gstreamer/subprojects/gst-plugins-bad/gst/librfb/rfbdecoder.c

1131 lines
30 KiB
C

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "rfbdecoder.h"
#include "d3des.h"
#include <gst/gst.h>
#include <stdlib.h>
#include <string.h>
#define RFB_GET_UINT32(ptr) GST_READ_UINT32_BE(ptr)
#define RFB_GET_UINT16(ptr) GST_READ_UINT16_BE(ptr)
#define RFB_GET_UINT8(ptr) GST_READ_UINT8(ptr)
#define RFB_SET_UINT32(ptr, val) GST_WRITE_UINT32_BE((ptr),(val))
#define RFB_SET_UINT16(ptr, val) GST_WRITE_UINT16_BE((ptr),(val))
#define RFB_SET_UINT8(ptr, val) GST_WRITE_UINT8((ptr),(val))
GST_DEBUG_CATEGORY_EXTERN (rfbdecoder_debug);
#define GST_CAT_DEFAULT rfbdecoder_debug
static gboolean rfb_decoder_state_wait_for_protocol_version (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_wait_for_security (RfbDecoder * decoder);
static gboolean rfb_decoder_state_send_client_initialisation (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_wait_for_server_initialisation (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_security_result (RfbDecoder * decoder);
static gboolean rfb_decoder_state_normal (RfbDecoder * decoder);
static gboolean rfb_decoder_state_framebuffer_update (RfbDecoder * decoder);
static gboolean rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_set_colour_map_entries (RfbDecoder * decoder);
static gboolean rfb_decoder_state_server_cut_text (RfbDecoder * decoder);
static gboolean rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
static gboolean rfb_decoder_copyrect_encoding (RfbDecoder * decoder,
gint start_x, gint start_y, gint rect_w, gint rect_h);
static gboolean rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
static gboolean rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
static gboolean rfb_decoder_hextile_encoding (RfbDecoder * decoder,
gint start_x, gint start_y, gint rect_w, gint rect_h);
RfbDecoder *
rfb_decoder_new (void)
{
RfbDecoder *decoder = g_new0 (RfbDecoder, 1);
decoder->socket_client = g_socket_client_new ();
decoder->connection = NULL;
decoder->cancellable = g_cancellable_new ();
decoder->password = NULL;
decoder->use_copyrect = FALSE;
decoder->offset_x = 0;
decoder->offset_y = 0;
decoder->rect_width = 0;
decoder->rect_height = 0;
decoder->shared_flag = TRUE;
decoder->data = NULL;
decoder->data_len = 0;
decoder->error = NULL;
g_mutex_init (&decoder->write_lock);
return decoder;
}
void
rfb_decoder_free (RfbDecoder * decoder)
{
g_return_if_fail (decoder != NULL);
rfb_decoder_disconnect (decoder);
g_clear_object (&decoder->socket_client);
g_clear_object (&decoder->cancellable);
g_mutex_clear (&decoder->write_lock);
g_free (decoder);
}
gboolean
rfb_decoder_connect_tcp (RfbDecoder * decoder, gchar * host, guint port)
{
GError *err = NULL;
GSocketConnection *connection;
GST_DEBUG ("connecting to the rfb server");
g_return_val_if_fail (decoder != NULL, FALSE);
g_return_val_if_fail (decoder->connection == NULL, FALSE);
g_return_val_if_fail (host != NULL, FALSE);
g_cancellable_reset (decoder->cancellable);
connection =
g_socket_client_connect_to_host (decoder->socket_client, host, port,
decoder->cancellable, &err);
if (!connection)
goto connect_failed;
decoder->connection = connection;
return TRUE;
connect_failed:
{
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
GST_DEBUG ("Cancelled connecting");
} else {
GST_WARNING ("Failed to connect to host '%s:%d': %s", host, port,
err->message);
if (decoder->error == NULL) {
decoder->error = err;
err = NULL;
}
}
g_clear_error (&err);
return FALSE;
}
}
void
rfb_decoder_disconnect (RfbDecoder * decoder)
{
GST_DEBUG ("Disconnecting from the rfb server");
g_return_if_fail (decoder);
g_return_if_fail (decoder->cancellable);
g_cancellable_cancel (decoder->cancellable);
/* Make sure threaded write a done first, this avoids race condition,
* specially when the decoder is freed */
g_mutex_lock (&decoder->write_lock);
g_clear_object (&decoder->connection);
g_clear_error (&decoder->error);
g_clear_pointer (&decoder->data, g_free);
g_mutex_unlock (&decoder->write_lock);
}
/**
* rfb_decoder_iterate:
* @decoder: The rfb context
*
* Initializes the connection with the rfb server
*
* Returns: TRUE if initialization was successful, FALSE on fail.
