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126 lines
4.0 KiB
126 lines
4.0 KiB
/*
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* Copyright (C) 2020 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 "media/ShmemCompat.h"
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#include "binder/MemoryBase.h"
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#include "binder/MemoryHeapBase.h"
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#include "media/ShmemUtil.h"
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namespace android {
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namespace media {
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bool convertSharedFileRegionToIMemory(const SharedFileRegion& shmem,
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sp<IMemory>* result) {
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assert(result != nullptr);
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if (!validateSharedFileRegion(shmem)) {
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return false;
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}
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// Heap offset and size must be page aligned.
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const size_t pageSize = getpagesize();
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const size_t pageMask = ~(pageSize - 1);
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// OK if this wraps.
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const uint64_t endOffset = static_cast<uint64_t>(shmem.offset) +
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static_cast<uint64_t>(shmem.size);
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// Round down to page boundary.
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const uint64_t heapStartOffset = shmem.offset & pageMask;
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// Round up to page boundary.
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const uint64_t heapEndOffset = (endOffset + pageSize - 1) & pageMask;
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const uint64_t heapSize = heapEndOffset - heapStartOffset;
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if (heapStartOffset > std::numeric_limits<size_t>::max() ||
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heapSize > std::numeric_limits<size_t>::max()) {
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return false;
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}
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uint32_t flags = !shmem.writeable ? IMemoryHeap::READ_ONLY : 0;
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const sp<MemoryHeapBase> heap =
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new MemoryHeapBase(shmem.fd.get(), heapSize, flags, heapStartOffset);
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*result = sp<MemoryBase>::make(heap,
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shmem.offset - heapStartOffset,
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shmem.size);
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return true;
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}
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bool convertIMemoryToSharedFileRegion(const sp<IMemory>& mem,
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SharedFileRegion* result) {
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assert(mem != nullptr);
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assert(result != nullptr);
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*result = SharedFileRegion();
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ssize_t offset;
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size_t size;
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sp<IMemoryHeap> heap = mem->getMemory(&offset, &size);
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if (size > 0) {
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if (heap == nullptr) {
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return false;
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}
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// Make sure the offset and size do not overflow from int64 boundaries.
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if (size > std::numeric_limits<int64_t>::max() ||
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offset > std::numeric_limits<int64_t>::max() ||
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heap->getOffset() > std::numeric_limits<int64_t>::max() ||
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static_cast<uint64_t>(heap->getOffset()) +
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static_cast<uint64_t>(offset)
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> std::numeric_limits<int64_t>::max()) {
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return false;
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}
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const int fd = fcntl(heap->getHeapID(), F_DUPFD_CLOEXEC, 0);
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if (fd < 0) {
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return false;
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}
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result->fd.reset(base::unique_fd(fd));
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result->size = size;
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result->offset = heap->getOffset() + offset;
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result->writeable = (heap->getFlags() & IMemoryHeap::READ_ONLY) == 0;
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}
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return true;
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}
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bool convertNullableSharedFileRegionToIMemory(const std::optional<SharedFileRegion>& shmem,
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sp<IMemory>* result) {
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assert(result != nullptr);
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if (!shmem.has_value()) {
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result->clear();
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return true;
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}
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return convertSharedFileRegionToIMemory(shmem.value(), result);
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}
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bool convertNullableIMemoryToSharedFileRegion(const sp<IMemory>& mem,
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std::optional<SharedFileRegion>* result) {
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assert(result != nullptr);
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if (mem == nullptr) {
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result->reset();
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return true;
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}
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result->emplace();
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return convertIMemoryToSharedFileRegion(mem, &result->value());
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}
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} // namespace media
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} // namespace android
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