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kcfile.cc
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kcfile.cc
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/*************************************************************************************************
* Filesystem abstraction
* Copyright (C) 2009-2012 FAL Labs
* Copyright (C) 2013-2017 Cloudflare Inc.
* Copyright (C) 2018-2019 TrustYou GmbH
* This file is part of Kyoto Cabinet.
* This program is free software: you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation, either version
* 3 of the License, or any later version.
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*************************************************************************************************/
#include "kcfile.h"
#include "myconf.h"
namespace kyotocabinet { // common namespace
/**
* Constants for implementation.
*/
namespace {
const int32_t FILEPERM = 00644; ///< default permission of a new file
const int32_t DIRPERM = 00755; ///< default permission of a new directory
const int32_t PATHBUFSIZ = 8192; ///< size of the path buffer
const int32_t IOBUFSIZ = 16384; ///< size of the IO buffer
const int64_t FILEMAXSIZ = INT64MAX - INT32MAX; // maximum size of a file
const char* const WALPATHEXT = "wal"; ///< extension of the WAL file
const char WALMAGICDATA[] = "KW\n"; ///< magic data of the WAL file
const uint8_t WALMSGMAGIC = 0xee; ///< magic data for WAL record
}
/**
* File internal.
*/
struct FileCore {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
Mutex alock; ///< attribute lock
TSDKey errmsg; ///< error message
::HANDLE fh; ///< file handle
::HANDLE mh; ///< map view handle
char* map; ///< mapped memory
int64_t msiz; ///< map size
int64_t lsiz; ///< logical size
int64_t psiz; ///< physical size
std::string path; ///< file path
bool recov; ///< flag of recovery
uint32_t omode; ///< open mode
::HANDLE walfh; ///< file handle for WAL
int64_t walsiz; ///< size of WAL
bool tran; ///< whether in transaction
bool trhard; ///< whether hard transaction
int64_t trbase; ///< base offset of guarded region
int64_t trmsiz; ///< minimum size during transaction
#else
Mutex alock; ///< attribute lock
TSDKey errmsg; ///< error message
int32_t fd; ///< file descriptor
char* map; ///< mapped memory
int64_t msiz; ///< map size
int64_t lsiz; ///< logical size
int64_t psiz; ///< physical size
std::string path; ///< file path
bool recov; ///< flag of recovery
uint32_t omode; ///< open mode
int32_t walfd; ///< file descriptor for WAL
int64_t walsiz; ///< size of WAL
bool tran; ///< whether in transaction
bool trhard; ///< whether hard transaction
int64_t trbase; ///< base offset of guarded region
int64_t trmsiz; ///< minimum size during transaction
#endif
};
/**
* WAL message.
*/
struct WALMessage {
int64_t off; ///< offset of the region
std::string body; ///< body data
};
/**
* DirStream internal.
*/
struct DirStreamCore {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
Mutex alock; ///< attribute lock
::HANDLE dh; ///< directory handle
std::string cur; ///< current file
#else
Mutex alock; ///< attribute lock
::DIR* dh; ///< directory handle
#endif
};
/**
* Set the error message.
* @param core the inner condition.
* @param msg the error message.
*/
static void seterrmsg(FileCore* core, const char* msg);
/**
* Get the path of the WAL file.
* @param path the path of the destination file.
* @return the path of the WAL file.
*/
static std::string walpath(const std::string& path);
/**
* Write a log message into the WAL file.
* @param core the inner condition.
* @param off the offset of the destination.
* @param size the size of the data region.
* @param base the base offset.
* @return true on success, or false on failure.
*/
static bool walwrite(FileCore *core, int64_t off, size_t size, int64_t base);
/**
* Apply log messages in the WAL file.
* @param core the inner condition.
* @return true on success, or false on failure.
*/
static bool walapply(FileCore* core);
/**
* Write data into a file.
* @param fd the file descriptor.
* @param off the offset of the destination.
* @param buf the pointer to the data region.
* @param size the size of the data region.
* @return true on success, or false on failure.
*/
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
static bool mywrite(::HANDLE fh, int64_t off, const void* buf, size_t size);
#else
static bool mywrite(int32_t fd, int64_t off, const void* buf, size_t size);
#endif
/**
* Read data from a file.
