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#![allow(clippy::question_mark)]
use std::cell::Cell;
use std::ffi::{c_void, CStr, CString};
use std::io::{ErrorKind, Read, Seek, SeekFrom, Write};
use std::mem::{size_of, ManuallyDrop};
use std::os::raw::{c_char, c_int};
use std::path::Path;
use std::ptr::null;
use std::ptr::null_mut;
use std::rc::Rc;
use std::slice;
use std::thread;
use std::time::Duration;
use std::time::Instant;
use libsqlite3_sys as ffi;
pub trait File: Read + Seek + Write {
fn file_size(&self) -> Result<u64, std::io::Error>;
fn truncate(&mut self, size: u64) -> Result<(), std::io::Error>;
}
pub trait Vfs {
type File: File;
fn open(&self, path: &Path, opts: OpenOptions) -> Result<Self::File, std::io::Error>;
fn delete(&self, path: &Path) -> Result<(), std::io::Error>;
fn exists(&self, path: &Path) -> Result<bool, std::io::Error>;
fn access(&self, _path: &Path, _write: bool) -> Result<bool, std::io::Error> {
Ok(true)
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct OpenOptions {
pub kind: OpenKind,
pub access: OpenAccess,
pub delete_on_close: bool,
}
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum OpenKind {
MainDb,
MainJournal,
TempDb,
TempJournal,
TransientDb,
SubJournal,
SuperJournal,
Wal,
}
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum OpenAccess {
Read,
Write,
Create,
CreateNew,
}
struct State<V> {
vfs: V,
io_methods: ffi::sqlite3_io_methods,
last_error: Rc<Cell<Option<std::io::Error>>>,
}
pub fn register<F: File, V: Vfs<File = F>>(name: &str, vfs: V) -> Result<(), RegisterError> {
let name = ManuallyDrop::new(CString::new(name)?);
let io_methods = ffi::sqlite3_io_methods {
iVersion: 3,
xClose: Some(io::close::<F>),
xRead: Some(io::read::<F>),
xWrite: Some(io::write::<F>),
xTruncate: Some(io::truncate::<F>),
xSync: Some(io::sync::<F>),
xFileSize: Some(io::file_size::<F>),
xLock: Some(io::lock),
xUnlock: Some(io::unlock),
xCheckReservedLock: Some(io::check_reserved_lock),
xFileControl: Some(io::file_control),
xSectorSize: Some(io::sector_size),
xDeviceCharacteristics: Some(io::device_characteristics),
xShmMap: Some(io::shm_map),
xShmLock: Some(io::shm_lock),
xShmBarrier: Some(io::shm_barrier),
xShmUnmap: Some(io::shm_unmap),
xFetch: Some(io::mem_fetch::<F>),
xUnfetch: Some(io::mem_unfetch),
};
let ptr = Box::into_raw(Box::new(State {
vfs,
io_methods,
last_error: Default::default(),
}));
let vfs = Box::into_raw(Box::new(ffi::sqlite3_vfs {
iVersion: 3,
szOsFile: size_of::<FileState<F>>() as i32,
mxPathname: MAX_PATH_LENGTH as i32,
pNext: null_mut(),
zName: name.as_ptr(),
pAppData: ptr as _,
xOpen: Some(vfs::open::<F, V>),
xDelete: Some(vfs::delete::<V>),
xAccess: Some(vfs::access::<V>),
xFullPathname: Some(vfs::full_pathname),
xDlOpen: Some(vfs::dlopen),
xDlError: Some(vfs::dlerror),
xDlSym: Some(vfs::dlsym),
xDlClose: Some(vfs::dlclose),
xRandomness: Some(vfs::randomness),
xSleep: Some(vfs::sleep),
xCurrentTime: Some(vfs::current_time),
xGetLastError: Some(vfs::get_last_error),
xCurrentTimeInt64: Some(vfs::current_time_int64),
xSetSystemCall: None,
xGetSystemCall: None,
xNextSystemCall: None,
}));
let result = unsafe { ffi::sqlite3_vfs_register(vfs, false as i32) };
if result != ffi::SQLITE_OK {
return Err(RegisterError::Register(result));
}
Ok(())
}
const MAX_PATH_LENGTH: usize = 512;
#[repr(C)]
struct FileState<F> {
base: ffi::sqlite3_file,
name: *mut i8,
file: *mut F,
