guacamole-spice-protocol/protocols/ssh/src/terminal.c

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac-client-ssh.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* James Muehlner <dagger10k@users.sourceforge.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
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#include <guacamole/socket.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
#include "terminal.h"
#include "terminal_handlers.h"
const guac_terminal_color guac_terminal_palette[16] = {
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/* Normal colors */
{0x00, 0x00, 0x00}, /* Black */
{0x99, 0x3E, 0x3E}, /* Red */
{0x3E, 0x99, 0x3E}, /* Green */
{0x99, 0x99, 0x3E}, /* Brown */
{0x3E, 0x3E, 0x99}, /* Blue */
{0x99, 0x3E, 0x99}, /* Magenta */
{0x3E, 0x99, 0x99}, /* Cyan */
{0x99, 0x99, 0x99}, /* White */
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/* Intense colors */
{0x3E, 0x3E, 0x3E}, /* Black */
{0xFF, 0x67, 0x67}, /* Red */
{0x67, 0xFF, 0x67}, /* Green */
{0xFF, 0xFF, 0x67}, /* Brown */
{0x67, 0x67, 0xFF}, /* Blue */
{0xFF, 0x67, 0xFF}, /* Magenta */
{0x67, 0xFF, 0xFF}, /* Cyan */
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{0xFF, 0xFF, 0xFF}, /* White */
};
guac_terminal* guac_terminal_create(guac_client* client,
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int width, int height) {
guac_terminal_attributes default_attributes = {
.foreground = 7,
.background = 0,
.bold = false,
.reverse = false,
.underscore = false
};
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int row, col;
PangoFontMap* font_map;
PangoFont* font;
PangoFontMetrics* metrics;
PangoContext* context;
guac_terminal* term = malloc(sizeof(guac_terminal));
term->client = client;
term->current_attributes =
term->default_attributes = default_attributes;
term->glyph_foreground = default_attributes.foreground;
term->glyph_background = default_attributes.background;
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memset(term->glyphs, 0, sizeof(term->glyphs));
term->glyph_stroke = guac_client_alloc_buffer(client);
term->filled_glyphs = guac_client_alloc_buffer(client);
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/* Get font */
term->font_desc = pango_font_description_new();
pango_font_description_set_family(term->font_desc, "monospace");
pango_font_description_set_weight(term->font_desc, PANGO_WEIGHT_NORMAL);
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pango_font_description_set_size(term->font_desc, 12*PANGO_SCALE);
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font_map = pango_cairo_font_map_get_default();
context = pango_font_map_create_context(font_map);
font = pango_font_map_load_font(font_map, context, term->font_desc);
if (font == NULL) {
guac_client_log_error(term->client, "Unable to get font.");
return NULL;
}
metrics = pango_font_get_metrics(font, NULL);
if (metrics == NULL) {
guac_client_log_error(term->client, "Unable to get font metrics.");
return NULL;
}
/* Calculate character dimensions */
term->char_width =
pango_font_metrics_get_approximate_digit_width(metrics) / PANGO_SCALE;
term->char_height =
(pango_font_metrics_get_descent(metrics)
+ pango_font_metrics_get_ascent(metrics)) / PANGO_SCALE;
term->cursor_row = 0;
term->cursor_col = 0;
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term->term_width = width / term->char_width;
term->term_height = height / term->char_height;
term->char_handler = guac_terminal_echo;
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term->scroll_start = 0;
term->scroll_end = term->term_height - 1;
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/* Create scrollback buffer */
term->scrollback = malloc(term->term_height * sizeof(guac_terminal_char*));
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/* Init buffer */
for (row = 0; row < term->term_height; row++) {
/* Create row */
guac_terminal_char* current_row =
term->scrollback[row] = malloc(term->term_width * sizeof(guac_terminal_char));
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/* Init row */
for (col = 0; col < term->term_width; col++) {
/* Empty character, default colors */
current_row[col].value = '\0';
current_row[col].attributes = term->default_attributes;
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}
}
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/* Init display */
term->display = guac_terminal_display_alloc(term->term_width,
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term->term_height);
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/* Clear with background color */
guac_terminal_clear(term,
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0, 0, term->term_height, term->term_width,
term->current_attributes.background);
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return term;
}
void guac_terminal_free(guac_terminal* term) {
/* Free scrollback buffer */
for (int row = 0; row < term->term_height; row++)
free(term->scrollback[row]);
free(term->scrollback);
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/* Free display */
guac_terminal_display_free(term->display);
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}
/**
* Returns the location of the given character in the glyph cache layer,
* sending it first if necessary. The location returned is in characters,
* and thus must be multiplied by the glyph width to obtain the actual
* location within the glyph cache layer.
