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libipc-old/drop/cbor-examples/streaming-parser.c

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2016-09-15 23:08:08 +02:00
#include "cbor.h"
#include <stdio.h>
#include <string.h>
/*
* * Illustrates how one might skim through a map (which is assumed to have
* * string keys and values only), looking for the value of a specific key
* *
* * Use the examples/data/map.cbor input to test this.
* */
const char * key = "a secret key";
bool key_found = false;
void find_string(void * _ctx, cbor_data buffer, size_t len)
{
(void) _ctx;
if (key_found) {
printf("Found the value: %*s\n", (int) len, buffer);
key_found = false;
} else if (len == strlen(key)) {
key_found = (memcmp(key, buffer, len) == 0);
}
}
int main(int argc, char * argv[])
{
(void) argc;
(void) argv;
FILE * f = fopen(argv[1], "rb");
fseek(f, 0, SEEK_END);
size_t length = (size_t)ftell(f);
fseek(f, 0, SEEK_SET);
unsigned char * buffer = malloc(length);
fread(buffer, length, 1, f);
struct cbor_callbacks callbacks = cbor_empty_callbacks;
struct cbor_decoder_result decode_result;
size_t bytes_read = 0;
callbacks.string = find_string;
while (bytes_read < length) {
decode_result = cbor_stream_decode(buffer + bytes_read,
length - bytes_read,
&callbacks, NULL);
bytes_read += decode_result.read;
}
fclose(f);
}