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ClamAV is an open source (GPLv2) anti-virus toolkit.
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clamav/clamav-devel/libclamav/zziplib/zzip-file.c

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/*
* Author:
* Guido Draheim <guidod@gmx.de>
* Tomi Ollila <Tomi.Ollila@iki.fi>
*
* Copyright (c) 1999,2000,2001,2002 Guido Draheim
* All rights reserved,
* use under the restrictions of the
* Lesser GNU General Public License
* note the additional license information
* that can be found in COPYING.ZZIP
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <zzip.h> /* exported...*/
#include <zzip-file.h>
#include "strc.h"
#include <sys/types.h> /* njh@bandsman.co.uk: for icc7.0 */
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>
#include <zzipformat.h>
/*
#include "__debug.h"
*/
#if 0
# if defined ZZIP_HAVE_IO_H
# include <io.h> /* tell */
# else
# define tell(fd) lseek(fd,0,SEEK_CUR)
# endif
#else
#define tells(fd) seeks(fd,0,SEEK_CUR)
#endif
/**
* the direct function of => zzip_close(fp). it will cleanup the
* inflate-portion of => zlib and free the structure given.
*
* it is called quite from the error-cleanup parts
* of the various => _open functions.
*
* the .refcount is decreased and if zero the fp->dir is closed just as well.
*/
int
zzip_file_close(ZZIP_FILE * fp)
{
ZZIP_DIR * dir = fp->dir;
if (fp->method)
inflateEnd(&fp->d_stream); /* inflateEnd() can be called many times */
if (fp->buf32k)
{
if (dir->cache.buf32k == NULL) dir->cache.buf32k = fp->buf32k;
else free(fp->buf32k);
}
if (dir->currentfp == fp)
dir->currentfp = NULL;
dir->refcount--;
/* ease to notice possible dangling reference errors */
memset(fp, 0, sizeof(*fp));
if (dir->cache.fp == NULL) dir->cache.fp = fp;
else free(fp);
if (! dir->refcount) return zzip_dir_close(dir); else return 0;
}
static int
zzip_file_saveoffset(ZZIP_FILE * fp)
{
if (fp)
{
int fd = fp->dir->fd;
zzip_off_t off = fp->io->seeks(fd, 0, SEEK_CUR);
if (off < 0)
return -1;
fp->offset = off;
}
return 0;
}
# if !defined strcasecmp && !defined ZZIP_HAVE_STRCASECMP
# define ZZIP_CHECK_BACKSLASH_DIRSEPARATOR 1
# else
# ifndef ZZIP_CHECK_BACKSLASH_DIRSEPARATOR /* NOTE: also default */
# define ZZIP_CHECK_BACKSLASH_DIRSEPARATOR 0 /* to "NO" on win32 ! */
# endif
# endif
#if ! ZZIP_CHECK_BACKSLASH_DIRSEPARATOR+0
#define dirsep_strrchr(N,C) strrchr(N,C)
#define dirsep_casecmp strcasecmp
#else
#define dirsep_strrchr(N,C) _dirsep_strrchr(N)
#define dirsep_casecmp _dirsep_casecmp
static zzip_char_t*
_dirsep_strrchr (zzip_char_t* name)
{
char* n = strrchr (name, '/');
char* m = strrchr (name, '\\');
if (m && n && m > n) n = m;
return n;
}
static int
_dirsep_casecmp (zzip_char_t* s1, zzip_char_t* s2)
{
/* ASCII tolower - including mapping of backslash in normal slash */
static const char mapping[] = "@abcdefghijklmnopqrstuvwxyz[/]^_";
int c1, c2;
while (*s1 && *s2)
{
c1 = (int)(unsigned char) *s1;
c2 = (int)(unsigned char) *s2;
if ((c1&0xE0) == 0x40) c1 = mapping[c1&0x1f];
if ((c1&0xE0) == 0x40) c2 = mapping[c2&0x1f];
if (c1 != c2)
return (c1 - c2);
s1++; s2++;
}
return (((int)(unsigned char) *s1) - ((int)(unsigned char) *s2));
}
#endif
static int zzip_inflate_init(ZZIP_FILE *, struct zzip_dir_hdr *);
/**
* open an => ZZIP_FILE from an already open => ZZIP_DIR handle. Since
* we have a chance to reuse a cached => buf32k and => ZZIP_FILE memchunk
* this is the best choice to unpack multiple files.