last_error: *const Cell<Option<std::io::Error>>,
}
mod vfs {
use super::*;
pub unsafe extern "C" fn open<F: File, V: Vfs<File = F>>(
p_vfs: *mut ffi::sqlite3_vfs,
z_name: *const c_char,
p_file: *mut ffi::sqlite3_file,
flags: c_int,
_p_out_flags: *mut c_int,
) -> c_int {
let name = if z_name.is_null() {
None
} else {
CStr::from_ptr(z_name).to_str().ok()
};
log::trace!("open z_name={:?} flags={}", name, flags);
let state = match vfs_state::<V>(p_vfs) {
Ok(state) => state,
Err(_) => return ffi::SQLITE_ERROR,
};
state.last_error.take();
let path = CStr::from_ptr(z_name);
let path = path.to_string_lossy().to_string();
let opts = match OpenOptions::from_flags(flags) {
Some(opts) => opts,
None => {
state.last_error.set(Some(std::io::Error::new(
std::io::ErrorKind::Other,
"invalid open flags",
)));
return ffi::SQLITE_CANTOPEN;
}
};
if let Err(err) = state.vfs.open(path.as_ref(), opts).and_then(|f| {
let out_file = (p_file as *mut FileState<F>)
.as_mut()
.ok_or_else(null_ptr_error)?;
out_file.base.pMethods = &state.io_methods;
out_file.name = CString::new(name.unwrap().to_string()).unwrap().into_raw();
out_file.file = Box::into_raw(Box::new(f));
out_file.last_error = Rc::into_raw(Rc::clone(&state.last_error));
Ok(())
}) {
state.last_error.set(Some(err));
return ffi::SQLITE_CANTOPEN;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn delete<V: Vfs>(
p_vfs: *mut ffi::sqlite3_vfs,
z_path: *const c_char,
_sync_dir: c_int,
) -> c_int {
let name = if z_path.is_null() {
None
} else {
CStr::from_ptr(z_path).to_str().ok()
};
log::trace!("delete z_name={:?}", name);
let state = match vfs_state::<V>(p_vfs) {
Ok(state) => state,
Err(_) => return ffi::SQLITE_DELETE,
};
state.last_error.take();
let path = CStr::from_ptr(z_path);
let path = path.to_string_lossy().to_string();
match state.vfs.delete(path.as_ref()) {
Ok(_) => ffi::SQLITE_OK,
Err(err) => {
if err.kind() == ErrorKind::NotFound {
ffi::SQLITE_OK
} else {
state.last_error.set(Some(err));
ffi::SQLITE_DELETE
}
}
}
}
pub unsafe extern "C" fn access<V: Vfs>(
p_vfs: *mut ffi::sqlite3_vfs,
z_path: *const c_char,
flags: c_int,
p_res_out: *mut c_int,
) -> c_int {
let name = if z_path.is_null() {
None
} else {
CStr::from_ptr(z_path).to_str().ok()
};
log::trace!("access z_name={:?} flags={}", name, flags);
let state = match vfs_state::<V>(p_vfs) {
Ok(state) => state,
Err(_) => return ffi::SQLITE_ERROR,
};
state.last_error.take();
let path = CStr::from_ptr(z_path);
let path = path.to_string_lossy().to_string();
let result = match flags {
ffi::SQLITE_ACCESS_EXISTS => state.vfs.exists(path.as_ref()),
ffi::SQLITE_ACCESS_READ => state.vfs.access(path.as_ref(), false),
ffi::SQLITE_ACCESS_READWRITE => state.vfs.access(path.as_ref(), true),
_ => return ffi::SQLITE_IOERR_ACCESS,
};
if let Err(err) = result.and_then(|ok| {
let p_res_out: &mut c_int = p_res_out.as_mut().ok_or_else(null_ptr_error)?;
*p_res_out = ok as i32;
Ok(())
}) {
state.last_error.set(Some(err));
return ffi::SQLITE_IOERR_ACCESS;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn full_pathname(
p_vfs: *mut ffi::sqlite3_vfs,
z_path: *const c_char,
n_out: c_int,
z_out: *mut c_char,
) -> c_int {
let name = CStr::from_ptr(z_path);
log::trace!("full_pathname name={}", name.to_string_lossy());
let state = match vfs_state::<()>(p_vfs) {
Ok(state) => state,
Err(_) => return ffi::SQLITE_ERROR,
};
state.last_error.take();
let name = name.to_bytes_with_nul();
