/*

* High-level PhysicsFS archiver for simple unpacked file formats.

*

* This is a framework that basic archivers build on top of. It's for simple

* formats that can just hand back a list of files and the offsets of their

* uncompressed data. There are an alarming number of formats like this.

*

* RULES: Archive entries must be uncompressed, must not have subdirs,

* must be case insensitive filenames < 32 chars. We can relax some of these

* rules as necessary.

*

* Please see the file LICENSE.txt in the source's root directory.

*

* This file written by Ryan C. Gordon.

*/

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

typedef struct

{

PHYSFS_Io *io;

PHYSFS_uint32 entryCount;

UNPKentry *entries;

} UNPKinfo;

typedef struct

{

PHYSFS_Io *io;

UNPKentry *entry;

PHYSFS_uint32 curPos;

} UNPKfileinfo;

void UNPK_dirClose(dvoid *opaque)

{

UNPKinfo *info = ((UNPKinfo *) opaque);

info->io->destroy(info->io);

allocator.Free(info->entries);

allocator.Free(info);

} /* UNPK_dirClose */

static PHYSFS_sint64 UNPK_read(PHYSFS_Io *io, void *buffer, PHYSFS_uint64 len)

{

UNPKfileinfo *finfo = (UNPKfileinfo *) io->opaque;

const UNPKentry *entry = finfo->entry;

const PHYSFS_uint64 bytesLeft = (PHYSFS_uint64)(entry->size-finfo->curPos);

PHYSFS_sint64 rc;

if (bytesLeft < len)

len = bytesLeft;

rc = finfo->io->read(finfo->io, buffer, len);

if (rc > 0)

finfo->curPos += (PHYSFS_uint32) rc;

return rc;

} /* UNPK_read */

static PHYSFS_sint64 UNPK_write(PHYSFS_Io *io, const void *b, PHYSFS_uint64 len)

{

BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, -1);

} /* UNPK_write */

static PHYSFS_sint64 UNPK_tell(PHYSFS_Io *io)

{

return ((UNPKfileinfo *) io->opaque)->curPos;

} /* UNPK_tell */

static int UNPK_seek(PHYSFS_Io *io, PHYSFS_uint64 offset)

{

UNPKfileinfo *finfo = (UNPKfileinfo *) io->opaque;

const UNPKentry *entry = finfo->entry;

int rc;

BAIL_IF_MACRO(offset >= entry->size, PHYSFS_ERR_PAST_EOF, 0);

rc = finfo->io->seek(finfo->io, entry->startPos + offset);

if (rc)

finfo->curPos = (PHYSFS_uint32) offset;

return rc;

} /* UNPK_seek */

static PHYSFS_sint64 UNPK_length(PHYSFS_Io *io)

{

const UNPKfileinfo *finfo = (UNPKfileinfo *) io->opaque;

return ((PHYSFS_sint64) finfo->entry->size);

} /* UNPK_length */

static PHYSFS_Io *UNPK_duplicate(PHYSFS_Io *_io)

{

UNPKfileinfo *origfinfo = (UNPKfileinfo *) _io->opaque;

PHYSFS_Io *io = NULL;

PHYSFS_Io *retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));

UNPKfileinfo *finfo = (UNPKfileinfo *) allocator.Malloc(sizeof (UNPKfileinfo));

GOTO_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, UNPK_duplicate_failed);

GOTO_IF_MACRO(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, UNPK_duplicate_failed);

io = origfinfo->io->duplicate(origfinfo->io);

if (!io) goto UNPK_duplicate_failed;

finfo->io = io;

finfo->entry = origfinfo->entry;

finfo->curPos = 0;

memcpy(retval, _io, sizeof (PHYSFS_Io));

retval->opaque = finfo;

return retval;

UNPK_duplicate_failed:

if (finfo != NULL) allocator.Free(finfo);

if (retval != NULL) allocator.Free(retval);

if (io != NULL) io->destroy(io);

return NULL;

} /* UNPK_duplicate */

static int UNPK_flush(PHYSFS_Io *io) { return 1; /* no write support. */ }

static void UNPK_destroy(PHYSFS_Io *io)

{

UNPKfileinfo *finfo = (UNPKfileinfo *) io->opaque;

finfo->io->destroy(finfo->io);

allocator.Free(finfo);

allocator.Free(io);

} /* UNPK_destroy */

static const PHYSFS_Io UNPK_Io =

{

UNPK_read,

UNPK_write,

UNPK_seek,

UNPK_tell,

UNPK_length,

UNPK_duplicate,

UNPK_flush,

UNPK_destroy,

NULL

};

static int entryCmp(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)