*
* Note: the zlib supports 2..15 bit windowsize, hence we provide a 32k
* memchunk here... just to be safe.
*/
ZZIP_FILE *
zzip_file_open(ZZIP_DIR * dir, zzip_char_t* name, int o_mode)
{
zzip_error_t err = 0;
struct zzip_file * fp = 0;
struct zzip_dir_hdr * hdr = dir->hdr0;
int (*cmp)(zzip_char_t*, zzip_char_t*);
cmp = (o_mode & ZZIP_CASELESS)? dirsep_casecmp: strcmp;
if (! dir || !dir->fd || dir->fd == -1 ) return 0;
if (o_mode & ZZIP_NOPATHS)
{
register zzip_char_t* n = dirsep_strrchr(name, '/');
if (n) name = n + 1;
}
if (hdr)
while (1)
{
register zzip_char_t* hdr_name = hdr->d_name;
if (o_mode & ZZIP_NOPATHS)
{
register zzip_char_t* n = dirsep_strrchr(hdr_name, '/');
if (n) hdr_name = n + 1;
}
/*
HINT4("name='%s', compr=%d, size=%d\n",
hdr->d_name, hdr->d_compr, hdr->d_usize);
*/
if (!cmp(hdr_name, name))
{
switch (hdr->d_compr)
{
case 0: /* store */
case 8: /* inflate */
break;
default:
{ err = ZZIP_UNSUPP_COMPR; goto error; }
}
if (dir->cache.fp)
{
fp = dir->cache.fp; dir->cache.fp = NULL;
/* memset(zfp, 0, sizeof *fp); cleared in zzip_file_close() */
}else
{
if (! (fp = (ZZIP_FILE *)calloc(1, sizeof(*fp))))
{ err = ZZIP_OUTOFMEM; goto error; }
}
fp->dir = dir;
fp->io = dir->io;
dir->refcount++;
if (dir->cache.buf32k)
{ fp->buf32k = dir->cache.buf32k; dir->cache.buf32k = NULL; }
else
{
if (! (fp->buf32k = (char *)malloc(ZZIP_32K)))
{ err = ZZIP_OUTOFMEM; goto error; }
}
/*
* In order to support simultaneous open files in one zip archive
* we'll fix the fd offset when opening new file/changing which
* file to read...
*/
if (zzip_file_saveoffset(dir->currentfp) < 0)
{ err = ZZIP_DIR_SEEK; goto error; }
fp->offset = hdr->d_off;
dir->currentfp = fp;
if (dir->io->seeks(dir->fd, hdr->d_off, SEEK_SET) < 0)
{ err = ZZIP_DIR_SEEK; goto error; }
{ /* skip local header - should test tons of other info,
* but trust that those are correct */
zzip_ssize_t dataoff;
struct zzip_file_header * p = (void*) fp->buf32k;
dataoff = dir->io->read(dir->fd, (void*)p, sizeof(*p));
if (dataoff < (zzip_ssize_t)sizeof(*p))
{ err = ZZIP_DIR_READ; goto error; }
if (! ZZIP_FILE_HEADER_CHECKMAGIC(p)) /* PK\3\4 */
{ err = ZZIP_CORRUPTED; goto error; }
dataoff = ZZIP_GET16(p->z_namlen) + ZZIP_GET16(p->z_extras);
if (dir->io->seeks(dir->fd, dataoff, SEEK_CUR) < 0)
{ err = ZZIP_DIR_SEEK; goto error; }
fp->dataoffset = dir->io->tells(dir->fd);
fp->usize = hdr->d_usize;
fp->csize = hdr->d_csize;
}
err = zzip_inflate_init (fp, hdr);
if (err) { goto error; }
return fp;
}else
{
if (hdr->d_reclen == 0)
break;
hdr = (struct zzip_dir_hdr *)((char *)hdr + hdr->d_reclen);
}/*cmp name*/
}/*forever*/
dir->errcode = ZZIP_ENOENT; zzip_errno(ZZIP_ENOENT);
return NULL;
error:
if (fp) zzip_file_close(fp);
dir->errcode = err; zzip_errno(err);
return NULL;
}
/**
* call => inflateInit and setup fp's iterator variables,
* used by lowlevel => _open functions.
