1 /* 2 ** 3 ** Copyright 2016, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #ifndef KEYSTORE_KEYSTORE_AIDL_HIDL_MARSHALLING_UTILS_H_ 19 #define KEYSTORE_KEYSTORE_AIDL_HIDL_MARSHALLING_UTILS_H_ 20 21 #include <utility> 22 23 #include <binder/Parcel.h> 24 25 #include <keystore/keymaster_types.h> 26 27 namespace keystore { 28 29 template <typename Fn, typename... Args> 30 inline auto nullable(Fn fn, const android::Parcel& in, Args&&... args) 31 -> NullOr<decltype(fn(in, std::forward<Args>(args)...))> { 32 if (in.readInt32() != 1) { 33 return {}; 34 } 35 36 return fn(in, std::forward<Args>(args)...); 37 } 38 template <typename Fn, typename Arg> 39 inline android::status_t nullable(Fn fn, const NullOr<Arg>& arg, android::Parcel* out) { 40 if (!arg.isOk()) { 41 return out->writeInt32(0); 42 } 43 auto rc = out->writeInt32(1); 44 if (rc != ::android::OK) return rc; 45 46 return fn(arg.value(), out); 47 } 48 template <typename Fn, typename Arg> 49 inline android::status_t nullable(Fn fn, Arg&& arg, android::Parcel* out) { 50 auto rc = out->writeInt32(1); 51 if (rc != ::android::OK) return rc; 52 53 return fn(std::forward<Arg>(arg), out); 54 } 55 56 inline android::status_t nullable(android::Parcel* out) { 57 return out->writeInt32(0); 58 } 59 60 /** 61 * makes a copy only if inPlace is false 62 */ 63 hidl_vec<uint8_t> readKeymasterBlob(const android::Parcel& in, bool inPlace = true); 64 android::status_t writeKeymasterBlob(const hidl_vec<uint8_t>& blob, android::Parcel* out); 65 66 NullOr<hidl_vec<uint8_t>> readBlobAsByteArray(const android::Parcel& in, bool inPlace = true); 67 android::status_t writeBlobAsByteArray(const NullOr<const hidl_vec<uint8_t>&>& blob, 68 android::Parcel* out); 69 70 NullOr<KeyParameter> readKeyParameterFromParcel(const android::Parcel& in); 71 android::status_t writeKeyParameterToParcel(const KeyParameter& param, android::Parcel* out); 72 73 hidl_vec<KeyParameter> readParamSetFromParcel(const android::Parcel& in); 74 android::status_t writeParamSetToParcel(const hidl_vec<KeyParameter>& params, android::Parcel* out); 75 76 hidl_vec<hidl_vec<uint8_t>> readCertificateChainFromParcel(const android::Parcel& in); 77 } 78 79 #endif // KEYSTORE_KEYSTORE_AIDL_HIDL_MARSHALLING_UTILS_H_ 80
