diff --git a/src/util/hei_bit_string.hpp b/src/util/hei_bit_string.hpp
new file mode 100755
index 0000000..cc1c073
--- /dev/null
+++ b/src/util/hei_bit_string.hpp
@@ -0,0 +1,406 @@
+#pragma once
+
+#include <prdf_types.h>
+
+namespace libhei
+{
+
+class BitStringBuffer;
+
+/** This type is used to take advantage of the most efficient memory reference
+ *  size for a specific CPU architecture. */
+typedef uint32_t CPU_WORD;
+
+//##############################################################################
+//                             BitString class
+//##############################################################################
+
+/**
+ * A BitString is general purpose class providing the ability to manipulate
+ * individual bits within an allocated section of contiguous memory.
+ *
+ * A BitString does not "own" the memory, it only accesses and manipulates the
+ * bits in the range specified. Users will need to ensure memory is allocated
+ * and deallocated appropriately. As an alternative, a BitStringBuffer is a
+ * BitString that will allocate and maintain its own memory.
+ *
+ * The length of a BitString is only limited by the amount of memory that
+ * contains the data buffer.
+ *
+ * The CPU_WORD type is used internally to reference memory and as the interface
+ * type for the field. Ensure that any buffer allocated for a BitString is
+ * CPU_WORD aligned so that the BitString does not accidentally access memory
+ * beyond availability. For example, say we have a buffer allocated for 6 byte
+ * (48 bits) and those 6 bytes are allocated at the very end of accessible
+ * memory. When the BitString tries to access the second CPU_WORD, which
+ * contains the last 2 bytes of the buffer, an expection will be thrown because
+ * the BitString always access an entire CPU_WORD (4 bytes) at a time and the
+ * last two bytes are not accessible. Utilize the static function
+ * getNumCpuWords() to get the minimum number of CPU_WORDs required to allocate
+ * sufficient space in the buffer. For example, getNumCpuWords(48) returns 2.
+ *
+ * The bit positions are ordered 0 to n (left to right), where n is the bit
+ * length minus one. By default, position 0 will be the first bit of the
+ * buffer's start address. The optional constructor allows users to input an
+ * offset anywhere within the buffer, which is then used as position 0. This is
+ * useful when the data within the buffer is a right-justified.
+ */
+class BitString
+{
+  public: // constants
+
+    /** Bit length of a CPU_WORD */
+    static const uint32_t CPU_WORD_BIT_LEN;
+
+    /** A CPU_WORD with all of the bits set to 1 */
+    static const CPU_WORD CPU_WORD_MASK;
+
+  public: // functions
+
+    /**
+     * @brief Constructor
+     * @param i_bitLen  The number of bits in the bit string.
+     * @param i_bufAddr The starting address of the memory buffer.
+     * @param i_offset  Optional input to indicate the actual starting position
+     *                  of the bit string within the memory buffer.
+     * @post  It is possible that i_bitLen + i_offset may not be CPU_WORD
+     *        aligned, however, the memory space allocated for i_bufAddr must be
+     *        CPU_WORD aligned to avoid functions in this class accessing memory
+     *        outside the available memory space. Use getNumCpuWords() to
+     *        calulate the number of CPU_WORDs needed to allocate sufficient
+     *        memory space.
+     */
+    BitString( uint32_t i_bitLen, CPU_WORD * i_bufAddr,
+               uint32_t i_offset = 0 ) :
+        iv_bitLen(i_bitLen), iv_bufAddr(i_bufAddr), iv_offset(i_offset)
+    {}
+
+    /** @brief Destructor */
+    virtual ~BitString() {}
+
+    /** @return The number of bits in the bit string buffer. */
+    uint32_t getBitLen() const { return iv_bitLen; }
+
+    /** @return The address of the bit string buffer. Note that this may
+     *          return nullptr. */
+    CPU_WORD * getBufAddr() const { return iv_bufAddr; }
+
+    /**
+     * @param i_bitLen The number of bits for a bit string.
+     * @param i_offset Optional starting position of the bit string within the
+     *                 memory buffer.
+     * @return The minimum number of CPU_WORDs required to allocate sufficient
+     *         memory space for a bit string.
