diff --git a/Makefile.am b/Makefile.am
index b1af410e..77cc7c4f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -58,8 +58,8 @@ nzbget_SOURCES = \
 	daemon/frontend/LoggableFrontend.h \
 	daemon/frontend/NCursesFrontend.cpp \
 	daemon/frontend/NCursesFrontend.h \
-    daemon/main/CommandLineParser.cpp \
-    daemon/main/CommandLineParser.h \
+	daemon/main/CommandLineParser.cpp \
+	daemon/main/CommandLineParser.h \
 	daemon/main/DiskService.cpp \
 	daemon/main/DiskService.h \
 	daemon/main/Maintenance.cpp \
@@ -223,13 +223,14 @@ nzbget_SOURCES += \
 	lib/yencode/Ssse3Decoder.cpp \
 	lib/yencode/PclmulCrc.cpp \
 	lib/yencode/NeonDecoder.cpp \
-	lib/yencode/ArmCrc.cpp
+	lib/yencode/AcleCrc.cpp \
+	lib/yencode/SliceCrc.cpp
 
 lib/yencode/Sse2Decoder.$(OBJEXT) : CXXFLAGS+=$(SSE2_CXXFLAGS)
 lib/yencode/Ssse3Decoder.$(OBJEXT) : CXXFLAGS+=$(SSSE3_CXXFLAGS)
 lib/yencode/PclmulCrc.$(OBJEXT) : CXXFLAGS+=$(PCLMUL_CXXFLAGS)
 lib/yencode/NeonDecoder.$(OBJEXT) : CXXFLAGS+=$(NEON_CXXFLAGS)
-lib/yencode/ArmCrc.$(OBJEXT) : CXXFLAGS+=$(ARMCRC_CXXFLAGS)
+lib/yencode/AcleCrc.$(OBJEXT) : CXXFLAGS+=$(ACLECRC_CXXFLAGS)
 
 AM_CPPFLAGS = \
 	-I$(srcdir)/daemon/connect \
diff --git a/Makefile.in b/Makefile.in
index 27836422..ba6606be 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -315,10 +315,11 @@ am__nzbget_SOURCES_DIST = daemon/connect/Connection.cpp \
 	lib/yencode/YEncode.h lib/yencode/SimdInit.cpp \
 	lib/yencode/ScalarDecoder.cpp lib/yencode/Sse2Decoder.cpp \
 	lib/yencode/Ssse3Decoder.cpp lib/yencode/PclmulCrc.cpp \
-	lib/yencode/NeonDecoder.cpp lib/yencode/ArmCrc.cpp \
-	lib/catch/catch.h tests/suite/TestMain.cpp \
-	tests/suite/TestMain.h tests/suite/TestUtil.cpp \
-	tests/suite/TestUtil.h tests/main/CommandLineParserTest.cpp \
+	lib/yencode/NeonDecoder.cpp lib/yencode/AcleCrc.cpp \
+	lib/yencode/SliceCrc.cpp lib/catch/catch.h \
+	tests/suite/TestMain.cpp tests/suite/TestMain.h \
+	tests/suite/TestUtil.cpp tests/suite/TestUtil.h \
+	tests/main/CommandLineParserTest.cpp \
 	tests/main/OptionsTest.cpp tests/feed/FeedFilterTest.cpp \
 	tests/postprocess/DupeMatcherTest.cpp \
 	tests/postprocess/RarRenamerTest.cpp \
@@ -434,7 +435,8 @@ am_nzbget_OBJECTS = daemon/connect/Connection.$(OBJEXT) \
 	lib/yencode/Sse2Decoder.$(OBJEXT) \
 	lib/yencode/Ssse3Decoder.$(OBJEXT) \
 	lib/yencode/PclmulCrc.$(OBJEXT) \
-	lib/yencode/NeonDecoder.$(OBJEXT) lib/yencode/ArmCrc.$(OBJEXT) \
+	lib/yencode/NeonDecoder.$(OBJEXT) \
+	lib/yencode/AcleCrc.$(OBJEXT) lib/yencode/SliceCrc.$(OBJEXT) \
 	$(am__objects_2) $(am__objects_3)
 nzbget_OBJECTS = $(am_nzbget_OBJECTS)
 nzbget_LDADD = $(LDADD)
@@ -560,10 +562,10 @@ DIST_TARGETS = dist-gzip
 distuninstallcheck_listfiles = find . -type f -print
 am__distuninstallcheck_listfiles = $(distuninstallcheck_listfiles) \
   | sed 's|^\./|$(prefix)/|' | grep -v '$(infodir)/dir$$'
+ACLECRC_CXXFLAGS = @ACLECRC_CXXFLAGS@
 ACLOCAL = @ACLOCAL@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
-ARMCRC_CXXFLAGS = @ARMCRC_CXXFLAGS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
@@ -781,7 +783,8 @@ nzbget_SOURCES = daemon/connect/Connection.cpp \
 	lib/yencode/SimdInit.cpp lib/yencode/ScalarDecoder.cpp \
 	lib/yencode/Sse2Decoder.cpp lib/yencode/Ssse3Decoder.cpp \
 	lib/yencode/PclmulCrc.cpp lib/yencode/NeonDecoder.cpp \
-	lib/yencode/ArmCrc.cpp $(am__append_2) $(am__append_3)
+	lib/yencode/AcleCrc.cpp lib/yencode/SliceCrc.cpp \
+	$(am__append_2) $(am__append_3)
 AM_CPPFLAGS = -I$(srcdir)/daemon/connect -I$(srcdir)/daemon/extension \
 	-I$(srcdir)/daemon/feed -I$(srcdir)/daemon/frontend \
 	-I$(srcdir)/daemon/main -I$(srcdir)/daemon/nntp \
@@ -1352,7 +1355,9 @@ lib/yencode/PclmulCrc.$(OBJEXT): lib/yencode/$(am__dirstamp) \
 	lib/yencode/$(DEPDIR)/$(am__dirstamp)
 lib/yencode/NeonDecoder.$(OBJEXT): lib/yencode/$(am__dirstamp) \
 	lib/yencode/$(DEPDIR)/$(am__dirstamp)
-lib/yencode/ArmCrc.$(OBJEXT): lib/yencode/$(am__dirstamp) \
+lib/yencode/AcleCrc.$(OBJEXT): lib/yencode/$(am__dirstamp) \
+	lib/yencode/$(DEPDIR)/$(am__dirstamp)
+lib/yencode/SliceCrc.$(OBJEXT): lib/yencode/$(am__dirstamp) \
 	lib/yencode/$(DEPDIR)/$(am__dirstamp)
 tests/suite/$(am__dirstamp):
 	@$(MKDIR_P) tests/suite
@@ -1601,11 +1606,12 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@lib/par2/$(DEPDIR)/reedsolomon.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/par2/$(DEPDIR)/verificationhashtable.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/par2/$(DEPDIR)/verificationpacket.Po@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/ArmCrc.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/AcleCrc.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/NeonDecoder.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/PclmulCrc.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/ScalarDecoder.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/SimdInit.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/SliceCrc.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/Sse2Decoder.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@lib/yencode/$(DEPDIR)/Ssse3Decoder.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@tests/feed/$(DEPDIR)/FeedFilterTest.Po@am__quote@
@@ -2119,7 +2125,7 @@ lib/yencode/Sse2Decoder.$(OBJEXT) : CXXFLAGS+=$(SSE2_CXXFLAGS)
 lib/yencode/Ssse3Decoder.$(OBJEXT) : CXXFLAGS+=$(SSSE3_CXXFLAGS)
 lib/yencode/PclmulCrc.$(OBJEXT) : CXXFLAGS+=$(PCLMUL_CXXFLAGS)
 lib/yencode/NeonDecoder.$(OBJEXT) : CXXFLAGS+=$(NEON_CXXFLAGS)
-lib/yencode/ArmCrc.$(OBJEXT) : CXXFLAGS+=$(ARMCRC_CXXFLAGS)
+lib/yencode/AcleCrc.$(OBJEXT) : CXXFLAGS+=$(ACLECRC_CXXFLAGS)
 
 # Note about "sed": 
 # We need to make some changes in installed files.
diff --git a/configure b/configure
index bf7bc702..ac91e741 100755
--- a/configure
+++ b/configure
@@ -628,7 +628,7 @@ LTLIBOBJS
 LIBOBJS
 WITH_TESTS_FALSE
 WITH_TESTS_TRUE
-ARMCRC_CXXFLAGS
+ACLECRC_CXXFLAGS
 NEON_CXXFLAGS
 PCLMUL_CXXFLAGS
 SSSE3_CXXFLAGS
@@ -8348,11 +8348,11 @@ case $host_cpu in
 		;;
 	arm)
 		NEON_CXXFLAGS="-mfpu=neon"
-		ARMCRC_CXXFLAGS="-march=armv8-a+crc"
+		ACLECRC_CXXFLAGS="-march=armv8-a+crc"
 		USE_SIMD=yes
 		;;
 	aarch64)
-		ARMCRC_CXXFLAGS="-march=armv8-a+crc"
+		ACLECRC_CXXFLAGS="-march=armv8-a+crc"
 		USE_SIMD=yes
 		;;
 esac
diff --git a/configure.ac b/configure.ac
index 31567676..4e074529 100644
--- a/configure.ac
+++ b/configure.ac
@@ -551,11 +551,11 @@ case $host_cpu in
 		;;
 	arm)
 		NEON_CXXFLAGS="-mfpu=neon"
-		ARMCRC_CXXFLAGS="-march=armv8-a+crc"
+		ACLECRC_CXXFLAGS="-march=armv8-a+crc"
 		USE_SIMD=yes
 		;;
 	aarch64)
-		ARMCRC_CXXFLAGS="-march=armv8-a+crc"
+		ACLECRC_CXXFLAGS="-march=armv8-a+crc"
 		USE_SIMD=yes
 		;;
 esac
@@ -564,7 +564,7 @@ AC_SUBST([SSE2_CXXFLAGS])
 AC_SUBST([SSSE3_CXXFLAGS])
 AC_SUBST([PCLMUL_CXXFLAGS])
 AC_SUBST([NEON_CXXFLAGS])
-AC_SUBST([ARMCRC_CXXFLAGS])
+AC_SUBST([ACLECRC_CXXFLAGS])
 
 
 dnl 
diff --git a/daemon/main/nzbget.cpp b/daemon/main/nzbget.cpp
index b71b939b..1cfa105d 100644
--- a/daemon/main/nzbget.cpp
+++ b/daemon/main/nzbget.cpp
@@ -52,6 +52,7 @@
 #include "FileSystem.h"
 #include "StackTrace.h"
 #include "CommandScript.h"
+#include "YEncode.h"
 #ifdef WIN32
 #include "WinService.h"
 #include "WinConsole.h"
@@ -112,6 +113,7 @@ int main(int argc, char *argv[], char *argp[])
 #endif
 
 	Util::Init();
+	YEncode::init();
 
 	g_ArgumentCount = argc;
 	g_Arguments = (char*(*)[])argv;
@@ -262,7 +264,6 @@ void NZBGet::Init()
 #ifndef DISABLE_TLS
 		TlsSocket::Init();
 #endif
-		Decoder::Init();
 	}
 