*/
gboolean
rfb_decoder_iterate (RfbDecoder * decoder)
{
gboolean ret;
g_return_val_if_fail (decoder != NULL, FALSE);
g_return_val_if_fail (decoder->connection != NULL, FALSE);
if (decoder->state == NULL) {
GST_DEBUG ("First iteration: set state to -> wait for protocol version");
decoder->state = rfb_decoder_state_wait_for_protocol_version;
}
GST_DEBUG ("Executing next state in initialization");
ret = decoder->state (decoder);
if (ret == FALSE) {
if (decoder->error == NULL)
GST_WARNING ("Failure, but no error stored");
else
GST_WARNING ("Failure: %s", decoder->error->message);
}
return ret;
}
static guint8 *
rfb_decoder_read (RfbDecoder * decoder, guint32 len)
{
GInputStream *in;
GError *err = NULL;
gsize count = 0;
if (!decoder->connection)
return FALSE;
g_return_val_if_fail (len > 0, NULL);
in = g_io_stream_get_input_stream (G_IO_STREAM (decoder->connection));
g_return_val_if_fail (in != NULL, NULL);
if (G_UNLIKELY (len > decoder->data_len)) {
g_free (decoder->data);
decoder->data = g_malloc (len);
decoder->data_len = len;
}
if (!g_input_stream_read_all (in, decoder->data, len, &count,
decoder->cancellable, &err))
goto recv_error;
if (count == 0) {
g_set_error_literal (&err, G_IO_ERROR, G_IO_ERROR_BROKEN_PIPE,
"Connection was closed.");
goto recv_error;
}
return decoder->data;
recv_error:
{
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
GST_DEBUG ("Read on socket cancelled");
} else {
GST_ERROR ("Read error on socket: %s", err->message);
if (decoder->error == NULL) {
decoder->error = err;
err = NULL;
}
}
g_clear_error (&err);
return NULL;
}
}
static gboolean
rfb_decoder_send (RfbDecoder * decoder, guint8 * buffer, guint len)
{
GOutputStream *out;
GError *err = NULL;
if (!decoder->connection)
return FALSE;
g_return_val_if_fail (buffer != NULL, 0);
g_return_val_if_fail (len > 0, 0);
g_mutex_lock (&decoder->write_lock);
out = g_io_stream_get_output_stream (G_IO_STREAM (decoder->connection));
if (!g_output_stream_write_all (out, buffer, len, NULL, decoder->cancellable,
&err))
goto send_error;
g_mutex_unlock (&decoder->write_lock);
return TRUE;
send_error:
{
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
GST_DEBUG ("Send on socket cancelled");
} else {
GST_ERROR ("Send error on socket: %s", err->message);
if (decoder->error == NULL) {
decoder->error = err;
err = NULL;
}
}
g_clear_error (&err);
g_mutex_unlock (&decoder->write_lock);
return FALSE;
}
}
void
rfb_decoder_send_update_request (RfbDecoder * decoder,
gboolean incremental, gint x, gint y, gint width, gint height)
{
guint8 data[10];
g_return_if_fail (decoder != NULL);
g_return_if_fail (decoder->connection != NULL);
data[0] = 3;
data[1] = incremental;
RFB_SET_UINT16 (data + 2, x);
RFB_SET_UINT16 (data + 4, y);
RFB_SET_UINT16 (data + 6, width);
RFB_SET_UINT16 (data + 8, height);
rfb_decoder_send (decoder, data, 10);
/* create a backup of the prev frame for copyrect encoding */
if (decoder->use_copyrect) {
memcpy (decoder->prev_frame, decoder->frame,
