source: lib/format_helper.c @ 3eff1c8

/*
 * This file is part of libtrace
 *
 * Copyright (c) 2004 The University of Waikato, Hamilton, New Zealand.
 * Authors: Daniel Lawson 
 *          Perry Lorier 
 *          
 * All rights reserved.
 *
 * This code has been developed by the University of Waikato WAND 
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libtrace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * libtrace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with libtrace; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id$
 *
 */

#include "config.h"
#include <sys/types.h>
#include <fcntl.h> /* for O_LARGEFILE */
#include "libtrace.h"
#include "libtrace_int.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "format_helper.h"

#include <assert.h>
#include <stdarg.h>

#ifdef WIN32
#  include <io.h>
#  include <share.h>
#  define snprintf sprintf_s

struct libtrace_eventobj_t trace_event_device(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
    struct libtrace_eventobj_t event = {0,0,0.0,0};

    trace_set_err(trace,TRACE_ERR_OPTION_UNAVAIL, "trace_event() is not "
            "supported on devices under windows in this version");

    event.type = TRACE_EVENT_TERMINATE;
    return event;
}
#else
#  include <sys/ioctl.h>

struct libtrace_eventobj_t trace_event_device(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
        struct libtrace_eventobj_t event = {0,0,0.0,0};
        int data;

        assert(trace != NULL);
        assert(packet != NULL);
        
        if (trace->format->get_fd) {
                event.fd = trace->format->get_fd(trace);
        } else {
                event.fd = 0;
        }
        if (ioctl(event.fd,FIONREAD,&data)==-1) {
                event.type = TRACE_EVENT_TERMINATE;
                return event;
        } 
                
        if (data>0) {
                event.size = trace_read_packet(trace,packet);
                event.type = TRACE_EVENT_PACKET;
                return event;
        }
        event.type= TRACE_EVENT_IOWAIT;
        return event;
}
#endif

struct libtrace_eventobj_t trace_event_trace(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
        struct libtrace_eventobj_t event = {0,0,0.0,0};
        double ts;
        double now;
        struct timeval stv;

        if (!trace->event.packet) {
                trace->event.packet = trace_create_packet();
                trace->event.psize=
                        trace_read_packet(trace,trace->event.packet);
                if (trace->event.psize<1) {
                        /* return here, the test for
                         * event.size will sort out the error
                         */
                        event.type = TRACE_EVENT_TERMINATE;
                        return event;
                }
        }

        ts=trace_get_seconds(trace->event.packet);
        if (trace->event.tdelta!=0.0) {
                /* Get the adjusted current time */
                gettimeofday(&stv, NULL);
                now = stv.tv_sec + 
                        ((double)stv.tv_usec / 1000000.0);
                /* adjust for trace delta */
                now -= trace->event.tdelta; 

                /* if the trace timestamp is still in the 
                 * future, return a SLEEP event, 
                 * otherwise fire the packet
                 */
                if (ts > now) {
                        event.seconds = ts - 
                                trace->event.trace_last_ts;
                        event.type = TRACE_EVENT_SLEEP;
                        return event;
                }
        } else {
                gettimeofday(&stv, NULL);
                /* work out the difference between the 
                 * start of trace replay, and the first
                 * packet in the trace
                 */
                trace->event.tdelta = stv.tv_sec + 
                        ((double)stv.tv_usec / 1000000.0);
                trace->event.tdelta -= ts;
        }

        /* This is the first packet, so just fire away. */
        /* TODO: finalise packet */
        *packet = *trace->event.packet;
        trace_destroy_packet(trace->event.packet);
        trace->event.packet = NULL;

        event.type = TRACE_EVENT_PACKET;

        trace->event.trace_last_ts = ts;

        return event;
}

/* Catch undefined O_LARGEFILE on *BSD etc */
#ifndef O_LARGEFILE
#  define O_LARGEFILE 0
#endif 

/* Catching O_BINARY on all sane OS's */
#ifndef O_BINARY
#  define O_BINARY 0
#endif

