| /* |
| * 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/packet_field.h" |
| |
| #include "util.h" |
| |
| PacketField::PacketField(std::string name, ParseLocation loc) : loc_(loc), name_(name) {} |
| |
| std::string PacketField::GetDebugName() const { |
| return "Field{Type:" + GetFieldType() + ", Name:" + GetName() + "}"; |
| } |
| |
| ParseLocation PacketField::GetLocation() const { |
| return loc_; |
| } |
| |
| std::string PacketField::GetName() const { |
| return name_; |
| } |
| |
| Size PacketField::GetBuilderSize() const { |
| return GetSize(); |
| } |
| |
| Size PacketField::GetStructSize() const { |
| return GetSize(); |
| } |
| |
| int PacketField::GenBounds(std::ostream& s, Size start_offset, Size end_offset, Size size) const { |
| // In order to find field_begin and field_end, we must have two of the three Sizes. |
| if ((start_offset.empty() && size.empty()) || (start_offset.empty() && end_offset.empty()) || |
| (end_offset.empty() && size.empty())) { |
| ERROR(this) << "GenBounds called without enough information. " << start_offset << end_offset << size; |
| } |
| |
| if (start_offset.bits() % 8 != 0 || end_offset.bits() % 8 != 0) { |
| ERROR(this) << "Can not find the bounds of a field at a non byte-aligned offset." << start_offset << end_offset; |
| } |
| |
| if (!start_offset.empty()) { |
| s << "size_t field_begin = (" << start_offset << ") / 8;"; |
| } else { |
| s << "size_t field_begin = end_index - (" << end_offset << " + " << size << ") / 8;"; |
| } |
| |
| if (!end_offset.empty()) { |
| s << "size_t field_end = end_index - (" << end_offset << ") / 8;"; |
| // If the field has a known size, use the minimum for the end |
| if (!size.empty()) { |
| s << "size_t field_sized_end = field_begin + (" << size << ") / 8;"; |
| s << "if (field_sized_end < field_end) { field_end = field_sized_end; }"; |
| } |
| } else { |
| s << "size_t field_end = field_begin + (" << size << ") / 8;"; |
| s << "if (field_end > end_index) { field_end = end_index; }"; |
| } |
| s << "auto " << name_ << "_it = to_bound.Subrange(field_begin, field_end - field_begin); "; |
| return 0; // num_leading_bits |
| } |
| |
| bool PacketField::GenBuilderParameter(std::ostream& s) const { |
| auto param_type = GetBuilderParameterType(); |
| if (param_type.empty()) { |
| return false; |
| } |
| s << param_type << " " << GetName(); |
| return true; |
| } |
| |
| bool PacketField::BuilderParameterMustBeMoved() const { |
| return false; |
| } |
| |
| bool PacketField::GenBuilderMember(std::ostream& s) const { |
| return GenBuilderParameter(s); |
| } |
| |
| void PacketField::GenBuilderParameterFromView(std::ostream& s) const { |
| s << "view.Get" << util::UnderscoreToCamelCase(GetName()) << "()"; |
| } |
| |
| bool PacketField::IsContainerField() const { |
| return false; |
| } |
| |
| const PacketField* PacketField::GetElementField() const { |
| return nullptr; |
| } |