git / moonbite-core / src/flatfile.cpp · raw

// Copyright (c) 2009-2010 Satoshi Nakamoto// Copyright (c) 2009-2019 The Bitcoin Core developers// Distributed under the MIT software license, see the accompanying// file COPYING or http://www.opensource.org/licenses/mit-license.php.#include <stdexcept>#include <flatfile.h>#include <logging.h>#include <tinyformat.h>#include <util/system.h>FlatFileSeq::FlatFileSeq(fs::path dir, const char* prefix, size_t chunk_size) :    m_dir(std::move(dir)),    m_prefix(prefix),    m_chunk_size(chunk_size){    if (chunk_size == 0) {        throw std::invalid_argument("chunk_size must be positive");    }}std::string FlatFilePos::ToString() const{    return strprintf("FlatFilePos(nFile=%i, nPos=%i)", nFile, nPos);}fs::path FlatFileSeq::FileName(const FlatFilePos& pos) const{    return m_dir / strprintf("%s%05u.dat", m_prefix, pos.nFile);}FILE* FlatFileSeq::Open(const FlatFilePos& pos, bool read_only){    if (pos.IsNull()) {        return nullptr;    }    fs::path path = FileName(pos);    fs::create_directories(path.parent_path());    FILE* file = fsbridge::fopen(path, read_only ? "rb": "rb+");    if (!file && !read_only)        file = fsbridge::fopen(path, "wb+");    if (!file) {        LogPrintf("Unable to open file %s\n", path.string());        return nullptr;    }    if (pos.nPos && fseek(file, pos.nPos, SEEK_SET)) {        LogPrintf("Unable to seek to position %u of %s\n", pos.nPos, path.string());        fclose(file);        return nullptr;    }    return file;}size_t FlatFileSeq::Allocate(const FlatFilePos& pos, size_t add_size, bool& out_of_space){    out_of_space = false;    unsigned int n_old_chunks = (pos.nPos + m_chunk_size - 1) / m_chunk_size;    unsigned int n_new_chunks = (pos.nPos + add_size + m_chunk_size - 1) / m_chunk_size;    if (n_new_chunks > n_old_chunks) {        size_t old_size = pos.nPos;        size_t new_size = n_new_chunks * m_chunk_size;        size_t inc_size = new_size - old_size;        if (CheckDiskSpace(m_dir, inc_size)) {            FILE *file = Open(pos);            if (file) {                LogPrintf("Pre-allocating up to position 0x%x in %s%05u.dat\n", new_size, m_prefix, pos.nFile);                AllocateFileRange(file, pos.nPos, inc_size);                fclose(file);                return inc_size;            }        } else {            out_of_space = true;        }    }    return 0;}bool FlatFileSeq::Flush(const FlatFilePos& pos, bool finalize){    FILE* file = Open(FlatFilePos(pos.nFile, 0)); // Avoid fseek to nPos    if (!file) {        return error("%s: failed to open file %d", __func__, pos.nFile);    }    if (finalize && !TruncateFile(file, pos.nPos)) {        fclose(file);        return error("%s: failed to truncate file %d", __func__, pos.nFile);    }    if (!FileCommit(file)) {        fclose(file);        return error("%s: failed to commit file %d", __func__, pos.nFile);    }    fclose(file);    return true;}