diff --git a/UEFITool/uefitool.cpp b/UEFITool/uefitool.cpp
index 731dd5b..9ee66eb 100644
--- a/UEFITool/uefitool.cpp
+++ b/UEFITool/uefitool.cpp
@@ -159,8 +159,6 @@ void UEFITool::init()
     ui->actionToggleBootGuardMarking->setChecked(markingEnabled);
 
     // Connect
-    connect(ui->structureTreeView->selectionModel(), SIGNAL(currentChanged(const UModelIndex &, const UModelIndex &)),
-        this, SLOT(populateUi(const UModelIndex &)));
     connect(ui->structureTreeView->selectionModel(), SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
         this, SLOT(populateUi(const QItemSelection &)));
     connect(ui->parserMessagesListWidget,  SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(scrollTreeView(QListWidgetItem*)));
diff --git a/common/basetypes.h b/common/basetypes.h
index db77299..bb1ba4e 100644
--- a/common/basetypes.h
+++ b/common/basetypes.h
@@ -69,6 +69,7 @@ typedef size_t USTATUS;
 #define U_ELEMENTS_NOT_FOUND                47
 #define U_PEI_CORE_ENTRY_POINT_NOT_FOUND    48
 #define U_INVALID_STORE_SIZE                49
+#define U_UNKNOWN_COMPRESSION_ALGORITHM     50
 #define U_NOT_IMPLEMENTED                   0xFF
 
 // UDK porting definitions
diff --git a/common/ffsbuilder.cpp b/common/ffsbuilder.cpp
index 8319b30..1f45fba 100644
--- a/common/ffsbuilder.cpp
+++ b/common/ffsbuilder.cpp
@@ -1287,7 +1287,6 @@ USTATUS FfsBuilder::buildSection(const UModelIndex & index, const UINT32 base, U
         EFI_COMMON_SECTION_HEADER* commonHeader = (EFI_COMMON_SECTION_HEADER*)header.data();
         bool extended = false;
         UByteArray data = model->parsingData(index);
-        const COMPRESSED_SECTION_PARSING_DATA* compress_data = (const COMPRESSED_SECTION_PARSING_DATA*)data.constData();
 
         if (uint24ToUint32(commonHeader->Size) == 0xFFFFFF) {
             extended = true;
@@ -1327,17 +1326,26 @@ USTATUS FfsBuilder::buildSection(const UModelIndex & index, const UINT32 base, U
             }
 
             // Only this 2 sections can have compressed body
+            UINT8 compression = model->compressed(index) ? model->compression(index) : COMPRESSION_ALGORITHM_NONE;
             if (model->subtype(index) == EFI_SECTION_COMPRESSION) {
                 EFI_COMPRESSION_SECTION* compessionHeader = (EFI_COMPRESSION_SECTION*)header.data();
                 // Set new uncompressed size
                 compessionHeader->UncompressedLength = reconstructed.size();
                 // Compress new section body
                 UByteArray compressed;
-                result = compress(reconstructed, compress_data->algorithm, compressed);
+                result = compress(reconstructed, compression, compressed);
                 if (result)
                     return result;
+
                 // Correct compression type
-                compessionHeader->CompressionType = compress_data->compressionType;
+                if (compression == COMPRESSION_ALGORITHM_NONE)
+                    compessionHeader->CompressionType = EFI_NOT_COMPRESSED;
+                else if (compression == COMPRESSION_ALGORITHM_LZMA || compression == COMPRESSION_ALGORITHM_IMLZMA)
+                    compessionHeader->CompressionType = EFI_CUSTOMIZED_COMPRESSION;
+                else if (compression == COMPRESSION_ALGORITHM_EFI11 || compression == COMPRESSION_ALGORITHM_TIANO)
+                    compessionHeader->CompressionType = EFI_STANDARD_COMPRESSION;
+                else
+                    return U_UNKNOWN_COMPRESSION_ALGORITHM;
 
