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use std::ops::{Deref, DerefMut};
use std::ptr;
use std::slice;
use std::str;
use crate::raw;
use crate::util::Binding;
/// A structure to wrap an intermediate buffer used by libgit2.
///
/// A buffer can be thought of a `Vec<u8>`, but the `Vec` type is not used to
/// avoid copying data back and forth.
pub struct Buf {
raw: raw::git_buf,
}
impl Default for Buf {
fn default() -> Self {
Self::new()
}
}
impl Buf {
/// Creates a new empty buffer.
pub fn new() -> Buf {
crate::init();
unsafe {
Binding::from_raw(&mut raw::git_buf {
ptr: ptr::null_mut(),
size: 0,
reserved: 0,
} as *mut _)
}
}
/// Attempt to view this buffer as a string slice.
///
/// Returns `None` if the buffer is not valid utf-8.
pub fn as_str(&self) -> Option<&str> {
str::from_utf8(&**self).ok()
}
}
impl Deref for Buf {
type Target = [u8];
fn deref(&self) -> &[u8] {
unsafe { slice::from_raw_parts(self.raw.ptr as *const u8, self.raw.size as usize) }
}
}
impl DerefMut for Buf {
fn deref_mut(&mut self) -> &mut [u8] {
unsafe { slice::from_raw_parts_mut(self.raw.ptr as *mut u8, self.raw.size as usize) }
}
}
impl Binding for Buf {
type Raw = *mut raw::git_buf;
unsafe fn from_raw(raw: *mut raw::git_buf) -> Buf {
Buf { raw: *raw }
}
fn raw(&self) -> *mut raw::git_buf {
&self.raw as *const _ as *mut _
}
}
impl Drop for Buf {
fn drop(&mut self) {
unsafe { raw::git_buf_dispose(&mut self.raw) }
}
}
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