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use std::{ops, result, slice, str}; use ffi; use crate::{rand::Level, Error, NonNull, Result}; #[derive(Debug)] pub struct Buffer { buf: NonNull<*mut u8>, len: usize, } impl Drop for Buffer { #[inline] fn drop(&mut self) { unsafe { ffi::gcry_free(self.buf.as_ptr().cast()); } } } impl Buffer { #[inline] pub unsafe fn from_raw(buf: *mut u8, len: usize) -> Buffer { Buffer { buf: NonNull::<*mut u8>::new(buf).unwrap(), len, } } #[inline] pub fn new(len: usize) -> Result<Buffer> { let _ = crate::init_default(); unsafe { ffi::gcry_malloc(len) .as_mut() .map(|x| Buffer::from_raw(x as *mut _ as *mut _, len)) .ok_or_else(Error::last_os_error) } } #[inline] pub fn new_secure(len: usize) -> Result<Buffer> { let _ = crate::init_default(); unsafe { ffi::gcry_malloc_secure(len) .as_mut() .map(|x| Buffer::from_raw(x as *mut _ as *mut _, len)) .ok_or_else(Error::last_os_error) } } #[inline] pub fn try_clone(&self) -> Result<Buffer> { let mut result = if self.is_secure() { Buffer::new_secure(self.len)? } else { Buffer::new(self.len)? }; result.copy_from_slice(self); Ok(result) } #[inline] pub fn random(len: usize, level: Level) -> Result<Buffer> { let _ = crate::init_default(); unsafe { ffi::gcry_random_bytes(len, level.raw()) .as_mut() .map(|x| Buffer::from_raw(x as *mut _ as *mut _, len)) .ok_or_else(Error::last_os_error) } } #[inline] pub fn random_secure(len: usize, level: Level) -> Result<Buffer> { let _ = crate::init_default(); unsafe { ffi::gcry_random_bytes_secure(len, level.raw()) .as_mut() .map(|x| Buffer::from_raw(x as *mut _ as *mut _, len)) .ok_or_else(Error::last_os_error) } } #[inline] pub fn is_secure(&self) -> bool { unsafe { ffi::gcry_is_secure(self.buf.as_ptr().cast()) != 0 } } #[inline] pub fn as_bytes(&self) -> &[u8] { unsafe { slice::from_raw_parts(self.buf.as_ptr(), self.len) } } #[inline] pub fn as_bytes_mut(&mut self) -> &mut [u8] { unsafe { slice::from_raw_parts_mut(self.buf.as_ptr(), self.len) } } #[inline] pub fn to_str(&self) -> result::Result<&str, str::Utf8Error> { str::from_utf8(self.as_bytes()) } } impl ops::Deref for Buffer { type Target = [u8]; #[inline] fn deref(&self) -> &[u8] { self.as_bytes() } } impl ops::DerefMut for Buffer { #[inline] fn deref_mut(&mut self) -> &mut [u8] { self.as_bytes_mut() } } impl AsRef<[u8]> for Buffer { #[inline] fn as_ref(&self) -> &[u8] { self.as_bytes() } } impl AsMut<[u8]> for Buffer { #[inline] fn as_mut(&mut self) -> &mut [u8] { self.as_bytes_mut() } }