/// <summary>
/// Reads a file structure from an open stream.
/// </summary>
/// <param name="stream">Stream to read from.</param>
/// <returns>File structure populated from the stream.</returns>
public static FileStructure Read(Stream stream)
{
FileStructure fs = new FileStructure();
using (NonClosingStreamWrapper wrapper = new NonClosingStreamWrapper(stream))
using (BinaryReader reader = new BinaryReader(wrapper))
{
fs.FileFormat = FileStructure.ReadFileFormat(reader);
if (FileFormat.Unknown != fs.FileFormat)
{
fs.embeddedFileSizes = FileStructure.ReadEmbeddedFileSizes(reader);
// Remember the data stream offset, which is right after the embedded files have been written.
fs.dataStreamOffset = stream.Position;
foreach (long size in fs.embeddedFileSizes)
{
fs.dataStreamOffset += size;
}
}
}
fs.stream = stream;
return(fs);
}
/// <summary>
/// Reads a file structure from an open stream.
/// </summary>
/// <param name="stream">Stream to read from.</param>
/// <returns>File structure populated from the stream.</returns>
public static FileStructure Read(Stream stream)
{
var fs = new FileStructure();
using (var reader = new BinaryReader(stream, Encoding.UTF8, true))
{
fs.FileFormat = FileStructure.ReadFileFormat(reader);
if (fs.FileFormat != FileFormat.Unknown)
{
fs.embeddedFileSizes = FileStructure.ReadEmbeddedFileSizes(reader);
// Remember the data stream offset, which is right after the embedded files have been written.
fs.dataStreamOffset = stream.Position;
foreach (long size in fs.embeddedFileSizes)
{
fs.dataStreamOffset += size;
}
}
}
fs.stream = stream;
return(fs);
}
/// <summary>
/// Probes a stream to determine the file format.
/// </summary>
/// <param name="stream">Stream to test.</param>
/// <returns>The file format.</returns>
public static FileFormat TestFileFormat(Stream stream)
{
FileFormat format = FileFormat.Unknown;
long position = stream.Position;
try
{
using (var reader = new BinaryReader(stream, Encoding.UTF8, true))
{
format = FileStructure.ReadFileFormat(reader);
}
}
finally
{
stream.Seek(position, SeekOrigin.Begin);
}
return(format);
}
/// <summary>
/// Probes a stream to determine the file format.
/// </summary>
/// <param name="stream">Stream to test.</param>
/// <returns>The file format.</returns>
public static FileFormat TestFileFormat(Stream stream)
{
FileFormat format = FileFormat.Unknown;
long position = stream.Position;
try
{
using (NonClosingStreamWrapper wrapper = new NonClosingStreamWrapper(stream))
using (BinaryReader reader = new BinaryReader(wrapper))
{
format = FileStructure.ReadFileFormat(reader);
}
}
finally
{
stream.Seek(position, SeekOrigin.Begin);
}
return(format);
}