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physfs/archivers/zip.c

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/*
* ZIP support routines for PhysicsFS.
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon, with some peeking at "unzip.c"
* by Gilles Vollant.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if (defined PHYSFS_SUPPORTS_ZIP)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include <errno.h>
#include "physfs.h"
#include "zlib.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
/*
* A buffer of ZIP_READBUFSIZE is malloc() for each compressed file opened,
* and is free()'d 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_BROKEN_FILE,
ZIP_BROKEN_SYMLINK,
} ZipResolveType;
/*
* One ZIPentry is kept for each file in an open ZIP archive.
*/
typedef struct _ZIPentry
{
char *name; /* Name of file in archive */
struct _ZIPentry *symlink; /* NULL or file we symlink to */
ZipResolveType resolved; /* Have we resolved file/symlink? */
PHYSFS_uint32 offset; /* offset of data in archive */
PHYSFS_uint16 version; /* version made by */
PHYSFS_uint16 version_needed; /* version needed to extract */
PHYSFS_uint16 compression_method; /* compression method */
PHYSFS_uint32 crc; /* crc-32 */
PHYSFS_uint32 compressed_size; /* compressed size */
PHYSFS_uint32 uncompressed_size; /* uncompressed size */
PHYSFS_sint64 last_mod_time; /* last file mod time */
} ZIPentry;
/*
* One ZIPinfo is kept for each open ZIP archive.
*/
typedef struct
{
char *archiveName; /* path to ZIP in platform-dependent notation. */
PHYSFS_uint16 entryCount; /* Number of files in ZIP. */
ZIPentry *entries; /* info on all files in ZIP. */
} ZIPinfo;
/*
* One ZIPfileinfo is kept for each open file in a ZIP archive.
*/
typedef struct
{
ZIPentry *entry; /* Info on file. */
void *handle; /* physical file handle. */
PHYSFS_uint32 compressed_position; /* offset in compressed data. */
PHYSFS_uint32 uncompressed_position; /* tell() position. */
PHYSFS_uint8 *buffer; /* decompression buffer. */
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
/* compression methods... */
#define COMPMETH_NONE 0
/* ...and others... */
#define UNIX_FILETYPE_MASK 0170000
#define UNIX_FILETYPE_SYMLINK 0120000
static PHYSFS_sint64 ZIP_read(FileHandle *handle, void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount);
static PHYSFS_sint64 ZIP_write(FileHandle *handle, const void *buffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount);
static int ZIP_eof(FileHandle *handle);
static PHYSFS_sint64 ZIP_tell(FileHandle *handle);
static int ZIP_seek(FileHandle *handle, PHYSFS_uint64 offset);
static PHYSFS_sint64 ZIP_fileLength(FileHandle *handle);
static int ZIP_fileClose(FileHandle *handle);
static int ZIP_isArchive(const char *filename, int forWriting);
static DirHandle *ZIP_openArchive(const char *name, int forWriting);
static LinkedStringList *ZIP_enumerateFiles(DirHandle *h,
const char *dirname,
int omitSymLinks);
static int ZIP_exists(DirHandle *h, const char *name);
static int ZIP_isDirectory(DirHandle *h, const char *name, int *fileExists);
static int ZIP_isSymLink(DirHandle *h, const char *name, int *fileExists);
static PHYSFS_sint64 ZIP_getLastModTime(DirHandle *h, const char *n, int *e);
static FileHandle *ZIP_openRead(DirHandle *h, const char *filename, int *e);
static FileHandle *ZIP_openWrite(DirHandle *h, const char *filename);
static FileHandle *ZIP_openAppend(DirHandle *h, const char *filename);
static void ZIP_dirClose(DirHandle *h);
static int zip_resolve(void *in, ZIPinfo *info, ZIPentry *entry);
static int ZIP_remove(DirHandle *h, const char *name);
static int ZIP_mkdir(DirHandle *h, const char *name);
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_ZIP =
{
"ZIP",
ZIP_ARCHIVE_DESCRIPTION,
"Ryan C. Gordon <icculus@clutteredmind.org>",
"http://icculus.org/physfs/",
};
static const FileFunctions __PHYSFS_FileFunctions_ZIP =
{
ZIP_read, /* read() method */
ZIP_write, /* write() method */
ZIP_eof, /* eof() method */
ZIP_tell, /* tell() method */
ZIP_seek, /* seek() method */
ZIP_fileLength, /* fileLength() method */
