[Spice-devel] [spice-common PATCH v4] Add LZ4 data compression and used it in spicevmc channel

[Snir Sheriber]

Compressed message type is CompressedData which contains compression
type (1 byte) followed by the uncompressed data size (4 bytes) followed
by the compressed data size (4 bytes) followed by the compressed data
---
 common/client_marshallers.h |  1 +
 common/messages.h           |  7 +++++++
 spice.proto                 | 15 +++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/common/client_marshallers.h b/common/client_marshallers.h
index 728987e..2074323 100644
--- a/common/client_marshallers.h
+++ b/common/client_marshallers.h
@@ -33,6 +33,7 @@ SPICE_BEGIN_DECLS
 typedef struct {
     void (*msg_SpiceMsgEmpty)(SpiceMarshaller *m, SpiceMsgEmpty *msg);
     void (*msg_SpiceMsgData)(SpiceMarshaller *m, SpiceMsgData *msg);
+    void (*msg_SpiceMsgCompressedData)(SpiceMarshaller *m, SpiceMsgCompressedData *msg);
     void (*msgc_ack_sync)(SpiceMarshaller *m, SpiceMsgcAckSync *msg);
     void (*msgc_pong)(SpiceMarshaller *m, SpiceMsgPing *msg);
     void (*msgc_disconnecting)(SpiceMarshaller *m, SpiceMsgDisconnect *msg);
diff --git a/common/messages.h b/common/messages.h
index f537950..d001850 100644
--- a/common/messages.h
+++ b/common/messages.h
@@ -55,6 +55,13 @@ typedef struct SpiceMsgData {
     uint8_t data[0];
 } SpiceMsgData;
 
+typedef struct SpiceMsgCompressedData {
+    uint8_t type;
+    uint32_t uncompressed_size;
+    uint32_t compressed_size;
+    uint8_t compressed_data[0];
+} SpiceMsgCompressedData;
+
 typedef struct SpiceMsgEmpty {
     uint8_t padding;
 } SpiceMsgEmpty;
diff --git a/spice.proto b/spice.proto
index 4a0778d..ea29fb0 100644
--- a/spice.proto
+++ b/spice.proto
@@ -120,6 +120,19 @@ message Data {
     uint8 data[] @end @ctype(uint8_t);
 } @nocopy;
 
+enum8 data_compression_type {
+    NONE,
+    LZ4,
+    INVALID,
+};
+
+message CompressedData {
+    data_compression_type type;
+    uint32 uncompressed_size;
+    uint32 compressed_size;
+    uint8 compressed_data[] @end;
+} @ctype(SpiceMsgCompressedData);
+
 struct ChannelWait {
     uint8 channel_type;
     uint8 channel_id;
@@ -1373,8 +1386,10 @@ channel SmartcardChannel : BaseChannel {
 channel SpicevmcChannel : BaseChannel {
 server:
     Data data = 101;
+    CompressedData compressed_data = 102;
 client:
     Data data = 101;
+    CompressedData compressed_data = 102;
 };
 
 channel UsbredirChannel : SpicevmcChannel {
-- 
2.5.5