decoder->rect_width * decoder->rect_height * decoder->bpp / 8);
}
decoder->state = rfb_decoder_state_normal;
}
void
rfb_decoder_send_key_event (RfbDecoder * decoder, guint key, gboolean down_flag)
{
guint8 data[8];
g_return_if_fail (decoder != NULL);
g_return_if_fail (decoder->connection != NULL);
data[0] = 4;
data[1] = down_flag;
RFB_SET_UINT16 (data + 2, 0);
RFB_SET_UINT32 (data + 4, key);
rfb_decoder_send (decoder, data, 8);
}
void
rfb_decoder_send_pointer_event (RfbDecoder * decoder,
gint button_mask, gint x, gint y)
{
guint8 data[6];
g_return_if_fail (decoder != NULL);
g_return_if_fail (decoder->connection != NULL);
data[0] = 5;
data[1] = button_mask;
RFB_SET_UINT16 (data + 2, x);
RFB_SET_UINT16 (data + 4, y);
rfb_decoder_send (decoder, data, 6);
}
/**
* rfb_decoder_state_wait_for_protocol_version:
*
* Negotiate the rfb version used
*/
static gboolean
rfb_decoder_state_wait_for_protocol_version (RfbDecoder * decoder)
{
gchar version_str[] = "RFB 003.003\n";
if (!rfb_decoder_read (decoder, 12))
return FALSE;
g_return_val_if_fail (memcmp (decoder->data, "RFB 003.", 8) == 0, FALSE);
g_return_val_if_fail (*(decoder->data + 11) == 0x0a, FALSE);
GST_DEBUG ("\"%.11s\"", decoder->data);
*(decoder->data) = 0x00;
*(decoder->data + 11) = 0x00;
decoder->protocol_major = atoi ((char *) (decoder->data + 4));
decoder->protocol_minor = atoi ((char *) (decoder->data + 8));
GST_DEBUG ("Major version : %d", decoder->protocol_major);
GST_DEBUG ("Minor version : %d", decoder->protocol_minor);
if (decoder->protocol_major != 3) {
GST_INFO
("A major protocol version of %d is not supported, falling back to 3",
decoder->protocol_major);
decoder->protocol_major = 3;
decoder->protocol_minor = 3;
}
switch (decoder->protocol_minor) {
case 3:
case 7:
case 8:
break;
default:
GST_INFO ("Minor version %d is not supported, using 3",
decoder->protocol_minor);
decoder->protocol_minor = 3;
}
version_str[10] = '0' + decoder->protocol_minor;
if (!rfb_decoder_send (decoder, (guint8 *) version_str, 12))
return FALSE;
decoder->state = rfb_decoder_state_wait_for_security;
return TRUE;
}
/*
* a string describing the reason (where a string is specified as a length
* followed by that many ASCII characters)
**/
static gboolean
rfb_decoder_state_reason (RfbDecoder * decoder)
{
gint reason_length;
if (!rfb_decoder_read (decoder, 4))
return FALSE;
reason_length = RFB_GET_UINT32 (decoder->data);
if (!rfb_decoder_read (decoder, reason_length))
return FALSE;
GST_WARNING ("Reason by server: %s", decoder->data);
if (decoder->error == NULL) {
decoder->error = g_error_new (GST_RESOURCE_ERROR, GST_RESOURCE_ERROR_READ,
"VNC server error: %s", decoder->data);
}
return FALSE;
}
static gboolean
rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
{
/*
* Version 3.3 The server decides the security type and sends a single word
*
* The security-type may only take the value 0, 1 or 2. A value of 0 means that the
* connection has failed and is followed by a string giving the reason, as described
* above.