                 // Replace new section body
                 reconstructed = compressed;
@@ -1346,7 +1354,7 @@ USTATUS FfsBuilder::buildSection(const UModelIndex & index, const UINT32 base, U
                 EFI_GUID_DEFINED_SECTION* guidDefinedHeader = (EFI_GUID_DEFINED_SECTION*)header.data();
                 // Compress new section body
                 UByteArray compressed;
-                result = compress(reconstructed, compress_data->algorithm, compressed);
+                result = compress(reconstructed, compression, compressed);
                 if (result)
                     return result;
                 // Check for authentication status valid attribute
@@ -1377,7 +1385,7 @@ USTATUS FfsBuilder::buildSection(const UModelIndex & index, const UINT32 base, U
                 // Replace new section body
                 reconstructed = compressed;
             }
-            else if (compress_data->algorithm != COMPRESSION_ALGORITHM_NONE) {
+            else if (compression != COMPRESSION_ALGORITHM_NONE) {
                 msg(usprintf("buildSection: incorrectly required compression for section of type %1")
                     .arg(model->subtype(index)), index);
                 return U_INVALID_SECTION;
diff --git a/common/ffsparser.cpp b/common/ffsparser.cpp
index 359d3bb..5397ea0 100644
--- a/common/ffsparser.cpp
+++ b/common/ffsparser.cpp
@@ -2493,8 +2493,10 @@ USTATUS FfsParser::parseCompressedSectionBody(const UModelIndex & index)
     pdata.uncompressedSize = uncompressedSize;
     model->setParsingData(index, UByteArray((const char*)&pdata, sizeof(pdata)));
     
-    if (algorithm != COMPRESSION_ALGORITHM_NONE)
+    if (algorithm != COMPRESSION_ALGORITHM_NONE) {
         model->setCompressed(index, true);
+        model->setCompression(index, algorithm);
+    }
 
     // Parse decompressed data
     return parseSections(decompressed, index, true);
@@ -2571,8 +2573,10 @@ USTATUS FfsParser::parseGuidedSectionBody(const UModelIndex & index)
     model->addInfo(index, info);
 
     // Update data
-    if (algorithm != COMPRESSION_ALGORITHM_NONE)
+    if (algorithm != COMPRESSION_ALGORITHM_NONE) {
         model->setCompressed(index, true);
+        model->setCompression(index, algorithm);
+    }
 
     if (!parseCurrentSection) {
         msg(usprintf("%s: GUID defined section can not be processed", __FUNCTION__), index);
@@ -2614,32 +2618,38 @@ USTATUS FfsParser::parseDepexSectionBody(const UModelIndex & index)
 
