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#![allow(dead_code, non_snake_case)]
use crate::{pg_sys, void_mut_ptr};
use std::io::Error;
pub struct StringInfo {
sid: pg_sys::StringInfo,
needs_pfree: bool,
}
impl Into<pg_sys::StringInfo> for StringInfo {
fn into(self) -> pg_sys::StringInfo {
self.sid
}
}
impl Into<&'static std::ffi::CStr> for StringInfo {
fn into(self) -> &'static std::ffi::CStr {
let len = self.len();
let ptr = self.into_char_ptr();
unsafe {
std::ffi::CStr::from_bytes_with_nul_unchecked(std::slice::from_raw_parts(
ptr as *const u8,
(len + 1) as usize,
))
}
}
}
impl std::io::Write for StringInfo {
fn write(&mut self, buf: &[u8]) -> Result<usize, Error> {
self.push_bytes(buf);
Ok(buf.len())
}
fn flush(&mut self) -> Result<(), Error> {
Ok(())
}
}
impl ToString for StringInfo {
fn to_string(&self) -> String {
unsafe { std::str::from_utf8_unchecked(self.as_bytes()).to_owned() }
}
}
impl StringInfo {
pub fn new() -> Self {
StringInfo {
sid: unsafe { pg_sys::makeStringInfo() },
needs_pfree: true,
}
}
pub fn with_capacity(len: usize) -> Self {
let mut si = StringInfo::default();
si.enlarge(len);
si
}
pub fn from_pg(sid: pg_sys::StringInfo) -> Option<Self> {
if sid.is_null() {
None
} else {
Some(StringInfo {
sid,
needs_pfree: false,
})
}
}
#[inline]
pub fn len(&self) -> usize {
unsafe { &mut *self.sid }.len as usize
}
#[inline]
pub fn is_empty(&self) -> bool {
self.len() == 0
}
#[inline]
pub fn push(&mut self, ch: char) {
self.push_str(&ch.to_string());
}
#[inline]
pub fn push_str(&mut self, s: &str) {
self.push_bytes(s.as_bytes())
}
#[inline]
pub fn push_bytes(&mut self, bytes: &[u8]) {
unsafe {
pg_sys::appendBinaryStringInfo(
self.sid,
bytes.as_ptr() as *const std::os::raw::c_char,
bytes.len() as i32,
)
}
}
#[inline]
pub fn push_raw(&mut self, ptr: void_mut_ptr, len: usize) {
unsafe {
pg_sys::appendBinaryStringInfo(self.sid, ptr as *const std::os::raw::c_char, len as i32)
}
}
#[inline]
pub fn reset(&mut self) {
unsafe { pg_sys::resetStringInfo(self.sid) }
}
#[inline]
pub fn enlarge(&mut self, needed: usize) {
unsafe { pg_sys::enlargeStringInfo(self.sid, needed as i32) }
}
#[inline]
pub fn as_ptr(&self) -> *mut std::os::raw::c_char {
unsafe { (*self.sid).data }
}
#[inline]
pub fn as_bytes(&self) -> &[u8] {
unsafe {
if (*self.sid).data.is_null() {
return &[];
}
std::slice::from_raw_parts((*self.sid).data as *const u8, self.len())
}
}
#[inline]
pub fn as_bytes_mut(&mut self) -> &mut [u8] {
unsafe {
if (*self.sid).data.is_null() {
return &mut [];
}
std::slice::from_raw_parts_mut((*self.sid).data as *mut u8, self.len())
}
}
#[inline]
pub fn into_pg(mut self) -> *mut pg_sys::StringInfoData {
self.needs_pfree = false;
self.sid
}
#[inline]
pub fn into_char_ptr(mut self) -> *const std::os::raw::c_char {
self.needs_pfree = false;
unsafe {
let ptr = (*self.sid).data;
(&mut *self.sid).data = std::ptr::null_mut();
ptr as *const std::os::raw::c_char
}
}
}
impl Default for StringInfo {
fn default() -> Self {
Self::new()
}
}
impl From<String> for StringInfo {
fn from(s: String) -> Self {
StringInfo::from(s.as_str())
}
}
impl From<&str> for StringInfo {
fn from(s: &str) -> Self {
let mut rc = StringInfo::new();
rc.push_str(s);
rc
}
}
impl From<Vec<u8>> for StringInfo {
fn from(v: Vec<u8>) -> Self {
let mut rc = StringInfo::new();
rc.push_bytes(v.as_slice());
rc
}
}
impl From<&[u8]> for StringInfo {
fn from(v: &[u8]) -> Self {
let mut rc = StringInfo::new();
rc.push_bytes(v);
rc
}
}
impl Drop for StringInfo {
fn drop(&mut self) {
if self.needs_pfree {
unsafe {
if !(*self.sid).data.is_null() {
pg_sys::pfree((*self.sid).data as void_mut_ptr);
}
pg_sys::pfree(self.sid as void_mut_ptr);
}
}
}
}