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townengine/third-party/physfs/src/physfs_archiver_zip.c

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awesome!!!
2024-07-08 00:44:20 +00:00
/*
* ZIP support routines for PhysicsFS.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon, with some peeking at "unzip.c"
* by Gilles Vollant.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if PHYSFS_SUPPORTS_ZIP
#include <errno.h>
#include <time.h>
#if (PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN)
#define MINIZ_LITTLE_ENDIAN 1
#else
#define MINIZ_LITTLE_ENDIAN 0
#endif
#include "physfs_miniz.h"
/*
* A buffer of ZIP_READBUFSIZE is allocated for each compressed file opened,
* and is freed when you close the file; compressed data is read into
* this buffer, and then is decompressed into the buffer passed to
* PHYSFS_read().
*
* Uncompressed entries in a zipfile do not allocate this buffer; they just
* read data directly into the buffer passed to PHYSFS_read().
*
* Depending on your speed and memory requirements, you should tweak this
* value.
*/
#define ZIP_READBUFSIZE (16 * 1024)
/*
* Entries are "unresolved" until they are first opened. At that time,
* local file headers parsed/validated, data offsets will be updated to look
* at the actual file data instead of the header, and symlinks will be
* followed and optimized. This means that we don't seek and read around the
* archive until forced to do so, and after the first time, we had to do
* less reading and parsing, which is very CD-ROM friendly.
*/
typedef enum
{
ZIP_UNRESOLVED_FILE,
ZIP_UNRESOLVED_SYMLINK,
ZIP_RESOLVING,
ZIP_RESOLVED,
ZIP_DIRECTORY,
ZIP_BROKEN_FILE,
ZIP_BROKEN_SYMLINK
} ZipResolveType;
/*
* One ZIPentry is kept for each file in an open ZIP archive.
*/
typedef struct _ZIPentry
{
__PHYSFS_DirTreeEntry tree; /* manages directory tree */
struct _ZIPentry *symlink; /* NULL or file we symlink to */
ZipResolveType resolved; /* Have we resolved file/symlink? */
PHYSFS_uint64 offset; /* offset of data in archive */
PHYSFS_uint16 version; /* version made by */
PHYSFS_uint16 version_needed; /* version needed to extract */
PHYSFS_uint16 general_bits; /* general purpose bits */
PHYSFS_uint16 compression_method; /* compression method */
PHYSFS_uint32 crc; /* crc-32 */
PHYSFS_uint64 compressed_size; /* compressed size */
PHYSFS_uint64 uncompressed_size; /* uncompressed size */
PHYSFS_sint64 last_mod_time; /* last file mod time */
PHYSFS_uint32 dos_mod_time; /* original MS-DOS style mod time */
} ZIPentry;
/*
* One ZIPinfo is kept for each open ZIP archive.
*/
typedef struct
{
__PHYSFS_DirTree tree; /* manages directory tree. */
PHYSFS_Io *io; /* the i/o interface for this archive. */
int zip64; /* non-zero if this is a Zip64 archive. */
int has_crypto; /* non-zero if any entry uses encryption. */
} ZIPinfo;
/*
* One ZIPfileinfo is kept for each open file in a ZIP archive.
*/
typedef struct
{
ZIPentry *entry; /* Info on file. */
PHYSFS_Io *io; /* physical file handle. */
PHYSFS_uint32 compressed_position; /* offset in compressed data. */
PHYSFS_uint32 uncompressed_position; /* tell() position. */
PHYSFS_uint8 *buffer; /* decompression buffer. */
PHYSFS_uint32 crypto_keys[3]; /* for "traditional" crypto. */
PHYSFS_uint32 initial_crypto_keys[3]; /* for "traditional" crypto. */
z_stream stream; /* zlib stream state. */
} ZIPfileinfo;
/* Magic numbers... */
#define ZIP_LOCAL_FILE_SIG 0x04034b50
#define ZIP_CENTRAL_DIR_SIG 0x02014b50
#define ZIP_END_OF_CENTRAL_DIR_SIG 0x06054b50
#define ZIP64_END_OF_CENTRAL_DIR_SIG 0x06064b50
#define ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR_SIG 0x07064b50
#define ZIP64_EXTENDED_INFO_EXTRA_FIELD_SIG 0x0001
/* compression methods... */
#define COMPMETH_NONE 0
/* ...and others... */
#define UNIX_FILETYPE_MASK 0170000
#define UNIX_FILETYPE_SYMLINK 0120000
#define ZIP_GENERAL_BITS_TRADITIONAL_CRYPTO (1 << 0)
#define ZIP_GENERAL_BITS_IGNORE_LOCAL_HEADER (1 << 3)
/* support for "traditional" PKWARE encryption. */
static int zip_entry_is_tradional_crypto(const ZIPentry *entry)
{
return (entry->general_bits & ZIP_GENERAL_BITS_TRADITIONAL_CRYPTO) != 0;
} /* zip_entry_is_traditional_crypto */
static int zip_entry_ignore_local_header(const ZIPentry *entry)
{
return (entry->general_bits & ZIP_GENERAL_BITS_IGNORE_LOCAL_HEADER) != 0;
} /* zip_entry_is_traditional_crypto */
static PHYSFS_uint32 zip_crypto_crc32(const PHYSFS_uint32 crc, const PHYSFS_uint8 val)
{
int i;
PHYSFS_uint32 xorval = (crc ^ ((PHYSFS_uint32) val)) & 0xFF;
for (i = 0; i < 8; i++)
xorval = ((xorval & 1) ? (0xEDB88320 ^ (xorval >> 1)) : (xorval >> 1));
return xorval ^ (crc >> 8);
} /* zip_crc32 */
static void zip_update_crypto_keys(PHYSFS_uint32 *keys, const PHYSFS_uint8 val)
{
keys[0] = zip_crypto_crc32(keys[0], val);
keys[1] = keys[1] + (keys[0] & 0x000000FF);
keys[1] = (keys[1] * 134775813) + 1;
keys[2] = zip_crypto_crc32(keys[2], (PHYSFS_uint8) ((keys[1] >> 24) & 0xFF));
} /* zip_update_crypto_keys */
static PHYSFS_uint8 zip_decrypt_byte(const PHYSFS_uint32 *keys)
{
const PHYSFS_uint16 tmp = keys[2] | 2;
return (PHYSFS_uint8) ((tmp * (tmp ^ 1)) >> 8);
} /* zip_decrypt_byte */
static PHYSFS_sint64 zip_read_decrypt(ZIPfileinfo *finfo, void *buf, PHYSFS_uint64 len)
{
PHYSFS_Io *io = finfo->io;
const PHYSFS_sint64 br = io->read(io, buf, len);
/* Decompression the new data if necessary. */
if (zip_entry_is_tradional_crypto(finfo->entry) && (br > 0))
{
PHYSFS_uint32 *keys = finfo->crypto_keys;
PHYSFS_uint8 *ptr = (PHYSFS_uint8 *) buf;
PHYSFS_sint64 i;
for (i = 0; i < br; i++, ptr++)
{
const PHYSFS_uint8 ch = *ptr ^ zip_decrypt_byte(keys);
zip_update_crypto_keys(keys, ch);
*ptr = ch;
} /* for */
} /* if */
return br;
} /* zip_read_decrypt */
static int zip_prep_crypto_keys(ZIPfileinfo *finfo, const PHYSFS_uint8 *crypto_header, const PHYSFS_uint8 *password)
{
/* It doesn't appear to be documented in PKWare's APPNOTE.TXT, but you
need to use a different byte in the header to verify the password
if general purpose bit 3 is set. Discovered this from Info-Zip.
