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Andrey K. Choi
2025-10-09 09:57:24 +09:00
commit 4d551bd74f
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212
output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Utilities/Encoders/Base64Encoder.cs Normal file
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using System.IO;
namespace Org.BouncyCastle.Utilities.Encoders;
public class Base64Encoder : IEncoder
{
protected readonly byte[] encodingTable = new byte[64]
{
65, 66, 67, 68, 69, 70, 71, 72, 73, 74,
75, 76, 77, 78, 79, 80, 81, 82, 83, 84,
85, 86, 87, 88, 89, 90, 97, 98, 99, 100,
101, 102, 103, 104, 105, 106, 107, 108, 109, 110,
111, 112, 113, 114, 115, 116, 117, 118, 119, 120,
121, 122, 48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 43, 47
};
protected byte padding = 61;
protected readonly byte[] decodingTable = new byte[128];
protected void InitialiseDecodingTable()
{
Arrays.Fill(decodingTable, byte.MaxValue);
for (int i = 0; i < encodingTable.Length; i++)
{
decodingTable[encodingTable[i]] = (byte)i;
}
}
public Base64Encoder()
{
InitialiseDecodingTable();
}
public int Encode(byte[] data, int off, int length, Stream outStream)
{
int num = length % 3;
int num2 = length - num;
for (int i = off; i < off + num2; i += 3)
{
int num3 = data[i] & 0xFF;
int num4 = data[i + 1] & 0xFF;
int num5 = data[i + 2] & 0xFF;
outStream.WriteByte(encodingTable[(num3 >>> 2) & 0x3F]);
outStream.WriteByte(encodingTable[((num3 << 4) | (num4 >>> 4)) & 0x3F]);
outStream.WriteByte(encodingTable[((num4 << 2) | (num5 >>> 6)) & 0x3F]);
outStream.WriteByte(encodingTable[num5 & 0x3F]);
}
switch (num)
{
case 1:
{
int num6 = data[off + num2] & 0xFF;
int num8 = (num6 >> 2) & 0x3F;
int num9 = (num6 << 4) & 0x3F;
outStream.WriteByte(encodingTable[num8]);
outStream.WriteByte(encodingTable[num9]);
outStream.WriteByte(padding);
outStream.WriteByte(padding);
break;
}
case 2:
{
int num6 = data[off + num2] & 0xFF;
int num7 = data[off + num2 + 1] & 0xFF;
int num8 = (num6 >> 2) & 0x3F;
int num9 = ((num6 << 4) | (num7 >> 4)) & 0x3F;
int num10 = (num7 << 2) & 0x3F;
outStream.WriteByte(encodingTable[num8]);
outStream.WriteByte(encodingTable[num9]);
outStream.WriteByte(encodingTable[num10]);
outStream.WriteByte(padding);
break;
}
}
return num2 / 3 * 4 + ((num != 0) ? 4 : 0);
}
private bool ignore(char c)
{
if (c != '\n' && c != '\r' && c != '\t')
{
return c == ' ';
}
return true;
}
public int Decode(byte[] data, int off, int length, Stream outStream)
{
int num = 0;
int num2 = off + length;
while (num2 > off && ignore((char)data[num2 - 1]))
{
num2--;
}
int i = off;
int num3 = num2 - 4;
for (i = nextI(data, i, num3); i < num3; i = nextI(data, i, num3))
{
byte b = decodingTable[data[i++]];
i = nextI(data, i, num3);
byte b2 = decodingTable[data[i++]];
i = nextI(data, i, num3);
byte b3 = decodingTable[data[i++]];
i = nextI(data, i, num3);
byte b4 = decodingTable[data[i++]];
if ((b | b2 | b3 | b4) >= 128)
{
throw new IOException("invalid characters encountered in base64 data");
}
outStream.WriteByte((byte)((b << 2) | (b2 >> 4)));
outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2)));
outStream.WriteByte((byte)((b3 << 6) | b4));
num += 3;
}
return num + decodeLastBlock(outStream, (char)data[num2 - 4], (char)data[num2 - 3], (char)data[num2 - 2], (char)data[num2 - 1]);
}
private int nextI(byte[] data, int i, int finish)
{
while (i < finish && ignore((char)data[i]))
{
i++;
}
return i;
}
public int DecodeString(string data, Stream outStream)
{
int num = 0;
int num2 = data.Length;
while (num2 > 0 && ignore(data[num2 - 1]))
{
num2--;
}
int i = 0;
int num3 = num2 - 4;
for (i = nextI(data, i, num3); i < num3; i = nextI(data, i, num3))
{
byte b = decodingTable[(uint)data[i++]];
i = nextI(data, i, num3);
byte b2 = decodingTable[(uint)data[i++]];
i = nextI(data, i, num3);
byte b3 = decodingTable[(uint)data[i++]];
i = nextI(data, i, num3);
byte b4 = decodingTable[(uint)data[i++]];
if ((b | b2 | b3 | b4) >= 128)
{
throw new IOException("invalid characters encountered in base64 data");
}
outStream.WriteByte((byte)((b << 2) | (b2 >> 4)));
outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2)));
outStream.WriteByte((byte)((b3 << 6) | b4));
num += 3;
}
return num + decodeLastBlock(outStream, data[num2 - 4], data[num2 - 3], data[num2 - 2], data[num2 - 1]);
}
private int decodeLastBlock(Stream outStream, char c1, char c2, char c3, char c4)
{
if (c3 == padding)
{
if (c4 != padding)
{
throw new IOException("invalid characters encountered at end of base64 data");
}
byte b = decodingTable[(uint)c1];
byte b2 = decodingTable[(uint)c2];
if ((b | b2) >= 128)
{
throw new IOException("invalid characters encountered at end of base64 data");
}
outStream.WriteByte((byte)((b << 2) | (b2 >> 4)));
return 1;
}
if (c4 == padding)
{
byte b3 = decodingTable[(uint)c1];
byte b4 = decodingTable[(uint)c2];
byte b5 = decodingTable[(uint)c3];
if ((b3 | b4 | b5) >= 128)
{
throw new IOException("invalid characters encountered at end of base64 data");
}
outStream.WriteByte((byte)((b3 << 2) | (b4 >> 4)));
outStream.WriteByte((byte)((b4 << 4) | (b5 >> 2)));
return 2;
}
byte b6 = decodingTable[(uint)c1];
byte b7 = decodingTable[(uint)c2];
byte b8 = decodingTable[(uint)c3];
byte b9 = decodingTable[(uint)c4];
if ((b6 | b7 | b8 | b9) >= 128)
{
throw new IOException("invalid characters encountered at end of base64 data");
}
outStream.WriteByte((byte)((b6 << 2) | (b7 >> 4)));
outStream.WriteByte((byte)((b7 << 4) | (b8 >> 2)));
outStream.WriteByte((byte)((b8 << 6) | b9));
return 3;
}
private int nextI(string data, int i, int finish)
{
while (i < finish && ignore(data[i]))
{
i++;
}
return i;
}
}