+     */
+    static uint32_t getNumCpuWords( uint32_t i_bitLen, uint32_t i_offset = 0 )
+    {
+        return (i_bitLen + i_offset + CPU_WORD_BIT_LEN-1) / CPU_WORD_BIT_LEN;
+    }
+
+    /**
+     * @brief  Returns a left-justified value of the given length from the bit
+     *         string starting at the given position.
+     * @param  i_pos The starting position of the target range.
+     * @param  i_len The number of bits of the target range.
+     * @return The value of the field range specified (left-justified).
+     * @pre    nullptr != getBufAddr()
+     * @pre    0 < i_len
+     * @pre    i_len <= CPU_WORD_BIT_LEN
+     * @pre    i_pos + i_len <= getBitLen()
+     */
+    CPU_WORD getField( uint32_t i_pos, uint32_t i_len ) const;
+
+    /**
+     * @brief  Returns a right-justified value of the given length from the bit
+     *         string starting at the given position.
+     * @param  i_pos The starting position of the target range.
+     * @param  i_len The number of bits of the target range.
+     * @return The value of the field range specified (right-justified).
+     * @pre    nullptr != getBufAddr()
+     * @pre    0 < i_len
+     * @pre    i_len <= CPU_WORD_BIT_LEN
+     * @pre    i_pos + i_len <= getBitLen()
+     */
+    CPU_WORD getFieldJustify( uint32_t i_pos, uint32_t i_len ) const
+    {
+        return getField(i_pos, i_len) >> (CPU_WORD_BIT_LEN - i_len);
+    }
+
+    /**
+     * @brief  Sets a left-justified value of the given length into the bit
+     *         string starting at the given position.
+     * @param i_pos The starting position of the target range.
+     * @param i_len The number of bits of the target range.
+     * @param i_val The left-justified value to set.
+     * @pre   nullptr != getBufAddr()
+     * @pre   0 < i_len
+     * @pre   i_len <= CPU_WORD_BIT_LEN
+     * @pre   i_pos + i_len <= getBitLen()
+     */
+    void setField( uint32_t i_pos, uint32_t i_len, CPU_WORD i_val );
+
+    /**
+     * @brief  Sets a right-justified value of the given length into the bit
+     *         string starting at the given position.
+     * @param i_pos The starting position of the target range.
+     * @param i_len The number of bits of the target range.
+     * @param i_val The right-justified value to set.
+     * @pre   nullptr != getBufAddr()
+     * @pre   0 < i_len
+     * @pre   i_len <= CPU_WORD_BIT_LEN
+     * @pre   i_pos + i_len <= getBitLen()
+     */
+    void setFieldJustify( uint32_t i_pos, uint32_t i_len, CPU_WORD i_val )
+    {
+        setField( i_pos, i_len, i_val << (CPU_WORD_BIT_LEN - i_len) );
+    }
+
+    /**
+     * @param  i_pos The target position.
+     * @return True if the bit at the given position is set(1), false otherwise.
+     * @pre    i_pos < getBitLen().
+     */
+    bool isBitSet( uint32_t i_pos ) const { return 0 != getField(i_pos, 1); }
+
+    /**
+     * @brief Sets the target position to 1.
+     * @param i_pos The target position.
+     * @pre   i_pos < getBitLen().
+     */
+    void setBit( uint32_t i_pos ) { setFieldJustify( i_pos, 1, 1 ); }
+
+    /** @brief Sets the entire bit string to 1's. */
+    void setAll() { setPattern(CPU_WORD_MASK); }
+
+    /**
+     * @brief Sets the target position to 0.
+     * @param i_pos The target position.
+     * @pre   i_pos < getBitLen().
+     */
+    void clearBit( uint32_t i_pos ) { setFieldJustify( i_pos, 1, 0 ); }
+
+    /** @brief Sets the entire bit string to 0's. */
+    void clearAll() { setPattern(0); }
+
+    /**
+     * @brief Sets a range within the string based on the pattern and length
+     *        provided.
+     * @param i_sPos    Starting position of this string.
+     * @param i_sLen    The length of the target range.
+     * @param i_pattern The pattern to set (right justified).
+     * @param i_pLen    The length of the pattern.