That's what the (verifier) value is doing, below. */
PHYSFS_uint32 *keys = finfo->crypto_keys;
const ZIPentry *entry = finfo->entry;
const int usedate = zip_entry_ignore_local_header(entry);
const PHYSFS_uint8 verifier = (PHYSFS_uint8) ((usedate ? (entry->dos_mod_time >> 8) : (entry->crc >> 24)) & 0xFF);
PHYSFS_uint8 finalbyte = 0;
int i = 0;
/* initialize vector with defaults, then password, then header. */
keys[0] = 305419896;
keys[1] = 591751049;
keys[2] = 878082192;
while (*password)
zip_update_crypto_keys(keys, *(password++));
for (i = 0; i < 12; i++)
{
const PHYSFS_uint8 c = crypto_header[i] ^ zip_decrypt_byte(keys);
zip_update_crypto_keys(keys, c);
finalbyte = c;
} /* for */
/* you have a 1/256 chance of passing this test incorrectly. :/ */
if (finalbyte != verifier)
BAIL(PHYSFS_ERR_BAD_PASSWORD, 0);
/* save the initial vector for seeking purposes. Not secure!! */
memcpy(finfo->initial_crypto_keys, finfo->crypto_keys, 12);
return 1;
} /* zip_prep_crypto_keys */
/*
* Bridge physfs allocation functions to zlib's format...
*/
static voidpf zlibPhysfsAlloc(voidpf opaque, uInt items, uInt size)
{
return ((PHYSFS_Allocator *) opaque)->Malloc(items * size);
} /* zlibPhysfsAlloc */
/*
* Bridge physfs allocation functions to zlib's format...
*/
static void zlibPhysfsFree(voidpf opaque, voidpf address)
{
((PHYSFS_Allocator *) opaque)->Free(address);
} /* zlibPhysfsFree */
/*
* Construct a new z_stream to a sane state.
*/
static void initializeZStream(z_stream *pstr)
{
memset(pstr, '\0', sizeof (z_stream));
pstr->zalloc = zlibPhysfsAlloc;
pstr->zfree = zlibPhysfsFree;
pstr->opaque = &allocator;
} /* initializeZStream */
static PHYSFS_ErrorCode zlib_error_code(int rc)
{
switch (rc)
{
case Z_OK: return PHYSFS_ERR_OK; /* not an error. */
case Z_STREAM_END: return PHYSFS_ERR_OK; /* not an error. */
case Z_ERRNO: return PHYSFS_ERR_IO;
case Z_MEM_ERROR: return PHYSFS_ERR_OUT_OF_MEMORY;
default: return PHYSFS_ERR_CORRUPT;
} /* switch */
} /* zlib_error_string */
/*
* Wrap all zlib calls in this, so the physfs error state is set appropriately.
*/
static int zlib_err(const int rc)
{
PHYSFS_setErrorCode(zlib_error_code(rc));
return rc;
} /* zlib_err */
/*
* Read an unsigned 64-bit int and swap to native byte order.
*/
static int readui64(PHYSFS_Io *io, PHYSFS_uint64 *val)
{
PHYSFS_uint64 v;
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
*val = PHYSFS_swapULE64(v);
return 1;
} /* readui64 */
/*
* Read an unsigned 32-bit int and swap to native byte order.
*/
static int readui32(PHYSFS_Io *io, PHYSFS_uint32 *val)
{
PHYSFS_uint32 v;
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
*val = PHYSFS_swapULE32(v);
return 1;
} /* readui32 */
/*
* Read an unsigned 16-bit int and swap to native byte order.
*/
static int readui16(PHYSFS_Io *io, PHYSFS_uint16 *val)
{
PHYSFS_uint16 v;
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
*val = PHYSFS_swapULE16(v);
return 1;
} /* readui16 */
static PHYSFS_sint64 ZIP_read(PHYSFS_Io *_io, void *buf, PHYSFS_uint64 len)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque;
ZIPentry *entry = finfo->entry;
PHYSFS_sint64 retval = 0;
PHYSFS_sint64 maxread = (PHYSFS_sint64) len;
PHYSFS_sint64 avail = entry->uncompressed_size -
finfo->uncompressed_position;
if (avail < maxread)
maxread = avail;
BAIL_IF_ERRPASS(maxread == 0, 0); /* quick rejection. */
if (entry->compression_method == COMPMETH_NONE)
retval = zip_read_decrypt(finfo, buf, maxread);
else
{
finfo->stream.next_out = buf;
finfo->stream.avail_out = (uInt) maxread;
while (retval < maxread)
{
const PHYSFS_uint32 before = (PHYSFS_uint32) finfo->stream.total_out;
int rc;
if (finfo->stream.avail_in == 0)
{
PHYSFS_sint64 br;
br = entry->compressed_size - finfo->compressed_position;
if (br > 0)
{
if (br > ZIP_READBUFSIZE)
br = ZIP_READBUFSIZE;
br = zip_read_decrypt(finfo, finfo->buffer, (PHYSFS_uint64) br);
if (br <= 0)
break;
finfo->compressed_position += (PHYSFS_uint32) br;
finfo->stream.next_in = finfo->buffer;
finfo->stream.avail_in = (unsigned int) br;
} /* if */
} /* if */
rc = zlib_err(inflate(&finfo->stream, Z_SYNC_FLUSH));
retval += (finfo->stream.total_out - before);
if (rc != Z_OK)
break;
} /* while */
} /* else */
if (retval > 0)
finfo->uncompressed_position += (PHYSFS_uint32) retval;
return retval;
} /* ZIP_read */
static PHYSFS_sint64 ZIP_write(PHYSFS_Io *io, const void *b, PHYSFS_uint64 len)
{
BAIL(PHYSFS_ERR_READ_ONLY, -1);
} /* ZIP_write */
static PHYSFS_sint64 ZIP_tell(PHYSFS_Io *io)
{
return ((ZIPfileinfo *) io->opaque)->uncompressed_position;
} /* ZIP_tell */
static int ZIP_seek(PHYSFS_Io *_io, PHYSFS_uint64 offset)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque;
ZIPentry *entry = finfo->entry;
PHYSFS_Io *io = finfo->io;
const int encrypted = zip_entry_is_tradional_crypto(entry);
BAIL_IF(offset > entry->uncompressed_size, PHYSFS_ERR_PAST_EOF, 0);
if (!encrypted && (entry->compression_method == COMPMETH_NONE))
{
PHYSFS_sint64 newpos = offset + entry->offset;
BAIL_IF_ERRPASS(!io->seek(io, newpos), 0);
finfo->uncompressed_position = (PHYSFS_uint32) offset;
} /* if */
else
{
/*
* If seeking backwards, we need to redecode the file
* from the start and throw away the compressed bits until we hit
* the offset we need. If seeking forward, we still need to
* decode, but we don't rewind first.
