/*

* 7zip support routines for PhysicsFS.

*

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

*

* This file was written by Ryan C. Gordon.

*/

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

#if PHYSFS_SUPPORTS_7Z

#include "physfs_lzmasdk.h"

typedef struct

{

ISeekInStream seekStream; /* lzma sdk i/o interface (lower level). */

PHYSFS_Io *io; /* physfs i/o interface for this archive. */

CLookToRead lookStream; /* lzma sdk i/o interface (higher level). */

} SZIPLookToRead;

/* One SZIPentry is kept for each file in an open 7zip archive. */

typedef struct

{

__PHYSFS_DirTreeEntry tree; /* manages directory tree */

PHYSFS_uint32 dbidx; /* index into lzma sdk database */

} SZIPentry;

/* One SZIPinfo is kept for each open 7zip archive. */

typedef struct

{

__PHYSFS_DirTree tree; /* manages directory tree. */

PHYSFS_Io *io; /* physfs i/o interface for this archive. */

CSzArEx db; /* lzma sdk archive database object. */

} SZIPinfo;

static PHYSFS_ErrorCode szipErrorCode(const SRes rc)

{

switch (rc)

{

case SZ_OK: return PHYSFS_ERR_OK;

case SZ_ERROR_DATA: return PHYSFS_ERR_CORRUPT;

case SZ_ERROR_MEM: return PHYSFS_ERR_OUT_OF_MEMORY;

case SZ_ERROR_CRC: return PHYSFS_ERR_CORRUPT;

case SZ_ERROR_UNSUPPORTED: return PHYSFS_ERR_UNSUPPORTED;

case SZ_ERROR_INPUT_EOF: return PHYSFS_ERR_CORRUPT;

case SZ_ERROR_OUTPUT_EOF: return PHYSFS_ERR_IO;

case SZ_ERROR_READ: return PHYSFS_ERR_IO;

case SZ_ERROR_WRITE: return PHYSFS_ERR_IO;

case SZ_ERROR_ARCHIVE: return PHYSFS_ERR_CORRUPT;

case SZ_ERROR_NO_ARCHIVE: return PHYSFS_ERR_UNSUPPORTED;

default: break;

} /* switch */

return PHYSFS_ERR_OTHER_ERROR;

} /* szipErrorCode */

/* LZMA SDK's ISzAlloc interface ... */

static void *SZIP_ISzAlloc_Alloc(void *p, size_t size)

{

return allocator.Malloc(size ? size : 1);

} /* SZIP_ISzAlloc_Alloc */

static void SZIP_ISzAlloc_Free(void *p, void *address)

{

if (address)

allocator.Free(address);

} /* SZIP_ISzAlloc_Free */

static ISzAlloc SZIP_SzAlloc = {

SZIP_ISzAlloc_Alloc, SZIP_ISzAlloc_Free

};

/* we implement ISeekInStream, and then wrap that in LZMA SDK's CLookToRead,

which implements the higher-level ILookInStream on top of that, handling

buffering and such for us. */

/* LZMA SDK's ISeekInStream interface ... */

static SRes SZIP_ISeekInStream_Read(void *p, void *buf, size_t *size)

{

SZIPLookToRead *stream = (SZIPLookToRead *) p;

PHYSFS_Io *io = stream->io;

const PHYSFS_uint64 len = (PHYSFS_uint64) *size;

const PHYSFS_sint64 rc = (len == 0) ? 0 : io->read(io, buf, len);

if (rc < 0)

{

*size = 0;

return SZ_ERROR_READ;

} /* if */

*size = (size_t) rc;

return SZ_OK;

} /* SZIP_ISeekInStream_Read */

static SRes SZIP_ISeekInStream_Seek(void *p, Int64 *pos, ESzSeek origin)

{

SZIPLookToRead *stream = (SZIPLookToRead *) p;

PHYSFS_Io *io = stream->io;

PHYSFS_sint64 base;

PHYSFS_uint64 newpos;

switch (origin)

{

case SZ_SEEK_SET:

base = 0;

break;

case SZ_SEEK_CUR:

base = io->tell(io);

break;

case SZ_SEEK_END:

base = io->length(io);

break;

default:

return SZ_ERROR_FAIL;

} /* switch */

if (base < 0)

return SZ_ERROR_FAIL;

else if ((*pos < 0) && (((Int64) base) < -*pos))

return SZ_ERROR_FAIL;

newpos = (PHYSFS_uint64) (((Int64) base) + *pos);

if (!io->seek(io, newpos))

return SZ_ERROR_FAIL;

*pos = (Int64) newpos;

return SZ_OK;

} /* SZIP_ISeekInStream_Seek */

static void szipInitStream(SZIPLookToRead *stream, PHYSFS_Io *io)

{

stream->seekStream.Read = SZIP_ISeekInStream_Read;

stream->seekStream.Seek = SZIP_ISeekInStream_Seek;

stream->io = io;

