561 lines
9.9 KiB
C
561 lines
9.9 KiB
C
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// Handles WAD file header, directory, lump I/O.
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//
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//-----------------------------------------------------------------------------
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static const char
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rcsid[] = "$Id: w_wad.c,v 1.5 1997/02/03 16:47:57 b1 Exp $";
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#include "doomtype.h"
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#include "m_swap.h"
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#include "i_system.h"
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#include "z_zone.h"
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#ifdef __GNUG__
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#pragma implementation "w_wad.h"
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#endif
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#include "w_wad.h"
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//
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// GLOBALS
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//
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// Location of each lump on disk.
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lumpinfo_t* lumpinfo;
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int numlumps;
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void** lumpcache;
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#define strcmpi strcasecmp
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void strupr (char* s)
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{
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while (*s) { *s = toupper(*s); s++; }
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}
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int filelength (int handle)
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{
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return I_FileSize(handle);
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}
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void
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ExtractFileBase
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( char* path,
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char* dest )
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{
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char* src;
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int length;
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src = path + strlen(path) - 1;
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// back up until a \ or the start
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while (src != path
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&& *(src-1) != '\\'
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&& *(src-1) != '/')
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{
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src--;
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}
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// copy up to eight characters
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memset (dest,0,8);
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length = 0;
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while (*src && *src != '.')
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{
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if (++length == 9)
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I_Error ("Filename base of %s >8 chars",path);
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*dest++ = toupper((int)*src++);
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}
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}
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//
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// LUMP BASED ROUTINES.
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//
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//
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// W_AddFile
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// All files are optional, but at least one file must be
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// found (PWAD, if all required lumps are present).
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// Files with a .wad extension are wadlink files
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// with multiple lumps.
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// Other files are single lumps with the base filename
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// for the lump name.
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//
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// If filename starts with a tilde, the file is handled
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// specially to allow map reloads.
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// But: the reload feature is a fragile hack...
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int reloadlump;
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char* reloadname;
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void W_AddFile (char *filename)
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{
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wadinfo_t header;
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lumpinfo_t* lump_p;
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unsigned i;
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int handle;
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int length;
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int startlump;
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filelump_t* fileinfo;
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filelump_t singleinfo;
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int storehandle;
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// open the file and add to directory
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// handle reload indicator.
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if (filename[0] == '~')
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{
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filename++;
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reloadname = filename;
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reloadlump = numlumps;
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}
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if ( (handle = I_FileOpenRead(filename)) == -1)
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{
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I_printf (" couldn't open %s\n",filename);
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return;
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}
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I_printf (" adding %s\n",filename);
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startlump = numlumps;
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if (strcmp (filename+strlen(filename)-3 , "wad" ) && strcmp (filename+strlen(filename)-3 , "WAD" ) )
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{
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// single lump file
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fileinfo = &singleinfo;
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singleinfo.filepos = 0;
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singleinfo.size = LONG(filelength(handle));
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ExtractFileBase (filename, singleinfo.name);
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numlumps++;
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}
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else
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{
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// WAD file
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I_FileRead (handle, &header, sizeof(header));
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if (strncmp(header.identification,"IWAD",4))
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{
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// Homebrew levels?
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if (strncmp(header.identification,"PWAD",4))
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{
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I_Error ("Wad file %s doesn't have IWAD "
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"or PWAD id\n", filename);
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}
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// ???modifiedgame = true;
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}
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header.numlumps = LONG(header.numlumps);
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header.infotableofs = LONG(header.infotableofs);
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length = header.numlumps*sizeof(filelump_t);
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fileinfo = alloca (length);
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I_FilePos(handle, header.infotableofs);
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I_FileRead(handle, fileinfo, length);
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numlumps += header.numlumps;
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}
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// Fill in lumpinfo
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lumpinfo = I_Realloc (lumpinfo, numlumps*sizeof(lumpinfo_t));
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if (!lumpinfo)
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I_Error ("Couldn't realloc lumpinfo");
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lump_p = &lumpinfo[startlump];
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storehandle = reloadname ? -1 : handle;
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for (i=startlump ; i<numlumps ; i++,lump_p++, fileinfo++)
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{
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lump_p->handle = storehandle;
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lump_p->position = LONG(fileinfo->filepos);
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lump_p->size = LONG(fileinfo->size);
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strncpy (lump_p->name, fileinfo->name, 8);
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}
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if (reloadname)
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I_FileClose(handle);
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}
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//
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// W_Reload
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// Flushes any of the reloadable lumps in memory
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// and reloads the directory.