     // Special cases of first opcode
     switch (*current) {
-    case EFI_DEP_BEFORE:
+    case EFI_DEP_BEFORE: {
         if (body.size() != 2 * EFI_DEP_OPCODE_SIZE + sizeof(EFI_GUID)) {
             msg(usprintf("%s: DEPEX section too long for a section starting with BEFORE opcode", __FUNCTION__), index);
             return U_SUCCESS;
         }
         guid = (const EFI_GUID*)(current + EFI_DEP_OPCODE_SIZE);
-        parsed += UString("\nBEFORE ") + guidToUString(*guid);
+        EFI_GUID tmpGuid;
+        memcpy(&tmpGuid, guid, sizeof(EFI_GUID));
+        parsed += UString("\nBEFORE ") + guidToUString(tmpGuid);
         current += EFI_DEP_OPCODE_SIZE + sizeof(EFI_GUID);
         if (*current != EFI_DEP_END){
             msg(usprintf("%s: DEPEX section ends with non-END opcode", __FUNCTION__), index);
             return U_SUCCESS;
         }
         return U_SUCCESS;
-    case EFI_DEP_AFTER:
+    }
+    case EFI_DEP_AFTER: {
         if (body.size() != 2 * EFI_DEP_OPCODE_SIZE + sizeof(EFI_GUID)){
             msg(usprintf("%s: DEPEX section too long for a section starting with AFTER opcode", __FUNCTION__), index);
             return U_SUCCESS;
         }
         guid = (const EFI_GUID*)(current + EFI_DEP_OPCODE_SIZE);
-        parsed += UString("\nAFTER ") + guidToUString(*guid);
+        EFI_GUID tmpGuid;
+        memcpy(&tmpGuid, guid, sizeof(EFI_GUID));
+        parsed += UString("\nAFTER ") + guidToUString(tmpGuid);
         current += EFI_DEP_OPCODE_SIZE + sizeof(EFI_GUID);
         if (*current != EFI_DEP_END) {
             msg(usprintf("%s: DEPEX section ends with non-END opcode", __FUNCTION__), index);
             return U_SUCCESS;
         }
         return U_SUCCESS;
+    }
     case EFI_DEP_SOR:
         if (body.size() <= 2 * EFI_DEP_OPCODE_SIZE) {
             msg(usprintf("%s: DEPEX section too short for a section starting with SOR opcode", __FUNCTION__), index);
@@ -2665,7 +2675,7 @@ USTATUS FfsParser::parseDepexSectionBody(const UModelIndex & index)
             msg(usprintf("%s: misplaced SOR opcode", __FUNCTION__), index);
             return U_SUCCESS;
         }
-        case EFI_DEP_PUSH:
+        case EFI_DEP_PUSH: {
             // Check that the rest of depex has correct size
             if ((UINT32)body.size() - (UINT32)(current - (const UINT8*)body.constData()) <= EFI_DEP_OPCODE_SIZE + sizeof(EFI_GUID)) {
                 parsed.clear();
@@ -2673,9 +2683,12 @@ USTATUS FfsParser::parseDepexSectionBody(const UModelIndex & index)
                 return U_SUCCESS;
             }
             guid = (const EFI_GUID*)(current + EFI_DEP_OPCODE_SIZE);
-            parsed += UString("\nPUSH ") + guidToUString(*guid);
+            EFI_GUID tmpGuid;
+            memcpy(&tmpGuid, guid, sizeof(EFI_GUID));
+            parsed += UString("\nPUSH ") + guidToUString(tmpGuid);
             current += EFI_DEP_OPCODE_SIZE + sizeof(EFI_GUID);
             break;
+        }
         case EFI_DEP_AND:
             parsed += UString("\nAND");
             current += EFI_DEP_OPCODE_SIZE;
diff --git a/common/nvramparser.cpp b/common/nvramparser.cpp
index 7bc86b3..5bed0d6 100644
--- a/common/nvramparser.cpp
+++ b/common/nvramparser.cpp
@@ -283,8 +283,10 @@ USTATUS NvramParser::parseNvarStore(const UModelIndex & index)
 
                 // The list begins at the end of the store and goes backwards
                 const EFI_GUID* guidPtr = (const EFI_GUID*)(data.constData() + data.size()) - 1 - guidIndex;
-                name = guidToUString(*guidPtr);
-                guid = guidToUString(*guidPtr, false);
+                EFI_GUID tmpGuid;
+                memcpy(&tmpGuid, guidPtr, sizeof(EFI_GUID));
+                name = guidToUString(tmpGuid);
+                guid = guidToUString(tmpGuid, false);
                 hasGuidIndex = true;
             }
 
@@ -365,7 +367,7 @@ USTATUS NvramParser::parseNvarStore(const UModelIndex & index)
 
         // Try parsing the entry data as NVAR storage if it begins with NVAR signature
         if ((subtype == Subtypes::DataNvarEntry || subtype == Subtypes::FullNvarEntry)
-            && *(const UINT32*)body.constData() == NVRAM_NVAR_ENTRY_SIGNATURE)
+            && body.size() >= 4 && *(const UINT32*)body.constData() == NVRAM_NVAR_ENTRY_SIGNATURE)
             parseNvarStore(varIndex);
 
