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341 lines
10 KiB
341 lines
10 KiB
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR) |
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#pragma warning disable |
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using System; |
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using System.IO; |
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.Encoders |
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{ |
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public class Base64Encoder |
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: IEncoder |
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{ |
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protected readonly byte[] encodingTable = |
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{ |
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(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G', |
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(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N', |
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(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U', |
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(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z', |
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(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g', |
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(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n', |
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(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u', |
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(byte)'v', |
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(byte)'w', (byte)'x', (byte)'y', (byte)'z', |
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(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', |
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(byte)'7', (byte)'8', (byte)'9', |
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(byte)'+', (byte)'/' |
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}; |
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protected byte padding = (byte)'='; |
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/* |
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* set up the decoding table. |
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*/ |
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protected readonly byte[] decodingTable = new byte[128]; |
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protected void InitialiseDecodingTable() |
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{ |
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Arrays.Fill(decodingTable, (byte)0xff); |
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for (int i = 0; i < encodingTable.Length; i++) |
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{ |
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decodingTable[encodingTable[i]] = (byte)i; |
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} |
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} |
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public Base64Encoder() |
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{ |
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InitialiseDecodingTable(); |
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} |
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public int Encode(byte[] inBuf, int inOff, int inLen, byte[] outBuf, int outOff) |
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{ |
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int inPos = inOff; |
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int inEnd = inOff + inLen - 2; |
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int outPos = outOff; |
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while (inPos < inEnd) |
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{ |
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uint a1 = inBuf[inPos++]; |
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uint a2 = inBuf[inPos++]; |
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uint a3 = inBuf[inPos++]; |
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outBuf[outPos++] = encodingTable[(a1 >> 2) & 0x3F]; |
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outBuf[outPos++] = encodingTable[((a1 << 4) | (a2 >> 4)) & 0x3F]; |
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outBuf[outPos++] = encodingTable[((a2 << 2) | (a3 >> 6)) & 0x3F]; |
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outBuf[outPos++] = encodingTable[a3 & 0x3F]; |
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} |
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switch (inLen - (inPos - inOff)) |
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{ |
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case 1: |
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{ |
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uint a1 = inBuf[inPos++]; |
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outBuf[outPos++] = encodingTable[(a1 >> 2) & 0x3F]; |
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outBuf[outPos++] = encodingTable[(a1 << 4) & 0x3F]; |
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outBuf[outPos++] = padding; |
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outBuf[outPos++] = padding; |
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break; |
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} |
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case 2: |
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{ |
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uint a1 = inBuf[inPos++]; |
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uint a2 = inBuf[inPos++]; |
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outBuf[outPos++] = encodingTable[(a1 >> 2) & 0x3F]; |
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outBuf[outPos++] = encodingTable[((a1 << 4) | (a2 >> 4)) & 0x3F]; |
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outBuf[outPos++] = encodingTable[(a2 << 2) & 0x3F]; |
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outBuf[outPos++] = padding; |
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break; |
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} |
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} |
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return outPos - outOff; |
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} |
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/** |
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* encode the input data producing a base 64 output stream. |
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* |
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* @return the number of bytes produced. |
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*/ |
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public int Encode(byte[] buf, int off, int len, Stream outStream) |
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{ |
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if (len < 0) |
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return 0; |
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byte[] tmp = new byte[72]; |
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int remaining = len; |
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while (remaining > 0) |
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{ |
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int inLen = System.Math.Min(54, remaining); |
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int outLen = Encode(buf, off, inLen, tmp, 0); |
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outStream.Write(tmp, 0, outLen); |
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off += inLen; |
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remaining -= inLen; |
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} |
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return (len + 2) / 3 * 4; |
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} |
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private bool Ignore(char c) |
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{ |
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return c == '\n' || c =='\r' || c == '\t' || c == ' '; |
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} |
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/** |
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* decode the base 64 encoded byte data writing it to the given output stream, |
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* whitespace characters will be ignored. |
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* |
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* @return the number of bytes produced. |
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*/ |
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public int Decode(byte[] data, int off, int length, Stream outStream) |
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{ |
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byte b1, b2, b3, b4; |
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byte[] outBuffer = new byte[54]; // S/MIME standard |
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int bufOff = 0; |
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int outLen = 0; |
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int end = off + length; |
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while (end > off) |
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{ |
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if (!Ignore((char)data[end - 1])) |
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break; |
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end--; |
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} |
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int i = off; |
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int finish = end - 4; |
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i = NextI(data, i, finish); |
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while (i < finish) |
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{ |
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b1 = decodingTable[data[i++]]; |
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i = NextI(data, i, finish); |
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b2 = decodingTable[data[i++]]; |
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i = NextI(data, i, finish); |
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b3 = decodingTable[data[i++]]; |
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i = NextI(data, i, finish); |