 	CreateGlobals();
diff --git a/daemon/nntp/ArticleWriter.cpp b/daemon/nntp/ArticleWriter.cpp
index c3dcf559..2411438f 100644
--- a/daemon/nntp/ArticleWriter.cpp
+++ b/daemon/nntp/ArticleWriter.cpp
@@ -469,7 +469,7 @@ void ArticleWriter::CompleteFileParts()
 
 			if (m_format == Decoder::efYenc)
 			{
-				crc = firstArticle ? pa->GetCrc() : Util::Crc32Combine(crc, pa->GetCrc(), pa->GetSegmentSize());
+				crc = firstArticle ? pa->GetCrc() : Crc32::Combine(crc, pa->GetCrc(), pa->GetSegmentSize());
 				firstArticle = false;
 			}
 		}
diff --git a/daemon/nntp/Decoder.cpp b/daemon/nntp/Decoder.cpp
index 317acbbc..3462f7c7 100644
--- a/daemon/nntp/Decoder.cpp
+++ b/daemon/nntp/Decoder.cpp
@@ -24,21 +24,11 @@
 #include "Util.h"
 #include "YEncode.h"
 
-void Decoder::Init()
-{
-	YEncode::init();
-
-	debug("%s", YEncode::decode_simd ? "SIMD yEnc decoder can be used" : "SIMD yEnc decoder isn't available for this CPU");
-	debug("%s", YEncode::crc32_simd ? "SIMD Crc32 routine can be used" : "SIMD Crc32 routine isn't available for this CPU");
-	debug("%s", YEncode::inc_crc32_simd ? "SIMD Crc32 (incremental) routine can be used" : "SIMD Crc32 (incremental) routine isn't available for this CPU");
-
-	printf("%s\n", YEncode::decode_simd ? "SIMD yEnc decoder can be used" : "SIMD yEnc decoder isn't available for this CPU");
-	printf("%s\n", YEncode::crc32_simd ? "SIMD Crc32 routine can be used" : "SIMD Crc32 routine isn't available for this CPU");
-	printf("%s\n", YEncode::inc_crc32_simd ? "SIMD Crc32 (incremental) routine can be used" : "SIMD Crc32 (incremental) routine isn't available for this CPU");
-}
-
 Decoder::Decoder()
 {
+	debug("%s", YEncode::decode_simd ? "SIMD yEnc decoder can be used" : "SIMD yEnc decoder isn't available for this CPU");
+	debug("%s", YEncode::crc_simd ? "SIMD Crc routine can be used" : "SIMD Crc routine isn't available for this CPU");
+
 	Clear();
 }
 
@@ -52,7 +42,7 @@ void Decoder::Clear()
 	m_crc = false;
 	m_eof = false;
 	m_expectedCRC = 0;
-	m_calculatedCRC = 0xFFFFFFFF;
+	m_crc32.Reset();
 	m_beginPos = 0;
 	m_endPos = 0;
 	m_size = 0;
@@ -326,7 +316,7 @@ int Decoder::DecodeYenc(char* buffer, char* outbuf, int len)
 
 	if (m_crcCheck)
 	{
-		m_calculatedCRC = Util::Crc32m(m_calculatedCRC, (uchar*)outbuf, (uint32)len);
+		m_crc32.Append((uchar*)outbuf, (uint32)len);
 	}
 
 	return len;
@@ -353,7 +343,7 @@ Decoder::EStatus Decoder::Check()
 
 Decoder::EStatus Decoder::CheckYenc()
 {
-	m_calculatedCRC ^= 0xFFFFFFFF;
+	m_calculatedCRC = m_crc32.Finish();
 
 	debug("Expected crc32=%x", m_expectedCRC);
 	debug("Calculated crc32=%x", m_calculatedCRC);
diff --git a/daemon/nntp/Decoder.h b/daemon/nntp/Decoder.h
index 3f48f029..c0f1939e 100644
--- a/daemon/nntp/Decoder.h
+++ b/daemon/nntp/Decoder.h
@@ -22,6 +22,7 @@
 #define DECODER_H
 
 #include "NString.h"
+#include "Util.h"
 
 class Decoder
 {
@@ -44,7 +45,6 @@ public:
 	};
 
 	Decoder();
-	static void Init();
 	EStatus Check();
 	void Clear();
 	int DecodeBuffer(char* buffer, int len);
@@ -79,6 +79,7 @@ private:
 	char m_extraChar;
 	char m_lastChar1;
 	char m_lastChar2;
+	Crc32 m_crc32;
 
 	EFormat DetectFormat(const char* buffer, int len);
 	void ProcessYenc(char* buffer, int len);
diff --git a/daemon/nserv/YEncoder.cpp b/daemon/nserv/YEncoder.cpp
index fbb6cc8a..acaaee1c 100644
--- a/daemon/nserv/YEncoder.cpp
+++ b/daemon/nserv/YEncoder.cpp
@@ -1,7 +1,7 @@
 /*
  *  This file is part of nzbget. See <http://nzbget.net>.
  *
- *  Copyright (C) 2016 Andrey Prygunkov <hugbug@users.sourceforge.net>
+ *  Copyright (C) 2016-2017 Andrey Prygunkov <hugbug@users.sourceforge.net>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -67,7 +67,7 @@ void YEncoder::WriteSegment()
 	outbuf.Append(CString::FormatStr("=ybegin part=%i line=128 size=%lli name=%s\r\n", m_part, (long long)m_fileSize, FileSystem::BaseFileName(m_filename)));
 	outbuf.Append(CString::FormatStr("=ypart begin=%lli end=%lli\r\n", (long long)(m_offset + 1), (long long)(m_offset + m_size)));
 
-	uint32 crc = 0xFFFFFFFF;
+	Crc32 crc;
 	CharBuffer inbuf(std::min(m_size, 16 * 1024 * 1024));
 	int lnsz = 0;
 	char* out = (char*)outbuf + outbuf.Length();
@@ -82,7 +82,7 @@ void YEncoder::WriteSegment()
 			return; // error;
 		}
 
-		crc = Util::Crc32m(crc, (uchar*)(const char*)inbuf, (int)readBytes);
+		crc.Append((uchar*)(const char*)inbuf, (int)readBytes);
 
 		char* in = inbuf;
 		while (readBytes > 0)
@@ -122,10 +122,8 @@ void YEncoder::WriteSegment()
 			}
 		}
 	}
-	crc ^= 0xFFFFFFFF;
-
 	m_diskfile.Close();
 
-	outbuf.Append(CString::FormatStr("=yend size=%i part=0 pcrc32=%08x\r\n", m_size, (unsigned int)crc));
+	outbuf.Append(CString::FormatStr("=yend size=%i part=0 pcrc32=%08x\r\n", m_size, (unsigned int)crc.Finish()));
 	m_writeFunc(outbuf, outbuf.Length());
 }
diff --git a/daemon/postprocess/ParChecker.cpp b/daemon/postprocess/ParChecker.cpp
index 7ae5588d..246e133a 100644
--- a/daemon/postprocess/ParChecker.cpp
+++ b/daemon/postprocess/ParChecker.cpp
@@ -1,7 +1,7 @@
 /*
  *  This file is part of nzbget. See <http://nzbget.net>.
  *
- *  Copyright (C) 2007-2016 Andrey Prygunkov <hugbug@users.sourceforge.net>
+ *  Copyright (C) 2007-2017 Andrey Prygunkov <hugbug@users.sourceforge.net>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -1399,7 +1399,7 @@ bool ParChecker::VerifySuccessDataFile(void* diskfile, void* sourcefile, uint32
 	{
 		const Par2::FILEVERIFICATIONENTRY* entry = packet->VerificationEntry(i);
 		Par2::u32 blockCrc = entry->crc;
-		parCrc = i == 0 ? blockCrc : Util::Crc32Combine(parCrc, blockCrc, (uint32)blocksize);
+		parCrc = i == 0 ? blockCrc : Crc32::Combine(parCrc, blockCrc, (uint32)blocksize);
 	}
 	debug("Block-CRC: %x, filename: %s", parCrc, FileSystem::BaseFileName(sourceFile->GetTargetFile()->FileName().c_str()));
 
@@ -1477,7 +1477,7 @@ bool ParChecker::VerifyPartialDataFile(void* diskfile, void* sourcefile, Segment
 			}
 			const Par2::FILEVERIFICATIONENTRY* entry = packet->VerificationEntry(i);
 			Par2::u32 blockCrc = entry->crc;
-			parCrc = blockStart == i ? blockCrc : Util::Crc32Combine(parCrc, blockCrc, (uint32)blocksize);
+			parCrc = blockStart == i ? blockCrc : Crc32::Combine(parCrc, blockCrc, (uint32)blocksize);
 		}
 		else
 		{
@@ -1537,7 +1537,7 @@ bool ParChecker::SmartCalcFileRangeCrc(DiskFile& file, int64 start, int64 end, S
 
 		if (segment.GetOffset() >= start && segment.GetOffset() + segment.GetSize() <= end)
 		{
-			downloadCrc = !started ? segment.GetCrc() : Util::Crc32Combine(downloadCrc, segment.GetCrc(), (uint32)segment.GetSize());
+			downloadCrc = !started ? segment.GetCrc() : Crc32::Combine(downloadCrc, segment.GetCrc(), (uint32)segment.GetSize());
 			started = true;
 		}
 
@@ -1555,7 +1555,7 @@ bool ParChecker::SmartCalcFileRangeCrc(DiskFile& file, int64 start, int64 end, S
 				return false;
 			}
 
-			downloadCrc = Util::Crc32Combine(downloadCrc, (uint32)partialCrc, (uint32)(end - segment.GetOffset() + 1));
+			downloadCrc = Crc32::Combine(downloadCrc, (uint32)partialCrc, (uint32)(end - segment.GetOffset() + 1));
 
 			break;
 		}
@@ -1576,20 +1576,18 @@ bool ParChecker::DumbCalcFileRangeCrc(DiskFile& file, int64 start, int64 end, ui
 	}
 
 	CharBuffer buffer(1024 * 64);
-	uint32 downloadCrc = 0xFFFFFFFF;
+	Crc32 downloadCrc;
 
 	int cnt = buffer.Size();
 	while (cnt == buffer.Size() && start < end)
 	{
 		int needBytes = end - start + 1 > buffer.Size() ? buffer.Size() : (int)(end - start + 1);
 		cnt = (int)file.Read(buffer, needBytes);
-		downloadCrc = Util::Crc32m(downloadCrc, (uchar*)(char*)buffer, cnt);
+		downloadCrc.Append((uchar*)(char*)buffer, cnt);
 		start += cnt;
 	}
 
-	downloadCrc ^= 0xFFFFFFFF;
-
-	*downloadCrcOut = downloadCrc;
+	*downloadCrcOut = downloadCrc.Finish();
 	return true;
 }
 
diff --git a/daemon/util/Util.cpp b/daemon/util/Util.cpp
index 7e375076..4d580da9 100644
--- a/daemon/util/Util.cpp
+++ b/daemon/util/Util.cpp
@@ -1,7 +1,7 @@
 /*
  *  This file is part of nzbget. See <http://nzbget.net>.
  *
- *  Copyright (C) 2007-2016 Andrey Prygunkov <hugbug@users.sourceforge.net>
+ *  Copyright (C) 2007-2017 Andrey Prygunkov <hugbug@users.sourceforge.net>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -20,6 +20,7 @@
 
 #include "nzbget.h"
 #include "Util.h"			
+#include "YEncode.h"
 
 #ifndef WIN32
 // function "code_revision" is automatically generated in file "code_revision.cpp" on each build
@@ -650,268 +651,6 @@ void Util::SetStandByMode(bool standBy)
 #endif
 }
 
