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476 lines
14 KiB
C
476 lines
14 KiB
C
/* Emacs style mode select -*- C++ -*-
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*-----------------------------------------------------------------------------
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*
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*
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* PrBoom: a Doom port merged with LxDoom and LSDLDoom
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* based on BOOM, a modified and improved DOOM engine
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* Copyright (C) 1999 by
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* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
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* Copyright (C) 1999-2001 by
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* Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
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* Copyright 2005, 2006 by
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* Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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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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*/
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// use config.h if autoconf made one -- josh
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef _MSC_VER
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#include <stddef.h>
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#include <io.h>
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#endif
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#include <fcntl.h>
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#include "doomstat.h"
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#include "d_net.h"
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#include "doomtype.h"
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#include "i_system.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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#include "lprintf.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; // killough
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void ExtractFileBase (const char *path, char *dest)
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{
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const char *src = path + strlen(path) - 1;
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int length;
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// back up until a \ or the start
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while (src != path && src[-1] != ':' // killough 3/22/98: allow c:filename
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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 != '.') && (++length<9))
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{
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*dest++ = toupper(*src);
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*src++;
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}
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/* cph - length check removed, just truncate at 8 chars.
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* If there are 8 or more chars, we'll copy 8, and no zero termination
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*/
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}
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//
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// 1/18/98 killough: adds a default extension to a path
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// Note: Backslashes are treated specially, for MS-DOS.
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//
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char *AddDefaultExtension(char *path, const char *ext)
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{
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char *p = path;
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while (*p++);
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while (p-->path && *p!='/' && *p!='\\')
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if (*p=='.')
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return path;
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if (*ext!='.')
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strcat(path,".");
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return strcat(path,ext);
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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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// Reload hack removed by Lee Killough
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// CPhipps - source is an enum
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//
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// proff - changed using pointer to wadfile_info_t
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static void W_AddFile(wadfile_info_t *wadfile)
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// killough 1/31/98: static, const
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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 length;
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int startlump;
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filelump_t *fileinfo, *fileinfo2free=NULL; //killough
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filelump_t singleinfo;
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// open the file and add to directory
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wadfile->handle = open(wadfile->name,O_RDONLY | O_BINARY);
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#ifdef HAVE_NET
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if (wadfile->handle == -1 && D_NetGetWad(wadfile->name)) // CPhipps
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wadfile->handle = open(wadfile->name,O_RDONLY | O_BINARY);
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#endif
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if (wadfile->handle == -1)
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{
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if ( strlen(wadfile->name)<=4 || // add error check -- killough
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(strcasecmp(wadfile->name+strlen(wadfile->name)-4 , ".lmp" ) &&
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strcasecmp(wadfile->name+strlen(wadfile->name)-4 , ".gwa" ) )
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)
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I_Error("W_AddFile: couldn't open %s",wadfile->name);
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return;
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}
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//jff 8/3/98 use logical output routine
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lprintf (LO_INFO," adding %s\n",wadfile->name);
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startlump = numlumps;
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if ( strlen(wadfile->name)<=4 ||
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(
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strcasecmp(wadfile->name+strlen(wadfile->name)-4,".wad") &&
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strcasecmp(wadfile->name+strlen(wadfile->name)-4,".gwa")
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)
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)
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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(I_Filelength(wadfile->handle));
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ExtractFileBase(wadfile->name, 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_Read(wadfile->handle, &header, sizeof(header));
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if (strncmp(header.identification,"IWAD",4) &&
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strncmp(header.identification,"PWAD",4))
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I_Error("W_AddFile: Wad file %s doesn't have IWAD or PWAD id", wadfile->name);
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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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fileinfo2free = fileinfo = malloc(length); // killough
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lseek(wadfile->handle, header.infotableofs, SEEK_SET);
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I_Read(wadfile->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 = realloc(lumpinfo, numlumps*sizeof(lumpinfo_t));
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lump_p = &lumpinfo[startlump];
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for (i=startlump ; (int)i<numlumps ; i++,lump_p++, fileinfo++)
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{
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lump_p->wadfile = wadfile; // killough 4/25/98
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lump_p->position = LONG(fileinfo->filepos);
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lump_p->size = LONG(fileinfo->size);
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lump_p->li_namespace = ns_global; // killough 4/17/98
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strncpy (lump_p->name, fileinfo->name, 8);
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lump_p->source = wadfile->src; // Ty 08/29/98
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}
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free(fileinfo2free); // killough
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}
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// jff 1/23/98 Create routines to reorder the master directory
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// putting all flats into one marked block, and all sprites into another.
