55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "mojo/public/cpp/system/buffer.h"
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namespace mojo {
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// static
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ScopedSharedBufferHandle SharedBufferHandle::Create(uint64_t num_bytes) {
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MojoCreateSharedBufferOptions options = {sizeof(options),
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MOJO_CREATE_SHARED_BUFFER_FLAG_NONE};
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SharedBufferHandle handle;
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MojoCreateSharedBuffer(num_bytes, &options, handle.mutable_value());
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return MakeScopedHandle(handle);
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}
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ScopedSharedBufferHandle SharedBufferHandle::Clone(
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SharedBufferHandle::AccessMode access_mode) const {
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ScopedSharedBufferHandle result;
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if (!is_valid())
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return result;
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MojoDuplicateBufferHandleOptions options = {
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sizeof(options), MOJO_DUPLICATE_BUFFER_HANDLE_FLAG_NONE};
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if (access_mode == AccessMode::READ_ONLY)
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options.flags |= MOJO_DUPLICATE_BUFFER_HANDLE_FLAG_READ_ONLY;
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SharedBufferHandle result_handle;
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MojoDuplicateBufferHandle(value(), &options, result_handle.mutable_value());
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result.reset(result_handle);
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return result;
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}
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ScopedSharedBufferMapping SharedBufferHandle::Map(uint64_t size) const {
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return MapAtOffset(size, 0);
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}
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ScopedSharedBufferMapping SharedBufferHandle::MapAtOffset(
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uint64_t size,
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uint64_t offset) const {
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void* buffer = nullptr;
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MojoMapBuffer(value(), offset, size, nullptr, &buffer);
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return ScopedSharedBufferMapping(buffer);
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}
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uint64_t SharedBufferHandle::GetSize() const {
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MojoSharedBufferInfo buffer_info;
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buffer_info.struct_size = sizeof(buffer_info);
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return MojoGetBufferInfo(value(), nullptr, &buffer_info) == MOJO_RESULT_OK
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? buffer_info.size
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: 0;
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}
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} // namespace mojo
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