-// Crc32 implementation:
-// http://www.intel.com/technology/comms/perfnet/download/CRC_generators.pdf
-// http://sourceforge.net/projects/slicing-by-8/
-
-static uint32 crc32_tab[4][256] =
-{
-	{
-		0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
-		0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
-		0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
-		0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
-		0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
-		0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
-		0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
-		0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
-		0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
-		0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
-		0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
-		0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
-		0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
-		0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
-		0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
-		0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
-		0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
-		0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
-		0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
-		0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
-		0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
-		0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
-		0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
-		0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
-		0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
-		0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
-		0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
-		0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
-		0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
-		0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
-		0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
-		0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
-	},
-	{
-		0x00000000, 0x191B3141, 0x32366282, 0x2B2D53C3, 0x646CC504, 0x7D77F445, 0x565AA786, 0x4F4196C7,
-		0xC8D98A08, 0xD1C2BB49, 0xFAEFE88A, 0xE3F4D9CB, 0xACB54F0C, 0xB5AE7E4D, 0x9E832D8E, 0x87981CCF,
-		0x4AC21251, 0x53D92310, 0x78F470D3, 0x61EF4192, 0x2EAED755, 0x37B5E614, 0x1C98B5D7, 0x05838496,
-		0x821B9859, 0x9B00A918, 0xB02DFADB, 0xA936CB9A, 0xE6775D5D, 0xFF6C6C1C, 0xD4413FDF, 0xCD5A0E9E,
-		0x958424A2, 0x8C9F15E3, 0xA7B24620, 0xBEA97761, 0xF1E8E1A6, 0xE8F3D0E7, 0xC3DE8324, 0xDAC5B265,
-		0x5D5DAEAA, 0x44469FEB, 0x6F6BCC28, 0x7670FD69, 0x39316BAE, 0x202A5AEF, 0x0B07092C, 0x121C386D,
-		0xDF4636F3, 0xC65D07B2, 0xED705471, 0xF46B6530, 0xBB2AF3F7, 0xA231C2B6, 0x891C9175, 0x9007A034,
-		0x179FBCFB, 0x0E848DBA, 0x25A9DE79, 0x3CB2EF38, 0x73F379FF, 0x6AE848BE, 0x41C51B7D, 0x58DE2A3C,
-		0xF0794F05, 0xE9627E44, 0xC24F2D87, 0xDB541CC6, 0x94158A01, 0x8D0EBB40, 0xA623E883, 0xBF38D9C2,
-		0x38A0C50D, 0x21BBF44C, 0x0A96A78F, 0x138D96CE, 0x5CCC0009, 0x45D73148, 0x6EFA628B, 0x77E153CA,
-		0xBABB5D54, 0xA3A06C15, 0x888D3FD6, 0x91960E97, 0xDED79850, 0xC7CCA911, 0xECE1FAD2, 0xF5FACB93,
-		0x7262D75C, 0x6B79E61D, 0x4054B5DE, 0x594F849F, 0x160E1258, 0x0F152319, 0x243870DA, 0x3D23419B,
-		0x65FD6BA7, 0x7CE65AE6, 0x57CB0925, 0x4ED03864, 0x0191AEA3, 0x188A9FE2, 0x33A7CC21, 0x2ABCFD60,
-		0xAD24E1AF, 0xB43FD0EE, 0x9F12832D, 0x8609B26C, 0xC94824AB, 0xD05315EA, 0xFB7E4629, 0xE2657768,
-		0x2F3F79F6, 0x362448B7, 0x1D091B74, 0x04122A35, 0x4B53BCF2, 0x52488DB3, 0x7965DE70, 0x607EEF31,
-		0xE7E6F3FE, 0xFEFDC2BF, 0xD5D0917C, 0xCCCBA03D, 0x838A36FA, 0x9A9107BB, 0xB1BC5478, 0xA8A76539,
-		0x3B83984B, 0x2298A90A, 0x09B5FAC9, 0x10AECB88, 0x5FEF5D4F, 0x46F46C0E, 0x6DD93FCD, 0x74C20E8C,
-		0xF35A1243, 0xEA412302, 0xC16C70C1, 0xD8774180, 0x9736D747, 0x8E2DE606, 0xA500B5C5, 0xBC1B8484,
-		0x71418A1A, 0x685ABB5B, 0x4377E898, 0x5A6CD9D9, 0x152D4F1E, 0x0C367E5F, 0x271B2D9C, 0x3E001CDD,
-		0xB9980012, 0xA0833153, 0x8BAE6290, 0x92B553D1, 0xDDF4C516, 0xC4EFF457, 0xEFC2A794, 0xF6D996D5,
-		0xAE07BCE9, 0xB71C8DA8, 0x9C31DE6B, 0x852AEF2A, 0xCA6B79ED, 0xD37048AC, 0xF85D1B6F, 0xE1462A2E,
-		0x66DE36E1, 0x7FC507A0, 0x54E85463, 0x4DF36522, 0x02B2F3E5, 0x1BA9C2A4, 0x30849167, 0x299FA026,
-		0xE4C5AEB8, 0xFDDE9FF9, 0xD6F3CC3A, 0xCFE8FD7B, 0x80A96BBC, 0x99B25AFD, 0xB29F093E, 0xAB84387F,
-		0x2C1C24B0, 0x350715F1, 0x1E2A4632, 0x07317773, 0x4870E1B4, 0x516BD0F5, 0x7A468336, 0x635DB277,
-		0xCBFAD74E, 0xD2E1E60F, 0xF9CCB5CC, 0xE0D7848D, 0xAF96124A, 0xB68D230B, 0x9DA070C8, 0x84BB4189,
-		0x03235D46, 0x1A386C07, 0x31153FC4, 0x280E0E85, 0x674F9842, 0x7E54A903, 0x5579FAC0, 0x4C62CB81,
-		0x8138C51F, 0x9823F45E, 0xB30EA79D, 0xAA1596DC, 0xE554001B, 0xFC4F315A, 0xD7626299, 0xCE7953D8,
-		0x49E14F17, 0x50FA7E56, 0x7BD72D95, 0x62CC1CD4, 0x2D8D8A13, 0x3496BB52, 0x1FBBE891, 0x06A0D9D0,
-		0x5E7EF3EC, 0x4765C2AD, 0x6C48916E, 0x7553A02F, 0x3A1236E8, 0x230907A9, 0x0824546A, 0x113F652B,
-		0x96A779E4, 0x8FBC48A5, 0xA4911B66, 0xBD8A2A27, 0xF2CBBCE0, 0xEBD08DA1, 0xC0FDDE62, 0xD9E6EF23,
-		0x14BCE1BD, 0x0DA7D0FC, 0x268A833F, 0x3F91B27E, 0x70D024B9, 0x69CB15F8, 0x42E6463B, 0x5BFD777A,
-		0xDC656BB5, 0xC57E5AF4, 0xEE530937, 0xF7483876, 0xB809AEB1, 0xA1129FF0, 0x8A3FCC33, 0x9324FD72,
-	},
-	{
-		0x00000000, 0x01C26A37, 0x0384D46E, 0x0246BE59, 0x0709A8DC, 0x06CBC2EB, 0x048D7CB2, 0x054F1685,
-		0x0E1351B8, 0x0FD13B8F, 0x0D9785D6, 0x0C55EFE1, 0x091AF964, 0x08D89353, 0x0A9E2D0A, 0x0B5C473D,
-		0x1C26A370, 0x1DE4C947, 0x1FA2771E, 0x1E601D29, 0x1B2F0BAC, 0x1AED619B, 0x18ABDFC2, 0x1969B5F5,
-		0x1235F2C8, 0x13F798FF, 0x11B126A6, 0x10734C91, 0x153C5A14, 0x14FE3023, 0x16B88E7A, 0x177AE44D,
-		0x384D46E0, 0x398F2CD7, 0x3BC9928E, 0x3A0BF8B9, 0x3F44EE3C, 0x3E86840B, 0x3CC03A52, 0x3D025065,
-		0x365E1758, 0x379C7D6F, 0x35DAC336, 0x3418A901, 0x3157BF84, 0x3095D5B3, 0x32D36BEA, 0x331101DD,
-		0x246BE590, 0x25A98FA7, 0x27EF31FE, 0x262D5BC9, 0x23624D4C, 0x22A0277B, 0x20E69922, 0x2124F315,
-		0x2A78B428, 0x2BBADE1F, 0x29FC6046, 0x283E0A71, 0x2D711CF4, 0x2CB376C3, 0x2EF5C89A, 0x2F37A2AD,
-		0x709A8DC0, 0x7158E7F7, 0x731E59AE, 0x72DC3399, 0x7793251C, 0x76514F2B, 0x7417F172, 0x75D59B45,
-		0x7E89DC78, 0x7F4BB64F, 0x7D0D0816, 0x7CCF6221, 0x798074A4, 0x78421E93, 0x7A04A0CA, 0x7BC6CAFD,
-		0x6CBC2EB0, 0x6D7E4487, 0x6F38FADE, 0x6EFA90E9, 0x6BB5866C, 0x6A77EC5B, 0x68315202, 0x69F33835,
-		0x62AF7F08, 0x636D153F, 0x612BAB66, 0x60E9C151, 0x65A6D7D4, 0x6464BDE3, 0x662203BA, 0x67E0698D,
-		0x48D7CB20, 0x4915A117, 0x4B531F4E, 0x4A917579, 0x4FDE63FC, 0x4E1C09CB, 0x4C5AB792, 0x4D98DDA5,
-		0x46C49A98, 0x4706F0AF, 0x45404EF6, 0x448224C1, 0x41CD3244, 0x400F5873, 0x4249E62A, 0x438B8C1D,
-		0x54F16850, 0x55330267, 0x5775BC3E, 0x56B7D609, 0x53F8C08C, 0x523AAABB, 0x507C14E2, 0x51BE7ED5,
-		0x5AE239E8, 0x5B2053DF, 0x5966ED86, 0x58A487B1, 0x5DEB9134, 0x5C29FB03, 0x5E6F455A, 0x5FAD2F6D,
-		0xE1351B80, 0xE0F771B7, 0xE2B1CFEE, 0xE373A5D9, 0xE63CB35C, 0xE7FED96B, 0xE5B86732, 0xE47A0D05,
-		0xEF264A38, 0xEEE4200F, 0xECA29E56, 0xED60F461, 0xE82FE2E4, 0xE9ED88D3, 0xEBAB368A, 0xEA695CBD,
-		0xFD13B8F0, 0xFCD1D2C7, 0xFE976C9E, 0xFF5506A9, 0xFA1A102C, 0xFBD87A1B, 0xF99EC442, 0xF85CAE75,
-		0xF300E948, 0xF2C2837F, 0xF0843D26, 0xF1465711, 0xF4094194, 0xF5CB2BA3, 0xF78D95FA, 0xF64FFFCD,
-		0xD9785D60, 0xD8BA3757, 0xDAFC890E, 0xDB3EE339, 0xDE71F5BC, 0xDFB39F8B, 0xDDF521D2, 0xDC374BE5,
-		0xD76B0CD8, 0xD6A966EF, 0xD4EFD8B6, 0xD52DB281, 0xD062A404, 0xD1A0CE33, 0xD3E6706A, 0xD2241A5D,
-		0xC55EFE10, 0xC49C9427, 0xC6DA2A7E, 0xC7184049, 0xC25756CC, 0xC3953CFB, 0xC1D382A2, 0xC011E895,
-		0xCB4DAFA8, 0xCA8FC59F, 0xC8C97BC6, 0xC90B11F1, 0xCC440774, 0xCD866D43, 0xCFC0D31A, 0xCE02B92D,
-		0x91AF9640, 0x906DFC77, 0x922B422E, 0x93E92819, 0x96A63E9C, 0x976454AB, 0x9522EAF2, 0x94E080C5,
-		0x9FBCC7F8, 0x9E7EADCF, 0x9C381396, 0x9DFA79A1, 0x98B56F24, 0x99770513, 0x9B31BB4A, 0x9AF3D17D,
-		0x8D893530, 0x8C4B5F07, 0x8E0DE15E, 0x8FCF8B69, 0x8A809DEC, 0x8B42F7DB, 0x89044982, 0x88C623B5,
-		0x839A6488, 0x82580EBF, 0x801EB0E6, 0x81DCDAD1, 0x8493CC54, 0x8551A663, 0x8717183A, 0x86D5720D,
-		0xA9E2D0A0, 0xA820BA97, 0xAA6604CE, 0xABA46EF9, 0xAEEB787C, 0xAF29124B, 0xAD6FAC12, 0xACADC625,
-		0xA7F18118, 0xA633EB2F, 0xA4755576, 0xA5B73F41, 0xA0F829C4, 0xA13A43F3, 0xA37CFDAA, 0xA2BE979D,
-		0xB5C473D0, 0xB40619E7, 0xB640A7BE, 0xB782CD89, 0xB2CDDB0C, 0xB30FB13B, 0xB1490F62, 0xB08B6555,
-		0xBBD72268, 0xBA15485F, 0xB853F606, 0xB9919C31, 0xBCDE8AB4, 0xBD1CE083, 0xBF5A5EDA, 0xBE9834ED,
