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/*
* Copyright (C) 2014 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 <androidfw/TypeWrappers.h>
namespace android {
TypeVariant::iterator& TypeVariant::iterator::operator++() {
mIndex++;
if (mIndex > dtohl(mTypeVariant->data->entryCount)) {
mIndex = dtohl(mTypeVariant->data->entryCount);
}
return *this;
}
const ResTable_entry* TypeVariant::iterator::operator*() const {
const ResTable_type* type = mTypeVariant->data;
const uint32_t entryCount = dtohl(type->entryCount);
if (mIndex >= entryCount) {
return NULL;
}
const uintptr_t containerEnd = reinterpret_cast<uintptr_t>(type)
+ dtohl(type->header.size);
const uint32_t* const entryIndices = reinterpret_cast<const uint32_t*>(
reinterpret_cast<uintptr_t>(type) + dtohs(type->header.headerSize));
if (reinterpret_cast<uintptr_t>(entryIndices) + (sizeof(uint32_t) * entryCount) > containerEnd) {
ALOGE("Type's entry indices extend beyond its boundaries");
return NULL;
}
const uint32_t entryOffset = dtohl(entryIndices[mIndex]);
if (entryOffset == ResTable_type::NO_ENTRY) {
return NULL;
}
if ((entryOffset & 0x3) != 0) {
ALOGE("Index %u points to entry with unaligned offset 0x%08x", mIndex, entryOffset);
return NULL;
}
const ResTable_entry* entry = reinterpret_cast<const ResTable_entry*>(
reinterpret_cast<uintptr_t>(type) + dtohl(type->entriesStart) + entryOffset);
if (reinterpret_cast<uintptr_t>(entry) > containerEnd - sizeof(*entry)) {
ALOGE("Entry offset at index %u points outside the Type's boundaries", mIndex);
return NULL;
} else if (reinterpret_cast<uintptr_t>(entry) + dtohs(entry->size) > containerEnd) {
ALOGE("Entry at index %u extends beyond Type's boundaries", mIndex);
return NULL;
} else if (dtohs(entry->size) < sizeof(*entry)) {
ALOGE("Entry at index %u is too small (%u)", mIndex, dtohs(entry->size));
return NULL;
}
return entry;
}
} // namespace android
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