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LEFTONE/util/mpkutil/file.c
falsycat 84c3a02b9a [RELEASE] u22-v03
This version is submitted to U22 breau.
2020-09-14 00:00:00 +00:00

59 lines
1.4 KiB
C

#include "./file.h"
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <msgpack.h>
bool mpkutil_file_unpack_with_unpacker(
msgpack_unpacked* obj,
FILE* fp,
msgpack_unpacker* unpacker) {
assert(obj != NULL);
assert(fp != NULL);
assert(unpacker != NULL);
for (;;) {
if (feof(fp)) return false;
const size_t maxlen = msgpack_unpacker_buffer_capacity(unpacker);
if (maxlen == 0) {
fprintf(stderr, "unpacker buffer overflow\n");
abort();
}
const size_t len = fread(
msgpack_unpacker_buffer(unpacker), 1, maxlen, fp);
if (ferror(fp)) return false;
msgpack_unpacker_buffer_consumed(unpacker, len);
size_t parsed_len;
switch (msgpack_unpacker_next_with_size(unpacker, obj, &parsed_len)) {
case MSGPACK_UNPACK_SUCCESS:
return fseek(fp, (long) parsed_len - len, SEEK_CUR) == 0;
case MSGPACK_UNPACK_CONTINUE:
break;
case MSGPACK_UNPACK_PARSE_ERROR:
default:
return false;
}
}
}
bool mpkutil_file_unpack(msgpack_unpacked* obj, FILE* fp) {
assert(fp != NULL);
assert(obj != NULL);
msgpack_unpacker unpacker;
if (!msgpack_unpacker_init(&unpacker, 1024)) return false;
const bool result = mpkutil_file_unpack_with_unpacker(obj, fp, &unpacker);
msgpack_unpacker_destroy(&unpacker);
return result;
}