*/
static int
zzip_inflate_init(ZZIP_FILE * fp, struct zzip_dir_hdr* hdr)
{
int err;
fp->method = hdr->d_compr;
fp->restlen = hdr->d_usize;
if (fp->method)
{
memset(&fp->d_stream, 0, sizeof(fp->d_stream));
err = inflateInit2(&fp->d_stream, -MAX_WBITS);
if (err != Z_OK) { goto error; }
fp->crestlen = hdr->d_csize;
}
return 0;
error:
if (fp) zzip_file_close(fp);
return err;
}
/**
* This function closes the given ZZIP_FILE handle.
*
* If the ZZIP_FILE wraps a normal stat'fd then it is just that int'fd
* that is being closed and the otherwise empty ZZIP_FILE gets freed.
*/
int
zzip_fclose(ZZIP_FILE * fp)
{
if (! fp) return 0;
if (! fp->dir)
{ int r = fp->io->close(fp->fd); free(fp); return r; } /* stat fd */
else return zzip_file_close(fp);
}
/** => zzip_fclose
*/
int
zzip_close(ZZIP_FILE* fp)
{
return zzip_fclose (fp);
}
/**
* This functions read data from zip-contained file.
*
* It works like => read(2) and will fill the given buffer with bytes from
* the opened file. It will return the number of bytes read, so if the => EOF
* is encountered you will be prompted with the number of bytes actually read.
*
* This is the routines that needs the => buf32k buffer, and it would have
* need for much more polishing but it does already work quite well.
*
* Note: the 32K buffer is rather big. The original inflate-algorithm
* required just that but the latest zlib would work just fine with
* a smaller buffer.
*/
zzip_ssize_t
zzip_file_read(ZZIP_FILE * fp, char * buf, zzip_size_t len)
{
ZZIP_DIR * dir;
zzip_size_t l;
zzip_ssize_t rv;
if (! fp || ! fp->dir) return 0;
dir = fp->dir;
l = fp->restlen > len ? len : fp->restlen;
if (fp->restlen == 0)
return 0;
/*
* If this is other handle than previous, save current seek pointer
* and read the file position of `this' handle.
*/
if (dir->currentfp != fp)
{
if (zzip_file_saveoffset(dir->currentfp) < 0
|| fp->io->seeks(dir->fd, fp->offset, SEEK_SET) < 0)
{ dir->errcode = ZZIP_DIR_SEEK; return -1; }
else
{ dir->currentfp = fp; }
}
/* if more methods is to be supported, change this to `switch ()' */
if (fp->method) /* method != 0 == 8, inflate */
{
fp->d_stream.avail_out = l;
fp->d_stream.next_out = (unsigned char *)buf;
do {
int err;
zzip_size_t startlen;
if (fp->crestlen > 0 && fp->d_stream.avail_in == 0)
{
zzip_size_t cl = ( fp->crestlen < ZZIP_32K ?
fp->crestlen : ZZIP_32K );
/* zzip_size_t cl = fp->crestlen > 128 ? 128 : fp->crestlen; */
zzip_ssize_t i = fp->io->read(dir->fd, fp->buf32k, cl);
if (i <= 0)
{
dir->errcode = ZZIP_DIR_READ; /* or ZZIP_DIR_READ_EOF ? */
return -1;
}
fp->crestlen -= i;
fp->d_stream.avail_in = i;
fp->d_stream.next_in = (unsigned char *)fp->buf32k;
}
startlen = fp->d_stream.total_out;
err = inflate(&fp->d_stream, Z_NO_FLUSH);
if (err == Z_STREAM_END)
{ fp->restlen = 0; }
else
if (err == Z_OK)
{ fp->restlen -= (fp->d_stream.total_out - startlen); }
else
{ dir->errcode = err; return -1; }
} while (fp->restlen && fp->d_stream.avail_out);
return l - fp->d_stream.avail_out;
}else
{ /* method == 0 -- unstore */
rv = fp->io->read(dir->fd, buf, l);
if (rv > 0)
{ fp->restlen-= rv; }
else
if (rv < 0)
{ dir->errcode = ZZIP_DIR_READ; }
return rv;
}
}
/**
* This function will read(2) data from a real/zipped file.
