The Quake sources as originally release under the GPL license on December 21, 1999

WinQuake/zone.h

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+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+/*
+ memory allocation
+
+
+H_??? The hunk manages the entire memory block given to quake.  It must be
+contiguous.  Memory can be allocated from either the low or high end in a
+stack fashion.  The only way memory is released is by resetting one of the
+pointers.
+
+Hunk allocations should be given a name, so the Hunk_Print () function
+can display usage.
+
+Hunk allocations are guaranteed to be 16 byte aligned.
+
+The video buffers are allocated high to avoid leaving a hole underneath
+server allocations when changing to a higher video mode.
+
+
+Z_??? Zone memory functions used for small, dynamic allocations like text
+strings from command input.  There is only about 48K for it, allocated at
+the very bottom of the hunk.
+
+Cache_??? Cache memory is for objects that can be dynamically loaded and
+can usefully stay persistant between levels.  The size of the cache
+fluctuates from level to level.
+
+To allocate a cachable object
+
+
+Temp_??? Temp memory is used for file loading and surface caching.  The size
+of the cache memory is adjusted so that there is a minimum of 512k remaining
+for temp memory.
+
+
+------ Top of Memory -------
+
+high hunk allocations
+
+<--- high hunk reset point held by vid
+
+video buffer
+
+z buffer
+
+surface cache
+
+<--- high hunk used
+
+cachable memory
+
+<--- low hunk used
+
+client and server low hunk allocations
+
+<-- low hunk reset point held by host
+
+startup hunk allocations
+
+Zone block
+
+----- Bottom of Memory -----
+
+
+
+*/
+
+void Memory_Init (void *buf, int size);
+
+void Z_Free (void *ptr);
+void *Z_Malloc (int size);			// returns 0 filled memory
+void *Z_TagMalloc (int size, int tag);
+
+void Z_DumpHeap (void);
+void Z_CheckHeap (void);
+int Z_FreeMemory (void);
+
+void *Hunk_Alloc (int size);		// returns 0 filled memory
+void *Hunk_AllocName (int size, char *name);
+
+void *Hunk_HighAllocName (int size, char *name);
+
+int	Hunk_LowMark (void);
+void Hunk_FreeToLowMark (int mark);
+
+int	Hunk_HighMark (void);
+void Hunk_FreeToHighMark (int mark);
+
+void *Hunk_TempAlloc (int size);
+
+void Hunk_Check (void);
+
+typedef struct cache_user_s
+{
+	void	*data;
+} cache_user_t;
+
+void Cache_Flush (void);
+
+void *Cache_Check (cache_user_t *c);
+// returns the cached data, and moves to the head of the LRU list
+// if present, otherwise returns NULL
+
+void Cache_Free (cache_user_t *c);
+
+void *Cache_Alloc (cache_user_t *c, int size, char *name);
+// Returns NULL if all purgable data was tossed and there still
+// wasn't enough room.
+
+void Cache_Report (void);
+
+
+