/* open a file or stdin using gzip compression if necessary (and supported)
 * @internal
 */
libtrace_io_t *trace_open_file(libtrace_t *trace)
{
        int fd;
        libtrace_io_t *ret;


        if (strcmp(trace->uridata,"-")==0) {
                ret=libtrace_io_fdopen(fileno(stdin),"rb");
                return ret;
        }

        /* We open the file with open(2), so we can provide O_LARGEFILE
         * as zlib doesn't always do it itself
         */
        fd=open(trace->uridata,O_LARGEFILE|O_RDONLY|O_BINARY);
        if (fd==-1) {
                trace_set_err(trace,errno,"Unable to open %s",trace->uridata);
                return 0;
        }
        ret=libtrace_io_fdopen(fd,"rb");
        return ret;
}

/* Create a file or write to stdout using compression if requested
 * @internal
 */
libtrace_io_t *trace_open_file_out(libtrace_out_t *trace,int level, int fileflag)
{
        int fd;
        libtrace_io_t *ret;
        char filemode[4]; /* wb9\0 */
        assert(level<10);
        assert(level>=0);
#ifdef HAVE_LIBZ
        snprintf(filemode,sizeof(filemode),"wb%d",level);
#else
        snprintf(filemode,sizeof(filemode),"wb");
#endif

        if (strcmp(trace->uridata,"-")==0) {
                ret=libtrace_io_fdopen(fileno(stdout),filemode);
                return ret;
        }

        /* We open the file with open(2), so we can provide O_LARGEFILE
         * as zlib doesn't always do it itself
         */
        fd=open(trace->uridata,fileflag|O_LARGEFILE|O_BINARY,0666);
        if (fd==-1) {
                trace_set_err_out(trace,
                                errno,"Unable to open %s",trace->uridata);
                return 0;
        }
        ret=libtrace_io_fdopen(fd,filemode);
        if (!ret) {
                printf("%s\n",filemode);
                trace_set_err_out(trace,
                                TRACE_ERR_INIT_FAILED,"gz out of memory");
        }
        return ret;
}


/** Update the libtrace error
 * @param errcode either an Econstant from libc, or a LIBTRACE_ERROR
 * @param msg a plaintext error message
 * @internal
 */
void trace_set_err(libtrace_t *trace,int errcode,const char *msg,...)
{
        char buf[256];
        va_list va;
        va_start(va,msg);
        assert(errcode != 0 && "An error occurred, but it is unknown what it is");
        trace->err.err_num=errcode;
        if (errcode>0) {
                vsnprintf(buf,sizeof(buf),msg,va);
                snprintf(trace->err.problem,sizeof(trace->err.problem),
                                "%s: %s",buf,strerror(errcode));
        } else {
                vsnprintf(trace->err.problem,sizeof(trace->err.problem),
                                msg,va);
        }
        va_end(va);
}

/** Update the libtrace for output traces error
 * @param errcode either an Econstant from libc, or a LIBTRACE_ERROR
 * @param msg a plaintext error message
 * @internal
 */
void trace_set_err_out(libtrace_out_t *trace,int errcode,const char *msg,...)
{
        char buf[256];
        va_list va;
        va_start(va,msg);
        assert(errcode != 0 && "An error occurred, but it is unknown what it is");
        trace->err.err_num=errcode;
        if (errcode>0) {
                vsnprintf(buf,sizeof(buf),msg,va);
                snprintf(trace->err.problem,sizeof(trace->err.problem),
                                "%s: %s",buf,strerror(errno));
        } else {
                vsnprintf(trace->err.problem,sizeof(trace->err.problem),
                                msg,va);
        }
        va_end(va);
}

uint64_t byteswap64(uint64_t num)
{
        return (byteswap32((num&0xFFFFFFFF00000000ULL)>>32))
              |((uint64_t)byteswap32(num&0x00000000FFFFFFFFULL)<<32);
}

uint32_t byteswap32(uint32_t num)
{
        return ((num&0x000000FFU)<<24)
                | ((num&0x0000FF00U)<<8)
                | ((num&0x00FF0000U)>>8)
                | ((num&0xFF000000U)>>24);
}

uint16_t byteswap16(uint16_t num)
{
        return ((num<<8)&0xFF00)|((num>>8)&0x00FF);
}