         // Move to next exntry
diff --git a/common/treeitem.cpp b/common/treeitem.cpp
index 38d103a..93efaf7 100644
--- a/common/treeitem.cpp
+++ b/common/treeitem.cpp
@@ -32,6 +32,7 @@ TreeItem::TreeItem(const UINT32 offset, const UINT8 type, const UINT8 subtype,
     itemTail(tail),
     itemFixed(fixed),
     itemCompressed(compressed),
+    itemCompression(COMPRESSION_ALGORITHM_NONE),
     parentItem(parent)
 {
 }
@@ -98,4 +99,4 @@ TreeItem* TreeItem::child(int row)
     std::list<TreeItem*>::iterator child = childItems.begin();  
     std::advance(child, row); 
     return *child; 
-}
\ No newline at end of file
+}
diff --git a/common/treeitem.h b/common/treeitem.h
index 880e94a..7f1aac9 100644
--- a/common/treeitem.h
+++ b/common/treeitem.h
@@ -82,6 +82,9 @@ public:
     bool compressed() const { return itemCompressed; }
     void setCompressed(const bool compressed) { itemCompressed = compressed; }
 
+    bool compression() const { return itemCompression; }
+    void setCompression(const UINT8 compression) { itemCompression = compression; }
+
     UByteArray parsingData() const { return itemParsingData; };
     bool hasEmptyParsingData() const { return itemParsingData.isEmpty(); }
     void setParsingData(const UByteArray & pdata) { itemParsingData = pdata; }
@@ -104,6 +107,7 @@ private:
     UByteArray itemTail;
     bool       itemFixed;
     bool       itemCompressed;
+    UINT8      itemCompression;
     UByteArray itemParsingData;
     TreeItem*  parentItem;
 };
diff --git a/common/treemodel.cpp b/common/treemodel.cpp
index aa34478..9ee9838 100644
--- a/common/treemodel.cpp
+++ b/common/treemodel.cpp
@@ -284,6 +284,14 @@ bool TreeModel::compressed(const UModelIndex &index) const
     return item->compressed();
 }
 
+UINT8 TreeModel::compression(const UModelIndex &index) const
+{
+    if (!index.isValid())
+        return false;
+    TreeItem *item = static_cast<TreeItem*>(index.internalPointer());
+    return item->compression();
+}
+
 void TreeModel::setFixed(const UModelIndex &index, const bool fixed)
 {
     if (!index.isValid())
@@ -319,6 +327,17 @@ void TreeModel::setCompressed(const UModelIndex &index, const bool compressed)
     emit dataChanged(index, index);
 }
 
+void TreeModel::setCompression(const UModelIndex &index, const UINT8 compression)
+{
+    if (!index.isValid())
+        return;
+
+    TreeItem *item = static_cast<TreeItem*>(index.internalPointer());
+    item->setCompression(compression);
+
+    emit dataChanged(index, index);
+}
+
 void TreeModel::TreeModel::setMarkingEnabled(const bool enabled) 
 { 
     markingEnabledFlag = enabled;
diff --git a/common/treemodel.h b/common/treemodel.h
index cc62561..dfa5b12 100644
--- a/common/treemodel.h
+++ b/common/treemodel.h
@@ -152,6 +152,7 @@ public:
     void addInfo(const UModelIndex &index, const UString &info, const bool append = TRUE);
     void setFixed(const UModelIndex &index, const bool fixed);
     void setCompressed(const UModelIndex &index, const bool compressed);
+    void setCompression(const UModelIndex &index, const UINT8 compression);
     void setMarking(const UModelIndex &index, const UINT8 marking);
     
     UINT32 offset(const UModelIndex &index) const;
@@ -168,6 +169,7 @@ public:
     bool hasEmptyTail(const UModelIndex &index) const;
     bool fixed(const UModelIndex &index) const;
     bool compressed(const UModelIndex &index) const;
+    UINT8 compression(const UModelIndex &index) const;
     UINT8 marking(const UModelIndex &index) const;
     UINT8 action(const UModelIndex &index) const;
 
diff --git a/common/utility.cpp b/common/utility.cpp
index 0b2eb89..1bd527c 100644
--- a/common/utility.cpp
+++ b/common/utility.cpp
@@ -460,8 +460,7 @@ USTATUS compress(const UByteArray & data, const UINT8 algorithm, UByteArray & co
         break;
     default:
         //msg(usprintf("compress: unknown compression algorithm %1").arg(algorithm));
-        //return U_UNKNOWN_COMPRESSION_ALGORITHM;
-        return -1;
+        return U_UNKNOWN_COMPRESSION_ALGORITHM;
     }
 }