protected void _writeBinary( Base64Variant b64variant, byte[] input, int inputPtr, final int inputEnd) throws IOException, JsonGenerationException { // Encoding is by chunks of 3 input, 4 output chars, so: int safeInputEnd = inputEnd - 3; // Let's also reserve room for possible (and quoted) lf char each round int safeOutputEnd = _outputEnd - 6; int chunksBeforeLF = b64variant.getMaxLineLength() >> 2; // Ok, first we loop through all full triplets of data: while (inputPtr <= safeInputEnd) { if (_outputTail > safeOutputEnd) { // need to flush _flushBuffer(); } // First, mash 3 bytes into lsb of 32-bit int int b24 = ((int) input[inputPtr++]) << 8; b24 |= ((int) input[inputPtr++]) & 0xFF; b24 = (b24 << 8) | (((int) input[inputPtr++]) & 0xFF); _outputTail = b64variant.encodeBase64Chunk(b24, _outputBuffer, _outputTail); if (--chunksBeforeLF <= 0) { // note: must quote in JSON value _outputBuffer[_outputTail++] = '\\'; _outputBuffer[_outputTail++] = 'n'; chunksBeforeLF = b64variant.getMaxLineLength() >> 2; } } // And then we may have 1 or 2 leftover bytes to encode int inputLeft = inputEnd - inputPtr; // 0, 1 or 2 if (inputLeft > 0) { // yes, but do we have room for output? if (_outputTail > safeOutputEnd) { // don't really need 6 bytes but... _flushBuffer(); } int b24 = ((int) input[inputPtr++]) << 16; if (inputLeft == 2) { b24 |= (((int) input[inputPtr++]) & 0xFF) << 8; } _outputTail = b64variant.encodeBase64Partial(b24, inputLeft, _outputBuffer, _outputTail); } }