*/
if (IS_VERSION_3_3 (decoder)) {
if (!rfb_decoder_read (decoder, 4))
return FALSE;
decoder->security_type = RFB_GET_UINT32 (decoder->data);
GST_DEBUG ("security = %d", decoder->security_type);
g_return_val_if_fail (decoder->security_type < 3, FALSE);
if (decoder->security_type == SECURITY_FAIL) {
decoder->state = rfb_decoder_state_reason;
return TRUE;
}
} else {
guint8 num_type;
gint i;
guint8 *type = NULL;
if (!rfb_decoder_read (decoder, 1))
return FALSE;
num_type = RFB_GET_UINT8 (decoder->data);
if (num_type == 0) {
decoder->state = rfb_decoder_state_reason;
return TRUE;
}
if (!rfb_decoder_read (decoder, num_type))
return FALSE;
decoder->security_type = SECURITY_FAIL;
/* For now, simply pick the first support security method */
for (i = 0; i < num_type; i++) {
guint val = RFB_GET_UINT8 (decoder->data + i);
GST_DEBUG ("Server supports security type %u", val);
if (val == SECURITY_NONE || val == SECURITY_VNC) {
decoder->security_type = val;
type = decoder->data + i;
break;
}
}
if (!type) {
GST_WARNING ("Security type negotiation failed.");
decoder->error = g_error_new (GST_RESOURCE_ERROR, GST_RESOURCE_ERROR_READ,
"VNC server requires unsupported security method.");
return FALSE;
}
GST_DEBUG ("security = %d", decoder->security_type);
if (!rfb_decoder_send (decoder, type, 1))
return FALSE;
}
switch (decoder->security_type) {
case SECURITY_NONE:
GST_DEBUG ("Security type is None");
if (IS_VERSION_3_8 (decoder)) {
decoder->state = rfb_decoder_state_security_result;
} else {
decoder->state = rfb_decoder_state_send_client_initialisation;
}
break;
case SECURITY_VNC:{
unsigned char key[8], *challenge;
DESContext des_ctx;
gsize password_len;
/*
* VNC authentication is to be used and protocol data is to be sent
* unencrypted. The server sends a random 16-byte challenge
*/
GST_DEBUG ("Security type is VNC Authentication");
/* VNC Authentication can't be used if the password is not set */
if (!decoder->password) {
GST_WARNING
("VNC Authentication can't be used if the password is not set");
decoder->error =
g_error_new (GST_RESOURCE_ERROR, GST_RESOURCE_ERROR_READ,
"VNC servers needs authentication, but no password set");
return FALSE;
}
/* key is 8 bytes and made up of password (padded with 0s if needed) */
memset (key, 0, 8);
password_len = strlen (decoder->password);
memcpy (key, decoder->password, MIN (password_len, 8));
/* read challenge */
challenge = rfb_decoder_read (decoder, 16);
if (challenge == NULL)
return FALSE;
/* encrypt 16 challenge bytes in place using key */
memset (&des_ctx, 0, sizeof (DESContext));
deskey (&des_ctx, key, EN0);
des (&des_ctx, challenge, challenge);
des (&des_ctx, challenge + 8, challenge + 8);
/* .. and send back to server */
if (!rfb_decoder_send (decoder, challenge, 16))
return FALSE;
GST_DEBUG ("Encrypted challenge sent to server");
decoder->state = rfb_decoder_state_security_result;
break;
}
default:
GST_WARNING ("Security type is not known");
return FALSE;
break;
}
return TRUE;
}
/*
* The server sends a word to inform the client whether the security handshaking was
* successful.
