/// <summary>
/// Reads the header data and sets the ContentData Property to the correct content.
/// </summary>
/// <returns>A valid instance of the Headerfile.</returns>
protected NdfHeader ReadHeader()
{
var header = new NdfHeader();
using (var ms = new MemoryStream(FileData))
{
ms.Seek(12, SeekOrigin.Begin);
var buffer = new byte[4];
ms.Read(buffer, 0, buffer.Length);
header.IsCompressedBody = BitConverter.ToInt32(buffer, 0) == 128;
ms.Read(buffer, 0, 4);
header.FileSizeUncompressedMinusE0 = BitConverter.ToInt32(buffer, 0);
ms.Seek(12, SeekOrigin.Current);
ms.Read(buffer, 0, 4);
header.FileSizeUncompressed = BitConverter.ToInt32(buffer, 0);
ms.Seek(4, SeekOrigin.Current);
if (header.IsCompressedBody)
{
ms.Read(buffer, 0, 4);
header.UncompressedContentSize = BitConverter.ToInt32(buffer, 0);
}
buffer = new byte[FileData.Length - ms.Position];
ms.Read(buffer, 0, buffer.Length);
if (header.IsCompressedBody)
{
ContentData = Compressor.Decomp(buffer);
}
else
{
ContentData = buffer;
}
}
return(header);
}
/// <summary>
/// Reads the header data of the compiled Ndf binary.
/// </summary>
/// <returns>A valid instance of the Headerfile.</returns>
protected NdfHeader ReadHeader(Stream ms)
{
var header = new NdfHeader();
var buffer = new byte[4];
ms.Read(buffer, 0, buffer.Length);
if (BitConverter.ToUInt32(buffer, 0) != 809981253)
{
throw new InvalidDataException("No EUG0 found on top of this file!");
}
ms.Read(buffer, 0, buffer.Length);
if (BitConverter.ToUInt32(buffer, 0) != 0)
{
throw new InvalidDataException("Bytes between EUG0 and CNDF have to be 0");
}
ms.Read(buffer, 0, buffer.Length);
if (BitConverter.ToUInt32(buffer, 0) != 1178881603)
{
throw new InvalidDataException("No CNDF (Compiled NDF)!");
}
ms.Read(buffer, 0, buffer.Length);
header.IsCompressedBody = BitConverter.ToInt32(buffer, 0) == 128;
buffer = new byte[8];
ms.Read(buffer, 0, buffer.Length);
header.FooterOffset = BitConverter.ToUInt64(buffer, 0);
ms.Read(buffer, 0, buffer.Length);
header.HeaderSize = BitConverter.ToUInt64(buffer, 0);
ms.Read(buffer, 0, buffer.Length);
header.FullFileSizeUncomp = BitConverter.ToUInt64(buffer, 0);
return(header);
}
/// <summary>
/// Reads the footer data which is the Ndfbin Dictionary.
/// </summary>
/// <returns></returns>
protected NdfFooter ReadFooter(Stream ms, NdfHeader head)
{
var footer = new NdfFooter();
ms.Seek((long)head.FooterOffset, SeekOrigin.Begin);
var dwdBuffer = new byte[4];
var qwdbuffer = new byte[8];
ms.Read(dwdBuffer, 0, dwdBuffer.Length);
if (BitConverter.ToUInt32(dwdBuffer, 0) != 809717588)
{
throw new InvalidDataException("Footer doesnt start with TOC0");
}
ms.Read(dwdBuffer, 0, dwdBuffer.Length);
uint footerEntryCount = BitConverter.ToUInt32(dwdBuffer, 0);
for (int i = 0; i < footerEntryCount; i++)
{
var entry = new NdfFooterEntry();
ms.Read(qwdbuffer, 0, qwdbuffer.Length);
entry.Name = Encoding.ASCII.GetString(qwdbuffer).TrimEnd('\0');
ms.Read(qwdbuffer, 0, qwdbuffer.Length);
entry.Offset = BitConverter.ToInt64(qwdbuffer, 0);
ms.Read(qwdbuffer, 0, qwdbuffer.Length);
entry.Size = BitConverter.ToInt64(qwdbuffer, 0);
footer.Entries.Add(entry);
}
return(footer);
}