-	},
-	{
-		0x00000000, 0xB8BC6765, 0xAA09C88B, 0x12B5AFEE, 0x8F629757, 0x37DEF032, 0x256B5FDC, 0x9DD738B9,
-		0xC5B428EF, 0x7D084F8A, 0x6FBDE064, 0xD7018701, 0x4AD6BFB8, 0xF26AD8DD, 0xE0DF7733, 0x58631056,
-		0x5019579F, 0xE8A530FA, 0xFA109F14, 0x42ACF871, 0xDF7BC0C8, 0x67C7A7AD, 0x75720843, 0xCDCE6F26,
-		0x95AD7F70, 0x2D111815, 0x3FA4B7FB, 0x8718D09E, 0x1ACFE827, 0xA2738F42, 0xB0C620AC, 0x087A47C9,
-		0xA032AF3E, 0x188EC85B, 0x0A3B67B5, 0xB28700D0, 0x2F503869, 0x97EC5F0C, 0x8559F0E2, 0x3DE59787,
-		0x658687D1, 0xDD3AE0B4, 0xCF8F4F5A, 0x7733283F, 0xEAE41086, 0x525877E3, 0x40EDD80D, 0xF851BF68,
-		0xF02BF8A1, 0x48979FC4, 0x5A22302A, 0xE29E574F, 0x7F496FF6, 0xC7F50893, 0xD540A77D, 0x6DFCC018,
-		0x359FD04E, 0x8D23B72B, 0x9F9618C5, 0x272A7FA0, 0xBAFD4719, 0x0241207C, 0x10F48F92, 0xA848E8F7,
-		0x9B14583D, 0x23A83F58, 0x311D90B6, 0x89A1F7D3, 0x1476CF6A, 0xACCAA80F, 0xBE7F07E1, 0x06C36084,
-		0x5EA070D2, 0xE61C17B7, 0xF4A9B859, 0x4C15DF3C, 0xD1C2E785, 0x697E80E0, 0x7BCB2F0E, 0xC377486B,
-		0xCB0D0FA2, 0x73B168C7, 0x6104C729, 0xD9B8A04C, 0x446F98F5, 0xFCD3FF90, 0xEE66507E, 0x56DA371B,
-		0x0EB9274D, 0xB6054028, 0xA4B0EFC6, 0x1C0C88A3, 0x81DBB01A, 0x3967D77F, 0x2BD27891, 0x936E1FF4,
-		0x3B26F703, 0x839A9066, 0x912F3F88, 0x299358ED, 0xB4446054, 0x0CF80731, 0x1E4DA8DF, 0xA6F1CFBA,
-		0xFE92DFEC, 0x462EB889, 0x549B1767, 0xEC277002, 0x71F048BB, 0xC94C2FDE, 0xDBF98030, 0x6345E755,
-		0x6B3FA09C, 0xD383C7F9, 0xC1366817, 0x798A0F72, 0xE45D37CB, 0x5CE150AE, 0x4E54FF40, 0xF6E89825,
-		0xAE8B8873, 0x1637EF16, 0x048240F8, 0xBC3E279D, 0x21E91F24, 0x99557841, 0x8BE0D7AF, 0x335CB0CA,
-		0xED59B63B, 0x55E5D15E, 0x47507EB0, 0xFFEC19D5, 0x623B216C, 0xDA874609, 0xC832E9E7, 0x708E8E82,
-		0x28ED9ED4, 0x9051F9B1, 0x82E4565F, 0x3A58313A, 0xA78F0983, 0x1F336EE6, 0x0D86C108, 0xB53AA66D,
-		0xBD40E1A4, 0x05FC86C1, 0x1749292F, 0xAFF54E4A, 0x322276F3, 0x8A9E1196, 0x982BBE78, 0x2097D91D,
-		0x78F4C94B, 0xC048AE2E, 0xD2FD01C0, 0x6A4166A5, 0xF7965E1C, 0x4F2A3979, 0x5D9F9697, 0xE523F1F2,
-		0x4D6B1905, 0xF5D77E60, 0xE762D18E, 0x5FDEB6EB, 0xC2098E52, 0x7AB5E937, 0x680046D9, 0xD0BC21BC,
-		0x88DF31EA, 0x3063568F, 0x22D6F961, 0x9A6A9E04, 0x07BDA6BD, 0xBF01C1D8, 0xADB46E36, 0x15080953,
-		0x1D724E9A, 0xA5CE29FF, 0xB77B8611, 0x0FC7E174, 0x9210D9CD, 0x2AACBEA8, 0x38191146, 0x80A57623,
-		0xD8C66675, 0x607A0110, 0x72CFAEFE, 0xCA73C99B, 0x57A4F122, 0xEF189647, 0xFDAD39A9, 0x45115ECC,
-		0x764DEE06, 0xCEF18963, 0xDC44268D, 0x64F841E8, 0xF92F7951, 0x41931E34, 0x5326B1DA, 0xEB9AD6BF,
-		0xB3F9C6E9, 0x0B45A18C, 0x19F00E62, 0xA14C6907, 0x3C9B51BE, 0x842736DB, 0x96929935, 0x2E2EFE50,
-		0x2654B999, 0x9EE8DEFC, 0x8C5D7112, 0x34E11677, 0xA9362ECE, 0x118A49AB, 0x033FE645, 0xBB838120,
-		0xE3E09176, 0x5B5CF613, 0x49E959FD, 0xF1553E98, 0x6C820621, 0xD43E6144, 0xC68BCEAA, 0x7E37A9CF,
-		0xD67F4138, 0x6EC3265D, 0x7C7689B3, 0xC4CAEED6, 0x591DD66F, 0xE1A1B10A, 0xF3141EE4, 0x4BA87981,
-		0x13CB69D7, 0xAB770EB2, 0xB9C2A15C, 0x017EC639, 0x9CA9FE80, 0x241599E5, 0x36A0360B, 0x8E1C516E,
-		0x866616A7, 0x3EDA71C2, 0x2C6FDE2C, 0x94D3B949, 0x090481F0, 0xB1B8E695, 0xA30D497B, 0x1BB12E1E,
-		0x43D23E48, 0xFB6E592D, 0xE9DBF6C3, 0x516791A6, 0xCCB0A91F, 0x740CCE7A, 0x66B96194, 0xDE0506F1,
-	}
-};
-
-// compute CRC32 (Slicing-by-4 algorithm)
-uint32 Util::Crc32m(uint32 startCrc, uchar* block, uint32 length)
-{
-	uint32 crc = startCrc;
-
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-	const uint32* current = (const uint32*)block;
-
-	// process four bytes at once (Slicing-by-4)
-	while (length >= 4)
-	{
-		uint32 one = *current++ ^ crc;
-		crc = crc32_tab[0][(one >> 24) & 0xFF] ^
-			crc32_tab[1][(one >> 16) & 0xFF] ^
-			crc32_tab[2][(one >> 8) & 0xFF] ^
-			crc32_tab[3][one & 0xFF];
-
-		length -= 4;
-	}
-
-	// remaining 1 to 3 bytes (standard algorithm)
-	block = (uchar*)current;
-#endif
-
-	while (length-- != 0)
-	{
-		crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32_tab[0][(crc ^ *block++) & 0xFF];
-	}
-
-	return crc;
-}
-
-uint32 Util::Crc32(uchar *block, uint32 length)
-{
-	return Util::Crc32m(0xFFFFFFFF, block, length) ^ 0xFFFFFFFF;
-}
-
-/* From zlib/crc32.c (http://www.zlib.net/)
- * Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
- */
-
-#define GF2_DIM 32      /* dimension of GF(2) vectors (length of CRC) */
-
-uint32 gf2_matrix_times(uint32 *mat, uint32 vec)
-{
-	uint32 sum;
-
-	sum = 0;
-	while (vec) {
-		if (vec & 1)
-			sum ^= *mat;
-		vec >>= 1;
-		mat++;
-	}
-	return sum;
-}
-
-void gf2_matrix_square(uint32 *square, uint32 *mat)
-{
-	int n;
-
-	for (n = 0; n < GF2_DIM; n++)
-		square[n] = gf2_matrix_times(mat, mat[n]);
-}
-
-uint32 Util::Crc32Combine(uint32 crc1, uint32 crc2, uint32 len2)
-{
-	int n;
-	uint32 row;
-	uint32 even[GF2_DIM];    /* even-power-of-two zeros operator */
-	uint32 odd[GF2_DIM];     /* odd-power-of-two zeros operator */
-
-	/* degenerate case (also disallow negative lengths) */
-	if (len2 <= 0)
-		return crc1;
-
-	/* put operator for one zero bit in odd */
-	odd[0] = 0xedb88320UL;          /* CRC-32 polynomial */
-	row = 1;
-	for (n = 1; n < GF2_DIM; n++) {
-		odd[n] = row;
-		row <<= 1;
-	}
-
-	/* put operator for two zero bits in even */
-	gf2_matrix_square(even, odd);
-
-	/* put operator for four zero bits in odd */
-	gf2_matrix_square(odd, even);
-
-	/* apply len2 zeros to crc1 (first square will put the operator for one
-	   zero byte, eight zero bits, in even) */
-	do {
-		/* apply zeros operator for this bit of len2 */
-		gf2_matrix_square(even, odd);
-		if (len2 & 1)
-			crc1 = gf2_matrix_times(even, crc1);
-		len2 >>= 1;
-
-		/* if no more bits set, then done */
-		if (len2 == 0)
-			break;
-
-		/* another iteration of the loop with odd and even swapped */
-		gf2_matrix_square(odd, even);
-		if (len2 & 1)
-			crc1 = gf2_matrix_times(odd, crc1);
-		len2 >>= 1;
-
-		/* if no more bits set, then done */
-	} while (len2 != 0);
-
-	/* return combined crc */
-	crc1 ^= crc2;
-
-	return crc1;
-}
-
 int Util::NumberOfCpuCores()
 {
 #ifdef WIN32
@@ -2097,3 +1836,101 @@ char* Tokenizer::Next()
 	}
 	return token;
 }
+
+void Crc32::Reset()
+{
+	static_assert(sizeof(m_state) >= sizeof(YEncode::crc_state), "m_state has invalid size");
+
+	YEncode::crc_init((YEncode::crc_state*)&m_state);
+}
+
+void Crc32::Append(uchar* block, uint32 length)
+{
+	YEncode::crc_incr((YEncode::crc_state*)&m_state, block, length);
+}
+
+uint32 Crc32::Finish()
+{
+	return YEncode::crc_finish((YEncode::crc_state*)&m_state);
+}
+
+/* From zlib/crc32.c (http://www.zlib.net/)
+ * Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
+ */
+
+#define GF2_DIM 32      /* dimension of GF(2) vectors (length of CRC) */
+
+uint32 gf2_matrix_times(uint32 *mat, uint32 vec)
+{
+	uint32 sum;
+
+	sum = 0;
+	while (vec) {
+		if (vec & 1)
+			sum ^= *mat;
+		vec >>= 1;
+		mat++;
+	}
+	return sum;
+}
+
+void gf2_matrix_square(uint32 *square, uint32 *mat)
+{
+	int n;
+
+	for (n = 0; n < GF2_DIM; n++)
+		square[n] = gf2_matrix_times(mat, mat[n]);
+}
+
+uint32 Crc32::Combine(uint32 crc1, uint32 crc2, uint32 len2)
+{
+	int n;
+	uint32 row;
+	uint32 even[GF2_DIM];    /* even-power-of-two zeros operator */
+	uint32 odd[GF2_DIM];     /* odd-power-of-two zeros operator */
+
+	/* degenerate case (also disallow negative lengths) */
+	if (len2 <= 0)
+		return crc1;
+
+	/* put operator for one zero bit in odd */
+	odd[0] = 0xedb88320UL;          /* CRC-32 polynomial */
+	row = 1;
+	for (n = 1; n < GF2_DIM; n++) {
+		odd[n] = row;
+		row <<= 1;
+	}
+
+	/* put operator for two zero bits in even */
+	gf2_matrix_square(even, odd);
+
+	/* put operator for four zero bits in odd */
+	gf2_matrix_square(odd, even);
+
+	/* apply len2 zeros to crc1 (first square will put the operator for one
+	   zero byte, eight zero bits, in even) */
+	do {
+		/* apply zeros operator for this bit of len2 */
+		gf2_matrix_square(even, odd);
+		if (len2 & 1)
+			crc1 = gf2_matrix_times(even, crc1);
+		len2 >>= 1;
+
+		/* if no more bits set, then done */
+		if (len2 == 0)
+			break;
+
+		/* another iteration of the loop with odd and even swapped */
+		gf2_matrix_square(odd, even);
+		if (len2 & 1)
+			crc1 = gf2_matrix_times(odd, crc1);
+		len2 >>= 1;
+
+		/* if no more bits set, then done */
+	} while (len2 != 0);
+
+	/* return combined crc */
+	crc1 ^= crc2;
+
+	return crc1;
+}
diff --git a/daemon/util/Util.h b/daemon/util/Util.h
index 7af16d26..86c09a08 100644
--- a/daemon/util/Util.h
+++ b/daemon/util/Util.h
@@ -86,10 +86,6 @@ public:
 