*/
static gboolean
rfb_decoder_state_security_result (RfbDecoder * decoder)
{
if (!rfb_decoder_read (decoder, 4))
return FALSE;
if (RFB_GET_UINT32 (decoder->data) != 0) {
GST_WARNING ("Security handshaking failed");
if (IS_VERSION_3_8 (decoder)) {
decoder->state = rfb_decoder_state_reason;
return TRUE;
}
if (decoder->error == NULL) {
decoder->error = g_error_new (GST_RESOURCE_ERROR, GST_RESOURCE_ERROR_READ,
"authentication failed");
}
return FALSE;
}
GST_DEBUG ("Security handshake successful");
decoder->state = rfb_decoder_state_send_client_initialisation;
return TRUE;
}
static guint8 *
rfb_decoder_message_set_encodings (GSList * encodings_list)
{
guint8 *message = g_malloc0 (4 + 4 * g_slist_length (encodings_list));
guint32 *encoding_type;
message[0] = 0x02; /* message type */
RFB_SET_UINT16 (message + 2, g_slist_length (encodings_list)); /* number of encodings */
/* write all the encoding types */
encoding_type = (guint32 *) (message + 4);
while (encodings_list) {
RFB_SET_UINT32 (encoding_type, GPOINTER_TO_UINT (encodings_list->data));
encoding_type++;
encodings_list = encodings_list->next;
}
return message;
}
/*
* rfb_decoder_state_set_encodings:
* @decoder: The rfb context
*
* Sends the encoding types that the client can decode to the server
*
* Returns: TRUE if initialization was successful, FALSE on fail.
*/
static gboolean
rfb_decoder_state_set_encodings (RfbDecoder * decoder)
{
GSList *encoder_list = NULL;
guint8 *message;
GST_DEBUG ("entered set encodings");
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_HEXTILE));
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_CORRE));
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_RRE));
if (decoder->use_copyrect) {
encoder_list =
g_slist_append (encoder_list,
GUINT_TO_POINTER (ENCODING_TYPE_COPYRECT));
}
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_RAW));
message = rfb_decoder_message_set_encodings (encoder_list);
if (!rfb_decoder_send (decoder, message,
4 + 4 * g_slist_length (encoder_list))) {
g_free (message);
return FALSE;
}
g_free (message);
decoder->state = rfb_decoder_state_normal;
decoder->inited = TRUE;
return TRUE;
}
static gboolean
rfb_decoder_state_send_client_initialisation (RfbDecoder * decoder)
{
guint8 shared_flag;
shared_flag = decoder->shared_flag;
if (!rfb_decoder_send (decoder, &shared_flag, 1))
return FALSE;
GST_DEBUG ("shared_flag is %d", shared_flag);
decoder->state = rfb_decoder_state_wait_for_server_initialisation;
return TRUE;
}
static gboolean
rfb_decoder_state_wait_for_server_initialisation (RfbDecoder * decoder)
{
guint32 name_length;
if (!rfb_decoder_read (decoder, 24))
return FALSE;
decoder->width = RFB_GET_UINT16 (decoder->data + 0);
decoder->height = RFB_GET_UINT16 (decoder->data + 2);
decoder->bpp = RFB_GET_UINT8 (decoder->data + 4);
decoder->depth = RFB_GET_UINT8 (decoder->data + 5);
decoder->big_endian = RFB_GET_UINT8 (decoder->data + 6);
decoder->true_colour = RFB_GET_UINT8 (decoder->data + 7);
decoder->red_max = RFB_GET_UINT16 (decoder->data + 8);
decoder->green_max = RFB_GET_UINT16 (decoder->data + 10);
decoder->blue_max = RFB_GET_UINT16 (decoder->data + 12);
decoder->red_shift = RFB_GET_UINT8 (decoder->data + 14);
decoder->green_shift = RFB_GET_UINT8 (decoder->data + 15);
decoder->blue_shift = RFB_GET_UINT8 (decoder->data + 16);
GST_DEBUG ("Server Initialization");
GST_DEBUG ("width = %d", decoder->width);
GST_DEBUG ("height = %d", decoder->height);
GST_DEBUG ("bpp = %d", decoder->bpp);
GST_DEBUG ("depth = %d", decoder->depth);
GST_DEBUG ("big_endian = %d", decoder->big_endian);