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// This will allow loading of sprites and flats from a PWAD with no
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// other changes to code, particularly fast hashes of the lumps.
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//
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// killough 1/24/98 modified routines to be a little faster and smaller
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static int IsMarker(const char *marker, const char *name)
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{
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return !strncasecmp(name, marker, 8) ||
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(*name == *marker && !strncasecmp(name+1, marker, 7));
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}
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// killough 4/17/98: add namespace tags
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static void W_CoalesceMarkedResource(const char *start_marker,
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const char *end_marker, int li_namespace)
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{
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lumpinfo_t *marked = malloc(sizeof(*marked) * numlumps);
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size_t i, num_marked = 0, num_unmarked = 0;
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int is_marked = 0, mark_end = 0;
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lumpinfo_t *lump = lumpinfo;
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for (i=numlumps; i--; lump++)
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if (IsMarker(start_marker, lump->name)) // start marker found
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{ // If this is the first start marker, add start marker to marked lumps
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if (!num_marked)
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{
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strncpy(marked->name, start_marker, 8);
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marked->size = 0; // killough 3/20/98: force size to be 0
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marked->li_namespace = ns_global; // killough 4/17/98
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marked->wadfile = NULL;
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num_marked = 1;
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}
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is_marked = 1; // start marking lumps
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}
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else
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if (IsMarker(end_marker, lump->name)) // end marker found
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{
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mark_end = 1; // add end marker below
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is_marked = 0; // stop marking lumps
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}
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else
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if (is_marked) // if we are marking lumps,
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{ // move lump to marked list
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marked[num_marked] = *lump;
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marked[num_marked++].li_namespace = li_namespace; // killough 4/17/98
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}
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else
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lumpinfo[num_unmarked++] = *lump; // else move down THIS list
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// Append marked list to end of unmarked list
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memcpy(lumpinfo + num_unmarked, marked, num_marked * sizeof(*marked));
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free(marked); // free marked list
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numlumps = num_unmarked + num_marked; // new total number of lumps
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if (mark_end) // add end marker
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{
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lumpinfo[numlumps].size = 0; // killough 3/20/98: force size to be 0
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lumpinfo[numlumps].wadfile = NULL;
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lumpinfo[numlumps].li_namespace = ns_global; // killough 4/17/98
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strncpy(lumpinfo[numlumps++].name, end_marker, 8);
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}
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}
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// Hash function used for lump names.
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// Must be mod'ed with table size.
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// Can be used for any 8-character names.
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// by Lee Killough
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unsigned W_LumpNameHash(const char *s)
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{
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unsigned hash;
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(void) ((hash = toupper(s[0]), s[1]) &&
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(hash = hash*3+toupper(s[1]), s[2]) &&
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(hash = hash*2+toupper(s[2]), s[3]) &&
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(hash = hash*2+toupper(s[3]), s[4]) &&
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(hash = hash*2+toupper(s[4]), s[5]) &&
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(hash = hash*2+toupper(s[5]), s[6]) &&
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(hash = hash*2+toupper(s[6]),
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hash = hash*2+toupper(s[7]))
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);
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return hash;
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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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// Rewritten by Lee Killough to use hash table for performance. Significantly
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// cuts down on time -- increases Doom performance over 300%. This is the
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// single most important optimization of the original Doom sources, because
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// lump name lookup is used so often, and the original Doom used a sequential
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// search. For large wads with > 1000 lumps this meant an average of over
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// 500 were probed during every search. Now the average is under 2 probes per
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// search. There is no significant benefit to packing the names into longwords
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// with this new hashing algorithm, because the work to do the packing is
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// just as much work as simply doing the string comparisons with the new
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// algorithm, which minimizes the expected number of comparisons to under 2.