*/
if (offset < finfo->uncompressed_position)
{
/* we do a copy so state is sane if inflateInit2() fails. */
z_stream str;
initializeZStream(&str);
if (zlib_err(inflateInit2(&str, -MAX_WBITS)) != Z_OK)
return 0;
if (!io->seek(io, entry->offset + (encrypted ? 12 : 0)))
return 0;
inflateEnd(&finfo->stream);
memcpy(&finfo->stream, &str, sizeof (z_stream));
finfo->uncompressed_position = finfo->compressed_position = 0;
if (encrypted)
memcpy(finfo->crypto_keys, finfo->initial_crypto_keys, 12);
} /* if */
while (finfo->uncompressed_position != offset)
{
PHYSFS_uint8 buf[512];
PHYSFS_uint32 maxread;
maxread = (PHYSFS_uint32) (offset - finfo->uncompressed_position);
if (maxread > sizeof (buf))
maxread = sizeof (buf);
if (ZIP_read(_io, buf, maxread) != maxread)
return 0;
} /* while */
} /* else */
return 1;
} /* ZIP_seek */
static PHYSFS_sint64 ZIP_length(PHYSFS_Io *io)
{
const ZIPfileinfo *finfo = (ZIPfileinfo *) io->opaque;
return (PHYSFS_sint64) finfo->entry->uncompressed_size;
} /* ZIP_length */
static PHYSFS_Io *zip_get_io(PHYSFS_Io *io, ZIPinfo *inf, ZIPentry *entry);
static PHYSFS_Io *ZIP_duplicate(PHYSFS_Io *io)
{
ZIPfileinfo *origfinfo = (ZIPfileinfo *) io->opaque;
PHYSFS_Io *retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
ZIPfileinfo *finfo = (ZIPfileinfo *) allocator.Malloc(sizeof (ZIPfileinfo));
GOTO_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, failed);
GOTO_IF(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, failed);
memset(finfo, '\0', sizeof (*finfo));
finfo->entry = origfinfo->entry;
finfo->io = zip_get_io(origfinfo->io, NULL, finfo->entry);
GOTO_IF_ERRPASS(!finfo->io, failed);
initializeZStream(&finfo->stream);
if (finfo->entry->compression_method != COMPMETH_NONE)
{
finfo->buffer = (PHYSFS_uint8 *) allocator.Malloc(ZIP_READBUFSIZE);
GOTO_IF(!finfo->buffer, PHYSFS_ERR_OUT_OF_MEMORY, failed);
if (zlib_err(inflateInit2(&finfo->stream, -MAX_WBITS)) != Z_OK)
goto failed;
} /* if */
memcpy(retval, io, sizeof (PHYSFS_Io));
retval->opaque = finfo;
return retval;
failed:
if (finfo != NULL)
{
if (finfo->io != NULL)
finfo->io->destroy(finfo->io);
if (finfo->buffer != NULL)
{
allocator.Free(finfo->buffer);
inflateEnd(&finfo->stream);
} /* if */
allocator.Free(finfo);
} /* if */
if (retval != NULL)
allocator.Free(retval);
return NULL;
} /* ZIP_duplicate */
static int ZIP_flush(PHYSFS_Io *io) { return 1; /* no write support. */ }
static void ZIP_destroy(PHYSFS_Io *io)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) io->opaque;
finfo->io->destroy(finfo->io);
if (finfo->entry->compression_method != COMPMETH_NONE)
inflateEnd(&finfo->stream);
if (finfo->buffer != NULL)
allocator.Free(finfo->buffer);
allocator.Free(finfo);
allocator.Free(io);
} /* ZIP_destroy */
static const PHYSFS_Io ZIP_Io =
{
CURRENT_PHYSFS_IO_API_VERSION, NULL,
ZIP_read,
ZIP_write,
ZIP_seek,
ZIP_tell,
ZIP_length,
ZIP_duplicate,
ZIP_flush,
ZIP_destroy
};
static PHYSFS_sint64 zip_find_end_of_central_dir(PHYSFS_Io *io, PHYSFS_sint64 *len)
{
PHYSFS_uint8 buf[256];
PHYSFS_uint8 extra[4] = { 0, 0, 0, 0 };
PHYSFS_sint32 i = 0;
PHYSFS_sint64 filelen;
PHYSFS_sint64 filepos;
PHYSFS_sint32 maxread;
PHYSFS_sint32 totalread = 0;
int found = 0;
filelen = io->length(io);
BAIL_IF_ERRPASS(filelen == -1, -1);
/*
* Jump to the end of the file and start reading backwards.
* The last thing in the file is the zipfile comment, which is variable
* length, and the field that specifies its size is before it in the
* file (argh!)...this means that we need to scan backwards until we
* hit the end-of-central-dir signature. We can then sanity check that
* the comment was as big as it should be to make sure we're in the
* right place. The comment length field is 16 bits, so we can stop
* searching for that signature after a little more than 64k at most,
* and call it a corrupted zipfile.
*/
if (sizeof (buf) < filelen)
{
filepos = filelen - sizeof (buf);
maxread = sizeof (buf);
} /* if */
else
{
filepos = 0;
maxread = (PHYSFS_uint32) filelen;
} /* else */
while ((totalread < filelen) && (totalread < 65557))
{
BAIL_IF_ERRPASS(!io->seek(io, filepos), -1);
/* make sure we catch a signature between buffers. */
if (totalread != 0)
{
if (!__PHYSFS_readAll(io, buf, maxread - 4))
return -1;
memcpy(&buf[maxread - 4], extra, sizeof (extra));
totalread += maxread - 4;
} /* if */
else
{
if (!__PHYSFS_readAll(io, buf, maxread))
return -1;
totalread += maxread;
} /* else */
memcpy(extra, buf, sizeof (extra));
for (i = maxread - 4; i > 0; i--)
{
if ((buf[i + 0] == 0x50) &&
(buf[i + 1] == 0x4B) &&
(buf[i + 2] == 0x05) &&
(buf[i + 3] == 0x06) )
{
found = 1; /* that's the signature! */
break;
} /* if */
} /* for */
if (found)
break;
filepos -= (maxread - 4);
if (filepos < 0)
filepos = 0;
} /* while */
BAIL_IF(!found, PHYSFS_ERR_UNSUPPORTED, -1);
if (len != NULL)
*len = filelen;
return (filepos + i);
} /* zip_find_end_of_central_dir */
static int isZip(PHYSFS_Io *io)
{
PHYSFS_uint32 sig = 0;
int retval = 0;
/*
* The first thing in a zip file might be the signature of the
* first local file record, so it makes for a quick determination.
*/
if (readui32(io, &sig))
{
retval = (sig == ZIP_LOCAL_FILE_SIG);
if (!retval)
{
/*
* No sig...might be a ZIP with data at the start
* (a self-extracting executable, etc), so we'll have to do
* it the hard way...
*/
retval = (zip_find_end_of_central_dir(io, NULL) != -1);
} /* if */
} /* if */
return retval;
} /* isZip */
/* Convert paths from old, buggy DOS zippers... */
static void zip_convert_dos_path(const PHYSFS_uint16 entryversion, char *path)
{
const PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((entryversion >> 8) & 0xFF);
if (hosttype == 0) /* FS_FAT_ */
{
while (*path)
{
if (*path == '\\')
*path = '/';
path++;
} /* while */
} /* if */
} /* zip_convert_dos_path */
static void zip_expand_symlink_path(char *path)
{
char *ptr = path;
char *prevptr = path;
while (1)
{
ptr = strchr(ptr, '/');
if (ptr == NULL)
break;
if (*(ptr + 1) == '.')