* @param fd the file descriptor.
* @param buf the pointer to the destination region.
* @param size the size of the data to be read.
* @return true on success, or false on failure.
*/
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
static size_t myread(::HANDLE fh, void* buf, size_t size);
#else
static size_t myread(int32_t fd, void* buf, size_t count);
#endif
/**
* System call emulation for Win32.
*/
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
static int64_t win_pwrite(::HANDLE fh, const void* buf, size_t count, int64_t offset);
static int64_t win_pread(::HANDLE fh, void* buf, size_t count, int64_t offset);
static int64_t win_write(::HANDLE fh, const void* buf, size_t count);
static int64_t win_read(::HANDLE fh, void* buf, size_t count);
static int32_t win_ftruncate(::HANDLE fh, int64_t length);
#endif
/** Path delimiter character. */
const char File::PATHCHR = MYPATHCHR;
/** Path delimiter string. */
const char* const File::PATHSTR = MYPATHSTR;
/** Extension delimiter character. */
const char File::EXTCHR = MYEXTCHR;
/** Extension delimiter string. */
const char* const File::EXTSTR = MYEXTSTR;
/** Current directory string. */
const char* const File::CDIRSTR = MYCDIRSTR;
/** Parent directory string. */
const char* const File::PDIRSTR = MYPDIRSTR;
/**
* Default constructor.
*/
File::File() : opq_(NULL) {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(true);
FileCore* core = new FileCore;
core->fh = NULL;
core->mh = NULL;
core->map = NULL;
core->msiz = 0;
core->lsiz = 0;
core->psiz = 0;
core->recov = false;
core->omode = 0;
core->walfh = NULL;
core->walsiz = 0;
core->tran = false;
core->trhard = false;
core->trmsiz = 0;
opq_ = core;
#else
_assert_(true);
FileCore* core = new FileCore;
core->fd = -1;
core->map = NULL;
core->msiz = 0;
core->lsiz = 0;
core->psiz = 0;
core->recov = false;
core->omode = 0;
core->walfd = -1;
core->walsiz = 0;
core->tran = false;
core->trhard = false;
core->trmsiz = 0;
opq_ = core;
#endif
}
/**
* Destructor.
*/
File::~File() {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(true);
FileCore* core = (FileCore*)opq_;
if (core->fh) close();
delete core;
#else
_assert_(true);
FileCore* core = (FileCore*)opq_;
if (core->fd >= 0) close();
delete core;
#endif
}
/**
* Get the last happened error information.
*/
const char* File::error() const {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(true);
FileCore* core = (FileCore*)opq_;
const char* msg = (const char*)core->errmsg.get();
if (!msg) msg = "no error";
return msg;
#else
_assert_(true);
FileCore* core = (FileCore*)opq_;
const char* msg = (const char*)core->errmsg.get();
if (!msg) msg = "no error";
return msg;
#endif
}
/**
* Open a file.
*/
bool File::open(const std::string& path, uint32_t mode, int64_t msiz) {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(msiz >= 0 && msiz <= FILEMAXSIZ);
FileCore* core = (FileCore*)opq_;
::DWORD amode = GENERIC_READ;
::DWORD smode = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
::DWORD cmode = OPEN_EXISTING;
if (mode & OWRITER) {
