twrpinstall: create library for twrpinstall
This library will need to mirror AOSP for any changes to installing
packages. The library has been separated out in order to make importing
updates from AOSP into the TWRP project.
twinstall.cpp has been removed from the recovery binary and added to
this library. It has been refactored for libziparchive.
Sideload has been reworked to use the newer methods from AOSP on
flashing packages through adb sideload.
We are also removing old libraries for adb and verifier.
Lastly before flashing a zip or image, we want to unlock block devices
for writing so that when an OTA is flashed to the inactive slot,
the flash will succeed.
Change-Id: I6d8702fc9031ffaf9f666b4ba375dc7d9362e473
diff --git a/twrpinstall/asn1_decoder.cpp b/twrpinstall/asn1_decoder.cpp
new file mode 100644
index 0000000..2d81a6e
--- /dev/null
+++ b/twrpinstall/asn1_decoder.cpp
@@ -0,0 +1,156 @@
+/*
+ * 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;
+}