*/
int __guac_terminal_get_glyph(guac_terminal* term, char c) {
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guac_socket* socket = term->client->socket;
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int location;
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/* Use foreground color */
const guac_terminal_color* color =
&guac_terminal_palette[term->glyph_foreground];
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/* Use background color */
const guac_terminal_color* background =
&guac_terminal_palette[term->glyph_background];
cairo_surface_t* surface;
cairo_t* cairo;
PangoLayout* layout;
/* Return glyph if exists */
if (term->glyphs[(int) c])
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return term->glyphs[(int) c] - 1;
location = term->next_glyph++;
/* Otherwise, draw glyph */
surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
term->char_width, term->char_height);
cairo = cairo_create(surface);
/* Get layout */
layout = pango_cairo_create_layout(cairo);
pango_layout_set_font_description(layout, term->font_desc);
pango_layout_set_text(layout, &c, 1);
/* Draw */
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cairo_set_source_rgba(cairo,
color->red / 255.0,
color->green / 255.0,
color->blue / 255.0,
1.0 /* alpha */ );
cairo_move_to(cairo, 0.0, 0.0);
pango_cairo_show_layout(cairo, layout);
/* Free all */
g_object_unref(layout);
cairo_destroy(cairo);
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/* Send glyph and update filled flyphs */
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guac_protocol_send_png(socket, GUAC_COMP_OVER, term->glyph_stroke, location * term->char_width, 0, surface);
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guac_protocol_send_rect(socket, term->filled_glyphs,
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location * term->char_width, 0,
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term->char_width, term->char_height);
guac_protocol_send_cfill(socket, GUAC_COMP_OVER, term->filled_glyphs,
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background->red,
background->green,
background->blue,
0xFF);
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guac_protocol_send_copy(socket, term->glyph_stroke,
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location * term->char_width, 0, term->char_width, term->char_height,
GUAC_COMP_OVER, term->filled_glyphs, location * term->char_width, 0);
term->glyphs[(int) c] = location+1;
cairo_surface_destroy(surface);
/* Return glyph */
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return location;
}
/**
* Sets the attributes of the glyph cache layer such that future copies from
* this layer will display as expected.
*/
int __guac_terminal_set_colors(guac_terminal* term,
guac_terminal_attributes* attributes) {
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guac_socket* socket = term->client->socket;
const guac_terminal_color* background_color;
int background, foreground;
/* Handle reverse video */
if (attributes->reverse) {
background = attributes->foreground;
foreground = attributes->background;
}
else {
foreground = attributes->foreground;
background = attributes->background;
}
/* Handle bold */
if (attributes->bold && foreground <= 7)
foreground += 8;
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/* Get background color */
background_color = &guac_terminal_palette[background];
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/* If foreground different from current, colorize */
if (foreground != term->glyph_foreground) {
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/* Get color */
const guac_terminal_color* color =
&guac_terminal_palette[foreground];
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/* Colorize letter */
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guac_protocol_send_rect(socket, term->glyph_stroke,
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0, 0,
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term->char_width * term->next_glyph, term->char_height);
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guac_protocol_send_cfill(socket, GUAC_COMP_ATOP, term->glyph_stroke,
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color->red,
color->green,
color->blue,
255);
}
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/* If any color change at all, update filled */
if (foreground != term->glyph_foreground
|| background != term->glyph_background) {
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/* Set background */
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guac_protocol_send_rect(socket, term->filled_glyphs,
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0, 0,
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term->char_width * term->next_glyph, term->char_height);
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guac_protocol_send_cfill(socket, GUAC_COMP_OVER, term->filled_glyphs,
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background_color->red,
background_color->green,
background_color->blue,
255);
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/* Copy stroke */
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guac_protocol_send_copy(socket, term->glyph_stroke,
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0, 0,
term->char_width * term->next_glyph, term->char_height,
GUAC_COMP_OVER, term->filled_glyphs,
0, 0);
}
term->glyph_foreground = foreground;
term->glyph_background = background;
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return 0;
}
/**
* Sends the given character to the terminal at the given row and column,
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* rendering the charater immediately. This bypasses the guac_terminal_display
* mechanism and is intended for flushing of updates only.
