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use crate::error::Error; use libyal_rs_common::ffi::AsTypeRef; use libfsntfs_sys::FILE; use log::trace; use std::convert::TryFrom; use std::ffi::{c_void, CStr}; use std::fmt::{self, Display, Formatter}; use std::mem; #[repr(C)] pub struct __LibfsntfsError(isize); pub type LibfsntfsErrorRefMut = *mut __LibfsntfsError; pub type LibfsntfsErrorRef = *const __LibfsntfsError; #[repr(C)] pub struct LibfsntfsError(LibfsntfsErrorRefMut); impl AsTypeRef for LibfsntfsError { type Ref = LibfsntfsErrorRef; type RefMut = LibfsntfsErrorRefMut; #[inline] fn as_type_ref(&self) -> Self::Ref { self.0 as *const _ } #[inline] fn as_type_ref_mut(&mut self) -> Self::RefMut { self.0 } #[inline] fn as_raw(&mut self) -> *mut Self::RefMut { &mut self.0 as *mut _ } } extern "C" { pub fn libfsntfs_error_free(error: *mut LibfsntfsErrorRefMut); pub fn libfsntfs_error_fprint( error: LibfsntfsErrorRef, stream: *mut FILE, ) -> ::std::os::raw::c_int; pub fn libfsntfs_error_sprint( error: LibfsntfsErrorRef, string: *mut ::std::os::raw::c_char, size: usize, ) -> ::std::os::raw::c_int; pub fn libfsntfs_error_backtrace_fprint( error: LibfsntfsErrorRef, stream: *mut FILE, ) -> ::std::os::raw::c_int; pub fn libfsntfs_error_backtrace_sprint( error: LibfsntfsErrorRef, string: *mut ::std::os::raw::c_char, size: usize, ) -> ::std::os::raw::c_int; } impl Drop for LibfsntfsError { fn drop(&mut self) { trace!("Calling `libfsntfs_error_free`"); unsafe { libfsntfs_error_free(self.as_raw()) }; } } impl TryFrom<*mut __LibfsntfsError> for Error { type Error = Error; fn try_from(err: *mut __LibfsntfsError) -> Result<Self, Self::Error> { if err.is_null() { return Err(Error::Other("Error pointer cannot be NULL".to_owned())); } let mut buffer = vec![0; 1024]; let retcode = unsafe { libfsntfs_error_backtrace_sprint(err as *const _, buffer.as_mut_ptr(), buffer.len()) }; if retcode == -1 { Err(Error::FFI("Failed to print error".to_owned())) } else { let repr = unsafe { CStr::from_ptr(buffer.as_ptr()) }; Ok(Error::FFI(repr.to_string_lossy().to_string())) } } } #[cfg(test)] mod tests { use crate::error::Error; use crate::fixtures::*; use crate::volume::{AccessMode, Volume}; #[test] fn test_error() { let result = Volume::open("non-existent", AccessMode::Read); assert!(result.is_err()); if let Err(e) = result { if let Error::FFI(s) = e { dbg!(&s); assert!( s.find("libfsntfs_volume_open").is_some(), "should contain FFI function name" ); assert!( s.find("unable to open volume").is_some(), "should contain message string" ); return; } } panic!("Test should not reach here!"); } }