+     * @pre   nullptr != getBufAddr()
+     * @pre   0 < i_sLen
+     * @pre   i_sPos + i_sLen <= getBitLen()
+     * @pre   0 < i_pLen <= CPU_WORD_BIT_LEN
+     * @post  The pattern is repeated/truncated as needed.
+     *
+     * Examples:  i_sPos(0), i_sLen(10), i_pattern(0xA), i_pLen(4)
+     *            Old String: 0000000000
+     *            New String: 1010101010
+     *
+     *            i_sPos(3), i_sLen(4), i_pattern(0x3), i_pLen(3)
+     *            Old String: 0001001000
+     *            New String: 0000110000
+     */
+    void setPattern( uint32_t i_sPos, uint32_t i_sLen,
+                     CPU_WORD i_pattern, uint32_t i_pLen );
+
+    /**
+     * @brief Sets entire string based on the pattern and length provided.
+     * @param i_pattern The pattern to set (right justified).
+     * @param i_pLen    The length of the pattern.
+     * @note  See definition above for prerequisites.
+     * @post  The entire string is filled with the pattern.
+     * @post  The pattern is repeated/truncated as needed.
+     */
+    void setPattern( CPU_WORD i_pattern, uint32_t i_pLen )
+    {
+        setPattern( 0, getBitLen(), i_pattern, i_pLen );
+    }
+
+    /**
+     * @brief Sets entire string based on the pattern provided (length of
+     *        CPU_WORD).
+     * @param i_pattern The pattern to set.
+     * @note  See definition above for prerequisites.
+     * @post  The entire string is filled with the pattern.
+     * @post  The pattern is repeated/truncated as needed.
+     */
+    void setPattern( CPU_WORD i_pattern )
+    {
+        setPattern( i_pattern, CPU_WORD_BIT_LEN );
+    }
+
+    /**
+     * @brief Set bits in this string based on the given string.
+     * @param i_sStr The source string.
+     * @param i_sPos The starting position of the source string.
+     * @param i_sLen The number of bits to copy from the source string.
+     * @param i_dPos The starting position of the this string.
+     * @pre   nullptr != getBufAddr()
+     * @pre   nullptr != i_sStr.getBufAddr()
+     * @pre   0 < i_sLen
+     * @pre   i_sPos + i_sLen <= i_sStr.getBitLen()
+     * @pre   i_dPos < getBitLen()
+     * @post  Source bits in given range are copied to this starting at i_dPos.
+     * @note  If the length of the given string is greater than the length of
+     *        this string, then the extra bits are ignored.
+     * @note  If the length of the given string is less than the length of this
+     *        string, then the extra bits in this string are not modified.
+     * @note  This string and the source string may specify overlapping memory.
+     */
+    void setString( const BitString & i_sStr, uint32_t i_sPos,
+                    uint32_t i_sLen, uint32_t i_dPos = 0 );
+
+    /**
+     * @brief Set bits in this string based on the provided string.
+     * @param i_sStr The source string.
+     * @note  This will try to copy as much of the source as possible to this
+     *        string, starting with the first bit in each string.
+     * @note  See the other definition of this function for details and
+     *        restrictions.
+     */
+    void setString( const BitString & i_sStr )
+    {
+        setString( i_sStr, 0, i_sStr.getBitLen() );
+    }
+
+    /**
+     * @brief Masks (clears) any bits set in this string that correspond to bits
+     *        set in the given string (this & ~mask).
+     * @param i_mask The mask string.
+     * @note  If the length of the given string is greater than the length of
+     *        this string, then the extra bits are ignored.
+     * @note  If the length of the given string is less than the length of this
+     *        string, then the extra bits in this string are not modified.
+     */
+    void maskString( const BitString & i_mask );
+
+    /**
+     * @param  i_str The string to compare.
+     * @return True if the strings are equivalent, false otherwise.
+     * @pre    Both strings must be of equal length and have same values to be
+     *         equal.
+     */
+    bool isEqual( const BitString & i_str ) const;
+
+    /** @return True if there are no bit set(1) in this bit string, false
+     *          otherwise. */
+    bool isZero() const;
+
+    /**
+     * @param  i_pos The starting position of the target range.
+     * @param  i_len The length of the target range.
+     * @return The number of bits that are set(1) in given range of this string.