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b4 = decodingTable[data[i++]]; |
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if ((b1 | b2 | b3 | b4) >= 0x80) |
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throw new IOException("invalid characters encountered in base64 data"); |
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outBuffer[bufOff++] = (byte)((b1 << 2) | (b2 >> 4)); |
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outBuffer[bufOff++] = (byte)((b2 << 4) | (b3 >> 2)); |
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outBuffer[bufOff++] = (byte)((b3 << 6) | b4); |
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if (bufOff == outBuffer.Length) |
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{ |
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outStream.Write(outBuffer, 0, bufOff); |
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bufOff = 0; |
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} |
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outLen += 3; |
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i = NextI(data, i, finish); |
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} |
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if (bufOff > 0) |
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{ |
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outStream.Write(outBuffer, 0, bufOff); |
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} |
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int e0 = NextI(data, i, end); |
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int e1 = NextI(data, e0 + 1, end); |
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int e2 = NextI(data, e1 + 1, end); |
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int e3 = NextI(data, e2 + 1, end); |
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outLen += DecodeLastBlock(outStream, (char)data[e0], (char)data[e1], (char)data[e2], (char)data[e3]); |
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return outLen; |
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} |
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private int NextI( |
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byte[] data, |
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int i, |
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int finish) |
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{ |
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while ((i < finish) && Ignore((char)data[i])) |
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{ |
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i++; |
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} |
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return i; |
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} |
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/** |
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* decode the base 64 encoded string data writing it to the given output stream, |
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* whitespace characters will be ignored. |
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* |
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* @return the number of bytes produced. |
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*/ |
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public int DecodeString(string data, Stream outStream) |
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{ |
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// Platform Implementation |
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// byte[] bytes = Convert.FromBase64String(data); |
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// outStream.Write(bytes, 0, bytes.Length); |
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// return bytes.Length; |
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byte b1, b2, b3, b4; |
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int length = 0; |
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int end = data.Length; |
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while (end > 0) |
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{ |
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if (!Ignore(data[end - 1])) |
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break; |
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end--; |
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} |
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int i = 0; |
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int finish = end - 4; |
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i = NextI(data, i, finish); |
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while (i < finish) |
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{ |
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b1 = decodingTable[data[i++]]; |
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i = NextI(data, i, finish); |
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b2 = decodingTable[data[i++]]; |
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i = NextI(data, i, finish); |
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b3 = decodingTable[data[i++]]; |
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i = NextI(data, i, finish); |
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b4 = decodingTable[data[i++]]; |
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if ((b1 | b2 | b3 | b4) >= 0x80) |
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throw new IOException("invalid characters encountered in base64 data"); |
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outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4))); |
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outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2))); |
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outStream.WriteByte((byte)((b3 << 6) | b4)); |
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length += 3; |
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i = NextI(data, i, finish); |
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} |
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length += DecodeLastBlock(outStream, data[end - 4], data[end - 3], data[end - 2], data[end - 1]); |
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return length; |
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} |
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private int DecodeLastBlock( |
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Stream outStream, |
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char c1, |
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char c2, |
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char c3, |
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char c4) |
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{ |
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if (c3 == padding) |
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{ |
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if (c4 != padding) |
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throw new IOException("invalid characters encountered at end of base64 data"); |
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byte b1 = decodingTable[c1]; |
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byte b2 = decodingTable[c2]; |
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if ((b1 | b2) >= 0x80) |
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throw new IOException("invalid characters encountered at end of base64 data"); |
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outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4))); |
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return 1; |
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} |
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if (c4 == padding) |
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{ |
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byte b1 = decodingTable[c1]; |
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byte b2 = decodingTable[c2]; |
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byte b3 = decodingTable[c3]; |
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if ((b1 | b2 | b3) >= 0x80) |
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throw new IOException("invalid characters encountered at end of base64 data"); |
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outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4))); |
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outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2))); |
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return 2; |
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} |
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{ |
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byte b1 = decodingTable[c1]; |
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byte b2 = decodingTable[c2]; |
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byte b3 = decodingTable[c3]; |
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byte b4 = decodingTable[c4]; |
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if ((b1 | b2 | b3 | b4) >= 0x80) |
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throw new IOException("invalid characters encountered at end of base64 data"); |
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outStream.WriteByte((byte)((b1 << 2) | (b2 >> 4))); |
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outStream.WriteByte((byte)((b2 << 4) | (b3 >> 2))); |
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outStream.WriteByte((byte)((b3 << 6) | b4)); |
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return 3; |
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} |
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} |
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private int NextI(string data, int i, int finish) |
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{ |
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while ((i < finish) && Ignore(data[i])) |
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{ |
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i++; |
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} |
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return i; |
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} |
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} |
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} |
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#pragma warning restore |
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#endif
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