public void Write(ArchiveListing listing, out ArchiveListingBlockInfo[] blocksInfo, out ArchiveListingEntryInfoV2[] entriesInfoV2)
{
using (MemoryStream ms = new MemoryStream(32768))
{
int blockNumber = 0, unpackedBlockOffset = 0;
entriesInfoV2 = new ArchiveListingEntryInfoV2[listing.Count];
List <ArchiveListingBlockInfo> blocks = new List <ArchiveListingBlockInfo>(128);
using (FormattingStreamWriter sw = new FormattingStreamWriter(ms, Encoding.ASCII, 4096, true, CultureInfo.InvariantCulture))
{
sw.AutoFlush = true;
for (int i = 0; i < listing.Count; i++)
{
ArchiveEntry entry = listing[i];
ArchiveListingEntryInfoV2 info = new ArchiveListingEntryInfoV2 {
BlockNumber = (short)(ms.Position / 8192)
};
info.Flag = (info.BlockNumber % 2 != 0);
entriesInfoV2[i] = info;
if (blockNumber != info.BlockNumber)
{
int blockSize = (int)(ms.Position - unpackedBlockOffset);
ms.Position = unpackedBlockOffset;
ArchiveListingBlockInfo block = new ArchiveListingBlockInfo {
Offset = (int)_output.Position, UncompressedSize = blockSize
};
block.CompressedSize = ZLibHelper.Compress(ms, _output, block.UncompressedSize);
blocks.Add(block);
blockNumber++;
unpackedBlockOffset = (int)ms.Position;
sw.Write("{0:x}:{1:x}:{2:x}:{3}\0", entry.Sector, entry.UncompressedSize, entry.Size, entry.Name);
}
else if (i == listing.Count - 1)
{
info.Offset = (short)(ms.Position - unpackedBlockOffset);
sw.Write("{0:x}:{1:x}:{2:x}:{3}\0end\0", entry.Sector, entry.UncompressedSize, entry.Size, entry.Name);
int blockSize = (int)(ms.Position - unpackedBlockOffset);
ms.Position = unpackedBlockOffset;
ArchiveListingBlockInfo block = new ArchiveListingBlockInfo {
Offset = (int)_output.Position, UncompressedSize = blockSize
};
block.CompressedSize = ZLibHelper.Compress(ms, _output, block.UncompressedSize);
blocks.Add(block);
}
else
{
info.Offset = (short)(ms.Position - unpackedBlockOffset);
sw.Write("{0:x}:{1:x}:{2:x}:{3}\0", entry.Sector, entry.UncompressedSize, entry.Size, entry.Name);
}
}
}
blocksInfo = blocks.ToArray();
}
}
public void OnWritingCompleted(ArchiveEntry entry, MemoryStream ms, bool?compression)
{
ms.Position = 0;
int compressedSize = 0;
int uncompressedSize = (int)ms.Length;
byte[] copyBuff = new byte[Math.Min(uncompressedSize, 32 * 1024)];
try
{
bool compress = uncompressedSize > 256 && (compression ?? entry.IsCompressed);
if (compress)
{
using (SafeUnmanagedArray buff = new SafeUnmanagedArray(uncompressedSize + 256))
using (UnmanagedMemoryStream buffStream = buff.OpenStream(FileAccess.ReadWrite))
{
compressedSize = ZLibHelper.Compress(ms, buffStream, uncompressedSize);
if (uncompressedSize - compressedSize > 256)
{
using (Stream output = OpenOrAppendBinary(entry, compressedSize))
{
buffStream.Position = 0;
buffStream.CopyToStream(output, compressedSize, copyBuff);
}
return;
}
}
}
ms.Position = 0;
compressedSize = uncompressedSize;
using (Stream output = OpenOrAppendBinary(entry, uncompressedSize))
ms.CopyToStream(output, uncompressedSize, copyBuff);
}
finally
{
entry.Size = compressedSize;
entry.UncompressedSize = uncompressedSize;
}
}
