From 99c805f45e471c22cd27746c3c2fb7a836939d8d Mon Sep 17 00:00:00 2001
From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Fri, 10 Jan 2020 23:20:28 +0100
Subject: [PATCH] test: Use a pipe to back the write buffer for the Logger
 test.

---
 test/logger_test.rs | 50 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 43 insertions(+), 7 deletions(-)

diff --git a/test/logger_test.rs b/test/logger_test.rs
index efdfcf2..614108b 100644
--- a/test/logger_test.rs
+++ b/test/logger_test.rs
@@ -68,6 +68,36 @@ impl Storage for FakeStorage {
     }
 }
 
+struct Pipe {
+    pipe_fd: [i32; 2],
+}
+
+impl Pipe {
+    fn new() -> Pipe {
+        let mut pipe_fd = [-1i32; 2];
+
+        unsafe {
+            extern {
+                fn pipe(pipefd: *mut i32) -> i32;
+            }
+
+            pipe(pipe_fd.as_mut_ptr());
+        }
+
+        Pipe {
+            pipe_fd: pipe_fd,
+        }
+    }
+
+    fn read_fd(&self) -> i32 {
+        self.pipe_fd[0]
+    }
+
+    fn write_fd(&self) -> i32 {
+        self.pipe_fd[1]
+    }
+}
+
 // Runs a couple of recordings on fully erased flash memory.
 #[test]
 fn first_recording() {
@@ -219,11 +249,12 @@ extern "C" fn flush_write_buffer(user_data: *mut BufferUserData,
                                  buf: *const u8,
                                  _bufsiz: usize,
                                  count: usize) -> isize {
-    let _final_buffer = user_data as *mut [u8; 8192];
-    let final_buffer = unsafe { &mut * _final_buffer };
+    let _file = user_data as *mut std::fs::File;
 
     unsafe {
-        core::ptr::copy_nonoverlapping(buf, final_buffer.as_mut_ptr(), count);
+        let file = &mut * _file;
+
+        file.write_all(std::slice::from_raw_parts(buf, count)).unwrap();
     }
 
     count as isize
@@ -232,17 +263,20 @@ extern "C" fn flush_write_buffer(user_data: *mut BufferUserData,
 // Verifies that Logger::get_recording() detects unknown recording IDs.
 #[test]
 fn get_recording_invalid() {
-    let mut final_buffer = [0u8; 8192];
+    let pipe = Pipe::new();
+
+    let mut file = unsafe { std::fs::File::from_raw_fd(pipe.write_fd()) };
 
     let mut yenc_buffer_space = [0u8; 8192];
     let mut yenc_buffer = Buffer::alloc();
 
-    let user_data = (&mut final_buffer as *mut [u8; 8192]) as *mut BufferUserData;
+    let user_data = (&mut file as *mut std::fs::File) as *mut BufferUserData;
 
     yenc_buffer.init(yenc_buffer_space.as_mut_ptr(),
                      yenc_buffer_space.len(),
                      flush_write_buffer,
                      user_data);
+
     let mut fake_storage = FakeStorage::new();
 
     let mut logger = Logger::new(&mut fake_storage);
@@ -259,12 +293,14 @@ fn get_recording_invalid() {
 // Verifies that Logger::get_recording() can retrieve finished recordings.
 #[test]
 fn get_recording_valid() {
-    let mut final_buffer = [0u8; 8192];
+    let pipe = Pipe::new();
+
+    let mut file = unsafe { std::fs::File::from_raw_fd(pipe.write_fd()) };
 
     let mut yenc_buffer_space = [0u8; 8192];
     let mut yenc_buffer = Buffer::alloc();
 
-    let user_data = (&mut final_buffer as *mut [u8; 8192]) as *mut BufferUserData;
+    let user_data = (&mut file as *mut std::fs::File) as *mut BufferUserData;
 
     yenc_buffer.init(yenc_buffer_space.as_mut_ptr(),
                      yenc_buffer_space.len(),
-- 
2.30.2