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physfs/archivers/wad.c

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/*
* WAD support routines for PhysicsFS.
*
* This driver handles DOOM engine archives ("wads").
* This format (but not this driver) was designed by id Software for use
* with the DOOM engine.
* The specs of the format are from the unofficial doom specs v1.666
* found here: http://www.gamers.org/dhs/helpdocs/dmsp1666.html
* The format of the archive: (from the specs)
*
* A WAD file has three parts:
* (1) a twelve-byte header
* (2) one or more "lumps"
* (3) a directory or "info table" that contains the names, offsets, and
* sizes of all the lumps in the WAD
*
* The header consists of three four-byte parts:
* (a) an ASCII string which must be either "IWAD" or "PWAD"
* (b) a 4-byte (long) integer which is the number of lumps in the wad
* (c) a long integer which is the file offset to the start of
* the directory
*
* The directory has one 16-byte entry for every lump. Each entry consists
* of three parts:
*
* (a) a long integer, the file offset to the start of the lump
* (b) a long integer, the size of the lump in bytes
* (c) an 8-byte ASCII string, the name of the lump, padded with zeros.
* For example, the "DEMO1" entry in hexadecimal would be
* (44 45 4D 4F 31 00 00 00)
*
* Note that there is no way to tell if an opened WAD archive is a
* IWAD or PWAD with this archiver.
* I couldn't think of a way to provide that information, without being too
* hacky.
* I don't think it's really that important though.
*
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Travis Wells, based on the GRP archiver by
* Ryan C. Gordon.
*/
#if (defined PHYSFS_SUPPORTS_WAD)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "physfs.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
typedef struct
{
char name[18];
PHYSFS_uint32 startPos;
PHYSFS_uint32 size;
} WADentry;
typedef struct
{
char *filename;
PHYSFS_sint64 last_mod_time;
PHYSFS_uint32 entryCount;
PHYSFS_uint32 entryOffset;
WADentry *entries;
} WADinfo;
typedef struct
{
void *handle;
WADentry *entry;
PHYSFS_uint32 curPos;
} WADfileinfo;
static void WAD_dirClose(dvoid *opaque)
{
WADinfo *info = ((WADinfo *) opaque);
allocator.Free(info->filename);
allocator.Free(info->entries);
allocator.Free(info);
} /* WAD_dirClose */
static PHYSFS_sint64 WAD_read(fvoid *opaque, void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
WADfileinfo *finfo = (WADfileinfo *) opaque;
WADentry *entry = finfo->entry;
PHYSFS_uint32 bytesLeft = entry->size - finfo->curPos;
PHYSFS_uint32 objsLeft = (bytesLeft / objSize);
PHYSFS_sint64 rc;
if (objsLeft < objCount)
objCount = objsLeft;
rc = __PHYSFS_platformRead(finfo->handle, buffer, objSize, objCount);
if (rc > 0)
finfo->curPos += (PHYSFS_uint32) (rc * objSize);
return(rc);
} /* WAD_read */
static PHYSFS_sint64 WAD_write(fvoid *opaque, const void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* WAD_write */
static int WAD_eof(fvoid *opaque)
{
WADfileinfo *finfo = (WADfileinfo *) opaque;
WADentry *entry = finfo->entry;
return(finfo->curPos >= entry->size);
} /* WAD_eof */
static PHYSFS_sint64 WAD_tell(fvoid *opaque)
{
return(((WADfileinfo *) opaque)->curPos);
} /* WAD_tell */
static int WAD_seek(fvoid *opaque, PHYSFS_uint64 offset)
{
WADfileinfo *finfo = (WADfileinfo *) opaque;
WADentry *entry = finfo->entry;
int rc;
BAIL_IF_MACRO(offset < 0, ERR_INVALID_ARGUMENT, 0);
BAIL_IF_MACRO(offset >= entry->size, ERR_PAST_EOF, 0);
rc = __PHYSFS_platformSeek(finfo->handle, entry->startPos + offset);
if (rc)
finfo->curPos = (PHYSFS_uint32) offset;
return(rc);
} /* WAD_seek */
static PHYSFS_sint64 WAD_fileLength(fvoid *opaque)
{
WADfileinfo *finfo = (WADfileinfo *) opaque;
return((PHYSFS_sint64) finfo->entry->size);
} /* WAD_fileLength */
static int WAD_fileClose(fvoid *opaque)
{
WADfileinfo *finfo = (WADfileinfo *) opaque;
BAIL_IF_MACRO(!__PHYSFS_platformClose(finfo->handle), NULL, 0);
allocator.Free(finfo);
return(1);
} /* WAD_fileClose */
static int wad_open(const char *filename, int forWriting,
void **fh, PHYSFS_uint32 *count,PHYSFS_uint32 *offset)
{
PHYSFS_uint8 buf[4];
