/// <summary>
/// Tries to extracts the original filename for the OLE object out of the ObjectReplacement file
/// </summary>
/// <param name="zipEntry"></param>
/// <returns></returns>
internal static string GetFileNameFromObjectReplacementFile(SharpCompress.Archives.IArchiveEntry zipEntry)
{
try
{
using (var zipEntryStream = zipEntry.OpenEntryStream())
using (var zipEntryMemoryStream = new MemoryStream())
{
zipEntryStream.CopyTo(zipEntryMemoryStream);
zipEntryMemoryStream.Position = 0x4470;
using (var binaryReader = new BinaryReader(zipEntryMemoryStream))
{
while (binaryReader.BaseStream.Position != binaryReader.BaseStream.Length)
{
var value = binaryReader.ReadUInt16();
// We have found the start position from where we are going to read
// the original filename
if (value != 0x8000 || binaryReader.PeekChar() != 0x46)
{
continue;
}
// Skip the peeked char
zipEntryMemoryStream.Position += 2;
// Read until we find the next 0x46 value
while (binaryReader.BaseStream.Position != binaryReader.BaseStream.Length)
{
value = binaryReader.ReadUInt16();
if (value != 0x46)
{
continue;
}
// Skip the next 6 bytes
binaryReader.ReadBytes(6);
// Get the length of name string
var length = binaryReader.ReadUInt16();
// Skip the next 2 bytes
zipEntryMemoryStream.Position += 2;
// Read the filename bytes
var fileNameBytes = binaryReader.ReadBytes(length);
var fileName = Encoding.Unicode.GetString(fileNameBytes);
fileName = fileName.Replace("\0", string.Empty);
return(fileName);
}
}
}
}
}
catch
{
return(null);
}
return(null);
}
public CompressedPage(SharpCompress.Archives.IArchiveEntry Entry)
{
//this.Entry = Entry;
Cache = new MemoryStreamCache()
{
MemoryStreamProvider = async(th) =>
{
using var s = Entry.OpenEntryStream();
return(await th.GetMemoryStreamAsync(s));
}
};
}
public PageCompress(SharpCompress.Archives.IArchiveEntry entry)
{
Entry = entry;
}
public PageCompressed(SharpCompress.Archives.IArchiveEntry Entry)
{
this.Entry = Entry;
}
public Entry(SharpCompress.Archives.IArchiveEntry archiveEntry)
{
this.archiveEntry = archiveEntry;
}
