Minor performance gains on loading cell references.

- Use integers where possible
- Unfortunately many functions are simply duplicated for now, but over time the deprecated ones will be removed

components/esm/cellref.cpp

@@ -6,9 +6,9 @@
 void ESM::RefNum::load (ESMReader& esm, bool wide)
 {
     if (wide)
-        esm.getHNT (*this, "FRMR", 8);
+        esm.getHNT (*this, SREC_FRMR, 8);
     else
-        esm.getHNT (mIndex, "FRMR");
+        esm.getHNT (mIndex, SREC_FRMR);
 }
 
 void ESM::RefNum::save (ESMWriter &esm, bool wide, const std::string& tag) const
@@ -36,14 +36,14 @@ void ESM::CellRef::loadId (ESMReader& esm, bool wideRefNum)
     // the following refs are part of a "temp refs" section. A temp ref is not being tracked by the moved references system.
     // Its only purpose is a performance optimization for "immovable" things. We don't need this, and it's problematic anyway,
     // because any item can theoretically be moved by a script.
-    if (esm.isNextSub ("NAM0"))
+    if (esm.isNextSub (SREC_NAM0))
         esm.skipHSub();
 
     blank();
 
     mRefNum.load (esm, wideRefNum);
 
-    mRefID = esm.getHNString ("NAME");
+    esm.getHNString (SREC_NAME, mRefID);
 }
 
 void ESM::CellRef::loadData(ESMReader &esm, bool &isDeleted)

components/esm/defs.hpp

@@ -128,7 +128,9 @@ enum RecNameInts
 enum SubRecNameInts
 {
     SREC_DELE = ESM::FourCC<'D','E','L','E'>::value,
-    SREC_NAME = ESM::FourCC<'N','A','M','E'>::value
+    SREC_NAME = ESM::FourCC<'N','A','M','E'>::value,
+    SREC_NAM0 = ESM::FourCC<'N','A','M','0'>::value,
+    SREC_FRMR = ESM::FourCC<'F','R','M','R'>::value
 };
 
 }

components/esm/esmreader.cpp

@@ -109,6 +109,12 @@ std::string ESMReader::getHNString(const char* name)
     return getHString();
 }
 
+void ESMReader::getHNString(const int name, std::string& str)
+{
+    getSubNameIs(name);
+    getHString(str);
+}
+
 std::string ESMReader::getHString()
 {
     getSubHeader();
@@ -130,6 +136,28 @@ std::string ESMReader::getHString()
     return getString(mCtx.leftSub);
 }
 
+void ESMReader::getHString(std::string& str)
+{
+    getSubHeader();
+
+    // Hack to make MultiMark.esp load. Zero-length strings do not
+    // occur in any of the official mods, but MultiMark makes use of
+    // them. For some reason, they break the rules, and contain a byte
+    // (value 0) even if the header says there is no data. If
+    // Morrowind accepts it, so should we.
+    if (mCtx.leftSub == 0)
+    {
+        // Skip the following zero byte
+        mCtx.leftRec--;
+        char c;
+        getExact(&c, 1);
+        str = "";
+        return;
+    }
+
+    getString(str, mCtx.leftSub);
+}
+
 void ESMReader::getHExact(void*p, int size)
 {
     getSubHeader();
@@ -159,6 +187,24 @@ void ESMReader::getSubNameIs(const char* name)
                         + mCtx.subName.toString());
 }
 
+void ESMReader::getSubNameIs(const int name)
+{
+    getSubName();
+    if (mCtx.subName != name)
+    {
+        unsigned char typeName[4];
+        typeName[0] =  name        & 0xff;
+        typeName[1] = (name >>  8) & 0xff;
+        typeName[2] = (name >> 16) & 0xff;
+        typeName[3] = (name >> 24) & 0xff;
+
+        std::string subName = std::string((char*)typeName, 4);
+
+        fail("Expected subrecord " + subName + " but got "
+                        + mCtx.subName.toString());
+    }
+}
+
 bool ESMReader::isNextSub(const char* name)
 {
     if (!mCtx.leftRec)
@@ -174,6 +220,21 @@ bool ESMReader::isNextSub(const char* name)
     return !mCtx.subCached;
 }
 
+bool ESMReader::isNextSub(const int name)
+{
+    if (!mCtx.leftRec)
+        return false;
+
+    getSubName();
+
+    // If the name didn't match, then mark the it as 'cached' so it's
+    // available for the next call to getSubName.
+    mCtx.subCached = (mCtx.subName != name);
+
+    // If subCached is false, then subName == name.
+    return !mCtx.subCached;
+}
+
 bool ESMReader::peekNextSub(const char *name)
 {
     if (!mCtx.leftRec)
@@ -347,6 +408,26 @@ std::string ESMReader::getString(int size)
     return std::string (ptr, size);
 }
 
+void ESMReader::getString(std::string& str, int size)
+{
+    size_t s = size;
+    if (mBuffer.size() <= s)
+        // Add some extra padding to reduce the chance of having to resize again later.
+        mBuffer.resize(3*s);
+
+    mBuffer[s] = 0; // And make sure the string is zero terminated
+
+    char *ptr = &mBuffer[0];
+    getExact(ptr, size); // read ESM data
+
+    size = static_cast<int>(strnlen(ptr, size));
+
+    if (mEncoder)
+        str = mEncoder->getUtf8(ptr, size); // Convert to UTF8 and return
+    else
+        str = std::string (ptr, size);
+}
+
 void ESMReader::fail(const std::string &msg)
 {
     using namespace std;

components/esm/esmreader.hpp

@@ -103,6 +103,13 @@ public:
     getHT(x);
   }
 
+  template <typename X>
+  void getHNT(X &x, const int name)
+  {
+    getSubNameIs(name);
+    getHT(x);
+  }
+
   // Optional version of getHNT
   template <typename X>
   void getHNOT(X &x, const char* name)
@@ -121,6 +128,14 @@ public:
       getHT(x);
   }
 
+  template <typename X>
+  void getHNT(X &x, const int name, int size)
+  {
+      assert(sizeof(X) == size);
+      getSubNameIs(name);
+      getHT(x);
+  }
+
   template <typename X>
   void getHNOT(X &x, const char* name, int size)
   {
@@ -159,9 +174,11 @@ public:
 
   // Read a string with the given sub-record name
   std::string getHNString(const char* name);
+  void getHNString(const int name, std::string& str);
 
   // Read a string, including the sub-record header (but not the name)
   std::string getHString();
+  void getHString(std::string& str);
 
   // Read the given number of bytes from a subrecord
   void getHExact(void*p, int size);
@@ -177,6 +194,7 @@ public:
 
   // Get the next subrecord name and check if it matches the parameter
   void getSubNameIs(const char* name);
+  void getSubNameIs(const int name);
 
   /** Checks if the next sub record name matches the parameter. If it
       does, it is read into 'subName' just as if getSubName() was
@@ -184,6 +202,7 @@ public:
       calls to getSubName(), isNextSub() and getSubNameIs().
    */
   bool isNextSub(const char* name);
+  bool isNextSub(const int name);
 
   bool peekNextSub(const char* name);
 
@@ -256,6 +275,7 @@ public:
   // Read the next 'size' bytes and return them as a string. Converts
   // them from native encoding to UTF8 in the process.
   std::string getString(int size);
+  void getString(std::string& str, int size);
 
   void skip(int bytes) { mEsm->seek(mEsm->tell()+bytes); }
   uint64_t getOffset() { return mEsm->tell(); }