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//
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// killough 4/17/98: add namespace parameter to prevent collisions
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// between different resources such as flats, sprites, colormaps
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//
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int (W_CheckNumForName)(register const char *name, register int li_namespace)
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{
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// Hash function maps the name to one of possibly numlump chains.
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// It has been tuned so that the average chain length never exceeds 2.
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// proff 2001/09/07 - check numlumps==0, this happens when called before WAD loaded
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register int i = (numlumps==0)?(-1):(lumpinfo[W_LumpNameHash(name) % (unsigned) numlumps].index);
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// We search along the chain until end, looking for case-insensitive
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// matches which also match a namespace tag. Separate hash tables are
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// not used for each namespace, because the performance benefit is not
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// worth the overhead, considering namespace collisions are rare in
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// Doom wads.
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while (i >= 0 && (strncasecmp(lumpinfo[i].name, name, 8) ||
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lumpinfo[i].li_namespace != li_namespace))
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i = lumpinfo[i].next;
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// Return the matching lump, or -1 if none found.
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return i;
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}
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//
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// killough 1/31/98: Initialize lump hash table
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//
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void W_HashLumps(void)
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{
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int i;
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for (i=0; i<numlumps; i++)
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lumpinfo[i].index = -1; // mark slots empty
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// Insert nodes to the beginning of each chain, in first-to-last
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// lump order, so that the last lump of a given name appears first
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// in any chain, observing pwad ordering rules. killough
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for (i=0; i<numlumps; i++)
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{ // hash function:
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int j = W_LumpNameHash(lumpinfo[i].name) % (unsigned) numlumps;
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lumpinfo[i].next = lumpinfo[j].index; // Prepend to list
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lumpinfo[j].index = i;
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}
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}
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// End of lump hashing -- killough 1/31/98
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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 (const char* name) // killough -- const added
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{
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int i = W_CheckNumForName (name);
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if (i == -1)
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I_Error("W_GetNumForName: %.8s not found", name);
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return i;
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}
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// W_Init
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// Loads each of the files in the wadfiles array.
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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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// CPhipps - modified to use the new wadfiles array
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//
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wadfile_info_t *wadfiles=NULL;
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size_t numwadfiles = 0; // CPhipps - size of the wadfiles array (dynamic, no limit)
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void W_Init(void)
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{
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// CPhipps - start with nothing
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numlumps = 0; lumpinfo = NULL;
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{ // CPhipps - new wadfiles array used
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// open all the files, load headers, and count lumps
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int i;
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for (i=0; (size_t)i<numwadfiles; i++)
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W_AddFile(&wadfiles[i]);
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}
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if (!numlumps)
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I_Error ("W_Init: No files found");
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//jff 1/23/98
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// get all the sprites and flats into one marked block each
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// killough 1/24/98: change interface to use M_START/M_END explicitly
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// killough 4/17/98: Add namespace tags to each entry
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// killough 4/4/98: add colormap markers
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W_CoalesceMarkedResource("S_START", "S_END", ns_sprites);
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W_CoalesceMarkedResource("F_START", "F_END", ns_flats);
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W_CoalesceMarkedResource("C_START", "C_END", ns_colormaps);
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W_CoalesceMarkedResource("B_START", "B_END", ns_prboom);
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// killough 1/31/98: initialize lump hash table
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W_HashLumps();
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/* cph 2001/07/07 - separated cache setup */
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lprintf(LO_INFO,"W_InitCache\n");
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W_InitCache();
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}
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void W_ReleaseAllWads(void)
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{
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W_DoneCache();
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numwadfiles = 0;
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free(wadfiles);
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wadfiles = NULL;
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numlumps = 0;
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free(lumpinfo);
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lumpinfo = NULL;
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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 W_ReadLump(int lump, void *dest)
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{
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lumpinfo_t *l = lumpinfo + lump;
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#ifdef RANGECHECK
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if (lump >= numlumps)
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I_Error ("W_ReadLump: %i >= numlumps",lump);
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#endif
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{
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if (l->wadfile)
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{
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lseek(l->wadfile->handle, l->position, SEEK_SET);
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I_Read(l->wadfile->handle, dest, l->size);
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}
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}
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}
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