// Copyright 2018 The Fuchsia 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 "lib/fidl/cpp/encoder.h"
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#include <zircon/assert.h>
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#include <zircon/fidl.h>
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namespace fidl {
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namespace {
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size_t Align(size_t size) {
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constexpr size_t alignment_mask = FIDL_ALIGNMENT - 1;
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return (size + alignment_mask) & ~alignment_mask;
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}
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} // namespace
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Encoder::Encoder(uint32_t ordinal) { EncodeMessageHeader(ordinal); }
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Encoder::~Encoder() = default;
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size_t Encoder::Alloc(size_t size) {
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size_t offset = bytes_.size();
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size_t new_size = bytes_.size() + Align(size);
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ZX_ASSERT(new_size >= offset);
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bytes_.resize(new_size);
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return offset;
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}
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#ifdef __Fuchsia__
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void Encoder::EncodeHandle(zx::object_base* value, size_t offset) {
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if (value->is_valid()) {
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*GetPtr<zx_handle_t>(offset) = FIDL_HANDLE_PRESENT;
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handles_.push_back(value->release());
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} else {
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*GetPtr<zx_handle_t>(offset) = FIDL_HANDLE_ABSENT;
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}
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}
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#endif
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Message Encoder::GetMessage() {
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return Message(BytePart(bytes_.data(), bytes_.size(), bytes_.size()),
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HandlePart(handles_.data(), handles_.size(), handles_.size()));
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}
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void Encoder::Reset(uint32_t ordinal) {
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bytes_.clear();
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handles_.clear();
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EncodeMessageHeader(ordinal);
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}
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void Encoder::EncodeMessageHeader(uint32_t ordinal) {
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size_t offset = Alloc(sizeof(fidl_message_header_t));
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fidl_message_header_t* header = GetPtr<fidl_message_header_t>(offset);
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header->ordinal = ordinal;
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}
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} // namespace fidl
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