VuoBase64.cc

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#include "VuoBase64.h"
#include <iostream>
 
#ifdef VUO_COMPILER
VuoModuleMetadata({
                      "title" : "VuoBase64"
                 });
#endif
 
static const std::string base64_chars =
             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
             "abcdefghijklmnopqrstuvwxyz"
             "0123456789+/";
 
static inline bool is_base64(unsigned char c) {
  return (isalnum(c) || (c == '+') || (c == '/'));
}
 
char *VuoBase64_encode(long long in_len, char const *bytes_to_encode)
{
  std::string ret;
  int i = 0;
  int j = 0;
  unsigned char char_array_3[3];
  unsigned char char_array_4[4];
 
  while (in_len--) {
    char_array_3[i++] = *(bytes_to_encode++);
    if (i == 3) {
      char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
      char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
      char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
      char_array_4[3] = char_array_3[2] & 0x3f;
 
      for(i = 0; (i <4) ; i++)
        ret += base64_chars[char_array_4[i]];
      i = 0;
    }
  }
 
  if (i)
  {
    for(j = i; j < 3; j++)
      char_array_3[j] = '\0';
 
    char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
    char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
    char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
    char_array_4[3] = char_array_3[2] & 0x3f;
 
    for (j = 0; (j < i + 1); j++)
      ret += base64_chars[char_array_4[j]];
 
    while((i++ < 3))
      ret += '=';
 
  }
 
  return strdup(ret.c_str());
}
 
char *VuoBase64_decode(char const *encoded_string, long long *outputLength)
{
  int in_len = strlen(encoded_string);
  int i = 0;
  int j = 0;
  int in_ = 0;
  unsigned char char_array_4[4], char_array_3[3];
  std::string ret;
 
  while (in_len-- && ( encoded_string[in_] != '=')) {
    if (encoded_string[in_] == '\\' || encoded_string[in_] == '\n')
    {
        in_++;
        continue;
    }
 
    if (!is_base64(encoded_string[in_]))
        break;
 
    char_array_4[i++] = encoded_string[in_]; in_++;
    if (i ==4) {
      for (i = 0; i <4; i++)
        char_array_4[i] = base64_chars.find(char_array_4[i]);
 
      char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
      char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
      char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
 
      for (i = 0; (i < 3); i++)
        ret += char_array_3[i];
      i = 0;
    }
  }
 
  if (i) {
    for (j = i; j <4; j++)
      char_array_4[j] = 0;
 
    for (j = 0; j <4; j++)
      char_array_4[j] = base64_chars.find(char_array_4[j]);
 
    char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
    char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
    char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
 
    for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
  }
 
  *outputLength = ret.length();
  char *data = (char *)malloc(*outputLength);
  memcpy(data, ret.data(), *outputLength);
  return data;
}