/*-

 * Copyright (c) 2009-2012,2014 Michihiro NAKAJIMA

 * Copyright (c) 2003-2007 Tim Kientzle

 * All rights reserved.

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 "archive_platform.h"

__FBSDID("$FreeBSD: head/lib/libarchive/archive_util.c 201098 2009-12-28 02:58:14Z kientzle $");

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

#ifdef HAVE_ERRNO_H

#include <errno.h>

#endif

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifdef HAVE_STRING_H

#include <string.h>

#endif

#if defined(HAVE_WINCRYPT_H) && !defined(__CYGWIN__)

#include <wincrypt.h>

#endif

#ifdef HAVE_ZLIB_H

#include <zlib.h>

#endif

#ifdef HAVE_LZMA_H

#include <lzma.h>

#endif

#ifdef HAVE_BZLIB_H

#include <bzlib.h>

#endif

#ifdef HAVE_LZ4_H

#include <lz4.h>

#endif

#include "archive.h"

#include "archive_private.h"

#include "archive_random_private.h"

#include "archive_string.h"

#ifndef O_CLOEXEC

#define O_CLOEXEC	0

#endif

static int archive_utility_string_sort_helper(char **, unsigned int);

/* Generic initialization of 'struct archive' objects. */

int

__archive_clean(struct archive *a)

{

	archive_string_conversion_free(a);

	return (ARCHIVE_OK);

}

int

archive_version_number(void)

{

	return (ARCHIVE_VERSION_NUMBER);

}

const char *

archive_version_string(void)

{

	return (ARCHIVE_VERSION_STRING);

}

int

archive_errno(struct archive *a)

{

	return (a->archive_error_number);

}

const char *

archive_error_string(struct archive *a)

{

	if (a->error != NULL  &&  *a->error != '\0')

		return (a->error);

	else

		return (NULL);

}

int

archive_file_count(struct archive *a)

{

	return (a->file_count);

}

int

archive_format(struct archive *a)

{

	return (a->archive_format);

}

const char *

archive_format_name(struct archive *a)

{

	return (a->archive_format_name);

}

int

archive_compression(struct archive *a)

{

	return archive_filter_code(a, 0);

}

const char *

archive_compression_name(struct archive *a)

{

	return archive_filter_name(a, 0);

}

/*

 * Return a count of the number of compressed bytes processed.

 */

la_int64_t

archive_position_compressed(struct archive *a)

{

	return archive_filter_bytes(a, -1);

}

/*

 * Return a count of the number of uncompressed bytes processed.

 */

la_int64_t

archive_position_uncompressed(struct archive *a)

{

	return archive_filter_bytes(a, 0);

}

void

archive_clear_error(struct archive *a)

{

	archive_string_empty(&a->error_string);

	a->error = NULL;

	a->archive_error_number = 0;

}

void

archive_set_error(struct archive *a, int error_number, const char *fmt, ...)

{

	va_list ap;

	a->archive_error_number = error_number;

	if (fmt == NULL) {

		a->error = NULL;

		return;

	}

	archive_string_empty(&(a->error_string));

	va_start(ap, fmt);

	archive_string_vsprintf(&(a->error_string), fmt, ap);

	va_end(ap);

	a->error = a->error_string.s;

}

void

archive_copy_error(struct archive *dest, struct archive *src)

{

	dest->archive_error_number = src->archive_error_number;

	archive_string_copy(&dest->error_string, &src->error_string);

	dest->error = dest->error_string.s;

}

void

__archive_errx(int retvalue, const char *msg)

{

	static const char msg1[] = "Fatal Internal Error in libarchive: ";

	size_t s;

	s = write(2, msg1, strlen(msg1));

	(void)s; /* UNUSED */

	s = write(2, msg, strlen(msg));

	(void)s; /* UNUSED */

	s = write(2, "\n", 1);

	(void)s; /* UNUSED */

	exit(retvalue);

}

/*

 * Create a temporary file

 */

#if defined(_WIN32) && !defined(__CYGWIN__)

/*

 * Do not use Windows tmpfile() function.

