10ff414c14
git-subtree-dir: contrib/libcbor git-subtree-mainline:293663f4dagit-subtree-split:5b2defbd2a
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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* Copyright (c) 2014-2020 Pavel Kalvoda <me@pavelkalvoda.com>
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*
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* libcbor is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <stdio.h>
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#include "cbor.h"
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void usage() {
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printf("Usage: readfile [input file]\n");
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exit(1);
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}
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/*
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* Reads data from a file. Example usage:
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* $ ./examples/readfile examples/data/nested_array.cbor
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*/
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int main(int argc, char* argv[]) {
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if (argc != 2) usage();
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FILE* f = fopen(argv[1], "rb");
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if (f == NULL) usage();
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fseek(f, 0, SEEK_END);
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size_t length = (size_t)ftell(f);
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fseek(f, 0, SEEK_SET);
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unsigned char* buffer = malloc(length);
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fread(buffer, length, 1, f);
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/* Assuming `buffer` contains `length` bytes of input data */
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struct cbor_load_result result;
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cbor_item_t* item = cbor_load(buffer, length, &result);
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if (result.error.code != CBOR_ERR_NONE) {
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printf(
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"There was an error while reading the input near byte %zu (read %zu "
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"bytes in total): ",
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result.error.position, result.read);
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switch (result.error.code) {
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case CBOR_ERR_MALFORMATED: {
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printf("Malformed data\n");
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break;
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}
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case CBOR_ERR_MEMERROR: {
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printf("Memory error -- perhaps the input is too large?\n");
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break;
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}
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case CBOR_ERR_NODATA: {
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printf("The input is empty\n");
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break;
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}
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case CBOR_ERR_NOTENOUGHDATA: {
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printf("Data seem to be missing -- is the input complete?\n");
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break;
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}
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case CBOR_ERR_SYNTAXERROR: {
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printf(
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"Syntactically malformed data -- see "
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"http://tools.ietf.org/html/rfc7049\n");
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break;
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}
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case CBOR_ERR_NONE: {
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// GCC's cheap dataflow analysis gag
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break;
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}
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}
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exit(1);
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}
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/* Pretty-print the result */
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cbor_describe(item, stdout);
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fflush(stdout);
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/* Deallocate the result */
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cbor_decref(&item);
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fclose(f);
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}
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