w_wad.c
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上传日期:2021-05-12
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文件大小:11k
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射击游戏
开发平台:
Visual C++
- // Emacs style mode select -*- C++ -*-
- //-----------------------------------------------------------------------------
- //
- // $Id:$
- //
- // Copyright (C) 1993-1996 by id Software, Inc.
- //
- // This source is available for distribution and/or modification
- // only under the terms of the DOOM Source Code License as
- // published by id Software. All rights reserved.
- //
- // The source is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
- // for more details.
- //
- // $Log:$
- //
- // DESCRIPTION:
- // Handles WAD file header, directory, lump I/O.
- //
- //-----------------------------------------------------------------------------
- static const char
- rcsid[] = "$Id: w_wad.c,v 1.5 1997/02/03 16:47:57 b1 Exp $";
- #ifdef NORMALUNIX
- #include <ctype.h>
- #include <sys/types.h>
- #include <string.h>
- #include <unistd.h>
- #include <malloc.h>
- #include <fcntl.h>
- #include <sys/stat.h>
- #include <alloca.h>
- #define O_BINARY 0
- #else
- #include <stdio.h>
- #include <stdlib.h>
- #include <io.h>
- #include <malloc.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #endif
- #include "doomtype.h"
- #include "m_swap.h"
- #include "i_system.h"
- #include "z_zone.h"
- #ifdef __GNUG__
- #pragma implementation "w_wad.h"
- #endif
- #include "w_wad.h"
- char MsgText[256];
- void WriteDebug(char *);
- //
- // GLOBALS
- //
- // Location of each lump on disk.
- lumpinfo_t* lumpinfo;
- int numlumps;
- void** lumpcache;
- //#define strcmpi strcasecmp // This is a redefinition of a standard 'C' function -- not necessary...
- //void strupr (char* s)
- //{
- // while (*s) { *s = toupper(*s); s++; }
- //}
- /* This is a redefinition of a standard 'C' function -- not necessary...
- int filelength (int handle)
- {
- struct stat fileinfo;
- if (fstat (handle,&fileinfo) == -1)
- I_Error ("Error fstating");
- return fileinfo.st_size;
- }
- */
- void
- ExtractFileBase
- ( char* path,
- char* dest )
- {
- char* src;
- int length;
- src = path + strlen(path) - 1;
- // back up until a or the start
- while (src != path
- && *(src-1) != '\'
- && *(src-1) != '/')
- {
- src--;
- }
- // copy up to eight characters
- memset (dest,0,8);
- length = 0;
- while (*src && *src != '.')
- {
- if (++length == 9)
- I_Error ("Filename base of %s >8 chars",path);
- *dest++ = toupper((int)*src++);
- }
- }
- //
- // LUMP BASED ROUTINES.
- //
- //
- // W_AddFile
- // All files are optional, but at least one file must be
- // found (PWAD, if all required lumps are present).
- // Files with a .wad extension are wadlink files
- // with multiple lumps.
- // Other files are single lumps with the base filename
- // for the lump name.
- //
- // If filename starts with a tilde, the file is handled
- // specially to allow map reloads.
- // But: the reload feature is a fragile hack...
- int reloadlump;
- char* reloadname;
- void W_AddFile (char *filename)
- {
- wadinfo_t header;
- lumpinfo_t* lump_p;
- unsigned i;
- int handle;
- int length;
- int startlump;
- filelump_t* fileinfo;
- filelump_t singleinfo;
- int storehandle;
- // open the file and add to directory
- // handle reload indicator.
- if (filename[0] == '~')
- {
- filename++;
- reloadname = filename;
- reloadlump = numlumps;
- }
- if ( (handle = open (filename,O_RDONLY | O_BINARY)) == -1)
- {
- printf (" couldn't open %sn",filename);
- return;
- }
- sprintf (MsgText," adding %sn",filename);
- WriteDebug(MsgText);
- startlump = numlumps;
- if (strcmpi (filename+strlen(filename)-3 , "wad" ) )
- {
- // single lump file
- fileinfo = &singleinfo;
- singleinfo.filepos = 0;
- singleinfo.size = LONG(filelength(handle));
- ExtractFileBase (filename, singleinfo.name);
- numlumps++;
- }
- else
- {
- // WAD file
- read (handle, &header, sizeof(header));
- if (strncmp(header.identification,"IWAD",4))
- {
- // Homebrew levels?
