github.com/datastax/go-cassandra-native-protocol@v0.0.0-20220706104457-5e8aad05cf90/crc/crc32_test.go (about)

     1  // Copyright 2021 DataStax
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package crc
    16  
    17  import (
    18  	"testing"
    19  
    20  	"github.com/stretchr/testify/assert"
    21  )
    22  
    23  func TestChecksumIEEE(t *testing.T) {
    24  	tests := []struct {
    25  		name     string
    26  		data     []byte
    27  		expected uint32
    28  	}{
    29  		{
    30  			"zero",
    31  			[]byte{},
    32  			initialChecksum,
    33  		},
    34  		// test cases below are snapshots taken from actual payloads processed by the DataStax Java driver
    35  		{
    36  			"QUERY (SELECT cluster_name FROM system.local)",
    37  			[]byte{
    38  				6, 16, 0, 0, 7, 0, 0, 0, 47, 0, 0, 0, 37, 83, 69, 76, 69, 67, 84, 32, 99, 108, 117, 115, 116, 101, 114,
    39  				95, 110, 97, 109, 101, 32, 70, 82, 79, 77, 32, 115, 121, 115, 116, 101, 109, 46, 108, 111, 99, 97, 108,
    40  				0, 1, 0, 0, 0, 0},
    41  			37932456,
    42  		},
    43  		{
    44  			"QUERY (SELECT * FROM system.local) + QUERY (SELECT * FROM system.peers_v2)",
    45  			[]byte{
    46  				6, 16, 0, 0, 7, 0, 0, 0, 36, 0, 0, 0, 26, 83, 69, 76, 69, 67, 84, 32, 42, 32, 70, 82, 79, 77, 32, 115,
    47  				121, 115, 116, 101, 109, 46, 108, 111, 99, 97, 108, 0, 1, 0, 0, 0, 0, 6, 16, 0, 1, 7, 0, 0, 0, 39, 0,
    48  				0, 0, 29, 83, 69, 76, 69, 67, 84, 32, 42, 32, 70, 82, 79, 77, 32, 115, 121, 115, 116, 101, 109, 46,
    49  				112, 101, 101, 114, 115, 95, 118, 50, 0, 1, 0, 0, 0, 0},
    50  			// Java driver CRC32 for this payload is the (signed) int -642004664;
    51  			// Go's uint32 equivalent is -642004664 & 0xffffffff = 3652962632.
    52  			uint32(int64(-642004664) & int64(0xffffffff)),
    53  		},
    54  	}
    55  	for _, tt := range tests {
    56  		t.Run(tt.name, func(t *testing.T) {
    57  			actual := ChecksumIEEE(tt.data)
    58  			assert.Equal(t, tt.expected, actual)
    59  		})
    60  	}
    61  }