chromium/third_party/libzip/src/lib/zip_open.c

/*
  zip_open.c -- open zip archive by name
  Copyright (C) 1999-2019 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <[email protected]>

  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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "zipint.h"

exists_t;
static zip_t *_zip_allocate_new(zip_source_t *src, unsigned int flags, zip_error_t *error);
static zip_int64_t _zip_checkcons(zip_t *za, zip_cdir_t *cdir, zip_error_t *error);
static zip_cdir_t *_zip_find_central_dir(zip_t *za, zip_uint64_t len);
static exists_t _zip_file_exists(zip_source_t *src, zip_error_t *error);
static int _zip_headercomp(const zip_dirent_t *, const zip_dirent_t *);
static unsigned char *_zip_memmem(const unsigned char *, size_t, const unsigned char *, size_t);
static zip_cdir_t *_zip_read_cdir(zip_t *za, zip_buffer_t *buffer, zip_uint64_t buf_offset, zip_error_t *error);
static zip_cdir_t *_zip_read_eocd(zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error);
static zip_cdir_t *_zip_read_eocd64(zip_source_t *src, zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error);


ZIP_EXTERN zip_t *
zip_open(const char *fn, int _flags, int *zep) { … }


ZIP_EXTERN zip_t *
zip_open_from_source(zip_source_t *src, int _flags, zip_error_t *error) { … }


zip_t *
_zip_open(zip_source_t *src, unsigned int flags, zip_error_t *error) { … }


void
_zip_set_open_error(int *zep, const zip_error_t *err, int ze) { … }


/* _zip_readcdir:
   tries to find a valid end-of-central-directory at the beginning of
   buf, and then the corresponding central directory entries.
   Returns a struct zip_cdir which contains the central directory
   entries, or NULL if unsuccessful. */

static zip_cdir_t *
_zip_read_cdir(zip_t *za, zip_buffer_t *buffer, zip_uint64_t buf_offset, zip_error_t *error) { … }


/* _zip_checkcons:
   Checks the consistency of the central directory by comparing central
   directory entries with local headers and checking for plausible
   file and header offsets. Returns -1 if not plausible, else the
   difference between the lowest and the highest fileposition reached */

static zip_int64_t
_zip_checkcons(zip_t *za, zip_cdir_t *cd, zip_error_t *error) { … }


/* _zip_headercomp:
   compares a central directory entry and a local file header
   Return 0 if they are consistent, -1 if not. */

static int
_zip_headercomp(const zip_dirent_t *central, const zip_dirent_t *local) { … }


static zip_t *
_zip_allocate_new(zip_source_t *src, unsigned int flags, zip_error_t *error) { … }


/*
 * tests for file existence
 */
static exists_t
_zip_file_exists(zip_source_t *src, zip_error_t *error) { … }


static zip_cdir_t *
_zip_find_central_dir(zip_t *za, zip_uint64_t len) { … }


static unsigned char *
_zip_memmem(const unsigned char *big, size_t biglen, const unsigned char *little, size_t littlelen) { … }


static zip_cdir_t *
_zip_read_eocd(zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error) { … }


static zip_cdir_t *
_zip_read_eocd64(zip_source_t *src, zip_buffer_t *buffer, zip_uint64_t buf_offset, unsigned int flags, zip_error_t *error) { … }