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physfs/archivers/mix.c

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/*
* MIX support routines for PhysicsFS.
*
* This driver handles old archives used in the famous games
* Command&Conquer Tiberium Dawn and Command&Conquer Red Alert.
*
* Newer MIX files as they are used in C&C Tiberium Sun and C&C Red Alert 2
* aren't supported yet. Keep your eyes open for future updates.
*
* A MIX file has three parts:
* (1) Header
* 16bit integer -> number of files stored in this MIX
* 32bit integer -> filesize
* (2) "Directory"
* 32bit integer -> hash of the filename
* 32bit integer -> starting offset in the MIX
* 32bit integer -> end offset in the MIX
* (3) Data (BODY)
* All data comes here
*
* NOTES:
* The offsets are relative to the body. So offset 0 is directly after
* the directory.
*
* Filenames only exist as hashes. So enumerate_files() will only report all
* hashes. Searching a filename in hashes is extremly quick so I decided not
* to include any sorting routines after then opening of the archive.
*
*
* I found the structure of MIX files here:
* http://www.geocities.com/SiliconValley/8682/cncmap1f.txt
*
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Sebastian Steinhauer <steini@steini-welt.de>
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if (defined PHYSFS_SUPPORTS_MIX)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "physfs.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
typedef struct
{
PHYSFS_uint16 num_files;
PHYSFS_uint32 filesize;
} MIXheader;
typedef struct
{
PHYSFS_uint32 hash;
PHYSFS_uint32 start_offset;
PHYSFS_uint32 end_offset;
} MIXentry;
typedef struct
{
char *filename; /* filename of the archive */
MIXentry *entry; /* list of entries */
MIXheader header; /* the header of the MIX file */
PHYSFS_uint32 delta; /* size of header + entries */
} MIXinfo;
typedef struct
{
PHYSFS_uint64 size; /* filesize */
PHYSFS_uint64 cur_pos; /* position in this file */
MIXentry *entry; /* pointer to the MIX entry */
MIXinfo *info; /* pointer to our MIXinfo */
void *handle; /* filehandle */
} MIXfileinfo;
static PHYSFS_uint32 MIX_hash(const char *name)
{
PHYSFS_uint32 id = 0;
PHYSFS_uint32 a = 0;
PHYSFS_uint32 i = 0;
PHYSFS_uint32 l;
PHYSFS_uint32 j;
l = strlen(name);
while (i < l)
{
a = 0;
for(j = 0; j < 4; j++)
{
a >>= 8;
if (i < l)
{
a += (unsigned int) (name[i]) << 24;
i++;
} /* if */
} /* for */
id = (id << 1 | id >> 31) + a;
} /* while */
/* a bit debuggin :)
/printf("Filename %s -> %X\n",name,id); */
return(id);
} /* MIX_hash */
static void MIX_dirClose(dvoid *opaque)
{
MIXinfo *info = ((MIXinfo *) opaque);
allocator.Free(info->entry);
allocator.Free(info->filename);
} /* MIX_dirClose */
static PHYSFS_sint64 MIX_read(fvoid *opaque, void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
MIXfileinfo *finfo = (MIXfileinfo *) opaque;
MIXentry *entry = finfo->entry;
PHYSFS_uint32 read;
/* set position in the archive */
__PHYSFS_platformSeek(finfo->handle,
finfo->info->delta +
entry->start_offset +
finfo->cur_pos);
/* read n bytes */
read = __PHYSFS_platformRead(finfo->handle, buffer, objSize, objCount);
/* keep filepointer up to date */
if (read)
finfo->cur_pos += read * objSize;
return(read);
} /* MIX_read */
static PHYSFS_sint64 MIX_write(fvoid *opaque, const void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* MIX_write */
static int MIX_eof(fvoid *opaque)
{
MIXfileinfo *fifo = (MIXfileinfo *) opaque;
return(fifo->cur_pos >= fifo->size);
} /* MIX_eof */
static PHYSFS_sint64 MIX_tell(fvoid *opaque)
{
return(((MIXfileinfo *) opaque)->cur_pos);
} /* MIX_tell */
static int MIX_seek(fvoid *opaque, PHYSFS_uint64 offset)
{
MIXfileinfo *h = (MIXfileinfo *) opaque;
BAIL_IF_MACRO(offset < 0, ERR_INVALID_ARGUMENT, 0);
BAIL_IF_MACRO(offset >= h->size, ERR_PAST_EOF, 0);
h->cur_pos = offset;
return(1);
} /* MIX_seek */
static PHYSFS_sint64 MIX_fileLength(fvoid *opaque)
{
return (((MIXfileinfo *) opaque)->size);
} /* MIX_fileLength */
static int MIX_fileClose(fvoid *opaque)
{
MIXfileinfo *finfo = (MIXfileinfo *) opaque;
__PHYSFS_platformClose(finfo->handle);
allocator.Free(finfo);
return(1);
} /* MIX_fileClose */
static int MIX_isArchive(const char *filename, int forWriting)
{
/* !!! FIXME:
write a simple detection routine for MIX files.