GST_DEBUG ("true_colour= %d", decoder->true_colour);
GST_DEBUG ("red_max = %d", decoder->red_max);
GST_DEBUG ("green_max = %d", decoder->green_max);
GST_DEBUG ("blue_max = %d", decoder->blue_max);
GST_DEBUG ("red_shift = %d", decoder->red_shift);
GST_DEBUG ("green_shift= %d", decoder->green_shift);
GST_DEBUG ("blue_shift = %d", decoder->blue_shift);
name_length = RFB_GET_UINT32 (decoder->data + 20);
if (!rfb_decoder_read (decoder, name_length))
return FALSE;
decoder->name = g_strndup ((gchar *) (decoder->data), name_length);
GST_DEBUG ("name = %s", decoder->name);
/* check if we need cropping */
if (decoder->offset_x > 0) {
if (decoder->offset_x > decoder->width) {
GST_WARNING
("Trying to crop more than the width of the server. Setting offset-x to 0.");
decoder->offset_x = 0;
} else {
decoder->width -= decoder->offset_x;
}
}
if (decoder->offset_y > 0) {
if (decoder->offset_y > decoder->height) {
GST_WARNING
("Trying to crop more than the height of the server. Setting offset-y to 0.");
decoder->offset_y = 0;
} else {
decoder->height -= decoder->offset_y;
}
}
if (decoder->rect_width > 0) {
if (decoder->rect_width > decoder->width) {
GST_WARNING
("Trying to crop more than the width of the server. Setting width to %u.",
decoder->width);
decoder->rect_width = decoder->width;
} else {
decoder->width = decoder->rect_width;
}
}
if (decoder->rect_height > 0) {
if (decoder->rect_height > decoder->height) {
GST_WARNING
("Trying to crop more than the height of the server. Setting height to %u.",
decoder->height);
decoder->rect_height = decoder->height;
} else {
decoder->height = decoder->rect_height;
}
}
decoder->state = rfb_decoder_state_set_encodings;
return TRUE;
}
static gboolean
rfb_decoder_state_normal (RfbDecoder * decoder)
{
gint message_type;
GST_DEBUG ("decoder_state_normal");
if (!rfb_decoder_read (decoder, 1))
return FALSE;
message_type = RFB_GET_UINT8 (decoder->data);
switch (message_type) {
case MESSAGE_TYPE_FRAMEBUFFER_UPDATE:
GST_DEBUG ("Receiving framebuffer update");
decoder->state = rfb_decoder_state_framebuffer_update;
break;
case 1:
decoder->state = rfb_decoder_state_set_colour_map_entries;
break;
case 2:
/* bell, ignored */
decoder->state = rfb_decoder_state_normal;
break;
case 3:
decoder->state = rfb_decoder_state_server_cut_text;
break;
default:
g_critical ("unknown message type %d", message_type);
}
return TRUE;
}
static gboolean
rfb_decoder_state_framebuffer_update (RfbDecoder * decoder)
{
if (!rfb_decoder_read (decoder, 3))
return FALSE;
decoder->n_rects = RFB_GET_UINT16 (decoder->data + 1);
GST_DEBUG ("Number of rectangles : %d", decoder->n_rects);
decoder->state = rfb_decoder_state_framebuffer_update_rectangle;
return TRUE;
}
static gboolean
rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder * decoder)
{
gint x, y, w, h;
gint encoding;
gboolean ret = FALSE;
if (!rfb_decoder_read (decoder, 12))
return FALSE;
x = RFB_GET_UINT16 (decoder->data + 0) - decoder->offset_x;
y = RFB_GET_UINT16 (decoder->data + 2) - decoder->offset_y;
w = RFB_GET_UINT16 (decoder->data + 4);
h = RFB_GET_UINT16 (decoder->data + 6);
encoding = RFB_GET_UINT32 (decoder->data + 8);
GST_DEBUG ("update received");
GST_DEBUG ("x:%d y:%d", x, y);
GST_DEBUG ("w:%d h:%d", w, h);
GST_DEBUG ("encoding: %d", encoding);
if (((w * h) + (x * y)) > (decoder->width * decoder->height)) {
GST_ERROR ("Desktop resize is unsupported.");
decoder->state = NULL;
return TRUE;
}
switch (encoding) {
case ENCODING_TYPE_RAW:
ret = rfb_decoder_raw_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_COPYRECT:
