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/*
* Copyright (C) 2019 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 "package.h"
#include <string.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <openssl/sha.h>
#include "otautil/error_code.h"
#include "otautil/sysutil.h"
// This class wraps the package in memory, i.e. a memory mapped package, or a package loaded
// to a string/vector.
class MemoryPackage : public Package {
public:
// Constructs the class from a file. We will memory maps the file later.
MemoryPackage(const std::string& path, std::unique_ptr<MemMapping> map,
const std::function<void(float)>& set_progress);
// Constructs the class from the package bytes in |content|.
MemoryPackage(std::vector<uint8_t> content, const std::function<void(float)>& set_progress);
~MemoryPackage() override;
// Memory maps the package file if necessary. Initializes the start address and size of the
// package.
uint64_t GetPackageSize() const override {
return package_size_;
}
bool ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) override;
ZipArchiveHandle GetZipArchiveHandle() override;
bool UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, uint64_t start,
uint64_t length) override;
private:
const uint8_t* addr_; // Start address of the package in memory.
uint64_t package_size_; // Package size in bytes.
// The memory mapped package.
std::unique_ptr<MemMapping> map_;
// A copy of the package content, valid only if we create the class with the exact bytes of
// the package.
std::vector<uint8_t> package_content_;
// The physical path to the package, empty if we create the class with the package content.
std::string path_;
// The ZipArchiveHandle of the package.
ZipArchiveHandle zip_handle_;
};
// TODO(xunchang) Implement the PackageFromFd.
void Package::SetProgress(float progress) {
if (set_progress_) {
set_progress_(progress);
}
}
std::unique_ptr<Package> Package::CreateMemoryPackage(
const std::string& path, const std::function<void(float)>& set_progress) {
std::unique_ptr<MemMapping> mmap = std::make_unique<MemMapping>();
if (!mmap->MapFile(path)) {
LOG(ERROR) << "failed to map file";
return nullptr;
}
return std::make_unique<MemoryPackage>(path, std::move(mmap), set_progress);
}
std::unique_ptr<Package> Package::CreateMemoryPackage(
std::vector<uint8_t> content, const std::function<void(float)>& set_progress) {
return std::make_unique<MemoryPackage>(std::move(content), set_progress);
}
MemoryPackage::MemoryPackage(const std::string& path, std::unique_ptr<MemMapping> map,
const std::function<void(float)>& set_progress)
: map_(std::move(map)), path_(path), zip_handle_(nullptr) {
addr_ = map_->addr;
package_size_ = map_->length;
set_progress_ = set_progress;
}
MemoryPackage::MemoryPackage(std::vector<uint8_t> content,
const std::function<void(float)>& set_progress)
: package_content_(std::move(content)), zip_handle_(nullptr) {
CHECK(!package_content_.empty());
addr_ = package_content_.data();
package_size_ = package_content_.size();
set_progress_ = set_progress;
}
MemoryPackage::~MemoryPackage() {
if (zip_handle_) {
CloseArchive(zip_handle_);
}
}
bool MemoryPackage::ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) {
if (byte_count > package_size_ || offset > package_size_ - byte_count) {
LOG(ERROR) << "Out of bound read, offset: " << offset << ", size: " << byte_count
<< ", total package_size: " << package_size_;
return false;
}
memcpy(buffer, addr_ + offset, byte_count);
return true;
}
bool MemoryPackage::UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers,
uint64_t start, uint64_t length) {
if (length > package_size_ || start > package_size_ - length) {
LOG(ERROR) << "Out of bound read, offset: " << start << ", size: " << length
<< ", total package_size: " << package_size_;
return false;
}
for (const auto& hasher : hashers) {
hasher(addr_ + start, length);
}
return true;
}
ZipArchiveHandle MemoryPackage::GetZipArchiveHandle() {
if (zip_handle_) {
return zip_handle_;
}
if (auto err = OpenArchiveFromMemory(const_cast<uint8_t*>(addr_), package_size_, path_.c_str(),
&zip_handle_);
err != 0) {
LOG(ERROR) << "Can't open package" << path_ << " : " << ErrorCodeString(err);
return nullptr;
}
return zip_handle_;
}
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