[Spice-devel] [PATCH v7 spice-protocol] LZ4 compression is now available at the Spicevmc channel

[Snir Sheriber]

-New message type for compressed messages has been added to the protocol

Compressed message type is CompressedData which contains compression
type (1 byte) followed by the uncompressed data size (4 bytes -exists
only if data was compressed) followed by the compressed data

-SPICE_SPICEVMC_CAP_DATA_COMPRESS_LZ4 capability has been added

When both sides has the capabilty all usb redirected data will be compressed
(only if size > threshold and AF_LOCAL socket is not in use)

To send compressed msg use SpiceMsgCompressedData type with
spice_marshall_SpiceMsgCompressedData and then use add_ref to add the
compressed data

Signed-off-by: Snir Sheriber <ssheribe at redhat.com>
---
 spice/enums.h    | 9 +++++++++
 spice/protocol.h | 4 ++++
 2 files changed, 13 insertions(+)

diff --git a/spice/enums.h b/spice/enums.h
index c6e9840..1d0c2db 100644
--- a/spice/enums.h
+++ b/spice/enums.h
@@ -106,6 +106,13 @@ typedef enum SpiceMouseMode {
     SPICE_MOUSE_MODE_MASK = 0x3
 } SpiceMouseMode;
 
+typedef enum SpiceDataCompressionType {
+    SPICE_DATA_COMPRESSION_TYPE_NONE,
+    SPICE_DATA_COMPRESSION_TYPE_LZ4,
+
+    SPICE_DATA_COMPRESSION_TYPE_ENUM_END
+} SpiceDataCompressionType;
+
 typedef enum SpicePubkeyType {
     SPICE_PUBKEY_TYPE_INVALID,
     SPICE_PUBKEY_TYPE_RSA,
@@ -634,12 +641,14 @@ enum {
 
 enum {
     SPICE_MSG_SPICEVMC_DATA = 101,
+    SPICE_MSG_SPICEVMC_COMPRESSED_DATA,
 
     SPICE_MSG_END_SPICEVMC
 };
 
 enum {
     SPICE_MSGC_SPICEVMC_DATA = 101,
+    SPICE_MSGC_SPICEVMC_COMPRESSED_DATA,
 
     SPICE_MSGC_END_SPICEVMC
 };
diff --git a/spice/protocol.h b/spice/protocol.h
index f4a2259..d742eda 100644
--- a/spice/protocol.h
+++ b/spice/protocol.h
@@ -148,6 +148,10 @@ enum {
 };
 
 enum {
+    SPICE_SPICEVMC_CAP_DATA_COMPRESS_LZ4,
+};
+
+enum {
     SPICE_PORT_EVENT_OPENED,
     SPICE_PORT_EVENT_CLOSED,
     SPICE_PORT_EVENT_BREAK,
-- 
2.5.5