diff --git a/third_party/def_parser/def_parser.cc b/third_party/def_parser/def_parser.cc
index e96226a4b..07cb727b7 100644
--- a/third_party/def_parser/def_parser.cc
+++ b/third_party/def_parser/def_parser.cc
@@ -61,19 +61,24 @@
 * Author:   Valery Fine 16/09/96  (E-mail: fine@vxcern.cern.ch)
 *----------------------------------------------------------------------
 */
-#include "bindexplib.h"
+#include "src/main/cpp/util/file_platform.h"
+#include "third_party/def_parser/def_parser.h"
 
-#include "cmsys/Encoding.hxx"
-#include "cmsys/FStream.hxx"
+#include <algorithm>
 #include <iostream>
+#include <fstream>
+#include <sstream>
 #include <windows.h>
 
 #ifndef IMAGE_FILE_MACHINE_ARMNT
 #define IMAGE_FILE_MACHINE_ARMNT 0x01c4
 #endif
 
-typedef struct cmANON_OBJECT_HEADER_BIGOBJ
-{
+using std::string;
+using std::wstring;
+using std::stringstream;
+
+typedef struct cmANON_OBJECT_HEADER_BIGOBJ {
   /* same as ANON_OBJECT_HEADER_V2 */
   WORD Sig1;    // Must be IMAGE_FILE_MACHINE_UNKNOWN
   WORD Sig2;    // Must be 0xffff
@@ -92,13 +97,10 @@ typedef struct cmANON_OBJECT_HEADER_BIGOBJ
   DWORD NumberOfSymbols;
 } cmANON_OBJECT_HEADER_BIGOBJ;
 
-typedef struct _cmIMAGE_SYMBOL_EX
-{
-  union
-  {
+typedef struct _cmIMAGE_SYMBOL_EX {
+  union {
     BYTE ShortName[8];
-    struct
-    {
+    struct {
       DWORD Short; // if 0, use LongName
       DWORD Long;  // offset into string table
     } Name;
@@ -113,16 +115,14 @@ typedef struct _cmIMAGE_SYMBOL_EX
 typedef cmIMAGE_SYMBOL_EX UNALIGNED* cmPIMAGE_SYMBOL_EX;
 
 PIMAGE_SECTION_HEADER GetSectionHeaderOffset(
-  PIMAGE_FILE_HEADER pImageFileHeader)
-{
+  PIMAGE_FILE_HEADER pImageFileHeader) {
   return (PIMAGE_SECTION_HEADER)((DWORD_PTR)pImageFileHeader +
                                  IMAGE_SIZEOF_FILE_HEADER +
                                  pImageFileHeader->SizeOfOptionalHeader);
 }
 
 PIMAGE_SECTION_HEADER GetSectionHeaderOffset(
-  cmANON_OBJECT_HEADER_BIGOBJ* pImageFileHeader)
-{
+  cmANON_OBJECT_HEADER_BIGOBJ* pImageFileHeader) {
   return (PIMAGE_SECTION_HEADER)((DWORD_PTR)pImageFileHeader +
                                  sizeof(cmANON_OBJECT_HEADER_BIGOBJ));
 }
@@ -130,8 +130,7 @@ PIMAGE_SECTION_HEADER GetSectionHeaderOffset(
 /*
 + * Utility func, strstr with size
 + */
-const char* StrNStr(const char* start, const char* find, size_t& size)
-{
+const char* StrNStr(const char* start, const char* find, size_t& size) {
   size_t len;
   const char* hint;
 
@@ -157,9 +156,8 @@ template <
   class ObjectHeaderType,
   // cmPIMAGE_SYMBOL_EX or PIMAGE_SYMBOL
   class SymbolTableType>
-class DumpSymbols
-{
-public:
+class DumpSymbols {
+ public:
   /*
    *----------------------------------------------------------------------
    * Constructor --
@@ -169,11 +167,10 @@ public:
    *----------------------------------------------------------------------
    */
 
