diff --git a/IffFile.cc b/IffFile.cc
index 490b2b8..f939eac 100644
--- a/IffFile.cc
+++ b/IffFile.cc
@@ -9,13 +9,13 @@ struct ChunkHeader {
   uint32_t length;
 };
 
-IffFile::IffFile(uint8_t const* base, size_t length)
-  : base_(base), length_(length)
+IffFile::IffFile(Resource const& res)
+  : res_(res)
 {
   size_t pos = 0;
-  while (pos < length) {
-    roots_.push_back(parseObject(base+pos, length-pos));
-    pos += roots_.back()->getSize() + 8;
+  while (pos < res_.size()) {
+    roots_.push_back(parseObject(res_.data()+pos, res_.size()-pos));
+    pos += roots_.back()->size() + 8;
   }
 }
 
@@ -27,7 +27,7 @@ static void _printStructure(IffFile::Object const& obj, unsigned level)
 {
   for (unsigned i = 0;i < level;++i)
     putchar('\t');
-  printf("%s Length %lu (0x%.lx)", obj.getType().c_str(), obj.getSize(), obj.getSize());
+  printf("%s Length %lu (0x%.lx)", obj.getType().c_str(), obj.size(), obj.size());
   
   if (obj.isForm()) {
     auto& form = dynamic_cast<IffFile::Form const&>(obj);
@@ -129,7 +129,7 @@ IffFile::Form::Form(std::string type, uint8_t const* base, size_t length)
   size_t pos = 4;
   while (pos+8 < length) {
     children_.push_back(parseObject(base+pos, length-pos));
-    pos += 8 + children_.back()->getSize();
+    pos += 8 + children_.back()->size();
     
     if (pos%2 != 0)
       ++pos;
diff --git a/IffFile.hh b/IffFile.hh
index 4a70da7..b21bbb6 100644
--- a/IffFile.hh
+++ b/IffFile.hh
@@ -7,9 +7,11 @@
 #include <memory>
 #include <typeinfo>
 
+#include "Resource.hh"
+
 class IffFile {
 public:
-  IffFile(uint8_t const* base, size_t length);
+  IffFile(Resource const& res);
 
   ~IffFile();
 
@@ -109,12 +111,12 @@ public:
     std::vector<std::unique_ptr<Object> >::const_iterator implIt_;
   };
   
-  class Object {
+  class Object : public Resource {
   public:
     Object(std::string type, uint8_t const* base, size_t length);
     Object(Object const& copy) = delete;
    
-    virtual ~Object() {
+    ~Object() override {
     }
 
     std::string const& getType() const {
@@ -125,10 +127,14 @@ public:
       return (typeid(*this) == typeid(Form));
     }
     
-    size_t getSize() const {
+    size_t size() const override {
       return length_;
     }
 
+    uint8_t const* data() const override {
+      return base_;
+    }
+
     uint8_t const* begin() const {
       return base_;
     }
@@ -138,6 +144,10 @@ public:
     }
 
     operator std::string() const;
+
+    operator bool() const override {
+      return true;
+    }
     
   protected:
     uint8_t const* base_;
@@ -188,8 +198,7 @@ public:
 private:
   static std::unique_ptr<Object> parseObject(uint8_t const* base, size_t length);
   
-  uint8_t const* base_;
-  const size_t length_;
+  Resource const& res_;
   std::vector<std::unique_ptr<Object> > roots_;
 };
 
diff --git a/MveDecoder.cc b/MveDecoder.cc
index c314a02..8aec29c 100644
--- a/MveDecoder.cc
+++ b/MveDecoder.cc
@@ -8,8 +8,8 @@
 #include "decompress.hh"
 #include "MveDecoder.hh"
 
-MveDecoder::MveDecoder(uint8_t const* base, size_t length)
-  : iff_(base, length), width_(320), height_(165)
+MveDecoder::MveDecoder(Resource const& res)
+  : iff_(res), width_(320), height_(165)
 {
   //iff_.printStructure();
 
