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2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
20 package org
.apache
.thrift
.protocol
;
23 * Class for encoding and decoding Base64 data.
25 * This class is kept at package level because the interface does no input
26 * validation and is therefore too low-level for generalized reuse.
28 * Note also that the encoding does not pad with equal signs , as discussed in
29 * section 2.2 of the RFC (http://www.faqs.org/rfcs/rfc3548.html). Furthermore,
30 * bad data encountered when decoding is neither rejected or ignored but simply
31 * results in bad decoded data -- this is not in compliance with the RFC but is
32 * done in the interest of performance.
37 private static final String ENCODE_TABLE
=
38 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
41 * Encode len bytes of data in src at offset srcOff, storing the result into
42 * dst at offset dstOff. len must be 1, 2, or 3. dst must have at least len+1
43 * bytes of space at dstOff. src and dst should not be the same object. This
44 * method does no validation of the input values in the interest of
47 * @param src the source of bytes to encode
48 * @param srcOff the offset into the source to read the unencoded bytes
49 * @param len the number of bytes to encode (must be 1, 2, or 3).
50 * @param dst the destination for the encoding
51 * @param dstOff the offset into the destination to place the encoded bytes
53 static final void encode(byte[] src
, int srcOff
, int len
, byte[] dst
,
55 dst
[dstOff
] = (byte)ENCODE_TABLE
.charAt((src
[srcOff
] >> 2) & 0x3F);
58 (byte)ENCODE_TABLE
.charAt(
59 ((src
[srcOff
] << 4) & 0x30) | ((src
[srcOff
+1] >> 4) & 0x0F));
61 (byte)ENCODE_TABLE
.charAt(
62 ((src
[srcOff
+1] << 2) & 0x3C) | ((src
[srcOff
+2] >> 6) & 0x03));
64 (byte)ENCODE_TABLE
.charAt(src
[srcOff
+2] & 0x3F);
68 (byte)ENCODE_TABLE
.charAt(
69 ((src
[srcOff
] << 4) & 0x30) | ((src
[srcOff
+1] >> 4) & 0x0F));
71 (byte)ENCODE_TABLE
.charAt((src
[srcOff
+1] << 2) & 0x3C);
75 (byte)ENCODE_TABLE
.charAt((src
[srcOff
] << 4) & 0x30);
79 private static final byte[] DECODE_TABLE
= {
80 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
81 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
82 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
83 52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,
84 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
85 15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
86 -1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
87 41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1,
88 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
89 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
90 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
91 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
92 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
93 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
94 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
95 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
99 * Decode len bytes of data in src at offset srcOff, storing the result into
100 * dst at offset dstOff. len must be 2, 3, or 4. dst must have at least len-1
101 * bytes of space at dstOff. src and dst may be the same object as long as
102 * dstoff <= srcOff. This method does no validation of the input values in
103 * the interest of performance.
105 * @param src the source of bytes to decode
106 * @param srcOff the offset into the source to read the encoded bytes
107 * @param len the number of bytes to decode (must be 2, 3, or 4)
108 * @param dst the destination for the decoding
109 * @param dstOff the offset into the destination to place the decoded bytes
111 static final void decode(byte[] src
, int srcOff
, int len
, byte[] dst
,
114 ((DECODE_TABLE
[src
[srcOff
] & 0x0FF] << 2) |
115 (DECODE_TABLE
[src
[srcOff
+1] & 0x0FF] >> 4));
117 dst
[dstOff
+1] = (byte)
118 (((DECODE_TABLE
[src
[srcOff
+1] & 0x0FF] << 4) & 0xF0) |
119 (DECODE_TABLE
[src
[srcOff
+2] & 0x0FF] >> 2));
121 dst
[dstOff
+2] = (byte)
122 (((DECODE_TABLE
[src
[srcOff
+2] & 0x0FF] << 6) & 0xC0) |
123 DECODE_TABLE
[src
[srcOff
+3] & 0x0FF]);