/*-
 * Copyright (c) 2009,2010 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

#include "archive.h"
#include "archive_private.h"
#include "archive_string.h"

/* Generic initialization of 'struct archive' objects. */
int
__archive_clean(struct archive *a)
{
#if HAVE_ICONV
	int i;

	free(a->current_code);

	for (i = 0; i < ICONV_TABLE_SIZE; i++) {
		free(a->iconv_table[i].charset);
		if (a->iconv_table[i].to_current != (iconv_t)0)
			iconv_close(a->iconv_table[i].to_current);
		if (a->iconv_table[i].from_current != (iconv_t)0)
			iconv_close(a->iconv_table[i].from_current);
	}
#endif
	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.
 */
int64_t
archive_position_compressed(struct archive *a)
{
	return archive_filter_bytes(a, -1);
}

/*
 * Return a count of the number of uncompressed bytes processed.
 */
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__)

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;
	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;
	unsigned seed;

	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);

	fd = open("/dev/random", O_RDONLY);
	if (fd < 0)
		seed = time(NULL);
	else {
		if (read(fd, &seed, sizeof(seed)) < 0)
			seed = time(NULL);
		close(fd);
	}
	do {
		char *p;

		p = tp;
		while (p < ep)
			*p++ = num[((unsigned)rand_r(&seed)) % sizeof(num)];
		fd = open(temp_name.s, O_CREAT | O_EXCL | O_RDWR, 0600);
	} while (fd < 0 && errno == EEXIST);
	if (fd < 0)
		goto exit_tmpfile;
	unlink(temp_name.s);
exit_tmpfile:
	archive_string_free(&temp_name);
	return (fd);
}

#endif /* HAVE_MKSTEMP */
#endif /* !_WIN32 || __CYGWIN__ */