common.c, common.h: Added LOADFILE_* defines for use with COM_LoadFile,

for easier reading. Added COM_LoadZoneFile(), COM_LoadMallocFile() and
COM_LoadBufFile() from uhexen2. Added comments after their prototypes
in common.h.


git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@361 af15c1b1-3010-417e-b628-4374ebc0bcbd

Quake/common.c

@@ -1634,9 +1634,18 @@ Filename are reletive to the quake directory.
 Allways appends a 0 byte.
 ============
 */
-cache_user_t *loadcache;
-byte    *loadbuf;
-int             loadsize;
+#define	LOADFILE_ZONE		0
+#define	LOADFILE_HUNK		1
+#define	LOADFILE_TEMPHUNK	2
+#define	LOADFILE_CACHE		3
+#define	LOADFILE_STACK		4
+#define	LOADFILE_BUF		5
+#define	LOADFILE_MALLOC		6
+
+static byte	*loadbuf;
+static cache_user_t *loadcache;
+static int	loadsize;
+
 byte *COM_LoadFile (const char *path, int usehunk)
 {
 	int             h;
@@ -1654,23 +1663,38 @@ byte *COM_LoadFile (const char *path, int usehunk)
 // extract the filename base name for hunk tag
 	COM_FileBase (path, base);
 
-	if (usehunk == 1)
-		buf = (byte *) Hunk_AllocName (len+1, base);
-	else if (usehunk == 2)
-		buf = (byte *) Hunk_TempAlloc (len+1);
-	else if (usehunk == 0)
-		buf = (byte *) Z_Malloc (len+1);
-	else if (usehunk == 3)
-		buf = (byte *) Cache_Alloc (loadcache, len+1, base);
-	else if (usehunk == 4)
+	switch (usehunk)
 	{
-		if (len+1 > loadsize)
+	case LOADFILE_HUNK:
+		buf = (byte *) Hunk_AllocName (len+1, base);
+		break;
+	case LOADFILE_TEMPHUNK:
 		buf = (byte *) Hunk_TempAlloc (len+1);
-		else
+		break;
+	case LOADFILE_ZONE:
+		buf = (byte *) Z_Malloc (len+1);
+		break;
+	case LOADFILE_CACHE:
+		buf = (byte *) Cache_Alloc (loadcache, len+1, base);
+		break;
+	case LOADFILE_STACK:
+		if (len < loadsize)
 			buf = loadbuf;
-	}
 		else
+			buf = (byte *) Hunk_TempAlloc (len+1);
+		break;
+	case LOADFILE_BUF:
+		if (len < loadsize && loadbuf != NULL)
+			buf = loadbuf;
+		else
+			buf = (byte *) Hunk_AllocName(len + 1, base);
+		break;
+	case LOADFILE_MALLOC:
+		buf = (byte *) malloc (len+1);
+		break;
+	default:
 		Sys_Error ("COM_LoadFile: bad usehunk");
+	}
 
 	if (!buf)
 		Sys_Error ("COM_LoadFile: not enough space for %s", path);
@@ -1685,18 +1709,23 @@ byte *COM_LoadFile (const char *path, int usehunk)
 
 byte *COM_LoadHunkFile (const char *path)
 {
-	return COM_LoadFile (path, 1);
+	return COM_LoadFile (path, LOADFILE_HUNK);
+}
+
+byte *COM_LoadZoneFile (const char *path)
+{
+	return COM_LoadFile (path, LOADFILE_ZONE);
 }
 
 byte *COM_LoadTempFile (const char *path)
 {
-	return COM_LoadFile (path, 2);
+	return COM_LoadFile (path, LOADFILE_TEMPHUNK);
 }
 
 void COM_LoadCacheFile (const char *path, struct cache_user_s *cu)
 {
 	loadcache = cu;
-	COM_LoadFile (path, 3);
+	COM_LoadFile (path, LOADFILE_CACHE);
 }
 
 // uses temp hunk if larger than bufsize
@@ -1706,11 +1735,35 @@ byte *COM_LoadStackFile (const char *path, void *buffer, int bufsize)
 
 	loadbuf = (byte *)buffer;
 	loadsize = bufsize;
-	buf = COM_LoadFile (path, 4);
+	buf = COM_LoadFile (path, LOADFILE_STACK);
 
 	return buf;
 }
 
+// loads into a previously allocated buffer. if space is insufficient
+// or the buffer is NULL, loads onto the hunk.  bufsize is the actual
+// size (without the +1).
+byte *COM_LoadBufFile (const char *path, void *buffer, int *bufsize)
+{
+	byte	*buf;
+
+	loadbuf = (byte *)buffer;
+	loadsize = (*bufsize) + 1;
+	buf = COM_LoadFile (path, LOADFILE_BUF);
+	*bufsize = (buf == NULL) ? 0 : com_filesize;
+	if (loadbuf && buf && buf != loadbuf)
+		Sys_Printf("LoadBufFile: insufficient buffer for %s not used.\n", path);
+
+	return buf;
+}
+
+// returns malloc'd memory
+byte *COM_LoadMallocFile (const char *path)
+{
+	return COM_LoadFile (path, LOADFILE_MALLOC);
+}
+
+
 /*
 =================
 COM_LoadPackFile -- johnfitz -- modified based on topaz's tutorial

Quake/common.h

@@ -190,10 +190,28 @@ int COM_OpenFile (const char *filename, int *hndl);
 int COM_FOpenFile (const char *filename, FILE **file);
 void COM_CloseFile (int h);
 
+// these procedures open a file using COM_FindFile and loads it into a proper
+// buffer. the buffer is allocated with a total size of com_filesize + 1. the
+// procedures differ by their buffer allocation method.
 byte *COM_LoadStackFile (const char *path, void *buffer, int bufsize);
+	// uses the specified stack stack buffer with the specified size
+	// of bufsize. if bufsize is too short, uses temp hunk. the bufsize
+	// must include the +1
 byte *COM_LoadTempFile (const char *path);
+	// allocates the buffer on the temp hunk.
 byte *COM_LoadHunkFile (const char *path);
+	// allocates the buffer on the hunk.
+byte *COM_LoadZoneFile (const char *path);
+	// allocates the buffer on the zone.
 void COM_LoadCacheFile (const char *path, struct cache_user_s *cu);
+	// uses cache mem for allocating the buffer.
+byte *COM_LoadMallocFile (const char *path);
+	// allocates the buffer on the system mem (malloc).
+byte *COM_LoadBufFile (const char *path, void *buffer, int *bufsize);
+	// uses the specified pre-allocated buffer with bufsize + 1 size.
+	// bufsize is the actual expected size (without the + 1).  if the
+	// space is too short or the buffer is NULL, loads onto the hunk.
+	// sets bufsize to com_filesize for success, or to 0 for failure.
 
 /* The following FS_*() stdio replacements are necessary if one is
  * to perform non-sequential reads on files reopened on pak files