 	static void Init();
 
-	static uint32 Crc32(uchar *block, uint32 length);
-	static uint32 Crc32m(uint32 startCrc, uchar *block, uint32 length);
-	static uint32 Crc32Combine(uint32 crc1, uint32 crc2, uint32 len2);
-
 	/*
 	* Returns number of available CPU cores or -1 if it could not be determined
 	*/
@@ -317,4 +313,17 @@ private:
 	bool m_working = false;
 };
 
+class Crc32
+{
+public:
+	Crc32() { Reset(); }
+	void Reset();
+	void Append(uchar* block, uint32 length);
+	uint32 Finish();
+	static uint32 Combine(uint32 crc1, uint32 crc2, uint32 len2);
+
+private:
+	alignas(16) uint32_t m_state[4 * 5]; // = YEncode::crc_state
+};
+
 #endif
diff --git a/lib/yencode/ArmCrc.cpp b/lib/yencode/AcleCrc.cpp
similarity index 78%
rename from lib/yencode/ArmCrc.cpp
rename to lib/yencode/AcleCrc.cpp
index 85a8a973..192a2163 100644
--- a/lib/yencode/ArmCrc.cpp
+++ b/lib/yencode/AcleCrc.cpp
@@ -20,6 +20,8 @@
 
 #include "nzbget.h"
 
+#include "YEncode.h"
+
 #ifdef __ARM_FEATURE_CRC32
 #include <arm_acle.h>
 #endif
@@ -28,7 +30,14 @@ namespace YEncode
 {
 #ifdef __ARM_FEATURE_CRC32
 
-inline uint32_t crc_arm(uint32_t crc, const unsigned char *src, long len) {
+void crc_arm_init(crc_state *const s)
+{
+	s->crc0[0] = ~0;
+}
+
+void crc_arm(crc_state *const s, const unsigned char *src, long len) {
+	uint32_t crc = s->crc0[0];
+
 	// initial alignment
 	if (len >= 16) { // 16 is an arbitrary number; it just needs to be >=8
 		if ((uintptr_t)src & sizeof(uint8_t)) {
@@ -71,23 +80,25 @@ inline uint32_t crc_arm(uint32_t crc, const unsigned char *src, long len) {
 	if (len & sizeof(uint8_t))
 		crc = __crc32b(crc, *src);
 	
-	return crc;
+	s->crc0[0] = crc;
 }
 
-uint32_t do_crc32_arm(const unsigned char *src, long len)
+uint32_t crc_arm_finish(crc_state *const s)
 {
-	return ~crc_arm(~0, src, len);
+	return ~s->crc0[0];
 }
 
-extern uint32_t (*crc32_arm)(const unsigned char *src, long len);
-extern uint32_t (*inc_crc32_simd)(uint32_t crc, const unsigned char* src, long len);
+extern void (*crc_init_acle)(crc_state *const s);
+extern void (*crc_incr_acle)(crc_state *const s, const unsigned char *src, long len);
+extern uint32_t (*crc_finish_acle)(crc_state *const s);
 #endif
 
-void init_crc32_arm()
+void init_crc_acle()
 {
 #ifdef __ARM_FEATURE_CRC32
-	crc32_arm = &do_crc32_arm;
-	inc_crc32_simd = &crc_arm;
+	crc_init_acle = &crc_arm_init;
+	crc_incr_acle = &crc_arm;
+	crc_finish_acle = &crc_arm_finish;
 #endif
 }
 
diff --git a/lib/yencode/PclmulCrc.cpp b/lib/yencode/PclmulCrc.cpp
index 7080fa62..39d40954 100644
--- a/lib/yencode/PclmulCrc.cpp
+++ b/lib/yencode/PclmulCrc.cpp
@@ -45,6 +45,11 @@ namespace YEncode
 {
 #ifdef __PCLMUL__
 
+struct crc_state
+{
+	alignas(16) unsigned crc0[4 * 5];
+};
+
 void fold_1(__m128i *xmm_crc0, __m128i *xmm_crc1, __m128i *xmm_crc2, __m128i *xmm_crc3) {
 	const __m128i xmm_fold4 = _mm_set_epi32(
 			0x00000001, 0x54442bd4,
@@ -263,181 +268,209 @@ alignas(16) const unsigned crc_mask2[4] = {
 	0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF
 };
 
-inline uint32_t crc_fold(const unsigned char *src, long len) {
-	unsigned long algn_diff;
-	__m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;
+#define CRC_LOAD(s) \
+    do { \
+        __m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0);\
+        __m128i xmm_crc1 = _mm_loadu_si128((__m128i *)s->crc0 + 1);\
+        __m128i xmm_crc2 = _mm_loadu_si128((__m128i *)s->crc0 + 2);\
+        __m128i xmm_crc3 = _mm_loadu_si128((__m128i *)s->crc0 + 3);\
+        __m128i xmm_crc_part = _mm_loadu_si128((__m128i *)s->crc0 + 4);
 
-	__m128i xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
-	__m128i xmm_crc1 = _mm_setzero_si128();
-	__m128i xmm_crc2 = _mm_setzero_si128();
-	__m128i xmm_crc3 = _mm_setzero_si128();
-	__m128i xmm_crc_part;
+#define CRC_SAVE(s) \
+        _mm_storeu_si128((__m128i *)s->crc0 + 0, xmm_crc0);\
+        _mm_storeu_si128((__m128i *)s->crc0 + 1, xmm_crc1);\
+        _mm_storeu_si128((__m128i *)s->crc0 + 2, xmm_crc2);\
+        _mm_storeu_si128((__m128i *)s->crc0 + 3, xmm_crc3);\
+        _mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part);\
+    } while (0);
 
-	if (len < 16) {
-		if (len == 0)
-			return 0;
-		xmm_crc_part = _mm_loadu_si128((__m128i *)src);
-		goto partial;
-	}
+void crc_fold_init(crc_state *const s) {
+    CRC_LOAD(s)
 
-	algn_diff = (0 - (uintptr_t)src) & 0xF;
-	if (algn_diff) {
-		xmm_crc_part = _mm_loadu_si128((__m128i *)src);
+    xmm_crc0 = _mm_cvtsi32_si128(0x9db42487);
+    xmm_crc1 = _mm_setzero_si128();
+    xmm_crc2 = _mm_setzero_si128();
+    xmm_crc3 = _mm_setzero_si128();
 
-		src += algn_diff;
-		len -= algn_diff;
+    CRC_SAVE(s)
+}
 
-		partial_fold(algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
-			&xmm_crc_part);
-	}
+void crc_fold(crc_state *const s, const unsigned char *src, long len) {
+    unsigned long algn_diff;
+    __m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3;
 
-	while ((len -= 64) >= 0) {
-		xmm_t0 = _mm_load_si128((__m128i *)src);
-		xmm_t1 = _mm_load_si128((__m128i *)src + 1);
-		xmm_t2 = _mm_load_si128((__m128i *)src + 2);
-		xmm_t3 = _mm_load_si128((__m128i *)src + 3);
+    CRC_LOAD(s)
 
-		fold_4(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+    if (len < 16) {
+        if (len == 0)
+            return;
+        xmm_crc_part = _mm_loadu_si128((__m128i *)src);
+        goto partial;
+    }
 
-		xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0);
-		xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1);
-		xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2);
-		xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3);
+    algn_diff = (0 - (uintptr_t)src) & 0xF;
+    if (algn_diff) {
+        xmm_crc_part = _mm_loadu_si128((__m128i *)src);
+        src += algn_diff;
+        len -= algn_diff;
 
-		src += 64;
-	}
+        partial_fold(algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, &xmm_crc_part);
+    }
 
-	/*
-	 * len = num bytes left - 64
-	 */
-	if (len + 16 >= 0) {
-		len += 16;
+    while ((len -= 64) >= 0) {
+        xmm_t0 = _mm_load_si128((__m128i *)src);
+        xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+        xmm_t2 = _mm_load_si128((__m128i *)src + 2);
+        xmm_t3 = _mm_load_si128((__m128i *)src + 3);
 
-		xmm_t0 = _mm_load_si128((__m128i *)src);
-		xmm_t1 = _mm_load_si128((__m128i *)src + 1);
-		xmm_t2 = _mm_load_si128((__m128i *)src + 2);
+        fold_4(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
 
-		fold_3(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+        xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0);
+        xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1);
+        xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2);
+        xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3);
 
-		xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t0);
-		xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t1);
-		xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t2);
+        src += 64;
+    }
 
-		if (len == 0)
-			goto done;
+    /*
+     * len = num bytes left - 64
+     */
+    if (len + 16 >= 0) {
+        len += 16;
 