- if (strncmp(header.identification,"PWAD",4))
- {
- I_Error ("Wad file %s doesn't have IWAD "
- "or PWAD idn", filename);
- }
- // ???modifiedgame = true;
- }
- header.numlumps = LONG(header.numlumps);
- header.infotableofs = LONG(header.infotableofs);
- length = header.numlumps*sizeof(filelump_t);
- fileinfo = alloca (length);
- lseek (handle, header.infotableofs, SEEK_SET);
- read (handle, fileinfo, length);
- numlumps += header.numlumps;
- }
- // Fill in lumpinfo
- lumpinfo = realloc (lumpinfo, numlumps*sizeof(lumpinfo_t));
- if (!lumpinfo)
- I_Error ("Couldn't realloc lumpinfo");
- lump_p = &lumpinfo[startlump];
- storehandle = reloadname ? -1 : handle;
- for (i=startlump ; (int)i<numlumps ; i++,lump_p++, fileinfo++)
- {
- lump_p->handle = storehandle;
- lump_p->position = LONG(fileinfo->filepos);
- lump_p->size = LONG(fileinfo->size);
- strncpy (lump_p->name, fileinfo->name, 8);
- }
- if (reloadname)
- close (handle);
- }
- //
- // W_Reload
- // Flushes any of the reloadable lumps in memory
- // and reloads the directory.
- //
- void W_Reload (void)
- {
- wadinfo_t header;
- int lumpcount;
- lumpinfo_t* lump_p;
- unsigned i;
- int handle;
- int length;
- filelump_t* fileinfo;
- if (!reloadname)
- return;
- if ( (handle = open (reloadname,O_RDONLY | O_BINARY)) == -1)
- I_Error ("W_Reload: couldn't open %s",reloadname);
- read (handle, &header, sizeof(header));
- lumpcount = LONG(header.numlumps);
- header.infotableofs = LONG(header.infotableofs);
- length = lumpcount*sizeof(filelump_t);
- fileinfo = alloca (length);
- lseek (handle, header.infotableofs, SEEK_SET);
- read (handle, fileinfo, length);
- // Fill in lumpinfo
- lump_p = &lumpinfo[reloadlump];
- for (i=reloadlump ;
- (int)i<reloadlump+lumpcount ;
- i++,lump_p++, fileinfo++)
- {
- if (lumpcache[i])
- Z_Free (lumpcache[i]);
- lump_p->position = LONG(fileinfo->filepos);
- lump_p->size = LONG(fileinfo->size);
- }
- close (handle);
- }
- //
- // W_InitMultipleFiles
- // Pass a null terminated list of files to use.
- // All files are optional, but at least one file
- // must be found.
- // Files with a .wad extension are idlink files
- // with multiple lumps.
- // Other files are single lumps with the base filename
- // for the lump name.
- // Lump names can appear multiple times.
- // The name searcher looks backwards, so a later file
- // does override all earlier ones.
- //
- void W_InitMultipleFiles (char** filenames)
- {
- int size;
- // open all the files, load headers, and count lumps
- numlumps = 0;
- // will be realloced as lumps are added
- lumpinfo = malloc(1);
- for ( ; *filenames ; filenames++)
- W_AddFile (*filenames);
- if (!numlumps)
- I_Error ("W_InitFiles: no files found");
- // set up caching
- size = numlumps * sizeof(*lumpcache);
- lumpcache = malloc (size);
- if (!lumpcache)
- I_Error ("Couldn't allocate lumpcache");
- memset (lumpcache,0, size);
- }
- //
- // W_InitFile
- // Just initialize from a single file.
- //
- void W_InitFile (char* filename)
- {
- char* names[2];
- names[0] = filename;
- names[1] = NULL;
- W_InitMultipleFiles (names);
- }
- //
- // W_NumLumps
- //
- int W_NumLumps (void)
- {
- return numlumps;
- }
- //
- // W_CheckNumForName
- // Returns -1 if name not found.
