mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 12:11:13 +00:00
rfbsrc: Check for read/write error
Check for read/write error. This prevent undefined behaviour that rely on unitialized buffer.
This commit is contained in:
Nicolas Dufresne
parent
ba93b86011
commit
0eb5722af6
1 changed files with 125 additions and 50 deletions
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@ -35,16 +35,16 @@ static gboolean rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder *
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decoder);
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static gboolean rfb_decoder_state_set_colour_map_entries (RfbDecoder * decoder);
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static gboolean rfb_decoder_state_server_cut_text (RfbDecoder * decoder);
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static void rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x,
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static gboolean rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x,
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gint start_y, gint rect_w, gint rect_h);
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static void rfb_decoder_copyrect_encoding (RfbDecoder * decoder, gint start_x,
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static gboolean rfb_decoder_copyrect_encoding (RfbDecoder * decoder,
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gint start_x, gint start_y, gint rect_w, gint rect_h);
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static gboolean rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x,
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gint start_y, gint rect_w, gint rect_h);
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static void rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x,
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gint start_y, gint rect_w, gint rect_h);
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static void rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x,
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gint start_y, gint rect_w, gint rect_h);
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static void rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x,
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static gboolean rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x,
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gint start_y, gint rect_w, gint rect_h);
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static gboolean rfb_decoder_hextile_encoding (RfbDecoder * decoder,
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gint start_x, gint start_y, gint rect_w, gint rect_h);
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RfbDecoder *
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rfb_decoder_new (void)
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@ -189,7 +189,9 @@ rfb_decoder_read (RfbDecoder * decoder, guint32 len)
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GInputStream *in;
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GError *err = NULL;
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g_return_val_if_fail (decoder->connection != NULL, NULL);
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if (!decoder->connection)
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return FALSE;
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g_return_val_if_fail (len > 0, NULL);
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in = g_io_stream_get_input_stream (G_IO_STREAM (decoder->connection));
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@ -230,7 +232,9 @@ rfb_decoder_send (RfbDecoder * decoder, guint8 * buffer, guint len)
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GOutputStream *out;
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GError *err = NULL;
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g_return_val_if_fail (decoder->connection != NULL, 0);
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if (!decoder->connection)
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return FALSE;
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g_return_val_if_fail (buffer != NULL, 0);
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g_return_val_if_fail (len > 0, 0);
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@ -333,7 +337,8 @@ rfb_decoder_state_wait_for_protocol_version (RfbDecoder * decoder)
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{
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gchar version_str[] = "RFB 003.003\n";
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rfb_decoder_read (decoder, 12);
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if (!rfb_decoder_read (decoder, 12))
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return FALSE;
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g_return_val_if_fail (memcmp (decoder->data, "RFB 003.00", 10) == 0, FALSE);
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g_return_val_if_fail (*(decoder->data + 11) == 0x0a, FALSE);
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@ -365,7 +370,9 @@ rfb_decoder_state_wait_for_protocol_version (RfbDecoder * decoder)
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}
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version_str[10] = '0' + decoder->protocol_minor;
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rfb_decoder_send (decoder, (guint8 *) version_str, 12);
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if (!rfb_decoder_send (decoder, (guint8 *) version_str, 12))
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return FALSE;
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decoder->state = rfb_decoder_state_wait_for_security;
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return TRUE;
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@ -380,10 +387,14 @@ rfb_decoder_state_reason (RfbDecoder * decoder)
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{
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gint reason_length;
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rfb_decoder_read (decoder, 4);
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if (!rfb_decoder_read (decoder, 4))
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return FALSE;
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reason_length = RFB_GET_UINT32 (decoder->data);
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rfb_decoder_read (decoder, reason_length);
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if (!rfb_decoder_read (decoder, reason_length))
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return FALSE;
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GST_WARNING ("Reason by server: %s", decoder->data);
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if (decoder->error == NULL) {
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@ -405,7 +416,8 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
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* above.