@@ -26,7 +26,7 @@ MveDecoder::MveDecoder(uint8_t const* base, size_t length)
   // Parse _PC_ chunk
   auto& PC = *it++;
   if ((PC.getType() != "_PC_") ||
-      (PC.getSize() != 12))
+      (PC.size() != 12))
     throw FormatException{"_PC_ chunk missing or wrong size"};
 
   const uint32_t PC_PALTcount = readU32LE(PC.begin()+8);
@@ -37,7 +37,7 @@ MveDecoder::MveDecoder(uint8_t const* base, size_t length)
   // // Parse SOND chunk
   // auto& SOND = *it++;
   // if ((SOND.getType() != "SOND") ||
-  //     (SOND.getSize() != 4))
+  //     (SOND.size() != 4))
   //   throw FormatException{"SOND chunk missing or wrong size"};
 
   // const uint32_t  SONDc = readU32LE(SOND.begin());
@@ -53,7 +53,7 @@ MveDecoder::MveDecoder(uint8_t const* base, size_t length)
   
   for (;it != rootForm.childrenEnd();++it) {
     if (it->getType() == "SIZE") {
-      if (it->getSize() != 8)
+      if (it->size() != 8)
 	throw FormatException{"Unexpected SIZE size"};
 
       width_ = readU32LE(it->begin());
@@ -61,7 +61,7 @@ MveDecoder::MveDecoder(uint8_t const* base, size_t length)
     } else if (it->getType() == "PALT") {
       if (curPALT > PC_PALTcount)
 	throw FormatException{"Number of PALT chunks exceeds amount specified in _PC_"};
-      if (it->getSize() != 768)
+      if (it->size() != 768)
 	throw FormatException{"Unexpected PALT size"};
       palts_.emplace_back();
       
@@ -95,11 +95,11 @@ MveDecoder::MveDecoder(uint8_t const* base, size_t length)
 	throw FormatException{"INDX after SHOT"};
       haveIndex = true;
 
-      for(unsigned i = 0;i < it->getSize()/4;++i)
+      for(unsigned i = 0;i < it->size()/4;++i)
 	branches.push_back(readU32LE(it->begin()+i*4));
       branches_.resize(branches.size());
     } else if (it->getType() == "BRCH") {
-      size_t ofs = it->begin()-base-8;
+      size_t ofs = it->begin()-res.data()-8;
       auto idxIt = std::find(branches.begin(), branches.end(), ofs);
       if (idxIt == branches.end())
 	throw FormatException{"Could not resolve branch " + std::to_string(ofs)};
@@ -276,13 +276,13 @@ unsigned MveDecoder::Movie::getHeight() const
 void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
 {
   // Parse header
-  if (vga.getSize() < 8)
+  if (vga.size() < 8)
     throw FormatException{"VGA chunk smaller than VGA header"};
   
   std::array<uint16_t, 4> segOfs;
   for(unsigned i = 0;i < segOfs.size();++i) {
     segOfs[i] = readU16LE(vga.begin()+i*2);
-    if (segOfs[i] >= vga.getSize())
+    if (segOfs[i] >= vga.size())
       throw FormatException{"Segment offset exceeds chunk"};
   }
 
@@ -291,7 +291,7 @@ void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
       ((segOfs[1] && (segOfs[1] - segOfs[0]) < 45)) ||
       ((segOfs[2] && (segOfs[2] - segOfs[0]) < 45)) ||
       ((segOfs[3] && (segOfs[3] - segOfs[0]) < 45)) ||
-      (vga.getSize() - segOfs[0] < 45))
+      (vga.size() - segOfs[0] < 45))
     throw FormatException{"Segment 1 too small"};
 
   commandBuf_.clear();
@@ -301,7 +301,7 @@ void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
 
   size_t pixelCount = 0;
   if (segOfs[3]) {
-    pixelCount = parsePixels_(vga.begin()+segOfs[3], vga.getSize()-segOfs[3],
+    pixelCount = parsePixels_(vga.begin()+segOfs[3], vga.size()-segOfs[3],
 			      pixelBuf_.data(), pixelBuf_.size());
     maxPixel_ = std::max(maxPixel_, pixelCount);
   }
@@ -309,7 +309,7 @@ void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
 #ifdef VIDDEBUG_
   printf("%lu commands, %lu pixel data, %u mvecs, %lu size data\n",
 	 commands.size(), pixels.size(), (segOfs[2]?(segOfs[3]-segOfs[2]):0),
-	 segOfs[2]?(segOfs[2]-segOfs[1]):(segOfs[3]?(segOfs[3]-segOfs[1]):(vga.getSize()-segOfs[1])));
+	 segOfs[2]?(segOfs[2]-segOfs[1]):(segOfs[3]?(segOfs[3]-segOfs[1]):(vga.size()-segOfs[1])));
 #endif
   
