SgRaw: add do_in_command()

src/tools/sgutils2.rs

@@ -506,7 +506,7 @@ impl <'a, F: AsRawFd> SgRaw<'a, F> {
         }
 
         if self.buffer.len() < 16 {
-            return Err(format_err!("output buffer too small").into());
+            return Err(format_err!("input buffer too small").into());
         }
 
         let mut ptvp = self.create_scsi_pt_obj()?;
@@ -530,6 +530,45 @@ impl <'a, F: AsRawFd> SgRaw<'a, F> {
         Ok(&self.buffer[..data_len])
     }
 
+    /// Run the specified RAW SCSI command, use data as input buffer
+    pub fn do_in_command<'b>(&mut self, cmd: &[u8], data: &'b mut [u8]) -> Result<&'b [u8], ScsiError> {
+
+        if !unsafe { sg_is_scsi_cdb(cmd.as_ptr(), cmd.len() as c_int) } {
+            return Err(format_err!("no valid SCSI command").into());
+        }
+
+        if data.len() == 0 {
+            return Err(format_err!("got zero-sized input buffer").into());
+        }
+
+        let mut ptvp = self.create_scsi_pt_obj()?;
+
+        unsafe {
+            set_scsi_pt_data_in(
+                ptvp.as_mut_ptr(),
+                data.as_mut_ptr(),
+                data.len() as c_int,
+            );
+
+            set_scsi_pt_cdb(
+                ptvp.as_mut_ptr(),
+                cmd.as_ptr(),
+                cmd.len() as c_int,
+            );
+        };
+
+        self.do_scsi_pt_checked(&mut ptvp)?;
+
+        let resid = unsafe { get_scsi_pt_resid(ptvp.as_ptr()) } as usize;
+
+        if resid > data.len() {
+            return Err(format_err!("do_scsi_pt failed - got strange resid (value too big)").into());
+        }
+        let data_len = data.len() - resid;
+
+        Ok(&data[..data_len])
+    }
+
     /// Run dataout command
     ///
     /// Note: use alloc_page_aligned_buffer to alloc data transfer buffer