breakhack/physfs-3.0.1/src/physfs_archiver_7z.c

429 lines
12 KiB
C

/*
* 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 ... */