mirror of
https://github.com/dashpay/dash.git
synced 2024-12-25 03:52:49 +01:00
0dbafcee46
fa67b8181c3ecf94395ecc50fd8acd436f1f8c3a Refactor: Remove unused FlatFilePos::SetNull (MarcoFalke) Pull request description: This is unused outside of tests and the default constructor. With C++11, it can be replaced by C++11 member initializers in the default constructor. Beside removing unused code, this also makes it less fragile in light of uninitialized memory. (See also https://github.com/bitcoin/bitcoin/pull/26296#issuecomment-1477801767) If new code needs to set this to null, it can use `std::optional`, or in the worst case re-introduce this method. ACKs for top commit: dergoegge: Code review ACK fa67b8181c3ecf94395ecc50fd8acd436f1f8c3a TheCharlatan: ACK fa67b8181c3ecf94395ecc50fd8acd436f1f8c3a john-moffett: ACK fa67b8181c3ecf94395ecc50fd8acd436f1f8c3a Tree-SHA512: 465c5e3eb4625405c445695d33e09a1fc5185c7dd1e766ba06034fb093880bfc65441d5334f7d9b20e2e417c2075557d86059f59d9648ca0e62a54c699c029b9
93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
|
|
// Copyright (c) 2009-2020 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#ifndef BITCOIN_FLATFILE_H
|
|
#define BITCOIN_FLATFILE_H
|
|
|
|
#include <string>
|
|
|
|
#include <fs.h>
|
|
#include <serialize.h>
|
|
|
|
struct FlatFilePos
|
|
{
|
|
int nFile{-1};
|
|
unsigned int nPos{0};
|
|
|
|
SERIALIZE_METHODS(FlatFilePos, obj)
|
|
{
|
|
READWRITE(VARINT_MODE(obj.nFile, VarIntMode::NONNEGATIVE_SIGNED), VARINT(obj.nPos));
|
|
}
|
|
|
|
FlatFilePos() {}
|
|
|
|
FlatFilePos(int nFileIn, unsigned int nPosIn) :
|
|
nFile(nFileIn),
|
|
nPos(nPosIn)
|
|
{}
|
|
|
|
friend bool operator==(const FlatFilePos &a, const FlatFilePos &b) {
|
|
return (a.nFile == b.nFile && a.nPos == b.nPos);
|
|
}
|
|
|
|
friend bool operator!=(const FlatFilePos &a, const FlatFilePos &b) {
|
|
return !(a == b);
|
|
}
|
|
|
|
bool IsNull() const { return (nFile == -1); }
|
|
|
|
std::string ToString() const;
|
|
};
|
|
|
|
/**
|
|
* FlatFileSeq represents a sequence of numbered files storing raw data. This class facilitates
|
|
* access to and efficient management of these files.
|
|
*/
|
|
class FlatFileSeq
|
|
{
|
|
private:
|
|
const fs::path m_dir;
|
|
const char* const m_prefix;
|
|
const size_t m_chunk_size;
|
|
|
|
public:
|
|
/**
|
|
* Constructor
|
|
*
|
|
* @param dir The base directory that all files live in.
|
|
* @param prefix A short prefix given to all file names.
|
|
* @param chunk_size Disk space is pre-allocated in multiples of this amount.
|
|
*/
|
|
FlatFileSeq(fs::path dir, const char* prefix, size_t chunk_size);
|
|
|
|
/** Get the name of the file at the given position. */
|
|
fs::path FileName(const FlatFilePos& pos) const;
|
|
|
|
/** Open a handle to the file at the given position. */
|
|
FILE* Open(const FlatFilePos& pos, bool read_only = false);
|
|
|
|
/**
|
|
* Allocate additional space in a file after the given starting position. The amount allocated
|
|
* will be the minimum multiple of the sequence chunk size greater than add_size.
|
|
*
|
|
* @param[in] pos The starting position that bytes will be allocated after.
|
|
* @param[in] add_size The minimum number of bytes to be allocated.
|
|
* @param[out] out_of_space Whether the allocation failed due to insufficient disk space.
|
|
* @return The number of bytes successfully allocated.
|
|
*/
|
|
size_t Allocate(const FlatFilePos& pos, size_t add_size, bool& out_of_space);
|
|
|
|
/**
|
|
* Commit a file to disk, and optionally truncate off extra pre-allocated bytes if final.
|
|
*
|
|
* @param[in] pos The first unwritten position in the file to be flushed.
|
|
* @param[in] finalize True if no more data will be written to this file.
|
|
* @return true on success, false on failure.
|
|
*/
|
|
bool Flush(const FlatFilePos& pos, bool finalize = false);
|
|
};
|
|
|
|
#endif // BITCOIN_FLATFILE_H
|