diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6652095
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.o
+crnlib/crunch
diff --git a/crnlib/crn_image_utils.cpp b/crnlib/crn_image_utils.cpp
index 409e675..0ffac1f 100644
--- a/crnlib/crn_image_utils.cpp
+++ b/crnlib/crn_image_utils.cpp
@@ -1305,7 +1305,7 @@ namespace crnlib
          *pActualComps = 0;
 
          if ((req_comps < 1) || (req_comps > 4))
-            return false;
+            return NULL;
 
          mipmapped_texture tex;
 
diff --git a/crnlib/crn_sparse_array.h b/crnlib/crn_sparse_array.h
index 62a93a7..f7c3fcf 100644
--- a/crnlib/crn_sparse_array.h
+++ b/crnlib/crn_sparse_array.h
@@ -355,7 +355,7 @@ namespace crnlib
 
       inline T* alloc_group(bool nofail = false)
       {
-         T* p = static_cast<T*>(alloc_space(N * sizeof(T)));
+         T* p = static_cast<T*>(this->alloc_space(N * sizeof(T)));
 
          if (!p)
          {
@@ -365,7 +365,7 @@ namespace crnlib
             CRNLIB_FAIL("Out of memory");
          }
 
-         construct_group(p);
+         this->construct_group(p);
 
          m_num_active_groups++;
 
@@ -379,20 +379,20 @@ namespace crnlib
             CRNLIB_ASSERT(m_num_active_groups);
             m_num_active_groups--;
 
-            destruct_group(p);
+            this->destruct_group(p);
 
-            free_space(p);
+            this->free_space(p);
          }
       }
 
       inline void init_default()
       {
-         construct_element(reinterpret_cast<T*>(m_default));
+         this->construct_element(reinterpret_cast<T*>(m_default));
       }
 
       inline void deinit_default()
       {
-         destruct_element(reinterpret_cast<T*>(m_default));
+         this->destruct_element(reinterpret_cast<T*>(m_default));
       }
    };
 
diff --git a/crnlib/crn_vector.cpp b/crnlib/crn_vector.cpp
index 8c21125..98931d6 100644
--- a/crnlib/crn_vector.cpp
+++ b/crnlib/crn_vector.cpp
@@ -21,7 +21,7 @@ namespace crnlib
       if (m_capacity >= min_new_capacity)
          return true;
 
-      size_t new_capacity = min_new_capacity;
+      uint new_capacity = min_new_capacity;
       if ((grow_hint) && (!math::is_power_of_2(new_capacity)))
          new_capacity = math::next_pow2(new_capacity);
 
diff --git a/crnlib/crnlib.cpp b/crnlib/crnlib.cpp
index ac485d0..682efad 100644
--- a/crnlib/crnlib.cpp
+++ b/crnlib/crnlib.cpp
@@ -172,7 +172,7 @@ void *crn_compress(const crn_comp_params &comp_params, crn_uint32 &compressed_si
    if (pActual_bitrate) *pActual_bitrate = 0.0f;
 
    if (!comp_params.check())
-      return false;
+      return NULL;
 
    crnlib::vector<uint8> crn_file_data;
    if (!create_compressed_texture(comp_params, crn_file_data, pActual_quality_level, pActual_bitrate))
@@ -189,7 +189,7 @@ void *crn_compress(const crn_comp_params &comp_params, const crn_mipmap_params &
    if (pActual_bitrate) *pActual_bitrate = 0.0f;
 
    if ((!comp_params.check()) || (!mip_params.check()))
-      return false;
+      return NULL;
 
    crnlib::vector<uint8> crn_file_data;
    if (!create_compressed_texture(comp_params, mip_params, crn_file_data, pActual_quality_level, pActual_bitrate))
@@ -456,4 +456,4 @@ bool crn_decompress_block(const void *pSrc_block, crn_uint32 *pDst_pixels_u32, c
    }
 
    return true;
-}
\ No newline at end of file
+}
diff --git a/inc/crn_decomp.h b/inc/crn_decomp.h
index 4d81928..680beb1 100644
--- a/inc/crn_decomp.h
+++ b/inc/crn_decomp.h
@@ -377,7 +377,11 @@ namespace crnd
 #ifdef _WIN64
    typedef uint64 ptr_bits;
 #else
-   typedef uint32 ptr_bits;
+   #ifdef __x86_64__
+      typedef uint64 ptr_bits;
+   #else
+      typedef uint32 ptr_bits;
+   #endif
 #endif
 
    template<typename T> struct int_traits { enum { cMin = crnd::cINT32_MIN, cMax = crnd::cINT32_MAX, cSigned = true }; };
@@ -2819,15 +2823,15 @@ namespace crnd
          *pSize = 0;
 
       if ((!pData) || (data_size < cCRNHeaderMinSize))
-         return false;
+         return NULL;
 
       crn_header tmp_header;
       const crn_header* pHeader = crnd_get_header(tmp_header, pData, data_size);
       if (!pHeader)
-         return false;
+         return NULL;
 
       if (level_index >= pHeader->m_levels)
-         return false;
+         return NULL;
 
       uint32 cur_level_ofs = pHeader->m_level_ofs[level_index];