{

if (one != two)

{

const UNPKentry *a = (const UNPKentry *) _a;

return strcmp(a[one].name, a[two].name);

} /* if */

return 0;

} /* entryCmp */

static void entrySwap(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)

{

if (one != two)

{

UNPKentry tmp;

UNPKentry *first = &(((UNPKentry *) _a)[one]);

UNPKentry *second = &(((UNPKentry *) _a)[two]);

memcpy(&tmp, first, sizeof (UNPKentry));

memcpy(first, second, sizeof (UNPKentry));

memcpy(second, &tmp, sizeof (UNPKentry));

} /* if */

} /* entrySwap */

void UNPK_enumerateFiles(dvoid *opaque, const char *dname,

int omitSymLinks, PHYSFS_EnumFilesCallback cb,

const char *origdir, void *callbackdata)

{

/* no directories in UNPK files. */

if (*dname == '\0')

{

UNPKinfo *info = (UNPKinfo *) opaque;

UNPKentry *entry = info->entries;

PHYSFS_uint32 max = info->entryCount;

PHYSFS_uint32 i;

for (i = 0; i < max; i++, entry++)

cb(callbackdata, origdir, entry->name);

} /* if */

} /* UNPK_enumerateFiles */

static UNPKentry *findEntry(const UNPKinfo *info, const char *name)

{

UNPKentry *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 = __PHYSFS_utf8strcasecmp(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(PHYSFS_ERR_NO_SUCH_PATH, NULL);

} /* findEntry */

PHYSFS_Io *UNPK_openRead(dvoid *opaque, const char *fnm, int *fileExists)

{

PHYSFS_Io *retval = NULL;

UNPKinfo *info = (UNPKinfo *) opaque;

UNPKfileinfo *finfo = NULL;

UNPKentry *entry;

entry = findEntry(info, fnm);

*fileExists = (entry != NULL);

GOTO_IF_MACRO(!entry, ERRPASS, UNPK_openRead_failed);

retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));

GOTO_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, UNPK_openRead_failed);

finfo = (UNPKfileinfo *) allocator.Malloc(sizeof (UNPKfileinfo));

GOTO_IF_MACRO(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, UNPK_openRead_failed);

finfo->io = info->io->duplicate(info->io);

GOTO_IF_MACRO(!finfo->io, ERRPASS, UNPK_openRead_failed);

if (!finfo->io->seek(finfo->io, entry->startPos))

goto UNPK_openRead_failed;

finfo->curPos = 0;

finfo->entry = entry;

memcpy(retval, &UNPK_Io, sizeof (*retval));

retval->opaque = finfo;

return retval;

UNPK_openRead_failed:

if (finfo != NULL)

{

if (finfo->io != NULL)

finfo->io->destroy(finfo->io);

allocator.Free(finfo);

} /* if */

if (retval != NULL)

allocator.Free(retval);

return NULL;

} /* UNPK_openRead */

PHYSFS_Io *UNPK_openWrite(dvoid *opaque, const char *name)

{

BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL);

} /* UNPK_openWrite */

PHYSFS_Io *UNPK_openAppend(dvoid *opaque, const char *name)

{

BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, NULL);

} /* UNPK_openAppend */

int UNPK_remove(dvoid *opaque, const char *name)

{

BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, 0);

} /* UNPK_remove */

int UNPK_mkdir(dvoid *opaque, const char *name)

{

BAIL_MACRO(PHYSFS_ERR_UNSUPPORTED, 0);

} /* UNPK_mkdir */

int UNPK_stat(dvoid *opaque, const char *filename, int *exists,

PHYSFS_Stat *stat)

{

const UNPKinfo *info = (const UNPKinfo *) opaque;

const UNPKentry *entry = findEntry(info, filename);

*exists = (entry != 0);

if (!entry)

return 0;

stat->filesize = entry->size;

stat->filetype = PHYSFS_FILETYPE_REGULAR;

stat->modtime = -1;

stat->createtime = -1;

stat->accesstime = -1;

stat->readonly = 1;

return 1;

} /* UNPK_stat */

dvoid *UNPK_openArchive(PHYSFS_Io *io, UNPKentry *e, const PHYSFS_uint32 num)

{

UNPKinfo *info = (UNPKinfo *) allocator.Malloc(sizeof (UNPKinfo));

if (info == NULL)

{

allocator.Free(e);

BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL);

} /* if */

__PHYSFS_sort(e, num, entryCmp, entrySwap);

info->io = io;

info->entryCount = num;

info->entries = e;

return info;

} /* UNPK_openArchive */

/* end of archiver_unpacked.c ... */