1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* Copyright (C) 2017 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 "standard_dex_file.h"
#include "base/casts.h"
#include "base/leb128.h"
#include "code_item_accessors-inl.h"
#include "dex_file-inl.h"
namespace art {
const uint8_t StandardDexFile::kDexMagic[] = { 'd', 'e', 'x', '\n' };
const uint8_t StandardDexFile::kDexMagicVersions[StandardDexFile::kNumDexVersions]
[StandardDexFile::kDexVersionLen] = {
{'0', '3', '5', '\0'},
// Dex version 036 skipped because of an old dalvik bug on some versions of android where dex
// files with that version number would erroneously be accepted and run.
{'0', '3', '7', '\0'},
// Dex version 038: Android "O" and beyond.
{'0', '3', '8', '\0'},
// Dex version 039: Android "P" and beyond.
{'0', '3', '9', '\0'},
// Dex version 040: beyond Android "10" (previously known as Android "Q").
{'0', '4', '0', '\0'},
};
void StandardDexFile::WriteMagic(uint8_t* magic) {
std::copy_n(kDexMagic, kDexMagicSize, magic);
}
void StandardDexFile::WriteCurrentVersion(uint8_t* magic) {
std::copy_n(kDexMagicVersions[StandardDexFile::kDexVersionLen - 1],
kDexVersionLen,
magic + kDexMagicSize);
}
void StandardDexFile::WriteVersionBeforeDefaultMethods(uint8_t* magic) {
std::copy_n(kDexMagicVersions[0u], kDexVersionLen, magic + kDexMagicSize);
}
bool StandardDexFile::IsMagicValid(const uint8_t* magic) {
return (memcmp(magic, kDexMagic, sizeof(kDexMagic)) == 0);
}
bool StandardDexFile::IsVersionValid(const uint8_t* magic) {
const uint8_t* version = &magic[sizeof(kDexMagic)];
for (uint32_t i = 0; i < kNumDexVersions; i++) {
if (memcmp(version, kDexMagicVersions[i], kDexVersionLen) == 0) {
return true;
}
}
return false;
}
bool StandardDexFile::IsMagicValid() const {
return IsMagicValid(header_->magic_);
}
bool StandardDexFile::IsVersionValid() const {
return IsVersionValid(header_->magic_);
}
bool StandardDexFile::SupportsDefaultMethods() const {
return GetDexVersion() >= DexFile::kDefaultMethodsVersion;
}
uint32_t StandardDexFile::GetCodeItemSize(const dex::CodeItem& item) const {
DCHECK(IsInDataSection(&item));
return reinterpret_cast<uintptr_t>(CodeItemDataAccessor(*this, &item).CodeItemDataEnd()) -
reinterpret_cast<uintptr_t>(&item);
}
} // namespace art
|
