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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
using System;
namespace Thrift.Protocol
{
internal static class TBase64Utils
{
internal const string ENCODE_TABLE =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
internal static void encode(byte[] src, int srcOff, int len, byte[] dst,
int dstOff)
{
dst[dstOff] = (byte)ENCODE_TABLE[(src[srcOff] >> 2) & 0x3F];
if (len == 3)
{
dst[dstOff + 1] =
(byte)ENCODE_TABLE[
((src[srcOff] << 4) & 0x30) | ((src[srcOff + 1] >> 4) & 0x0F)];
dst[dstOff + 2] =
(byte)ENCODE_TABLE[
((src[srcOff + 1] << 2) & 0x3C) | ((src[srcOff + 2] >> 6) & 0x03)];
dst[dstOff + 3] =
(byte)ENCODE_TABLE[src[srcOff + 2] & 0x3F];
}
else if (len == 2)
{
dst[dstOff + 1] =
(byte)ENCODE_TABLE[
((src[srcOff] << 4) & 0x30) | ((src[srcOff + 1] >> 4) & 0x0F)];
dst[dstOff + 2] =
(byte)ENCODE_TABLE[(src[srcOff + 1] << 2) & 0x3C];
}
else
{ // len == 1) {
dst[dstOff + 1] =
(byte)ENCODE_TABLE[(src[srcOff] << 4) & 0x30];
}
}
private static int[] DECODE_TABLE = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
};
internal static void decode(byte[] src, int srcOff, int len, byte[] dst,
int dstOff)
{
dst[dstOff] = (byte)
((DECODE_TABLE[src[srcOff] & 0x0FF] << 2) |
(DECODE_TABLE[src[srcOff + 1] & 0x0FF] >> 4));
if (len > 2)
{
dst[dstOff + 1] = (byte)
(((DECODE_TABLE[src[srcOff + 1] & 0x0FF] << 4) & 0xF0) |
(DECODE_TABLE[src[srcOff + 2] & 0x0FF] >> 2));
if (len > 3)
{
dst[dstOff + 2] = (byte)
(((DECODE_TABLE[src[srcOff + 2] & 0x0FF] << 6) & 0xC0) |
DECODE_TABLE[src[srcOff + 3] & 0x0FF]);
}
}
}
}
}
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