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*/
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if (IS_VERSION_3_3 (decoder)) {
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rfb_decoder_read (decoder, 4);
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if (!rfb_decoder_read (decoder, 4))
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return FALSE;
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decoder->security_type = RFB_GET_UINT32 (decoder->data);
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GST_DEBUG ("security = %d", decoder->security_type);
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@ -421,7 +433,8 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
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gint i;
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guint8 *type = NULL;
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rfb_decoder_read (decoder, 1);
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if (!rfb_decoder_read (decoder, 1))
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return FALSE;
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num_type = RFB_GET_UINT8 (decoder->data);
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if (num_type == 0) {
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@ -429,7 +442,9 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
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return TRUE;
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}
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rfb_decoder_read (decoder, num_type);
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if (!rfb_decoder_read (decoder, num_type))
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return FALSE;
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decoder->security_type = SECURITY_FAIL;
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/* For now, simply pick the first support security method */
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@ -453,7 +468,8 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
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}
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GST_DEBUG ("security = %d", decoder->security_type);
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rfb_decoder_send (decoder, type, 1);
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if (!rfb_decoder_send (decoder, type, 1))
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return FALSE;
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}
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switch (decoder->security_type) {
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@ -502,7 +518,8 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
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des (&des_ctx, challenge + 8, challenge + 8);
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/* .. and send back to server */
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rfb_decoder_send (decoder, challenge, 16);
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if (!rfb_decoder_send (decoder, challenge, 16))
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return FALSE;
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GST_DEBUG ("Encrypted challenge sent to server");
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@ -524,7 +541,9 @@ rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
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static gboolean
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rfb_decoder_state_security_result (RfbDecoder * decoder)
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{
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rfb_decoder_read (decoder, 4);
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if (!rfb_decoder_read (decoder, 4))
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return FALSE;
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if (RFB_GET_UINT32 (decoder->data) != 0) {
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GST_WARNING ("Security handshaking failed");
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if (IS_VERSION_3_8 (decoder)) {
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@ -598,7 +617,11 @@ rfb_decoder_state_set_encodings (RfbDecoder * decoder)
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message = rfb_decoder_message_set_encodings (encoder_list);
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rfb_decoder_send (decoder, message, 4 + 4 * g_slist_length (encoder_list));
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if (!rfb_decoder_send (decoder, message,
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4 + 4 * g_slist_length (encoder_list))) {
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g_free (message);
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return FALSE;
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}
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g_free (message);
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@ -614,7 +637,10 @@ rfb_decoder_state_send_client_initialisation (RfbDecoder * decoder)
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guint8 shared_flag;
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shared_flag = decoder->shared_flag;
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rfb_decoder_send (decoder, &shared_flag, 1);
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if (!rfb_decoder_send (decoder, &shared_flag, 1))
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return FALSE;
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GST_DEBUG ("shared_flag is %d", shared_flag);
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decoder->state = rfb_decoder_state_wait_for_server_initialisation;
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@ -626,7 +652,8 @@ rfb_decoder_state_wait_for_server_initialisation (RfbDecoder * decoder)
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{
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guint32 name_length;
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rfb_decoder_read (decoder, 24);
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if (!rfb_decoder_read (decoder, 24))
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return FALSE;
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decoder->width = RFB_GET_UINT16 (decoder->data + 0);
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decoder->height = RFB_GET_UINT16 (decoder->data + 2);
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@ -657,7 +684,8 @@ rfb_decoder_state_wait_for_server_initialisation (RfbDecoder * decoder)
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name_length = RFB_GET_UINT32 (decoder->data + 20);
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rfb_decoder_read (decoder, name_length);
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if (!rfb_decoder_read (decoder, name_length))
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return FALSE;
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decoder->name = g_strndup ((gchar *) (decoder->data), name_length);
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GST_DEBUG ("name = %s", decoder->name);
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@ -714,7 +742,9 @@ rfb_decoder_state_normal (RfbDecoder * decoder)
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GST_DEBUG ("decoder_state_normal");
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rfb_decoder_read (decoder, 1);
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if (!rfb_decoder_read (decoder, 1))
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return FALSE;
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message_type = RFB_GET_UINT8 (decoder->data);
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switch (message_type) {
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@ -743,7 +773,8 @@ static gboolean
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rfb_decoder_state_framebuffer_update (RfbDecoder * decoder)
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{
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rfb_decoder_read (decoder, 3);
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if (!rfb_decoder_read (decoder, 3))