*
* the replacement for => read(2) will fill the given buffer with bytes from
* the opened file. It will return the number of bytes read, so if the EOF
* is encountered you will be prompted with the number of bytes actually read.
*
* If the file-handle is wrapping a stat'able file then it will actually just
* perform a normal => read(2)-call, otherwise => zzip_file_read is called
* to decompress the data stream and any error is mapped to => errno(3).
*/
zzip_ssize_t
zzip_read(ZZIP_FILE * fp, char * buf, zzip_size_t len)
{
if (! fp) return 0;
if (! fp->dir)
{ return fp->io->read(fp->fd, buf, len); } /* stat fd */
else
{ register zzip_ssize_t v;
v = zzip_file_read(fp, buf, len);
if (v == -1) { errno = zzip_errno(fp->dir->errcode); }
return v;
}
}
/** => zzip_read
*/
zzip_size_t
zzip_fread(void *ptr, zzip_size_t size, zzip_size_t nmemb, ZZIP_FILE *file)
{
if (! size) size=1;
return zzip_read (file, ptr, size*nmemb)/size;
}
#define ZZIP_WRONLY O_WRONLY
#define ZZIP_EXCL O_EXCL
#if defined O_SYNC
#define ZZIP_SYNC O_SYNC
#else
#define ZZIP_SYNC 0
#endif
#if defined O_NONBLOCK
#define ZZIP_NONBLOCK O_NONBLOCK
#elif defined O_NDELAY
#define ZZIP_NOCTTY O_NDELAY
#else
#define ZZIP_NOCTTY 0
#endif
/* ------------------------------------------------------------------- */
/**
* This function will => fopen(3) a real/zipped file.
*
* It has some magic functionality builtin - it will first try to open
* the given <em>filename</em> as a normal file. If it does not
* exist, the given path to the filename (if any) is split into
* its directory-part and the file-part. A ".zip" extension is
* then added to the directory-part to create the name of a
* zip-archive. That zip-archive (if it exists) is being searched
* for the file-part, and if found a zzip-handle is returned.
*
* Note that if the file is found in the normal fs-directory the
* returned structure is mostly empty and the => zzip_read call will
* use the libc => read to obtain data. Otherwise a => zzip_file_open
* is performed and any error mapped to => errno(3).
*
* unlike the posix-wrapper => zzip_open the mode-argument is
* a string which allows for more freedom to support the extra
* zzip modes called ZZIP_CASEINSENSITIVE and ZZIP_IGNOREPATH.
* Currently, this => zzip_fopen call will convert the following
* characters in the mode-string into their corrsponding mode-bits:
* <ul><li><code> "r" : O_RDONLY : </code> read-only
* </li><li><code> "b" : O_BINARY : </code> binary (win32 specific)
* </li><li><code> "f" : O_NOCTTY : </code> no char device (unix)
* </li><li><code> "i" : ZZIP_CASELESS : </code> inside zip file
* </li><li><code> "*" : ZZIP_NOPATHS : </code> inside zip file only
* </ul> all other modes will be ignored for zip-contained entries
* but they are transferred for compatibility and portability,
* including these extra sugar bits:
* <ul><li><code> "x" : O_EXCL :</code> fail if file did exist
* </li><li><code> "s" : O_SYNC :</code> synchronized access
* </li><li><code> "n" : O_NONBLOCK :</code> nonblocking access
* </li><li><code> "z#" : compression level :</code> for zlib
* </li><li><code> "g#" : group access :</code> unix access bits
* </li><li><code> "u#" : owner access :</code> unix access bits
* </li><li><code> "o#" : world access :</code> unix access bits
* </ul>... the access bits are in traditional unix bit format
* with 7 = read/write/execute, 6 = read/write, 4 = read-only.
*
* The default access mode is 0664, and the compression level
* is ignored since the lib can not yet write zip files, otherwise
* it would be the initialisation value for the zlib deflateInit
* where 0 = no-compression, 1 = best-speed, 9 = best-compression.