 * It will make a temporary file under the root directory

 * and it'll cause permission error if a user who is

 * non-Administrator creates temporary files.

 * Also Windows version of mktemp family including _mktemp_s

 * are not secure.

 */

int

__archive_mktemp(const char *tmpdir)

{

	static const wchar_t prefix[] = L"libarchive_";

	static const wchar_t suffix[] = L"XXXXXXXXXX";

	static const wchar_t num[] = {

		L'0', L'1', L'2', L'3', L'4', L'5', L'6', L'7',

		L'8', L'9', L'A', L'B', L'C', L'D', L'E', L'F',

		L'G', L'H', L'I', L'J', L'K', L'L', L'M', L'N',

		L'O', L'P', L'Q', L'R', L'S', L'T', L'U', L'V',

		L'W', L'X', L'Y', L'Z', L'a', L'b', L'c', L'd',

		L'e', L'f', L'g', L'h', L'i', L'j', L'k', L'l',

		L'm', L'n', L'o', L'p', L'q', L'r', L's', L't',

		L'u', L'v', L'w', L'x', L'y', L'z'

	};

	HCRYPTPROV hProv;

	struct archive_wstring temp_name;

	wchar_t *ws;

	DWORD attr;

	wchar_t *xp, *ep;

	int fd;

	hProv = (HCRYPTPROV)NULL;

	fd = -1;

	ws = NULL;

	archive_string_init(&temp_name);

	/* Get a temporary directory. */

	if (tmpdir == NULL) {

		size_t l;

		wchar_t *tmp;

		l = GetTempPathW(0, NULL);

		if (l == 0) {

			la_dosmaperr(GetLastError());

			goto exit_tmpfile;

		}

		tmp = malloc(l*sizeof(wchar_t));

		if (tmp == NULL) {

			errno = ENOMEM;

			goto exit_tmpfile;

		}

		GetTempPathW((DWORD)l, tmp);

		archive_wstrcpy(&temp_name, tmp);

		free(tmp);

	} else {

		if (archive_wstring_append_from_mbs(&temp_name, tmpdir,

		    strlen(tmpdir)) < 0)

			goto exit_tmpfile;

		if (temp_name.s[temp_name.length-1] != L'/')

			archive_wstrappend_wchar(&temp_name, L'/');

	}

	/* Check if temp_name is a directory. */

	attr = GetFileAttributesW(temp_name.s);

	if (attr == (DWORD)-1) {

		if (GetLastError() != ERROR_FILE_NOT_FOUND) {

			la_dosmaperr(GetLastError());

			goto exit_tmpfile;

		}

		ws = __la_win_permissive_name_w(temp_name.s);

		if (ws == NULL) {

			errno = EINVAL;

			goto exit_tmpfile;

		}

		attr = GetFileAttributesW(ws);

		if (attr == (DWORD)-1) {

			la_dosmaperr(GetLastError());

			goto exit_tmpfile;

		}

	}

	if (!(attr & FILE_ATTRIBUTE_DIRECTORY)) {

		errno = ENOTDIR;

		goto exit_tmpfile;

	}

	/*

	 * Create a temporary file.

	 */

	archive_wstrcat(&temp_name, prefix);

	archive_wstrcat(&temp_name, suffix);

	ep = temp_name.s + archive_strlen(&temp_name);

	xp = ep - wcslen(suffix);

	if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,

		CRYPT_VERIFYCONTEXT)) {

		la_dosmaperr(GetLastError());

		goto exit_tmpfile;

	}

	for (;;) {

		wchar_t *p;

		HANDLE h;

		/* Generate a random file name through CryptGenRandom(). */

		p = xp;

		if (!CryptGenRandom(hProv, (DWORD)(ep - p)*sizeof(wchar_t),

		    (BYTE*)p)) {

			la_dosmaperr(GetLastError());

			goto exit_tmpfile;

		}

		for (; p < ep; p++)

