/// <summary>
/// Writes the contents of the archive to be generated to the stream.
/// </summary>
public void Write(Stream writeStream, bool bigEndian)
{
using var stream = new ExtendedMemoryStream();
using EndianMemoryStream endianStream = bigEndian ? (EndianMemoryStream) new BigEndianMemoryStream(stream) : new LittleEndianMemoryStream(stream);
// Precompute Offsets
var fileNameSize = Files.Sum(x => x.Name.Length) + (Files.Count);
Span <int> offsets = stackalloc int[Files.Count];
PrecomputeFileOffsets(offsets, fileNameSize);
// Texture Count
endianStream.Write <short>((short)Files.Count);
endianStream.Write((short)1);
// Texture Offsets
for (int x = 0; x < offsets.Length; x++)
{
endianStream.Write(offsets[x]);
}
// Texture Flags
for (int x = 0; x < Files.Count; x++)
{
endianStream.Write((byte)0x11);
}
// Texture Names
Span <byte> currentString = stackalloc byte[1024];
foreach (var file in Files)
{
int numEncoded = Encoding.ASCII.GetBytes(file.Name, currentString);
currentString[numEncoded] = 0x00;
stream.Write(currentString.Slice(0, numEncoded + 1));
}
// Texture Data
stream.AddPadding(FileDataAlignment);
for (int x = 0; x < Files.Count; x++)
{
stream.Write(Files[x].Data);
stream.AddPadding(FileDataAlignment);
}
writeStream.Write(stream.ToArray());
}
/// <summary>
/// Writes the contents of the archive to be generated to the stream.
/// </summary>
public void Write(Stream writeStream)
{
using var stream = new ExtendedMemoryStream();
// Number of items.
stream.Write <int>(Groups.Keys.Count);
// Number of items for each id.
foreach (var group in Groups)
{
stream.Write <byte>((byte)group.Value.Files.Count);
}
stream.AddPadding(0x00, 4);
// Write first item index for each group.
ushort totalItems = 0;
foreach (var group in Groups)
{
stream.Write <ushort>(totalItems);
totalItems += (ushort)group.Value.Files.Count;
}
// Write ID for each group.
foreach (var group in Groups)
{
stream.Write <ushort>(group.Value.Id);
}
// Write offsets for each file and pad.
int firstWriteOffset = Utilities.Utilities.RoundUp((int)stream.Position + (sizeof(int) * totalItems), 16);
int fileWriteOffset = firstWriteOffset;
foreach (var group in Groups)
{
foreach (var file in group.Value.Files)
{
stream.Write <int>(file.Data.Length <= 0 ? 0 : fileWriteOffset);
fileWriteOffset += file.Data.Length;
}
}
// Write files.
stream.Write(new byte[(int)(firstWriteOffset - stream.Position)]); // Alignment
foreach (var file in Groups.SelectMany(x => x.Value.Files))
{
stream.Write(file.Data);
}
writeStream.Write(stream.ToArray());
}
/// <summary>
/// Builds a virtual AFS based upon a supplied base AFS file.
/// </summary>
public VirtualAfs Build(string afsFilePath, int alignment = 2048)
{
// Get entries from original AFS file.
var entries = GetEntriesFromFile(afsFilePath);
var files = new Dictionary <int, VirtualFile>(entries.Length);
// Get Original File List and Copy to New Header.
var maxCustomFileId = _customFiles.Count > 0 ? _customFiles.Max(x => x.Key) + 1 : 0;
var numFiles = Math.Max(maxCustomFileId, entries.Length);
var newEntries = new AfsFileEntry[numFiles];
var headerLength = Utilities.RoundUp(sizeof(AfsHeader) + (sizeof(AfsFileEntry) * entries.Length), alignment);
// Create new Virtual AFS Header
for (int x = 0; x < entries.Length; x++)
{
var offset = x > 0 ? Utilities.RoundUp(newEntries[x - 1].Offset + newEntries[x - 1].Length, alignment) : entries[0].Offset;
int length = 0;
if (_customFiles.ContainsKey(x))
{
length = _customFiles[x].Length;
files[offset] = _customFiles[x];
}
else
{
length = entries[x].Length;
files[offset] = new VirtualFile(entries[x], afsFilePath);
}
newEntries[x] = new AfsFileEntry(offset, length);
}
var lastEntry = newEntries.Last();
var fileSize = Utilities.RoundUp(lastEntry.Offset + lastEntry.Length, alignment);
// Make Header
using var memStream = new ExtendedMemoryStream(headerLength);
memStream.Append(AfsHeader.FromNumberOfFiles(newEntries.Length));
memStream.Append(newEntries);
memStream.Append(new AfsFileEntry(0, 0));
memStream.AddPadding(alignment);
return(new VirtualAfs(memStream.ToArray(), files, alignment, fileSize));
}