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/*
* Copyright (c) 2018 Vasile Vilvoiu <vasi.vilvoiu@gmail.com>
*
* libecbor is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <malloc.h>
#include <ecbor.h>
/*
* Command line arguments
*/
static struct option long_options[] = {
{ "help", no_argument, 0, 'h' },
{ 0, 0, 0, 0 }
};
void print_help (void);
void print_ecbor_error (ecbor_error_t err);
ecbor_error_t print_ecbor_item (ecbor_item_t *item, int level);
/*
* Print help
*/
void
print_help (void)
{
printf ("Usage: ecbor-describe [options] <filename>\n");
printf (" options:\n");
printf (" -h, --help Display this help message\n");
}
void
print_ecbor_error (ecbor_error_t err)
{
printf ("ECBOR error %d\n", err);
}
ecbor_error_t
print_ecbor_item (ecbor_item_t *item, int level)
{
ecbor_major_type_t mt;
ecbor_error_t rc;
int i;
for(i = 0; i < level * 2; i ++) putchar(' ');
mt = ecbor_get_type (item);
switch (mt) {
case ECBOR_MT_NINT:
{
int64_t val;
rc = ecbor_get_value (item, (void *) &val);
if (rc != ECBOR_OK) {
print_ecbor_error (rc);
return rc;
}
printf ("[NINT] value %d\n", (int)val);
}
break;
case ECBOR_MT_UINT:
{
uint64_t val;
rc = ecbor_get_value (item, (void *) &val);
if (rc != ECBOR_OK) {
print_ecbor_error (rc);
return rc;
}
printf ("[UINT] value %u\n", (unsigned int) val);
}
break;
case ECBOR_MT_ARRAY:
{
uint64_t len, i;
rc = ecbor_get_length (item, &len);
if (rc != ECBOR_OK) {
print_ecbor_error (rc);
return rc;
}
printf ("[ARRAY] len %u\n", (unsigned int) len);
for (i = 0; i < len; i ++) {
ecbor_item_t child;
rc = ecbor_get_array_item (item, i, &child);
if (rc != ECBOR_OK) {
print_ecbor_error (rc);
return rc;
}
print_ecbor_item (&child, level+1);
}
}
break;
default:
printf ("[UNKNOWN]\n");
break;
}
return ECBOR_OK;
}
/*
* Program entry
*/
int
main(int argc, char **argv)
{
char *filename = NULL;
unsigned char *cbor = NULL;
long int cbor_length = 0;
/* parse arguments */
while (1) {
int option_index, c;
c = getopt_long (argc, argv, "h", long_options, &option_index);
if (c == -1) {
break;
}
switch (c) {
default:
print_help ();
return 0;
}
}
if (optind != (argc-1)) {
printf ("Expecting exactly one file name!\n");
print_help ();
return -1;
} else {
filename = strdup (argv[optind]);
}
/* load CBOR data from file */
{
FILE *fp;
printf ("Reading CBOR from file '%s'\n", filename);
fp = fopen (filename, "rb");
if (!fp) {
printf ("Error opening file!\n");
return -1;
}
if (fseek (fp, 0L, SEEK_END)) {
printf ("Error seeking end of file!\n");
fclose (fp);
return -1;
}
cbor_length = ftell(fp);
if (cbor_length < 0) {
printf ("Error determining input size!\n");
fclose (fp);
return -1;
}
if (fseek (fp, 0L, SEEK_SET)) {
printf ("Error seeking beginning of file!\n");
fclose (fp);
return -1;
}
cbor = (unsigned char *) malloc (cbor_length);
if (!cbor) {
printf ("Error allocating %d bytes!\n", (int) cbor_length);
fclose (fp);
return -1;
}
if (fread (cbor, 1, cbor_length, fp) != (size_t) cbor_length) {
printf ("Error reading %d bytes!\n", (int) cbor_length);
fclose (fp);
return -1;
}
fclose (fp);
free (filename);
}
/* parse CBOR data */
{
ecbor_decode_context_t context;
ecbor_item_t item;
ecbor_error_t rc;
rc = ecbor_initialize_decode (&context, cbor, cbor_length);
if (rc != ECBOR_OK) {
print_ecbor_error (rc);
return -1;
}
printf ("CBOR objects:\n");
while (1) {
rc = ecbor_decode (&context, &item);
if (rc != ECBOR_OK) {
if (rc == ECBOR_END_OF_BUFFER) {
break;
}
print_ecbor_error (rc);
return -1;
}
print_ecbor_item (&item, 0);
}
}
free (cbor);
/* all ok */
return 0;
}
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