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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/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;
}
void PacketField::GenStringRepresentation(std::ostream& s, std::string accessor) const {
s << "\"REPRESENTATION_UNIMPLEMENTED " << GetFieldType() << " " << accessor << "\"";
}
int PacketField::GetRustBitOffset(
std::ostream&, 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;
}
return 0; // num_leading_bits
}
bool PacketField::GenRustNameAndType(std::ostream& s) const {
auto param_type = GetRustDataType();
if (param_type.empty()) {
return false;
}
s << GetName() << ": " << param_type;
return true;
}
void PacketField::GenBoundsCheck(std::ostream& s, Size start_offset, Size, std::string context) const {
Size size = GetSize();
if (size.bits() < 8) {
return;
}
s << "if bytes.len() < " << start_offset.bytes() + size.bytes() << " {";
s << " return Err(Error::InvalidLengthError{";
s << " obj: \"" << context << "\".to_string(),";
s << " field: \"" << GetName() << "\".to_string(),";
s << " wanted: " << start_offset.bytes() + size.bytes() << ",";
s << " got: bytes.len()});";
s << "}";
}
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