-		xmm_crc_part = _mm_load_si128((__m128i *)src + 3);
-	} else if (len + 32 >= 0) {
-		len += 32;
+        xmm_t0 = _mm_load_si128((__m128i *)src);
+        xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+        xmm_t2 = _mm_load_si128((__m128i *)src + 2);
 
-		xmm_t0 = _mm_load_si128((__m128i *)src);
-		xmm_t1 = _mm_load_si128((__m128i *)src + 1);
+        fold_3(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
 
-		fold_2(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+        xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t0);
+        xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t1);
+        xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t2);
 
-		xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0);
-		xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1);
+        if (len == 0)
+            goto done;
 
-		if (len == 0)
-			goto done;
+        xmm_crc_part = _mm_load_si128((__m128i *)src + 3);
+    } else if (len + 32 >= 0) {
+        len += 32;
 
-		xmm_crc_part = _mm_load_si128((__m128i *)src + 2);
-	} else if (len + 48 >= 0) {
-		len += 48;
+        xmm_t0 = _mm_load_si128((__m128i *)src);
+        xmm_t1 = _mm_load_si128((__m128i *)src + 1);
 
-		xmm_t0 = _mm_load_si128((__m128i *)src);
+        fold_2(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
 
-		fold_1(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+        xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0);
+        xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1);
 
-		xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);
+        if (len == 0)
+            goto done;
 
-		if (len == 0)
-			goto done;
+        xmm_crc_part = _mm_load_si128((__m128i *)src + 2);
+    } else if (len + 48 >= 0) {
+        len += 48;
 
-		xmm_crc_part = _mm_load_si128((__m128i *)src + 1);
-	} else {
-		len += 64;
-		if (len == 0)
-			goto done;
-		xmm_crc_part = _mm_load_si128((__m128i *)src);
-	}
+        xmm_t0 = _mm_load_si128((__m128i *)src);
+
+        fold_1(&xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3);
+
+        xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0);
+
+        if (len == 0)
+            goto done;
+
+        xmm_crc_part = _mm_load_si128((__m128i *)src + 1);
+    } else {
+        len += 64;
+        if (len == 0)
+            goto done;
+        xmm_crc_part = _mm_load_si128((__m128i *)src);
+    }
 
 partial:
-	partial_fold(len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3,
-		&xmm_crc_part);
+    partial_fold(len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, &xmm_crc_part);
 done:
-{
-	const __m128i xmm_mask  = _mm_load_si128((__m128i *)crc_mask);
-	const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2);
-
-	uint32_t crc;
-	__m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;
-
-	/*
-	 * k1
-	 */
-	crc_fold = _mm_load_si128((__m128i *)crc_k);
-
-	x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10);
-	xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01);
-	xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0);
-	xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0);
-
-	x_tmp1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x10);
-	xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x01);
-	xmm_crc2 = _mm_xor_si128(xmm_crc2, x_tmp1);
-	xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_crc1);
-
-	x_tmp2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x10);
-	xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x01);
-	xmm_crc3 = _mm_xor_si128(xmm_crc3, x_tmp2);
-	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
-
-	/*
-	 * k5
-	 */
-	crc_fold = _mm_load_si128((__m128i *)crc_k + 1);
-
-	xmm_crc0 = xmm_crc3;
-	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
-	xmm_crc0 = _mm_srli_si128(xmm_crc0, 8);
-	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
-
-	xmm_crc0 = xmm_crc3;
-	xmm_crc3 = _mm_slli_si128(xmm_crc3, 4);
-	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
-	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
-	xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask2);
-
-	/*
-	 * k7
-	 */
-	xmm_crc1 = xmm_crc3;
-	xmm_crc2 = xmm_crc3;
-	crc_fold = _mm_load_si128((__m128i *)crc_k + 2);
-
-	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
-	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
-	xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask);
-
-	xmm_crc2 = xmm_crc3;
-	xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
-	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
-	xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc1);
-
-	crc = _mm_extract_epi32(xmm_crc3, 2);
-	return ~crc;
+    CRC_SAVE(s)
 }
 
+uint32_t crc_fold_512to32(crc_state *const s) {
+    const __m128i xmm_mask  = _mm_load_si128((__m128i *)crc_mask);
+    const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2);
+
+    uint32_t crc;
+    __m128i x_tmp0, x_tmp1, x_tmp2, crc_fold;
+
+    CRC_LOAD(s)
+
+    /*
+     * k1
+     */
+    crc_fold = _mm_load_si128((__m128i *)crc_k);
+
+    x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10);
+    xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01);
+    xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0);
+    xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0);
+
+    x_tmp1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x10);
+    xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x01);
+    xmm_crc2 = _mm_xor_si128(xmm_crc2, x_tmp1);
+    xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_crc1);
+
+    x_tmp2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x10);
+    xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x01);
+    xmm_crc3 = _mm_xor_si128(xmm_crc3, x_tmp2);
+    xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
+
+    /*
+     * k5
+     */
+    crc_fold = _mm_load_si128((__m128i *)crc_k + 1);
+
+    xmm_crc0 = xmm_crc3;
+    xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
+    xmm_crc0 = _mm_srli_si128(xmm_crc0, 8);
+    xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
+
+    xmm_crc0 = xmm_crc3;
+    xmm_crc3 = _mm_slli_si128(xmm_crc3, 4);
+    xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
+    xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0);
+    xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask2);
+
+    /*
+     * k7
+     */
+    xmm_crc1 = xmm_crc3;
+    xmm_crc2 = xmm_crc3;
+    crc_fold = _mm_load_si128((__m128i *)crc_k + 2);
+
+    xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0);
+    xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
+    xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask);
+
+    xmm_crc2 = xmm_crc3;
+    xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10);
+    xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2);
+    xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc1);
+
+    crc = _mm_extract_epi32(xmm_crc3, 2);
+    return ~crc;
+    CRC_SAVE(s)
 }
 
-extern uint32_t (*crc32_pclmul)(const unsigned char *src, long len);
+extern void (*crc_init_pclmul)(crc_state *const s);
+extern void (*crc_incr_pclmul)(crc_state *const s, const unsigned char *src, long len);
+extern uint32_t (*crc_finish_pclmul)(crc_state *const s);
 #endif
 
-void init_crc32_pclmul()
+void init_crc_pclmul()
 {
 #ifdef __PCLMUL__
-	crc32_pclmul = &crc_fold;
+	crc_init_pclmul = &crc_fold_init;
+	crc_incr_pclmul = &crc_fold;
+	crc_finish_pclmul = &crc_fold_512to32;
 #endif
 }
 
diff --git a/lib/yencode/SimdInit.cpp b/lib/yencode/SimdInit.cpp
index a5309606..3d7c8140 100644
--- a/lib/yencode/SimdInit.cpp
+++ b/lib/yencode/SimdInit.cpp
@@ -32,17 +32,28 @@ namespace YEncode
 {
 
 size_t (*decode)(const unsigned char*, unsigned char*, size_t, char* state) = nullptr;
-size_t (*decode_simd)(const unsigned char*, unsigned char*, size_t, char* state) = nullptr;
-uint32_t (*crc32_simd)(const unsigned char* src, long len) = nullptr;
-uint32_t (*inc_crc32_simd)(uint32_t crc, const unsigned char* src, long len) = nullptr;
+bool decode_simd = false;
+
+void (*crc_init)(crc_state *const s) = nullptr;
+void (*crc_incr)(crc_state *const s, const unsigned char *src, long len) = nullptr;
+uint32_t (*crc_finish)(crc_state *const s) = nullptr;
+bool crc_simd = false;
+
+void crc_slice_init(crc_state *const s);
+void crc_slice(crc_state *const s, const unsigned char *src, long len);
+uint32_t crc_slice_finish(crc_state *const s);
 
 #if defined(__i686__) || defined(__amd64__)
 size_t (*decode_sse2)(const unsigned char* src, unsigned char* dest, size_t len, char* state) = nullptr;
 extern void init_decode_sse2();
+
 size_t (*decode_ssse3)(const unsigned char* src, unsigned char* dest, size_t len, char* state) = nullptr;
 extern void init_decode_ssse3();
-uint32_t (*crc32_pclmul)(const unsigned char *src, long len) = nullptr;
-extern void init_crc32_pclmul();
+
+void (*crc_init_pclmul)(crc_state *const s) = nullptr;
+void (*crc_incr_pclmul)(crc_state *const s, const unsigned char *src, long len) = nullptr;
+uint32_t (*crc_finish_pclmul)(crc_state *const s) = nullptr;
+extern void init_crc_pclmul();
 
 class CpuId
 {
@@ -66,13 +77,19 @@ public:
 #if defined(__arm__) || defined(__aarch64__)
 size_t (*decode_neon)(const unsigned char* src, unsigned char* dest, size_t len, char* state) = nullptr;
 extern void init_decode_neon();
-uint32_t (*crc32_arm)(const unsigned char *src, long len) = nullptr;
-extern void init_crc32_arm();
+
+void (*crc_init_acle)(crc_state *const s) = nullptr;
+void (*crc_incr_acle)(crc_state *const s, const unsigned char *src, long len) = nullptr;
+uint32_t (*crc_finish_acle)(crc_state *const s) = nullptr;
+extern void init_crc_acle();
 #endif
 
 void init()
 {
 	decode = &decode_scalar;
+	crc_init = &crc_slice_init;
+	crc_incr = &crc_slice;
+	crc_finish = &crc_slice_finish;
 
 #if defined(__i686__) || defined(__amd64__)
 	CpuId cpuid(1);
@@ -85,20 +102,31 @@ void init()
 	if (cpu_supports_sse2)
 	{
 		init_decode_sse2();
-		decode_simd = decode_sse2;
+		if (decode_sse2)
+		{
+			decode = decode_sse2;
+			decode_simd = true;
+		}
 	}
 	if (cpu_supports_ssse3)
 	{
 		init_decode_ssse3();
 		if (decode_ssse3)
 		{
-			decode_simd = decode_ssse3;
+			decode = decode_ssse3;
+			decode_simd = true;
 		}
 	}
 	if (cpu_supports_sse41 && cpu_supports_pclmul)
 	{
-		init_crc32_pclmul();
-		crc32_simd = crc32_pclmul;
+		init_crc_pclmul();
+		if (crc_init_pclmul && crc_incr_pclmul && crc_finish_pclmul)
+		{
+			crc_init = crc_init_pclmul;
+			crc_incr = crc_incr_pclmul;
+			crc_finish = crc_finish_pclmul;
+			crc_simd = true;
+		}
 	}
 #endif
 
@@ -123,19 +151,24 @@ void init()
 	if (cpu_supports_neon)
 	{
 		init_decode_neon();
-		decode_simd = decode_neon;
+		if (decode_neon)
+		{
+			decode = decode_neon;
+			decode_simd = true;
+		}
 	}
 	if (cpu_supports_crc)
 	{
-		init_crc32_arm();
-		crc32_simd = crc32_arm;
+		init_crc_acle();
+		if (crc_init_acle && crc_incr_acle && crc_finish_acle)
+		{
+			crc_init = crc_init_acle;
+			crc_incr = crc_incr_acle;
+			crc_finish = crc_finish_acle;
+			crc_simd = true;
+		}
 	}
 #endif
-
-	if (decode_simd)
-	{
-		decode = decode_simd;
-	}
 }
 
