1 /**
2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "class_data_accessor.h"
17
18 namespace panda::panda_file {
19
ClassDataAccessor(const File & panda_file,File::EntityId class_id)20 ClassDataAccessor::ClassDataAccessor(const File &panda_file, File::EntityId class_id)
21 : panda_file_(panda_file), class_id_(class_id), name_(), num_fields_(0), num_methods_(0), num_ifaces_(0), size_(0)
22 {
23 ASSERT(!panda_file.IsExternal(class_id));
24 auto sp = panda_file_.GetSpanFromId(class_id_);
25 name_.utf16_length = helpers::ReadULeb128(&sp);
26 name_.data = sp.data();
27
28 size_t size = utf::Mutf8Size(name_.data) + 1; // + 1 for null byte
29 panda_file_.ThrowIfWithCheck(sp.Size() < size, File::INVALID_FILE_OFFSET, File::CLASS_DATA_ACCESSOR);
30 sp = sp.SubSpan(size);
31
32 super_class_off_ = helpers::Read<ID_SIZE>(&sp);
33
34 access_flags_ = helpers::ReadULeb128(&sp);
35 num_fields_ = helpers::ReadULeb128(&sp);
36 num_methods_ = helpers::ReadULeb128(&sp);
37
38 panda_file_.ThrowIfWithCheck(sp.Size() == 0U, File::INVALID_FILE_OFFSET, File::CLASS_DATA_ACCESSOR);
39 auto tag = static_cast<ClassTag>(sp[0]);
40
41 while (tag != ClassTag::NOTHING && tag < ClassTag::SOURCE_LANG) {
42 panda_file_.ThrowIfWithCheck(sp.Size() == 0U, File::INVALID_FILE_OFFSET, File::CLASS_DATA_ACCESSOR);
43 sp = sp.SubSpan(1);
44
45 if (tag == ClassTag::INTERFACES) {
46 num_ifaces_ = helpers::ReadULeb128(&sp);
47 ifaces_offsets_sp_ = sp;
48 size_t scale = IDX_SIZE * num_ifaces_;
49 panda_file_.ThrowIfWithCheck(sp.Size() < scale, File::INVALID_FILE_OFFSET, File::CLASS_DATA_ACCESSOR);
50 sp = sp.SubSpan(scale);
51 }
52
53 panda_file_.ThrowIfWithCheck(sp.Size() == 0U, File::INVALID_FILE_OFFSET, File::CLASS_DATA_ACCESSOR);
54 tag = static_cast<ClassTag>(sp[0]);
55 }
56
57 source_lang_sp_ = sp;
58
59 if (tag == ClassTag::NOTHING) {
60 annotations_sp_ = sp;
61 source_file_sp_ = sp;
62 panda_file_.ThrowIfWithCheck(sp.Size() < TAG_SIZE, File::INVALID_FILE_OFFSET, File::CLASS_DATA_ACCESSOR);
63 fields_sp_ = sp.SubSpan(TAG_SIZE); // skip NOTHING tag
64 }
65 }
66
67 } // namespace panda::panda_file
68