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  zip_open.c -- open zip archive by name
  Copyright (C) 1999-2012 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <libzip@nih.at>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The names of the authors may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.
 
  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#include <sys/stat.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "zipint.h"

static void set_error(int *, const struct zip_error *, int);
static struct zip *_zip_allocate_new(const char *, unsigned int, int *);
static zip_int64_t _zip_checkcons(FILE *, struct zip_cdir *, struct zip_error *);
static void _zip_check_torrentzip(struct zip *, const struct zip_cdir *);
static struct zip_cdir *_zip_find_central_dir(FILE *, unsigned int, int *, off_t);
static int _zip_file_exists(const char *, unsigned int, int *);
static int _zip_headercomp(const struct zip_dirent *, const struct zip_dirent *);
static unsigned char *_zip_memmem(const unsigned char *, size_t,
				  const unsigned char *, size_t);
static struct zip_cdir *_zip_readcdir(FILE *, off_t, unsigned char *, const unsigned char *,
				 size_t, unsigned int, struct zip_error *);
static struct zip_cdir *_zip_read_eocd(const unsigned char *, const unsigned char *, off_t,
				       size_t, unsigned int, struct zip_error *);
static struct zip_cdir *_zip_read_eocd64(FILE *, const unsigned char *, const unsigned char *,
					 off_t, size_t, unsigned int, struct zip_error *);


ZIP_EXTERN struct zip *
zip_open(const char *fn, int _flags, int *zep)
{
    FILE *fp;
    unsigned int flags;
    
    if (_flags < 0) {
        if (zep)
            *zep = ZIP_ER_INVAL;
        return NULL;
    }
    flags = (unsigned int)_flags;
        
    switch (_zip_file_exists(fn, flags, zep)) {
    case -1:
	return NULL;
    case 0:
	return _zip_allocate_new(fn, flags, zep);
    default:
	if (flags & ZIP_TRUNCATE) {
	    FILE *f;
	    
	    if ((f = fopen(fn, "rb")) == NULL) {
		set_error(zep, NULL, ZIP_ER_OPEN);
		return NULL;
	    }
	    fclose(f);
	    return _zip_allocate_new(fn, flags, zep);
	}
	break;
    }

    if ((fp=fopen(fn, "rb")) == NULL) {
	set_error(zep, NULL, ZIP_ER_OPEN);
	return NULL;
    }

    return _zip_open(fn, fp, flags, zep);
}


ZIP_EXTERN int
zip_archive_set_tempdir(struct zip *za, const char *tempdir)
{
    char *new_tempdir;
    
    if (tempdir) {
        if ((new_tempdir = strdup(tempdir)) == NULL) {
            _zip_error_set(&za->error, ZIP_ER_MEMORY, errno);
            return -1;
        }
    }
    else
        new_tempdir = NULL;
    
    free(za->tempdir);
    za->tempdir = new_tempdir;
    
    return 0;
}


struct zip *
_zip_open(const char *fn, FILE *fp,