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Jens Geyeraa0c8b32019-01-28 23:27:45 +01001// Licensed to the Apache Software Foundation(ASF) under one
2// or more contributor license agreements.See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License. You may obtain a copy of the License at
8//
9// http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied. See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18using System;
19
Jens Geyer4115e952023-11-21 23:00:01 +010020#pragma warning disable IDE0079 // net20 - unneeded suppression
21#pragma warning disable IDE0300 // net8 - simplified collection init
22#pragma warning disable IDE0028 // net8 - simplified collection init
23#pragma warning disable CA1510 // net8 - use ThrowIfNull
24#pragma warning disable CA1513 // net8 - use ThrowIfNull
25
Jens Geyeraa0c8b32019-01-28 23:27:45 +010026namespace Thrift.Protocol.Utilities
27{
28 // ReSharper disable once InconsistentNaming
29 internal static class TBase64Utils
30 {
31 //TODO: Constants
32 //TODO: Check for args
33 //TODO: Unitests
34
35 internal const string EncodeTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
36
37 private static readonly int[] DecodeTable =
38 {
39 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
40 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
41 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
42 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
43 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
44 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
45 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
46 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
47 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
48 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
49 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
50 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
51 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
52 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
53 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
54 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
55 };
56
57 internal static void Encode(byte[] src, int srcOff, int len, byte[] dst, int dstOff)
58 {
59 if (src == null)
60 {
61 throw new ArgumentNullException(nameof(src));
62 }
63
64 dst[dstOff] = (byte) EncodeTable[(src[srcOff] >> 2) & 0x3F];
65
66 if (len == 3)
67 {
68 dst[dstOff + 1] = (byte) EncodeTable[((src[srcOff] << 4) & 0x30) | ((src[srcOff + 1] >> 4) & 0x0F)];
69 dst[dstOff + 2] = (byte) EncodeTable[((src[srcOff + 1] << 2) & 0x3C) | ((src[srcOff + 2] >> 6) & 0x03)];
70 dst[dstOff + 3] = (byte) EncodeTable[src[srcOff + 2] & 0x3F];
71 }
72 else if (len == 2)
73 {
74 dst[dstOff + 1] = (byte) EncodeTable[((src[srcOff] << 4) & 0x30) | ((src[srcOff + 1] >> 4) & 0x0F)];
75 dst[dstOff + 2] = (byte) EncodeTable[(src[srcOff + 1] << 2) & 0x3C];
76 }
77 else
78 {
79 // len == 1
80 dst[dstOff + 1] = (byte) EncodeTable[(src[srcOff] << 4) & 0x30];
81 }
82 }
83
84 internal static void Decode(byte[] src, int srcOff, int len, byte[] dst, int dstOff)
85 {
86 if (src == null)
87 {
88 throw new ArgumentNullException(nameof(src));
89 }
90
91 dst[dstOff] = (byte) ((DecodeTable[src[srcOff] & 0x0FF] << 2) | (DecodeTable[src[srcOff + 1] & 0x0FF] >> 4));
92
93 if (len > 2)
94 {
95 dst[dstOff + 1] =
96 (byte)
97 (((DecodeTable[src[srcOff + 1] & 0x0FF] << 4) & 0xF0) | (DecodeTable[src[srcOff + 2] & 0x0FF] >> 2));
98 if (len > 3)
99 {
100 dst[dstOff + 2] =
101 (byte)
102 (((DecodeTable[src[srcOff + 2] & 0x0FF] << 6) & 0xC0) | DecodeTable[src[srcOff + 3] & 0x0FF]);
103 }
104 }
105 }
106 }
Jens Geyer4115e952023-11-21 23:00:01 +0100107}