amode |= GENERIC_WRITE;
if (mode & OCREATE) {
cmode = OPEN_ALWAYS;
if (mode & OTRUNCATE) cmode = CREATE_ALWAYS;
} else {
if (mode & OTRUNCATE) cmode = TRUNCATE_EXISTING;
}
}
::HANDLE fh = ::CreateFile(path.c_str(), amode, smode, NULL, cmode,
FILE_ATTRIBUTE_NORMAL, NULL);
if (!fh || fh == INVALID_HANDLE_VALUE) {
seterrmsg(core, "CreateFile failed");
return false;
}
if (!(mode & ONOLOCK)) {
::DWORD lmode = mode & OWRITER ? LOCKFILE_EXCLUSIVE_LOCK : 0;
if (mode & OTRYLOCK) lmode |= LOCKFILE_FAIL_IMMEDIATELY;
OVERLAPPED ol;
ol.Offset = INT32MAX;
ol.OffsetHigh = 0;
ol.hEvent = 0;
if (!::LockFileEx(fh, lmode, 0, 1, 0, &ol)) {
seterrmsg(core, "LockFileEx failed");
::CloseHandle(fh);
return false;
}
}
::LARGE_INTEGER sbuf;
if (!::GetFileSizeEx(fh, &sbuf)) {
seterrmsg(core, "GetFileSizeEx failed");
::CloseHandle(fh);
return false;
}
bool recov = false;
if ((!(mode & OWRITER) || !(mode & OTRUNCATE)) && !(mode & ONOLOCK)) {
const std::string& wpath = walpath(path);
::HANDLE walfh = ::CreateFile(wpath.c_str(), GENERIC_READ, 0, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
if (walfh && walfh != INVALID_HANDLE_VALUE) {
recov = true;
::LARGE_INTEGER li;
if (::GetFileSizeEx(walfh, &li) && li.QuadPart >= (int64_t)sizeof(WALMAGICDATA)) {
char mbuf[sizeof(WALMAGICDATA)];
if (myread(walfh, mbuf, sizeof(mbuf)) &&
!std::memcmp(mbuf, WALMAGICDATA, sizeof(WALMAGICDATA))) {
::HANDLE ofh = fh;
if (!(mode & OWRITER)) ofh = ::CreateFile(wpath.c_str(), GENERIC_WRITE, 0, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (ofh && ofh != INVALID_HANDLE_VALUE) {
core->fh = ofh;
core->walfh = walfh;
walapply(core);
if (ofh != fh && !::CloseHandle(ofh)) seterrmsg(core, "CloseHandle failed");
li.QuadPart = 0;
if (win_ftruncate(walfh, 0) != 0) seterrmsg(core, "win_ftruncate failed");
core->fh = NULL;
core->walfh = NULL;
if (!::GetFileSizeEx(fh, &sbuf)) {
seterrmsg(core, "GetFileSizeEx failed");
::CloseHandle(fh);
return false;
}
} else {
seterrmsg(core, "CreateFile failed");
}
}
}
if (!::CloseHandle(walfh)) seterrmsg(core, "CloseHandle failed");
::DeleteFile(wpath.c_str());
}
}
int64_t lsiz = sbuf.QuadPart;
int64_t psiz = lsiz;
int64_t diff = msiz % PAGESIZ;
if (diff > 0) msiz += PAGESIZ - diff;
::DWORD mprot = PAGE_READONLY;
::DWORD vmode = FILE_MAP_READ;
if (mode & OWRITER) {
mprot = PAGE_READWRITE;
vmode = FILE_MAP_WRITE;
} else if (msiz > lsiz) {
msiz = lsiz;
}
sbuf.QuadPart = msiz;
::HANDLE mh = NULL;
void* map = NULL;
if (msiz > 0) {
mh = ::CreateFileMapping(fh, NULL, mprot, sbuf.HighPart, sbuf.LowPart, NULL);
if (!mh || mh == INVALID_HANDLE_VALUE) {
seterrmsg(core, "CreateFileMapping failed");
::CloseHandle(fh);
return false;
}
map = ::MapViewOfFile(mh, vmode, 0, 0, 0);
if (!map) {
seterrmsg(core, "MapViewOfFile failed");
::CloseHandle(mh);
::CloseHandle(fh);
return false;
}
if (psiz < msiz) psiz = msiz;
}
core->fh = fh;
core->mh = mh;
core->map = (char*)map;
core->msiz = msiz;
core->lsiz = lsiz;
core->psiz = psiz;
core->recov = recov;
core->omode = mode;
core->path.append(path);