*fh = NULL;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, 0);
*fh = __PHYSFS_platformOpenRead(filename);
BAIL_IF_MACRO(*fh == NULL, NULL, 0);
if (__PHYSFS_platformRead(*fh, buf, 4, 1) != 1)
goto openWad_failed;
if (memcmp(buf, "IWAD", 4) != 0 && memcmp(buf, "PWAD", 4) != 0)
{
__PHYSFS_setError(ERR_UNSUPPORTED_ARCHIVE);
goto openWad_failed;
} /* if */
if (__PHYSFS_platformRead(*fh, count, sizeof (PHYSFS_uint32), 1) != 1)
goto openWad_failed;
*count = PHYSFS_swapULE32(*count);
if (__PHYSFS_platformRead(*fh, offset, sizeof (PHYSFS_uint32), 1) != 1)
goto openWad_failed;
*offset = PHYSFS_swapULE32(*offset);
return(1);
openWad_failed:
if (*fh != NULL)
__PHYSFS_platformClose(*fh);
*count = -1;
*fh = NULL;
return(0);
} /* wad_open */
static int WAD_isArchive(const char *filename, int forWriting)
{
void *fh;
PHYSFS_uint32 fileCount,offset;
int retval = wad_open(filename, forWriting, &fh, &fileCount,&offset);
if (fh != NULL)
__PHYSFS_platformClose(fh);
return(retval);
} /* WAD_isArchive */
static int wad_entry_cmp(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
if (one != two)
{
const WADentry *a = (const WADentry *) _a;
return(strcmp(a[one].name, a[two].name));
} /* if */
return 0;
} /* wad_entry_cmp */
static void wad_entry_swap(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
if (one != two)
{
WADentry tmp;
WADentry *first = &(((WADentry *) _a)[one]);
WADentry *second = &(((WADentry *) _a)[two]);
memcpy(&tmp, first, sizeof (WADentry));
memcpy(first, second, sizeof (WADentry));
memcpy(second, &tmp, sizeof (WADentry));
} /* if */
} /* wad_entry_swap */
static int wad_load_entries(const char *name, int forWriting, WADinfo *info)
{
void *fh = NULL;
PHYSFS_uint32 fileCount;
PHYSFS_uint32 directoryOffset;
WADentry *entry;
char lastDirectory[9];
lastDirectory[8] = 0; /* Make sure lastDirectory stays null-terminated. */
BAIL_IF_MACRO(!wad_open(name, forWriting, &fh, &fileCount,&directoryOffset), NULL, 0);
info->entryCount = fileCount;
info->entries = (WADentry *) allocator.Malloc(sizeof(WADentry)*fileCount);
if (info->entries == NULL)
{
__PHYSFS_platformClose(fh);
BAIL_MACRO(ERR_OUT_OF_MEMORY, 0);
} /* if */
__PHYSFS_platformSeek(fh,directoryOffset);
for (entry = info->entries; fileCount > 0; fileCount--, entry++)
{
if (__PHYSFS_platformRead(fh, &entry->startPos, 4, 1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
if (__PHYSFS_platformRead(fh, &entry->size, 4, 1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
if (__PHYSFS_platformRead(fh, &entry->name, 8, 1) != 1)
{
__PHYSFS_platformClose(fh);
return(0);
} /* if */
entry->name[8] = '\0'; /* name might not be null-terminated in file. */
entry->size = PHYSFS_swapULE32(entry->size);
entry->startPos = PHYSFS_swapULE32(entry->startPos);
} /* for */
__PHYSFS_platformClose(fh);
__PHYSFS_sort(info->entries, info->entryCount,
wad_entry_cmp, wad_entry_swap);
return(1);
} /* wad_load_entries */
static void *WAD_openArchive(const char *name, int forWriting)
{
PHYSFS_sint64 modtime = __PHYSFS_platformGetLastModTime(name);
WADinfo *info = (WADinfo *) allocator.Malloc(sizeof (WADinfo));
BAIL_IF_MACRO(info == NULL, ERR_OUT_OF_MEMORY, NULL);
memset(info, '\0', sizeof (WADinfo));
info->filename = (char *) allocator.Malloc(strlen(name) + 1);
GOTO_IF_MACRO(!info->filename, ERR_OUT_OF_MEMORY, WAD_openArchive_failed);
if (!wad_load_entries(name, forWriting, info))
goto WAD_openArchive_failed;
strcpy(info->filename, name);
info->last_mod_time = modtime;
return(info);
WAD_openArchive_failed:
if (info != NULL)
{
if (info->filename != NULL)
allocator.Free(info->filename);
if (info->entries != NULL)
allocator.Free(info->entries);
allocator.Free(info);
} /* if */
return(NULL);
} /* WAD_openArchive */
static void WAD_enumerateFiles(dvoid *opaque, const char *dname,
int omitSymLinks, PHYSFS_EnumFilesCallback cb,
const char *origdir, void *callbackdata)
{
WADinfo *info = ((WADinfo *) opaque);
WADentry *entry = info->entries;
PHYSFS_uint32 max = info->entryCount;
PHYSFS_uint32 i;
const char *name;
char *sep;
if (*dname == '\0') /* root directory enumeration? */
{
for (i = 0; i < max; i++, entry++)
{
name = entry->name;
if (strchr(name, '/') == NULL)