if name.len() > n_out as usize || name.len() > MAX_PATH_LENGTH {
return ffi::SQLITE_ERROR;
}
let out = slice::from_raw_parts_mut(z_out as *mut u8, name.len());
out.copy_from_slice(name);
ffi::SQLITE_OK
}
pub unsafe extern "C" fn dlopen(
_p_vfs: *mut ffi::sqlite3_vfs,
_z_path: *const c_char,
) -> *mut c_void {
log::trace!("dlopen");
null_mut()
}
pub unsafe extern "C" fn dlerror(
_p_vfs: *mut ffi::sqlite3_vfs,
n_byte: c_int,
z_err_msg: *mut c_char,
) {
log::trace!("dlerror");
let msg = concat!("Loadable extensions are not supported", "\0");
ffi::sqlite3_snprintf(n_byte, z_err_msg, msg.as_ptr() as _);
}
pub unsafe extern "C" fn dlsym(
_p_vfs: *mut ffi::sqlite3_vfs,
_p: *mut c_void,
_z_sym: *const c_char,
) -> Option<unsafe extern "C" fn(*mut ffi::sqlite3_vfs, *mut c_void, *const i8)> {
log::trace!("dlsym");
None
}
pub unsafe extern "C" fn dlclose(_p_vfs: *mut ffi::sqlite3_vfs, _p_handle: *mut c_void) {
log::trace!("dlclose");
}
pub unsafe extern "C" fn randomness(
_p_vfs: *mut ffi::sqlite3_vfs,
n_byte: c_int,
z_buf_out: *mut c_char,
) -> c_int {
log::trace!("randomness");
use rand::Rng;
let bytes = slice::from_raw_parts_mut(z_buf_out, n_byte as usize);
rand::thread_rng().fill(bytes);
bytes.len() as c_int
}
pub unsafe extern "C" fn sleep(_p_vfs: *mut ffi::sqlite3_vfs, n_micro: c_int) -> c_int {
log::trace!("sleep");
let instant = Instant::now();
thread::sleep(Duration::from_micros(n_micro as u64));
instant.elapsed().as_micros() as c_int
}
pub unsafe extern "C" fn current_time(
p_vfs: *mut ffi::sqlite3_vfs,
p_time_out: *mut f64,
) -> c_int {
log::trace!("current_time");
let state = match vfs_state::<()>(p_vfs) {
Ok(state) => state,
Err(_) => return ffi::SQLITE_ERROR,
};
state.last_error.take();
let now = time::OffsetDateTime::now_utc().unix_timestamp() as f64;
*p_time_out = 2440587.5 + now / 864.0e5;
ffi::SQLITE_OK
}
pub unsafe extern "C" fn get_last_error(
p_vfs: *mut ffi::sqlite3_vfs,
n_byte: c_int,
z_err_msg: *mut c_char,
) -> c_int {
let state = match vfs_state::<()>(p_vfs) {
Ok(state) => state,
Err(_) => return ffi::SQLITE_ERROR,
};
if let Some(err) = state.last_error.take() {
let msg = match CString::new(err.to_string()) {
Ok(msg) => msg,
Err(_) => return ffi::SQLITE_ERROR,
};
let msg = msg.to_bytes_with_nul();
if msg.len() > n_byte as usize {
return ffi::SQLITE_ERROR;
}
let out = slice::from_raw_parts_mut(z_err_msg as *mut u8, msg.len());
out.copy_from_slice(msg);
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn current_time_int64(p_vfs: *mut ffi::sqlite3_vfs, p: *mut i64) -> i32 {
log::trace!("current_time_int64");
let state = match vfs_state::<()>(p_vfs) {
Ok(state) => state,
Err(_) => return ffi::SQLITE_ERROR,
};
state.last_error.take();
let now = time::OffsetDateTime::now_utc().unix_timestamp() as f64;
*p = ((2440587.5 + now / 864.0e5) * 864.0e5) as i64;
ffi::SQLITE_OK
}
}
mod io {
use super::*;
pub unsafe extern "C" fn close<F>(p_file: *mut ffi::sqlite3_file) -> c_int {
log::trace!("close");
let state = match file_state::<F>(p_file, true) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_CLOSE,
};
log::trace!("close ({})", CStr::from_ptr(state.name).to_string_lossy());
drop(CString::from_raw(state.name));
state.name = null_mut();
Box::from_raw(state.file);
state.file = null_mut();
Rc::from_raw(state.last_error);
state.last_error = null();
ffi::SQLITE_OK
}
pub unsafe extern "C" fn read<F: File>(
p_file: *mut ffi::sqlite3_file,
