⏎
base64_decode_ctx (struct base64_decode_context *ctx,⏎
                   const char *restrict in, size_t inlen,⏎
                   char *restrict out, size_t *outlen)⏎
{⏎
  size_t outleft = *outlen;⏎
  bool ignore_newlines = ctx != NULL;⏎
  bool flush_ctx = false;⏎
  unsigned int ctx_i = 0;⏎
⏎
  if (ignore_newlines)⏎
    {⏎
      ctx_i = ctx->i;⏎
      flush_ctx = inlen == 0;⏎
    }⏎
⏎
⏎
  while (true)⏎
    {⏎
      size_t outleft_save = outleft;⏎
      if (ctx_i == 0 && !flush_ctx)⏎
        {⏎
          while (true)⏎
            {⏎
              /* Save a copy of outleft, in case we need to re-parse this⏎
                 block of four bytes.  */⏎
              outleft_save = outleft;⏎
              if (!decode_4 (in, inlen, &out, &outleft))⏎
                break;⏎
⏎
              in += 4;⏎
              inlen -= 4;⏎
            }⏎
        }⏎
⏎
      if (inlen == 0 && !flush_ctx)⏎
        break;⏎
⏎
      /* Handle the common case of 72-byte wrapped lines.⏎
         This also handles any other multiple-of-4-byte wrapping.  */⏎
      if (inlen && *in == '\n' && ignore_newlines)⏎
        {⏎
          ++in;⏎
          --inlen;⏎
          continue;⏎
        }⏎
⏎
      /* Restore OUT and OUTLEFT.  */⏎
      out -= outleft_save - outleft;⏎
      outleft = outleft_save;⏎
⏎
      {⏎
        char const *in_end = in + inlen;⏎
        char const *non_nl;⏎
⏎
        if (ignore_newlines)⏎
          non_nl = get_4 (ctx, &in, in_end, &inlen);⏎
        else⏎
          non_nl = in;  /* Might have nl in this case. */⏎
⏎
        /* If the input is empty or consists solely of newlines (0 non-newlines),⏎
           then we're done.  Likewise if there are fewer than 4 bytes when not⏎
           flushing context and not treating newlines as garbage.  */⏎
        if (inlen == 0 || (inlen < 4 && !flush_ctx && ignore_newlines))⏎
          {⏎
            inlen = 0;⏎
            break;⏎
          }⏎
        if (!decode_4 (non_nl, inlen, &out, &outleft))⏎
          break;⏎
⏎
        inlen = in_end - in;⏎
      }⏎
    }⏎
⏎
  *outlen -= outleft;⏎
⏎
  return inlen == 0;⏎
}⏎