Use chunked xattr reading in OS X sys_lgetxattr().

1 files changed, 22 insertions, 1 deletions

diff --git a/lib/sysxattrs.c b/lib/sysxattrs.c
index d55ee0c2..ba1a2905 100644
--- a/lib/sysxattrs.c
+++ b/lib/sysxattrs.c
@@ -24,6 +24,10 @@
 
 #ifdef SUPPORT_XATTRS
 
+#ifdef HAVE_OSX_XATTRS
+#define GETXATTR_FETCH_LIMIT (64*1024*1024)
+#endif
+
 #if defined HAVE_LINUX_XATTRS
 
 ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
@@ -55,7 +59,24 @@ ssize_t sys_llistxattr(const char *path, char *list, size_t size)
 
 ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
 {
-	return getxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
+	ssize_t len = getxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
+
+	/* If we're retrieving data, handle resource forks > 64MB specially */
+	if (value != NULL && len == GETXATTR_FETCH_LIMIT && (size_t)len < size) {
+		/* getxattr will only return 64MB of data at a time, need to call again with a new offset */
+		u_int32_t offset = len;
+		size_t data_retrieved = len;
+		while (data_retrieved < size) {
+			len = getxattr(path, name, value + offset, size - data_retrieved, offset, XATTR_NOFOLLOW);
+			if (len <= 0)
+				break;
+			data_retrieved += len;
+			offset += (u_int32_t)len;
+		}
+		len = data_retrieved;
+	}
+
+	return len;
 }
 
 ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size)