// Simple Base64 code // (c) Copyright 2010 MCQN Ltd. // Released under Apache License, version 2.0 #include "b64.h" /* Simple test program #include void main() { char* in = "amcewen"; char out[22]; b64_encode(in, 15, out, 22); out[21] = '\0'; printf(out); } */ int b64_encode(const unsigned char* aInput, int aInputLen, unsigned char* aOutput, int aOutputLen) { // Work out if we've got enough space to encode the input // Every 6 bits of input becomes a byte of output if (aOutputLen > 2]; aOutput[1] = b64_dictionary[(aInput[0] & 0x3)>4)]; aOutput[2] = b64_dictionary[(aInput[1]&0x0F)>6)]; aOutput[3] = b64_dictionary[aInput[2]&0x3F]; } else if (aInputLen == 2) { aOutput[0] = b64_dictionary[aInput[0] >> 2]; aOutput[1] = b64_dictionary[(aInput[0] & 0x3)>4)]; aOutput[2] = b64_dictionary[(aInput[1]&0x0F)> 2]; aOutput[1] = b64_dictionary[(aInput[0] & 0x3) 0) { // It doesn't fit neatly into a 3-byte chunk, so process what's left b64_encode(&aInput[i*3], aInputLen % 3, &aOutput[i*4], aOutputLen - (i*4)); } } return ((aInputLen+2)/3)*4; }