*/
ZZIP_FILE*
zzip_fopen(zzip_char_t* filename, zzip_char_t* mode)
{
return zzip_freopen (filename, mode, 0);
}
/** => zzip_fopen
*
* This function receives an additional argument pointing to
* a ZZIP_FILE* being already in use. If this extra argument is
* null then this function is identical with calling => zzip_fopen
*
* Per default, the old file stream is closed and only the internal
* structures associated with it are kept. These internal structures
* may be reused for the return value, and this is a lot quicker when
* the filename matches a zipped file that is incidently in the very
* same zip arch as the old filename wrapped in the stream struct.
*
* That's simply because the zip arch's central directory does not
* need to be read again. As an extension for this function, if the
* mode-string contains a "q" then the old stream is not closed but
* left untouched, instead it is only given as a hint that a new
* file handle may share/copy the zip arch structures of the old file
* handle if that is possible, i.e when they are in the same zip arch.
*/
ZZIP_FILE*
zzip_freopen(zzip_char_t* filename, zzip_char_t* mode, ZZIP_FILE* stream)
{
int o_flags = 0;
int o_modes = 0664;
if (!mode) mode = "rb";
# ifndef O_BINARY
# define O_BINARY 0
# endif
# ifndef O_NOCTTY
# define O_NOCTTY 0
# endif
# ifndef O_SYNC
# define O_SYNC 0
# endif
# ifndef O_NONBLOCK
# define O_NONBLOCK 0
# endif
for(; *mode; mode++)
{
switch (*mode)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
continue; /* ignore if not attached to other info */
case 'r': o_flags |= mode[1] == '+' ? O_RDWR : O_RDONLY; break;
case 'w': o_flags |= mode[1] == '+' ? O_RDWR : O_WRONLY;
o_flags |= O_TRUNC; break;
case 'b': o_flags |= O_BINARY; break;
case 'f': o_flags |= O_NOCTTY; break;
case 'i': o_modes |= ZZIP_CASELESS; break;
case '*': o_modes |= ZZIP_NOPATHS; break;
case 'x': o_flags |= O_EXCL; break;
case 's': o_flags |= O_SYNC; break;
case 'n': o_flags |= O_NONBLOCK; break;
case 'o': o_modes &=~ 07;
o_modes |= ((mode[1] - '0'))&07; continue;
case 'g': o_modes &=~ 070;
o_modes |= ((mode[1] - '0')<<3)&070; continue;
case 'u': o_modes &=~ 0700;
o_modes |= ((mode[1] - '0')<<6)&0700; continue;
case 'q': o_modes |= ZZIP_FACTORY; break;
case 'z': /* compression level */
continue; /* currently ignored, just for write mode */
}
}
{
ZZIP_FILE* fp =
zzip_open_shared_io (stream, filename, o_flags, o_modes, 0, 0);
if (! o_modes&ZZIP_FACTORY && stream)
zzip_file_close (stream);
return fp;
}
}
/**
* This function will => open(2) a real/zipped file
*
* It has some magic functionality builtin - it will first try to open
* the given <em>filename</em> as a normal file. If it does not
* exist, the given path to the filename (if any) is split into
* its directory-part and the file-part. A ".zip" extension is
* then added to the directory-part to create the name of a
* zip-archive. That zip-archive (if it exists) is being searched
* for the file-part, and if found a zzip-handle is returned.
*
* Note that if the file is found in the normal fs-directory the
* returned structure is mostly empty and the => zzip_read call will
* use the libc => read to obtain data. Otherwise a => zzip_file_open
* is performed and any error mapped to => errno(3).
*
* There was a possibility to transfer zziplib-specific openmodes
* through o_flags but you should please not use them anymore and
* look into => zzip_open_ext_io to submit them down. This function
* is shallow in that it just extracts the zzipflags and calls <ul><li><code>
* zzip_open_ext_io(filename, o_flags, zzipflags|0664, 0, 0) </code></li></ul>
* you must stop using this extra functionality (not well known
* anyway) since zzip_open might be later usable to open files
* for writing in which case the _EXTRAFLAGS will get in conflict.
