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/*-
* Copyright (c) 2003-2010 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 const char *
archive_handle_type_name(unsigned m)
{
switch (m) {
case ARCHIVE_WRITE_MAGIC: return ("archive_write");
case ARCHIVE_READ_MAGIC: return ("archive_read");
case ARCHIVE_WRITE_DISK_MAGIC: return ("archive_write_disk");
case ARCHIVE_READ_DISK_MAGIC: return ("archive_read_disk");
case ARCHIVE_MATCH_MAGIC: return ("archive_match");
default: return NULL;
}
}
static char *
write_all_states(char *buff, unsigned int states)
{
unsigned int lowbit;
buff[0] = '\0';
/* A trick for computing the lowest set bit. */
while ((lowbit = states & (1 + ~states)) != 0) {
states &= ~lowbit; /* Clear the low bit. */
strcat(buff, state_name(lowbit));
if (states != 0)
strcat(buff, "/");
}
return buff;
}
/*
* Check magic value and current state.
* Magic value mismatches are fatal and result in calls to abort().
* State mismatches return ARCHIVE_FATAL.
* Otherwise, returns ARCHIVE_OK.
*
* This is designed to catch serious programming errors that violate
* the libarchive API.
*/
int
__archive_check_magic(struct archive *a, unsigned int magic,
unsigned int state, const char *function)
{
char states1[64];
char states2[64];
const char *handle_type;
/*
* If this isn't some form of archive handle,
* then the library user has screwed up so bad that
* we don't even have a reliable way to report an error.
*/
handle_type = archive_handle_type_name(a->magic);
if (!handle_type) {
errmsg("PROGRAMMER ERROR: Function ");
errmsg(function);
errmsg(" invoked with invalid archive handle.\n");
diediedie();
}
if (a->magic != magic) {
archive_set_error(a, -1,
"PROGRAMMER ERROR: Function '%s' invoked"
" on '%s' archive object, which is not supported.",
function,
handle_type);
a->state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
if ((a->state & state) == 0) {
/* If we're already FATAL, don't overwrite the error. */
if (a->state != ARCHIVE_STATE_FATAL)
archive_set_error(a, -1,
"INTERNAL ERROR: Function '%s' invoked with"
" archive structure in state '%s',"
" should be in state '%s'",
function,
write_all_states(states1, a->state),
write_all_states(states2, state));
a->state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
return ARCHIVE_OK;
}
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