| /* |
| * Copyright (C) 2016 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 "vdex_file.h" |
| |
| #include <memory> |
| |
| #include "base/logging.h" |
| #include "base/unix_file/fd_file.h" |
| #include "dex_file.h" |
| |
| namespace art { |
| |
| constexpr uint8_t VdexFile::Header::kVdexMagic[4]; |
| constexpr uint8_t VdexFile::Header::kVdexVersion[4]; |
| |
| bool VdexFile::Header::IsMagicValid() const { |
| return (memcmp(magic_, kVdexMagic, sizeof(kVdexMagic)) == 0); |
| } |
| |
| bool VdexFile::Header::IsVersionValid() const { |
| return (memcmp(version_, kVdexVersion, sizeof(kVdexVersion)) == 0); |
| } |
| |
| VdexFile::Header::Header(uint32_t number_of_dex_files, |
| uint32_t dex_size, |
| uint32_t verifier_deps_size, |
| uint32_t quickening_info_size) |
| : number_of_dex_files_(number_of_dex_files), |
| dex_size_(dex_size), |
| verifier_deps_size_(verifier_deps_size), |
| quickening_info_size_(quickening_info_size) { |
| memcpy(magic_, kVdexMagic, sizeof(kVdexMagic)); |
| memcpy(version_, kVdexVersion, sizeof(kVdexVersion)); |
| DCHECK(IsMagicValid()); |
| DCHECK(IsVersionValid()); |
| } |
| |
| std::unique_ptr<VdexFile> VdexFile::Open(const std::string& vdex_filename, |
| bool writable, |
| bool low_4gb, |
| std::string* error_msg) { |
| if (!OS::FileExists(vdex_filename.c_str())) { |
| *error_msg = "File " + vdex_filename + " does not exist."; |
| return nullptr; |
| } |
| |
| std::unique_ptr<File> vdex_file; |
| if (writable) { |
| vdex_file.reset(OS::OpenFileReadWrite(vdex_filename.c_str())); |
| } else { |
| vdex_file.reset(OS::OpenFileForReading(vdex_filename.c_str())); |
| } |
| if (vdex_file == nullptr) { |
| *error_msg = "Could not open file " + vdex_filename + |
| (writable ? " for read/write" : "for reading"); |
| return nullptr; |
| } |
| |
| int64_t vdex_length = vdex_file->GetLength(); |
| if (vdex_length == -1) { |
| *error_msg = "Could not read the length of file " + vdex_filename; |
| return nullptr; |
| } |
| |
| return Open(vdex_file->Fd(), vdex_length, vdex_filename, writable, low_4gb, error_msg); |
| } |
| |
| std::unique_ptr<VdexFile> VdexFile::Open(int file_fd, |
| size_t vdex_length, |
| const std::string& vdex_filename, |
| bool writable, |
| bool low_4gb, |
| std::string* error_msg) { |
| std::unique_ptr<MemMap> mmap(MemMap::MapFile(vdex_length, |
| writable ? PROT_READ | PROT_WRITE : PROT_READ, |
| MAP_SHARED, |
| file_fd, |
| 0 /* start offset */, |
| low_4gb, |
| vdex_filename.c_str(), |
| error_msg)); |
| if (mmap == nullptr) { |
| *error_msg = "Failed to mmap file " + vdex_filename + " : " + *error_msg; |
| return nullptr; |
| } |
| |
| std::unique_ptr<VdexFile> vdex(new VdexFile(mmap.release())); |
| if (!vdex->IsValid()) { |
| *error_msg = "Vdex file is not valid"; |
| return nullptr; |
| } |
| |
| *error_msg = "Success"; |
| return vdex; |
| } |
| |
| const uint8_t* VdexFile::GetNextDexFileData(const uint8_t* cursor) const { |
| DCHECK(cursor == nullptr || (cursor > Begin() && cursor <= End())); |
| if (cursor == nullptr) { |
| // Beginning of the iteration, return the first dex file if there is one. |
| return HasDexSection() ? DexBegin() : nullptr; |
| } else { |
| // Fetch the next dex file. Return null if there is none. |
| const uint8_t* data = cursor + reinterpret_cast<const DexFile::Header*>(cursor)->file_size_; |
| return (data == DexEnd()) ? nullptr : data; |
| } |
| } |
| |
| bool VdexFile::OpenAllDexFiles(std::vector<std::unique_ptr<const DexFile>>* dex_files, |
| std::string* error_msg) { |
| size_t i = 0; |
| for (const uint8_t* dex_file_start = GetNextDexFileData(nullptr); |
| dex_file_start != nullptr; |
| dex_file_start = GetNextDexFileData(dex_file_start), ++i) { |
| size_t size = reinterpret_cast<const DexFile::Header*>(dex_file_start)->file_size_; |
| // TODO: Supply the location information for a vdex file. |
| static constexpr char kVdexLocation[] = ""; |
| std::string location = DexFile::GetMultiDexLocation(i, kVdexLocation); |
| std::unique_ptr<const DexFile> dex(DexFile::Open(dex_file_start, |
| size, |
| location, |
| GetLocationChecksum(i), |
| nullptr /*oat_dex_file*/, |
| false /*verify*/, |
| false /*verify_checksum*/, |
| error_msg)); |
| if (dex == nullptr) { |
| return false; |
| } |
| dex_files->push_back(std::move(dex)); |
| } |
| return true; |
| } |
| |
| } // namespace art |