return true;
#else
_assert_(msiz >= 0 && msiz <= FILEMAXSIZ);
FileCore* core = (FileCore*)opq_;
int32_t oflags = O_RDONLY;
if (mode & OWRITER) {
oflags = O_RDWR;
if (mode & OCREATE) oflags |= O_CREAT;
if (mode & OTRUNCATE) oflags |= O_TRUNC;
}
int32_t fd = ::open(path.c_str(), oflags, FILEPERM);
if (fd < 0) {
switch (errno) {
case EACCES:
seterrmsg(core, "open failed (permission denied)");
break;
case EISDIR:
seterrmsg(core, "open failed (directory)");
break;
case ENOENT:
seterrmsg(core, "open failed (file not found)");
break;
case ENOTDIR:
seterrmsg(core, "open failed (invalid path)");
break;
case ENOSPC:
seterrmsg(core, "open failed (no space)");
break;
default:
seterrmsg(core, "open failed");
break;
}
return false;
}
if (!(mode & ONOLOCK)) {
struct flock flbuf;
std::memset(&flbuf, 0, sizeof(flbuf));
flbuf.l_type = mode & OWRITER ? F_WRLCK : F_RDLCK;
flbuf.l_whence = SEEK_SET;
flbuf.l_start = 0;
flbuf.l_len = 0;
flbuf.l_pid = 0;
int32_t cmd = mode & OTRYLOCK ? F_SETLK : F_SETLKW;
while (::fcntl(fd, cmd, &flbuf) != 0) {
if (errno != EINTR) {
seterrmsg(core, "fcntl failed");
::close(fd);
return false;
}
}
}
struct ::stat sbuf;
if (::fstat(fd, &sbuf) != 0) {
seterrmsg(core, "fstat failed");
::close(fd);
return false;
}
if (!S_ISREG(sbuf.st_mode)) {
seterrmsg(core, "not a regular file");
::close(fd);
return false;
}
bool recov = false;
if ((!(mode & OWRITER) || !(mode & OTRUNCATE)) && !(mode & ONOLOCK)) {
const std::string& wpath = walpath(path);
int32_t walfd = ::open(wpath.c_str(), O_RDWR, FILEPERM);
if (walfd >= 0) {
struct ::stat wsbuf;
if (::fstat(walfd, &wsbuf) == 0 && wsbuf.st_uid == sbuf.st_uid) {
recov = true;
if (wsbuf.st_size >= (int64_t)sizeof(WALMAGICDATA)) {
char mbuf[sizeof(WALMAGICDATA)];
if (myread(walfd, mbuf, sizeof(mbuf)) &&
!std::memcmp(mbuf, WALMAGICDATA, sizeof(WALMAGICDATA))) {
int32_t ofd = mode & OWRITER ? fd : ::open(path.c_str(), O_WRONLY, FILEPERM);
if (ofd >= 0) {
core->fd = ofd;
core->walfd = walfd;
walapply(core);
if (ofd != fd && ::close(ofd) != 0) seterrmsg(core, "close failed");
if (::ftruncate(walfd, 0) != 0) seterrmsg(core, "ftruncate failed");
core->fd = -1;
core->walfd = -1;
if (::fstat(fd, &sbuf) != 0) {
seterrmsg(core, "fstat failed");
::close(fd);
return false;
}
} else {
seterrmsg(core, "open failed");
}
}
}
}
if (::close(walfd) != 0) seterrmsg(core, "close failed");
if (::unlink(wpath.c_str()) != 0) seterrmsg(core, "unlink failed");
}
}
int64_t lsiz = sbuf.st_size;
int64_t psiz = lsiz;
int64_t diff = msiz % PAGESIZ;
if (diff > 0) msiz += PAGESIZ - diff;
int32_t mprot = PROT_READ;
if (mode & OWRITER) {
mprot |= PROT_WRITE;
} else if (msiz > lsiz) {
msiz = lsiz;
}
void* map = NULL;
if (msiz > 0) {
map = ::mmap(0, msiz, mprot, MAP_SHARED, fd, 0);
if (map == MAP_FAILED) {
seterrmsg(core, "mmap failed");
::close(fd);
return false;
}
}
core->fd = fd;
core->map = (char*)map;
core->msiz = msiz;
core->lsiz = lsiz;
core->psiz = psiz;
core->recov = recov;
core->omode = mode;
core->path.append(path);
return true;
#endif
}
/**
* Close the file.