Unfortunaly MIX files have no ID in the header.
*/
return(1);
} /* MIX_isArchive */
/*
* Read an unsigned 32-bit int and swap to native byte order.
*/
static int readui32(void *in, PHYSFS_uint32 *val)
{
PHYSFS_uint32 v;
BAIL_IF_MACRO(__PHYSFS_platformRead(in, &v, sizeof (v), 1) != 1, NULL, 0);
*val = PHYSFS_swapULE32(v);
return(1);
} /* readui32 */
/*
* Read an unsigned 16-bit int and swap to native byte order.
*/
static int readui16(void *in, PHYSFS_uint16 *val)
{
PHYSFS_uint16 v;
BAIL_IF_MACRO(__PHYSFS_platformRead(in, &v, sizeof (v), 1) != 1, NULL, 0);
*val = PHYSFS_swapULE16(v);
return(1);
} /* readui16 */
static void *MIX_openArchive(const char *name, int forWriting)
{
PHYSFS_uint32 i = 0;
MIXinfo *info = NULL;
void *handle = NULL;
info = (MIXinfo *) allocator.Malloc(sizeof (MIXinfo));
BAIL_IF_MACRO(info == NULL, ERR_OUT_OF_MEMORY, 0);
memset(info, '\0', sizeof (MIXinfo));
info->filename = (char *) allocator.Malloc(strlen(name) + 1);
GOTO_IF_MACRO(!info->filename, ERR_OUT_OF_MEMORY, MIX_openArchive_failed);
/* store filename */
strcpy(info->filename, name);
/* open the file */
handle = __PHYSFS_platformOpenRead(name);
if (!handle)
goto MIX_openArchive_failed;
/* read the MIX header */
if ( (!readui16(handle, &info->header.num_files)) ||
(!readui32(handle, &info->header.filesize)) )
goto MIX_openArchive_failed;
info->delta = 6 + (info->header.num_files * 12);
/* allocate space for the entries and read the entries */
info->entry = allocator.Malloc(sizeof (MIXentry) * info->header.num_files);
GOTO_IF_MACRO(!info->entry, ERR_OUT_OF_MEMORY, MIX_openArchive_failed);
/* read the directory list */
for (i = 0; i < header.num_files; i++)
{
if ( (!readui32(handle, &info->entry[i].hash)) ||
(!readui32(handle, &info->entry[i].start_offset)) ||
(!readui32(handle, &info->entry[i].end_offset)) )
goto MIX_openArchive_failed;
} /* for */
__PHYSFS_platformClose(handle);
return(info);
MIX_openArchive_failed:
if (info != NULL)
{
if (info->filename != NULL)
allocator.Free(info->filename);
if (info->entry != NULL)
allocator.Free(info->entry);
allocator.Free(info);
} /* if */
if (handle != NULL)
__PHYSFS_platformClose(handle);
return(NULL);
} /* MIX_openArchive */
static void MIX_enumerateFiles(dvoid *opaque, const char *dname,
int omitSymLinks, PHYSFS_EnumFilesCallback cb,
const char *origdir, void *callbackdata)
{
/* no directories in MIX files. */
if (*dirname != '\0')
{
MIXinfo *info = (MIXinfo*) opaque;
MIXentry *entry = info->entry;
int i;
char buffer[32];
for (i = 0; i < info->header.num_files; i++, entry++)
{
sprintf(buffer, "%X", entry->hash);
cb(callbackdata, origdir, buffer);
} /* for */
} /* if */
} /* MIX_enumerateFiles */
static MIXentry *MIX_find_entry(MIXinfo *info, const char *name)
{
MIXentry *entry = info->entry;
PHYSFS_uint32 i, id;
/* create hash */
id = MIX_hash(name);
/* look for this hash */
for (i = 0; i < info->header.num_files; i++, entry++)
{
if (entry->hash == id)
return(entry);
} /* for */
/* nothing found... :( */
return(NULL);
