ref: b818f48f41895754dd9b470be407ba85cfea45bd
dir: /sys/src/games/doom/w_wad.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
#endif
#include "doomtype.h"
#include "m_swap.h"
#include "i_system.h"
#include "z_zone.h"
#include "w_wad.h"
//
// GLOBALS
//
// Location of each lump on disk.
lumpinfo_t* lumpinfo;
int numlumps;
void** lumpcache;
#define strcmpi strcasecmp
void strupr (char* s)
{
while (*s) { *s = toupper(*s); s++; }
}
vlong
filelength(int fd)
{
vlong l;
Dir *d;
d = dirfstat(fd);
if(d == nil)
sysfatal("dirfstat: %r");
l = d->length;
free(d);
return l; /* lump file lenghts in doom are ints */
}
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;
void *freefileinfo = nil;
// open the file and add to directory
// handle reload indicator.
if (filename[0] == '~')
{
filename++;
reloadname = filename;
reloadlump = numlumps;
}
if ( (handle = I_Open(filename)) == -1 )
{
printf (" couldn't open %s\n",filename);
return;
}
printf (" adding %s\n",filename);
startlump = numlumps;
if (cistrcmp (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
I_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 id\n", filename);
}
// ???modifiedgame = true;
}
header.numlumps = LONG(header.numlumps);
header.infotableofs = LONG(header.infotableofs);
length = header.numlumps*sizeof(filelump_t);
fileinfo = malloc (length); freefileinfo=fileinfo;
I_Seek (handle, header.infotableofs);
I_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 ; 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)
I_Close (handle);
if (freefileinfo)
free(freefileinfo);
}
//
// 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 = I_Open (reloadname)) == -1)
I_Error ("W_Reload: couldn't open %s",reloadname);
I_Read (handle, &header, sizeof(header));
lumpcount = LONG(header.numlumps);
header.infotableofs = LONG(header.infotableofs);
length = lumpcount*sizeof(filelump_t);
fileinfo = malloc (length);
I_Seek (handle, header.infotableofs);
I_Read (handle, fileinfo, length);
// Fill in lumpinfo
lump_p = &lumpinfo[reloadlump];
for (i=reloadlump ;
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);
}
I_Close (handle);
free(fileinfo);
}
//
// 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 fill 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 = I_Open (reloadname)) == -1)
I_Error ("W_ReadLump: couldn't open %s",reloadname);
}
else
handle = l->handle;
I_Seek (handle, l->position);
c = I_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)
I_Close (handle);
// ??? I_EndRead ();
}
//
// W_CacheLumpNum
//
void*
W_CacheLumpNum
( int lump,
int tag )
{
if ((unsigned)lump >= numlumps)
I_Error ("W_CacheLumpNum: %i >= numlumps",lump);
if (!lumpcache[lump])
{
// read the lump in
//printf ("cache miss on lump %i\n",lump);
Z_Malloc (W_LumpLength (lump), tag, &lumpcache[lump]);
W_ReadLump (lump, lumpcache[lump]);
}
else
{
//printf ("cache hit on lump %i\n",lump);
Z_ChangeTag (lumpcache[lump],tag);
}
return lumpcache[lump];
}
//
// W_CacheLumpName
//
void*
W_CacheLumpName
( char* name,
int tag )
{
return W_CacheLumpNum (W_GetNumForName(name), tag);
}
//
// 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)
{
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);
}