ref: c89633a6f115ee889ab5900b466578165955ec5a
dir: /w_wad.c/
// W_wad.c
// HEADER FILES ------------------------------------------------------------
#include "h2stdinc.h"
#include "doomdef.h"
// MACROS ------------------------------------------------------------------
/* compatibility with DOS/Windows */
#ifndef O_BINARY
# if defined(_O_BINARY)
# define O_BINARY _O_BINARY
# else
# define O_BINARY 0
# endif
#endif
// TYPES -------------------------------------------------------------------
typedef struct
{
char identification[4]; // should be IWAD
int numlumps;
int infotableofs;
} wadinfo_t;
typedef struct
{
int filepos;
int size;
char name[8];
} filelump_t;
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
// PUBLIC DATA DEFINITIONS -------------------------------------------------
const char *waddir;
lumpinfo_t *lumpinfo; // location of each lump on disk
int numlumps;
void **lumpcache;
// PRIVATE DATA DEFINITIONS ------------------------------------------------
// CODE --------------------------------------------------------------------
boolean W_IsWadPresent(const char *filename)
{
char path[MAX_OSPATH];
int handle = -1;
/* try the directory from the command line or
* from the shared data environment variable.
*/
if (waddir && *waddir)
{
snprintf (path, sizeof(path), "%s/%s", waddir, filename);
handle = open(path, OREAD);
}
#if !defined(_NO_USERDIRS)
if (handle == -1) /* Try UserDIR */
{
snprintf (path, sizeof(path), "%s%s", basePath, filename);
handle = open(path, OREAD);
}
#endif /* !_NO_USERDIRS */
if (handle == -1) /* Now try CWD */
{
handle = open(filename, OREAD);
}
if (handle == -1)
return false; /* Didn't find the file. */
close(handle);
return true;
}
//==========================================================================
//
// W_AddFile
//
// All files are optional, but at least one file must be found.
// Files with a .wad extension are wadlink files with multiple lumps,
// other files are single lumps with the base filename for the lump name.
//
//==========================================================================
void W_AddFile(const char *filename)
{
wadinfo_t header;
lumpinfo_t *lump_p;
char path[MAX_OSPATH];
int handle, length;
int startlump;
filelump_t *fileinfo, singleinfo;
filelump_t *freeFileInfo;
int i;
handle = open(filename, OREAD);
if (handle < 0)
return; /* Didn't find the file. */
startlump = numlumps;
if (strcasecmp(filename + strlen(filename) - 3, "wad") != 0)
{ // Single lump file
fileinfo = &singleinfo;
freeFileInfo = NULL;
singleinfo.filepos = 0;
singleinfo.size = LONG(filelength(handle));
M_ExtractFileBase(filename, singleinfo.name);
numlumps++;
}
else
{ // WAD file
read(handle, &header, sizeof(header));
if (strncmp(header.identification, "IWAD", 4) != 0)
{
if (strncmp(header.identification, "PWAD", 4) != 0)
{ // Bad file id
I_Error("Wad file %s doesn't have IWAD or PWAD id\n", filename);
}
}
header.numlumps = LONG(header.numlumps);
header.infotableofs = LONG(header.infotableofs);
length = header.numlumps * sizeof(filelump_t);
fileinfo = (filelump_t *) malloc(length);
if (!fileinfo)
{
I_Error("W_AddFile: fileinfo malloc failed\n");
}
freeFileInfo = fileinfo;
seek(handle, header.infotableofs, 0);
read(handle, fileinfo, length);
numlumps += header.numlumps;
}
// Fill in lumpinfo
lumpinfo = (lumpinfo_t *) realloc(lumpinfo, numlumps * sizeof(lumpinfo_t));
if (!lumpinfo)
{
I_Error("Couldn't realloc lumpinfo");
}
lump_p = &lumpinfo[startlump];
for (i = startlump; i < numlumps; i++, lump_p++, fileinfo++)
{
memset(lump_p->name, 0, 8);
lump_p->handle = handle;
lump_p->position = LONG(fileinfo->filepos);
lump_p->size = LONG(fileinfo->size);
strncpy(lump_p->name, fileinfo->name, 8);
}
if (freeFileInfo)
{
free(freeFileInfo);
}
}
//==========================================================================
//
// 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 can
// override an earlier one.
//
//==========================================================================
void W_InitMultipleFiles(const char **filenames)
{
int size;
// Open all the files, load headers, and count lumps
numlumps = 0;
lumpinfo = (lumpinfo_t *) malloc(1); // Will be realloced as lumps are added
for ( ; *filenames; filenames++)
{
W_AddFile(*filenames);
}
if (!numlumps)
{
I_Error("W_InitMultipleFiles: no files found");
}
// Set up caching
size = numlumps * sizeof(*lumpcache);
lumpcache = (void **) 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(const char *filename)
{
const 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(const char *name)
{
char name8[9];
lumpinfo_t *lump_p;
// Make the name into two integers for easy compares
memset(name8, 0, sizeof(name8));
strncpy(name8, name, 8);
strupr(name8); // case insensitive
// Scan backwards so patch lump files take precedence
lump_p = lumpinfo + numlumps;
while (lump_p-- != lumpinfo)
{
if (memcmp(lump_p->name, name8, 8) == 0)
{
return (int)(lump_p - lumpinfo);
}
}
return -1;
}
//==========================================================================
//
// W_GetNumForName
//
// Calls W_CheckNumForName, but bombs out if not found.
//
//==========================================================================
int W_GetNumForName (const char *name)
{
int i;
i = W_CheckNumForName(name);
if (i != -1)
{
return i;
}
I_Error("W_GetNumForName: %s not found!", name);
return -1;
}
//==========================================================================
//
// 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;
if (lump >= numlumps)
{
I_Error("W_ReadLump: %i >= numlumps", lump);
}
l = lumpinfo+lump;
seek(l->handle, l->position, 0);
c = read(l->handle, dest, l->size);
if (c < l->size)
{
I_Error("W_ReadLump: only read %i of %i on lump %i",
c, l->size, lump);
}
}
//==========================================================================
//
// W_CacheLumpNum
//
//==========================================================================
void *W_CacheLumpNum(int lump, int tag)
{
if ((unsigned)lump >= numlumps)
{
I_Error("W_CacheLumpNum: %i >= numlumps", lump);
}
if (!lumpcache[lump])
{ // Need to read the lump in
Z_Malloc(W_LumpLength(lump), tag, &lumpcache[lump]);
W_ReadLump(lump, lumpcache[lump]);
}
else
{
Z_ChangeTag(lumpcache[lump], tag);
}
return lumpcache[lump];
}
//==========================================================================
//
// W_CacheLumpName
//
//==========================================================================
void *W_CacheLumpName(const char *name, int tag)
{
return W_CacheLumpNum(W_GetNumForName(name), tag);
}
//==========================================================================
//
// W_Profile
//
//==========================================================================
// Ripped out for Heretic
/*
static int info[2500][10];
static 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);
}
*/