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-rw-r--r--qemu/ui/vnc-enc-zlib.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/qemu/ui/vnc-enc-zlib.c b/qemu/ui/vnc-enc-zlib.c
new file mode 100644
index 000000000..d1b97f251
--- /dev/null
+++ b/qemu/ui/vnc-enc-zlib.c
@@ -0,0 +1,152 @@
+/*
+ * QEMU VNC display driver: zlib encoding
+ *
+ * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
+ * Copyright (C) 2006 Fabrice Bellard
+ * Copyright (C) 2009 Red Hat, Inc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "vnc.h"
+
+#define ZALLOC_ALIGNMENT 16
+
+void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size)
+{
+ void *p;
+
+ size *= items;
+ size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
+
+ p = g_malloc0(size);
+
+ return (p);
+}
+
+void vnc_zlib_zfree(void *x, void *addr)
+{
+ g_free(addr);
+}
+
+static void vnc_zlib_start(VncState *vs)
+{
+ buffer_reset(&vs->zlib.zlib);
+
+ // make the output buffer be the zlib buffer, so we can compress it later
+ vs->zlib.tmp = vs->output;
+ vs->output = vs->zlib.zlib;
+}
+
+static int vnc_zlib_stop(VncState *vs)
+{
+ z_streamp zstream = &vs->zlib.stream;
+ int previous_out;
+
+ // switch back to normal output/zlib buffers
+ vs->zlib.zlib = vs->output;
+ vs->output = vs->zlib.tmp;
+
+ // compress the zlib buffer
+
+ // initialize the stream
+ // XXX need one stream per session
+ if (zstream->opaque != vs) {
+ int err;
+
+ VNC_DEBUG("VNC: initializing zlib stream\n");
+ VNC_DEBUG("VNC: opaque = %p | vs = %p\n", zstream->opaque, vs);
+ zstream->zalloc = vnc_zlib_zalloc;
+ zstream->zfree = vnc_zlib_zfree;
+
+ err = deflateInit2(zstream, vs->tight.compression, Z_DEFLATED, MAX_WBITS,
+ MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+
+ if (err != Z_OK) {
+ fprintf(stderr, "VNC: error initializing zlib\n");
+ return -1;
+ }
+
+ vs->zlib.level = vs->tight.compression;
+ zstream->opaque = vs;
+ }
+
+ if (vs->tight.compression != vs->zlib.level) {
+ if (deflateParams(zstream, vs->tight.compression,
+ Z_DEFAULT_STRATEGY) != Z_OK) {
+ return -1;
+ }
+ vs->zlib.level = vs->tight.compression;
+ }
+
+ // reserve memory in output buffer
+ buffer_reserve(&vs->output, vs->zlib.zlib.offset + 64);
+
+ // set pointers
+ zstream->next_in = vs->zlib.zlib.buffer;
+ zstream->avail_in = vs->zlib.zlib.offset;
+ zstream->next_out = vs->output.buffer + vs->output.offset;
+ zstream->avail_out = vs->output.capacity - vs->output.offset;
+ previous_out = zstream->avail_out;
+ zstream->data_type = Z_BINARY;
+
+ // start encoding
+ if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
+ fprintf(stderr, "VNC: error during zlib compression\n");
+ return -1;
+ }
+
+ vs->output.offset = vs->output.capacity - zstream->avail_out;
+ return previous_out - zstream->avail_out;
+}
+
+int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
+{
+ int old_offset, new_offset, bytes_written;
+
+ vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_ZLIB);
+
+ // remember where we put in the follow-up size
+ old_offset = vs->output.offset;
+ vnc_write_s32(vs, 0);
+
+ // compress the stream
+ vnc_zlib_start(vs);
+ vnc_raw_send_framebuffer_update(vs, x, y, w, h);
+ bytes_written = vnc_zlib_stop(vs);
+
+ if (bytes_written == -1)
+ return 0;
+
+ // hack in the size
+ new_offset = vs->output.offset;
+ vs->output.offset = old_offset;
+ vnc_write_u32(vs, bytes_written);
+ vs->output.offset = new_offset;
+
+ return 1;
+}
+
+void vnc_zlib_clear(VncState *vs)
+{
+ if (vs->zlib.stream.opaque) {
+ deflateEnd(&vs->zlib.stream);
+ }
+ buffer_free(&vs->zlib.zlib);
+}