 }
diff --git a/lib/yencode/SliceCrc.cpp b/lib/yencode/SliceCrc.cpp
new file mode 100644
index 00000000..fc35426c
--- /dev/null
+++ b/lib/yencode/SliceCrc.cpp
@@ -0,0 +1,209 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "nzbget.h"
+
+#include "YEncode.h"
+
+namespace YEncode
+{
+
+// Crc32 implementation:
+// http://www.intel.com/technology/comms/perfnet/download/CRC_generators.pdf
+// http://sourceforge.net/projects/slicing-by-8/
+
+static uint32_t crc32_tab[4][256] =
+{
+	{
+		0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+		0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+		0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+		0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+		0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+		0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+		0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+		0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+		0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+		0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+		0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+		0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+		0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+		0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+		0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+		0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+		0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+		0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+		0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+		0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+		0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+		0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+		0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+		0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+		0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
+		0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
+		0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+		0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+		0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+		0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+		0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+		0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
+	},
+	{
+		0x00000000, 0x191B3141, 0x32366282, 0x2B2D53C3, 0x646CC504, 0x7D77F445, 0x565AA786, 0x4F4196C7,
+		0xC8D98A08, 0xD1C2BB49, 0xFAEFE88A, 0xE3F4D9CB, 0xACB54F0C, 0xB5AE7E4D, 0x9E832D8E, 0x87981CCF,
+		0x4AC21251, 0x53D92310, 0x78F470D3, 0x61EF4192, 0x2EAED755, 0x37B5E614, 0x1C98B5D7, 0x05838496,
+		0x821B9859, 0x9B00A918, 0xB02DFADB, 0xA936CB9A, 0xE6775D5D, 0xFF6C6C1C, 0xD4413FDF, 0xCD5A0E9E,
+		0x958424A2, 0x8C9F15E3, 0xA7B24620, 0xBEA97761, 0xF1E8E1A6, 0xE8F3D0E7, 0xC3DE8324, 0xDAC5B265,
+		0x5D5DAEAA, 0x44469FEB, 0x6F6BCC28, 0x7670FD69, 0x39316BAE, 0x202A5AEF, 0x0B07092C, 0x121C386D,
+		0xDF4636F3, 0xC65D07B2, 0xED705471, 0xF46B6530, 0xBB2AF3F7, 0xA231C2B6, 0x891C9175, 0x9007A034,
+		0x179FBCFB, 0x0E848DBA, 0x25A9DE79, 0x3CB2EF38, 0x73F379FF, 0x6AE848BE, 0x41C51B7D, 0x58DE2A3C,
+		0xF0794F05, 0xE9627E44, 0xC24F2D87, 0xDB541CC6, 0x94158A01, 0x8D0EBB40, 0xA623E883, 0xBF38D9C2,
+		0x38A0C50D, 0x21BBF44C, 0x0A96A78F, 0x138D96CE, 0x5CCC0009, 0x45D73148, 0x6EFA628B, 0x77E153CA,
+		0xBABB5D54, 0xA3A06C15, 0x888D3FD6, 0x91960E97, 0xDED79850, 0xC7CCA911, 0xECE1FAD2, 0xF5FACB93,
+		0x7262D75C, 0x6B79E61D, 0x4054B5DE, 0x594F849F, 0x160E1258, 0x0F152319, 0x243870DA, 0x3D23419B,
+		0x65FD6BA7, 0x7CE65AE6, 0x57CB0925, 0x4ED03864, 0x0191AEA3, 0x188A9FE2, 0x33A7CC21, 0x2ABCFD60,
+		0xAD24E1AF, 0xB43FD0EE, 0x9F12832D, 0x8609B26C, 0xC94824AB, 0xD05315EA, 0xFB7E4629, 0xE2657768,
+		0x2F3F79F6, 0x362448B7, 0x1D091B74, 0x04122A35, 0x4B53BCF2, 0x52488DB3, 0x7965DE70, 0x607EEF31,
+		0xE7E6F3FE, 0xFEFDC2BF, 0xD5D0917C, 0xCCCBA03D, 0x838A36FA, 0x9A9107BB, 0xB1BC5478, 0xA8A76539,
+		0x3B83984B, 0x2298A90A, 0x09B5FAC9, 0x10AECB88, 0x5FEF5D4F, 0x46F46C0E, 0x6DD93FCD, 0x74C20E8C,
+		0xF35A1243, 0xEA412302, 0xC16C70C1, 0xD8774180, 0x9736D747, 0x8E2DE606, 0xA500B5C5, 0xBC1B8484,
+		0x71418A1A, 0x685ABB5B, 0x4377E898, 0x5A6CD9D9, 0x152D4F1E, 0x0C367E5F, 0x271B2D9C, 0x3E001CDD,
+		0xB9980012, 0xA0833153, 0x8BAE6290, 0x92B553D1, 0xDDF4C516, 0xC4EFF457, 0xEFC2A794, 0xF6D996D5,
+		0xAE07BCE9, 0xB71C8DA8, 0x9C31DE6B, 0x852AEF2A, 0xCA6B79ED, 0xD37048AC, 0xF85D1B6F, 0xE1462A2E,
+		0x66DE36E1, 0x7FC507A0, 0x54E85463, 0x4DF36522, 0x02B2F3E5, 0x1BA9C2A4, 0x30849167, 0x299FA026,
+		0xE4C5AEB8, 0xFDDE9FF9, 0xD6F3CC3A, 0xCFE8FD7B, 0x80A96BBC, 0x99B25AFD, 0xB29F093E, 0xAB84387F,
+		0x2C1C24B0, 0x350715F1, 0x1E2A4632, 0x07317773, 0x4870E1B4, 0x516BD0F5, 0x7A468336, 0x635DB277,
+		0xCBFAD74E, 0xD2E1E60F, 0xF9CCB5CC, 0xE0D7848D, 0xAF96124A, 0xB68D230B, 0x9DA070C8, 0x84BB4189,
+		0x03235D46, 0x1A386C07, 0x31153FC4, 0x280E0E85, 0x674F9842, 0x7E54A903, 0x5579FAC0, 0x4C62CB81,
+		0x8138C51F, 0x9823F45E, 0xB30EA79D, 0xAA1596DC, 0xE554001B, 0xFC4F315A, 0xD7626299, 0xCE7953D8,
+		0x49E14F17, 0x50FA7E56, 0x7BD72D95, 0x62CC1CD4, 0x2D8D8A13, 0x3496BB52, 0x1FBBE891, 0x06A0D9D0,
+		0x5E7EF3EC, 0x4765C2AD, 0x6C48916E, 0x7553A02F, 0x3A1236E8, 0x230907A9, 0x0824546A, 0x113F652B,
+		0x96A779E4, 0x8FBC48A5, 0xA4911B66, 0xBD8A2A27, 0xF2CBBCE0, 0xEBD08DA1, 0xC0FDDE62, 0xD9E6EF23,
+		0x14BCE1BD, 0x0DA7D0FC, 0x268A833F, 0x3F91B27E, 0x70D024B9, 0x69CB15F8, 0x42E6463B, 0x5BFD777A,
+		0xDC656BB5, 0xC57E5AF4, 0xEE530937, 0xF7483876, 0xB809AEB1, 0xA1129FF0, 0x8A3FCC33, 0x9324FD72,
+	},
+	{
+		0x00000000, 0x01C26A37, 0x0384D46E, 0x0246BE59, 0x0709A8DC, 0x06CBC2EB, 0x048D7CB2, 0x054F1685,
+		0x0E1351B8, 0x0FD13B8F, 0x0D9785D6, 0x0C55EFE1, 0x091AF964, 0x08D89353, 0x0A9E2D0A, 0x0B5C473D,
+		0x1C26A370, 0x1DE4C947, 0x1FA2771E, 0x1E601D29, 0x1B2F0BAC, 0x1AED619B, 0x18ABDFC2, 0x1969B5F5,
+		0x1235F2C8, 0x13F798FF, 0x11B126A6, 0x10734C91, 0x153C5A14, 0x14FE3023, 0x16B88E7A, 0x177AE44D,
+		0x384D46E0, 0x398F2CD7, 0x3BC9928E, 0x3A0BF8B9, 0x3F44EE3C, 0x3E86840B, 0x3CC03A52, 0x3D025065,
+		0x365E1758, 0x379C7D6F, 0x35DAC336, 0x3418A901, 0x3157BF84, 0x3095D5B3, 0x32D36BEA, 0x331101DD,
+		0x246BE590, 0x25A98FA7, 0x27EF31FE, 0x262D5BC9, 0x23624D4C, 0x22A0277B, 0x20E69922, 0x2124F315,
+		0x2A78B428, 0x2BBADE1F, 0x29FC6046, 0x283E0A71, 0x2D711CF4, 0x2CB376C3, 0x2EF5C89A, 0x2F37A2AD,
+		0x709A8DC0, 0x7158E7F7, 0x731E59AE, 0x72DC3399, 0x7793251C, 0x76514F2B, 0x7417F172, 0x75D59B45,
+		0x7E89DC78, 0x7F4BB64F, 0x7D0D0816, 0x7CCF6221, 0x798074A4, 0x78421E93, 0x7A04A0CA, 0x7BC6CAFD,
+		0x6CBC2EB0, 0x6D7E4487, 0x6F38FADE, 0x6EFA90E9, 0x6BB5866C, 0x6A77EC5B, 0x68315202, 0x69F33835,
+		0x62AF7F08, 0x636D153F, 0x612BAB66, 0x60E9C151, 0x65A6D7D4, 0x6464BDE3, 0x662203BA, 0x67E0698D,
+		0x48D7CB20, 0x4915A117, 0x4B531F4E, 0x4A917579, 0x4FDE63FC, 0x4E1C09CB, 0x4C5AB792, 0x4D98DDA5,
+		0x46C49A98, 0x4706F0AF, 0x45404EF6, 0x448224C1, 0x41CD3244, 0x400F5873, 0x4249E62A, 0x438B8C1D,
+		0x54F16850, 0x55330267, 0x5775BC3E, 0x56B7D609, 0x53F8C08C, 0x523AAABB, 0x507C14E2, 0x51BE7ED5,
+		0x5AE239E8, 0x5B2053DF, 0x5966ED86, 0x58A487B1, 0x5DEB9134, 0x5C29FB03, 0x5E6F455A, 0x5FAD2F6D,
+		0xE1351B80, 0xE0F771B7, 0xE2B1CFEE, 0xE373A5D9, 0xE63CB35C, 0xE7FED96B, 0xE5B86732, 0xE47A0D05,
+		0xEF264A38, 0xEEE4200F, 0xECA29E56, 0xED60F461, 0xE82FE2E4, 0xE9ED88D3, 0xEBAB368A, 0xEA695CBD,
+		0xFD13B8F0, 0xFCD1D2C7, 0xFE976C9E, 0xFF5506A9, 0xFA1A102C, 0xFBD87A1B, 0xF99EC442, 0xF85CAE75,
+		0xF300E948, 0xF2C2837F, 0xF0843D26, 0xF1465711, 0xF4094194, 0xF5CB2BA3, 0xF78D95FA, 0xF64FFFCD,
+		0xD9785D60, 0xD8BA3757, 0xDAFC890E, 0xDB3EE339, 0xDE71F5BC, 0xDFB39F8B, 0xDDF521D2, 0xDC374BE5,
+		0xD76B0CD8, 0xD6A966EF, 0xD4EFD8B6, 0xD52DB281, 0xD062A404, 0xD1A0CE33, 0xD3E6706A, 0xD2241A5D,
+		0xC55EFE10, 0xC49C9427, 0xC6DA2A7E, 0xC7184049, 0xC25756CC, 0xC3953CFB, 0xC1D382A2, 0xC011E895,
+		0xCB4DAFA8, 0xCA8FC59F, 0xC8C97BC6, 0xC90B11F1, 0xCC440774, 0xCD866D43, 0xCFC0D31A, 0xCE02B92D,
+		0x91AF9640, 0x906DFC77, 0x922B422E, 0x93E92819, 0x96A63E9C, 0x976454AB, 0x9522EAF2, 0x94E080C5,
+		0x9FBCC7F8, 0x9E7EADCF, 0x9C381396, 0x9DFA79A1, 0x98B56F24, 0x99770513, 0x9B31BB4A, 0x9AF3D17D,
+		0x8D893530, 0x8C4B5F07, 0x8E0DE15E, 0x8FCF8B69, 0x8A809DEC, 0x8B42F7DB, 0x89044982, 0x88C623B5,
+		0x839A6488, 0x82580EBF, 0x801EB0E6, 0x81DCDAD1, 0x8493CC54, 0x8551A663, 0x8717183A, 0x86D5720D,
+		0xA9E2D0A0, 0xA820BA97, 0xAA6604CE, 0xABA46EF9, 0xAEEB787C, 0xAF29124B, 0xAD6FAC12, 0xACADC625,
+		0xA7F18118, 0xA633EB2F, 0xA4755576, 0xA5B73F41, 0xA0F829C4, 0xA13A43F3, 0xA37CFDAA, 0xA2BE979D,
+		0xB5C473D0, 0xB40619E7, 0xB640A7BE, 0xB782CD89, 0xB2CDDB0C, 0xB30FB13B, 0xB1490F62, 0xB08B6555,
+		0xBBD72268, 0xBA15485F, 0xB853F606, 0xB9919C31, 0xBCDE8AB4, 0xBD1CE083, 0xBF5A5EDA, 0xBE9834ED,
+	},
+	{
+		0x00000000, 0xB8BC6765, 0xAA09C88B, 0x12B5AFEE, 0x8F629757, 0x37DEF032, 0x256B5FDC, 0x9DD738B9,
+		0xC5B428EF, 0x7D084F8A, 0x6FBDE064, 0xD7018701, 0x4AD6BFB8, 0xF26AD8DD, 0xE0DF7733, 0x58631056,
+		0x5019579F, 0xE8A530FA, 0xFA109F14, 0x42ACF871, 0xDF7BC0C8, 0x67C7A7AD, 0x75720843, 0xCDCE6F26,
+		0x95AD7F70, 0x2D111815, 0x3FA4B7FB, 0x8718D09E, 0x1ACFE827, 0xA2738F42, 0xB0C620AC, 0x087A47C9,
+		0xA032AF3E, 0x188EC85B, 0x0A3B67B5, 0xB28700D0, 0x2F503869, 0x97EC5F0C, 0x8559F0E2, 0x3DE59787,
+		0x658687D1, 0xDD3AE0B4, 0xCF8F4F5A, 0x7733283F, 0xEAE41086, 0x525877E3, 0x40EDD80D, 0xF851BF68,
+		0xF02BF8A1, 0x48979FC4, 0x5A22302A, 0xE29E574F, 0x7F496FF6, 0xC7F50893, 0xD540A77D, 0x6DFCC018,
+		0x359FD04E, 0x8D23B72B, 0x9F9618C5, 0x272A7FA0, 0xBAFD4719, 0x0241207C, 0x10F48F92, 0xA848E8F7,
+		0x9B14583D, 0x23A83F58, 0x311D90B6, 0x89A1F7D3, 0x1476CF6A, 0xACCAA80F, 0xBE7F07E1, 0x06C36084,
+		0x5EA070D2, 0xE61C17B7, 0xF4A9B859, 0x4C15DF3C, 0xD1C2E785, 0x697E80E0, 0x7BCB2F0E, 0xC377486B,
+		0xCB0D0FA2, 0x73B168C7, 0x6104C729, 0xD9B8A04C, 0x446F98F5, 0xFCD3FF90, 0xEE66507E, 0x56DA371B,
+		0x0EB9274D, 0xB6054028, 0xA4B0EFC6, 0x1C0C88A3, 0x81DBB01A, 0x3967D77F, 0x2BD27891, 0x936E1FF4,
+		0x3B26F703, 0x839A9066, 0x912F3F88, 0x299358ED, 0xB4446054, 0x0CF80731, 0x1E4DA8DF, 0xA6F1CFBA,
+		0xFE92DFEC, 0x462EB889, 0x549B1767, 0xEC277002, 0x71F048BB, 0xC94C2FDE, 0xDBF98030, 0x6345E755,
+		0x6B3FA09C, 0xD383C7F9, 0xC1366817, 0x798A0F72, 0xE45D37CB, 0x5CE150AE, 0x4E54FF40, 0xF6E89825,
+		0xAE8B8873, 0x1637EF16, 0x048240F8, 0xBC3E279D, 0x21E91F24, 0x99557841, 0x8BE0D7AF, 0x335CB0CA,
+		0xED59B63B, 0x55E5D15E, 0x47507EB0, 0xFFEC19D5, 0x623B216C, 0xDA874609, 0xC832E9E7, 0x708E8E82,
+		0x28ED9ED4, 0x9051F9B1, 0x82E4565F, 0x3A58313A, 0xA78F0983, 0x1F336EE6, 0x0D86C108, 0xB53AA66D,
+		0xBD40E1A4, 0x05FC86C1, 0x1749292F, 0xAFF54E4A, 0x322276F3, 0x8A9E1196, 0x982BBE78, 0x2097D91D,
+		0x78F4C94B, 0xC048AE2E, 0xD2FD01C0, 0x6A4166A5, 0xF7965E1C, 0x4F2A3979, 0x5D9F9697, 0xE523F1F2,
+		0x4D6B1905, 0xF5D77E60, 0xE762D18E, 0x5FDEB6EB, 0xC2098E52, 0x7AB5E937, 0x680046D9, 0xD0BC21BC,
+		0x88DF31EA, 0x3063568F, 0x22D6F961, 0x9A6A9E04, 0x07BDA6BD, 0xBF01C1D8, 0xADB46E36, 0x15080953,
+		0x1D724E9A, 0xA5CE29FF, 0xB77B8611, 0x0FC7E174, 0x9210D9CD, 0x2AACBEA8, 0x38191146, 0x80A57623,
+		0xD8C66675, 0x607A0110, 0x72CFAEFE, 0xCA73C99B, 0x57A4F122, 0xEF189647, 0xFDAD39A9, 0x45115ECC,
+		0x764DEE06, 0xCEF18963, 0xDC44268D, 0x64F841E8, 0xF92F7951, 0x41931E34, 0x5326B1DA, 0xEB9AD6BF,
+		0xB3F9C6E9, 0x0B45A18C, 0x19F00E62, 0xA14C6907, 0x3C9B51BE, 0x842736DB, 0x96929935, 0x2E2EFE50,
+		0x2654B999, 0x9EE8DEFC, 0x8C5D7112, 0x34E11677, 0xA9362ECE, 0x118A49AB, 0x033FE645, 0xBB838120,
+		0xE3E09176, 0x5B5CF613, 0x49E959FD, 0xF1553E98, 0x6C820621, 0xD43E6144, 0xC68BCEAA, 0x7E37A9CF,
+		0xD67F4138, 0x6EC3265D, 0x7C7689B3, 0xC4CAEED6, 0x591DD66F, 0xE1A1B10A, 0xF3141EE4, 0x4BA87981,
+		0x13CB69D7, 0xAB770EB2, 0xB9C2A15C, 0x017EC639, 0x9CA9FE80, 0x241599E5, 0x36A0360B, 0x8E1C516E,
+		0x866616A7, 0x3EDA71C2, 0x2C6FDE2C, 0x94D3B949, 0x090481F0, 0xB1B8E695, 0xA30D497B, 0x1BB12E1E,
+		0x43D23E48, 0xFB6E592D, 0xE9DBF6C3, 0x516791A6, 0xCCB0A91F, 0x740CCE7A, 0x66B96194, 0xDE0506F1,
+	}
+};
+
+void crc_slice_init(crc_state *const s)
+{
+	s->crc0[0] = ~0;
+}
+
+// compute CRC32 (Slicing-by-4 algorithm)
+void crc_slice(crc_state *const s, const unsigned char *src, long len)
+{
+	uint32_t crc = s->crc0[0];
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	const uint32_t* current = (const uint32_t*)src;
+
+	// process four bytes at once (Slicing-by-4)
+	while (len >= 4)
+	{
+		uint32_t one = *current++ ^ crc;
+		crc = crc32_tab[0][(one >> 24) & 0xFF] ^
+			crc32_tab[1][(one >> 16) & 0xFF] ^
+			crc32_tab[2][(one >> 8) & 0xFF] ^
+			crc32_tab[3][one & 0xFF];
+
+		len -= 4;
+	}
+
+	// remaining 1 to 3 bytes (standard algorithm)
+	src = (uchar*)current;
+#endif
+
+	while (len-- != 0)
+	{
+		crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32_tab[0][(crc ^ *src++) & 0xFF];
+	}
+
+	s->crc0[0] = crc;
+}
+
+uint32_t crc_slice_finish(crc_state *const s)
+{
+	return ~s->crc0[0];
+}
+
+}
diff --git a/lib/yencode/YEncode.h b/lib/yencode/YEncode.h
index 774614a4..7b4c9538 100644
--- a/lib/yencode/YEncode.h
+++ b/lib/yencode/YEncode.h
@@ -28,10 +28,22 @@ namespace YEncode
 