{
if (*(ptr + 2) == '/')
{
/* current dir in middle of string: ditch it. */
memmove(ptr, ptr + 2, strlen(ptr + 2) + 1);
} /* else if */
else if (*(ptr + 2) == '\0')
{
/* current dir at end of string: ditch it. */
*ptr = '\0';
} /* else if */
else if (*(ptr + 2) == '.')
{
if (*(ptr + 3) == '/')
{
/* parent dir in middle: move back one, if possible. */
memmove(prevptr, ptr + 4, strlen(ptr + 4) + 1);
ptr = prevptr;
while (prevptr != path)
{
prevptr--;
if (*prevptr == '/')
{
prevptr++;
break;
} /* if */
} /* while */
} /* if */
if (*(ptr + 3) == '\0')
{
/* parent dir at end: move back one, if possible. */
*prevptr = '\0';
} /* if */
} /* if */
} /* if */
else
{
prevptr = ptr;
ptr++;
} /* else */
} /* while */
} /* zip_expand_symlink_path */
static inline ZIPentry *zip_find_entry(ZIPinfo *info, const char *path)
{
return (ZIPentry *) __PHYSFS_DirTreeFind(&info->tree, path);
} /* zip_find_entry */
/* (forward reference: zip_follow_symlink and zip_resolve call each other.) */
static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry);
/*
* Look for the entry named by (path). If it exists, resolve it, and return
* a pointer to that entry. If it's another symlink, keep resolving until you
* hit a real file and then return a pointer to the final non-symlink entry.
* If there's a problem, return NULL.
*/
static ZIPentry *zip_follow_symlink(PHYSFS_Io *io, ZIPinfo *info, char *path)
{
ZIPentry *entry;
zip_expand_symlink_path(path);
entry = zip_find_entry(info, path);
if (entry != NULL)
{
if (!zip_resolve(io, info, entry)) /* recursive! */
entry = NULL;
else
{
if (entry->symlink != NULL)
entry = entry->symlink;
} /* else */
} /* if */
return entry;
} /* zip_follow_symlink */
static int zip_resolve_symlink(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry)
{
const size_t size = (size_t) entry->uncompressed_size;
char *path = NULL;
int rc = 0;
/*
* We've already parsed the local file header of the symlink at this
* point. Now we need to read the actual link from the file data and
* follow it.
*/
BAIL_IF_ERRPASS(!io->seek(io, entry->offset), 0);
path = (char *) __PHYSFS_smallAlloc(size + 1);
BAIL_IF(!path, PHYSFS_ERR_OUT_OF_MEMORY, 0);
if (entry->compression_method == COMPMETH_NONE)
rc = __PHYSFS_readAll(io, path, size);
else /* symlink target path is compressed... */
{
z_stream stream;
const size_t complen = (size_t) entry->compressed_size;
PHYSFS_uint8 *compressed = (PHYSFS_uint8*) __PHYSFS_smallAlloc(complen);
if (compressed != NULL)
{
if (__PHYSFS_readAll(io, compressed, complen))
{
initializeZStream(&stream);
stream.next_in = compressed;
stream.avail_in = (unsigned int) complen;
stream.next_out = (unsigned char *) path;
stream.avail_out = (unsigned int) size;
if (zlib_err(inflateInit2(&stream, -MAX_WBITS)) == Z_OK)
{
rc = zlib_err(inflate(&stream, Z_FINISH));
inflateEnd(&stream);
/* both are acceptable outcomes... */
rc = ((rc == Z_OK) || (rc == Z_STREAM_END));
} /* if */
} /* if */
__PHYSFS_smallFree(compressed);
} /* if */
} /* else */
if (rc)
{
path[entry->uncompressed_size] = '\0'; /* null-terminate it. */
zip_convert_dos_path(entry->version, path);
entry->symlink = zip_follow_symlink(io, info, path);
} /* else */
__PHYSFS_smallFree(path);
return (entry->symlink != NULL);
} /* zip_resolve_symlink */
/*
* Parse the local file header of an entry, and update entry->offset.
*/
static int zip_parse_local(PHYSFS_Io *io, ZIPentry *entry)
{
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_uint16 fnamelen;
PHYSFS_uint16 extralen;
/*
* crc and (un)compressed_size are always zero if this is a "JAR"
* archive created with Sun's Java tools, apparently. We only
* consider this archive corrupted if those entries don't match and
* aren't zero. That seems to work well.
* We also ignore a mismatch if the value is 0xFFFFFFFF here, since it's
* possible that's a Zip64 thing.
*/
/* !!! FIXME: apparently these are zero if general purpose bit 3 is set,
!!! FIXME: which is probably true for Jar files, fwiw, but we don't
!!! FIXME: care about these values anyhow. */
BAIL_IF_ERRPASS(!io->seek(io, entry->offset), 0);
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 != ZIP_LOCAL_FILE_SIG, PHYSFS_ERR_CORRUPT, 0);
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
/* Windows Explorer might rewrite the entire central directory, setting
this field to 2.0/MS-DOS for all files, so favor the local version,
which it leaves intact if it didn't alter that specific file. */
entry->version_needed = ui16;
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0); /* general bits. */
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
BAIL_IF(ui16 != entry->compression_method, PHYSFS_ERR_CORRUPT, 0);
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0); /* date/time */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 && (ui32 != entry->crc), PHYSFS_ERR_CORRUPT, 0);
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 && (ui32 != 0xFFFFFFFF) &&
(ui32 != entry->compressed_size), PHYSFS_ERR_CORRUPT, 0);
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 && (ui32 != 0xFFFFFFFF) &&
(ui32 != entry->uncompressed_size), PHYSFS_ERR_CORRUPT, 0);
BAIL_IF_ERRPASS(!readui16(io, &fnamelen), 0);
BAIL_IF_ERRPASS(!readui16(io, &extralen), 0);
entry->offset += fnamelen + extralen + 30;
return 1;
} /* zip_parse_local */
static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry)
{
int retval = 1;
const ZipResolveType resolve_type = entry->resolved;
if (resolve_type == ZIP_DIRECTORY)
return 1; /* we're good. */
/* Don't bother if we've failed to resolve this entry before. */
BAIL_IF(resolve_type == ZIP_BROKEN_FILE, PHYSFS_ERR_CORRUPT, 0);
BAIL_IF(resolve_type == ZIP_BROKEN_SYMLINK, PHYSFS_ERR_CORRUPT, 0);
/* uhoh...infinite symlink loop! */
BAIL_IF(resolve_type == ZIP_RESOLVING, PHYSFS_ERR_SYMLINK_LOOP, 0);
/*
* We fix up the offset to point to the actual data on the
* first open, since we don't want to seek across the whole file on
* archive open (can be SLOW on large, CD-stored files), but we
* need to check the local file header...not just for corruption,
* but since it stores offset info the central directory does not.