   // Interpret command stream to render frame
@@ -352,7 +352,7 @@ void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
       if (!segOfs[1] ||
 	  (segOfs[2] && (segOfs[1]+seg2Idx >= segOfs[2])) ||
 	  (segOfs[3] && (segOfs[1]+seg2Idx >= segOfs[3])) ||
-	  (segOfs[1]+seg2Idx >= vga.getSize()))
+	  (segOfs[1]+seg2Idx >= vga.size()))
 	throw FormatException{"Segment 2 overrun"};
       size = vga.begin()[segOfs[1]+seg2Idx++]&0xff;
       break;
@@ -361,7 +361,7 @@ void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
       if (!segOfs[1] ||
 	  (segOfs[2] && (segOfs[1]+seg2Idx+1 >= segOfs[2])) ||
 	  (segOfs[3] && (segOfs[1]+seg2Idx >= segOfs[3])) ||
-	  (segOfs[1]+seg2Idx+1 >= vga.getSize()))
+	  (segOfs[1]+seg2Idx+1 >= vga.size()))
 	throw FormatException{"Segment 2 overrun"};
       size = readU16BE(vga.begin()+segOfs[1]+seg2Idx);
       seg2Idx += 2;
@@ -371,7 +371,7 @@ void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
       if (!segOfs[1] ||
 	  (segOfs[2] && (segOfs[1]+seg2Idx+2 >= segOfs[2])) ||
 	  (segOfs[3] && (segOfs[1]+seg2Idx >= segOfs[3])) ||
-	  (segOfs[1]+seg2Idx+2 >= vga.getSize()))
+	  (segOfs[1]+seg2Idx+2 >= vga.size()))
 	throw FormatException{"Segment 2 overrun"};
       size = readU24BE(vga.begin()+segOfs[1]+seg2Idx);
       seg2Idx += 3;
@@ -410,7 +410,7 @@ void MveDecoder::Movie::parseVGA(IffFile::Object const& vga)
 #endif
       if (!segOfs[2] ||
 	  (segOfs[3] && (segOfs[2]+seg3Idx > segOfs[3])) ||
-	  (segOfs[2]+seg3Idx > vga.getSize()))
+	  (segOfs[2]+seg3Idx > vga.size()))
 	throw FormatException{"Segment 3 overrun"};
      
       const uint8_t mpos = vga.begin()[segOfs[2]+seg3Idx++];
@@ -467,7 +467,7 @@ void audioCB_(void* userdata, uint8_t *buf, int len)
   }
   
   while ((len > 0) && cbdata->cur) {
-    if (cbdata->pos >= (*cbdata->aCur)->getSize()) {
+    if (cbdata->pos >= (*cbdata->aCur)->size()) {
       cbdata->pos = 0;
       ++cbdata->aCur;
       if (cbdata->aCur == cbdata->cur->AUDIs.end()) {
@@ -484,8 +484,8 @@ void audioCB_(void* userdata, uint8_t *buf, int len)
     
     auto& aCur = *cbdata->aCur;
     size_t toCopy = len;
-    if (cbdata->pos+toCopy > aCur->getSize())
-      toCopy = aCur->getSize()-cbdata->pos;
+    if (cbdata->pos+toCopy > aCur->size())
+      toCopy = aCur->size()-cbdata->pos;
     std::copy(aCur->begin()+cbdata->pos, aCur->begin()+cbdata->pos+toCopy,
 	      buf);
     len -= toCopy;
diff --git a/MveDecoder.hh b/MveDecoder.hh
index 286d422..d3d3aa3 100644
--- a/MveDecoder.hh
+++ b/MveDecoder.hh
@@ -6,9 +6,11 @@
 
 #include "IffFile.hh"
 