*/
bool File::close() {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(true);
FileCore* core = (FileCore*)opq_;
bool err = false;
if (core->tran && !end_transaction(false)) err = true;
if (core->walfh) {
if (!::CloseHandle(core->walfh)) {
seterrmsg(core, "CloseHandle failed");
err = true;
}
const std::string& wpath = walpath(core->path);
::DeleteFile(wpath.c_str());
}
if (core->msiz > 0) {
if (!::UnmapViewOfFile(core->map)) {
seterrmsg(core, "UnmapViewOfFile failed");
err = true;
}
if (!::CloseHandle(core->mh)) {
seterrmsg(core, "CloseHandle failed");
err = true;
}
}
::LARGE_INTEGER li;
if (::GetFileSizeEx(core->fh, &li)) {
if ((li.QuadPart != core->lsiz || core->psiz != core->lsiz) &&
win_ftruncate(core->fh, core->lsiz) != 0) {
seterrmsg(core, "win_ftruncate failed");
err = true;
}
} else {
seterrmsg(core, "GetFileSizeEx failed");
err = true;
}
if (!(core->omode & ONOLOCK)) {
OVERLAPPED ol;
ol.Offset = INT32MAX;
ol.OffsetHigh = 0;
ol.hEvent = 0;
if (!::UnlockFileEx(core->fh, 0, 1, 0, &ol)) {
seterrmsg(core, "UnlockFileEx failed");
err = true;
}
}
if (!::CloseHandle(core->fh)) {
seterrmsg(core, "CloseHandle failed");
err = true;
}
core->fh = NULL;
core->mh = NULL;
core->map = NULL;
core->msiz = 0;
core->lsiz = 0;
core->psiz = 0;
core->path.clear();
core->walfh = NULL;
core->walsiz = 0;
core->tran = false;
core->trhard = false;
core->trmsiz = 0;
return !err;
#else
_assert_(true);
FileCore* core = (FileCore*)opq_;
bool err = false;
if (core->tran && !end_transaction(false)) err = true;
if (core->walfd >= 0) {
if (::close(core->walfd) != 0) {
seterrmsg(core, "close failed");
err = true;
}
const std::string& wpath = walpath(core->path);
struct ::stat sbuf;
if (::lstat(wpath.c_str(), &sbuf) == 0 && S_ISREG(sbuf.st_mode) &&
::unlink(wpath.c_str()) != 0) {
seterrmsg(core, "unlink failed");
err = true;
}
}
if (core->msiz > 0 && ::munmap(core->map, core->msiz) != 0) {
seterrmsg(core, "munmap failed");
err = true;
}
if (core->psiz != core->lsiz && ::ftruncate(core->fd, core->lsiz) != 0) {
seterrmsg(core, "ftruncate failed");
err = true;
}
if (!(core->omode & ONOLOCK)) {
struct flock flbuf;
std::memset(&flbuf, 0, sizeof(flbuf));
flbuf.l_type = F_UNLCK;
flbuf.l_whence = SEEK_SET;
flbuf.l_start = 0;
flbuf.l_len = 0;
flbuf.l_pid = 0;
while (::fcntl(core->fd, F_SETLKW, &flbuf) != 0) {
if (errno != EINTR) {
seterrmsg(core, "fcntl failed");
err = true;
break;
}
}
}
if (::close(core->fd) != 0) {
seterrmsg(core, "close failed");
err = true;
}
core->fd = -1;
core->map = NULL;
core->msiz = 0;
core->lsiz = 0;
core->psiz = 0;
core->path.clear();
core->walfd = -1;
core->walsiz = 0;
core->tran = false;
core->trhard = false;
core->trmsiz = 0;
return !err;
#endif
}
/**
* Write data.
