diff --git a/Bin/LibD.pro b/Bin/LibD.pro
index bc198c7..e1f46f3 100644
--- a/Bin/LibD.pro
+++ b/Bin/LibD.pro
@@ -37,6 +37,7 @@ HEADERS += ../src/Actor/Player.h \
     ../src/Sprite/Sprite.h \
     ../src/System/Debug.h \
     ../src/System/ResourceManager.h \
+    ../src/System/Convert/str2int.h \
     ../src/System/Convert/ConvertType.h \
     ../src/System/Filesystem/InputStream.h \
     ../src/System/Filesystem/OutputStream.h \
@@ -100,6 +101,7 @@ SOURCES += ../src/Actor/Player.cpp \
     ../src/Math/FPS.cpp \
     ../src/Sprite/Sprite.cpp \
     ../src/System/Debug.cpp \
+    ../src/System/Convert/str2int.cpp \
     ../src/System/Filesystem/InputStream.cpp \
     ../src/System/Filesystem/OutputStream.cpp \
     ../src/System/Filesystem/FileList.cpp \
diff --git a/src/System/Convert/ConvertType.h b/src/System/Convert/ConvertType.h
new file mode 100644
index 0000000..ca93ad9
--- /dev/null
+++ b/src/System/Convert/ConvertType.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#ifndef INCLUDED_CASSERT
+#define INCLUSED_CASSERT
+#include <cassert>
+#endif
+
+namespace saracraft {
+namespace filesystem {
+
+template<class T>
+struct ConvertBase {
+  enum { charCount = sizeof(T) };
+  union Values {
+    unsigned char c[charCount];
+    T t;
+  };
+
+  Values value;
+
+  int GetSize(void) const { return charCount; }
+};
+
+template<class T>
+struct ConvertFrom: private ConvertBase<T> {
+  explicit ConvertFrom(const T& t) {
+    this->value.t = t;
+  }
+  using ConvertBase<T>::GetSize;
+
+  unsigned char GetByte(int index) const  {
+    assert((index >= 0) && (index < GetSize()));
+    return this->value.c[index];
+  }
+};
+
+template<class T>
+struct ConvertTo: private ConvertBase<T> {
+  using ConvertBase<T>::GetSize;
+
+  void SetByte(int index, unsigned char c) {
+    assert((index >= 0) && (index < GetSize()));
+    this->value.c[index] = c;
+  }
+
+  const T& GetValue(void) const {
+    return this->value.t;
+  }
+};
+
+typedef unsigned short uint16_t;
+
+} // Namespaces....
+}
+
diff --git a/src/System/Convert/str2int.cpp b/src/System/Convert/str2int.cpp
new file mode 100644
index 0000000..d512d2b
--- /dev/null
+++ b/src/System/Convert/str2int.cpp
@@ -0,0 +1,113 @@
+#include <string.h>
+#include "str2int.h"
+
+char convert_strbuf[16];
+
+// I'm presuming 32 bit int..
+
+int _last_str2int_errno = 0;
+
+char* int2str(int value) {
+  int tmp;
+  int expv;
+  int strpos = 0;
+
+  if(value < 0) {
+    convert_strbuf[0] = '-';
+    strpos++;
+    value = -value;
+  }
+
+  for(expv = 1000000000; expv > 1; expv /= 10) {
+    if((value / expv) != 0) break;
+  }
+
+  for( ; expv > 0; expv /= 10) {
+    tmp = (value/expv);
+    value -= tmp * expv;
+    convert_strbuf[strpos] = (char)('0' + tmp);
+    strpos++;
+  }
+  convert_strbuf[strpos] = '\0';
+  return convert_strbuf;
+}
+
+// Does not check for possible overflow..
+int str2int(const char* string) {
+  int i;
+  int len = strlen(string);
+  int value = 0;
+  int exp = 1;
+
+  if(len > 11) {
+    _last_str2int_errno = 1;
+    return 0;
+  }
+
+  for(i = len - 1; i >= 0; i--) {
+    if(string[i] >= '0' && string[i] <= '9') {
+      value+=(string[i] - '0') * exp;
+      exp *= 10;
+    } else {
+      if(i == 0) {
+        if(string[0] == '-') {
+          _last_str2int_errno = 0;
+          return -value;
+        }
+      }
+      _last_str2int_errno = 1;
+      return 0;
+    }
+  }
+  _last_str2int_errno = 0;
+  return value;
+}
+
+int str2int_errno(void) {
+  return _last_str2int_errno;
+}
+
+char* time2str(int secs) {
+  if(secs < 0) {
+    return "00:00:00";
+  }
+  int max_secs = 99 + 99*60 + 99*60*60;
+  if(secs > max_secs) {
+    secs = max_secs;
+  }
+
+  // Fill.
+  int hours = secs / 3600;
+  int mins = (secs - hours * 3600) / 60;
+  int sex = (secs - hours * 3600 - mins * 60);
+  int timeVal[3] = {hours, mins, sex};
+
+  int tmp;
+  int strpos = 0;
+
+  for(int i = 0; i < 3; i++) {
+    int value = timeVal[i];
+    if(value > 100) value = 99;
+
+    int expv = 10;
+    if((value / expv) == 0) {
+      expv = 1;
+      // Zero padding.