z_buf: *mut c_void,
i_amt: c_int,
i_ofst: ffi::sqlite3_int64,
) -> c_int {
log::trace!("read offset={} len={}", i_ofst, i_amt);
let state = match file_state::<F>(p_file, true) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_CLOSE,
};
log::trace!("read ({})", CStr::from_ptr(state.name).to_string_lossy());
let file = match file::<F>(state.file) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_CLOSE,
};
match file.seek(SeekFrom::Start(i_ofst as u64)) {
Ok(o) => {
if o != i_ofst as u64 {
return ffi::SQLITE_IOERR_READ;
}
}
Err(err) => {
state.set_last_error(err);
return ffi::SQLITE_IOERR_READ;
}
}
let out = slice::from_raw_parts_mut(z_buf as *mut u8, i_amt as usize);
if let Err(err) = file.read_exact(out) {
let kind = err.kind();
if kind == ErrorKind::UnexpectedEof {
return ffi::SQLITE_IOERR_SHORT_READ;
} else {
state.set_last_error(err);
return ffi::SQLITE_IOERR_READ;
}
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn write<F: File>(
p_file: *mut ffi::sqlite3_file,
z: *const c_void,
i_amt: c_int,
i_ofst: ffi::sqlite3_int64,
) -> c_int {
log::trace!("write offset={} len={}", i_ofst, i_amt);
let state = match file_state::<F>(p_file, true) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_WRITE,
};
log::trace!("write ({})", CStr::from_ptr(state.name).to_string_lossy());
let file = match file::<F>(state.file) {
Ok(f) => f,
Err(err) => {
state.set_last_error(err);
return ffi::SQLITE_IOERR_WRITE;
}
};
match file.seek(SeekFrom::Start(i_ofst as u64)) {
Ok(o) => {
if o != i_ofst as u64 {
return ffi::SQLITE_IOERR_WRITE;
}
}
Err(err) => {
state.set_last_error(err);
return ffi::SQLITE_IOERR_WRITE;
}
}
let data = slice::from_raw_parts(z as *mut u8, i_amt as usize);
if let Err(err) = file.write_all(data) {
state.set_last_error(err);
return ffi::SQLITE_IOERR_WRITE;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn truncate<F: File>(
p_file: *mut ffi::sqlite3_file,
size: ffi::sqlite3_int64,
) -> c_int {
log::trace!("truncate");
let state = match file_state::<F>(p_file, true) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_FSYNC,
};
log::trace!(
"truncate ({})",
CStr::from_ptr(state.name).to_string_lossy()
);
let file = match file::<F>(state.file) {
Ok(f) => f,
Err(err) => {
state.set_last_error(err);
return ffi::SQLITE_IOERR_FSYNC;
}
};
if let Err(err) = file.truncate(size as u64) {
state.set_last_error(err);
return ffi::SQLITE_IOERR_TRUNCATE;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn sync<F: File>(p_file: *mut ffi::sqlite3_file, _flags: c_int) -> c_int {
log::trace!("sync");
let state = match file_state::<F>(p_file, true) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_FSYNC,
};
log::trace!("sync ({})", CStr::from_ptr(state.name).to_string_lossy());
let file = match file::<F>(state.file) {
Ok(f) => f,
Err(err) => {
state.set_last_error(err);
return ffi::SQLITE_IOERR_FSYNC;
}
};
if let Err(err) = file.flush() {
state.set_last_error(err);
return ffi::SQLITE_IOERR_FSYNC;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn file_size<F: File>(
p_file: *mut ffi::sqlite3_file,
p_size: *mut ffi::sqlite3_int64,
) -> c_int {
log::trace!("file_size");
let state = match file_state::<F>(p_file, true) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_FSTAT,
};
log::trace!(
"file_size ({})",
CStr::from_ptr(state.name).to_string_lossy()
);
let file = match file::<F>(state.file) {
Ok(f) => f,
Err(err) => {