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return FALSE;
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decoder->n_rects = RFB_GET_UINT16 (decoder->data + 1);
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GST_DEBUG ("Number of rectangles : %d", decoder->n_rects);
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@ -758,8 +789,10 @@ rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder * decoder)
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{
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gint x, y, w, h;
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gint encoding;
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gboolean ret = FALSE;
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rfb_decoder_read (decoder, 12);
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if (!rfb_decoder_read (decoder, 12))
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return FALSE;
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x = RFB_GET_UINT16 (decoder->data + 0) - decoder->offset_x;
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y = RFB_GET_UINT16 (decoder->data + 2) - decoder->offset_y;
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@ -780,34 +813,39 @@ rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder * decoder)
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switch (encoding) {
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case ENCODING_TYPE_RAW:
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rfb_decoder_raw_encoding (decoder, x, y, w, h);
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ret = rfb_decoder_raw_encoding (decoder, x, y, w, h);
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break;
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case ENCODING_TYPE_COPYRECT:
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rfb_decoder_copyrect_encoding (decoder, x, y, w, h);
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ret = rfb_decoder_copyrect_encoding (decoder, x, y, w, h);
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break;
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case ENCODING_TYPE_RRE:
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rfb_decoder_rre_encoding (decoder, x, y, w, h);
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ret = rfb_decoder_rre_encoding (decoder, x, y, w, h);
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break;
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case ENCODING_TYPE_CORRE:
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rfb_decoder_corre_encoding (decoder, x, y, w, h);
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ret = rfb_decoder_corre_encoding (decoder, x, y, w, h);
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break;
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case ENCODING_TYPE_HEXTILE:
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rfb_decoder_hextile_encoding (decoder, x, y, w, h);
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ret = rfb_decoder_hextile_encoding (decoder, x, y, w, h);
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break;
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default:
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g_critical ("unimplemented encoding\n");
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break;
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}
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if (!ret)
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return FALSE;
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decoder->n_rects--;
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if (decoder->n_rects == 0) {
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decoder->state = NULL;
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} else {
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decoder->state = rfb_decoder_state_framebuffer_update_rectangle;
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}
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return TRUE;
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}
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static void
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static gboolean
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rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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gint rect_w, gint rect_h)
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{
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@ -817,8 +855,11 @@ rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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raw_line_size = rect_w * decoder->bytespp;
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size = rect_h * raw_line_size;
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GST_DEBUG ("Reading %d bytes (%dx%d)", size, rect_w, rect_h);
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rfb_decoder_read (decoder, size);
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if (!rfb_decoder_read (decoder, size))
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return FALSE;
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frame =
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decoder->frame + (((start_y * decoder->rect_width) +
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@ -830,9 +871,11 @@ rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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p += raw_line_size;
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frame += decoder->line_size;
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}
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return TRUE;
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}
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static void
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static gboolean
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rfb_decoder_copyrect_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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gint rect_w, gint rect_h)
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{
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@ -840,7 +883,8 @@ rfb_decoder_copyrect_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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gint line_width, copyrect_width;
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guint8 *src, *dst;
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rfb_decoder_read (decoder, 4);
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if (!rfb_decoder_read (decoder, 4))
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return FALSE;
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/* don't forget the offset */
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src_x = RFB_GET_UINT16 (decoder->data) - decoder->offset_x;
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@ -861,6 +905,8 @@ rfb_decoder_copyrect_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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src += line_width;
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dst += line_width;
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}
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return TRUE;
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}
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static void
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@ -882,14 +928,16 @@ rfb_decoder_fill_rectangle (RfbDecoder * decoder, gint x, gint y, gint w,
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}
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}
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static void
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static gboolean
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rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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gint rect_w, gint rect_h)
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{
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guint32 number_of_rectangles, color;
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guint16 x, y, w, h;