ret = rfb_decoder_copyrect_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_RRE:
ret = rfb_decoder_rre_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_CORRE:
ret = rfb_decoder_corre_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_HEXTILE:
ret = rfb_decoder_hextile_encoding (decoder, x, y, w, h);
break;
default:
g_critical ("unimplemented encoding\n");
break;
}
if (!ret)
return FALSE;
decoder->n_rects--;
if (decoder->n_rects == 0) {
decoder->state = NULL;
} else {
decoder->state = rfb_decoder_state_framebuffer_update_rectangle;
}
return TRUE;
}
static gboolean
rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
gint size;
guint8 *frame, *p;
guint32 raw_line_size;
raw_line_size = rect_w * decoder->bytespp;
size = rect_h * raw_line_size;
GST_DEBUG ("Reading %d bytes (%dx%d)", size, rect_w, rect_h);
if (!rfb_decoder_read (decoder, size))
return FALSE;
frame =
decoder->frame + (((start_y * decoder->rect_width) +
start_x) * decoder->bytespp);
p = decoder->data;
while (rect_h--) {
memcpy (frame, p, raw_line_size);
p += raw_line_size;
frame += decoder->line_size;
}
return TRUE;
}
static gboolean
rfb_decoder_copyrect_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
guint16 src_x, src_y;
gint line_width, copyrect_width;
guint8 *src, *dst;
if (!rfb_decoder_read (decoder, 4))
return FALSE;
/* don't forget the offset */
src_x = RFB_GET_UINT16 (decoder->data) - decoder->offset_x;
src_y = RFB_GET_UINT16 (decoder->data + 2) - decoder->offset_y;
GST_DEBUG ("Copyrect from %d %d", src_x, src_y);
copyrect_width = rect_w * decoder->bytespp;
line_width = decoder->line_size;
src =
decoder->prev_frame + ((src_y * decoder->rect_width) +
src_x) * decoder->bytespp;
dst =
decoder->frame + ((start_y * decoder->rect_width) +
start_x) * decoder->bytespp;
while (rect_h--) {
memcpy (dst, src, copyrect_width);
src += line_width;
dst += line_width;
}
return TRUE;
}
static void
rfb_decoder_fill_rectangle (RfbDecoder * decoder, gint x, gint y, gint w,
gint h, guint32 color)
{
/* fill the whole region with the same color */
guint32 *offset;
gint i, j;
for (i = 0; i < h; i++) {
offset =
(guint32 *) (decoder->frame + ((x + (y +
i) * decoder->rect_width)) * decoder->bytespp);
for (j = 0; j < w; j++) {
*(offset++) = color;
}
}
}
static gboolean
rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
guint32 number_of_rectangles, color;
guint16 x, y, w, h;
if (!rfb_decoder_read (decoder, 4 + decoder->bytespp))
return FALSE;
number_of_rectangles = RFB_GET_UINT32 (decoder->data);
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + 4)));
GST_DEBUG ("number of rectangles :%d", number_of_rectangles);
/* color the background of this rectangle */
rfb_decoder_fill_rectangle (decoder, start_x, start_y, rect_w, rect_h, color);
while (number_of_rectangles--) {
if (!rfb_decoder_read (decoder, decoder->bytespp + 8))
return FALSE;
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
x = RFB_GET_UINT16 (decoder->data + decoder->bytespp);
y = RFB_GET_UINT16 (decoder->data + decoder->bytespp + 2);
w = RFB_GET_UINT16 (decoder->data + decoder->bytespp + 4);
h = RFB_GET_UINT16 (decoder->data + decoder->bytespp + 6);
/* draw the rectangle in the foreground */
rfb_decoder_fill_rectangle (decoder, start_x + x, start_y + y, w, h, color);
}
return TRUE;
}
static gboolean
rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
guint32 number_of_rectangles, color;
guint8 x, y, w, h;
if (!rfb_decoder_read (decoder, 4 + decoder->bytespp))
return FALSE;
number_of_rectangles = RFB_GET_UINT32 (decoder->data);
