1 files changed, 62 insertions, 0 deletions
diff --git a/adb/shell_service_protocol.cpp b/adb/shell_service_protocol.cpp
new file mode 100644
index 000000000..623629c75
--- /dev/null
+++ b/adb/shell_service_protocol.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2015 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 "shell_service.h"
+
+#include <string.h>
+
+#include <algorithm>
+
+#include "adb_io.h"
+
+ShellProtocol::ShellProtocol(int fd) : fd_(fd) {
+    buffer_[0] = kIdInvalid;
+}
+
+ShellProtocol::~ShellProtocol() {
+}
+
+bool ShellProtocol::Read() {
+    // Only read a new header if we've finished the last packet.
+    if (!bytes_left_) {
+        if (!ReadFdExactly(fd_, buffer_, kHeaderSize)) {
+            return false;
+        }
+
+        length_t packet_length;
+        memcpy(&packet_length, &buffer_[1], sizeof(packet_length));
+        bytes_left_ = packet_length;
+        data_length_ = 0;
+    }
+
+    size_t read_length = std::min(bytes_left_, data_capacity());
+    if (read_length && !ReadFdExactly(fd_, data(), read_length)) {
+        return false;
+    }
+
+    bytes_left_ -= read_length;
+    data_length_ = read_length;
+
+    return true;
+}
+
+bool ShellProtocol::Write(Id id, size_t length) {
+    buffer_[0] = id;
+    length_t typed_length = length;
+    memcpy(&buffer_[1], &typed_length, sizeof(typed_length));
+
+    return WriteFdExactly(fd_, buffer_, kHeaderSize + length);
+}