ZIP_fileClose /* fileClose() method */
};
const DirFunctions __PHYSFS_DirFunctions_ZIP =
{
&__PHYSFS_ArchiveInfo_ZIP,
ZIP_isArchive, /* isArchive() method */
ZIP_openArchive, /* openArchive() method */
ZIP_enumerateFiles, /* enumerateFiles() method */
ZIP_exists, /* exists() method */
ZIP_isDirectory, /* isDirectory() method */
ZIP_isSymLink, /* isSymLink() method */
ZIP_getLastModTime, /* getLastModTime() method */
ZIP_openRead, /* openRead() method */
ZIP_openWrite, /* openWrite() method */
ZIP_openAppend, /* openAppend() method */
ZIP_remove, /* remove() method */
ZIP_mkdir, /* mkdir() method */
ZIP_dirClose /* dirClose() method */
};
static const char *zlib_error_string(int rc)
{
switch (rc)
{
case Z_OK: return(NULL); /* not an error. */
case Z_STREAM_END: return(NULL); /* not an error. */
case Z_ERRNO: return(strerror(errno));
case Z_NEED_DICT: return(ERR_ZLIB_NEED_DICT);
case Z_DATA_ERROR: return(ERR_ZLIB_DATA_ERROR);
case Z_MEM_ERROR: return(ERR_ZLIB_MEMORY_ERROR);
case Z_BUF_ERROR: return(ERR_ZLIB_BUFFER_ERROR);
case Z_VERSION_ERROR: return(ERR_ZLIB_VERSION_ERROR);
default: return(ERR_ZLIB_UNKNOWN_ERROR);
} /* switch */
return(NULL);
} /* zlib_error_string */
/*
* Wrap all zlib calls in this, so the physfs error state is set appropriately.
*/
static int zlib_err(int rc)
{
const char *str = zlib_error_string(rc);
if (str != NULL)
__PHYSFS_setError(str);
return(rc);
} /* zlib_err */
/*
* Read an unsigned 32-bit int and swap to native byte order.
*/
static int readui32(void *in, PHYSFS_uint32 *val)
{
PHYSFS_uint32 v;
BAIL_IF_MACRO(__PHYSFS_platformRead(in, &v, sizeof (v), 1) != 1, NULL, 0);
*val = PHYSFS_swapULE32(v);
return(1);
} /* readui32 */
/*
* Read an unsigned 16-bit int and swap to native byte order.
*/
static int readui16(void *in, PHYSFS_uint16 *val)
{
PHYSFS_uint16 v;
BAIL_IF_MACRO(__PHYSFS_platformRead(in, &v, sizeof (v), 1) != 1, NULL, 0);
*val = PHYSFS_swapULE16(v);
return(1);
} /* readui16 */
static PHYSFS_sint64 ZIP_read(FileHandle *handle, void *buf,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
ZIPentry *entry = finfo->entry;
PHYSFS_sint64 retval = 0;
PHYSFS_sint64 maxread = ((PHYSFS_sint64) objSize) * objCount;
PHYSFS_sint64 avail = entry->uncompressed_size -
finfo->uncompressed_position;
BAIL_IF_MACRO(maxread == 0, NULL, 0); /* quick rejection. */
if (avail < maxread)
{
maxread = avail - (avail % objSize);
objCount = maxread / objSize;
BAIL_IF_MACRO(objCount == 0, ERR_PAST_EOF, 0); /* quick rejection. */
__PHYSFS_setError(ERR_PAST_EOF); /* this is always true here. */
} /* if */
if (entry->compression_method == COMPMETH_NONE)
{
retval = __PHYSFS_platformRead(finfo->handle, buf, objSize, objCount);
} /* if */
else
{
finfo->stream.next_out = buf;
finfo->stream.avail_out = objSize * objCount;
while (retval < maxread)
{
PHYSFS_uint32 before = 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 = __PHYSFS_platformRead(finfo->handle,
finfo->buffer,
1, br);
if (br <= 0)
break;
finfo->compressed_position += br;
finfo->stream.next_in = finfo->buffer;
finfo->stream.avail_in = br;
} /* if */
} /* if */
rc = zlib_err(inflate(&finfo->stream, Z_SYNC_FLUSH));
retval += (finfo->stream.total_out - before);
if (rc != Z_OK)
break;
} /* while */
retval /= objSize;
} /* else */
if (retval > 0)
finfo->uncompressed_position += (retval * objSize);
return(retval);
} /* ZIP_read */
static PHYSFS_sint64 ZIP_write(FileHandle *handle, const void *buf,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* ZIP_write */
static int ZIP_eof(FileHandle *handle)
{
ZIPfileinfo *finfo = ((ZIPfileinfo *) (handle->opaque));
return(finfo->uncompressed_position >= finfo->entry->uncompressed_size);
} /* ZIP_eof */
static PHYSFS_sint64 ZIP_tell(FileHandle *handle)
{
return(((ZIPfileinfo *) (handle->opaque))->uncompressed_position);
} /* ZIP_tell */
static int ZIP_seek(FileHandle *handle, PHYSFS_uint64 offset)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
ZIPentry *entry = finfo->entry;
void *in = finfo->handle;
BAIL_IF_MACRO(offset > entry->uncompressed_size, ERR_PAST_EOF, 0);
