Add (partial) safe protocol implementation for EFI_HII_DATABASE_PROTOCOL

This only grants access to the HII-database's raw buffer for now.

Author: seijikun

uefi/CHANGELOG.md

@@ -7,6 +7,7 @@
 - Added `proto::hii::config::ConfigKeywordHandler`.
 - Added `proto::hii::config::HiiConfigAccess`.
 - Added `proto::hii::config_str::ConfigurationString`.
+- Added `proto::hii::database::HiiDatabase`.
 
 ## Changed
 - **Breaking:** `boot::stall` now take `core::time::Duration` instead of `usize`.

uefi/src/proto/hii/database.rs

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+//! HII Database protocol.
+
+use alloc::boxed::Box;
+use uefi_macros::unsafe_protocol;
+use uefi_raw::protocol::hii::database::HiiDatabaseProtocol;
+
+use crate::mem::make_boxed;
+use crate::{Error, StatusExt};
+
+/// The HII Configuration Access Protocol.
+///
+/// This protocol grants access to the HII database definition available in every UEFI firmware.
+/// This database contains internationalized strings, as well as a description of all
+/// supported BIOS settings, together with their logic (e.g.: option A blocks option B if value is `true`).
+///
+/// # UEFI Spec Description
+///
+/// Database manager for HII-related data structures.
+#[derive(Debug)]
+#[repr(transparent)]
+#[unsafe_protocol(HiiDatabaseProtocol::GUID)]
+pub struct HiiDatabase(HiiDatabaseProtocol);
+
+impl HiiDatabase {
+    /// Export all package lists as raw byte buffer.
+    pub fn export_all_raw(&self) -> crate::Result<Box<[u8]>> {
+        fn fetch_data_fn<'a>(
+            proto: &HiiDatabase,
+            buf: &'a mut [u8],
+        ) -> Result<&'a mut [u8], Error<Option<usize>>> {
+            unsafe {
+                let mut size = buf.len();
+                let status = {
+                    (proto.0.export_package_lists)(
+                        &proto.0,
+                        core::ptr::null_mut(),
+                        &mut size,
+                        buf.as_mut_ptr().cast(),
+                    )
+                };
+                status.to_result_with_err(|_| Some(size)).map(|_| buf)
+            }
+        }
+
+        #[cfg(not(feature = "unstable"))]
+        let buf = make_boxed::<[u8], _>(|buf| fetch_data_fn(self, buf))?;
+
+        #[cfg(feature = "unstable")]
+        let buf = make_boxed::<[u8], _, _>(|buf| fetch_data_fn(self, buf), alloc::alloc::Global)?;
+
+        Ok(buf)
+    }
+}

uefi/src/proto/hii/mod.rs

@@ -5,3 +5,5 @@
 pub mod config;
 #[cfg(feature = "alloc")]
 pub mod config_str;
+#[cfg(feature = "alloc")]
+pub mod database;