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89 lines
2.9 KiB
89 lines
2.9 KiB
4 months ago
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "standard_dex_file.h"
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#include "base/casts.h"
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#include "base/leb128.h"
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#include "code_item_accessors-inl.h"
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#include "dex_file-inl.h"
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namespace art {
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const uint8_t StandardDexFile::kDexMagic[] = { 'd', 'e', 'x', '\n' };
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const uint8_t StandardDexFile::kDexMagicVersions[StandardDexFile::kNumDexVersions]
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[StandardDexFile::kDexVersionLen] = {
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{'0', '3', '5', '\0'},
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// Dex version 036 skipped because of an old dalvik bug on some versions of android where dex
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// files with that version number would erroneously be accepted and run.
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{'0', '3', '7', '\0'},
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// Dex version 038: Android "O" and beyond.
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{'0', '3', '8', '\0'},
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// Dex version 039: Android "P" and beyond.
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{'0', '3', '9', '\0'},
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// Dex version 040: beyond Android "10" (previously known as Android "Q").
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{'0', '4', '0', '\0'},
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};
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void StandardDexFile::WriteMagic(uint8_t* magic) {
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std::copy_n(kDexMagic, kDexMagicSize, magic);
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}
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void StandardDexFile::WriteCurrentVersion(uint8_t* magic) {
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std::copy_n(kDexMagicVersions[StandardDexFile::kDexVersionLen - 1],
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kDexVersionLen,
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magic + kDexMagicSize);
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}
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void StandardDexFile::WriteVersionBeforeDefaultMethods(uint8_t* magic) {
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std::copy_n(kDexMagicVersions[0u], kDexVersionLen, magic + kDexMagicSize);
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}
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bool StandardDexFile::IsMagicValid(const uint8_t* magic) {
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return (memcmp(magic, kDexMagic, sizeof(kDexMagic)) == 0);
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}
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bool StandardDexFile::IsVersionValid(const uint8_t* magic) {
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const uint8_t* version = &magic[sizeof(kDexMagic)];
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for (uint32_t i = 0; i < kNumDexVersions; i++) {
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if (memcmp(version, kDexMagicVersions[i], kDexVersionLen) == 0) {
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return true;
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}
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}
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return false;
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}
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bool StandardDexFile::IsMagicValid() const {
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return IsMagicValid(header_->magic_);
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}
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bool StandardDexFile::IsVersionValid() const {
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return IsVersionValid(header_->magic_);
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}
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bool StandardDexFile::SupportsDefaultMethods() const {
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return GetDexVersion() >= DexFile::kDefaultMethodsVersion;
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}
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uint32_t StandardDexFile::GetCodeItemSize(const dex::CodeItem& item) const {
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DCHECK(IsInDataSection(&item));
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return reinterpret_cast<uintptr_t>(CodeItemDataAccessor(*this, &item).CodeItemDataEnd()) -
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reinterpret_cast<uintptr_t>(&item);
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}
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} // namespace art
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