if (entry->compression_method == COMPMETH_NONE)
{
PHYSFS_sint64 newpos = offset + entry->offset;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, newpos), NULL, 0);
finfo->uncompressed_position = newpos;
} /* 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;
memset(&str, '\0', sizeof (z_stream));
if (zlib_err(inflateInit2(&str, -MAX_WBITS)) != Z_OK)
return(0);
if (!__PHYSFS_platformSeek(in, entry->offset))
return(0);
inflateEnd(&finfo->stream);
memcpy(&finfo->stream, &str, sizeof (z_stream));
finfo->uncompressed_position = finfo->compressed_position = 0;
} /* if */
while (finfo->uncompressed_position != offset)
{
PHYSFS_uint8 buf[512];
PHYSFS_uint32 maxread = offset - finfo->uncompressed_position;
if (maxread > sizeof (buf))
maxread = sizeof (buf);
if (ZIP_read(handle, buf, maxread, 1) != 1)
return(0);
} /* while */
} /* else */
return(1);
} /* ZIP_seek */
static PHYSFS_sint64 ZIP_fileLength(FileHandle *handle)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
return(finfo->entry->uncompressed_size);
} /* ZIP_fileLength */
static int ZIP_fileClose(FileHandle *handle)
{
ZIPfileinfo *finfo = (ZIPfileinfo *) (handle->opaque);
BAIL_IF_MACRO(!__PHYSFS_platformClose(finfo->handle), NULL, 0);
if (finfo->entry->compression_method != COMPMETH_NONE)
inflateEnd(&finfo->stream);
if (finfo->buffer != NULL)
free(finfo->buffer);
free(finfo);
free(handle);
return(1);
} /* ZIP_fileClose */
static PHYSFS_sint64 zip_find_end_of_central_dir(void *in, PHYSFS_sint64 *len)
{
PHYSFS_uint8 buf[256];
PHYSFS_sint32 i = 0;
PHYSFS_sint64 filelen;
PHYSFS_sint64 filepos;
PHYSFS_sint32 maxread;
PHYSFS_sint32 totalread = 0;
int found = 0;
PHYSFS_uint32 extra = 0;
filelen = __PHYSFS_platformFileLength(in);
BAIL_IF_MACRO(filelen == -1, NULL, 0);
/*
* 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 = filelen;
} /* else */
while ((totalread < filelen) && (totalread < 65557))
{
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, filepos), NULL, -1);
/* make sure we catch a signature between buffers. */
if (totalread != 0)
{
if (__PHYSFS_platformRead(in, buf, maxread - 4, 1) != 1)
return(-1);
*((PHYSFS_uint32 *) (&buf[maxread - 4])) = extra;
totalread += maxread - 4;
} /* if */
else
{
if (__PHYSFS_platformRead(in, buf, maxread, 1) != 1)
return(-1);
totalread += maxread;
} /* else */
extra = *((PHYSFS_uint32 *) (&buf[0]));
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);
} /* while */
BAIL_IF_MACRO(!found, ERR_NOT_AN_ARCHIVE, -1);
if (len != NULL)
*len = filelen;
return(filepos + i);
} /* zip_find_end_of_central_dir */
static int ZIP_isArchive(const char *filename, int forWriting)
{
PHYSFS_uint32 sig;
int retval = 0;
void *in;
in = __PHYSFS_platformOpenRead(filename);
BAIL_IF_MACRO(in == NULL, NULL, 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(in, &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(in, NULL) != -1);
} /* if */
} /* if */
__PHYSFS_platformClose(in);
return(retval);
} /* ZIP_isArchive */
static void zip_free_entries(ZIPentry *entries, PHYSFS_uint32 max)
{
PHYSFS_uint32 i;
for (i = 0; i < max; i++)
{
ZIPentry *entry = &entries[i];
if (entry->name != NULL)
free(entry->name);
} /* for */
free(entries);
} /* zip_free_entries */
static ZIPentry *zip_find_entry(ZIPinfo *info, const char *path)
{
ZIPentry *a = info->entries;
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
PHYSFS_sint32 middle;
int rc;
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
rc = strcmp(path, a[middle].name);
if (rc == 0) /* found it! */
return(&a[middle]);
else if (rc > 0)
lo = middle + 1;
else
hi = middle - 1;
} /* while */
BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* zip_find_entry */
/* Convert paths from old, buggy DOS zippers... */
static void zip_convert_dos_path(ZIPentry *entry, char *path)
{
PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((entry->version >> 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;
} /* else */
} /* while */
} /* zip_expand_symlink_path */
/*
* 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. (path) is always free()'d by this
* function.
