// Copyright 2017 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/coding.h>
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#include <stdalign.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <lib/fidl/internal.h>
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#include <zircon/assert.h>
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#include <zircon/compiler.h>
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#ifdef __Fuchsia__
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#include <zircon/syscalls.h>
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#endif
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#include "buffer_walker.h"
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// TODO(kulakowski) Design zx_status_t error values.
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namespace {
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class FidlDecoder final : public fidl::internal::BufferWalker<FidlDecoder, true, false> {
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typedef fidl::internal::BufferWalker<FidlDecoder, true, false> Super;
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public:
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FidlDecoder(const fidl_type_t* type, void* bytes, uint32_t num_bytes,
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const zx_handle_t* handles, uint32_t num_handles, const char** out_error_msg)
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: Super(type), bytes_(static_cast<uint8_t*>(bytes)), num_bytes_(num_bytes),
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handles_(handles), num_handles_(num_handles), out_error_msg_(out_error_msg) {}
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void Walk() {
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if (handles_ == nullptr && num_handles_ != 0u) {
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SetError("Cannot provide non-zero handle count and null handle pointer");
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return;
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}
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Super::Walk();
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if (status_ == ZX_OK && handle_idx() != num_handles()) {
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SetError("message did not contain the specified number of handles");
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}
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}
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uint8_t* bytes() const { return bytes_; }
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uint32_t num_bytes() const { return num_bytes_; }
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uint32_t num_handles() const { return num_handles_; }
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bool ValidateOutOfLineStorageClaim(const void* a, const void* b) {
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return true;
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}
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void UnclaimedHandle(zx_handle_t* out_handle) {}
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void ClaimedHandle(zx_handle_t* out_handle, uint32_t idx) {
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if (out_handle != nullptr) {
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*out_handle = handles_[idx];
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#ifdef __Fuchsia__
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} else {
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// Return value intentionally ignored: this is best-effort cleanup.
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zx_handle_close(handles_[idx]);
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#endif
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}
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}
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PointerState GetPointerState(const void* ptr) const {
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return static_cast<PointerState>(*static_cast<const uintptr_t*>(ptr));
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}
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HandleState GetHandleState(zx_handle_t p) const {
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return static_cast<HandleState>(p);
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}
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template <class T>
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void UpdatePointer(T* p, T v) {
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*p = v;
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}
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void SetError(const char* error_msg) {
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status_ = ZX_ERR_INVALID_ARGS;
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if (out_error_msg_ != nullptr) {
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*out_error_msg_ = error_msg;
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}
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#ifdef __Fuchsia__
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if (handles_) {
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// Return value intentionally ignored: this is best-effort cleanup.
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zx_handle_close_many(handles_, num_handles());
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}
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#endif
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}
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zx_status_t status() const { return status_; }
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private:
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uint8_t* const bytes_;
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const uint32_t num_bytes_;
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const zx_handle_t* const handles_;
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const uint32_t num_handles_;
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const char** const out_error_msg_;
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zx_status_t status_ = ZX_OK;
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};
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} // namespace
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zx_status_t fidl_decode(const fidl_type_t* type, void* bytes, uint32_t num_bytes,
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const zx_handle_t* handles, uint32_t num_handles,
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const char** out_error_msg) {
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FidlDecoder decoder(type, bytes, num_bytes, handles, num_handles, out_error_msg);
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decoder.Walk();
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return decoder.status();
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}
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zx_status_t fidl_decode_msg(const fidl_type_t* type, fidl_msg_t* msg,
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const char** out_error_msg) {
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return fidl_decode(type, msg->bytes, msg->num_bytes, msg->handles,
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msg->num_handles, out_error_msg);
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}
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