+class Resource;
+
 class MveDecoder {
 public:
-  MveDecoder(uint8_t const* base, size_t length);
+  MveDecoder(Resource const& res);
 
   size_t numBranches() const {
     return branches_.size();
diff --git a/ObjDecoder.cc b/ObjDecoder.cc
index 0ea0c76..d3358a3 100644
--- a/ObjDecoder.cc
+++ b/ObjDecoder.cc
@@ -4,8 +4,8 @@
 #include "exceptions.hh"
 #include "util.hh"
 
-ObjDecoder::ObjDecoder(uint8_t const* base, size_t length)
-  : iff_(base, length)
+ObjDecoder::ObjDecoder(Resource const& res)
+  : iff_(res)
 {
   auto& root = iff_.getRoot();
   if (!root.isForm())
@@ -17,7 +17,7 @@ ObjDecoder::ObjDecoder(uint8_t const* base, size_t length)
 
   for (auto realIt = rootForm.childrenBegin();realIt != rootForm.childrenEnd();++realIt) {
     if (realIt->getType() == "INFO") {
-      name_ = *realIt;
+      name_ = static_cast<std::string>(*realIt);
       printf("Name: \"%s\"\n", name_.c_str());
     } else if (realIt->isForm()) {
       auto& itForm = dynamic_cast<IffFile::Form const&>(*realIt);
@@ -79,9 +79,9 @@ void ObjDecoder::parsePOLY_(IffFile::Form const& form)
   for (auto it = form.childrenBegin();it != form.childrenEnd();++it) {
     if (it->getType() == "INFO") {
     } else if (it->getType() == "VERT") {
-      if (it->getSize()%12 != 0)
+      if (it->size()%12 != 0)
 	throw FormatException{"Unexpected VERT size"};
-      for (size_t i = 0;i < it->getSize();i+=12) {
+      for (size_t i = 0;i < it->size();i+=12) {
 	std::array<int32_t, 3> vertex;
 	for (size_t j = 0;j < 3;++j)
 	  vertex[j] = readU32LE(it->begin()+i+j*4);
@@ -137,10 +137,10 @@ void ObjDecoder::parseTRIS_(IffFile::Form const& form)
 
   assert(face && maps);
 
-  if (face->getSize()%8 != 0)
+  if (face->size()%8 != 0)
     throw FormatException{"Unexpected FACE size"};
-  auto numTriangles = face->getSize()/8;
-  if (maps->getSize() != numTriangles*16)
+  auto numTriangles = face->size()/8;
+  if (maps->size() != numTriangles*16)
     printf("WARNING: Unexpected MAPS size\n");
      //   throw FormatException{"Unexpected MAPS size"};
 
@@ -185,10 +185,10 @@ void ObjDecoder::parseQUAD_(IffFile::Form const& form)
 
   assert(face && maps);
 
-  if (face->getSize()%10 != 0)
+  if (face->size()%10 != 0)
     throw FormatException{"Unexpected FACE size"};
-  auto numQuads = face->getSize()/10;
-  if (maps->getSize() != numQuads*20)
+  auto numQuads = face->size()/10;
+  if (maps->size() != numQuads*20)
     printf("WARNING: Unexpected MAPS size\n");
   //throw FormatException{"Unexpected MAPS size"};
 
@@ -225,12 +225,12 @@ void ObjDecoder::parseDETA_(IffFile::Form const& form)
     if (std::stoi(it->getType().substr(3)) != lvl)
       throw FormatException{"Unexpected detail level"};
 
-    if (it->getSize() < 4)
+    if (it->size() < 4)
       throw FormatException{"DETA child too small"};
     
     // uint32_t unkown = readU32LE(it->begin());
     detailLevels_.emplace_back();
-    for (size_t pos = 4;pos < it->getSize()-1;pos += 2)
+    for (size_t pos = 4;pos < it->size()-1;pos += 2)
       detailLevels_.back().push_back(readU16LE(it->begin()+pos));
 
     printf("LVL %u: %lu entries\n", lvl, detailLevels_.back().size());
@@ -250,7 +250,7 @@ void ObjDecoder::parseTXMS_(IffFile::Form const& form)
   auto& info = *it++;
   if (info.getType() != "INFO")
     throw FormatException{"Missing INFO in TXMS"};
-  if (info.getSize() != 4)
+  if (info.size() != 4)
     throw FormatException{"Unexpected INFO size in TXMS"};
   
   uint16_t numTXMP, numTXMA;
@@ -263,7 +263,7 @@ void ObjDecoder::parseTXMS_(IffFile::Form const& form)
   texAnims_.reserve(numTXMA);
   for (;it != form.childrenEnd();++it) {
     if (it->getType() == "TXMP") {
-      if (it->getSize() < 12u)
+      if (it->size() < 12u)
 	throw FormatException{"TXMP smaller than header"};
       