*/
static ZIPentry *zip_follow_symlink(void *in, ZIPinfo *info, char *path)
{
ZIPentry *entry;
zip_expand_symlink_path(path);
entry = zip_find_entry(info, path);
if (entry != NULL)
{
if (!zip_resolve(in, info, entry)) /* recursive! */
entry = NULL;
else
{
if (entry->symlink != NULL)
entry = entry->symlink;
} /* else */
} /* if */
free(path);
return(entry);
} /* zip_follow_symlink */
static int zip_resolve_symlink(void *in, ZIPinfo *info, ZIPentry *entry)
{
char *path;
PHYSFS_uint32 size = entry->uncompressed_size;
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_MACRO(!__PHYSFS_platformSeek(in, entry->offset), NULL, 0);
path = (char *) malloc(size + 1);
BAIL_IF_MACRO(path == NULL, ERR_OUT_OF_MEMORY, 0);
if (entry->compression_method == COMPMETH_NONE)
rc = (__PHYSFS_platformRead(in, path, size, 1) == 1);
else /* symlink target path is compressed... */
{
z_stream stream;
PHYSFS_uint32 compsize = entry->compressed_size;
PHYSFS_uint8 *compressed = (PHYSFS_uint8 *) malloc(compsize);
if (compressed != NULL)
{
if (__PHYSFS_platformRead(in, compressed, compsize, 1) == 1)
{
memset(&stream, '\0', sizeof (z_stream));
stream.next_in = compressed;
stream.avail_in = compsize;
stream.next_out = path;
stream.avail_out = 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 */
free(compressed);
} /* if */
} /* else */
if (!rc)
free(path);
else
{
path[entry->uncompressed_size] = '\0'; /* null-terminate it. */
zip_convert_dos_path(entry, path);
entry->symlink = zip_follow_symlink(in, info, path);
} /* else */
return(entry->symlink != NULL);
} /* zip_resolve_symlink */
/*
* Parse the local file header of an entry, and update entry->offset.
