134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/*-
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* Copyright (c) 2003-2007 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD: head/lib/libarchive/archive_check_magic.c 201089 2009-12-28 02:20:23Z kientzle $");
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if defined(_WIN32) && !defined(__CYGWIN__)
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#include <windows.h>
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#include <winbase.h>
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#endif
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#include "archive_private.h"
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static void
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errmsg(const char *m)
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{
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size_t s = strlen(m);
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ssize_t written;
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while (s > 0) {
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written = write(2, m, strlen(m));
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if (written <= 0)
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return;
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m += written;
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s -= written;
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}
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}
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static void
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diediedie(void)
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{
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#if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG)
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/* Cause a breakpoint exception */
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DebugBreak();
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#endif
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abort(); /* Terminate the program abnormally. */
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}
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static const char *
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state_name(unsigned s)
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{
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switch (s) {
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case ARCHIVE_STATE_NEW: return ("new");
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case ARCHIVE_STATE_HEADER: return ("header");
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case ARCHIVE_STATE_DATA: return ("data");
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case ARCHIVE_STATE_EOF: return ("eof");
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case ARCHIVE_STATE_CLOSED: return ("closed");
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case ARCHIVE_STATE_FATAL: return ("fatal");
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default: return ("??");
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}
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}
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static void
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write_all_states(unsigned int states)
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{
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unsigned int lowbit;
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/* A trick for computing the lowest set bit. */
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while ((lowbit = states & (1 + ~states)) != 0) {
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states &= ~lowbit; /* Clear the low bit. */
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errmsg(state_name(lowbit));
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if (states != 0)
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errmsg("/");
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}
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}
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/*
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* Check magic value and current state; bail if it isn't valid.
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*
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* This is designed to catch serious programming errors that violate
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* the libarchive API.
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*/
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void
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__archive_check_magic(struct archive *a, unsigned int magic,
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unsigned int state, const char *function)
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{
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if (a->magic != magic) {
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errmsg("INTERNAL ERROR: Function ");
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errmsg(function);
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errmsg(" invoked with invalid struct archive structure.\n");
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diediedie();
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}
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if (state == ARCHIVE_STATE_ANY)
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return;
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if ((a->state & state) == 0) {
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errmsg("INTERNAL ERROR: Function '");
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errmsg(function);
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errmsg("' invoked with archive structure in state '");
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write_all_states(a->state);
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errmsg("', should be in state '");
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write_all_states(state);
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errmsg("'\n");
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diediedie();
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}
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}
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