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    copied!<p>Here is the code to base64 encode directly to byte array (tested to be performing +-10% of .Net Implementation, but allocates half the memory):</p> <pre><code> static public void testBase64EncodeToBuffer() { for (int i = 1; i &lt; 200; ++i) { // prep test data byte[] testData = new byte[i]; for (int j = 0; j &lt; i; ++j) testData[j] = (byte)(j ^ i); // test testBase64(testData); } } static void testBase64(byte[] data) { if (!appendBase64(data, 0, data.Length, false).SequenceEqual(System.Text.Encoding.ASCII.GetBytes(Convert.ToBase64String(data)))) throw new Exception("Base 64 encoding failed); } static public byte[] appendBase64(byte[] data , int offset , int size , bool addLineBreaks = false) { byte[] buffer; int bufferPos = 0; int requiredSize = (4 * ((size + 2) / 3)); // size/76*2 for 2 line break characters if (addLineBreaks) requiredSize += requiredSize + (requiredSize / 38); buffer = new byte[requiredSize]; UInt32 octet_a; UInt32 octet_b; UInt32 octet_c; UInt32 triple; int lineCount = 0; int sizeMod = size - (size % 3); // adding all data triplets for (; offset &lt; sizeMod;) { octet_a = data[offset++]; octet_b = data[offset++]; octet_c = data[offset++]; triple = (octet_a &lt;&lt; 0x10) + (octet_b &lt;&lt; 0x08) + octet_c; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 3 * 6) &amp; 0x3F]; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 2 * 6) &amp; 0x3F]; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 1 * 6) &amp; 0x3F]; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 0 * 6) &amp; 0x3F]; if (addLineBreaks) { if (++lineCount == 19) { buffer[bufferPos++] = 13; buffer[bufferPos++] = 10; lineCount = 0; } } } // last bytes if (sizeMod &lt; size) { octet_a = offset &lt; size ? data[offset++] : (UInt32)0; octet_b = offset &lt; size ? data[offset++] : (UInt32)0; octet_c = (UInt32)0; // last character is definitely padded triple = (octet_a &lt;&lt; 0x10) + (octet_b &lt;&lt; 0x08) + octet_c; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 3 * 6) &amp; 0x3F]; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 2 * 6) &amp; 0x3F]; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 1 * 6) &amp; 0x3F]; buffer[bufferPos++] = base64EncodingTable[(triple &gt;&gt; 0 * 6) &amp; 0x3F]; // add padding '=' sizeMod = size % 3; // last character is definitely padded buffer[bufferPos - 1] = (byte)'='; if (sizeMod == 1) buffer[bufferPos - 2] = (byte)'='; } return buffer; } </code></pre>
 

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