source: examples/skeleton/output.c @ d420777

/* An example program that demonstrates libtrace's output functionalities.
 *
 * This libtrace skeleton has the bare minimum required to write a useful
 * libtrace output program, including error handling.
 *
 */
#include "libtrace.h"
#include <stdio.h>
#include <assert.h>

static void per_packet(libtrace_packet_t *packet)
{
        assert(packet);
        /* Your code goes here */
}

int main(int argc, char *argv[])
{
        libtrace_t *trace;
        libtrace_out_t *output;
        libtrace_packet_t *packet;
        int compress_level = 6;
        
        if (argc<3) {
                fprintf(stderr,"usage: %s <input uri> <outputuri>\n",argv[0]);
                return 1;
        }

        trace = trace_create(argv[1]);

        if (trace_is_err(trace)) {
                trace_perror(trace,"Opening input trace");
                return 1;
        }

        if (trace_start(trace)) {
                trace_perror(trace,"Starting input trace");
                trace_destroy(trace);
                return 1;
        }

        /* Creating output trace */
        output = trace_create_output(argv[2]);
        
        if (trace_is_err_output(output)) {
                trace_perror_output(output, "Opening output trace");
                return 1;
        }

        /* Setting compression level */
        if (trace_config_output(output, TRACE_OPTION_OUTPUT_COMPRESS, 
                                &compress_level) == -1) {
                trace_perror_output(output, "Setting compression level");
                trace_destroy(trace);
                trace_destroy_output(output);
                return 1;
        }
        
        if (trace_start_output(output)) {
                trace_perror_output(output, "Starting output trace");
                trace_destroy_output(output);
                trace_destroy(trace);
                return 1;
        }
                
        packet = trace_create_packet();

        while (trace_read_packet(trace,packet)>0) {
                /* Perhaps we want to do something to the packet first */
                per_packet(packet);

                /* Write out the packet */
                if (trace_write_packet(output, packet) < 0) {
                        trace_perror_output(output, "Writing packet");
                        trace_destroy(trace);
                        trace_destroy_output(output);
                        trace_destroy_packet(packet);
                        return 1;
                }
                
        }
        

        if (trace_is_err(trace)) {
                trace_perror(trace,"Reading packets");
                trace_destroy(trace);
                trace_destroy_output(output);
                trace_destroy_packet(packet);
                return 1;
        }

        trace_destroy(trace);
        trace_destroy_output(output);
        trace_destroy_packet(packet);
        
        return 0;
}