internal Lzma2Encoder(int? threadCount, LZMA.CLzma2EncProps encoderProps)
{
mThreadCount = threadCount;
mSyncObject = new object();
mOutputHelper = new LZMA.CSeqOutStream(WriteOutputHelper);
mInputHelper = new LZMA.CSeqInStream(ReadInputHelper);
if (encoderProps != null)
{
mEncoderProps = encoderProps;
}
else
{
mEncoderProps = new LZMA.CLzma2EncProps();
mEncoderProps.Lzma2EncProps_Init();
}
StartThread("LZMA 2 Stream Buffer Thread");
}
internal PackedStream Compress(Stream inputStream, SevenZipProgressProvider progressProvider)
{
// Compression method
if (!Method.HasValue || !SevenZipMethods.Lookup.ContainsKey(Method.Value))
{
throw new SevenZipException("Undefined compression method.");
}
var MethodID = SevenZipMethods.Lookup[Method.Value];
// create compressed stream information structure
var ps = new PackedStream()
{
NumStreams = 1,
Sizes = new UInt64[1] {
0
},
CRCs = new UInt32?[1] {
null
},
Folder = new SevenZipHeader.Folder()
{
NumCoders = 1,
CodersInfo = new SevenZipHeader.CoderInfo[1]
{
new SevenZipHeader.CoderInfo()
{
Attributes = (Byte)MethodID.Raw.Length,
CodecId = MethodID.Raw.ToArray(),
NumInStreams = 1,
NumOutStreams = 1
}
},
NumInStreamsTotal = 1,
NumOutStreamsTotal = 1,
PackedIndices = new UInt64[1] {
0
},
UnPackSizes = new UInt64[1] {
0
},
UnPackCRC = 0
}
};
// remember current offsets
long outStreamStartOffset = this.stream.Position;
long inStreamStartOffset = inputStream.Position;
// encode while calculating CRCs
using (var inCRCStream = new CRCStream(inputStream))
using (var outCRCStream = new CRCStream(stream))
{
LZMA.CLzmaEnc encoder = LZMA.LzmaEnc_Create(LZMA.ISzAlloc.SmallAlloc);
LZMA.CLzmaEncProps encoderProps = LZMA.CLzmaEncProps.LzmaEncProps_Init();
LZMA.CSeqOutStream outputHelper;
LZMA.CSeqInStream inputHelper;
LZMA.SRes res = LZMA.SZ_OK;
// prepare encoder settings
res = encoder.LzmaEnc_SetProps(encoderProps);
if (res != LZMA.SZ_OK)
{
throw new SevenZipException("Error setting LZMA encoder properties.");
}
byte[] properties = new byte[LZMA.LZMA_PROPS_SIZE];
long binarySettingsSize = LZMA.LZMA_PROPS_SIZE;
res = encoder.LzmaEnc_WriteProperties(properties, ref binarySettingsSize);
if (res != LZMA.SZ_OK)
{
throw new SevenZipException("Error writing LZMA encoder properties.");
}
if (binarySettingsSize != LZMA.LZMA_PROPS_SIZE)
{
throw new NotSupportedException();
}
// read/write helpers
outputHelper = new LZMA.CSeqOutStream(
(P <byte> buf, long sz) => {
outCRCStream.Write(buf.mBuffer, buf.mOffset, checked ((int)sz));
});
inputHelper = new LZMA.CSeqInStream(
(P <byte> buf, long sz) => {
return(inCRCStream.Read(buf.mBuffer, buf.mOffset, checked ((int)sz)));
});
// encode
res = encoder.LzmaEnc_Encode(outputHelper, inputHelper, progressProvider, LZMA.ISzAlloc.SmallAlloc, LZMA.ISzAlloc.BigAlloc);
if (res != LZMA.SZ_OK)
{
throw new InvalidOperationException();
}
// cleanup
encoder.LzmaEnc_Destroy(LZMA.ISzAlloc.SmallAlloc, LZMA.ISzAlloc.BigAlloc);
// keep settings in header
ps.Folder.CodersInfo[0].Attributes |= (Byte)SevenZipHeader.CoderInfo.AttrHasAttributes;
ps.Folder.CodersInfo[0].Properties = properties.ToArray();
ps.Folder.CodersInfo[0].PropertiesSize = (UInt64)ps.Folder.CodersInfo[0].Properties.Length;
// store sizes and checksums
ps.Folder.UnPackSizes[0] = (UInt64)(inputStream.Position - inStreamStartOffset);
ps.Folder.UnPackCRC = inCRCStream.Result;
ps.Sizes[0] = (UInt64)(this.stream.Position - outStreamStartOffset);
ps.CRCs[0] = outCRCStream.Result;
// handle progress offsets (in case compressor is called multiple times, with non-solid archives for instance)
if (progressProvider != null)
{
progressProvider.IncreaseOffsetBy((long)ps.Folder.UnPackSizes[0], (long)ps.Sizes[0]);
progressProvider.SetProgress(0, 0);
}
}
return(ps);
}
internal LzmaEncoder(LZMA.CLzmaEncProps encoderProps)
{
mSyncObject = new object();
mOutputHelper = new LZMA.CSeqOutStream(WriteOutputHelper);
mInputHelper = new LZMA.CSeqInStream(ReadInputHelper);
mEncoderProps = (encoderProps != null) ? encoderProps : LZMA.CLzmaEncProps.LzmaEncProps_Init();
StartThread("LZMA Stream Buffer Thread");
}