/* !!! FIXME: can we use lookahead? Is there value to it? */

LookToRead_Init(&stream->lookStream);

LookToRead_CreateVTable(&stream->lookStream, False);

stream->lookStream.realStream = &stream->seekStream;

} /* szipInitStream */

/* Do this in a separate function so we can smallAlloc without looping. */

static int szipLoadEntry(SZIPinfo *info, const PHYSFS_uint32 idx)

{

const size_t utf16len = SzArEx_GetFileNameUtf16(&info->db, idx, NULL);

const size_t utf16buflen = utf16len * 2;

PHYSFS_uint16 *utf16 = (PHYSFS_uint16 *) __PHYSFS_smallAlloc(utf16buflen);

const size_t utf8buflen = utf16len * 4;

char *utf8 = (char *) __PHYSFS_smallAlloc(utf8buflen);

int retval = 0;

if (utf16 && utf8)

{

const int isdir = SzArEx_IsDir(&info->db, idx) != 0;

SZIPentry *entry;

SzArEx_GetFileNameUtf16(&info->db, idx, (UInt16 *) utf16);

PHYSFS_utf8FromUtf16(utf16, utf8, utf8buflen);

entry = (SZIPentry*) __PHYSFS_DirTreeAdd(&info->tree, utf8, isdir);

retval = (entry != NULL);

if (retval)

entry->dbidx = idx;

} /* if */

__PHYSFS_smallFree(utf8);

__PHYSFS_smallFree(utf16);

return retval;

} /* szipLoadEntry */

static int szipLoadEntries(SZIPinfo *info)

{

int retval = 0;

if (__PHYSFS_DirTreeInit(&info->tree, sizeof (SZIPentry)))

{

const PHYSFS_uint32 count = info->db.NumFiles;

PHYSFS_uint32 i;

for (i = 0; i < count; i++)

BAIL_IF_ERRPASS(!szipLoadEntry(info, i), 0);

retval = 1;

} /* if */

return retval;

} /* szipLoadEntries */

static void SZIP_closeArchive(void *opaque)

{

SZIPinfo *info = (SZIPinfo *) opaque;

if (info)

{

SzArEx_Free(&info->db, &SZIP_SzAlloc);

__PHYSFS_DirTreeDeinit(&info->tree);

allocator.Free(info);

} /* if */

} /* SZIP_closeArchive */

static void *SZIP_openArchive(PHYSFS_Io *io, const char *name,

int forWriting, int *claimed)

{

static const PHYSFS_uint8 wantedsig[] = { '7','z',0xBC,0xAF,0x27,0x1C };

SZIPLookToRead stream;

ISzAlloc *alloc = &SZIP_SzAlloc;

SZIPinfo *info = NULL;

SRes rc;

PHYSFS_uint8 sig[6];

PHYSFS_sint64 pos;

BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);

pos = io->tell(io);

BAIL_IF_ERRPASS(pos == -1, NULL);

BAIL_IF_ERRPASS(io->read(io, sig, 6) != 6, NULL);

*claimed = (memcmp(sig, wantedsig, 6) == 0);

BAIL_IF_ERRPASS(!io->seek(io, pos), NULL);

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

BAIL_IF(!info, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

memset(info, '\0', sizeof (*info));

SzArEx_Init(&info->db);

info->io = io;

szipInitStream(&stream, io);

rc = SzArEx_Open(&info->db, &stream.lookStream.s, alloc, alloc);

GOTO_IF(rc != SZ_OK, szipErrorCode(rc), failed);

GOTO_IF_ERRPASS(!szipLoadEntries(info), failed);

return info;

failed:

info->io = NULL; /* don't let cleanup destroy the PHYSFS_Io. */

SZIP_closeArchive(info);

return NULL;

} /* SZIP_openArchive */

static PHYSFS_Io *SZIP_openRead(void *opaque, const char *path)

{

/* !!! FIXME: the current lzma sdk C API only allows you to decompress

!!! FIXME: the entire file at once, which isn't ideal. Fix this in the

!!! FIXME: SDK and then convert this all to a streaming interface. */

SZIPinfo *info = (SZIPinfo *) opaque;

SZIPentry *entry = (SZIPentry *) __PHYSFS_DirTreeFind(&info->tree, path);

ISzAlloc *alloc = &SZIP_SzAlloc;

SZIPLookToRead stream;

PHYSFS_Io *retval = NULL;

PHYSFS_Io *io = NULL;

UInt32 blockIndex = 0xFFFFFFFF;

Byte *outBuffer = NULL;

size_t outBufferSize = 0;

size_t offset = 0;

size_t outSizeProcessed = 0;

void *buf = NULL;

SRes rc;

BAIL_IF_ERRPASS(!entry, NULL);

BAIL_IF(entry->tree.isdir, PHYSFS_ERR_NOT_A_FILE, NULL);