state.set_last_error(err);
return ffi::SQLITE_IOERR_FSTAT;
}
};
if let Err(err) = file.file_size().and_then(|n| {
let p_size: &mut ffi::sqlite3_int64 = p_size.as_mut().ok_or_else(null_ptr_error)?;
*p_size = n as ffi::sqlite3_int64;
Ok(())
}) {
state.set_last_error(err);
return ffi::SQLITE_IOERR_FSTAT;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn lock(p_file: *mut ffi::sqlite3_file, _e_lock: c_int) -> c_int {
log::trace!("lock");
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_IOERR_LOCK;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn unlock(p_file: *mut ffi::sqlite3_file, _e_lock: c_int) -> c_int {
log::trace!("unlock");
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_IOERR_UNLOCK;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn check_reserved_lock(
p_file: *mut ffi::sqlite3_file,
p_res_out: *mut c_int,
) -> c_int {
log::trace!("check_reserved_lock");
let state = match file_state::<()>(p_file, true) {
Ok(f) => f,
Err(_) => return ffi::SQLITE_IOERR_CHECKRESERVEDLOCK,
};
match p_res_out.as_mut() {
Some(p_res_out) => {
*p_res_out = false as i32;
}
None => {
state.set_last_error(null_ptr_error());
return ffi::SQLITE_IOERR_CHECKRESERVEDLOCK;
}
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn file_control(
p_file: *mut ffi::sqlite3_file,
op: c_int,
_p_arg: *mut c_void,
) -> c_int {
log::trace!("file_control op={}", op);
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_ERROR;
}
ffi::SQLITE_NOTFOUND
}
pub unsafe extern "C" fn sector_size(p_file: *mut ffi::sqlite3_file) -> c_int {
log::trace!("sector_size");
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_ERROR;
}
1024
}
pub unsafe extern "C" fn device_characteristics(p_file: *mut ffi::sqlite3_file) -> c_int {
log::trace!("device_characteristics");
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_ERROR;
}
ffi::SQLITE_IOCAP_ATOMIC |
ffi::SQLITE_IOCAP_POWERSAFE_OVERWRITE |
ffi::SQLITE_IOCAP_SAFE_APPEND |
ffi::SQLITE_IOCAP_SEQUENTIAL
}
pub unsafe extern "C" fn shm_map(
p_file: *mut ffi::sqlite3_file,
i_pg: i32,
pgsz: i32,
b_extend: i32,
_pp: *mut *mut c_void,
) -> i32 {
log::trace!("shm_map pg={} sz={} extend={}", i_pg, pgsz, b_extend);
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_IOERR_SHMMAP;
}
ffi::SQLITE_IOERR_SHMMAP
}
pub unsafe extern "C" fn shm_lock(
p_file: *mut ffi::sqlite3_file,
_offset: i32,
_n: i32,
_flags: i32,
) -> i32 {
log::trace!("shm_lock");
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_IOERR_SHMMAP;
}
ffi::SQLITE_IOERR_SHMLOCK
}
pub unsafe extern "C" fn shm_barrier(_p_file: *mut ffi::sqlite3_file) {
log::trace!("shm_barrier");
}
pub unsafe extern "C" fn shm_unmap(p_file: *mut ffi::sqlite3_file, _delete_flags: i32) -> i32 {
log::trace!("shm_unmap");
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_IOERR_SHMMAP;
}
ffi::SQLITE_OK
}
pub unsafe extern "C" fn mem_fetch<F: File>(
p_file: *mut ffi::sqlite3_file,
i_ofst: i64,
i_amt: i32,
_pp: *mut *mut c_void,
) -> i32 {
log::trace!("mem_fetch offset={} len={}", i_ofst, i_amt);
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_ERROR;
}
ffi::SQLITE_ERROR
}
pub unsafe extern "C" fn mem_unfetch(
p_file: *mut ffi::sqlite3_file,
i_ofst: i64,
_p_page: *mut c_void,
) -> i32 {
log::trace!("mem_unfetch offset={}", i_ofst);
if file_state::<()>(p_file, true).is_err() {
return ffi::SQLITE_ERROR;
}
ffi::SQLITE_OK
}
}
impl<F> FileState<F> {
unsafe fn unset_last_error(&mut self) {
