/// <summary>解压缩数据流</summary>
/// <param name="inStream">输入流</param>
/// <param name="outStream">输出流。如果不指定，则内部实例化一个内存流</param>
/// <remarks>返回输出流，注意此时指针位于末端</remarks>
public static Stream DecompressLzma(this Stream inStream, Stream outStream = null)
{
if (outStream == null)
{
outStream = new MemoryStream();
}
// 第三个参数为true，保持数据流打开，内部不应该干涉外部，不要关闭外部的数据流
using (var stream = new LzmaStream(inStream, CompressionMode.Decompress))
{
stream.CopyTo(outStream);
stream.Close();
}
return(outStream);
}
/// <summary>压缩数据流</summary>
/// <param name="inStream">输入流</param>
/// <param name="outStream">输出流。如果不指定，则内部实例化一个内存流</param>
/// <param name="level">压缩等级</param>
/// <remarks>返回输出流，注意此时指针位于末端</remarks>
public static Stream CompressLzma(this Stream inStream, Stream outStream = null, Int32 level = 4)
{
if (outStream == null)
{
outStream = new MemoryStream();
}
// 第三个参数为true，保持数据流打开，内部不应该干涉外部，不要关闭外部的数据流
using (var stream = new LzmaStream(outStream, CompressionMode.Compress, level))
{
inStream.CopyTo(stream);
stream.Flush();
stream.Close();
}
return(outStream);
}
private void CloseWriting7Zip(ICodeProgress p = null)
{
if (_compressed)
{
_lzmaStream.Close();
}
_packStreamSize = (UInt64)_zipFs.Position - _packStreamStart;
Create7ZStructure();
byte[] newHeaderByte;
using (Stream headerMem = new MemoryStream())
{
using (BinaryWriter headerBw = new BinaryWriter(headerMem))
{
_header.WriteHeader(headerBw);
newHeaderByte = new byte[headerMem.Length];
headerMem.Position = 0;
headerMem.Read(newHeaderByte, 0, newHeaderByte.Length);
}
}
CRC mainHeadercrc = new CRC();
mainHeadercrc.Update(newHeaderByte, 0, (uint)newHeaderByte.Length);
UInt32 mainHeaderCRC = mainHeadercrc.GetDigest();
UInt64 headerpos = (UInt64)_zipFs.Position;
BinaryWriter bw = new BinaryWriter(_zipFs);
bw.Write(newHeaderByte);
_signatureHeader.WriteFinal(bw, headerpos, (ulong)newHeaderByte.Length, mainHeaderCRC);
WriteRomVault7Zip(bw, headerpos, (ulong)newHeaderByte.Length, mainHeaderCRC);
_zipFs.Flush();
_zipFs.Close();
_zipFs.Dispose();
}
private void CloseWriting7Zip()
{
if (_compressed)
{
_lzmaStream.Close();
}
_packStreamSize = (ulong)_zipFs.Position - _packStreamStart;
Create7ZStructure();
byte[] newHeaderByte;
using (Stream headerMem = new MemoryStream())
{
using (BinaryWriter headerBw = new BinaryWriter(headerMem))
{
_header.WriteHeader(headerBw);
newHeaderByte = new byte[headerMem.Length];
headerMem.Position = 0;
headerMem.Read(newHeaderByte, 0, newHeaderByte.Length);
}
}
uint mainHeaderCRC = Utils.CRC.CalculateDigest(newHeaderByte, 0, (uint)newHeaderByte.Length);
ulong headerpos = (ulong)_zipFs.Position;
BinaryWriter bw = new BinaryWriter(_zipFs);
bw.Write(newHeaderByte);
_signatureHeader.WriteFinal(bw, headerpos, (ulong)newHeaderByte.Length, mainHeaderCRC);
WriteRomVault7Zip(bw, headerpos, (ulong)newHeaderByte.Length, mainHeaderCRC);
_zipFs.Flush();
_zipFs.Close();
_zipFs.Dispose();
}
private void CloseWriting7Zip()
{
if (_compressed)
{
_lzmaStream.Close();
}
_packStreamSize = (ulong)_zipFs.Position - _packStreamStart;
Create7ZStructure();
byte[] newHeaderByte;
using (Stream headerMem = new MemoryStream())
{
using (BinaryWriter headerBw = new BinaryWriter(headerMem, Encoding.UTF8, true))
{
_header.WriteHeader(headerBw);
newHeaderByte = new byte[headerMem.Length];
headerMem.Position = 0;
headerMem.Read(newHeaderByte, 0, newHeaderByte.Length);
}
}
uint mainHeaderCRC = CRC.CalculateDigest(newHeaderByte, 0, (uint)newHeaderByte.Length);
#region Header Compression
long packedHeaderPos = _zipFs.Position;
LzmaEncoderProperties ep = new LzmaEncoderProperties(true, GetDictionarySizeFromUncompressedSize((ulong)newHeaderByte.Length), 64);
LzmaStream lzs = new LzmaStream(ep, false, _zipFs);
byte[] lzmaStreamProperties = lzs.Properties;
lzs.Write(newHeaderByte, 0, newHeaderByte.Length);
lzs.Close();
StreamsInfo streamsInfo = new StreamsInfo
{
PackPosition = (ulong)(packedHeaderPos - _baseOffset),
Folders = new[] {
new Folder {
BindPairs = new BindPair[0],
Coders = new [] {
new Coder {
Method = new byte[] { 3, 1, 1 },
NumInStreams = 1,
NumOutStreams = 1,
Properties = lzmaStreamProperties
}
},
UnpackedStreamSizes = new[] { (ulong)newHeaderByte.Length },
UnpackCRC = mainHeaderCRC
}
},
PackedStreams = new[] {
new PackedStreamInfo
{
PackedSize = (ulong)(_zipFs.Position - packedHeaderPos),
StreamPosition = 0
}
}
};
using (Stream headerMem = new MemoryStream())
{
using (BinaryWriter bw = new BinaryWriter(headerMem, Encoding.UTF8, true))
{
bw.Write((byte)HeaderProperty.kEncodedHeader);
streamsInfo.WriteHeader(bw);
newHeaderByte = new byte[headerMem.Length];
headerMem.Position = 0;
headerMem.Read(newHeaderByte, 0, newHeaderByte.Length);
}
}
mainHeaderCRC = CRC.CalculateDigest(newHeaderByte, 0, (uint)newHeaderByte.Length);
#endregion
using (BinaryWriter bw = new BinaryWriter(_zipFs, Encoding.UTF8, true))
{
ulong headerPosition = (ulong)_zipFs.Position + 32; //tzip header is 32 bytes
WriteRomVault7Zip(bw, headerPosition, (ulong)newHeaderByte.Length, mainHeaderCRC);
_zipFs.Write(newHeaderByte, 0, newHeaderByte.Length);
_signatureHeader.WriteFinal(bw, headerPosition, (ulong)newHeaderByte.Length, mainHeaderCRC);
}
_zipFs.Flush();
_zipFs.Close();
_zipFs.Dispose();
}