/// <summary>
/// Reads
/// <see cref="V8Commit.Entities.V8FileSystem.V8FileSystemReference"/>
/// from bytes buffer
/// </summary>
/// <param name="buffer">
/// Bytes buffer, passed by reference,
/// that contains the data to read
/// </param>
/// <param name="offset">
/// Start position to read from bytes buffer
/// </param>
/// <returns>
/// Returns
/// <see cref="V8Commit.Entities.V8FileSystem.V8FileSystemReference"/>
/// with data
/// </returns>
/// <permission cref="System.Security.PermissionSet">Everyone
/// can access this method.
/// </permission>
public V8FileSystemReference ReadFileSystemReference(byte[] buffer, Int32 offset)
{
V8FileSystemReference reference = new V8FileSystemReference();
reference.RefToHeader = BitConverter.ToInt32(buffer, offset);
reference.RefToData = BitConverter.ToInt32(buffer, offset + 4);
reference.ReservedField = BitConverter.ToInt32(buffer, offset + 8);
return reference;
}
/// <summary>
/// Writes deflated data bytes from
/// <see cref = "V8Commit.Entities.V8FileSystem.V8FileSystemReference"/>
/// file to <see cref="System.IO.MemoryStream"/>
/// </summary>
/// <param name="stream">
/// <see cref="System.IO.MemoryStream"/>, passed by reference,
/// in which data bytes will be placed
/// </param>
/// <param name="file">
/// <see cref="V8Commit.Entities.V8FileSystem.V8FileSystemReference"/>,
/// passed by reference, that contains references to file header and
/// data to read from <see cref="_reader"/>
/// </param>
/// <example> This sample shows how to use
/// the ReadV8FileRawData method from your plugin
/// <code>
///
/// using (FileV8Reader v8Reader = new FileV8Reader(Input))
/// {
/// var fileSystem = v8Reader.ReadV8FileSystem();
/// foreach (var reference in fileSystem.References)
/// {
/// using (MemoryStream stream = new MemoryStream())
/// {
/// v8Reader.ReadV8FileRawData(stream, file);
///
/// // some yours сode
///
/// }
/// }
/// }
///
/// </code>
/// </example>
/// <permission cref="System.Security.PermissionSet">Everyone
/// can access this method.
/// </permission>
public void ReadV8FileRawData(MemoryStream stream, V8FileSystemReference file)
{
Seek(file.RefToData, SeekOrigin.Begin);
using (var tmpStream = new MemoryStream(ReadBytes(ReadBlockHeader())))
{
if (file.IsInFlated)
{
using (var deflateStream = new DeflateStream(tmpStream, CompressionMode.Decompress))
{
deflateStream.CopyTo(stream);
}
}
else
{
tmpStream.CopyTo(stream);
}
stream.Seek(0, SeekOrigin.Begin);
}
}
