diff options
Diffstat (limited to 'install/asn1_decoder.cpp')
-rw-r--r-- | install/asn1_decoder.cpp | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/install/asn1_decoder.cpp b/install/asn1_decoder.cpp deleted file mode 100644 index 2d81a6e13..000000000 --- a/install/asn1_decoder.cpp +++ /dev/null @@ -1,156 +0,0 @@ -/* - * 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. - */ - -#include "private/asn1_decoder.h" - -int asn1_context::peek_byte() const { - if (length_ == 0) { - return -1; - } - return *p_; -} - -int asn1_context::get_byte() { - if (length_ == 0) { - return -1; - } - - int byte = *p_; - p_++; - length_--; - return byte; -} - -bool asn1_context::skip_bytes(size_t num_skip) { - if (length_ < num_skip) { - return false; - } - p_ += num_skip; - length_ -= num_skip; - return true; -} - -bool asn1_context::decode_length(size_t* out_len) { - int num_octets = get_byte(); - if (num_octets == -1) { - return false; - } - if ((num_octets & 0x80) == 0x00) { - *out_len = num_octets; - return true; - } - num_octets &= kMaskTag; - if (static_cast<size_t>(num_octets) >= sizeof(size_t)) { - return false; - } - size_t length = 0; - for (int i = 0; i < num_octets; ++i) { - int byte = get_byte(); - if (byte == -1) { - return false; - } - length <<= 8; - length += byte; - } - *out_len = length; - return true; -} - -/** - * Returns the constructed type and advances the pointer. E.g. A0 -> 0 - */ -asn1_context* asn1_context::asn1_constructed_get() { - int type = get_byte(); - if (type == -1 || (type & kMaskConstructed) != kTagConstructed) { - return nullptr; - } - size_t length; - if (!decode_length(&length) || length > length_) { - return nullptr; - } - asn1_context* app_ctx = new asn1_context(p_, length); - app_ctx->app_type_ = type & kMaskAppType; - return app_ctx; -} - -bool asn1_context::asn1_constructed_skip_all() { - int byte = peek_byte(); - while (byte != -1 && (byte & kMaskConstructed) == kTagConstructed) { - skip_bytes(1); - size_t length; - if (!decode_length(&length) || !skip_bytes(length)) { - return false; - } - byte = peek_byte(); - } - return byte != -1; -} - -int asn1_context::asn1_constructed_type() const { - return app_type_; -} - -asn1_context* asn1_context::asn1_sequence_get() { - if ((get_byte() & kMaskTag) != kTagSequence) { - return nullptr; - } - size_t length; - if (!decode_length(&length) || length > length_) { - return nullptr; - } - return new asn1_context(p_, length); -} - -asn1_context* asn1_context::asn1_set_get() { - if ((get_byte() & kMaskTag) != kTagSet) { - return nullptr; - } - size_t length; - if (!decode_length(&length) || length > length_) { - return nullptr; - } - return new asn1_context(p_, length); -} - -bool asn1_context::asn1_sequence_next() { - size_t length; - if (get_byte() == -1 || !decode_length(&length) || !skip_bytes(length)) { - return false; - } - return true; -} - -bool asn1_context::asn1_oid_get(const uint8_t** oid, size_t* length) { - if (get_byte() != kTagOid) { - return false; - } - if (!decode_length(length) || *length == 0 || *length > length_) { - return false; - } - *oid = p_; - return true; -} - -bool asn1_context::asn1_octet_string_get(const uint8_t** octet_string, size_t* length) { - if (get_byte() != kTagOctetString) { - return false; - } - if (!decode_length(length) || *length == 0 || *length > length_) { - return false; - } - *octet_string = p_; - return true; -} |