[dice] Move error type to upstream library libdiced_open_dice
This is part of the project of merging the two existing dice
wrapper libraries into one library. The upstream library
libdiced_open_dice will be the merged library.
Test: atest diced_utils_test diced_sample_inputs_test \
diced_test diced_vendor_test
Test: m pvmfw_img microdroid_manager && atest \
microdroid_manager_test
Bug: 267575445
Change-Id: I584dd2f91996d376dff354564b43321ef6535303
diff --git a/diced/open_dice/src/error.rs b/diced/open_dice/src/error.rs
new file mode 100644
index 0000000..9cf2ae8
--- /dev/null
+++ b/diced/open_dice/src/error.rs
@@ -0,0 +1,78 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Errors and relating functions thrown in this library.
+
+use open_dice_cbor_bindgen::DiceResult;
+use std::{fmt, result};
+
+#[cfg(feature = "std")]
+use std::error::Error;
+
+/// Error type used by DICE.
+#[derive(Debug)]
+pub enum DiceError {
+ /// Provided input was invalid.
+ InvalidInput,
+ /// Provided buffer was too small.
+ BufferTooSmall,
+ /// Platform error.
+ PlatformError,
+ /// Input string has an interior nul byte.
+ /// TODO(b/267575445): Remove this error once we change the param of
+ /// `format_config_descriptor to take &CStr.
+ #[cfg(feature = "std")]
+ CStrNulError,
+ /// The allocation of a ZVec failed.
+ #[cfg(feature = "std")]
+ ZVecError(keystore2_crypto::zvec::Error),
+}
+
+#[cfg(feature = "std")]
+impl From<keystore2_crypto::zvec::Error> for DiceError {
+ fn from(e: keystore2_crypto::zvec::Error) -> Self {
+ Self::ZVecError(e)
+ }
+}
+
+/// This makes `DiceError` accepted by anyhow.
+#[cfg(feature = "std")]
+impl Error for DiceError {}
+
+impl fmt::Display for DiceError {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self {
+ Self::InvalidInput => write!(f, "invalid input"),
+ Self::BufferTooSmall => write!(f, "buffer too small"),
+ Self::PlatformError => write!(f, "platform error"),
+ #[cfg(feature = "std")]
+ Self::CStrNulError => write!(f, "input string has an interior nul byte"),
+ #[cfg(feature = "std")]
+ Self::ZVecError(e) => write!(f, "ZVec allocation failed {e}"),
+ }
+ }
+}
+
+/// DICE result type.
+pub type Result<T> = result::Result<T, DiceError>;
+
+/// Checks the given `DiceResult`. Returns an error if it's not OK.
+pub fn check_result(result: DiceResult) -> Result<()> {
+ match result {
+ DiceResult::kDiceResultOk => Ok(()),
+ DiceResult::kDiceResultInvalidInput => Err(DiceError::InvalidInput),
+ DiceResult::kDiceResultBufferTooSmall => Err(DiceError::BufferTooSmall),
+ DiceResult::kDiceResultPlatformError => Err(DiceError::PlatformError),
+ }
+}