public void Save(Stream output, IArchiveFileInfo file)
{
using var bw = new BinaryWriterX(output);
// Calculate offsets
var sizeOffset = HeaderSize;
var blockCount = file.ContentChanged ? (int)Math.Ceiling(file.FileSize / (float)_header.decompBlockSize) : _blockSizes.Count;
var dataOffset = (sizeOffset + blockCount * 4 + 0x7F) & ~0x7F;
// Chunk stream into blocks
output.Position = dataOffset;
var blockSizes = _blockSizes;
if (file.ContentChanged)
{
blockSizes = GzStream.ChunkStream(file.GetFileData().Result, output, _header.decompBlockSize, 0x80);
_header.decompSize = (int)file.FileSize;
}
else
{
_origStream.Position = 0;
_origStream.CopyTo(output);
}
// Write header
_header.blockCount = blockSizes.Count;
output.Position = 0;
bw.WriteType(_header);
// Write block sizes
bw.WriteMultiple(blockSizes);
}
public IArchiveFileInfo Load(Stream input, string fileName = null)
{
using var br = new BinaryReaderX(input, true);
// Read header
_header = br.ReadType <GzHeader>();
// Read sizes
_blockSizes = br.ReadMultiple <int>(_header.blockCount);
var blockOffsets = new int[_header.blockCount];
for (var i = 0; i < _header.blockCount; i++)
{
input.Position = (input.Position + 0x7F) & ~0x7F;
blockOffsets[i] = (int)(input.Position + 4);
input.Position += _blockSizes[i];
}
// Create file
_origStream = new SubStream(input, blockOffsets[0], input.Length - blockOffsets[0] - 4);
var fileStream = new GzStream(input, _header.decompBlockSize, _header.decompSize, blockOffsets.Zip(_blockSizes.Select(x => x - 4)).ToArray());
fileName ??= "00000000.bin";
return(new ArchiveFileInfo(fileStream, fileName));
}