       Texture tex;
@@ -277,12 +277,12 @@ void ObjDecoder::parseTXMS_(IffFile::Form const& form)
       tex.height = readU16LE(it->begin()+10);
       printf("TXMP size %hux%hu\n", tex.width, tex.height);
       
-      if (it->getSize() < 12u+tex.width*tex.height)
+      if (it->size() < 12u+tex.width*tex.height)
 	throw FormatException{"TXMP too small for pixel data"};
       tex.pixels = std::vector<uint8_t>(it->begin()+12, it->begin()+12+tex.width*tex.height);
       textures_.emplace_back(std::move(tex));
     } else if (it->getType() == "TXMA") {
-      if (it->getSize() < 14u)
+      if (it->size() < 14u)
 	throw FormatException{"TXMA smaller than header"};
       
       TextureAnimation tex;
@@ -297,7 +297,7 @@ void ObjDecoder::parseTXMS_(IffFile::Form const& form)
       tex.frames = readU16LE(it->begin()+12);
       printf("TXMA size %hux%hu, %hu frames\n", tex.width, tex.height, tex.frames);
 
-      if (it->getSize() < 14u+tex.width*tex.height*tex.frames)
+      if (it->size() < 14u+tex.width*tex.height*tex.frames)
 	throw FormatException{"TXMA too small for pixel data"};
 
       tex.pixels.reserve(tex.frames);
diff --git a/ObjDecoder.hh b/ObjDecoder.hh
index 5e2a67c..bfb4625 100644
--- a/ObjDecoder.hh
+++ b/ObjDecoder.hh
@@ -8,9 +8,11 @@
 
 #include "IffFile.hh"
 
+class Resource;
+
 class ObjDecoder {
 public:
-  ObjDecoder(uint8_t const* base, size_t length);
+  ObjDecoder(Resource const& res);
 
   using Vertex = std::array<int32_t, 3>;
   using Vertices = std::vector<Vertex>;
diff --git a/PaletteDecoder.cc b/PaletteDecoder.cc
index 2d91a57..9dea55f 100644
--- a/PaletteDecoder.cc
+++ b/PaletteDecoder.cc
@@ -3,8 +3,8 @@
 #include "PaletteDecoder.hh"
 #include "exceptions.hh"
 
-PaletteDecoder::PaletteDecoder(uint8_t const* base, size_t length)
-  : iff_(base, length)
+PaletteDecoder::PaletteDecoder(Resource const& res)
+  : iff_(res)
 {
   auto& root = iff_.getRoot();
   if (!root.isForm())
@@ -20,6 +20,21 @@ PaletteDecoder::PaletteDecoder(uint8_t const* base, size_t length)
       std::transform(paltIt->begin()+4, paltIt->begin()+772,
 		     palette_.begin(),
 		     [](const char& in) -> uint8_t {return (in << 2) | ((in >> 6)&0x3);});
+      uint8_t min = 0xff, max = 0;
+      for (auto it = paltIt->begin()+4;it != paltIt->end();++it) {
+	if (*it == 0xff)
+	  continue;
+	min = std::min(min, *it);
+	max = std::max(max, *it);
+      }
+
+      printf("palt value range %hhu..%hhu\n", min, max);
+    } else if (paltIt->getType() == "BLWH") {
+      auto dstIt = palette_.begin();
+      for (auto it = paltIt->begin()+4;it != paltIt->end();++it) {
+	*dstIt = *dstIt * ((*it << 2) | ((*it >> 6)&0x3)) / 255u;
+	++dstIt;
+      }
     }
   }
 }
diff --git a/PaletteDecoder.hh b/PaletteDecoder.hh
index 88a0b71..f99cb1f 100644
--- a/PaletteDecoder.hh
+++ b/PaletteDecoder.hh
@@ -8,7 +8,7 @@
 