*
* compare with => open(2) and => zzip_fopen
*/
ZZIP_FILE*
zzip_open(zzip_char_t* filename, int o_flags)
{
/* backward compatibility */
int o_modes = 0664;
if (o_flags & ZZIP_CASEINSENSITIVE)
{ o_flags ^= ZZIP_CASEINSENSITIVE; o_modes |= ZZIP_CASELESS; }
if (o_flags & ZZIP_IGNOREPATH)
{ o_flags ^= ZZIP_IGNOREPATH; o_modes |= ZZIP_NOPATHS; }
return zzip_open_ext_io(filename, o_flags, o_modes, 0, 0);
}
/* ZZIP_ONLYZIP won't work on platforms with sizeof(int) == 16bit */
#if ZZIP_SIZEOF_INT+0 == 2
#undef ZZIP_ONLYZIP
#endif
/** => zzip_open
*
* This function uses explicit ext and io instead of the internal
* defaults, setting them to zero is equivalent to => zzip_open
*
* note that the two flag types have been split into an o_flags
* (for fcntl-like openflags) and o_modes where the latter shall
* carry the zzip_flags and possibly accessmodes for unix filesystems.
* Since this version of zziplib can not write zipfiles, it is not
* yet used for anything else than zzip-specific modeflags.
*/
ZZIP_FILE*
zzip_open_ext_io(zzip_char_t* filename, int o_flags, int o_modes,
zzip_strings_t* ext, zzip_plugin_io_t io)
{
return zzip_open_shared_io (0, filename, o_flags, o_modes, ext, io);
}
/** => zzip_open
*
* This function takes an extra stream argument - if a handle has been
* then ext/io can be left null and the new stream handle will pick up
* the ext/io. This should be used only in specific environment however
* since => zzip_file_real does not store any ext-sequence.
*
* The benefit for this function comes in when the old file handle
* was openened from a file within a zip archive. When the new file
* is in the same zip archive then the internal zzip_dir structures
* will be shared. It is even quicker, as no check needs to be done
* anymore trying to guess the zip archive place in the filesystem,
* here we just check whether the zip archive's filepath is a prefix
* part of the filename to be opened.
*
* Note that this function is also used by => zzip_freopen that
* will unshare the old handle, thereby possibly closing the handle.
*/
ZZIP_FILE*
zzip_open_shared_io (ZZIP_FILE* stream,
zzip_char_t* filename, int o_flags, int o_modes,
zzip_strings_t* ext, zzip_plugin_io_t io)
{
if (stream && stream->dir)
{
if (! ext) ext = stream->dir->fileext;
if (! io) io = stream->dir->io;
}
if (! io) io = zzip_get_default_io ();
if (o_modes & (ZZIP_PREFERZIP|ZZIP_ONLYZIP)) goto try_zzip;
try_real:
/* prefer an existing real file */
{
zzip_plugin_io_t os = (o_modes & ZZIP_ALLOWREAL)
? zzip_get_default_io () : io;
int fd = os->open(filename, o_flags); /* io->open */
if (fd != -1)
{
ZZIP_FILE* fp = calloc (1, sizeof(ZZIP_FILE));
if (!fp) { os->close(fd); return 0; } /* io->close */
fp->fd = fd;
fp->io = os;
return fp;
}
if (o_modes & ZZIP_PREFERZIP) return 0;
}
try_zzip:
/* if the user had it in place of a normal xopen, then
* we better defend this lib against illegal usage */
if (o_flags & (O_CREAT|O_WRONLY)) { errno = EINVAL; return 0; }
if (o_flags & (O_RDWR)) { o_flags ^= O_RDWR; o_flags |= O_RDONLY; }
/* this is just for backward compatibility -and strictly needed to
* prepare ourselves for more options and more options later on... */
/*# if (o_modes & ZZIP_CASELESS) { o_flags |= ZZIP_CASEINSENSITIVE; } */
/*# if (o_modes & ZZIP_NOPATHS) { o_flags |= ZZIP_IGNOREPATH; } */
/* see if we can open a file that is a zip file */
{ char basename[PATH_MAX];
char* p;
strcpy (basename, filename);
/* see if we can share the same zip directory */
if (stream && stream->dir && stream->dir->realname)
{
