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// Copyright 2021 The Pigweed Authors
//
// 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
//
// https://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 "pw_hdlc/wire_packet_parser.h"
#include "gtest/gtest.h"
#include "pw_bytes/array.h"
#include "pw_hdlc/internal/protocol.h"
namespace pw::hdlc {
namespace {
constexpr uint8_t kAddress = 0x6a;
constexpr uint8_t kEncodedAddress = (kAddress << 1) | 0x1;
constexpr uint8_t kControl = 0x03;
TEST(WirePacketParser, Parse_ValidPacket) {
WirePacketParser parser;
EXPECT_TRUE(parser.Parse(bytes::Concat(kFlag,
kEncodedAddress,
kControl,
bytes::String("hello"),
0x1231d0a9,
kFlag)));
auto maybe_address = parser.GetDestinationAddress();
EXPECT_TRUE(maybe_address.has_value());
EXPECT_EQ(maybe_address.value(), kAddress);
}
TEST(WirePacketParser, Parse_MultibyteAddress) {
WirePacketParser parser;
EXPECT_TRUE(parser.Parse(bytes::Concat(kFlag,
bytes::String("\xfe\xff"),
kControl,
bytes::String("hello"),
0x6b53b014,
kFlag)));
auto maybe_address = parser.GetDestinationAddress();
EXPECT_TRUE(maybe_address.has_value());
EXPECT_EQ(maybe_address.value(), 0x3fffu);
}
TEST(WirePacketParser, Parse_EscapedAddress) {
WirePacketParser parser;
EXPECT_TRUE(parser.Parse(bytes::Concat(kFlag,
kEscape,
uint8_t{0x7d ^ 0x20},
kControl,
bytes::String("hello"),
0x66754da0,
kFlag)));
auto maybe_address = parser.GetDestinationAddress();
EXPECT_TRUE(maybe_address.has_value());
EXPECT_EQ(maybe_address.value(), 62u);
}
TEST(WirePacketParser, Parse_EscapedPayload) {
WirePacketParser parser;
EXPECT_TRUE(parser.Parse(bytes::Concat(kFlag,
kEncodedAddress,
kControl,
bytes::String("hello"),
kEscapedEscape,
bytes::String("world"),
0x1af88e47,
kFlag)));
auto maybe_address = parser.GetDestinationAddress();
EXPECT_TRUE(maybe_address.has_value());
EXPECT_EQ(maybe_address.value(), kAddress);
}
TEST(WirePacketParser, Parse_EscapedFcs) {
WirePacketParser parser;
EXPECT_TRUE(
parser.Parse(bytes::Concat(kFlag,
kEncodedAddress,
kControl,
uint8_t{'b'},
// FCS: fc 92 7d 7e
bytes::String("\x7d\x5e\x7d\x5d\x92\xfc"),
kFlag)));
auto maybe_address = parser.GetDestinationAddress();
EXPECT_TRUE(maybe_address.has_value());
EXPECT_EQ(maybe_address.value(), kAddress);
}
TEST(WirePacketParser, Parse_MultipleEscapes) {
WirePacketParser parser;
EXPECT_TRUE(parser.Parse(bytes::Concat(kFlag,
kEscapedEscape,
kControl,
kEscapedEscape,
kEscapedFlag,
kEscapedFlag,
0x8ffd8fcd,
kFlag)));
auto maybe_address = parser.GetDestinationAddress();
EXPECT_TRUE(maybe_address.has_value());
EXPECT_EQ(maybe_address.value(), 62u);
}
TEST(WirePacketParser, Parse_BadFcs) {
WirePacketParser parser;
EXPECT_FALSE(parser.Parse(bytes::Concat(kFlag,
kEncodedAddress,
kControl,
bytes::String("hello"),
0x1badda7a,
kFlag)));
}
TEST(WirePacketParser, Parse_DoubleEscape) {
WirePacketParser parser;
EXPECT_FALSE(parser.Parse(bytes::Concat(kFlag,
kEncodedAddress,
kControl,
bytes::String("hello"),
0x01027d7d,
kFlag)));
}
TEST(WirePacketParser, Parse_FlagInFrame) {
WirePacketParser parser;
EXPECT_FALSE(parser.Parse(bytes::Concat(kFlag,
kEncodedAddress,
kControl,
// inclusive-language: ignore
bytes::String("he~lo"),
0xdbae98fe,
kFlag)));
}
TEST(WirePacketParser, Parse_EmptyPacket) {
WirePacketParser parser;
EXPECT_FALSE(parser.Parse({}));
}
} // namespace
} // namespace pw::hdlc