+      convert_strbuf[strpos] = '0';
+      strpos++;
+    }
+    for( ; expv > 0; expv /= 10) {
+      tmp = (value / expv);
+      value -= tmp * expv;
+      convert_strbuf[strpos] = (char)('0' + tmp);
+      strpos++;
+    }
+    if(i < 2) {
+      convert_strbuf[strpos] = ':';
+      strpos++;
+    }
+  }
+  convert_strbuf[strpos] = '\0';
+  return convert_strbuf;
+}
+
diff --git a/src/System/Convert/str2int.h b/src/System/Convert/str2int.h
new file mode 100644
index 0000000..1f6cece
--- /dev/null
+++ b/src/System/Convert/str2int.h
@@ -0,0 +1,7 @@
+#pragma once
+
+extern char* int2str(int value);
+extern int   str2int(const char* string);
+extern int   str2int_errno(void);
+extern char* time2str(int secs); // hh:mm::ss.
+
diff --git a/src/System/Filesystem/Checksum.cpp b/src/System/Filesystem/Checksum.cpp
new file mode 100644
index 0000000..bae9d07
--- /dev/null
+++ b/src/System/Filesystem/Checksum.cpp
@@ -0,0 +1,68 @@
+#include "Checksum.h"
+#include "InputStreamWrapper.h"
+#include <assert.h>
+#include <stdio.h>
+
+using namespace saracraft;
+
+unsigned int Checksum::CountChecksumForFile(const char* filename) {
+  unsigned int chksum = 0;
+  int filesize = 0;
+  bool success = CountChecksumForFileImpl(&chksum, &filesize, filename);
+  if(success) {
+    return chksum;
+  } else {
+    assert(0);
+    return 0;
+  }
+}
+
+bool Checksum::DoesChecksumAndSizeMatchFile(unsigned int checksum, int filesize, const char* filename) {
+  unsigned int chksum = 0;
+  int size = 0;
+  bool success = CountChecksumForFileImpl(&chksum, &size, filename);
+  if(success) {
+    if(chksum == checksum && filesize == size)
+      return true;
+    else
+      return false;
+  } else {
+    return false;
+  }
+}
+
+bool Checksum::CountChecksumForFileImpl(unsigned int* checksum, int* filesize, const char* filename) {
+  assert(filename != NULL);
+
+  filesystem::FB_FILE* f = filesystem::fb_fopen(filename, "rb");
+  if(f == NULL) {
+    return false;
+  }
+
+  int size = filesystem::fb_fsize(f);
+
+  char* buf = new char[size];
+
+  bool success = true;
+  int got = filesystem::fb_fread(buf, size, 1, f);
+  if(got != 1) {
+    success = false;
+  } else {
+    success = true;
+    *filesize = size;
+    unsigned int hashCode = 1327341033;
+    int hashmult = 0;
+    for(int i = 0; i < size; i++) {
+      if((i % 73) == 0)
+        hashCode += (buf[i] << hashmult);
+      else
+        hashCode ^= (buf[i] << hashmult);
+      hashmult+=4;
+      if(hashmult > 23) hashmult -= 23;
+    }
+    delete [] buf;
+    filesystem::fb_fclose(f);
+    return success;
+  }
+}
+
diff --git a/src/System/Filesystem/Checksum.h b/src/System/Filesystem/Checksum.h
new file mode 100644
index 0000000..7fce821
--- /dev/null
+++ b/src/System/Filesystem/Checksum.h
@@ -0,0 +1,12 @@
+#pragma once
+
+class Checksum {
+public:
+  static unsigned int CountChecksumForFile(const char* filename);
+  static bool DoesChecksumAndSizeMatchFile(unsigned int checksum, 
+                                      int filesize, const char* filename);
+private:
+  static bool CountChecksumForFileImpl(unsigned int* checksum, 
+                                      int* filesize, const char* filename);
+};
+
diff --git a/src/System/Filesystem/SCCopyFile.cpp b/src/System/Filesystem/SCCopyFile.cpp
new file mode 100644
index 0000000..c29eda4
--- /dev/null
+++ b/src/System/Filesystem/SCCopyFile.cpp
@@ -0,0 +1,23 @@
+#include <fstream>
+#include <string>
+#include "InputStream.h"
+#include "FilePackageManager.h"
+
+#include "SCCopyFile.h"
+
+namespace util {
+
+void SCCopyFile::CopyFile(const std::string& from, const std::string& to) {
+  std::fstream out(to.c_str(), std::ios::out);
+  saracraft::filesystem::InputStream in = saracraft::filesystem::FilePackageManager::GetInstance().GetFile(from);
+
+  std::string temp;
+  temp.resize(in.GetSize());
+  in.Read((unsigned char*)&temp[0], in.GetSize());
+  out << temp << std::endl;
+
+  out.close();
+}
+
+} // Namespace util.
+
diff --git a/src/System/Filesystem/SCCopyFile.h b/src/System/Filesystem/SCCopyFile.h
new file mode 100644
index 0000000..4c404a1
--- /dev/null
+++ b/src/System/Filesystem/SCCopyFile.h
@@ -0,0 +1,16 @@
+#pragma once
+
+namespace util {
+
+class SCCopyFile {
+public:
+
+  // TODO: This will currently only handle smallish text files
+  // propperly. 
+
+  /*** DON'T USE FOR BINARY FILES!!!! ***/
+  static void CopyFile(const std::string& from, const std::string& to);
+};
+
+} // Namespace util.
+