zzip_size_t len = strlen (stream->dir->realname);
if (! memcmp (filename, stream->dir->realname, len) &&
filename[len] == '/' && filename[len+1])
{
ZZIP_FILE* fp =
zzip_file_open (stream->dir, filename+len+1, o_modes);
if (! fp) { errno = zzip_errno (stream->dir->errcode); }
return fp;
}
}
/* per each slash in filename, check if it there is a zzip around */
while ((p = strrchr (basename, '/')))
{
zzip_error_t e = 0;
ZZIP_DIR* dir;
ZZIP_FILE* fp;
int fd;
*p = '\0'; /* cut at path separator == possible zipfile basename */
fd = __zzip_try_open (basename, o_flags|O_RDONLY|O_BINARY, ext, io);
if (fd == -1) { continue; }
/* found: */
/* found zip-file, now try to parse it */
dir = zzip_dir_fdopen_ext_io(fd, &e, ext, io);
if (e) { errno = zzip_errno(e); io->close(fd); return 0; }
/* (p - basename) is the lenghtof zzip_dir part of the filename */
fp = zzip_file_open(dir, filename + (p - basename) +1, o_modes);
if (! fp) { errno = zzip_errno(dir->errcode); }
else { if (! dir->realname) dir->realname = strdup (basename); }
zzip_dir_close(dir);
/* note: since (fp) is attached that (dir) will survive */
/* but (dir) is implicitly closed on next zzip_close(fp) */
return fp;
} /*again*/
if (o_modes & ZZIP_PREFERZIP) goto try_real;
errno = ENOENT; return 0;
}
}
#if defined ZZIP_LARGEFILE_RENAME && defined EOVERFLOW && defined PIC
#undef zzip_open_shared_io /* zzip_open_shared_io64 */
#undef zzip_open_ext_io /* zzip_open_ext_io64 */
#undef zzip_opendir_ext_io /* zzip_opendir_ext_io64 */
_zzip_export
ZZIP_FILE * zzip_open_shared_io(ZZIP_FILE* stream,
zzip_char_t* name, int o_flags, int o_modes,
zzip_strings_t* ext, zzip_plugin_io_t io)
{
if (! io) return zzip_open_shared_io64 (stream, name, o_flags, o_modes,
ext, io);
errno = EOVERFLOW; return NULL;
}
_zzip_export
ZZIP_FILE * zzip_open_ext_io(zzip_char_t* name, int o_flags, int o_modes,
zzip_strings_t* ext, zzip_plugin_io_t io)
{
if (! io) return zzip_open_ext_io64 (name, o_flags, o_modes, ext, io);
errno = EOVERFLOW; return NULL;
}
_zzip_export
ZZIP_DIR * zzip_opendir_ext_io(zzip_char_t* name, int o_modes,
zzip_strings_t* ext, zzip_plugin_io_t io)
{
if (! io) return zzip_opendir_ext_io64 (name, o_modes, ext, io);
errno = EOVERFLOW; return NULL;
}
#endif /* ZZIP_LARGEFILE_RENAME && EOVERFLOW && PIC */
/* ------------------------------------------------------------------- */
/**
* This function will rewind a real/zipped file.
*
* It seeks to the beginning of this file's data in the zip,
* or the beginning of the file for a stat'fd.
*/
int
zzip_rewind(ZZIP_FILE *fp)
{
ZZIP_DIR *dir;
int err;
if (! fp)
return -1;
if (! fp->dir)
{ /* stat fd */
fp->io->seeks(fp->fd,0,SEEK_SET);
return 0;
}
dir = fp->dir;
/*
* If this is other handle than previous, save current seek pointer
*/
if (dir->currentfp != fp)
{
if (zzip_file_saveoffset(dir->currentfp) < 0)
{ dir->errcode = ZZIP_DIR_SEEK; return -1; }
else
{ dir->currentfp = fp; }
}
/* seek to beginning of this file */
if (fp->io->seeks(dir->fd, fp->dataoffset, SEEK_SET) < 0)
return -1;
/* reset the inflate init stuff */
fp->restlen = fp->usize;
fp->offset = fp->dataoffset;
if (fp->method)
{ /* method == 8, deflate */
memset(&fp->d_stream, 0, sizeof fp->d_stream);
err = inflateInit2(&fp->d_stream, -MAX_WBITS);
if (err != Z_OK) { goto error; }
fp->crestlen = fp->csize;
}
return 0;
error:
if (fp) zzip_file_close(fp);
return err;
}
/**
* This function will perform a => lseek(2) operation on a real/zipped file
*
* It will try to seek to the offset specified by offset, relative to whence,
* which is one of SEEK_SET, SEEK_CUR or SEEK_END.