cb(callbackdata, origdir, name);
} /* for */
} /* if */
else
{
for (i = 0; i < max; i++, entry++)
{
name = entry->name;
sep = strchr(name, '/');
if (sep != NULL)
{
if (strncmp(dname, name, (sep - name)) == 0)
cb(callbackdata, origdir, sep + 1);
} /* if */
} /* for */
} /* else */
} /* WAD_enumerateFiles */
static WADentry *wad_find_entry(WADinfo *info, const char *name)
{
WADentry *a = info->entries;
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
PHYSFS_sint32 middle;
int rc;
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
rc = strcmp(name, a[middle].name);
if (rc == 0) /* found it! */
return(&a[middle]);
else if (rc > 0)
lo = middle + 1;
else
hi = middle - 1;
} /* while */
BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* wad_find_entry */
static int WAD_exists(dvoid *opaque, const char *name)
{
return(wad_find_entry(((WADinfo *) opaque), name) != NULL);
} /* WAD_exists */
static int WAD_isDirectory(dvoid *opaque, const char *name, int *fileExists)
{
WADentry *entry = wad_find_entry(((WADinfo *) opaque), name);
if (entry != NULL)
{
char *n;
*fileExists = 1;
/* Can't be a directory if it's a subdirectory. */
if (strchr(entry->name, '/') != NULL)
return(0);
/* Check if it matches "MAP??" or "E?M?" ... */
n = entry->name;
if ((n[0] == 'E' && n[2] == 'M') ||
(n[0] == 'M' && n[1] == 'A' && n[2] == 'P' && n[6] == 0))
{
return(1);
} /* if */
return(0);
} /* if */
else
{
*fileExists = 0;
return(0);
} /* else */
} /* WAD_isDirectory */
static int WAD_isSymLink(dvoid *opaque, const char *name, int *fileExists)
{
*fileExists = WAD_exists(opaque, name);
return(0); /* never symlinks in a wad. */
} /* WAD_isSymLink */
static PHYSFS_sint64 WAD_getLastModTime(dvoid *opaque,
const char *name,
int *fileExists)
{
WADinfo *info = ((WADinfo *) opaque);
PHYSFS_sint64 retval = -1;
*fileExists = (wad_find_entry(info, name) != NULL);
if (*fileExists) /* use time of WAD itself in the physical filesystem. */
retval = info->last_mod_time;
return(retval);
} /* WAD_getLastModTime */
static fvoid *WAD_openRead(dvoid *opaque, const char *fnm, int *fileExists)
{
WADinfo *info = ((WADinfo *) opaque);
WADfileinfo *finfo;
WADentry *entry;
entry = wad_find_entry(info, fnm);
*fileExists = (entry != NULL);
BAIL_IF_MACRO(entry == NULL, NULL, NULL);
finfo = (WADfileinfo *) allocator.Malloc(sizeof (WADfileinfo));
BAIL_IF_MACRO(finfo == NULL, ERR_OUT_OF_MEMORY, NULL);
finfo->handle = __PHYSFS_platformOpenRead(info->filename);
if ( (finfo->handle == NULL) ||
(!__PHYSFS_platformSeek(finfo->handle, entry->startPos)) )
{
allocator.Free(finfo);
return(NULL);
} /* if */
finfo->curPos = 0;
finfo->entry = entry;
return(finfo);
} /* WAD_openRead */
static fvoid *WAD_openWrite(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* WAD_openWrite */
static fvoid *WAD_openAppend(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* WAD_openAppend */
static int WAD_remove(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* WAD_remove */
static int WAD_mkdir(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* WAD_mkdir */
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_WAD =
{
"WAD",
WAD_ARCHIVE_DESCRIPTION,
"Travis Wells <traviswells@mchsi.com>",
"http://www.3dmm2.com/doom/",
};
const PHYSFS_Archiver __PHYSFS_Archiver_WAD =
{
&__PHYSFS_ArchiveInfo_WAD,
WAD_isArchive, /* isArchive() method */
WAD_openArchive, /* openArchive() method */
WAD_enumerateFiles, /* enumerateFiles() method */
WAD_exists, /* exists() method */
WAD_isDirectory, /* isDirectory() method */
WAD_isSymLink, /* isSymLink() method */
WAD_getLastModTime, /* getLastModTime() method */
WAD_openRead, /* openRead() method */
WAD_openWrite, /* openWrite() method */
WAD_openAppend, /* openAppend() method */
WAD_remove, /* remove() method */
WAD_mkdir, /* mkdir() method */
WAD_dirClose, /* dirClose() method */
WAD_read, /* read() method */
WAD_write, /* write() method */
WAD_eof, /* eof() method */
WAD_tell, /* tell() method */
WAD_seek, /* seek() method */
WAD_fileLength, /* fileLength() method */
WAD_fileClose /* fileClose() method */
};
#endif /* defined PHYSFS_SUPPORTS_WAD */
/* end of wad.c ... */
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