			*p = num[((DWORD)*p) % (sizeof(num)/sizeof(num[0]))];

		free(ws);

		ws = __la_win_permissive_name_w(temp_name.s);

		if (ws == NULL) {

			errno = EINVAL;

			goto exit_tmpfile;

		}

		/* Specifies FILE_FLAG_DELETE_ON_CLOSE flag is to

		 * delete this temporary file immediately when this

		 * file closed. */

		h = CreateFileW(ws,

		    GENERIC_READ | GENERIC_WRITE | DELETE,

		    0,/* Not share */

		    NULL,

		    CREATE_NEW,/* Create a new file only */

		    FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE,

		    NULL);

		if (h == INVALID_HANDLE_VALUE) {

			/* The same file already exists. retry with

			 * a new filename. */

			if (GetLastError() == ERROR_FILE_EXISTS)

				continue;

			/* Otherwise, fail creation temporary file. */

			la_dosmaperr(GetLastError());

			goto exit_tmpfile;

		}

		fd = _open_osfhandle((intptr_t)h, _O_BINARY | _O_RDWR);

		if (fd == -1) {

			CloseHandle(h);

			goto exit_tmpfile;

		} else

			break;/* success! */

	}

exit_tmpfile:

	if (hProv != (HCRYPTPROV)NULL)

		CryptReleaseContext(hProv, 0);

	free(ws);

	archive_wstring_free(&temp_name);

	return (fd);

}

#else

static int

get_tempdir(struct archive_string *temppath)

{

	const char *tmp;

	tmp = getenv("TMPDIR");

	if (tmp == NULL)

#ifdef _PATH_TMP

		tmp = _PATH_TMP;

#else

                tmp = "/tmp";

#endif

	archive_strcpy(temppath, tmp);

	if (temppath->s[temppath->length-1] != '/')

		archive_strappend_char(temppath, '/');

	return (ARCHIVE_OK);

}

#if defined(HAVE_MKSTEMP)

/*

 * We can use mkstemp().

 */

int

__archive_mktemp(const char *tmpdir)

{

	struct archive_string temp_name;

	int fd = -1;

	archive_string_init(&temp_name);

	if (tmpdir == NULL) {

		if (get_tempdir(&temp_name) != ARCHIVE_OK)

			goto exit_tmpfile;

	} else {

		archive_strcpy(&temp_name, tmpdir);

		if (temp_name.s[temp_name.length-1] != '/')

			archive_strappend_char(&temp_name, '/');

	}

	archive_strcat(&temp_name, "libarchive_XXXXXX");

	fd = mkstemp(temp_name.s);

	if (fd < 0)

		goto exit_tmpfile;

	__archive_ensure_cloexec_flag(fd);

	unlink(temp_name.s);

exit_tmpfile:

	archive_string_free(&temp_name);

	return (fd);

}

#else

/*

 * We use a private routine.

 */

int

__archive_mktemp(const char *tmpdir)

{

        static const char num[] = {

		'0', '1', '2', '3', '4', '5', '6', '7',

		'8', '9', 'A', 'B', 'C', 'D', 'E', 'F',

		'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',

		'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',

		'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',

		'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',

		'm', 'n', 'o', 'p', 'q', 'r', 's', 't',

		'u', 'v', 'w', 'x', 'y', 'z'

        };

	struct archive_string temp_name;

	struct stat st;

	int fd;

	char *tp, *ep;

	fd = -1;

	archive_string_init(&temp_name);

	if (tmpdir == NULL) {

		if (get_tempdir(&temp_name) != ARCHIVE_OK)

			goto exit_tmpfile;

	} else

		archive_strcpy(&temp_name, tmpdir);

	if (temp_name.s[temp_name.length-1] == '/') {

		temp_name.s[temp_name.length-1] = '\0';

		temp_name.length --;

	}

	if (stat(temp_name.s, &st) < 0)

		goto exit_tmpfile;

	if (!S_ISDIR(st.st_mode)) {

		errno = ENOTDIR;

		goto exit_tmpfile;

