1// Copyright (c) 2015-present The Bitcoin Core developers
2// Copyright (c) 2017 The Zcash developers
3// Distributed under the MIT software license, see the accompanying
4// file COPYING or http://www.opensource.org/licenses/mit-license.php.
5
6#include <util/readwritefile.h>
7
8#include <util/fs.h>
9
10#include <algorithm>
11#include <cstdio>
12#include <string>
13#include <utility>
14
15std::pair<bool,std::string> ReadBinaryFile(const fs::path &filename, size_t maxsize)
16{
17    FILE *f = fsbridge::fopen(filename, "rb");
18    if (f == nullptr)
19        return std::make_pair(false,"");
20    std::string retval;
21    char buffer[128];
22    do {
23        const size_t n = fread(buffer, 1, std::min(sizeof(buffer), maxsize - retval.size()), f);
24        // Check for reading errors so we don't return any data if we couldn't
25        // read the entire file (or up to maxsize)
26        if (ferror(f)) {
27            fclose(f);
28            return std::make_pair(false,"");
29        }
30        retval.append(buffer, buffer+n);
31    } while (!feof(f) && retval.size() < maxsize);
32    fclose(f);
33    return std::make_pair(true,retval);
34}
35
36bool WriteBinaryFile(const fs::path &filename, const std::string &data)
37{
38    FILE *f = fsbridge::fopen(filename, "wb");
39    if (f == nullptr)
40        return false;
41    if (fwrite(data.data(), 1, data.size(), f) != data.size()) {
42        fclose(f);
43        return false;
44    }
45    if (fclose(f) != 0) {
46        return false;
47    }
48    return true;
49}
50