*/
if (resolve_type != ZIP_RESOLVED)
{
if (entry->tree.isdir) /* an ancestor dir that DirTree filled in? */
{
entry->resolved = ZIP_DIRECTORY;
return 1;
} /* if */
retval = zip_parse_local(io, entry);
if (retval)
{
/*
* If it's a symlink, find the original file. This will cause
* resolution of other entries (other symlinks and, eventually,
* the real file) if all goes well.
*/
if (resolve_type == ZIP_UNRESOLVED_SYMLINK)
retval = zip_resolve_symlink(io, info, entry);
} /* if */
if (resolve_type == ZIP_UNRESOLVED_SYMLINK)
entry->resolved = ((retval) ? ZIP_RESOLVED : ZIP_BROKEN_SYMLINK);
else if (resolve_type == ZIP_UNRESOLVED_FILE)
entry->resolved = ((retval) ? ZIP_RESOLVED : ZIP_BROKEN_FILE);
} /* if */
return retval;
} /* zip_resolve */
static int zip_entry_is_symlink(const ZIPentry *entry)
{
return ((entry->resolved == ZIP_UNRESOLVED_SYMLINK) ||
(entry->resolved == ZIP_BROKEN_SYMLINK) ||
(entry->symlink));
} /* zip_entry_is_symlink */
static int zip_version_does_symlinks(PHYSFS_uint32 version)
{
int retval = 0;
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((version >> 8) & 0xFF);
switch (hosttype)
{
/*
* These are the platforms that can NOT build an archive with
* symlinks, according to the Info-ZIP project.
*/
case 0: /* FS_FAT_ */
case 1: /* AMIGA_ */
case 2: /* VMS_ */
case 4: /* VM_CSM_ */
case 6: /* FS_HPFS_ */
case 11: /* FS_NTFS_ */
case 14: /* FS_VFAT_ */
case 13: /* ACORN_ */
case 15: /* MVS_ */
case 18: /* THEOS_ */
break; /* do nothing. */
default: /* assume the rest to be unix-like. */
retval = 1;
break;
} /* switch */
return retval;
} /* zip_version_does_symlinks */
static inline int zip_has_symlink_attr(const ZIPentry *entry,
const PHYSFS_uint32 extern_attr)
{
PHYSFS_uint16 xattr = ((extern_attr >> 16) & 0xFFFF);
return ( (zip_version_does_symlinks(entry->version)) &&
(entry->uncompressed_size > 0) &&
((xattr & UNIX_FILETYPE_MASK) == UNIX_FILETYPE_SYMLINK) );
} /* zip_has_symlink_attr */
static PHYSFS_sint64 zip_dos_time_to_physfs_time(PHYSFS_uint32 dostime)
{
PHYSFS_uint32 dosdate;
struct tm unixtime;
memset(&unixtime, '\0', sizeof (unixtime));
dosdate = (PHYSFS_uint32) ((dostime >> 16) & 0xFFFF);
dostime &= 0xFFFF;
/* dissect date */
unixtime.tm_year = ((dosdate >> 9) & 0x7F) + 80;
unixtime.tm_mon = ((dosdate >> 5) & 0x0F) - 1;
unixtime.tm_mday = ((dosdate ) & 0x1F);
/* dissect time */
unixtime.tm_hour = ((dostime >> 11) & 0x1F);
unixtime.tm_min = ((dostime >> 5) & 0x3F);
unixtime.tm_sec = ((dostime << 1) & 0x3E);
/* let mktime calculate daylight savings time. */
unixtime.tm_isdst = -1;
return ((PHYSFS_sint64) mktime(&unixtime));
} /* zip_dos_time_to_physfs_time */
static ZIPentry *zip_load_entry(ZIPinfo *info, const int zip64,
const PHYSFS_uint64 ofs_fixup)
{
PHYSFS_Io *io = info->io;
ZIPentry entry;
ZIPentry *retval = NULL;
PHYSFS_uint16 fnamelen, extralen, commentlen;
PHYSFS_uint32 external_attr;
PHYSFS_uint32 starting_disk;
PHYSFS_uint64 offset;
PHYSFS_uint16 ui16;
PHYSFS_uint32 ui32;
PHYSFS_sint64 si64;
char *name = NULL;
int isdir = 0;
/* sanity check with central directory signature... */
BAIL_IF_ERRPASS(!readui32(io, &ui32), NULL);
BAIL_IF(ui32 != ZIP_CENTRAL_DIR_SIG, PHYSFS_ERR_CORRUPT, NULL);
memset(&entry, '\0', sizeof (entry));
/* Get the pertinent parts of the record... */
BAIL_IF_ERRPASS(!readui16(io, &entry.version), NULL);
BAIL_IF_ERRPASS(!readui16(io, &entry.version_needed), NULL);
BAIL_IF_ERRPASS(!readui16(io, &entry.general_bits), NULL); /* general bits */
BAIL_IF_ERRPASS(!readui16(io, &entry.compression_method), NULL);
BAIL_IF_ERRPASS(!readui32(io, &entry.dos_mod_time), NULL);
entry.last_mod_time = zip_dos_time_to_physfs_time(entry.dos_mod_time);
BAIL_IF_ERRPASS(!readui32(io, &entry.crc), NULL);
BAIL_IF_ERRPASS(!readui32(io, &ui32), NULL);
entry.compressed_size = (PHYSFS_uint64) ui32;
BAIL_IF_ERRPASS(!readui32(io, &ui32), NULL);
entry.uncompressed_size = (PHYSFS_uint64) ui32;
BAIL_IF_ERRPASS(!readui16(io, &fnamelen), NULL);
BAIL_IF_ERRPASS(!readui16(io, &extralen), NULL);
BAIL_IF_ERRPASS(!readui16(io, &commentlen), NULL);
BAIL_IF_ERRPASS(!readui16(io, &ui16), NULL);
starting_disk = (PHYSFS_uint32) ui16;
BAIL_IF_ERRPASS(!readui16(io, &ui16), NULL); /* internal file attribs */
BAIL_IF_ERRPASS(!readui32(io, &external_attr), NULL);
BAIL_IF_ERRPASS(!readui32(io, &ui32), NULL);
offset = (PHYSFS_uint64) ui32;
name = (char *) __PHYSFS_smallAlloc(fnamelen + 1);
BAIL_IF(!name, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
if (!__PHYSFS_readAll(io, name, fnamelen))
{
__PHYSFS_smallFree(name);
return NULL;
} /* if */
if (name[fnamelen - 1] == '/')
{
name[fnamelen - 1] = '\0';
isdir = 1;
} /* if */
name[fnamelen] = '\0'; /* null-terminate the filename. */
zip_convert_dos_path(entry.version, name);
retval = (ZIPentry *) __PHYSFS_DirTreeAdd(&info->tree, name, isdir);
__PHYSFS_smallFree(name);
BAIL_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
/* It's okay to BAIL without freeing retval, because it's stored in the
__PHYSFS_DirTree and will be freed later anyhow. */
BAIL_IF(retval->last_mod_time != 0, PHYSFS_ERR_CORRUPT, NULL); /* dupe? */
/* Move the data we already read into place in the official object. */
memcpy(((PHYSFS_uint8 *) retval) + sizeof (__PHYSFS_DirTreeEntry),
((PHYSFS_uint8 *) &entry) + sizeof (__PHYSFS_DirTreeEntry),
sizeof (*retval) - sizeof (__PHYSFS_DirTreeEntry));
retval->symlink = NULL; /* will be resolved later, if necessary. */
if (isdir)
retval->resolved = ZIP_DIRECTORY;
else
{
retval->resolved = (zip_has_symlink_attr(retval, external_attr)) ?
