/// <summary>
/// Reads <see cref="V8Commit.Entities.V8FileSystem.V8ContainerHeader"/>
/// from <see cref="_reader"/>
/// </summary>
/// <returns>
/// Returns <see cref="V8Commit.Entities.V8FileSystem.V8ContainerHeader"/>
/// with data
/// </returns>
/// <permission cref="System.Security.PermissionSet">Only
/// this class can access this method.
/// </permission>
private V8ContainerHeader ReadContainerHeader()
{
V8ContainerHeader container = new V8ContainerHeader();
container.RefToNextPage = _reader.ReadInt32();
container.PageSize = _reader.ReadInt32();
container.PagesCount = _reader.ReadInt32();
container.ReservedField = _reader.ReadInt32();
return(container);
}
/// <summary>
/// Checks the stream matching 1CV8 file
/// </summary>
/// <param name="stream">
/// <see cref="System.IO.MemoryStream"/>, passed by reference,
/// that contains the data to be checked
/// </param>
/// <returns>
/// Returns the result of the comparison
/// <see cref="System.IO.MemoryStream"/> with file description 1CV8
/// </returns>
/// <example> This sample shows how to use
/// the IsV8FileSystem method from your plugin
/// <code>
///
/// using (FileV8Reader v8Reader = new FileV8Reader(Input))
/// {
/// var fileSystem = v8Reader.ReadV8FileSystem();
/// foreach (var reference in fileSystem.References)
/// {
/// v8Reader.Seek(reference.RefToData, SeekOrigin.Begin);
/// using (MemoryStream memStream = new MemoryStream())
/// {
/// using (MemoryStream memReader = new MemoryStream(v8Reader.ReadBytes(v8Reader.ReadBlockHeader())))
/// {
/// if (reference.IsInFlated)
/// {
/// using (DeflateStream deflateStream = new DeflateStream(memReader, CompressionMode.Decompress))
/// {
/// deflateStream.CopyTo(memStream);
/// }
/// }
/// else
/// {
/// memReader.CopyTo(memStream);
/// }
/// }
///
/// if (v8Reader.IsV8FileSystem(memStream))
/// {
/// // some yours сode
/// }
/// else
/// {
/// // some yours сode
/// }
/// }
/// }
/// }
///
/// </code>
/// </example>
/// <permission cref="System.Security.PermissionSet">Everyone
/// can access this method.
/// </permission>
public bool IsV8FileSystem(MemoryStream stream)
{
if (stream.Capacity < V8ContainerHeader.Size() + V8BlockHeader.Size())
{
return(false);
}
stream.Seek(0, SeekOrigin.Begin);
using (FileV8Reader tmpV8Reader = new FileV8Reader(new BinaryReader(stream, Encoding.Default, true)))
{
try
{
tmpV8Reader.ReadContainerHeader();
tmpV8Reader.ReadBlockHeader();
}
catch
{
return(false);
}
}
return(true);
}