*/
static int zip_parse_local(void *in, ZIPentry *entry)
{
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_uint16 fnamelen;
PHYSFS_uint16 extralen;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, entry->offset), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != ZIP_LOCAL_FILE_SIG, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != entry->version_needed, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* general bits. */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != entry->compression_method, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0); /* date/time */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != entry->crc, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != entry->compressed_size, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != entry->uncompressed_size, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(!readui16(in, &fnamelen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &extralen), NULL, 0);
entry->offset += fnamelen + extralen + 30;
return(1);
} /* zip_parse_local */
static int zip_resolve(void *in, ZIPinfo *info, ZIPentry *entry)
{
int retval = 1;
ZipResolveType resolve_type = entry->resolved;
/* Don't bother if we've failed to resolve this entry before. */
BAIL_IF_MACRO(resolve_type == ZIP_BROKEN_FILE, ERR_CORRUPTED, 0);
BAIL_IF_MACRO(resolve_type == ZIP_BROKEN_SYMLINK, ERR_CORRUPTED, 0);
/* uhoh...infinite symlink loop! */
BAIL_IF_MACRO(resolve_type == ZIP_RESOLVING, 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)
{
entry->resolved = ZIP_RESOLVING;
retval = zip_parse_local(in, 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(in, 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_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 int zip_entry_is_symlink(ZIPentry *entry)
{
return((entry->resolved == ZIP_UNRESOLVED_SYMLINK) ||
(entry->resolved == ZIP_BROKEN_SYMLINK) ||
(entry->symlink));
} /* zip_entry_is_symlink */
static int zip_has_symlink_attr(ZIPentry *entry, 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 */
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 int zip_load_entry(void *in, ZIPentry *entry, PHYSFS_uint32 ofs_fixup)
{
PHYSFS_uint16 fnamelen, extralen, commentlen;
PHYSFS_uint32 external_attr;
PHYSFS_uint16 ui16;
PHYSFS_uint32 ui32;
PHYSFS_sint64 si64;
/* sanity check with central directory signature... */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != ZIP_CENTRAL_DIR_SIG, ERR_CORRUPTED, 0);
/* Get the pertinent parts of the record... */
BAIL_IF_MACRO(!readui16(in, &entry->version), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &entry->version_needed), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* general bits */
BAIL_IF_MACRO(!readui16(in, &entry->compression_method), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
entry->last_mod_time = zip_dos_time_to_physfs_time(ui32);
BAIL_IF_MACRO(!readui32(in, &entry->crc), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &entry->compressed_size), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &entry->uncompressed_size), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &fnamelen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &extralen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &commentlen), NULL, 0);
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* disk number start */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0); /* internal file attribs */
BAIL_IF_MACRO(!readui32(in, &external_attr), NULL, 0);
BAIL_IF_MACRO(!readui32(in, &entry->offset), NULL, 0);
entry->offset += ofs_fixup;
entry->symlink = NULL; /* will be resolved later, if necessary. */
entry->resolved = (zip_has_symlink_attr(entry, external_attr)) ?
ZIP_UNRESOLVED_SYMLINK : ZIP_UNRESOLVED_FILE;
entry->name = (char *) malloc(fnamelen + 1);
BAIL_IF_MACRO(entry->name == NULL, ERR_OUT_OF_MEMORY, 0);
if (__PHYSFS_platformRead(in, entry->name, fnamelen, 1) != 1)
goto zip_load_entry_puked;
entry->name[fnamelen] = '\0'; /* null-terminate the filename. */