-  DumpSymbols(ObjectHeaderType* ih, std::set<std::string>& symbols,
-              std::set<std::string>& dataSymbols, bool isI386)
+  DumpSymbols(ObjectHeaderType* ih, std::set<string>& symbols,
+              std::set<string>& dataSymbols, bool isI386)
     : Symbols(symbols)
-    , DataSymbols(dataSymbols)
-  {
+    , DataSymbols(dataSymbols) {
     this->ObjectImageHeader = ih;
     this->SymbolTable =
       (SymbolTableType*)((DWORD_PTR) this->ObjectImageHeader +
@@ -190,7 +187,9 @@ public:
    *      Dump an object file's exported symbols.
    *----------------------------------------------------------------------
    */
-  void DumpObjFile() { this->DumpExternalsObjects(); }
+  void DumpObjFile() {
+    this->DumpExternalsObjects();
+  }
 
   /*
    *----------------------------------------------------------------------
@@ -199,11 +198,10 @@ public:
    *      Dumps a COFF symbol table from an OBJ.
    *----------------------------------------------------------------------
    */
-  void DumpExternalsObjects()
-  {
+  void DumpExternalsObjects() {
     unsigned i;
     PSTR stringTable;
-    std::string symbol;
+    string symbol;
     DWORD SectChar;
     /*
      * The string table apparently starts right after the symbol table
@@ -230,8 +228,8 @@ public:
           // if it starts with _ and has an @ then it is a __cdecl
           // so remove the @ stuff for the export
           if (symbol[0] == '_') {
-            std::string::size_type posAt = symbol.find('@');
-            if (posAt != std::string::npos) {
+            string::size_type posAt = symbol.find('@');
+            if (posAt != string::npos) {
               symbol.erase(posAt);
             }
           }
@@ -247,14 +245,14 @@ public:
           const char* scalarPrefix = "??_G";
           const char* vectorPrefix = "??_E";
           // The original code had a check for
-          //     symbol.find("real@") == std::string::npos)
+          //     symbol.find("real@") == string::npos)
           // but this disallows member functions with the name "real".
           if (symbol.compare(0, 4, scalarPrefix) &&
               symbol.compare(0, 4, vectorPrefix)) {
             SectChar = this->SectionHeaders[pSymbolTable->SectionNumber - 1]
                          .Characteristics;
             // skip symbols containing a dot
-            if (symbol.find('.') == std::string::npos) {
+            if (symbol.find('.') == string::npos) {
               if (!pSymbolTable->Type && (SectChar & IMAGE_SCN_MEM_WRITE)) {
                 // Read only (i.e. constants) must be excluded
                 this->DataSymbols.insert(symbol);
@@ -278,9 +276,9 @@ public:
     }
   }
 
-private:
-  std::set<std::string>& Symbols;
-  std::set<std::string>& DataSymbols;
+ private:
+  std::set<string>& Symbols;
+  std::set<string>& DataSymbols;
   DWORD_PTR SymbolCount;
   PIMAGE_SECTION_HEADER SectionHeaders;
   ObjectHeaderType* ObjectImageHeader;
@@ -288,35 +286,56 @@ private:
   bool IsI386;
 };
 
-bool DumpFile(const char* filename, std::set<std::string>& symbols,
-              std::set<std::string>& dataSymbols)
-{
+void PrintLastError() {
+  DWORD last_error = GetLastError();
+  if (last_error == 0) {
+    return;
+  }
+
+  char* message_buffer;
+  size_t size = FormatMessageA(
+      FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
+          FORMAT_MESSAGE_IGNORE_INSERTS,
+      NULL, last_error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+      (LPSTR)&message_buffer, 0, NULL);
+
+  std::cerr << "(error: " << last_error << "): " << message_buffer;
+  LocalFree(message_buffer);
+}
+
+bool DumpFile(const char* filename, std::set<string>& symbols,
+              std::set<string>& dataSymbols) {
   HANDLE hFile;
   HANDLE hFileMapping;
   LPVOID lpFileBase;
   PIMAGE_DOS_HEADER dosHeader;
 