*/
bool File::write(int64_t off, const void* buf, size_t size) {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(off >= 0 && off <= FILEMAXSIZ && buf && size <= MEMMAXSIZ);
if (size < 1) return true;
FileCore* core = (FileCore*)opq_;
if (core->tran && !walwrite(core, off, size, core->trbase)) return false;
int64_t end = off + size;
core->alock.lock();
if (end <= core->msiz) {
if (end > core->psiz) {
int64_t psiz = end + core->psiz / 2;
int64_t diff = psiz % PAGESIZ;
if (diff > 0) psiz += PAGESIZ - diff;
if (psiz > core->msiz) psiz = core->msiz;
if (win_ftruncate(core->fh, psiz) != 0) {
seterrmsg(core, "win_ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = psiz;
}
if (end > core->lsiz) core->lsiz = end;
core->alock.unlock();
std::memcpy(core->map + off, buf, size);
return true;
}
if (off < core->msiz) {
if (end > core->psiz) {
if (win_ftruncate(core->fh, end) != 0) {
seterrmsg(core, "win_ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = end;
}
size_t hsiz = core->msiz - off;
std::memcpy(core->map + off, buf, hsiz);
off += hsiz;
buf = (char*)buf + hsiz;
size -= hsiz;
}
if (end > core->lsiz) core->lsiz = end;
if (end > core->psiz) {
if (core->psiz < core->msiz && win_ftruncate(core->fh, core->msiz) != 0) {
seterrmsg(core, "win_ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = end;
}
core->alock.unlock();
if (!mywrite(core->fh, off, buf, size)) {
seterrmsg(core, "mywrite failed");
return false;
}
return true;
#else
_assert_(off >= 0 && off <= FILEMAXSIZ && buf && size <= MEMMAXSIZ);
if (size < 1) return true;
FileCore* core = (FileCore*)opq_;
if (core->tran && !walwrite(core, off, size, core->trbase)) return false;
int64_t end = off + size;
core->alock.lock();
if (end <= core->msiz) {
if (end > core->psiz) {
int64_t psiz = end + core->psiz / 2;
int64_t diff = psiz % PAGESIZ;
if (diff > 0) psiz += PAGESIZ - diff;
if (psiz > core->msiz) psiz = core->msiz;
if (::ftruncate(core->fd, psiz) != 0) {
seterrmsg(core, "ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = psiz;
}
if (end > core->lsiz) core->lsiz = end;
core->alock.unlock();
std::memcpy(core->map + off, buf, size);
return true;
}
if (off < core->msiz) {
if (end > core->psiz) {
if (::ftruncate(core->fd, end) != 0) {
seterrmsg(core, "ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = end;
}
size_t hsiz = core->msiz - off;
std::memcpy(core->map + off, buf, hsiz);
off += hsiz;
buf = (char*)buf + hsiz;
size -= hsiz;
}
if (end > core->lsiz) core->lsiz = end;
if (end > core->psiz) {
if (core->psiz < core->msiz && ::ftruncate(core->fd, core->msiz) != 0) {
seterrmsg(core, "ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = end;
}
core->alock.unlock();
if (!mywrite(core->fd, off, buf, size)) {
seterrmsg(core, "mywrite failed");
return false;
}
return true;
#endif
}
/**
* Write data with assuring the region does not spill from the file size.
*/
bool File::write_fast(int64_t off, const void* buf, size_t size) {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(off >= 0 && off <= FILEMAXSIZ && buf && size <= MEMMAXSIZ);
FileCore* core = (FileCore*)opq_;
if (core->tran && !walwrite(core, off, size, core->trbase)) return false;
int64_t end = off + size;
if (end <= core->msiz) {
std::memcpy(core->map + off, buf, size);
return true;
}
if (off < core->msiz) {
size_t hsiz = core->msiz - off;
std::memcpy(core->map + off, buf, hsiz);
off += hsiz;
buf = (char*)buf + hsiz;
size -= hsiz;
}
if (!mywrite(core->fh, off, buf, size)) {
seterrmsg(core, "mywrite failed");
return false;
}
return true;
#else
_assert_(off >= 0 && off <= FILEMAXSIZ && buf && size <= MEMMAXSIZ);
FileCore* core = (FileCore*)opq_;
if (core->tran && !walwrite(core, off, size, core->trbase)) return false;
int64_t end = off + size;
if (end <= core->msiz) {
std::memcpy(core->map + off, buf, size);
return true;
}
if (off < core->msiz) {
size_t hsiz = core->msiz - off;
std::memcpy(core->map + off, buf, hsiz);
off += hsiz;
buf = (char*)buf + hsiz;
size -= hsiz;
}
if (!mywrite(core->fd, off, buf, size)) {
seterrmsg(core, "mywrite failed");
return false;
}
return true;
#endif
}
/**
* Write data at the end of the file.