zip_convert_dos_path(entry, entry->name);
si64 = __PHYSFS_platformTell(in);
if (si64 == -1)
goto zip_load_entry_puked;
/* seek to the start of the next entry in the central directory... */
if (!__PHYSFS_platformSeek(in, si64 + extralen + commentlen))
goto zip_load_entry_puked;
return(1); /* success. */
zip_load_entry_puked:
free(entry->name);
return(0); /* failure. */
} /* zip_load_entry */
static int zip_entry_cmp(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
ZIPentry *a = (ZIPentry *) _a;
return(strcmp(a[one].name, a[two].name));
} /* zip_entry_cmp */
static void zip_entry_swap(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
ZIPentry tmp;
ZIPentry *first = &(((ZIPentry *) _a)[one]);
ZIPentry *second = &(((ZIPentry *) _a)[two]);
memcpy(&tmp, first, sizeof (ZIPentry));
memcpy(first, second, sizeof (ZIPentry));
memcpy(second, &tmp, sizeof (ZIPentry));
} /* zip_entry_swap */
static int zip_load_entries(void *in, DirHandle *dirh,
PHYSFS_uint32 data_ofs, PHYSFS_uint32 central_ofs)
{
ZIPinfo *info = (ZIPinfo *) dirh->opaque;
PHYSFS_uint32 max = info->entryCount;
PHYSFS_uint32 i;
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, central_ofs), NULL, 0);
info->entries = (ZIPentry *) malloc(sizeof (ZIPentry) * max);
BAIL_IF_MACRO(info->entries == NULL, ERR_OUT_OF_MEMORY, 0);
for (i = 0; i < max; i++)
{
if (!zip_load_entry(in, &info->entries[i], data_ofs))
{
zip_free_entries(info->entries, i);
return(0);
} /* if */
} /* for */
__PHYSFS_sort(info->entries, max, zip_entry_cmp, zip_entry_swap);
return(1);
} /* zip_load_entries */
static int zip_parse_end_of_central_dir(void *in, DirHandle *dirh,
PHYSFS_uint32 *data_start,
PHYSFS_uint32 *central_dir_ofs)
{
ZIPinfo *zipinfo = (ZIPinfo *) dirh->opaque;
PHYSFS_uint32 ui32;
PHYSFS_uint16 ui16;
PHYSFS_sint64 len;
PHYSFS_sint64 pos;
/* find the end-of-central-dir record, and seek to it. */
pos = zip_find_end_of_central_dir(in, &len);
BAIL_IF_MACRO(pos == -1, NULL, 0);
BAIL_IF_MACRO(!__PHYSFS_platformSeek(in, pos), NULL, 0);
/* check signature again, just in case. */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
BAIL_IF_MACRO(ui32 != ZIP_END_OF_CENTRAL_DIR_SIG, ERR_NOT_AN_ARCHIVE, 0);
/* number of this disk */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != 0, ERR_UNSUPPORTED_ARCHIVE, 0);
/* number of the disk with the start of the central directory */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
BAIL_IF_MACRO(ui16 != 0, ERR_UNSUPPORTED_ARCHIVE, 0);
/* total number of entries in the central dir on this disk */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 0);
/* total number of entries in the central dir */
BAIL_IF_MACRO(!readui16(in, &zipinfo->entryCount), NULL, 0);
BAIL_IF_MACRO(ui16 != zipinfo->entryCount, ERR_UNSUPPORTED_ARCHIVE, 0);
/* size of the central directory */
BAIL_IF_MACRO(!readui32(in, &ui32), NULL, 0);
/* offset of central directory */
BAIL_IF_MACRO(!readui32(in, central_dir_ofs), NULL, 0);
BAIL_IF_MACRO(pos < *central_dir_ofs + ui32, ERR_UNSUPPORTED_ARCHIVE, 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 = pos - (*central_dir_ofs + ui32);
/* Now that we know the difference, fix up the central dir offset... */
*central_dir_ofs += *data_start;
/* zipfile comment length */
BAIL_IF_MACRO(!readui16(in, &ui16), NULL, 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_MACRO((pos + 22 + ui16) != len, ERR_UNSUPPORTED_ARCHIVE, 0);
return(1); /* made it. */
} /* zip_parse_end_of_central_dir */
static DirHandle *zip_allocate_dirhandle(const char *name)
{
char *ptr;
ZIPinfo *info;
DirHandle *retval = malloc(sizeof (DirHandle));
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
memset(retval, '\0', sizeof (DirHandle));
info = (ZIPinfo *) malloc(sizeof (ZIPinfo));
if (info == NULL)
{
free(retval);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
memset(info, '\0', sizeof (ZIPinfo));
ptr = (char *) malloc(strlen(name) + 1);
if (ptr == NULL)
{
free(info);
free(retval);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