 class PaletteDecoder {
 public:
-  PaletteDecoder(uint8_t const* base, size_t length);
+  PaletteDecoder(Resource const& res);
 
   using Palette = std::array<uint8_t, 768>;
 
diff --git a/Resource.hh b/Resource.hh
new file mode 100644
index 0000000..f8ab693
--- /dev/null
+++ b/Resource.hh
@@ -0,0 +1,18 @@
+#ifndef WC3RE_RESOURCE_HH__
+#define WC3RE_RESOURCE_HH__
+
+// Interface for any memory-resident resource
+// For example mmap'd data file, TRE object, IFF Object, ...
+
+class Resource {
+public:
+  virtual ~Resource() {}
+
+  virtual uint8_t const* data() const = 0;
+  virtual size_t size() const = 0;
+
+  virtual operator bool() const = 0;
+};
+  
+
+#endif
diff --git a/TreFile.hh b/TreFile.hh
index ce886e2..400350e 100644
--- a/TreFile.hh
+++ b/TreFile.hh
@@ -8,6 +8,8 @@
 #include <tuple>
 #include <experimental/optional>
 
+#include "Resource.hh"
+
 class TreFile {
 public:
   TreFile(uint8_t const* base, size_t length);
@@ -27,7 +29,7 @@ public:
      'path' */
   static uint32_t calcCRC(std::string const& path);
   
-  class Object {
+  class Object : public Resource {
   public:
     Object() : base_(nullptr), length_(0) {
     }
@@ -50,19 +52,22 @@ public:
       move.length_ = 0;
       return *this;
     }
+
+    ~Object() override {
+    }
     
-    uint8_t const* data() const {
+    uint8_t const* data() const override {
       if (data_)
 	return data_->data();
       else
 	return base_;
     }
     
-    size_t size() const {
+    size_t size() const override {
       return length_;
     }
 
-    operator bool() const {
+    operator bool() const override {
       return data_ || base_;
     }
     
diff --git a/iffexplore.cc b/iffexplore.cc
index 24b6656..d8547b2 100644
--- a/iffexplore.cc
+++ b/iffexplore.cc
@@ -10,13 +10,13 @@
 #include "util.hh"
 #include "IffFile.hh"
 
-void blobDump(IffFile::Object const& obj, std::string const& filename)
+void blobDump(Resource const& obj, std::string const& filename)
 {
   FILEUPtr file{fopen(filename.c_str(), "wb")};
   if (!file)
     throw POSIXException{errno, "Could not open file: " + filename};
 
-  if (fwrite(obj.begin(), obj.getSize(), 1, file.get()) != 1)
+  if (fwrite(obj.data(), obj.size(), 1, file.get()) != 1)
     throw POSIXException{errno, "Could not write"};
 }
 
@@ -25,7 +25,7 @@ void iffDumper(IffFile::Object const& obj, bool dumpBlobs, std::string dumpPath,
 {
   for (unsigned i = 0;i < level;++i)
     putchar('\t');
-  printf("%s Length %lu (0x%.lx)", obj.getType().c_str(), obj.getSize(), obj.getSize());
+  printf("%s Length %lu (0x%.lx)", obj.getType().c_str(), obj.size(), obj.size());
   
   if (obj.isForm()) {
     auto& form = dynamic_cast<IffFile::Form const&>(obj);
@@ -88,7 +88,7 @@ int main(int argc, char *argv[])
   try {
     MmapFile mmap{iffFile};
    
-    IffFile iff{mmap.data(), mmap.size()};
+    IffFile iff{mmap};
       
     if (printStructure) {
       unsigned blobCount = 0, subdoc = 0;
diff --git a/mvedecode.cc b/mvedecode.cc
index 2db445e..1323f86 100644
--- a/mvedecode.cc
+++ b/mvedecode.cc
@@ -87,9 +87,9 @@ int main(int argc, char *argv[]) {
       if (!object) // Wasn't a CRC, try as name
 	object = tre->openName(objectSpec);
 	