*
* If the file-handle is wrapping a stat'able file then it will actually just
* perform a normal => lseek(2)-call. Otherwise the relative offset
* is calculated, negative offsets are transformed into positive ones
* by rewinding the file, and then data is read until the offset is
* reached. This can make the function terribly slow, but this is
* how gzio implements it, so I'm not sure there is a better way
* without using the internals of the algorithm.
*/
zzip_off_t
zzip_seek(ZZIP_FILE * fp, zzip_off_t offset, int whence)
{
zzip_off_t cur_pos, rel_ofs, read_size, ofs;
ZZIP_DIR *dir;
if (! fp)
return -1;
if (! fp->dir)
{ /* stat fd */
return fp->io->seeks(fp->fd, offset, whence);
}
cur_pos = zzip_tell(fp);
/* calculate relative offset */
switch (whence)
{
case SEEK_SET: /* from beginning */
rel_ofs = offset - cur_pos;
break;
case SEEK_CUR: /* from current */
rel_ofs = offset;
break;
case SEEK_END: /* from end */
rel_ofs = fp->usize + offset - cur_pos;
break;
default: /* something wrong */
return -1;
}
if (rel_ofs == 0)
return cur_pos; /* don't have to move */
if (rel_ofs < 0)
{ /* convert backward into forward */
if (zzip_rewind(fp) == -1)
return -1;
read_size = cur_pos + rel_ofs;
cur_pos = 0;
}else
{ /* amount to read is positive relative offset */
read_size = rel_ofs;
}
if (read_size < 0) /* bad offset, before beginning of file */
return -1;
if (read_size + cur_pos > (zzip_off_t)fp->usize) /* bad offset, past EOF */
return -1;
if (read_size == 0) /* nothing to read */
return cur_pos;
dir = fp->dir;
/*
* If this is other handle than previous, save current seek pointer
* and read the file position of `this' handle.
*/
if (dir->currentfp != fp)
{
if (zzip_file_saveoffset(dir->currentfp) < 0
|| dir->currentfp->io->seeks(dir->fd, fp->offset, SEEK_SET) < 0)
{ dir->errcode = ZZIP_DIR_SEEK; return -1; }
else
{ dir->currentfp = fp; }
}
if (fp->method == 0)
{ /* unstore, just lseek relatively */
ofs = fp->io->tells(dir->fd);
ofs = fp->io->seeks(dir->fd,read_size,SEEK_CUR);
if (ofs > 0)
{ /* readjust from beginning of file */
ofs -= fp->dataoffset;
fp->restlen = fp->usize - ofs;
}
return ofs;
}else
{ /* method == 8, inflate */
char *buf;
/*FIXME: use a static buffer! */
buf = (char *)malloc(ZZIP_32K);
if (! buf) return -1;
while (read_size > 0)
{
zzip_off_t size = ZZIP_32K;
if (read_size < size/*32K*/) size = read_size;
size = zzip_file_read(fp, buf, (zzip_size_t)size);
if (size <= 0) { free(buf); return -1; }
read_size -= size;
}
free (buf);
}
return zzip_tell(fp);
}
/**
* This function will => tell(2) the current position in a real/zipped file
*
* It will return the current offset within the real/zipped file,
* measured in uncompressed bytes for the zipped-file case.
*
* If the file-handle is wrapping a stat'able file then it will actually just
* perform a normal => tell(2)-call, otherwise the offset is
* calculated from the amount of data left and the total uncompressed
* size;
*/
zzip_off_t
zzip_tell(ZZIP_FILE * fp)
{
if (! fp)
return -1;
if (! fp->dir) /* stat fd */
return fp->io->tells(fp->fd);
/* current uncompressed offset is uncompressed size - data left */
return (fp->usize - fp->restlen);
}
/*
* Local variables:
* c-file-style: "stroustrup"
* End:
*/