diff options
Diffstat (limited to 'contrib/libarchive/libarchive/archive_check_magic.c')
| -rw-r--r-- | contrib/libarchive/libarchive/archive_check_magic.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/contrib/libarchive/libarchive/archive_check_magic.c b/contrib/libarchive/libarchive/archive_check_magic.c new file mode 100644 index 0000000..e27e5d8 --- /dev/null +++ b/contrib/libarchive/libarchive/archive_check_magic.c @@ -0,0 +1,134 @@ +/*- + * 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_check_magic.c 201089 2009-12-28 02:20:23Z kientzle $"); + +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif + +#include <stdio.h> +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif +#ifdef HAVE_STRING_H +#include <string.h> +#endif +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#if defined(_WIN32) && !defined(__CYGWIN__) +#include <windows.h> +#include <winbase.h> +#endif + +#include "archive_private.h" + +static void +errmsg(const char *m) +{ + size_t s = strlen(m); + ssize_t written; + + while (s > 0) { + written = write(2, m, strlen(m)); + if (written <= 0) + return; + m += written; + s -= written; + } +} + +static void +diediedie(void) +{ +#if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG) + /* Cause a breakpoint exception */ + DebugBreak(); +#endif + abort(); /* Terminate the program abnormally. */ +} + +static const char * +state_name(unsigned s) +{ + switch (s) { + case ARCHIVE_STATE_NEW: return ("new"); + case ARCHIVE_STATE_HEADER: return ("header"); + case ARCHIVE_STATE_DATA: return ("data"); + case ARCHIVE_STATE_EOF: return ("eof"); + case ARCHIVE_STATE_CLOSED: return ("closed"); + case ARCHIVE_STATE_FATAL: return ("fatal"); + default: return ("??"); + } +} + + +static void +write_all_states(unsigned int states) +{ + unsigned int lowbit; + + /* A trick for computing the lowest set bit. */ + while ((lowbit = states & (1 + ~states)) != 0) { + states &= ~lowbit; /* Clear the low bit. */ + errmsg(state_name(lowbit)); + if (states != 0) + errmsg("/"); + } +} + +/* + * Check magic value and current state; bail if it isn't valid. + * + * This is designed to catch serious programming errors that violate + * the libarchive API. + */ +void +__archive_check_magic(struct archive *a, unsigned int magic, + unsigned int state, const char *function) +{ + if (a->magic != magic) { + errmsg("INTERNAL ERROR: Function "); + errmsg(function); + errmsg(" invoked with invalid struct archive structure.\n"); + diediedie(); + } + + if (state == ARCHIVE_STATE_ANY) + return; + + if ((a->state & state) == 0) { + errmsg("INTERNAL ERROR: Function '"); + errmsg(function); + errmsg("' invoked with archive structure in state '"); + write_all_states(a->state); + errmsg("', should be in state '"); + write_all_states(state); + errmsg("'\n"); + diediedie(); + } +} |