ZIP_UNRESOLVED_SYMLINK : ZIP_UNRESOLVED_FILE;
} /* else */
si64 = io->tell(io);
BAIL_IF_ERRPASS(si64 == -1, NULL);
/* If the actual sizes didn't fit in 32-bits, look for the Zip64
extended information extra field... */
if ( (zip64) &&
((offset == 0xFFFFFFFF) ||
(starting_disk == 0xFFFFFFFF) ||
(retval->compressed_size == 0xFFFFFFFF) ||
(retval->uncompressed_size == 0xFFFFFFFF)) )
{
int found = 0;
PHYSFS_uint16 sig = 0;
PHYSFS_uint16 len = 0;
while (extralen > 4)
{
BAIL_IF_ERRPASS(!readui16(io, &sig), NULL);
BAIL_IF_ERRPASS(!readui16(io, &len), NULL);
si64 += 4 + len;
extralen -= 4 + len;
if (sig != ZIP64_EXTENDED_INFO_EXTRA_FIELD_SIG)
{
BAIL_IF_ERRPASS(!io->seek(io, si64), NULL);
continue;
} /* if */
found = 1;
break;
} /* while */
BAIL_IF(!found, PHYSFS_ERR_CORRUPT, NULL);
if (retval->uncompressed_size == 0xFFFFFFFF)
{
BAIL_IF(len < 8, PHYSFS_ERR_CORRUPT, NULL);
BAIL_IF_ERRPASS(!readui64(io, &retval->uncompressed_size), NULL);
len -= 8;
} /* if */
if (retval->compressed_size == 0xFFFFFFFF)
{
BAIL_IF(len < 8, PHYSFS_ERR_CORRUPT, NULL);
BAIL_IF_ERRPASS(!readui64(io, &retval->compressed_size), NULL);
len -= 8;
} /* if */
if (offset == 0xFFFFFFFF)
{
BAIL_IF(len < 8, PHYSFS_ERR_CORRUPT, NULL);
BAIL_IF_ERRPASS(!readui64(io, &offset), NULL);
len -= 8;
} /* if */
if (starting_disk == 0xFFFFFFFF)
{
BAIL_IF(len < 8, PHYSFS_ERR_CORRUPT, NULL);
BAIL_IF_ERRPASS(!readui32(io, &starting_disk), NULL);
len -= 4;
} /* if */
BAIL_IF(len != 0, PHYSFS_ERR_CORRUPT, NULL);
} /* if */
BAIL_IF(starting_disk != 0, PHYSFS_ERR_CORRUPT, NULL);
retval->offset = offset + ofs_fixup;
/* seek to the start of the next entry in the central directory... */
BAIL_IF_ERRPASS(!io->seek(io, si64 + extralen + commentlen), NULL);
return retval; /* success. */
} /* zip_load_entry */
/* This leaves things allocated on error; the caller will clean up the mess. */
static int zip_load_entries(ZIPinfo *info,
const PHYSFS_uint64 data_ofs,
const PHYSFS_uint64 central_ofs,
const PHYSFS_uint64 entry_count)
{
PHYSFS_Io *io = info->io;
const int zip64 = info->zip64;
PHYSFS_uint64 i;
BAIL_IF_ERRPASS(!io->seek(io, central_ofs), 0);
for (i = 0; i < entry_count; i++)
{
ZIPentry *entry = zip_load_entry(info, zip64, data_ofs);
BAIL_IF_ERRPASS(!entry, 0);
if (zip_entry_is_tradional_crypto(entry))
info->has_crypto = 1;
} /* for */
return 1;
} /* zip_load_entries */
static PHYSFS_sint64 zip64_find_end_of_central_dir(PHYSFS_Io *io,
PHYSFS_sint64 _pos,
PHYSFS_uint64 offset)
{
/*
* Naturally, the offset is useless to us; it is the offset from the
* start of file, which is meaningless if we've appended this .zip to
* a self-extracting .exe. We need to find this on our own. It should
* be directly before the locator record, but the record in question,
* like the original end-of-central-directory record, ends with a
* variable-length field. Unlike the original, which has to store the
* size of that variable-length field in a 16-bit int and thus has to be
* within 64k, the new one gets 64-bits.
*
* Fortunately, the only currently-specified record for that variable
* length block is some weird proprietary thing that deals with EBCDIC
* and tape backups or something. So we don't seek far.
*/
PHYSFS_uint32 ui32;
const PHYSFS_uint64 pos = (PHYSFS_uint64) _pos;
assert(_pos > 0);
/* Try offset specified in the Zip64 end of central directory locator. */
/* This works if the entire PHYSFS_Io is the zip file. */
BAIL_IF_ERRPASS(!io->seek(io, offset), -1);
BAIL_IF_ERRPASS(!readui32(io, &ui32), -1);
if (ui32 == ZIP64_END_OF_CENTRAL_DIR_SIG)
return offset;
/* Try 56 bytes before the Zip64 end of central directory locator. */
/* This works if the record isn't variable length and is version 1. */
if (pos > 56)
{
BAIL_IF_ERRPASS(!io->seek(io, pos-56), -1);
BAIL_IF_ERRPASS(!readui32(io, &ui32), -1);
if (ui32 == ZIP64_END_OF_CENTRAL_DIR_SIG)
return pos-56;
} /* if */
/* Try 84 bytes before the Zip64 end of central directory locator. */
/* This works if the record isn't variable length and is version 2. */
if (pos > 84)
{
BAIL_IF_ERRPASS(!io->seek(io, pos-84), -1);
BAIL_IF_ERRPASS(!readui32(io, &ui32), -1);
if (ui32 == ZIP64_END_OF_CENTRAL_DIR_SIG)
return pos-84;
} /* if */
/* Ok, brute force: we know it's between (offset) and (pos) somewhere. */
/* Just try moving back at most 256k. Oh well. */
if ((offset < pos) && (pos > 4))
{
const size_t maxbuflen = 256 * 1024;
size_t len = (size_t) (pos - offset);
PHYSFS_uint8 *buf = NULL;
PHYSFS_sint32 i;
if (len > maxbuflen)
len = maxbuflen;
buf = (PHYSFS_uint8 *) __PHYSFS_smallAlloc(len);
BAIL_IF(!buf, PHYSFS_ERR_OUT_OF_MEMORY, -1);
if (!io->seek(io, pos - len) || !__PHYSFS_readAll(io, buf, len))
{
__PHYSFS_smallFree(buf);
return -1; /* error was set elsewhere. */
} /* if */
for (i = (PHYSFS_sint32) (len - 4); i >= 0; i--)
{
if ( (buf[i] == 0x50) && (buf[i+1] == 0x4b) &&
(buf[i+2] == 0x06) && (buf[i+3] == 0x06) )
{
__PHYSFS_smallFree(buf);
return pos - ((PHYSFS_sint64) (len - i));
} /* if */
} /* for */
__PHYSFS_smallFree(buf);
} /* if */
BAIL(PHYSFS_ERR_CORRUPT, -1); /* didn't find it. */
} /* zip64_find_end_of_central_dir */
static int zip64_parse_end_of_central_dir(ZIPinfo *info,
PHYSFS_uint64 *data_start,
PHYSFS_uint64 *dir_ofs,
PHYSFS_uint64 *entry_count,
PHYSFS_sint64 pos)
{
PHYSFS_Io *io = info->io;
PHYSFS_uint64 ui64;
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
/* We should be positioned right past the locator signature. */
if ((pos < 0) || (!io->seek(io, pos)))
return 0;
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
if (ui32 != ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR_SIG)
return -1; /* it's not a Zip64 archive. Not an error, though! */
info->zip64 = 1;
/* number of the disk with the start of the central directory. */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 != 0, PHYSFS_ERR_CORRUPT, 0);
/* offset of Zip64 end of central directory record. */
BAIL_IF_ERRPASS(!readui64(io, &ui64), 0);
/* total number of disks */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 != 1, PHYSFS_ERR_CORRUPT, 0);
pos = zip64_find_end_of_central_dir(io, pos, ui64);
if (pos < 0)
return 0; /* oh well. */
/*
* For self-extracting archives, etc, there's crapola in the file
* before the zipfile records; we calculate how much data there is
* prepended by determining how far the zip64-end-of-central-directory
* offset is from where it is supposed to be...the difference in bytes
* is how much arbitrary data is at the start of the physical file.
*/
assert(((PHYSFS_uint64) pos) >= ui64);
*data_start = ((PHYSFS_uint64) pos) - ui64;
BAIL_IF_ERRPASS(!io->seek(io, pos), 0);
/* check signature again, just in case. */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 != ZIP64_END_OF_CENTRAL_DIR_SIG, PHYSFS_ERR_CORRUPT, 0);
/* size of Zip64 end of central directory record. */
BAIL_IF_ERRPASS(!readui64(io, &ui64), 0);
/* version made by. */
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
/* version needed to extract. */
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
/* number of this disk. */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 != 0, PHYSFS_ERR_CORRUPT, 0);
/* number of disk with start of central directory record. */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 != 0, PHYSFS_ERR_CORRUPT, 0);
/* total number of entries in the central dir on this disk */
BAIL_IF_ERRPASS(!readui64(io, &ui64), 0);
/* total number of entries in the central dir */
BAIL_IF_ERRPASS(!readui64(io, entry_count), 0);
BAIL_IF(ui64 != *entry_count, PHYSFS_ERR_CORRUPT, 0);
/* size of the central directory */
BAIL_IF_ERRPASS(!readui64(io, &ui64), 0);
/* offset of central directory */
BAIL_IF_ERRPASS(!readui64(io, dir_ofs), 0);
/* Since we know the difference, fix up the central dir offset... */
*dir_ofs += *data_start;
/*
* There are more fields here, for encryption and feature-specific things,
* but we don't care about any of them at the moment.
*/
return 1; /* made it. */
} /* zip64_parse_end_of_central_dir */
static int zip_parse_end_of_central_dir(ZIPinfo *info,
PHYSFS_uint64 *data_start,
PHYSFS_uint64 *dir_ofs,
PHYSFS_uint64 *entry_count)
{
PHYSFS_Io *io = info->io;
PHYSFS_uint16 entryCount16;
PHYSFS_uint32 offset32;
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_sint64 len;
PHYSFS_sint64 pos;
int rc;
/* find the end-of-central-dir record, and seek to it. */
pos = zip_find_end_of_central_dir(io, &len);
BAIL_IF_ERRPASS(pos == -1, 0);
BAIL_IF_ERRPASS(!io->seek(io, pos), 0);
/* check signature again, just in case. */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 != ZIP_END_OF_CENTRAL_DIR_SIG, PHYSFS_ERR_CORRUPT, 0);
/* Seek back to see if "Zip64 end of central directory locator" exists. */
/* this record is 20 bytes before end-of-central-dir */
rc = zip64_parse_end_of_central_dir(info, data_start, dir_ofs,
entry_count, pos - 20);
/* Error or success? Bounce out of here. Keep going if not zip64. */
if ((rc == 0) || (rc == 1))
return rc;
assert(rc == -1); /* no error, just not a Zip64 archive. */
/* Not Zip64? Seek back to where we were and keep processing. */
BAIL_IF_ERRPASS(!io->seek(io, pos + 4), 0);
/* number of this disk */
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
BAIL_IF(ui16 != 0, PHYSFS_ERR_CORRUPT, 0);
/* number of the disk with the start of the central directory */
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
BAIL_IF(ui16 != 0, PHYSFS_ERR_CORRUPT, 0);
/* total number of entries in the central dir on this disk */
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
/* total number of entries in the central dir */
BAIL_IF_ERRPASS(!readui16(io, &entryCount16), 0);
BAIL_IF(ui16 != entryCount16, PHYSFS_ERR_CORRUPT, 0);
*entry_count = entryCount16;
/* size of the central directory */
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
/* offset of central directory */
BAIL_IF_ERRPASS(!readui32(io, &offset32), 0);
*dir_ofs = (PHYSFS_uint64) offset32;
BAIL_IF(((PHYSFS_uint64) pos) < (*dir_ofs + ui32), PHYSFS_ERR_CORRUPT, 0);
/*
* For self-extracting archives, etc, there's crapola in the file
* before the zipfile records; we calculate how much data there is
* prepended by determining how far the central directory offset is
* from where it is supposed to be (start of end-of-central-dir minus
* sizeof central dir)...the difference in bytes is how much arbitrary
* data is at the start of the physical file.
*/
*data_start = (PHYSFS_uint64) (pos - (*dir_ofs + ui32));
/* Now that we know the difference, fix up the central dir offset... */
*dir_ofs += *data_start;
/* zipfile comment length */
BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
/*
* Make sure that the comment length matches to the end of file...
* If it doesn't, we're either in the wrong part of the file, or the
* file is corrupted, but we give up either way.