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + 4)));
GST_DEBUG ("number of rectangles :%d", number_of_rectangles);
/* color the background of this rectangle */
rfb_decoder_fill_rectangle (decoder, start_x, start_y, rect_w, rect_h, color);
while (number_of_rectangles--) {
if (!rfb_decoder_read (decoder, decoder->bytespp + 4))
return FALSE;
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
x = RFB_GET_UINT8 (decoder->data + decoder->bytespp);
y = RFB_GET_UINT8 (decoder->data + decoder->bytespp + 1);
w = RFB_GET_UINT8 (decoder->data + decoder->bytespp + 2);
h = RFB_GET_UINT8 (decoder->data + decoder->bytespp + 3);
/* draw the rectangle in the foreground */
rfb_decoder_fill_rectangle (decoder, start_x + x, start_y + y, w, h, color);
}
return TRUE;
}
static gboolean
rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
gint32 x, x_count G_GNUC_UNUSED, x_end, x_max, x_max_16;
gint32 y, y_count G_GNUC_UNUSED, y_end, y_max, y_max_16;
guint8 subencoding, nr_subrect, xy, wh;
guint32 background, foreground;
foreground = background = 0;
x_end = rect_w % 16;
x_count = rect_w / 16 + (x_end > 0 ? 1 : 0);
y_end = rect_h % 16;
y_count = rect_h / 16 + (y_end > 0 ? 1 : 0);
x_max = start_x + rect_w;
y_max = start_y + rect_h;
x_max_16 = x_max - 16;
y_max_16 = y_max - 16;
for (y = start_y; y < y_max; y += 16) {
for (x = start_x; x < x_max; x += 16) {
if (!rfb_decoder_read (decoder, 1))
return FALSE;
subencoding = RFB_GET_UINT8 (decoder->data);
if (subencoding & SUBENCODING_RAW) {
rfb_decoder_raw_encoding (decoder, x, y,
(x <= x_max_16 ? 16 : x_end), (y <= y_max_16 ? 16 : y_end));
continue;
}
if (subencoding & SUBENCODING_BACKGROUND) {
if (!rfb_decoder_read (decoder, decoder->bytespp))
return FALSE;
background = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
}
rfb_decoder_fill_rectangle (decoder, x, y,
(x <= x_max_16 ? 16 : x_end), (y <= y_max_16 ? 16 : y_end),
background);
if (subencoding & SUBENCODING_FOREGROUND) {
if (!rfb_decoder_read (decoder, decoder->bytespp))
return FALSE;
foreground = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
}
if (subencoding & SUBENCODING_ANYSUBRECTS) {
if (!rfb_decoder_read (decoder, 1))
return FALSE;
nr_subrect = RFB_GET_UINT8 (decoder->data);
} else {
continue;
}
if (subencoding & SUBENCODING_SUBRECTSCOLORED) {
guint offset = 0;
if (!rfb_decoder_read (decoder, nr_subrect * (2 + decoder->bytespp)))
return FALSE;
while (nr_subrect--) {
foreground =
GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + offset)));
offset += decoder->bytespp;
xy = RFB_GET_UINT8 (decoder->data + offset++);
wh = RFB_GET_UINT8 (decoder->data + offset++);
rfb_decoder_fill_rectangle (decoder, x + (xy >> 4), y + (xy & 0xF),
1 + (wh >> 4), 1 + (wh & 0xF), foreground);
}
} else {
guint offset = 0;
if (!rfb_decoder_read (decoder, 2 * nr_subrect))
return FALSE;
while (nr_subrect--) {
xy = RFB_GET_UINT8 (decoder->data + offset++);
wh = RFB_GET_UINT8 (decoder->data + offset++);
rfb_decoder_fill_rectangle (decoder, x + (xy >> 4), y + (xy & 0xF),
1 + (wh >> 4), 1 + (wh & 0xF), foreground);
}
}
}
}
return TRUE;
}
static gboolean
rfb_decoder_state_set_colour_map_entries (RfbDecoder * decoder)
{
g_critical ("not implemented");
return FALSE;
}
static gboolean
rfb_decoder_state_server_cut_text (RfbDecoder * decoder)
{
gint cut_text_length;
/* 3 bytes padding, 4 bytes cut_text_length */
if (!rfb_decoder_read (decoder, 7))
return FALSE;
cut_text_length = RFB_GET_UINT32 (decoder->data + 3);
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;
}