("Invalid Short Sector Size [{0}] (should be < sectorSize; {1})", shortSectorSize, sectorSize));
}
_shortSectorSize = shortSectorSize;
//if (readError) ExitFunction;
uint satSectorCount = BitConverter.ToUInt32(MidByteArray(head, 44, 4), 0);
if (satSectorCount < 0)
{
throw new Exception(string.Format("Invalid SAT Sector Count [{0}] (should be > 0)", satSectorCount));
}
int dirSID0 = BitConverter.ToInt32(MidByteArray(head, 48, 4), 0);
if (dirSID0 < 0)
{
throw new Exception(string.Format("Invalid Directory SID0 [{0}] (should be > 0)", dirSID0));
}
uint minStandardStreamSize = BitConverter.ToUInt32(MidByteArray(head, 56, 4), 0);
if ((minStandardStreamSize < (Math.Pow(2, sectorSize))) || (minStandardStreamSize % (Math.Pow(2, sectorSize)) > 0))
{
throw new Exception(string.Format("Invalid MinStdStreamSize [{0}] (should be multiple of (2^SectorSize)", minStandardStreamSize));
}
_standardStreamMinBytes = minStandardStreamSize;
int ssatSID0 = BitConverter.ToInt32(MidByteArray(head, 60, 4), 0);
uint ssatSectorCount = BitConverter.ToUInt32(MidByteArray(head, 64, 4), 0);
if (ssatSID0 < 0 && ssatSID0 != -2)
{
throw new Exception(string.Format("Invalid SSAT SID0 [{0}] (must be >=0 or -2", ssatSID0));
}
if (ssatSectorCount > 0 && ssatSID0 < 0)
{
throw new Exception(
string.Format("Invalid SSAT SID0 [{0}] (must be >=0 when SSAT Sector Count > 0)", ssatSID0));
}
if (ssatSectorCount < 0)
{
throw new Exception(string.Format("Invalid SSAT Sector Count [{0}] (must be >= 0)", ssatSectorCount));
}
int msatSID0 = BitConverter.ToInt32(MidByteArray(head, 68, 4), 0);
if (msatSID0 < 1 && msatSID0 != -2)
{
throw new Exception(string.Format("Invalid MSAT SID0 [{0}]", msatSID0));
}
uint msatSectorCount = BitConverter.ToUInt32(MidByteArray(head, 72, 4), 0);
if (msatSectorCount < 0)
{
throw new Exception(string.Format("Invalid MSAT Sector Count [{0}]", msatSectorCount));
}
else if (msatSectorCount == 0 && msatSID0 != -2)
{
throw new Exception(string.Format("Invalid MSAT SID0 [{0}] (should be -2)", msatSID0));
}
int i = 0;
int k = ((int)Math.Pow(2, sectorSize) / 4) - 1;
int[] msat = new int[108 + (k * msatSectorCount) + 1]; //add 1 compared to VBScript version due to C#/VBS array declaration diff
for (int j = 0; j < 109; j++)
{
msat[j] = BitConverter.ToInt32(MidByteArray(head, 76 + (j * 4), 4), 0);
}
int msatSidNext = msatSID0;
while (i < msatSectorCount)
{
Bytes sector = GetSector(stream, sectorSize, msatSidNext);
if (sector.Length == 0)
{
throw new Exception(string.Format("MSAT SID Chain broken - SID [{0}] not found / EOF reached", msatSidNext));
}
for (int j = 0; j < k; j++)
{
msat[109 + (i * k) + j] = BitConverter.ToInt32(sector.Get(j * 4, 4).ByteArray, 0);
}
msatSidNext = BitConverter.ToInt32(sector.Get(k * 4, 4).ByteArray, 0);
i++;
}
//if (re) Exit Function;
//Find number of Sectors in SAT --> i
i = msat.Length;
while (msat[i - 1] < 0)
{
i--;
}
//Size and fill SAT SID array
int[] sat = new int[(uint)(i * (Math.Pow(2, sectorSize) / 4))];
int m = (int)(Math.Pow(2, sectorSize) / 4);
for (int j = 0; j < i; j++)
{
Bytes sector = GetSector(stream, sectorSize, msat[j]);
if (sector.Length == 0)
{
throw new Exception(string.Format("SAT SID Chain broken - SAT Sector SID{0} not found / EOF reached", msat[j]));
}
for (k = 0; k < m; k++)
{
sat[(j * m) + k] = BitConverter.ToInt32(sector.Get(k * 4, 4).ByteArray, 0);
}
}
//Size and fill SSAT SID array
i = 0;
int ssatSidNext = ssatSID0;
// m = (int) (Math.Pow(2, sectorSize) / 4);
//Dictionary<int, int> ssat = new Dictionary<int, int>();
int[] ssat = new int[(ssatSectorCount + 1) * m];
while (ssatSidNext > -2)
{
Bytes sector = GetSector(stream, sectorSize, ssatSidNext);
if (sector.Length == 0)
{
throw new Exception(string.Format("SSAT Sector SID{0} not found", ssatSidNext));
}
for (int j = 0; j < m; j++)
{
ssat[(i * m) + j] = BitConverter.ToInt32(sector.Get(j * 4, 4).ByteArray, 0);
}
ssatSidNext = sat[ssatSidNext];
i++;
}
if (i < ssatSectorCount)
{
throw new Exception(string.Format("SSAT Sector chain broken: {0} found, header indicates {1}", i, ssatSectorCount));
}
//Size and fill Directory byte array array
int dirSectorCount = 0;
int dirSidNext = dirSID0;
m = (int)(Math.Pow(2, sectorSize) / 128);
Dictionary <int, byte[]> dir = new Dictionary <int, byte[]>();
while (dirSidNext > -2)
{
Bytes sector = GetSector(stream, sectorSize, dirSidNext);
if (sector.Length == 0)
{
throw new Exception(string.Format("Directory Sector SID{0} not found", dirSidNext));
}
for (int j = 0; j < m; j++)
{
dir[(dirSectorCount * m) + j] = sector.Get(j * 128, 128).ByteArray;
}
dirSidNext = sat[dirSidNext];
dirSectorCount++;
}
for (i = 0; i < dir.Count; i++)
{
byte[] dirEntry = dir[i];
int nameLength = BitConverter.ToInt16(MidByteArray(dirEntry, 64, 2), 0);
byte[] docStreamName = MidByteArray(dirEntry, 0, nameLength);
bool overwrite = false;
if (Bytes.AreEqual(docStreamName, Directory.RootName))
{
overwrite = true;
}
Bytes docStream =
GetStream(stream, i, dir, sectorSize, sat, shortSectorSize, ssat, minStandardStreamSize);
if (docStreamName.Length == 0 && docStream.Length == 0)
{
continue; //don't add streams for directory padding entries
}
Streams.AddNamed(docStream, docStreamName, overwrite);
}
}