 void init();
 extern size_t (*decode)(const unsigned char* inbuf, unsigned char* outbuf, size_t, char* state);
-extern size_t (*decode_simd)(const unsigned char* inbuf, unsigned char* outbuf, size_t, char* state);
 size_t decode_scalar(const unsigned char* src, unsigned char* dest, size_t len, char* state);
-extern uint32_t (*crc32_simd)(const unsigned char* src, long len);
-extern uint32_t (*inc_crc32_simd)(uint32_t crc, const unsigned char* src, long len);
+extern bool decode_simd;
+
+struct crc_state
+{
+#if defined(__i686__) || defined(__amd64__)
+	alignas(16) uint32_t crc0[4 * 5];
+#else
+	uint32_t crc0[1];
+#endif
+};
+
+extern void (*crc_init)(crc_state *const s);
+extern void (*crc_incr)(crc_state *const s, const unsigned char *src, long len);
+extern uint32_t (*crc_finish)(crc_state *const s);
+extern bool crc_simd;
 
 }
 
diff --git a/tests/postprocess/ParCheckerTest.cpp b/tests/postprocess/ParCheckerTest.cpp
index 632dfbbf..57a5d600 100644
--- a/tests/postprocess/ParCheckerTest.cpp
+++ b/tests/postprocess/ParCheckerTest.cpp
@@ -92,19 +92,18 @@ uint32 ParCheckerMock::CalcFileCrc(const char* filename)
 	REQUIRE(infile);
 
 	CharBuffer buffer(1024 * 64);
-	uint32 downloadCrc = 0xFFFFFFFF;
+	Crc32 downloadCrc;
 
 	int cnt = buffer.Size();
 	while (cnt == buffer.Size())
 	{
 		cnt = (int)fread(buffer, 1, buffer.Size(), infile);
-		downloadCrc = Util::Crc32m(downloadCrc, (uchar*)(char*)buffer, cnt);
+		downloadCrc.Append((uchar*)(char*)buffer, cnt);
 	}
 
 	fclose(infile);
 
-	downloadCrc ^= 0xFFFFFFFF;
-	return downloadCrc;
+	return downloadCrc.Finish();
 }
 
 TEST_CASE("Par-checker: repair not needed", "[Par][ParChecker][Slow][TestData]")