- //
- int W_CheckNumForName (char* name)
- {
- union {
- char s[9];
- int x[2];
- } name8;
- int v1;
- int v2;
- lumpinfo_t* lump_p;
- // make the name into two integers for easy compares
- strncpy (name8.s,name,8);
- // in case the name was a full 8 chars
- name8.s[8] = 0;
- // case insensitive
- strupr (name8.s);
- v1 = name8.x[0];
- v2 = name8.x[1];
- // scan backwards so patch lump files take precedence
- lump_p = lumpinfo + numlumps;
- while (lump_p-- != lumpinfo)
- {
- if ( *(int *)lump_p->name == v1
- && *(int *)&lump_p->name[4] == v2)
- {
- return lump_p - lumpinfo;
- }
- }
- // TFB. Not found.
- return -1;
- }
- //
- // W_GetNumForName
- // Calls W_CheckNumForName, but bombs out if not found.
- //
- int W_GetNumForName (char* name)
- {
- int i;
- i = W_CheckNumForName (name);
- if (i == -1)
- I_Error ("W_GetNumForName: %s not found!", name);
- return i;
- }
- //
- // W_LumpLength
- // Returns the buffer size needed to load the given lump.
- //
- int W_LumpLength (int lump)
- {
- if (lump >= numlumps)
- I_Error ("W_LumpLength: %i >= numlumps",lump);
- return lumpinfo[lump].size;
- }
- //
- // W_ReadLump
- // Loads the lump into the given buffer,
- // which must be >= W_LumpLength().
- //
- void
- W_ReadLump
- ( int lump,
- void* dest )
- {
- int c;
- lumpinfo_t* l;
- int handle;
- if (lump >= numlumps)
- I_Error ("W_ReadLump: %i >= numlumps",lump);
- l = lumpinfo+lump;
- // ??? I_BeginRead ();
- if (l->handle == -1)
- {
- // reloadable file, so use open / read / close
- if ( (handle = open (reloadname,O_RDONLY | O_BINARY)) == -1)
- I_Error ("W_ReadLump: couldn't open %s",reloadname);
- }
- else
- handle = l->handle;
- lseek (handle, l->position, SEEK_SET);
- c = read (handle, dest, l->size);
- if (c < l->size)
- I_Error ("W_ReadLump: only read %i of %i on lump %i",
- c,l->size,lump);
- if (l->handle == -1)
- close (handle);
- // ??? I_EndRead ();
- }
- //
- // W_CacheLumpNum
- //
- void*
- W_CacheLumpNum
- ( int lump,
- int tag )
- {
- byte* ptr;
- if ((unsigned)lump >= (unsigned)numlumps)
- I_Error ("W_CacheLumpNum: %i >= numlumps",lump);
- if (!lumpcache[lump])
- {
- // read the lump in
- //printf ("cache miss on lump %in",lump);
- ptr = Z_Malloc (W_LumpLength (lump), tag, &lumpcache[lump]);
- W_ReadLump (lump, lumpcache[lump]);
- }
- else
- {
- //printf ("cache hit on lump %in",lump);
- Z_ChangeTag (lumpcache[lump],tag);
- }
- return lumpcache[lump];
- }
- //
- // W_CacheLumpName
- //
- void*
- W_CacheLumpName
- ( char* name,
- int tag )
- {
- int LumpNum;
- LumpNum = W_GetNumForName(name);
- if (LumpNum >= 0)
- return W_CacheLumpNum(LumpNum, tag);
- else
- return NULL;
- }
- //
- // W_Profile
- //
- int info[2500][10];
- int profilecount;
- void W_Profile (void)
- {
- int i;
- memblock_t* block;
- void* ptr;
- char ch;
- FILE* f;
- int j;
- char name[9];
- for (i=0 ; i<numlumps ; i++)
- {
- ptr = lumpcache[i];
- if (!ptr)
- {
- ch = ' ';
- continue;
- }
- else
- {
- block = (memblock_t *) ( (byte *)ptr - sizeof(memblock_t));
- if (block->tag < PU_PURGELEVEL)
- ch = 'S';
- else
- ch = 'P';
- }
- info[i][profilecount] = ch;
- }
- profilecount++;
- f = fopen ("waddump.txt","w");
- name[8] = 0;
- for (i=0 ; i<numlumps ; i++)
- {
- memcpy (name,lumpinfo[i].name,8);
- for (j=0 ; j<8 ; j++)
- if (!name[j])
- break;
- for ( ; j<8 ; j++)
- name[j] = ' ';
- fprintf (f,"%s ",name);
- for (j=0 ; j<profilecount ; j++)
- fprintf (f," %c",info[i][j]);
- fprintf (f,"n");
- }
- fclose (f);
- }