diff --git a/src/core/platform.h b/src/core/platform.h
index 4d36dd4..0b63701 100644
--- a/src/core/platform.h
+++ b/src/core/platform.h
@@ -127,7 +127,7 @@
     #define OS					OS_ANDROID
 	#define IS_ANDROID          1
 	
-#elif defined(_LINUX)
+#elif defined(__linux__)
 	#define OS                  OS_LINUX
 	#define IS_LINUX 			1
 	
diff --git a/src/fco/signature.cpp b/src/fco/signature.cpp
index e3c9739..cee4240 100644
--- a/src/fco/signature.cpp
+++ b/src/fco/signature.cpp
@@ -98,28 +98,9 @@ iFCOProp::CmpResult iSignature::Compare(const iFCOProp* rhs, Op op) const
         return (op == iFCOProp::OP_NE) ? iFCOProp::CMP_TRUE : iFCOProp::CMP_FALSE;
 }
 
-bool  cArchiveSigGen::s_hex = false;
-int32 cArchiveSigGen::s_blocks = 1;
-int32 cArchiveSigGen::s_bytes = iSignature::SUGGESTED_BLOCK_SIZE;
-byte* cArchiveSigGen::s_buf = 0;
-byte* cArchiveSigGen::s_base = 0;
+bool  cArchiveSigGen::s_hex    = false;
 bool  cArchiveSigGen::s_direct = false;
 
-
-void cArchiveSigGen::SetBlocks( int32 n )
-{ 
-    cDebug d("cArchiveSigGen::SetBlocks");
-
-    s_blocks=n; 
-    d.TraceDebug("Num blocks = %u\n", s_blocks);
-    s_base = new byte[iSignature::SUGGESTED_BLOCK_SIZE * (s_blocks+2)]; 
-    unsigned long mod = (unsigned long)s_base % iSignature::SUGGESTED_BLOCK_SIZE;
-    unsigned long offset = (iSignature::SUGGESTED_BLOCK_SIZE - mod);
-    d.TraceDebug("mod = %u | offset = %u\n", mod, offset);
-    s_buf = s_base + offset;
-    s_bytes = iSignature::SUGGESTED_BLOCK_SIZE * s_blocks;
-}
-
 void cArchiveSigGen::AddSig( iSignature* pSig )
 {
     mSigList.push_back( pSig );
@@ -127,12 +108,18 @@ void cArchiveSigGen::AddSig( iSignature* pSig )
    
 void cArchiveSigGen::CalculateSignatures( cArchive& a )
 {
-    byte        abBuf[iSignature::SUGGESTED_BLOCK_SIZE];
+    byte        abBuf[iSignature::SUGGESTED_BLOCK_SIZE * 2];
     int         cbRead;
     container_type::size_type i;
+    byte*       pBuf = abBuf;
 
-    byte* pBuf = s_buf ? s_buf : abBuf;
-
+    if (s_direct)
+    {
+        unsigned long mod = (unsigned long)abBuf % iSignature::SUGGESTED_BLOCK_SIZE;
+        unsigned long offset = (iSignature::SUGGESTED_BLOCK_SIZE - mod);
+        pBuf = abBuf + offset;
+    }
+    
     // init hash
     for( i = 0; i < mSigList.size(); i++ )
         mSigList[i]->Init();
@@ -140,12 +127,12 @@ void cArchiveSigGen::CalculateSignatures( cArchive& a )
     // hash data
     do
     {
-        cbRead = a.ReadBlob( pBuf, s_bytes );
+        cbRead = a.ReadBlob( pBuf, iSignature::SUGGESTED_BLOCK_SIZE );
 
         for( i = 0; i < mSigList.size(); i++ )
             mSigList[i]->Update( pBuf, cbRead );
     }
-    while( cbRead == s_bytes );
+    while( cbRead == iSignature::SUGGESTED_BLOCK_SIZE );
 
     // finalize hash
     for( i = 0; i < mSigList.size(); i++ )
diff --git a/src/fco/signature.h b/src/fco/signature.h
index 5091cb7..c7d775c 100644
--- a/src/fco/signature.h
+++ b/src/fco/signature.h
@@ -156,7 +156,6 @@ public:
     static bool Hex();
     static void SetHex(bool);
     
-    static void SetBlocks( int32 n );
     static bool UseDirectIO() { return s_direct; }
     static void SetUseDirectIO( bool b ) { s_direct = b; }
 
@@ -168,12 +167,8 @@ private:
     typedef std::vector< iSignature* > container_type;
     container_type mSigList;
     
-    static bool  s_hex;
-    static int32 s_blocks;
-    static int32 s_bytes;
-    static byte* s_buf;
-    static byte* s_base;
     static bool  s_direct;
+    static bool  s_hex;
 };
 
 
diff --git a/src/tripwire/twcmdline.cpp b/src/tripwire/twcmdline.cpp
index 9e00492..5148423 100644
--- a/src/tripwire/twcmdline.cpp
+++ b/src/tripwire/twcmdline.cpp
@@ -444,7 +444,6 @@ static void FillOutConfigInfo(cTWModeCommon* pModeInfo, const cConfigFile& cf)
         pModeInfo->mbCrossFileSystems = false;
     }
 
-	int blocks = 0;
     if (cf.Lookup(TSTRING(_T("HASH_DIRECT_IO")), str))
     {
 #if SUPPORTS_DIRECT_IO
@@ -452,7 +451,6 @@ static void FillOutConfigInfo(cTWModeCommon* pModeInfo, const cConfigFile& cf)
         {
             pModeInfo->mbDirectIO = true;
             cArchiveSigGen::SetUseDirectIO(true);
-			blocks = 1;
         }
 #else
         throw eTWDirectIONotSupported();
@@ -460,15 +458,6 @@ static void FillOutConfigInfo(cTWModeCommon* pModeInfo, const cConfigFile& cf)
         
     }
     
-    if (cf.Lookup(TSTRING(_T("HASH_BLOCKS")), str))
-    {
-        int requested_blocks = _ttoi(str.c_str());
-        if (requested_blocks > 0)
-            blocks = requested_blocks;
-    }
-
-    if( blocks > 0 )
-        cArchiveSigGen::SetBlocks(blocks);
   // 
   // turn all of the file names into full paths (they're relative to the exe dir)
   //