public IList <IArchiveFileInfo> Load(Stream input)
{
// Read header
using var headerBr = new BinaryReaderX(new Arc1CryptoStream(input, 0), true);
_header = headerBr.ReadType <Arc1Header>();
// Prepare file info stream
var infoStream = new Arc1CryptoStream(new SubStream(input, _header.entryOffset, _header.entrySize), (uint)_header.entryOffset);
using var infoBr = new BinaryReaderX(infoStream);
// Read entries
var entryCount = infoBr.ReadInt32();
var entries = infoBr.ReadMultiple <Arc1FileEntry>(entryCount);
// Add files
var result = new List <IArchiveFileInfo>();
foreach (var entry in entries)
{
infoStream.Position = entry.nameOffset;
var name = infoBr.ReadCStringASCII();
var fileStream = new SubStream(input, entry.offset, entry.size);
result.Add(new Arc1ArchiveFileInfo(fileStream, name, Path.GetExtension(name) != ".mp4", (uint)entry.offset));
}
return(result);
}
public void Save(Stream output, IList <IArchiveFileInfo> files)
{
// Calculate offsets
var dataOffset = HeaderSize;
var entryOffset = dataOffset + files.Sum(x => x.FileSize);
var stringOffset = entryOffset + 4 + files.Count * EntrySize;
var totalSize = stringOffset + files.Sum(x => x.FilePath.ToRelative().FullName.Length + 1);
// Prepare output stream
output.SetLength(totalSize);
// Write files
var dataPosition = dataOffset;
var stringPosition = stringOffset - entryOffset;
var entries = new List <Arc1FileEntry>();
foreach (var file in files.Cast <Arc1ArchiveFileInfo>())
{
// Write file data
Stream outputRegion = new SubStream(output, dataPosition, file.FileSize);
if (file.ContentChanged && file.FilePath.GetExtensionWithDot() != ".mp4")
{
outputRegion = new Arc1CryptoStream(outputRegion, (uint)dataPosition);
}
file.GetFinalStream().CopyTo(outputRegion);
// Add entry
entries.Add(new Arc1FileEntry
{
nameOffset = (int)stringPosition,
offset = dataPosition,
size = (int)file.FileSize
});
dataPosition += (int)file.FileSize;
stringPosition += file.FilePath.ToRelative().FullName.Length + 1;
}
// Write entry information
var infoStream = new Arc1CryptoStream(new SubStream(output, entryOffset, totalSize - entryOffset), (uint)entryOffset);
using var infoBw = new BinaryWriterX(infoStream);
infoBw.Write(files.Count);
infoBw.WriteMultiple(entries);
foreach (var name in files.Select(x => x.FilePath.ToRelative().FullName))
{
infoBw.WriteString(name, Encoding.ASCII, false);
}
// Write header
var headerStream = new Arc1CryptoStream(new SubStream(output, 0, HeaderSize), 0);
using var headerBw = new BinaryWriterX(headerStream);
_header.entryOffset = (int)entryOffset;
_header.entrySize = (int)(totalSize - entryOffset);
_header.fileSize = (int)totalSize;
headerBw.WriteType(_header);
}