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//
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void W_Reload (void)
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{
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wadinfo_t header;
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int lumpcount;
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lumpinfo_t* lump_p;
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unsigned i;
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int handle;
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int length;
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filelump_t* fileinfo;
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if (!reloadname)
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return;
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if ( (handle = I_FileOpenRead(reloadname)) == -1)
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I_Error ("W_Reload: couldn't open %s",reloadname);
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I_FileRead(handle, &header, sizeof(header));
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lumpcount = LONG(header.numlumps);
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header.infotableofs = LONG(header.infotableofs);
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length = lumpcount*sizeof(filelump_t);
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fileinfo = alloca (length);
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I_FilePos(handle, header.infotableofs);
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I_FileRead(handle, fileinfo, length);
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// Fill in lumpinfo
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lump_p = &lumpinfo[reloadlump];
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for (i=reloadlump ;
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i<reloadlump+lumpcount ;
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i++,lump_p++, fileinfo++)
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{
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if (lumpcache[i])
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Z_Free (lumpcache[i]);
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lump_p->position = LONG(fileinfo->filepos);
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lump_p->size = LONG(fileinfo->size);
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}
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I_FileClose(handle);
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}
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//
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// W_InitMultipleFiles
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// Pass a null terminated list of files to use.
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// All files are optional, but at least one file
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// must be found.
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// Files with a .wad extension are idlink files
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// with multiple lumps.
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// Other files are single lumps with the base filename
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// for the lump name.
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// Lump names can appear multiple times.
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// The name searcher looks backwards, so a later file
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// does override all earlier ones.
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//
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void W_InitMultipleFiles (char** filenames)
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{
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int size;
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// open all the files, load headers, and count lumps
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numlumps = 0;
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// will be realloced as lumps are added
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lumpinfo = I_Malloc(1);
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for ( ; *filenames ; filenames++)
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W_AddFile (*filenames);
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if (!numlumps)
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I_Error ("W_InitFiles: no files found");
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// set up caching
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size = numlumps * sizeof(*lumpcache);
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lumpcache = I_Malloc (size);
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if (!lumpcache)
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I_Error ("Couldn't allocate lumpcache");
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memset (lumpcache,0, size);
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}
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//
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// W_InitFile
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// Just initialize from a single file.
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//
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void W_InitFile (char* filename)
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{
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char* names[2];
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names[0] = filename;
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names[1] = NULL;
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W_InitMultipleFiles (names);
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}
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//
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// W_NumLumps
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//
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int W_NumLumps (void)
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{
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return numlumps;
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}
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//
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// W_CheckNumForName
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// Returns -1 if name not found.
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//
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int W_CheckNumForName (char* name)
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{
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union {
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char s[9];
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int x[2];
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} name8;
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int v1;
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int v2;
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lumpinfo_t* lump_p;
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// make the name into two integers for easy compares
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strncpy (name8.s,name,8);
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// in case the name was a fill 8 chars
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name8.s[8] = 0;
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// case insensitive
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strupr (name8.s);
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v1 = name8.x[0];
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v2 = name8.x[1];
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// scan backwards so patch lump files take precedence
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lump_p = lumpinfo + numlumps;
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while (lump_p-- != lumpinfo)
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{
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if ( *(int *)lump_p->name == v1
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&& *(int *)&lump_p->name[4] == v2)
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{
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return lump_p - lumpinfo;
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}
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}
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// TFB. Not found.
