From c9ec91b75fa4cb4f1042e930d14dc43bf680df85 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Fri, 18 Jul 2014 00:52:07 -0700
Subject: [PATCH] Forcibly disable some currently unsupported zip operations

---
 src/util/vfs-zip.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/util/vfs-zip.c b/src/util/vfs-zip.c
index 7467c9f60..2446f8372 100644
--- a/src/util/vfs-zip.c
+++ b/src/util/vfs-zip.c
@@ -247,9 +247,20 @@ struct VDirEntry* _vdzListNext(struct VDir* vd) {
 
 struct VFile* _vdzOpenFile(struct VDir* vd, const char* path, int mode) {
 	UNUSED(mode);
-	// TODO: support truncating, appending and creating
-
+	// TODO: support truncating, appending and creating, and write
 	struct VDirZip* vdz = (struct VDirZip*) vd;
+
+	if ((mode & O_RDWR) == O_RDWR) {
+		// libzip doesn't allow for random access, so read/write is impossible without
+		// reading the entire file first. This approach will be supported eventually.
+		return 0;
+	}
+
+	if (mode & O_WRONLY) {
+		// Write support is not yet implemented.
+		return 0;
+	}
+
 	struct zip_stat s;
 	if (zip_stat(vdz->z, path, 0, &s) < 0) {
 		return 0;