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authorxunchang <xunchang@google.com>2019-03-23 00:08:52 +0100
committerxunchang <xunchang@google.com>2019-03-29 18:27:51 +0100
commit2478885f3ca47fe2c4073df1100f7bd6ad4931af (patch)
tree7bad452d0d5b0ae6eca9adf18c7bf8b8966a318f /install/include/private/asn1_decoder.h
parentMerge "Use flags = 0 to avoid fd closing for child updater process" (diff)
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Diffstat (limited to 'install/include/private/asn1_decoder.h')
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diff --git a/install/include/private/asn1_decoder.h b/install/include/private/asn1_decoder.h
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+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef ASN1_DECODER_H_
+#define ASN1_DECODER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+class asn1_context {
+ public:
+ asn1_context(const uint8_t* buffer, size_t length) : p_(buffer), length_(length), app_type_(0) {}
+ int asn1_constructed_type() const;
+ asn1_context* asn1_constructed_get();
+ bool asn1_constructed_skip_all();
+ asn1_context* asn1_sequence_get();
+ asn1_context* asn1_set_get();
+ bool asn1_sequence_next();
+ bool asn1_oid_get(const uint8_t** oid, size_t* length);
+ bool asn1_octet_string_get(const uint8_t** octet_string, size_t* length);
+
+ private:
+ static constexpr int kMaskConstructed = 0xE0;
+ static constexpr int kMaskTag = 0x7F;
+ static constexpr int kMaskAppType = 0x1F;
+
+ static constexpr int kTagOctetString = 0x04;
+ static constexpr int kTagOid = 0x06;
+ static constexpr int kTagSequence = 0x30;
+ static constexpr int kTagSet = 0x31;
+ static constexpr int kTagConstructed = 0xA0;
+
+ int peek_byte() const;
+ int get_byte();
+ bool skip_bytes(size_t num_skip);
+ bool decode_length(size_t* out_len);
+
+ const uint8_t* p_;
+ size_t length_;
+ int app_type_;
+};
+
+#endif /* ASN1_DECODER_H_ */