[Spice-devel] [spice-gtk PATCH] Usbredir: enable lz4 compression
Snir Sheriber
ssheribe at redhat.com
Sun Apr 3 15:40:09 UTC 2016
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
If SPICE_SPICEVMC_CAP_DATA_COMPRESS_LZ4 capability is available &&
data_size > COMPRESS_THRESHOLD data will be sent compressed otherwise
data will be sent uncompressed (as well if compression has failed)
---
src/channel-usbredir.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 89 insertions(+), 7 deletions(-)
diff --git a/src/channel-usbredir.c b/src/channel-usbredir.c
index d95a6c5..cd5cebd 100644
--- a/src/channel-usbredir.c
+++ b/src/channel-usbredir.c
@@ -24,6 +24,9 @@
#ifdef USE_USBREDIR
#include <glib/gi18n.h>
#include <usbredirhost.h>
+#ifdef USE_LZ4
+#include <lz4.h>
+#endif
#ifdef USE_POLKIT
#include "usb-acl-helper.h"
#endif
@@ -52,6 +55,7 @@
#ifdef USE_USBREDIR
+#define COMPRESS_THRESHOLD 1000
#define SPICE_USBREDIR_CHANNEL_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE((obj), SPICE_TYPE_USBREDIR_CHANNEL, SpiceUsbredirChannelPrivate))
@@ -195,6 +199,8 @@ static void channel_set_handlers(SpiceChannelClass *klass)
{
static const spice_msg_handler handlers[] = {
[ SPICE_MSG_SPICEVMC_DATA ] = usbredir_handle_msg,
+ [ SPICE_MSG_SPICEVMC_COMPRESSED_DATA ] = usbredir_handle_msg,
+
};
spice_channel_set_handlers(klass, handlers, G_N_ELEMENTS(handlers));
@@ -231,6 +237,9 @@ void spice_usbredir_channel_set_context(SpiceUsbredirChannel *channel,
#if USBREDIR_VERSION >= 0x000701
usbredirhost_set_buffered_output_size_cb(priv->host, usbredir_buffered_output_size_callback);
#endif
+#ifdef USE_LZ4
+ spice_channel_set_capability(channel, SPICE_SPICEVMC_CAP_DATA_COMPRESS_LZ4);
+#endif
}
static gboolean spice_usbredir_channel_open_device(
@@ -544,11 +553,52 @@ static void usbredir_free_write_cb_data(uint8_t *data, void *user_data)
usbredirhost_free_write_buffer(priv->host, data);
}
+#ifdef USE_LZ4
+static void usbredir_free_write_cb_compressed_data(uint8_t *data, void *user_data)
+{
+ SpiceUsbredirChannel *channel = user_data;
+ SpiceUsbredirChannelPrivate *priv = channel->priv;
+
+ usbredirhost_free_write_buffer(priv->host, (uint8_t*)SPICE_CONTAINEROF(data, SpiceMsgCompressedData, compressed_data));
+}
+#endif
+
static int usbredir_write_callback(void *user_data, uint8_t *data, int count)
{
SpiceUsbredirChannel *channel = user_data;
SpiceMsgOut *msg_out;
-
+#ifdef USE_LZ4
+ int bound;
+
+ if(count > COMPRESS_THRESHOLD &&
+ spice_channel_test_capability(SPICE_CHANNEL(channel),
+ SPICE_SPICEVMC_CAP_DATA_COMPRESS_LZ4) &&
+ ((bound = LZ4_compressBound(count)) != 0)) {
+ int compressed_data_count;
+ SpiceMsgCompressedData *compressed_data_msg;
+
+ compressed_data_msg = (SpiceMsgCompressedData*)spice_malloc(sizeof(SpiceMsgCompressedData) + bound);
+ compressed_data_msg->uncompressed_size = count;
+ compressed_data_msg->type = SPICE_DATA_COMPRESSION_TYPE_LZ4;
+ compressed_data_count = LZ4_compress_default((char*)data,
+ (char*)compressed_data_msg->compressed_data, count, bound);
+ if (compressed_data_count > 0) {
+ compressed_data_msg->compressed_size = compressed_data_count;
+ msg_out = spice_msg_out_new(SPICE_CHANNEL(channel),
+ SPICE_MSGC_SPICEVMC_COMPRESSED_DATA);
+ msg_out->marshallers->msg_SpiceMsgCompressedData(msg_out->marshaller, compressed_data_msg);
+ spice_marshaller_add_ref_full(msg_out->marshaller,
+ (uint8_t*)compressed_data_msg->compressed_data,
+ compressed_data_count,
+ usbredir_free_write_cb_compressed_data,
+ channel);
+ spice_msg_out_send(msg_out);
+ return count;
+ } else {/* free & fallback to sending the message uncompressed */
+ free(compressed_data_msg);
+ }
+ }
+#endif
msg_out = spice_msg_out_new(SPICE_CHANNEL(channel),
SPICE_MSGC_SPICEVMC_DATA);
spice_marshaller_add_ref_full(msg_out->marshaller, data, count,
@@ -639,19 +689,51 @@ static void usbredir_handle_msg(SpiceChannel *c, SpiceMsgIn *in)
SpiceUsbredirChannel *channel = SPICE_USBREDIR_CHANNEL(c);
SpiceUsbredirChannelPrivate *priv = channel->priv;
device_error_data data;
- int r, size;
- uint8_t *buf;
+ int r = 0;
g_return_if_fail(priv->host != NULL);
/* No recursion allowed! */
g_return_if_fail(priv->read_buf == NULL);
- buf = spice_msg_in_raw(in, &size);
- priv->read_buf = buf;
- priv->read_buf_size = size;
+ if (spice_msg_in_type(in) == SPICE_MSG_SPICEVMC_COMPRESSED_DATA) {
+ SpiceMsgCompressedData *compressed_data_msg = spice_msg_in_parsed(in);
+ uint32_t decompressed_size = 0;
+ char* decompressed;
+
+ switch(compressed_data_msg->type) {
+#ifdef USE_LZ4
+ case SPICE_DATA_COMPRESSION_TYPE_LZ4:
+ decompressed = (char*)malloc(compressed_data_msg->uncompressed_size);
+ decompressed_size = LZ4_decompress_safe ((char*)compressed_data_msg->compressed_data,
+ decompressed,
+ compressed_data_msg->compressed_size,
+ compressed_data_msg->uncompressed_size);
+ break;
+#endif
+ default:
+ decompressed = NULL;
+ g_warning("Unknown Compression Type");
+ r = usbredirhost_read_parse_error;
+ }
+ if (decompressed_size != compressed_data_msg->uncompressed_size) {
+ g_warning("Decompress Error decompressed_size=%d expected=%d",
+ decompressed_size, compressed_data_msg->uncompressed_size);
+ r = usbredirhost_read_parse_error;
+ } else {
+ priv->read_buf_size = decompressed_size;
+ priv->read_buf = (uint8_t*)decompressed;
+ }
+ } else { /*Regular SPICE_MSG_SPICEVMC_DATA msg*/
+ int size;
+ uint8_t *buf;
+ buf = spice_msg_in_raw(in, &size);
+ priv->read_buf_size = size;
+ priv->read_buf = buf;
+ }
- r = usbredirhost_read_guest_data(priv->host);
+ if (r == 0)
+ r = usbredirhost_read_guest_data(priv->host);
if (r != 0) {
SpiceUsbDevice *spice_device = priv->spice_device;
gchar *desc;
--
2.4.11
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