From 73f8bc754e200c041e17e613a61dfc35db414b66 Mon Sep 17 00:00:00 2001
From: Omar Rizwan <omar.rizwan@gmail.com>
Date: Wed, 27 Feb 2019 22:06:37 -0800
Subject: base64 hack to handle binary files.

add memory fences because why not.
---
 fs/Makefile |  2 +-
 fs/base64   |  1 +
 fs/common.c | 16 +++++++++-------
 fs/tabfs.c  | 14 ++++++++++----
 4 files changed, 21 insertions(+), 12 deletions(-)
 create mode 160000 fs/base64

(limited to 'fs')

diff --git a/fs/Makefile b/fs/Makefile
index d6b822a..a34412c 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -14,7 +14,7 @@ CFLAGS_OSXFUSE += -DFUSE_USE_VERSION=26
 CFLAGS_OSXFUSE += -D_FILE_OFFSET_BITS=64
 CFLAGS_OSXFUSE += -D_DARWIN_USE_64_BIT_INODE
 
-CFLAGS_EXTRA = -Wall -g $(CFLAGS)
+CFLAGS_EXTRA = -Wall -Wno-unused-function -g $(CFLAGS)
 
 LIBS = -losxfuse
 
diff --git a/fs/base64 b/fs/base64
new file mode 160000
index 0000000..6148c69
--- /dev/null
+++ b/fs/base64
@@ -0,0 +1 @@
+Subproject commit 6148c6944469d629a94a1695eb91989030762ffc
diff --git a/fs/common.c b/fs/common.c
index c2bf3dd..d810fb9 100644
--- a/fs/common.c
+++ b/fs/common.c
@@ -1,10 +1,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <sys/types.h>
-
-#include <sys/time.h>
-#include <stdio.h>
-#include <signal.h>
+#include <stdatomic.h>
 
 #include "common.h"
 
@@ -16,11 +13,13 @@ void common_init() {
     if (pipe(ws_to_tabfs)) exit(1);
 }
 
-// FIXME: we probably need memory fences here?? especially on
-// non-x86?? idk
-// see https://stackoverflow.com/questions/35837539/does-the-use-of-an-anonymous-pipe-introduce-a-memory-barrier-for-interthread-com
+// We probably technically need memory fences here? especially on
+// non-x86?? Are these right? idk. See
+// https://stackoverflow.com/questions/35837539/does-the-use-of-an-anonymous-pipe-introduce-a-memory-barrier-for-interthread-com
+// https://preshing.com/20120913/acquire-and-release-semantics/
 
 void common_send_tabfs_to_ws(char *request_data) {
+    atomic_thread_fence(memory_order_release);
     write(tabfs_to_ws[1], &request_data, sizeof(request_data));
 }
 
@@ -51,16 +50,19 @@ char *common_receive_tabfs_to_ws(fd_set_filler_fn_t filler) {
 
     char *request_data;
     read(tabfs_to_ws[0], &request_data, sizeof(request_data));
+    atomic_thread_fence(memory_order_acquire);
 
     return request_data;
 }
 
 void common_send_ws_to_tabfs(char *response_data) {
+    atomic_thread_fence(memory_order_release);
     write(ws_to_tabfs[1], &response_data, sizeof(response_data));
 }
 char *common_receive_ws_to_tabfs() {
     char *response_data;
     read(ws_to_tabfs[0], &response_data, sizeof(response_data));
+    atomic_thread_fence(memory_order_acquire);
 
     return response_data;
 }
diff --git a/fs/tabfs.c b/fs/tabfs.c
index 1fa5476..0447387 100644
--- a/fs/tabfs.c
+++ b/fs/tabfs.c
@@ -8,6 +8,9 @@
 #include "cJSON/cJSON.h"
 #include "cJSON/cJSON.c"
 
+#include "base64/base64.h"
+#include "base64/base64.c"
+
 #include "common.h"
 #include "ws.h"
 
@@ -119,12 +122,15 @@ tabfs_read(const char *path, char *buf, size_t size, off_t offset,
 
         char *resp_buf = cJSON_GetStringValue(resp_buf_item);
         if (!resp_buf) return -EIO;
-
         size_t resp_buf_len = strlen(resp_buf);
-        size = resp_buf_len < size ? resp_buf_len : size;
-
-        memcpy(buf, resp_buf, size);
 
+        cJSON *base64_encoded_item = cJSON_GetObjectItemCaseSensitive(resp, "base64Encoded");
+        if (base64_encoded_item && cJSON_IsTrue(base64_encoded_item)) {
+            size = base64_decode(resp_buf, resp_buf_len, (unsigned char *) buf);
+        } else {
+            size = resp_buf_len < size ? resp_buf_len : size;
+            memcpy(buf, resp_buf, size);
+        }
         ret = size;
     });
 }
-- 
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