Merge remote-tracking branch 'origin/master'

1 files changed, 32 insertions, 0 deletions

diff --git a/scripts/automation/trex_control_plane/stl/trex_stl_lib/utils/zipmsg.py b/scripts/automation/trex_control_plane/stl/trex_stl_lib/utils/zipmsg.py
new file mode 100644
index 00000000..397ada16
--- /dev/null
+++ b/scripts/automation/trex_control_plane/stl/trex_stl_lib/utils/zipmsg.py
@@ -0,0 +1,32 @@
+import zlib
+import struct
+
+class ZippedMsg:
+
+    MSG_COMPRESS_THRESHOLD    = 256
+    MSG_COMPRESS_HEADER_MAGIC = 0xABE85CEA
+
+    def check_threshold (self, msg):
+        return len(msg) >= self.MSG_COMPRESS_THRESHOLD
+
+    def compress (self, msg):
+        # compress
+        compressed = zlib.compress(msg)
+        new_msg = struct.pack(">II", self.MSG_COMPRESS_HEADER_MAGIC, len(msg)) + compressed
+        return new_msg
+
+
+    def decompress (self, msg):
+        if len(msg) < 8:
+            return None
+
+        t = struct.unpack(">II", msg[:8])
+        if (t[0] != self.MSG_COMPRESS_HEADER_MAGIC):
+            return None
+
+        x = zlib.decompress(msg[8:])
+        if len(x) != t[1]:
+            return None
+
+        return x
+