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/*
* Copyright 2019 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 "fields/payload_field.h"
#include "util.h"
const std::string PayloadField::kFieldType = "PayloadField";
PayloadField::PayloadField(std::string modifier, ParseLocation loc)
: PacketField("payload", loc), size_field_(nullptr), size_modifier_(modifier) {}
void PayloadField::SetSizeField(const SizeField* size_field) {
if (size_field_ != nullptr) {
ERROR(this, size_field_, size_field) << "The size field for the payload has already been assigned.";
}
size_field_ = size_field;
}
const std::string& PayloadField::GetFieldType() const {
return PayloadField::kFieldType;
}
Size PayloadField::GetSize() const {
if (size_field_ == nullptr) {
if (!size_modifier_.empty()) {
ERROR(this) << "Missing size field for payload with size modifier.";
}
return Size();
}
std::string dynamic_size = "(Get" + util::UnderscoreToCamelCase(size_field_->GetName()) + "() * 8)";
if (!size_modifier_.empty()) {
dynamic_size += "- (" + size_modifier_ + ")";
}
return dynamic_size;
}
std::string PayloadField::GetDataType() const {
return "PacketView";
}
void PayloadField::GenExtractor(std::ostream&, int, bool) const {
ERROR(this) << __func__ << " should never be called. ";
}
std::string PayloadField::GetGetterFunctionName() const {
return "GetPayload";
}
void PayloadField::GenGetter(std::ostream& s, Size start_offset, Size end_offset) const {
s << "PacketView<kLittleEndian> " << GetGetterFunctionName() << "() const {";
s << "ASSERT(was_validated_);";
s << "size_t end_index = size();";
s << "auto to_bound = begin();";
GenBounds(s, start_offset, end_offset, GetSize());
s << "return GetLittleEndianSubview(field_begin, field_end);";
s << "}\n\n";
s << "PacketView<!kLittleEndian> " << GetGetterFunctionName() << "BigEndian() const {";
s << "ASSERT(was_validated_);";
s << "size_t end_index = size();";
s << "auto to_bound = begin();";
GenBounds(s, start_offset, end_offset, GetSize());
s << "return GetBigEndianSubview(field_begin, field_end);";
s << "}\n";
}
std::string PayloadField::GetBuilderParameterType() const {
return "std::unique_ptr<BasePacketBuilder>";
}
bool PayloadField::BuilderParameterMustBeMoved() const {
return true;
}
void PayloadField::GenBuilderParameterFromView(std::ostream& s) const {
s << "std::make_unique<RawBuilder>(std::vector<uint8_t>(view.GetPayload().begin(), view.GetPayload().end()))";
}
bool PayloadField::HasParameterValidator() const {
return false;
}
void PayloadField::GenParameterValidator(std::ostream&) const {
// There is no validation needed for a payload
}
void PayloadField::GenInserter(std::ostream&) const {
ERROR() << __func__ << " Should never be called.";
}
void PayloadField::GenValidator(std::ostream&) const {
// Do nothing
}
void PayloadField::GenStringRepresentation(std::ostream& s, std::string) const {
// TODO: we should parse the child packets
s << "\"PAYLOAD[]\"";
}
std::string PayloadField::GetRustDataType() const {
return "Vec::<u8>";
}
void PayloadField::GenBoundsCheck(std::ostream& s, Size start_offset, Size, std::string parent_name) const {
if (size_field_ != nullptr) {
s << "let want_ = " << start_offset.bytes() << " + (" << size_field_->GetName() << " as usize)";
if (!size_modifier_.empty()) {
s << " - ((" << size_modifier_.substr(1) << ") / 8)";
}
s << ";";
s << "if bytes.len() < want_ {";
s << " return Err(Error::InvalidLengthError{";
s << " obj: \"" << parent_name << "\".to_string(),";
s << " field: \"" << GetName() << "\".to_string(),";
s << " wanted: want_,";
s << " got: bytes.len()});";
s << "}";
if (!size_modifier_.empty()) {
s << "if ((" << size_field_->GetName() << " as usize) < ((" << size_modifier_.substr(1) << ") / 8)) {";
s << " return Err(Error::ImpossibleStructError);";
s << "}";
}
}
}
void PayloadField::GenRustGetter(std::ostream& s, Size start_offset, Size, std::string) const {
s << "let " << GetName() << ": " << GetRustDataType() << " = ";
if (size_field_ == nullptr) {
s << "bytes[" << start_offset.bytes() << "..].into();";
} else {
s << "bytes[" << start_offset.bytes() << "..(";
s << start_offset.bytes() << " + " << size_field_->GetName() << " as usize)].into();";
}
}
void PayloadField::GenRustWriter(std::ostream&, Size, Size) const {}
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