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rfb_decoder_read (decoder, 4 + decoder->bytespp);
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if (!rfb_decoder_read (decoder, 4 + decoder->bytespp))
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return FALSE;
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number_of_rectangles = RFB_GET_UINT32 (decoder->data);
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color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + 4)));
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@ -900,7 +948,9 @@ rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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while (number_of_rectangles--) {
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rfb_decoder_read (decoder, decoder->bytespp + 8);
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if (!rfb_decoder_read (decoder, decoder->bytespp + 8))
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return FALSE;
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color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
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x = RFB_GET_UINT16 (decoder->data + decoder->bytespp);
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y = RFB_GET_UINT16 (decoder->data + decoder->bytespp + 2);
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@ -910,16 +960,20 @@ rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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/* draw the rectangle in the foreground */
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rfb_decoder_fill_rectangle (decoder, start_x + x, start_y + y, w, h, color);
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}
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return TRUE;
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}
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static void
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static gboolean
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rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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gint rect_w, gint rect_h)
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{
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guint32 number_of_rectangles, color;
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guint8 x, y, w, h;
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rfb_decoder_read (decoder, 4 + decoder->bytespp);
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if (!rfb_decoder_read (decoder, 4 + decoder->bytespp))
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return FALSE;
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number_of_rectangles = RFB_GET_UINT32 (decoder->data);
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color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + 4)));
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g_free (decoder->data);
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@ -931,7 +985,9 @@ rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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while (number_of_rectangles--) {
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rfb_decoder_read (decoder, decoder->bytespp + 4);
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if (!rfb_decoder_read (decoder, decoder->bytespp + 4))
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return FALSE;
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color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
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x = RFB_GET_UINT8 (decoder->data + decoder->bytespp);
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y = RFB_GET_UINT8 (decoder->data + decoder->bytespp + 1);
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@ -943,9 +999,11 @@ rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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g_free (decoder->data);
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}
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return TRUE;
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}
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static void
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static gboolean
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rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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gint rect_w, gint rect_h)
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{
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@ -967,7 +1025,9 @@ rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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for (y = start_y; y < y_max; y += 16) {
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for (x = start_x; x < x_max; x += 16) {
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rfb_decoder_read (decoder, 1);
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if (!rfb_decoder_read (decoder, 1))
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return FALSE;
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subencoding = RFB_GET_UINT8 (decoder->data);
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if (subencoding & SUBENCODING_RAW) {
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@ -977,7 +1037,9 @@ rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
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}
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if (subencoding & SUBENCODING_BACKGROUND) {
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rfb_decoder_read (decoder, decoder->bytespp);
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if (!rfb_decoder_read (decoder, decoder->bytespp))
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return FALSE;
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background = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
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}
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||||
rfb_decoder_fill_rectangle (decoder, x, y,
|
||||
|
|
@ -985,12 +1047,16 @@ rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
|
|||
background);
|
||||
|
||||
if (subencoding & SUBENCODING_FOREGROUND) {
|
||||
rfb_decoder_read (decoder, decoder->bytespp);
|
||||
if (!rfb_decoder_read (decoder, decoder->bytespp))
|
||||
return FALSE;
|
||||
|
||||
foreground = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
|
||||
}
|
||||
|
||||
if (subencoding & SUBENCODING_ANYSUBRECTS) {
|
||||
rfb_decoder_read (decoder, 1);
|
||||
if (!rfb_decoder_read (decoder, 1))
|
||||
return FALSE;
|
||||
|
||||
nr_subrect = RFB_GET_UINT8 (decoder->data);
|
||||
} else {
|
||||
continue;
|
||||
|
|
@ -999,7 +1065,8 @@ rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
|
|||
if (subencoding & SUBENCODING_SUBRECTSCOLORED) {
|
||||
guint offset = 0;
|
||||
|
||||
rfb_decoder_read (decoder, nr_subrect * (2 + decoder->bytespp));
|
||||
if (!rfb_decoder_read (decoder, nr_subrect * (2 + decoder->bytespp)))
|
||||
return FALSE;
|
||||
|
||||
while (nr_subrect--) {
|
||||
foreground =
|
||||
|
|
@ -1013,7 +1080,8 @@ rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
|
|||
} else {
|
||||
guint offset = 0;
|
||||
|
||||
rfb_decoder_read (decoder, 2 * nr_subrect);
|
||||
if (!rfb_decoder_read (decoder, 2 * nr_subrect))
|
||||
return FALSE;
|
||||
|
||||
while (nr_subrect--) {
|
||||
xy = RFB_GET_UINT8 (decoder->data + offset++);
|
||||
|
|
@ -1024,6 +1092,8 @@ rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
|
|
@ -1040,13 +1110,18 @@ rfb_decoder_state_server_cut_text (RfbDecoder * decoder)
|
|||
gint cut_text_length;
|
||||
|
||||
/* 3 bytes padding, 4 bytes cut_text_length */
|
||||
rfb_decoder_read (decoder, 7);
|
||||
if (!rfb_decoder_read (decoder, 7))
|
||||
return FALSE;
|
||||
|
||||
cut_text_length = RFB_GET_UINT32 (decoder->data + 3);
|
||||
|
||||
rfb_decoder_read (decoder, cut_text_length);
|
||||
if (!rfb_decoder_read (decoder, cut_text_length))
|
||||
return FALSE;
|
||||
|
||||
GST_DEBUG ("rfb_decoder_state_server_cut_text: throw away '%s'",
|
||||
decoder->data);
|
||||
|
||||
decoder->state = rfb_decoder_state_normal;
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue