/
physfs_archiver_zip.c
1718 lines (1388 loc) · 53.3 KB
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/*
* ZIP support routines for PhysicsFS.
*
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* Please see the file LICENSE.txt in the source's root directory.
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* This file written by Ryan C. Gordon, with some peeking at "unzip.c"
* by Gilles Vollant.
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#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if PHYSFS_SUPPORTS_ZIP
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#include <errno.h>
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#include <time.h>
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#if (PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN)
#define MINIZ_LITTLE_ENDIAN 1
#else
#define MINIZ_LITTLE_ENDIAN 0
#endif
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#include "physfs_miniz.h"
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* 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
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* 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)
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/*
* 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,
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ZIP_DIRECTORY,
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ZIP_BROKEN_FILE,
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ZIP_BROKEN_SYMLINK
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} ZipResolveType;
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/*
* One ZIPentry is kept for each file in an open ZIP archive.
*/
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typedef struct _ZIPentry
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__PHYSFS_DirTreeEntry tree; /* manages directory tree */
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struct _ZIPentry *symlink; /* NULL or file we symlink to */
ZipResolveType resolved; /* Have we resolved file/symlink? */
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PHYSFS_uint64 offset; /* offset of data in archive */
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PHYSFS_uint16 version; /* version made by */
PHYSFS_uint16 version_needed; /* version needed to extract */
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PHYSFS_uint16 general_bits; /* general purpose bits */
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PHYSFS_uint16 compression_method; /* compression method */
PHYSFS_uint32 crc; /* crc-32 */
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PHYSFS_uint64 compressed_size; /* compressed size */
PHYSFS_uint64 uncompressed_size; /* uncompressed size */
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PHYSFS_sint64 last_mod_time; /* last file mod time */
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PHYSFS_uint32 dos_mod_time; /* original MS-DOS style mod time */
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/*
* One ZIPinfo is kept for each open ZIP archive.
*/
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typedef struct
{
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__PHYSFS_DirTree tree; /* manages directory tree. */
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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. */
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/*
* One ZIPfileinfo is kept for each open file in a ZIP archive.
*/
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typedef struct
{
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ZIPentry *entry; /* Info on file. */
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PHYSFS_Io *io; /* physical file handle. */
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PHYSFS_uint32 compressed_position; /* offset in compressed data. */
PHYSFS_uint32 uncompressed_position; /* tell() position. */
PHYSFS_uint8 *buffer; /* decompression buffer. */
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PHYSFS_uint32 crypto_keys[3]; /* for "traditional" crypto. */
PHYSFS_uint32 initial_crypto_keys[3]; /* for "traditional" crypto. */
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z_stream stream; /* zlib stream state. */
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} ZIPfileinfo;
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/* Magic numbers... */
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#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
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/* compression methods... */
#define COMPMETH_NONE 0
/* ...and others... */
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#define UNIX_FILETYPE_MASK 0170000
#define UNIX_FILETYPE_SYMLINK 0120000
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#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)
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BAIL(PHYSFS_ERR_BAD_PASSWORD, 0);
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/* save the initial vector for seeking purposes. Not secure!! */
memcpy(finfo->initial_crypto_keys, finfo->crypto_keys, 12);
return 1;
} /* zip_prep_crypto_keys */
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/*
* Bridge physfs allocation functions to zlib's format...
*/
static voidpf zlibPhysfsAlloc(voidpf opaque, uInt items, uInt size)
{
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return ((PHYSFS_Allocator *) opaque)->Malloc(items * size);
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} /* zlibPhysfsAlloc */
/*
* Bridge physfs allocation functions to zlib's format...
*/
static void zlibPhysfsFree(voidpf opaque, voidpf address)
{
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((PHYSFS_Allocator *) opaque)->Free(address);
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} /* 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;
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pstr->opaque = &allocator;
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} /* initializeZStream */
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static PHYSFS_ErrorCode zlib_error_code(int rc)
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{
switch (rc)
{
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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;
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} /* switch */
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} /* zlib_error_string */
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/*
* Wrap all zlib calls in this, so the physfs error state is set appropriately.
*/
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static int zlib_err(const int rc)
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PHYSFS_setErrorCode(zlib_error_code(rc));
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} /* zlib_err */
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/*
* Read an unsigned 64-bit int and swap to native byte order.
*/
static int readui64(PHYSFS_Io *io, PHYSFS_uint64 *val)
{
PHYSFS_uint64 v;
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
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*val = PHYSFS_swapULE64(v);
return 1;
} /* readui64 */
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/*
* Read an unsigned 32-bit int and swap to native byte order.
*/
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static int readui32(PHYSFS_Io *io, PHYSFS_uint32 *val)
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{
PHYSFS_uint32 v;
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
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*val = PHYSFS_swapULE32(v);
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} /* readui32 */
/*
* Read an unsigned 16-bit int and swap to native byte order.
*/
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static int readui16(PHYSFS_Io *io, PHYSFS_uint16 *val)
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{
PHYSFS_uint16 v;
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BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
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*val = PHYSFS_swapULE16(v);
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} /* readui16 */
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static PHYSFS_sint64 ZIP_read(PHYSFS_Io *_io, void *buf, PHYSFS_uint64 len)
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ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque;
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ZIPentry *entry = finfo->entry;
PHYSFS_sint64 retval = 0;
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PHYSFS_sint64 maxread = (PHYSFS_sint64) len;
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PHYSFS_sint64 avail = entry->uncompressed_size -
finfo->uncompressed_position;
if (avail < maxread)
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maxread = avail;
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BAIL_IF_ERRPASS(maxread == 0, 0); /* quick rejection. */
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if (entry->compression_method == COMPMETH_NONE)
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retval = zip_read_decrypt(finfo, buf, maxread);
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else
{
finfo->stream.next_out = buf;
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finfo->stream.avail_out = (uInt) maxread;
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while (retval < maxread)
{
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const PHYSFS_uint32 before = (PHYSFS_uint32) finfo->stream.total_out;
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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;
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br = zip_read_decrypt(finfo, finfo->buffer, (PHYSFS_uint64) br);
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if (br <= 0)
break;
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finfo->compressed_position += (PHYSFS_uint32) br;
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finfo->stream.next_in = finfo->buffer;
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finfo->stream.avail_in = (unsigned int) br;
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} /* if */
} /* if */
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rc = zlib_err(inflate(&finfo->stream, Z_SYNC_FLUSH));
retval += (finfo->stream.total_out - before);
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if (rc != Z_OK)
break;
} /* while */
} /* else */
if (retval > 0)
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finfo->uncompressed_position += (PHYSFS_uint32) retval;
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return retval;
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} /* ZIP_read */
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static PHYSFS_sint64 ZIP_write(PHYSFS_Io *io, const void *b, PHYSFS_uint64 len)
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BAIL(PHYSFS_ERR_READ_ONLY, -1);
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} /* ZIP_write */
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static PHYSFS_sint64 ZIP_tell(PHYSFS_Io *io)
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return ((ZIPfileinfo *) io->opaque)->uncompressed_position;
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} /* ZIP_tell */
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static int ZIP_seek(PHYSFS_Io *_io, PHYSFS_uint64 offset)
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ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque;
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ZIPentry *entry = finfo->entry;
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PHYSFS_Io *io = finfo->io;
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const int encrypted = zip_entry_is_tradional_crypto(entry);
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BAIL_IF(offset > entry->uncompressed_size, PHYSFS_ERR_PAST_EOF, 0);
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if (!encrypted && (entry->compression_method == COMPMETH_NONE))
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PHYSFS_sint64 newpos = offset + entry->offset;
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BAIL_IF_ERRPASS(!io->seek(io, newpos), 0);
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finfo->uncompressed_position = (PHYSFS_uint32) offset;
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} /* if */
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else
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/*
* 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
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* decode, but we don't rewind first.
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*/
if (offset < finfo->uncompressed_position)
{
/* we do a copy so state is sane if inflateInit2() fails. */
z_stream str;
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initializeZStream(&str);
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if (zlib_err(inflateInit2(&str, -MAX_WBITS)) != Z_OK)
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if (!io->seek(io, entry->offset + (encrypted ? 12 : 0)))
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inflateEnd(&finfo->stream);
memcpy(&finfo->stream, &str, sizeof (z_stream));
finfo->uncompressed_position = finfo->compressed_position = 0;
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if (encrypted)
memcpy(finfo->crypto_keys, finfo->initial_crypto_keys, 12);
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} /* if */
while (finfo->uncompressed_position != offset)
{
PHYSFS_uint8 buf[512];
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PHYSFS_uint32 maxread;
maxread = (PHYSFS_uint32) (offset - finfo->uncompressed_position);
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if (maxread > sizeof (buf))
maxread = sizeof (buf);
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if (ZIP_read(_io, buf, maxread) != maxread)
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} /* while */
} /* else */
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} /* ZIP_seek */
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static PHYSFS_sint64 ZIP_length(PHYSFS_Io *io)
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const ZIPfileinfo *finfo = (ZIPfileinfo *) io->opaque;
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return (PHYSFS_sint64) finfo->entry->uncompressed_size;
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} /* ZIP_length */
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static PHYSFS_Io *zip_get_io(PHYSFS_Io *io, ZIPinfo *inf, ZIPentry *entry);
static PHYSFS_Io *ZIP_duplicate(PHYSFS_Io *io)
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ZIPfileinfo *origfinfo = (ZIPfileinfo *) io->opaque;
PHYSFS_Io *retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
ZIPfileinfo *finfo = (ZIPfileinfo *) allocator.Malloc(sizeof (ZIPfileinfo));
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GOTO_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, failed);
GOTO_IF(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, failed);
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memset(finfo, '\0', sizeof (*finfo));
finfo->entry = origfinfo->entry;
finfo->io = zip_get_io(origfinfo->io, NULL, finfo->entry);
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GOTO_IF_ERRPASS(!finfo->io, failed);
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initializeZStream(&finfo->stream);
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if (finfo->entry->compression_method != COMPMETH_NONE)
{
finfo->buffer = (PHYSFS_uint8 *) allocator.Malloc(ZIP_READBUFSIZE);
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GOTO_IF(!finfo->buffer, PHYSFS_ERR_OUT_OF_MEMORY, failed);
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if (zlib_err(inflateInit2(&finfo->stream, -MAX_WBITS)) != Z_OK)
goto failed;
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} /* if */
memcpy(retval, io, sizeof (PHYSFS_Io));
retval->opaque = finfo;
return retval;
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failed:
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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);
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if (finfo->entry->compression_method != COMPMETH_NONE)
inflateEnd(&finfo->stream);
if (finfo->buffer != NULL)
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allocator.Free(finfo->buffer);
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allocator.Free(finfo);
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allocator.Free(io);
} /* ZIP_destroy */
static const PHYSFS_Io ZIP_Io =
{
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CURRENT_PHYSFS_IO_API_VERSION, NULL,
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ZIP_read,
ZIP_write,
ZIP_seek,
ZIP_tell,
ZIP_length,
ZIP_duplicate,
ZIP_flush,
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ZIP_destroy
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static PHYSFS_sint64 zip_find_end_of_central_dir(PHYSFS_Io *io, PHYSFS_sint64 *len)
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PHYSFS_uint8 buf[256];
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PHYSFS_uint8 extra[4] = { 0, 0, 0, 0 };
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PHYSFS_sint32 i = 0;
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PHYSFS_sint64 filelen;
PHYSFS_sint64 filepos;
PHYSFS_sint32 maxread;
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PHYSFS_sint32 totalread = 0;
int found = 0;
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filelen = io->length(io);
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BAIL_IF_ERRPASS(filelen == -1, -1);
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/*
* 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
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* searching for that signature after a little more than 64k at most,
* and call it a corrupted zipfile.
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*/
if (sizeof (buf) < filelen)
{
filepos = filelen - sizeof (buf);
maxread = sizeof (buf);
} /* if */
else
{
filepos = 0;
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maxread = (PHYSFS_uint32) filelen;
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} /* else */
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while ((totalread < filelen) && (totalread < 65557))
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BAIL_IF_ERRPASS(!io->seek(io, filepos), -1);
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/* make sure we catch a signature between buffers. */
if (totalread != 0)
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if (!__PHYSFS_readAll(io, buf, maxread - 4))
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memcpy(&buf[maxread - 4], extra, sizeof (extra));
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totalread += maxread - 4;
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} /* if */
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if (!__PHYSFS_readAll(io, buf, maxread))
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totalread += maxread;
} /* else */
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memcpy(extra, buf, sizeof (extra));
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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);
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if (filepos < 0)
filepos = 0;
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} /* while */
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BAIL_IF(!found, PHYSFS_ERR_UNSUPPORTED, -1);
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if (len != NULL)
*len = filelen;
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return (filepos + i);
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} /* zip_find_end_of_central_dir */
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static int isZip(PHYSFS_Io *io)
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PHYSFS_uint32 sig = 0;
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int retval = 0;
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624
625
/*
* The first thing in a zip file might be the signature of the
* first local file record, so it makes for a quick determination.
*/
626
if (readui32(io, &sig))
628
629
630
631
632
633
634
635
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...
*/
636
retval = (zip_find_end_of_central_dir(io, NULL) != -1);
637
} /* if */
640
return retval;
641
} /* isZip */
644
/* Convert paths from old, buggy DOS zippers... */
645
static void zip_convert_dos_path(const PHYSFS_uint16 entryversion, char *path)
647
const PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((entryversion >> 8) & 0xFF);
648
649
650
651
652
653
654
655
656
657
if (hosttype == 0) /* FS_FAT_ */
{
while (*path)
{
if (*path == '\\')
*path = '/';
path++;
} /* while */
} /* if */
} /* zip_convert_dos_path */
658
659
660
static void zip_expand_symlink_path(char *path)
662
663
char *ptr = path;
char *prevptr = path;
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
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684
685
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687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
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 */
703
704
705
706
707
708
709
710
711
712
if (*(ptr + 3) == '\0')
{
/* parent dir at end: move back one, if possible. */
*prevptr = '\0';
} /* if */
} /* if */
} /* if */
else
{
prevptr = ptr;
714
715
716
} /* else */
} /* while */
} /* zip_expand_symlink_path */
719
720
721
722
723
static inline ZIPentry *zip_find_entry(ZIPinfo *info, const char *path)
{
return (ZIPentry *) __PHYSFS_DirTreeFind(&info->tree, path);
} /* zip_find_entry */
724
/* (forward reference: zip_follow_symlink and zip_resolve call each other.) */
725
static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry);
728
729
730
* 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.
731
* If there's a problem, return NULL.
733
static ZIPentry *zip_follow_symlink(PHYSFS_Io *io, ZIPinfo *info, char *path)
735
736
737
ZIPentry *entry;
zip_expand_symlink_path(path);
738
entry = zip_find_entry(info, path);
739
740
if (entry != NULL)
{
741
if (!zip_resolve(io, info, entry)) /* recursive! */
742
743
744
745
746
747
748
749
entry = NULL;
else
{
if (entry->symlink != NULL)
entry = entry->symlink;
} /* else */
} /* if */
751
} /* zip_follow_symlink */
754
static int zip_resolve_symlink(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry)
756
const size_t size = (size_t) entry->uncompressed_size;
757
char *path = NULL;
758
759
int rc = 0;
760
761
762
763
764
765
/*
* 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.
*/
766
BAIL_IF_ERRPASS(!io->seek(io, entry->offset), 0);
768
path = (char *) __PHYSFS_smallAlloc(size + 1);
769
BAIL_IF(!path, PHYSFS_ERR_OUT_OF_MEMORY, 0);
770
771
if (entry->compression_method == COMPMETH_NONE)
772
rc = __PHYSFS_readAll(io, path, size);
773
774
775
776
else /* symlink target path is compressed... */
{
z_stream stream;
777
const size_t complen = (size_t) entry->compressed_size;
778
PHYSFS_uint8 *compressed = (PHYSFS_uint8*) __PHYSFS_smallAlloc(complen);
779
780
if (compressed != NULL)
{
781
if (__PHYSFS_readAll(io, compressed, complen))
783
initializeZStream(&stream);
784
stream.next_in = compressed;
785
stream.avail_in = (unsigned int) complen;
786
stream.next_out = (unsigned char *) path;
787
stream.avail_out = (unsigned int) size;
788
789
if (zlib_err(inflateInit2(&stream, -MAX_WBITS)) == Z_OK)
{
790
rc = zlib_err(inflate(&stream, Z_FINISH));
791
inflateEnd(&stream);
792
793
794
/* both are acceptable outcomes... */
rc = ((rc == Z_OK) || (rc == Z_STREAM_END));
795
796
} /* if */
} /* if */
797
__PHYSFS_smallFree(compressed);
798
799
} /* if */
} /* else */
801
if (rc)
802
803
{
path[entry->uncompressed_size] = '\0'; /* null-terminate it. */
804
zip_convert_dos_path(entry->version, path);
805
entry->symlink = zip_follow_symlink(io, info, path);
806
807
} /* else */
808
809
__PHYSFS_smallFree(path);
810
return (entry->symlink != NULL);
811
812
813
814
815
816
} /* zip_resolve_symlink */
/*
* Parse the local file header of an entry, and update entry->offset.
*/
817
static int zip_parse_local(PHYSFS_Io *io, ZIPentry *entry)
818
819
820
821
822
823
{
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_uint16 fnamelen;
PHYSFS_uint16 extralen;
824
825
826
827
828
/*
* 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.
829
830
* We also ignore a mismatch if the value is 0xFFFFFFFF here, since it's
* possible that's a Zip64 thing.
833
834
835
836
/* !!! 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. */
837
838
839
840
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);
841
842
843
844
/* 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;
845
846
847
848
849
850
851
852
853
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) &&
854
855
(ui32 != entry->compressed_size), PHYSFS_ERR_CORRUPT, 0);
856
857
BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
BAIL_IF(ui32 && (ui32 != 0xFFFFFFFF) &&
858
859
(ui32 != entry->uncompressed_size), PHYSFS_ERR_CORRUPT, 0);
860
861
BAIL_IF_ERRPASS(!readui16(io, &fnamelen), 0);
BAIL_IF_ERRPASS(!readui16(io, &extralen), 0);
862
863
entry->offset += fnamelen + extralen + 30;
865
866
867
} /* zip_parse_local */
868
static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry)
869
870
{
int retval = 1;
871
872
873
874
const ZipResolveType resolve_type = entry->resolved;
if (resolve_type == ZIP_DIRECTORY)
return 1; /* we're good. */
875
876
/* Don't bother if we've failed to resolve this entry before. */
877
878
BAIL_IF(resolve_type == ZIP_BROKEN_FILE, PHYSFS_ERR_CORRUPT, 0);
BAIL_IF(resolve_type == ZIP_BROKEN_SYMLINK, PHYSFS_ERR_CORRUPT, 0);
879
880
/* uhoh...infinite symlink loop! */
881
BAIL_IF(resolve_type == ZIP_RESOLVING, PHYSFS_ERR_SYMLINK_LOOP, 0);
882
883
884
885
886
887
888
889
890
891
/*
* 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)
{
892
893
894
895
896
if (entry->tree.isdir) /* an ancestor dir that DirTree filled in? */
{
entry->resolved = ZIP_DIRECTORY;
return 1;
} /* if */
898
retval = zip_parse_local(io, entry);
899
900
901
902
903
904
905
906
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)
907
retval = zip_resolve_symlink(io, info, entry);
908
909
910
911
912
913
} /* 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);
914
} /* if */
916
return retval;
917
} /* zip_resolve */
920
921
922
923
924
925
926
927
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 */
928
static int zip_version_does_symlinks(PHYSFS_uint32 version)
929
930
{
int retval = 0;
931
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((version >> 8) & 0xFF);
932
933
934
switch (hosttype)
{
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
/*
* 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. */
952
953
954
955
retval = 1;
break;
} /* switch */
956
return retval;
957
958
959
} /* zip_version_does_symlinks */
960
961
static inline int zip_has_symlink_attr(const ZIPentry *entry,
const PHYSFS_uint32 extern_attr)
963
PHYSFS_uint16 xattr = ((extern_attr >> 16) & 0xFFFF);
964
965
966
return ( (zip_version_does_symlinks(entry->version)) &&
(entry->uncompressed_size > 0) &&
((xattr & UNIX_FILETYPE_MASK) == UNIX_FILETYPE_SYMLINK) );
967
} /* zip_has_symlink_attr */
970
static PHYSFS_sint64 zip_dos_time_to_physfs_time(PHYSFS_uint32 dostime)
972
PHYSFS_uint32 dosdate;
973
974
struct tm unixtime;
memset(&unixtime, '\0', sizeof (unixtime));
976
977
dosdate = (PHYSFS_uint32) ((dostime >> 16) & 0xFFFF);
dostime &= 0xFFFF;
979
980
981
982
983
984
985
986
987
988
989
990
/* 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;
992
return ((PHYSFS_sint64) mktime(&unixtime));
993
} /* zip_dos_time_to_physfs_time */
994
995
996
static ZIPentry *zip_load_entry(ZIPinfo *info, const int zip64,
997
const PHYSFS_uint64 ofs_fixup)
999
PHYSFS_Io *io = info->io;
1000
ZIPentry entry;