	}

	archive_strcat(&temp_name, "/libarchive_");

	tp = temp_name.s + archive_strlen(&temp_name);

	archive_strcat(&temp_name, "XXXXXXXXXX");

	ep = temp_name.s + archive_strlen(&temp_name);

	do {

		char *p;

		p = tp;

		archive_random(p, ep - p);

		while (p < ep) {

			int d = *((unsigned char *)p) % sizeof(num);

			*p++ = num[d];

		}

		fd = open(temp_name.s, O_CREAT | O_EXCL | O_RDWR | O_CLOEXEC,

			  0600);

	} while (fd < 0 && errno == EEXIST);

	if (fd < 0)

		goto exit_tmpfile;

	__archive_ensure_cloexec_flag(fd);

	unlink(temp_name.s);

exit_tmpfile:

	archive_string_free(&temp_name);

	return (fd);

}

#endif /* HAVE_MKSTEMP */

#endif /* !_WIN32 || __CYGWIN__ */

/*

 * Set FD_CLOEXEC flag to a file descriptor if it is not set.

 * We have to set the flag if the platform does not provide O_CLOEXEC

 * or F_DUPFD_CLOEXEC flags.

 *

 * Note: This function is absolutely called after creating a new file

 * descriptor even if the platform seemingly provides O_CLOEXEC or

 * F_DUPFD_CLOEXEC macros because it is possible that the platform

 * merely declares those macros, especially Linux 2.6.18 - 2.6.24 do it.

 */

void

__archive_ensure_cloexec_flag(int fd)

{

#if defined(_WIN32) && !defined(__CYGWIN__)

	(void)fd; /* UNUSED */

#else

	int flags;

	if (fd >= 0) {

		flags = fcntl(fd, F_GETFD);

		if (flags != -1 && (flags & FD_CLOEXEC) == 0)

			fcntl(fd, F_SETFD, flags | FD_CLOEXEC);

	}

#endif

}

/*

 * Utility function to sort a group of strings using quicksort.

 */

static int

archive_utility_string_sort_helper(char **strings, unsigned int n)

{

	unsigned int i, lesser_count, greater_count;

	char **lesser, **greater, **tmp, *pivot;

	int retval1, retval2;

	/* A list of 0 or 1 elements is already sorted */

	if (n <= 1)

		return (ARCHIVE_OK);

	lesser_count = greater_count = 0;

	lesser = greater = NULL;

	pivot = strings[0];

	for (i = 1; i < n; i++)

	{

		if (strcmp(strings[i], pivot) < 0)

		{

			lesser_count++;

			tmp = (char **)realloc(lesser,

				lesser_count * sizeof(char *));

			if (!tmp) {

				free(greater);

				free(lesser);

				return (ARCHIVE_FATAL);

			}

			lesser = tmp;

			lesser[lesser_count - 1] = strings[i];

		}

		else

		{

			greater_count++;

			tmp = (char **)realloc(greater,

				greater_count * sizeof(char *));

			if (!tmp) {

				free(greater);

				free(lesser);

				return (ARCHIVE_FATAL);

			}

			greater = tmp;

			greater[greater_count - 1] = strings[i];

		}

	}

	/* quicksort(lesser) */

	retval1 = archive_utility_string_sort_helper(lesser, lesser_count);

	for (i = 0; i < lesser_count; i++)

		strings[i] = lesser[i];

	free(lesser);

	/* pivot */

	strings[lesser_count] = pivot;

	/* quicksort(greater) */

	retval2 = archive_utility_string_sort_helper(greater, greater_count);

	for (i = 0; i < greater_count; i++)

		strings[lesser_count + 1 + i] = greater[i];

	free(greater);

	return (retval1 < retval2) ? retval1 : retval2;

}

int

archive_utility_string_sort(char **strings)

{

	  unsigned int size = 0;

	  while (strings[size] != NULL)

		size++;

	  return archive_utility_string_sort_helper(strings, size);

}