} /* MIX_find_entry */
static int MIX_exists(dvoid *opaque, const char *name)
{
return(MIX_find_entry(((MIXinfo *) opaque), name) != NULL);
} /* MIX_exists */
static int MIX_isDirectory(dvoid *opaque, const char *name, int *fileExists)
{
*fileExists = MIX_exists(opaque, name);
return(0); /* never directories in a MIX */
} /* MIX_isDirectory */
static int MIX_isSymLink(dvoid *opaque, const char *name, int *fileExists)
{
*fileExists = MIX_exists(opaque, name);
return(0); /* never symlinks in a MIX. */
} /* MIX_isSymLink */
static PHYSFS_sint64 MIX_getLastModTime(dvoid *opaque,
const char *name,
int *fileExists)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0); /* !!! FIXME: return .MIX's modtime. */
} /* MIX_getLastModTime */
static fvoid *MIX_openRead(dvoid *opaque, const char *fnm, int *fileExists)
{
MIXinfo *info = ((MIXinfo*) opaque);
MIXfileinfo *finfo;
MIXentry *entry;
/* try to find this file */
entry = MIX_find_entry(info,fnm);
BAIL_IF_MACRO(entry == NULL, ERR_NO_SUCH_FILE, NULL);
/* allocate a MIX handle */
finfo = (MIXfileinfo *) allocator.Malloc(sizeof (MIXfileinfo));
BAIL_IF_MACRO(finfo == NULL, ERR_OUT_OF_MEMORY, NULL);
/* open the archive */
finfo->handle = __PHYSFS_platformOpenRead(info->filename);
if(!finfo->handle)
{
allocator.Free(finfo);
return(NULL);
} /* if */
/* setup structures */
finfo->cur_pos = 0;
finfo->info = info;
finfo->entry = entry;
finfo->size = entry->end_offset - entry->start_offset;
return(finfo);
} /* MIX_openRead */
static fvoid *MIX_openWrite(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* MIX_openWrite */
static fvoid *MIX_openAppend(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* MIX_openAppend */
static int MIX_remove(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* MIX_remove */
static int MIX_mkdir(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* MIX_mkdir */
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_MIX =
{
"MIX",
"Westwood archive (Tiberian Dawn / Red Alert)",
"Sebastian Steinhauer <steini@steini-welt.de>",
"http://icculus.org/physfs/",
};
const PHYSFS_Archiver __PHYSFS_Archiver_MIX =
{
&__PHYSFS_ArchiveInfo_MIX,
MIX_isArchive, /* isArchive() method */
MIX_openArchive, /* openArchive() method */
MIX_enumerateFiles, /* enumerateFiles() method */
MIX_exists, /* exists() method */
MIX_isDirectory, /* isDirectory() method */
MIX_isSymLink, /* isSymLink() method */
MIX_getLastModTime, /* getLastModTime() method */
MIX_openRead, /* openRead() method */
MIX_openWrite, /* openWrite() method */
MIX_openAppend, /* openAppend() method */
MIX_remove, /* remove() method */
MIX_mkdir, /* mkdir() method */
MIX_dirClose, /* dirClose() method */
MIX_read, /* read() method */
MIX_write, /* write() method */
MIX_eof, /* eof() method */
MIX_tell, /* tell() method */
MIX_seek, /* seek() method */
MIX_fileLength, /* fileLength() method */
MIX_fileClose /* fileClose() method */
};
#endif /* defined PHYSFS_SUPPORTS_MIX */
/* end of mix.c ... */
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