Binder file module
Test: mma
Bug: 302723053
Change-Id: Ie27f8a36ab56069c928079da8a0cf3d8bfb49813
diff --git a/libs/binder/file.cpp b/libs/binder/file.cpp
new file mode 100644
index 0000000..bac667e
--- /dev/null
+++ b/libs/binder/file.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "file.h"
+
+#ifdef BINDER_NO_LIBBASE
+
+#include <stdint.h>
+
+// clang-format off
+
+namespace android::binder {
+
+bool ReadFully(borrowed_fd fd, void* data, size_t byte_count) {
+ uint8_t* p = reinterpret_cast<uint8_t*>(data);
+ size_t remaining = byte_count;
+ while (remaining > 0) {
+ ssize_t n = TEMP_FAILURE_RETRY(read(fd.get(), p, remaining));
+ if (n == 0) { // EOF
+ errno = ENODATA;
+ return false;
+ }
+ if (n == -1) return false;
+ p += n;
+ remaining -= n;
+ }
+ return true;
+}
+
+bool WriteFully(borrowed_fd fd, const void* data, size_t byte_count) {
+ const uint8_t* p = reinterpret_cast<const uint8_t*>(data);
+ size_t remaining = byte_count;
+ while (remaining > 0) {
+ ssize_t n = TEMP_FAILURE_RETRY(write(fd.get(), p, remaining));
+ if (n == -1) return false;
+ p += n;
+ remaining -= n;
+ }
+ return true;
+}
+
+} // namespace android::binder
+
+#endif // BINDER_NO_LIBBASE