let last_error = Rc::from_raw(self.last_error);
last_error.take();
self.last_error = Rc::into_raw(last_error);
}
unsafe fn set_last_error(&mut self, err: std::io::Error) {
let last_error = Rc::from_raw(self.last_error);
last_error.set(Some(err));
self.last_error = Rc::into_raw(last_error);
}
}
fn null_ptr_error() -> std::io::Error {
std::io::Error::new(ErrorKind::Other, "received null pointer")
}
unsafe fn vfs_state<'a, V>(ptr: *mut ffi::sqlite3_vfs) -> Result<&'a mut State<V>, std::io::Error> {
let vfs: &mut ffi::sqlite3_vfs = ptr.as_mut().ok_or_else(null_ptr_error)?;
let state = (vfs.pAppData as *mut State<V>)
.as_mut()
.ok_or_else(null_ptr_error)?;
Ok(state)
}
unsafe fn file_state<'a, F>(
ptr: *mut ffi::sqlite3_file,
reset_last_error: bool,
) -> Result<&'a mut FileState<F>, std::io::Error> {
let f = (ptr as *mut FileState<F>)
.as_mut()
.ok_or_else(null_ptr_error)?;
if reset_last_error {
f.unset_last_error();
}
Ok(f)
}
unsafe fn file<'a, F>(ptr: *mut F) -> Result<&'a mut F, std::io::Error> {
let f: &mut F = ptr.as_mut().ok_or_else(null_ptr_error)?;
Ok(f)
}
impl<F> Drop for FileState<F> {
fn drop(&mut self) {
unsafe {
drop(CString::from_raw(self.name));
Box::from_raw(self.file);
Rc::from_raw(self.last_error);
};
}
}
impl File for std::fs::File {
fn file_size(&self) -> Result<u64, std::io::Error> {
Ok(self.metadata()?.len())
}
fn truncate(&mut self, size: u64) -> Result<(), std::io::Error> {
self.set_len(size)
}
}
impl OpenOptions {
fn from_flags(flags: i32) -> Option<Self> {
Some(OpenOptions {
kind: OpenKind::from_flags(flags)?,
access: OpenAccess::from_flags(flags)?,
delete_on_close: flags & ffi::SQLITE_OPEN_DELETEONCLOSE > 0,
})
}
}
impl OpenKind {
fn from_flags(flags: i32) -> Option<Self> {
match flags {
flags if flags & ffi::SQLITE_OPEN_MAIN_DB > 0 => Some(Self::MainDb),
flags if flags & ffi::SQLITE_OPEN_MAIN_JOURNAL > 0 => Some(Self::MainJournal),
flags if flags & ffi::SQLITE_OPEN_TEMP_DB > 0 => Some(Self::TempDb),
flags if flags & ffi::SQLITE_OPEN_TEMP_JOURNAL > 0 => Some(Self::TempJournal),
flags if flags & ffi::SQLITE_OPEN_TRANSIENT_DB > 0 => Some(Self::TransientDb),
flags if flags & ffi::SQLITE_OPEN_SUBJOURNAL > 0 => Some(Self::SubJournal),
flags if flags & ffi::SQLITE_OPEN_SUPER_JOURNAL > 0 => Some(Self::SuperJournal),
flags if flags & ffi::SQLITE_OPEN_WAL > 0 => Some(Self::Wal),
_ => None,
}
}
}
impl OpenAccess {
fn from_flags(flags: i32) -> Option<Self> {
match flags {
flags
if (flags & ffi::SQLITE_OPEN_CREATE > 0)
&& (flags & ffi::SQLITE_OPEN_EXCLUSIVE > 0) =>
{
Some(Self::CreateNew)
}
flags if flags & ffi::SQLITE_OPEN_CREATE > 0 => Some(Self::Create),
flags if flags & ffi::SQLITE_OPEN_READWRITE > 0 => Some(Self::Write),
flags if flags & ffi::SQLITE_OPEN_READONLY > 0 => Some(Self::Read),
_ => None,
}
}
}
#[derive(Debug)]
pub enum RegisterError {
Nul(std::ffi::NulError),
Register(i32),
}
impl std::error::Error for RegisterError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Self::Nul(err) => Some(err),
Self::Register(_) => None,
}
}
}
impl std::fmt::Display for RegisterError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Nul(_) => f.write_str("interior nul byte in name found"),
Self::Register(code) => {
write!(f, "registering sqlite vfs failed with error code: {}", code)
}
}
}
}
impl From<std::ffi::NulError> for RegisterError {
fn from(err: std::ffi::NulError) -> Self {
Self::Nul(err)
}
}