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

GOTO_IF_ERRPASS(!io, SZIP_openRead_failed);

szipInitStream(&stream, io);

rc = SzArEx_Extract(&info->db, &stream.lookStream.s, entry->dbidx,

&blockIndex, &outBuffer, &outBufferSize, &offset,

&outSizeProcessed, alloc, alloc);

GOTO_IF(rc != SZ_OK, szipErrorCode(rc), SZIP_openRead_failed);

io->destroy(io);

io = NULL;

buf = allocator.Malloc(outSizeProcessed);

GOTO_IF(rc != SZ_OK, PHYSFS_ERR_OUT_OF_MEMORY, SZIP_openRead_failed);

memcpy(buf, outBuffer + offset, outSizeProcessed);

alloc->Free(alloc, outBuffer);

outBuffer = NULL;

retval = __PHYSFS_createMemoryIo(buf, outSizeProcessed, allocator.Free);

GOTO_IF_ERRPASS(!retval, SZIP_openRead_failed);

return retval;

SZIP_openRead_failed:

if (io != NULL)

io->destroy(io);

if (buf)

allocator.Free(buf);

if (outBuffer)

alloc->Free(alloc, outBuffer);

return NULL;

} /* SZIP_openRead */

static PHYSFS_Io *SZIP_openWrite(void *opaque, const char *filename)

{

BAIL(PHYSFS_ERR_READ_ONLY, NULL);

} /* SZIP_openWrite */

static PHYSFS_Io *SZIP_openAppend(void *opaque, const char *filename)

{

BAIL(PHYSFS_ERR_READ_ONLY, NULL);

} /* SZIP_openAppend */

static int SZIP_remove(void *opaque, const char *name)

{

BAIL(PHYSFS_ERR_READ_ONLY, 0);

} /* SZIP_remove */

static int SZIP_mkdir(void *opaque, const char *name)

{

BAIL(PHYSFS_ERR_READ_ONLY, 0);

} /* SZIP_mkdir */

static inline PHYSFS_uint64 lzmasdkTimeToPhysfsTime(const CNtfsFileTime *t)

{

const PHYSFS_uint64 winEpochToUnixEpoch = __PHYSFS_UI64(0x019DB1DED53E8000);

const PHYSFS_uint64 nanosecToMillisec = __PHYSFS_UI64(10000000);

const PHYSFS_uint64 quad = (((PHYSFS_uint64) t->High) << 32) | t->Low;

return (quad - winEpochToUnixEpoch) / nanosecToMillisec;

} /* lzmasdkTimeToPhysfsTime */

static int SZIP_stat(void *opaque, const char *path, PHYSFS_Stat *stat)

{

SZIPinfo *info = (SZIPinfo *) opaque;

SZIPentry *entry;

PHYSFS_uint32 idx;

entry = (SZIPentry *) __PHYSFS_DirTreeFind(&info->tree, path);

BAIL_IF_ERRPASS(!entry, 0);

idx = entry->dbidx;

if (entry->tree.isdir)

{

stat->filesize = -1;

stat->filetype = PHYSFS_FILETYPE_DIRECTORY;

} /* if */

else

{

stat->filesize = (PHYSFS_sint64) SzArEx_GetFileSize(&info->db, idx);

stat->filetype = PHYSFS_FILETYPE_REGULAR;

} /* else */

if (info->db.MTime.Vals != NULL)

stat->modtime = lzmasdkTimeToPhysfsTime(&info->db.MTime.Vals[idx]);

else if (info->db.CTime.Vals != NULL)

stat->modtime = lzmasdkTimeToPhysfsTime(&info->db.CTime.Vals[idx]);

else

stat->modtime = -1;

if (info->db.CTime.Vals != NULL)

stat->createtime = lzmasdkTimeToPhysfsTime(&info->db.CTime.Vals[idx]);

else if (info->db.MTime.Vals != NULL)

stat->createtime = lzmasdkTimeToPhysfsTime(&info->db.MTime.Vals[idx]);

else

stat->createtime = -1;

stat->accesstime = -1;

stat->readonly = 1;

return 1;

} /* SZIP_stat */

void SZIP_global_init(void)

{

/* this just needs to calculate some things, so it only ever

has to run once, even after a deinit. */

static int generatedTable = 0;

if (!generatedTable)

{

generatedTable = 1;

CrcGenerateTable();

} /* if */

} /* SZIP_global_init */

const PHYSFS_Archiver __PHYSFS_Archiver_7Z =

{

CURRENT_PHYSFS_ARCHIVER_API_VERSION,

{

"7Z",

"7zip archives",

"Ryan C. Gordon <icculus@icculus.org>",

"https://icculus.org/physfs/",

0, /* supportsSymlinks */

},

SZIP_openArchive,

__PHYSFS_DirTreeEnumerate,

SZIP_openRead,

SZIP_openWrite,

SZIP_openAppend,

SZIP_remove,

SZIP_mkdir,

SZIP_stat,

SZIP_closeArchive

};

#endif /* defined PHYSFS_SUPPORTS_7Z */

/* end of physfs_archiver_7z.c ... */