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utils/tfstats/regexp/include/jm/re_raw.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+/*
+ *
+ * Copyright (c) 1998-9
+ * Dr John Maddock
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Dr John Maddock makes no representations
+ * about the suitability of this software for any purpose.
+ * It is provided "as is" without express or implied warranty.
+ *
+ */
+
+ /*
+  *   FILE     re_raw.h
+  *   VERSION  2.12
+  */
+  
+#ifndef RE_RAW_H
+#define RE_RAW_H
+
+#ifndef JM_CFG_H
+#include <jm/jm_cfg.h>
+#endif
+
+JM_NAMESPACE(__JM)
+
+union padding
+{
+   void* p;
+   unsigned int i;
+};
+
+
+//
+// class raw_storage
+// basically this is a simplified vector<unsigned char>
+// this is used by reg_expression for expression storage
+//
+
+template <class Allocator>
+class raw_storage
+{
+public:
+   typedef Allocator alloc_type;
+   typedef typename REBIND_TYPE(unsigned char, alloc_type)::size_type size_type;
+   typedef JM_MAYBE_TYPENAME REBIND_TYPE(unsigned char, alloc_type) alloc_inst_type;
+   typedef typename REBIND_TYPE(unsigned char, alloc_type)::pointer pointer;
+private:
+   //
+   // empty member optimisation:
+   struct alloc_data : public alloc_inst_type
+   {
+      pointer last;
+      alloc_data(const Allocator& a) : alloc_inst_type(a){}
+   } alloc_inst;
+   pointer start, end;
+public:
+
+   raw_storage(const Allocator& a = Allocator());
+   raw_storage(size_type n, const Allocator& a = Allocator());
+
+   ~raw_storage()
+   {
+      alloc_inst.deallocate(start, (alloc_inst.last - start));
+   }
+
+   void RE_CALL resize(size_type n);
+   
+   void* RE_CALL extend(size_type n)
+   {
+      if(size_type(alloc_inst.last - end) < n)
+         resize(n + (end - start));
+      register void* result = end;
+      end += n;
+      return result;
+   }
+
+   void* RE_CALL insert(size_type pos, size_type n);
+
+   size_type RE_CALL size()
+   {
+      return end - start;
+   }
+
+   size_type RE_CALL capacity()
+   {
+      return alloc_inst.last - start;
+   }
+
+   void* RE_CALL data()const
+   {
+      return start;
+   }
+
+   size_type RE_CALL index(void* ptr)
+   {
+      return (unsigned char*)ptr - start;
+   }
+
+   void RE_CALL clear()
+   {
+      end = start;
+   }
+
+   void RE_CALL align()
+   {
+      // move end up to a boundary:
+      end = (unsigned char*)((long)(end + sizeof(padding) - 1) & ~((long)sizeof(padding) - 1));
+   }
+
+   Allocator RE_CALL allocator()const;
+};
+
+template <class Allocator>
+CONSTRUCTOR_INLINE raw_storage<Allocator>::raw_storage(const Allocator& a)
+  : alloc_inst(a)
+{
+  start = end = alloc_inst.allocate(1024);
+  alloc_inst.last = start + 1024;
+}
+
+template <class Allocator>
+CONSTRUCTOR_INLINE raw_storage<Allocator>::raw_storage(size_type n, const Allocator& a)
+  : alloc_inst(a)
+{
+  start = end = alloc_inst.allocate(n);
+  alloc_inst.last = start + n;
+}
+
+template <class Allocator>
+Allocator RE_CALL raw_storage<Allocator>::allocator()const
+{
+  return alloc_inst;
+}
+
+template <class Allocator>
+void RE_CALL raw_storage<Allocator>::resize(size_type n)
+{
+   register size_type newsize = (alloc_inst.last - start) * 2;
+   register size_type datasize = end - start;
+   if(newsize < n)
+      newsize = n;
+   // extend newsize to WORD/DWORD boundary:
+   newsize = (newsize + (sizeof(padding) - 1)) & ~(sizeof(padding) - 1);
+
+   // allocate and copy data:
+   register unsigned char* ptr = alloc_inst.allocate(newsize);
+   memcpy(ptr, start, datasize);
+
+   // get rid of old buffer:
+   alloc_inst.deallocate(start, (alloc_inst.last - start));
+
+   // and set up pointers:
+   start = ptr;
+   end = ptr + datasize;
+   alloc_inst.last = ptr + newsize;
+}
+
+template <class Allocator>
+void* RE_CALL raw_storage<Allocator>::insert(size_type pos, size_type n)
+{
+   jm_assert(pos <= size_type(end - start));
+   if(size_type(alloc_inst.last - end) < n)
+      resize(n + (end - start));
+   register void* result = start + pos;
+   memmove(start + pos + n, start + pos, (end - start) - pos);
+   end += n;
+   return result;
+}
+
+JM_END_NAMESPACE
+
+#endif
+
+