info->archiveName = ptr;
strcpy(info->archiveName, name);
retval->opaque = info;
retval->funcs = &__PHYSFS_DirFunctions_ZIP;
return(retval);
} /* zip_allocate_dirhandle */
static DirHandle *ZIP_openArchive(const char *name, int forWriting)
{
DirHandle *retval = NULL;
void *in = NULL;
PHYSFS_uint32 data_start;
PHYSFS_uint32 cent_dir_ofs;
int success = 0;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, NULL);
if ((in = __PHYSFS_platformOpenRead(name)) == NULL)
goto zip_openarchive_end;
if ((retval = zip_allocate_dirhandle(name)) == NULL)
goto zip_openarchive_end;
if (!zip_parse_end_of_central_dir(in, retval, &data_start, &cent_dir_ofs))
goto zip_openarchive_end;
if (!zip_load_entries(in, retval, data_start, cent_dir_ofs))
goto zip_openarchive_end;
success = 1; /* ...and we're good to go. :) */
zip_openarchive_end:
if (!success) /* clean up for failures. */
{
if (retval != NULL)
{
if (retval->opaque != NULL)
{
if (((ZIPinfo *) (retval->opaque))->archiveName != NULL)
free(((ZIPinfo *) (retval->opaque))->archiveName);
free(retval->opaque);
} /* if */
free(retval);
retval = NULL;
} /* if */
} /* if */
if (in != NULL)
__PHYSFS_platformClose(in); /* Close this even with success. */
return(retval);
} /* ZIP_openArchive */
static PHYSFS_sint32 zip_find_start_of_dir(ZIPinfo *info, const char *path,
int stop_on_first_find)
{
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) info->entryCount;
PHYSFS_sint32 middle;
PHYSFS_uint32 dlen = strlen(path);
PHYSFS_sint32 retval = -1;
const char *name;
int rc;
if (*path == '\0') /* root dir? */
return(0);
if ((dlen > 0) && (path[dlen - 1] == '/')) /* ignore trailing slash. */
dlen--;
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
name = info->entries[middle].name;
rc = strncmp(path, name, dlen);
if (rc == 0)
{
char ch = name[dlen];
if (ch < '/') /* make sure this isn't just a substr match. */
rc = -1;
else if (ch > '/')
rc = 1;
else
{
if (stop_on_first_find) /* Just checking dir's existance? */
return(middle);
if (name[dlen + 1] == '\0') /* Skip initial dir entry. */
return(middle + 1);
/* there might be more entries earlier in the list. */
retval = middle;
hi = middle - 1;
} /* else */
} /* if */
if (rc > 0)
lo = middle + 1;
else
hi = middle - 1;
} /* while */
return(retval);
} /* zip_find_start_of_dir */
static LinkedStringList *ZIP_enumerateFiles(DirHandle *h,
const char *dirname,
int omitSymLinks)
{
ZIPinfo *info = ((ZIPinfo *) h->opaque);
LinkedStringList *retval = NULL, *p = NULL;
PHYSFS_sint32 dlen, dlen_inc, max, i;
i = zip_find_start_of_dir(info, dirname, 0);
BAIL_IF_MACRO(i == -1, ERR_NO_SUCH_FILE, NULL);
dlen = strlen(dirname);
if ((dlen > 0) && (dirname[dlen - 1] == '/')) /* ignore trailing slash. */
dlen--;
dlen_inc = ((dlen > 0) ? 1 : 0) + dlen;
max = (PHYSFS_sint32) info->entryCount;
while (i < max)
{
char *e = info->entries[i].name;
if ((dlen) && ((strncmp(e, dirname, dlen) != 0) || (e[dlen] != '/')))
break; /* past end of this dir; we're done. */
if ((omitSymLinks) && (zip_entry_is_symlink(&info->entries[i])))
i++;
else
{
char *add = e + dlen_inc;
char *ptr = strchr(add, '/');
PHYSFS_sint32 ln = (PHYSFS_sint32) ((ptr) ? ptr-add : strlen(add));
retval = __PHYSFS_addToLinkedStringList(retval, &p, add, ln);
ln += dlen_inc; /* point past entry to children... */
/* increment counter and skip children of subdirs... */
while ((++i < max) && (ptr != NULL))
{
char *e_new = info->entries[i].name;
if ((strncmp(e, e_new, ln) != 0) || (e_new[ln] != '/'))
break;
} /* while */
} /* else */
} /* while */
return(retval);
} /* ZIP_enumerateFiles */
static int ZIP_exists(DirHandle *h, const char *name)
{
ZIPinfo *info = (ZIPinfo *) h->opaque;
int retval = (zip_find_entry(info, name) != NULL);
/* !!! FIXME: this would be faster the other way, I think: dirs first. */
if (!retval) /* might be a directory... */
retval = (zip_find_start_of_dir(info, name, 1) != -1);
return(retval);
} /* ZIP_exists */
static PHYSFS_sint64 ZIP_getLastModTime(DirHandle *h,
const char *name,
int *fileExists)
{