*/
bool File::append(const void* buf, size_t size) {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(buf && size <= MEMMAXSIZ);
if (size < 1) return true;
FileCore* core = (FileCore*)opq_;
core->alock.lock();
int64_t off = core->lsiz;
int64_t end = off + size;
if (end <= core->msiz) {
if (end > core->psiz) {
int64_t psiz = end + core->psiz / 2;
int64_t diff = psiz % PAGESIZ;
if (diff > 0) psiz += PAGESIZ - diff;
if (psiz > core->msiz) psiz = core->msiz;
if (win_ftruncate(core->fh, psiz) != 0) {
seterrmsg(core, "win_ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = psiz;
}
core->lsiz = end;
core->alock.unlock();
std::memcpy(core->map + off, buf, size);
return true;
}
if (off < core->msiz) {
if (end > core->psiz) {
if (win_ftruncate(core->fh, end) != 0) {
seterrmsg(core, "win_ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = end;
}
size_t hsiz = core->msiz - off;
std::memcpy(core->map + off, buf, hsiz);
off += hsiz;
buf = (char*)buf + hsiz;
size -= hsiz;
}
core->lsiz = end;
core->psiz = end;
core->alock.unlock();
while (true) {
int64_t wb = win_pwrite(core->fh, buf, size, off);
if (wb >= (int64_t)size) {
return true;
} else if (wb > 0) {
buf = (char*)buf + wb;
size -= wb;
off += wb;
} else if (wb == -1) {
seterrmsg(core, "win_pwrite failed");
return false;
} else if (size > 0) {
seterrmsg(core, "win_pwrite failed");
return false;
}
}
return true;
#else
_assert_(buf && size <= MEMMAXSIZ);
if (size < 1) return true;
FileCore* core = (FileCore*)opq_;
core->alock.lock();
int64_t off = core->lsiz;
int64_t end = off + size;
if (end <= core->msiz) {
if (end > core->psiz) {
int64_t psiz = end + core->psiz / 2;
int64_t diff = psiz % PAGESIZ;
if (diff > 0) psiz += PAGESIZ - diff;
if (psiz > core->msiz) psiz = core->msiz;
if (::ftruncate(core->fd, psiz) != 0) {
seterrmsg(core, "ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = psiz;
}
core->lsiz = end;
core->alock.unlock();
std::memcpy(core->map + off, buf, size);
return true;
}
if (off < core->msiz) {
if (end > core->psiz) {
if (::ftruncate(core->fd, end) != 0) {
seterrmsg(core, "ftruncate failed");
core->alock.unlock();
return false;
}
core->psiz = end;
}
size_t hsiz = core->msiz - off;
std::memcpy(core->map + off, buf, hsiz);
off += hsiz;
buf = (char*)buf + hsiz;
size -= hsiz;
}
core->lsiz = end;
core->psiz = end;
core->alock.unlock();
while (true) {
ssize_t wb = ::pwrite(core->fd, buf, size, off);
if (wb >= (ssize_t)size) {
return true;
} else if (wb > 0) {
buf = (char*)buf + wb;
size -= wb;
off += wb;
} else if (wb == -1) {
if (errno != EINTR) {
seterrmsg(core, "pwrite failed");
return false;
}
} else if (size > 0) {
seterrmsg(core, "pwrite failed");
return false;
}
}
return true;
#endif
}
/**
* Read data.
*/
bool File::read(int64_t off, void* buf, size_t size) {
#if defined(_SYS_MSVC_) || defined(_SYS_MINGW_)
_assert_(off >= 0 && off <= FILEMAXSIZ && buf && size <= MEMMAXSIZ);
if (size < 1) return true;
FileCore* core = (FileCore*)opq_;
int64_t end = off + size;
core->alock.lock();
if (end > core->lsiz) {
seterrmsg(core, "out of bounds");
core->alock.unlock();
return false;
}
core->alock.unlock();
if (end <= core->msiz) {
std::memcpy(buf, core->map + off, size);
return true;
}
if (off < core->msiz) {
int64_t hsiz = core->msiz - off;
std::memcpy(buf, core->map + off, hsiz);
off += hsiz;
buf = (char*)buf + hsiz;
size -= hsiz;
}
while (true) {
int64_t rb = win_pread(core->fh, buf, size, off);
if (rb >= (int64_t)size) {
break;
} else if (rb > 0) {
buf = (char*)buf + rb;
size -= rb;
off += rb;
} else if (rb == -1) {
seterrmsg(core, "win_pread failed");
return false;
} else if (size > 0) {