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return -1;
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}
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//
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// W_GetNumForName
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// Calls W_CheckNumForName, but bombs out if not found.
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//
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int W_GetNumForName (char* name)
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{
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int i;
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i = W_CheckNumForName (name);
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if (i == -1)
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I_Error ("W_GetNumForName: %s not found!", name);
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return i;
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}
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//
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// W_LumpLength
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// Returns the buffer size needed to load the given lump.
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//
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int W_LumpLength (int lump)
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{
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if (lump >= numlumps)
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I_Error ("W_LumpLength: %i >= numlumps",lump);
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return lumpinfo[lump].size;
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}
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//
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// W_ReadLump
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// Loads the lump into the given buffer,
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// which must be >= W_LumpLength().
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//
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void
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W_ReadLump
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( int lump,
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void* dest )
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{
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int c;
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lumpinfo_t* l;
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int handle;
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if (lump >= numlumps)
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I_Error ("W_ReadLump: %i >= numlumps",lump);
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l = lumpinfo+lump;
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// ??? I_BeginRead ();
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if (l->handle == -1)
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{
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// reloadable file, so use open / read / close
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if ( (handle = I_FileOpenRead(reloadname)) == -1)
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I_Error ("W_ReadLump: couldn't open %s",reloadname);
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}
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else
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handle = l->handle;
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I_FilePos(handle, l->position);
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c = I_FileRead(handle, dest, l->size);
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if (c < l->size)
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I_Error ("W_ReadLump: only read %i of %i on lump %i",
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c,l->size,lump);
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if (l->handle == -1)
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I_FileClose (handle);
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// ??? I_EndRead ();
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}
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//
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// W_CacheLumpNum
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//
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void*
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W_CacheLumpNum
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( int lump,
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int tag )
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{
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byte* ptr;
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if ((unsigned)lump >= numlumps)
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I_Error ("W_CacheLumpNum: %i >= numlumps",lump);
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if (!lumpcache[lump])
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{
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// read the lump in
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//I_printf ("cache miss on lump %i\n",lump);
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ptr = Z_Malloc (W_LumpLength (lump), tag, &lumpcache[lump]);
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W_ReadLump (lump, lumpcache[lump]);
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}
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else
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{
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//I_printf ("cache hit on lump %i\n",lump);
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Z_ChangeTag (lumpcache[lump],tag);
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}
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return lumpcache[lump];
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}
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//
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// W_CacheLumpName
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//
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void*
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W_CacheLumpName
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( char* name,
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int tag )
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{
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return W_CacheLumpNum (W_GetNumForName(name), tag);
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}
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//
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// W_Profile
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//
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int info[2500][10];
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int profilecount;
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void W_Profile (void)
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{
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int i;
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memblock_t* block;
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void* ptr;
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char ch;
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FILE* f;
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int j;
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char name[9];
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for (i=0 ; i<numlumps ; i++)
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{
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ptr = lumpcache[i];
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if (!ptr)
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{
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ch = ' ';
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continue;
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}
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else
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{
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block = (memblock_t *) ( (byte *)ptr - sizeof(memblock_t));
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if (block->tag < PU_PURGELEVEL)
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ch = 'S';
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else
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ch = 'P';
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}
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info[i][profilecount] = ch;
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}
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profilecount++;
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#if 0 // AJH uGFX HACK
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f = fopen ("waddump.txt","w");
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name[8] = 0;
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for (i=0 ; i<numlumps ; i++)
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{
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memcpy (name,lumpinfo[i].name,8);
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for (j=0 ; j<8 ; j++)
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if (!name[j])
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break;
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for ( ; j<8 ; j++)
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name[j] = ' ';
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fprintf (f,"%s ",name);
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for (j=0 ; j<profilecount ; j++)
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fprintf (f," %c",info[i][j]);
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fprintf (f,"\n");
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}
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fclose (f);
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#endif
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}
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