-      mve = std::make_unique<MveDecoder>(object.data(), object.size());
+      mve = std::make_unique<MveDecoder>(object);
     } else
-      mve = std::make_unique<MveDecoder>(mmap.data(), mmap.size());
+      mve = std::make_unique<MveDecoder>(mmap);
 
     if (play) {
       Renderer renderer;
diff --git a/objdecode.cc b/objdecode.cc
index df8946d..61b3c01 100644
--- a/objdecode.cc
+++ b/objdecode.cc
@@ -17,21 +17,25 @@
 #include "game/GSShowObject.hh"
 
 void usage(char *argv0) {
-  fprintf(stderr, "Usage: %s [-h] (tre-file name/crc)/iff-file\n", argv0);
+  fprintf(stderr, "Usage: %s [-h] [-ppalt] (tre-file name/crc)/iff-file\n", argv0);
   fprintf(stderr, "\tAttempt to decode the object stored in iff-file, or in the\n\tiff-object \"name\"/\"crc\" contained in tre-file\n");
+  fprintf(stderr, "\t-p palt\tUse palette \"palt\"");
   fprintf(stderr, "\t-h\tPrint this help\n");
 }
 
 int main(int argc, char *argv[]) {
-  std::string inFile, objectSpec;
+  std::string inFile, objectSpec, paltFile = "tmp/1DC61F50";
   bool useTre = false;
   {
     int opt;
-    while ((opt = getopt(argc, argv, "h")) != -1) {
+    while ((opt = getopt(argc, argv, "hp:")) != -1) {
       switch (opt) {
       case 'h':
 	usage(argv[0]);
 	return 0;
+      case 'p':
+	paltFile = optarg;
+	break;
       default:
 	usage(argv[0]);
 	return 1;
@@ -52,8 +56,8 @@ int main(int argc, char *argv[]) {
   }
 
   try {
-    MmapFile paltMmap{"tmp/1DC61F50"};
-    PaletteDecoder palt{paltMmap.data(), paltMmap.size()};
+    MmapFile paltMmap{paltFile};
+    PaletteDecoder palt{paltMmap};
     
     MmapFile mmap{inFile};
     
@@ -77,9 +81,9 @@ int main(int argc, char *argv[]) {
       if (!object) // Wasn't a CRC, try as name
 	object = tre->openName(objectSpec);
 	
-      obj = std::make_unique<ObjDecoder>(object.data(), object.size());
+      obj = std::make_unique<ObjDecoder>(object);
     } else
-      obj = std::make_unique<ObjDecoder>(mmap.data(), mmap.size());
+      obj = std::make_unique<ObjDecoder>(mmap);
 
     render::Renderer renderer;
     renderer.pushGS(std::make_unique<game::GSShowObject>(renderer, *obj, palt));
diff --git a/treexplore.cc b/treexplore.cc
index feaa0ec..98eb399 100644
--- a/treexplore.cc
+++ b/treexplore.cc
@@ -74,7 +74,7 @@ int main(int argc, char *argv[]) {
 	  continue;
 	auto f = file.openName(name);
 	try {
-	  IffFile iff{f.data(), f.size()};
+	  IffFile iff{f};
 	  printf("%s:\n", name.c_str());
 	  iff.printStructure(1);
 	} catch(FormatException &ex) {
@@ -85,7 +85,7 @@ int main(int argc, char *argv[]) {
       for(auto crc : file.getCRCs()) {
 	auto f = file.openCRC(crc);
 	try {
-	  IffFile iff{f.data(), f.size()};
+	  IffFile iff{f};
 	  printf("%.8x:\n", crc);
 	  iff.printStructure(1);
 	} catch(FormatException &ex) {
diff --git a/util.hh b/util.hh
index 67d8232..d867b5a 100644
--- a/util.hh
+++ b/util.hh
@@ -5,23 +5,24 @@
 #include <string>
 
 #include "common.hh"
+#include "Resource.hh"
 
-class MmapFile {
+class MmapFile : public Resource {
 public:
   MmapFile(std::string fileName);
   MmapFile(MmapFile const& copy) = delete;
   MmapFile(MmapFile && move);
   
-  ~MmapFile();
+  ~MmapFile() override;
 
   MmapFile& operator=(MmapFile const& copy) = delete;
   MmapFile& operator=(MmapFile && move);
 
   std::string const& name() const;
-  size_t size() const;
-  uint8_t const* data() const;
+  size_t size() const override;
+  uint8_t const* data() const override;
 
-  operator bool() const;
+  operator bool() const override;
 private:
   std::string name_;
   FILEUPtr fd_;