*/
BAIL_IF((pos + 22 + ui16) != len, PHYSFS_ERR_CORRUPT, 0);
return 1; /* made it. */
} /* zip_parse_end_of_central_dir */
static void ZIP_closeArchive(void *opaque)
{
ZIPinfo *info = (ZIPinfo *) (opaque);
if (!info)
return;
if (info->io)
info->io->destroy(info->io);
__PHYSFS_DirTreeDeinit(&info->tree);
allocator.Free(info);
} /* ZIP_closeArchive */
static void *ZIP_openArchive(PHYSFS_Io *io, const char *name,
int forWriting, int *claimed)
{
ZIPinfo *info = NULL;
ZIPentry *root = NULL;
PHYSFS_uint64 dstart = 0; /* data start */
PHYSFS_uint64 cdir_ofs; /* central dir offset */
PHYSFS_uint64 count;
assert(io != NULL); /* shouldn't ever happen. */
BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
BAIL_IF_ERRPASS(!isZip(io), NULL);
*claimed = 1;
info = (ZIPinfo *) allocator.Malloc(sizeof (ZIPinfo));
BAIL_IF(!info, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
memset(info, '\0', sizeof (ZIPinfo));
info->io = io;
if (!zip_parse_end_of_central_dir(info, &dstart, &cdir_ofs, &count))
goto ZIP_openarchive_failed;
else if (!__PHYSFS_DirTreeInit(&info->tree, sizeof (ZIPentry), 1, 0))
goto ZIP_openarchive_failed;
root = (ZIPentry *) info->tree.root;
root->resolved = ZIP_DIRECTORY;
if (!zip_load_entries(info, dstart, cdir_ofs, count))
goto ZIP_openarchive_failed;
assert(info->tree.root->sibling == NULL);
return info;
ZIP_openarchive_failed:
info->io = NULL; /* don't let ZIP_closeArchive destroy (io). */
ZIP_closeArchive(info);
return NULL;
} /* ZIP_openArchive */
static PHYSFS_Io *zip_get_io(PHYSFS_Io *io, ZIPinfo *inf, ZIPentry *entry)
{
int success;
PHYSFS_Io *retval = io->duplicate(io);
BAIL_IF_ERRPASS(!retval, NULL);
assert(!entry->tree.isdir); /* should have been checked before calling. */
/* (inf) can be NULL if we already resolved. */
success = (inf == NULL) || zip_resolve(retval, inf, entry);
if (success)
{
PHYSFS_sint64 offset;
offset = ((entry->symlink) ? entry->symlink->offset : entry->offset);
success = retval->seek(retval, offset);
} /* if */
if (!success)
{
retval->destroy(retval);
retval = NULL;
} /* if */
return retval;
} /* zip_get_io */
static PHYSFS_Io *ZIP_openRead(void *opaque, const char *filename)
{
PHYSFS_Io *retval = NULL;
ZIPinfo *info = (ZIPinfo *) opaque;
ZIPentry *entry = zip_find_entry(info, filename);
ZIPfileinfo *finfo = NULL;
PHYSFS_Io *io = NULL;
PHYSFS_uint8 *password = NULL;
/* if not found, see if maybe "$PASSWORD" is appended. */
if ((!entry) && (info->has_crypto))
{
const char *ptr = strrchr(filename, '$');
if (ptr != NULL)
{
const size_t len = (size_t) (ptr - filename);
char *str = (char *) __PHYSFS_smallAlloc(len + 1);
BAIL_IF(!str, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
memcpy(str, filename, len);
str[len] = '\0';
entry = zip_find_entry(info, str);
__PHYSFS_smallFree(str);
password = (PHYSFS_uint8 *) (ptr + 1);
} /* if */
} /* if */
BAIL_IF_ERRPASS(!entry, NULL);
BAIL_IF_ERRPASS(!zip_resolve(info->io, info, entry), NULL);
BAIL_IF(entry->tree.isdir, PHYSFS_ERR_NOT_A_FILE, NULL);
retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
GOTO_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, ZIP_openRead_failed);
finfo = (ZIPfileinfo *) allocator.Malloc(sizeof (ZIPfileinfo));
GOTO_IF(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, ZIP_openRead_failed);
memset(finfo, '\0', sizeof (ZIPfileinfo));
io = zip_get_io(info->io, info, entry);
GOTO_IF_ERRPASS(!io, ZIP_openRead_failed);
finfo->io = io;
finfo->entry = ((entry->symlink != NULL) ? entry->symlink : entry);
initializeZStream(&finfo->stream);
if (finfo->entry->compression_method != COMPMETH_NONE)
{
finfo->buffer = (PHYSFS_uint8 *) allocator.Malloc(ZIP_READBUFSIZE);
if (!finfo->buffer)
GOTO(PHYSFS_ERR_OUT_OF_MEMORY, ZIP_openRead_failed);
else if (zlib_err(inflateInit2(&finfo->stream, -MAX_WBITS)) != Z_OK)
goto ZIP_openRead_failed;
} /* if */
if (!zip_entry_is_tradional_crypto(entry))
GOTO_IF(password != NULL, PHYSFS_ERR_BAD_PASSWORD, ZIP_openRead_failed);
else
{
PHYSFS_uint8 crypto_header[12];
GOTO_IF(password == NULL, PHYSFS_ERR_BAD_PASSWORD, ZIP_openRead_failed);
if (io->read(io, crypto_header, 12) != 12)
goto ZIP_openRead_failed;
else if (!zip_prep_crypto_keys(finfo, crypto_header, password))
goto ZIP_openRead_failed;
} /* if */
memcpy(retval, &ZIP_Io, sizeof (PHYSFS_Io));
retval->opaque = finfo;
return retval;
ZIP_openRead_failed:
if (finfo != NULL)
{
if (finfo->io != NULL)
finfo->io->destroy(finfo->io);
if (finfo->buffer != NULL)
{
allocator.Free(finfo->buffer);
inflateEnd(&finfo->stream);
} /* if */
allocator.Free(finfo);
} /* if */
if (retval != NULL)
allocator.Free(retval);
return NULL;
} /* ZIP_openRead */
static PHYSFS_Io *ZIP_openWrite(void *opaque, const char *filename)
{
BAIL(PHYSFS_ERR_READ_ONLY, NULL);
} /* ZIP_openWrite */
static PHYSFS_Io *ZIP_openAppend(void *opaque, const char *filename)
{
BAIL(PHYSFS_ERR_READ_ONLY, NULL);
} /* ZIP_openAppend */
static int ZIP_remove(void *opaque, const char *name)
{
BAIL(PHYSFS_ERR_READ_ONLY, 0);
} /* ZIP_remove */
static int ZIP_mkdir(void *opaque, const char *name)
{
BAIL(PHYSFS_ERR_READ_ONLY, 0);
} /* ZIP_mkdir */
static int ZIP_stat(void *opaque, const char *filename, PHYSFS_Stat *stat)
{
ZIPinfo *info = (ZIPinfo *) opaque;
ZIPentry *entry = zip_find_entry(info, filename);
if (entry == NULL)
return 0;
else if (!zip_resolve(info->io, info, entry))
return 0;
else if (entry->resolved == ZIP_DIRECTORY)
{
stat->filesize = 0;
stat->filetype = PHYSFS_FILETYPE_DIRECTORY;
} /* if */
else if (zip_entry_is_symlink(entry))
{
stat->filesize = 0;
stat->filetype = PHYSFS_FILETYPE_SYMLINK;
} /* else if */
else
{
stat->filesize = (PHYSFS_sint64) entry->uncompressed_size;
stat->filetype = PHYSFS_FILETYPE_REGULAR;
} /* else */
stat->modtime = ((entry) ? entry->last_mod_time : 0);
stat->createtime = stat->modtime;
stat->accesstime = -1;
stat->readonly = 1; /* .zip files are always read only */
return 1;
} /* ZIP_stat */
const PHYSFS_Archiver __PHYSFS_Archiver_ZIP =
{
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
{
"ZIP",
"PkZip/WinZip/Info-Zip compatible",
"Ryan C. Gordon <icculus@icculus.org>",
"https://icculus.org/physfs/",
1, /* supportsSymlinks */
},
ZIP_openArchive,
__PHYSFS_DirTreeEnumerate,
ZIP_openRead,
ZIP_openWrite,
ZIP_openAppend,
ZIP_remove,
ZIP_mkdir,
ZIP_stat,
ZIP_closeArchive
};
#endif /* defined PHYSFS_SUPPORTS_ZIP */
/* end of physfs_archiver_zip.c ... */
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