Fix this

src/lib/base64.c

@@ -1,10 +1,13 @@
 #include <math.h>
 #include <openssl/bio.h>
+#include <openssl/buffer.h>
 #include <openssl/evp.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 // This code is taken from https://gist.github.com/barrysteyn/4409525
+// Modified for Windows compatibility (no fmemopen)
 
 int calcDecodeLength(const char *b64input) {
   int len = strlen(b64input);
@@ -18,40 +21,43 @@ int calcDecodeLength(const char *b64input) {
   return (int)len * 0.75 - padding;
 }
 
-int *base64_encode(const char *message, char **buffer) {
+int base64_encode(const char *message, char **buffer) {
   BIO *bio, *b64;
-  FILE *stream;
-  int encodedSize = 4 * ceil((double)strlen(message) / 3);
-  *buffer = (char *)malloc(encodedSize + 1);
+  BUF_MEM *buffer_ptr;
+  int encodedSize = 4 * (int)ceil((double)strlen(message) / 3);
 
-  stream = fmemopen(*buffer, encodedSize + 1, "w");
   b64 = BIO_new(BIO_f_base64());
-  bio = BIO_new_fp(stream, BIO_NOCLOSE);
+  bio = BIO_new(BIO_s_mem());
   bio = BIO_push(b64, bio);
   BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
   BIO_write(bio, message, strlen(message));
   BIO_flush(bio);
-  BIO_free_all(bio);
-  fclose(stream);
+  BIO_get_mem_ptr(bio, &buffer_ptr);
 
-  return (0);
+  *buffer = (char *)malloc(buffer_ptr->length + 1);
+  memcpy(*buffer, buffer_ptr->data, buffer_ptr->length);
+  (*buffer)[buffer_ptr->length] = '\0';
+
+  BIO_free_all(bio);
+
+  return 0;
 }
 
-int *base64_decode(char *b64message, char **buffer) {
+int base64_decode(char *b64message, char **buffer) {
   BIO *bio, *b64;
-  int decodeLen = calcDecodeLength(b64message), len = 0;
-  *buffer = (char *)malloc(decodeLen + 1);
-  FILE *stream = fmemopen(b64message, strlen(b64message), "r");
+  int decodeLen = calcDecodeLength(b64message);
+  int len = 0;
 
+  *buffer = (char *)malloc(decodeLen + 1);
+
+  bio = BIO_new_mem_buf(b64message, strlen(b64message));
   b64 = BIO_new(BIO_f_base64());
-  bio = BIO_new_fp(stream, BIO_NOCLOSE);
   bio = BIO_push(b64, bio);
   BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
   len = BIO_read(bio, *buffer, strlen(b64message));
   (*buffer)[len] = '\0';
 
   BIO_free_all(bio);
-  fclose(stream);
 
-  return (0);
+  return 0;
 }