public Int32 ReadInt32()
{
_stream.Read(_buffer, _pos, 4);
_pos += 4;
Int32 v = BitConverter.ToInt32(_buffer, 0);
if (_reverse)
{
v = BinaryPrimitives.ReverseEndianness(v);
}
return(v);
}
public void Test_RESIZE_MINISTREAM_NO_TRANSITION()
{
CompoundFile cf = null;
byte[] b = Helpers.GetBuffer(1024 * 2);
cf = new CompoundFile(CFSVersion.Ver_3, CFSConfiguration.Default);
cf.RootStorage.AddStream("MiniStream").SetData(b);
cf.Save("$Test_RESIZE_MINISTREAM.cfs");
cf.Close();
cf = new CompoundFile("$Test_RESIZE_MINISTREAM.cfs", CFSUpdateMode.Update,
CFSConfiguration.SectorRecycle | CFSConfiguration.EraseFreeSectors);
CFStream item = cf.RootStorage.GetStream("MiniStream");
item.Resize(item.Size / 2);
cf.Commit();
cf.Close();
cf = new CompoundFile("$Test_RESIZE_MINISTREAM.cfs", CFSUpdateMode.ReadOnly, CFSConfiguration.Default);
CFStream st = cf.RootStorage.GetStream("MiniStream");
Assert.IsNotNull(st);
Assert.IsTrue(st.Size == 1024);
byte[] buffer = new byte[1024];
st.Read(buffer, 0, 1024);
Assert.IsTrue(Helpers.CompareBuffer(b, buffer, 1024));
cf.Close();
}
public void Test_RESIZE_STREAM_TRANSITION_TO_NORMAL()
{
CompoundFile cf = null;
byte[] b = Helpers.GetBuffer(1024 * 2, 0xAA); //2MB buffer
cf = new CompoundFile(CFSVersion.Ver_3, CFSConfiguration.Default);
cf.RootStorage.AddStream("AStream").SetData(b);
cf.Save("$Test_RESIZE_STREAM_TRANSITION_TO_NORMAL.cfs");
cf.Save("$Test_RESIZE_STREAM_TRANSITION_TO_NORMAL2.cfs");
cf.Close();
cf = new CompoundFile("$Test_RESIZE_STREAM_TRANSITION_TO_NORMAL.cfs", CFSUpdateMode.Update,
CFSConfiguration.SectorRecycle | CFSConfiguration.EraseFreeSectors);
CFStream item = cf.RootStorage.GetStream("AStream");
item.Resize(5000);
cf.Commit();
cf.Close();
cf = new CompoundFile("$Test_RESIZE_STREAM_TRANSITION_TO_NORMAL.cfs", CFSUpdateMode.ReadOnly,
CFSConfiguration.Default);
item = cf.RootStorage.GetStream("AStream");
Assert.IsTrue(item != null);
Assert.IsTrue(item.Size == 5000);
byte[] buffer = new byte[2048];
item.Read(buffer, 0, 2048);
Assert.IsTrue(Helpers.CompareBuffer(b, buffer));
}
//Gets a raw byte-stream from storage
public byte[] GetFile(CFItem Itm)
{
byte[] buf = new byte[Itm.Size];
CFStream Strm = (CFStream)Itm;
Strm.Read(buf, 0, (int)Itm.Size);
return(buf);
}
//Reads a single binary integer from storage (Version Info)
int ReadIntBinary(CFItem Itm)
{
CFStream Strm = (CFStream)Itm;
byte[] buf = new byte[4];
int n = Strm.Read(buf, 0, 4);
return(BitConverter.ToInt32(buf, 0));
}
//Gets a BIFF file from storage
public BIFFFile GetBIFF(CFItem Itm)
{
byte[] buf = new byte[Itm.Size];
CFStream Strm = (CFStream)Itm;
Strm.Read(buf, 0, (int)Itm.Size);
return(new BIFFFile(buf));
}
static byte[] DecompressStream(CFStream sm, uint offset = 0)
{
try {
var cd = new byte[sm.Size - offset];
sm.Read(cd, offset, cd.Length);
return(CompoundDocumentCompression.DecompressPart(cd));
} catch (Exception ex) {
throw new ApplicationException($"Error while decompressing stream '{sm.Name}': {ex.Message}", ex);
}
}
/// <summary>
/// Returns true if the stream is compressed wit LW77.
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static bool IsCompressedWithLW77(CFStream stream)
{
byte[] array = new byte[5];
if (stream.Size > 5L)
{
stream.Read(array, 0L, 5);
return(array[4] != 1);
}
return(false);
}
//Reads a unicode text file from storage (Table Name / Author etc.)
string ReadTextFileUnicode(long Sz, CFItem Itm)
{
string S = "";
CFStream Strm = (CFStream)Itm;
byte[] buf = new byte[Sz];
int n = Strm.Read(buf, 0, (int)Sz);
S = Encoding.Unicode.GetString(buf, 0, (int)Sz);
return(S);
}
//Gets a BIFF file from storage
public BIFFFile GetBIFFFile(string Nm)
{
IList <CFItem> Lst = CF.GetAllNamedEntries(Nm);
foreach (CFItem Itm in Lst)
{
byte[] buf = new byte[Itm.Size];
CFStream Strm = (CFStream)Itm;
Strm.Read(buf, 0, (int)Itm.Size);
return(new BIFFFile(buf));
}
return(null);
}
public override int Read(byte[] buffer, int offset, int count)
{
if (offset != 0)
{
throw new ArgumentException($"Offset must be 0");
}
if (count + Position > Length)
{
count = (int)(Length - Position);
}
var n = _stream.Read(buffer, Position, count);
Position += n;
return(n);
}
/// <summary>
/// Indicates if a Compound File stream is an image.
/// </summary>
/// <param name="ms"></param>
/// <returns>0: Unknown - 1: BMP - 2: JPEG</returns>
public static int VerifyIfImage(CFStream ms)
{
byte[] buffer = new byte[20];
ms.Read(buffer, 0L, 20);
if (buffer[10] == 0xFF & buffer[11] == 0xD8 & buffer[12] == 0xFF & buffer[13] == 0xE0)
{
// It's BMP
return(1);
}
else if (buffer[8] == 0xFF & buffer[9] == 0xD8 & buffer[10] == 0xFF & buffer[11] == 0xE0)
{
// It's JPEG
return(2);
}
else if ((buffer[10] == 0x42) & (buffer[11] == 0x4D))
{
// It's BMP
return(1);
}
return(0);
}
/// <summary>
/// Convert Compound File stream into memory stream.
/// </summary>
/// <param name="st"></param>
/// <returns></returns>
public static MemoryStream CFtoMStream(CFStream st)
{
byte[] buffer = new byte[st.Size];
st.Read(buffer, 0L, (int)st.Size);
return(new MemoryStream(buffer));
}