-  hFile = CreateFileW(cmsys::Encoding::ToWide(filename).c_str(), GENERIC_READ,
+  wstring filenameW;
+  blaze_util::AsAbsoluteWindowsPath(filename, &filenameW);
+  hFile = CreateFileW(filenameW.c_str(), GENERIC_READ,
                       FILE_SHARE_READ, NULL, OPEN_EXISTING,
                       FILE_ATTRIBUTE_NORMAL, 0);
 
   if (hFile == INVALID_HANDLE_VALUE) {
+    PrintLastError();
     fprintf(stderr, "Couldn't open file '%s' with CreateFile()\n", filename);
     return false;
   }
 
   hFileMapping = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
   if (hFileMapping == 0) {
-    CloseHandle(hFile);
+    PrintLastError();
     fprintf(stderr, "Couldn't open file mapping with CreateFileMapping()\n");
+    CloseHandle(hFile);
     return false;
   }
 
   lpFileBase = MapViewOfFile(hFileMapping, FILE_MAP_READ, 0, 0, 0);
   if (lpFileBase == 0) {
+    PrintLastError();
+    fprintf(stderr, "Couldn't map view of file with MapViewOfFile()\n");
     CloseHandle(hFileMapping);
     CloseHandle(hFile);
-    fprintf(stderr, "Couldn't map view of file with MapViewOfFile()\n");
     return false;
   }
 
@@ -348,7 +367,7 @@ bool DumpFile(const char* filename, std::set<std::string>& symbols,
         (h->Machine == IMAGE_FILE_MACHINE_I386));
       symbolDumper.DumpObjFile();
     } else {
-      printf("unrecognized file format in '%s'\n", filename);
+      printf("Unrecognized file format in '%s'\n", filename);
       return false;
     }
   }
@@ -358,19 +377,23 @@ bool DumpFile(const char* filename, std::set<std::string>& symbols,
   return true;
 }
 
-bool bindexplib::AddObjectFile(const char* filename)
-{
+
+void DefParser::SetDLLName(const string& dllname) {
+  this->DLLName = dllname;
+}
+
+bool DefParser::AddObjectFile(const char* filename) {
   return DumpFile(filename, this->Symbols, this->DataSymbols);
 }
 
-bool bindexplib::AddDefinitionFile(const char* filename)
-{
-  cmsys::ifstream infile(filename);
+bool DefParser::AddDefinitionFile(const char* filename) {
+  std::ifstream infile(filename);
   if (!infile) {
+    PrintLastError();
     fprintf(stderr, "Couldn't open definition file '%s'\n", filename);
     return false;
   }
-  std::string str;
+  string str;
   while (std::getline(infile, str)) {
     // skip the LIBRAY and EXPORTS lines (if any)
     if ((str.compare(0, 7, "LIBRARY") == 0) ||
@@ -380,8 +403,8 @@ bool bindexplib::AddDefinitionFile(const char* filename)
     // remove leading tabs & spaces
     str.erase(0, str.find_first_not_of(" \t"));
     std::size_t found = str.find(" \t DATA");
-    if (found != std::string::npos) {
-      str.erase(found, std::string::npos);
+    if (found != string::npos) {
+      str.erase(found, string::npos);
       this->DataSymbols.insert(str);
     } else {
       this->Symbols.insert(str);
@@ -391,14 +414,37 @@ bool bindexplib::AddDefinitionFile(const char* filename)
   return true;
 }
 
-void bindexplib::WriteFile(FILE* file)
-{
+bool DefParser::IsDefFile(const string& file) {
+  // Get file extension and convert it to lower case.
+  string ext = file.substr(file.find_last_of(".") + 1);
+  std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower);
+  return ext == "def";
+}
+
+bool DefParser::AddFile(const string& file) {
+  if (IsDefFile(file)) {
+    if (!this->AddDefinitionFile(file.c_str())) {
+      return false;
+    }
+  } else {
+    if (!this->AddObjectFile(file.c_str())) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void DefParser::WriteFile(FILE* file) {
+  if (!this->DLLName.empty()) {
+    fprintf(file, "LIBRARY %s\n", this->DLLName.c_str());
+  }
+
   fprintf(file, "EXPORTS \n");
-  for (std::set<std::string>::const_iterator i = this->DataSymbols.begin();
+  for (std::set<string>::const_iterator i = this->DataSymbols.begin();
        i != this->DataSymbols.end(); ++i) {
     fprintf(file, "\t%s \t DATA\n", i->c_str());
   }
-  for (std::set<std::string>::const_iterator i = this->Symbols.begin();
+  for (std::set<string>::const_iterator i = this->Symbols.begin();
        i != this->Symbols.end(); ++i) {
     fprintf(file, "\t%s\n", i->c_str());
   }