ZIPentry *entry = zip_find_entry((ZIPinfo *) h->opaque, name);
*fileExists = (entry != NULL);
/* !!! FIXME: Fails for directories. */
BAIL_IF_MACRO(entry == NULL, NULL, -1);
return(entry->last_mod_time);
} /* ZIP_getLastModTime */
static int ZIP_isDirectory(DirHandle *h, const char *name, int *fileExists)
{
ZIPinfo *info = (ZIPinfo *) h->opaque;
PHYSFS_sint32 pos;
ZIPentry *entry;
pos = zip_find_start_of_dir(info, name, 1);
if (pos >= 0)
{
*fileExists = 1;
return(1); /* definitely a dir. */
} /* if */
/* Follow symlinks. This means we might need to resolve entries. */
entry = zip_find_entry(info, name);
*fileExists = (entry != NULL);
BAIL_IF_MACRO(entry == NULL, ERR_NO_SUCH_FILE, 0);
if (entry->resolved == ZIP_UNRESOLVED_SYMLINK) /* gotta resolve it. */
{
int rc;
void *in = __PHYSFS_platformOpenRead(info->archiveName);
BAIL_IF_MACRO(in == NULL, NULL, 0);
rc = zip_resolve(in, info, entry);
__PHYSFS_platformClose(in);
if (!rc)
return(0);
} /* if */
BAIL_IF_MACRO(entry->resolved == ZIP_BROKEN_SYMLINK, NULL, 0);
BAIL_IF_MACRO(entry->symlink == NULL, ERR_NOT_A_DIR, 0);
return(zip_find_start_of_dir(info, entry->symlink->name, 1) >= 0);
} /* ZIP_isDirectory */
static int ZIP_isSymLink(DirHandle *h, const char *name, int *fileExists)
{
ZIPentry *entry = zip_find_entry((ZIPinfo *) h->opaque, name);
*fileExists = (entry != NULL);
BAIL_IF_MACRO(entry == NULL, NULL, 0);
return(zip_entry_is_symlink(entry));
} /* ZIP_isSymLink */
static void *zip_get_file_handle(const char *fn, ZIPinfo *inf, ZIPentry *entry)
{
int success;
void *retval = __PHYSFS_platformOpenRead(fn);
BAIL_IF_MACRO(retval == NULL, NULL, NULL);
success = zip_resolve(retval, inf, entry);
if (success)
{
PHYSFS_sint64 offset;
offset = ((entry->symlink) ? entry->symlink->offset : entry->offset);
success = __PHYSFS_platformSeek(retval, offset);
} /* if */
if (!success)
{
__PHYSFS_platformClose(retval);
retval = NULL;
} /* if */
return(retval);
} /* zip_get_file_handle */
static FileHandle *ZIP_openRead(DirHandle *h, const char *fnm, int *fileExists)
{
ZIPinfo *info = (ZIPinfo *) h->opaque;
ZIPentry *entry = zip_find_entry(info, fnm);
FileHandle *retval = NULL;
ZIPfileinfo *finfo = NULL;
void *in;
*fileExists = (entry != NULL);
BAIL_IF_MACRO(entry == NULL, NULL, NULL);
in = zip_get_file_handle(info->archiveName, info, entry);
BAIL_IF_MACRO(in == NULL, NULL, NULL);
if ( ((retval = (FileHandle *) malloc(sizeof (FileHandle))) == NULL) ||
((finfo = (ZIPfileinfo *) malloc(sizeof (ZIPfileinfo))) == NULL) )
{
if (retval)
free(retval);
__PHYSFS_platformClose(in);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
retval->opaque = (void *) finfo;
retval->funcs = &__PHYSFS_FileFunctions_ZIP;
retval->dirHandle = h;
memset(finfo, '\0', sizeof (ZIPfileinfo));
finfo->handle = in;
finfo->entry = ((entry->symlink != NULL) ? entry->symlink : entry);
if (finfo->entry->compression_method != COMPMETH_NONE)
{
if (zlib_err(inflateInit2(&finfo->stream, -MAX_WBITS)) != Z_OK)
{
ZIP_fileClose(retval);
return(NULL);
} /* if */
finfo->buffer = (PHYSFS_uint8 *) malloc(ZIP_READBUFSIZE);
if (finfo->buffer == NULL)
{
ZIP_fileClose(retval);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
} /* if */
return(retval);
} /* ZIP_openRead */
static FileHandle *ZIP_openWrite(DirHandle *h, const char *filename)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* ZIP_openWrite */
static FileHandle *ZIP_openAppend(DirHandle *h, const char *filename)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* ZIP_openAppend */
static void ZIP_dirClose(DirHandle *h)
{
ZIPinfo *zi = (ZIPinfo *) (h->opaque);
zip_free_entries(zi->entries, zi->entryCount);
free(zi->archiveName);
free(zi);
free(h);
} /* ZIP_dirClose */
static int ZIP_remove(DirHandle *h, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* ZIP_remove */
static int ZIP_mkdir(DirHandle *h, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* ZIP_mkdir */
#endif /* defined PHYSFS_SUPPORTS_ZIP */
/* end of zip.c ... */
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