+     * @pre    nullptr != getBufAddr()
+     * @pre    i_pos + i_len <= getBitLen()
+     */
+    uint32_t getSetCount( uint32_t i_pos, uint32_t i_len ) const;
+
+    /** @return The number of bits that are set(1) in this string. */
+    uint32_t getSetCount() const { return getSetCount( 0, getBitLen() ); }
+
+    /** @brief Comparison operator. */
+    bool operator==( const BitString & i_str ) const { return isEqual(i_str); }
+
+    /** @brief Bitwise NOT operator. */
+    BitStringBuffer operator~() const;
+
+    /** @brief Bitwise AND operator. */
+    BitStringBuffer operator&( const BitString & i_bs ) const;
+
+    /** @brief Bitwise OR operator. */
+    BitStringBuffer operator|( const BitString & i_bs ) const;
+
+    /** @brief Right shift operator. */
+    BitStringBuffer operator>>( uint32_t i_shift ) const;
+
+    /** @brief Left shift operator. */
+    BitStringBuffer operator<<( uint32_t i_shift ) const;
+
+  protected: // functions
+
+    /**
+     * @param i_newBufAddr The starting address of the new bit string buffer.
+     * @pre   Before calling this function, make sure you deallocate the old
+     *        buffer to avoid memory leaks.
+     */
+    void setBufAddr( CPU_WORD * i_newBufAddr ) { iv_bufAddr = i_newBufAddr; }
+
+    /** @param i_newBitLen The new bit length of this bit string buffer. */
+    void setBitLen( uint32_t i_newBitLen ) { iv_bitLen = i_newBitLen; }
+
+  private: // functions
+
+    // Prevent the assignment operator and copy constructor from a
+    // BitStringBuffer. While technically these could be done. We run into
+    // serious problems like with the operator functions above that all return
+    // a BitStringBuffer. If we allowed these, the BitString would end up
+    // pointing to memory that is no longer in context.
+    BitString & operator=( const BitStringBuffer & i_bsb );
+    BitString( const BitStringBuffer & i_bsb );
+
+    /**
+     * @brief  Given a bit position within the bit string, this function returns
+     *         the address that contains the bit position and the bit position
+     *         relative to that address.
+     * @param  o_relPos The returned relative position.
+     * @param  i_absPos The inputted absolute position.
+     * @return The relative address.
+     * @pre    nullptr != getBufAddr()
+     * @pre    i_absPos < getBitLen()
+     */
+    CPU_WORD * getRelativePosition( uint32_t & o_relPos,
+                                    uint32_t   i_absPos ) const;
+
+  private: // instance variables
+
+    uint32_t   iv_bitLen;  ///< The bit length of this buffer.
+    CPU_WORD * iv_bufAddr; ///< The beginning address of this buffer.
+    uint32_t   iv_offset;  ///< Start position offset
+};
+
+//##############################################################################
+//                          BitStringBuffer class
+//##############################################################################
+
+/** A BitStringBuffer is a BitString that maintains its own buffer in memory. It
+ *  guarantees that sufficient memory is allocated and deallocated in the
+ *  constructor and destructor, respectively. In addition, the assignment
+ *  operator will adjust the amount of memory needed, as necessary, for the
+ *  assignment. */
+class BitStringBuffer : public BitString
+{
+  public: // functions
+
+    /**
+     * @brief Constructor
+     * @param i_bitLen Number of bits in the string.
+     */
+    explicit BitStringBuffer( uint32_t i_bitLen );
+
+    /** @brief Destructor */
+    ~BitStringBuffer();
+
+    /** @brief Copy constructor from BitString */
+    BitStringBuffer( const BitString & i_bs );
+
+    /** @brief Copy constructor from BitStringBuffer */
+    BitStringBuffer( const BitStringBuffer & i_bsb );
+
+    /** @brief Assignment from BitString */
+    BitStringBuffer & operator=( const BitString & i_bs );
+
+    /** @brief Assignment from BitStringBuffer */
+    BitStringBuffer & operator=( const BitStringBuffer & i_bsb );
+
+  private: // functions
+
+    /** @brief Deallocates the old buffer, if needed, and initializes the new
+     *         buffer. */
+    void initBuffer();
+};
+
+} // end namespace libhei
+