*/
int __guac_terminal_set(guac_terminal* term, int row, int col, char c) {
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guac_socket* socket = term->client->socket;
int location = __guac_terminal_get_glyph(term, c);
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return guac_protocol_send_copy(socket,
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term->filled_glyphs,
location * term->char_width, 0, term->char_width, term->char_height,
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GUAC_COMP_OVER, GUAC_DEFAULT_LAYER,
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term->char_width * col,
term->char_height * row);
}
int guac_terminal_set(guac_terminal* term, int row, int col, char c) {
/* Build character with current attributes */
guac_terminal_char guac_char;
guac_char.value = c;
guac_char.attributes = term->current_attributes;
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/* Set display */
guac_terminal_display_set(term->display, row, col, &guac_char);
return 0;
}
int guac_terminal_write(guac_terminal* term, const char* c, int size) {
while (size > 0) {
term->char_handler(term, *(c++));
size--;
}
return 0;
}
int guac_terminal_copy(guac_terminal* term,
int src_row, int src_col, int rows, int cols,
int dst_row, int dst_col) {
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/* Update display */
guac_terminal_display_copy(term->display,
dst_row, dst_col,
src_row, src_col,
cols, rows);
return 0;
}
int guac_terminal_clear(guac_terminal* term,
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int row, int col, int rows, int cols, int background_color) {
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/* Build space */
guac_terminal_char character;
character.value = ' ';
character.attributes.reverse = false;
character.attributes.background = background_color;
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/* Fill with color */
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guac_terminal_display_set_rect(term->display,
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row, col, cols, rows, &character);
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return 0;
}
int guac_terminal_scroll_up(guac_terminal* term,
int start_row, int end_row, int amount) {
/* Calculate height of scroll region */
int height = end_row - start_row + 1;
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return
/* Move rows within scroll region up by the given amount */
guac_terminal_copy(term,
start_row + amount, 0,
height - amount, term->term_width,
start_row, 0)
/* Fill new rows with background */
|| guac_terminal_clear(term,
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end_row - amount + 1, 0, amount, term->term_width,
term->current_attributes.background);
}
int guac_terminal_scroll_down(guac_terminal* term,
int start_row, int end_row, int amount) {
/* Calculate height of scroll region */
int height = end_row - start_row + 1;
return
/* Move rows within scroll region down by the given amount */
guac_terminal_copy(term,
start_row, 0,
height - amount, term->term_width,
start_row + amount, 0)
/* Fill new rows with background */
|| guac_terminal_clear(term,
start_row, 0, amount, term->term_width,
term->current_attributes.background);
}
int guac_terminal_clear_range(guac_terminal* term,
int start_row, int start_col,
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int end_row, int end_col, int background_color) {
/* If not at far left, must clear sub-region to far right */
if (start_col > 0) {
/* Clear from start_col to far right */
if (guac_terminal_clear(term,
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start_row, start_col, 1, term->term_width - start_col,
background_color))
return 1;
/* One less row to clear */
start_row++;
}
/* If not at far right, must clear sub-region to far left */
if (end_col < term->term_width - 1) {
/* Clear from far left to end_col */
if (guac_terminal_clear(term,
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end_row, 0, 1, end_col + 1,
background_color))
return 1;
/* One less row to clear */
end_row--;
}
/* Remaining region now guaranteed rectangular. Clear, if possible */
if (start_row <= end_row) {
if (guac_terminal_clear(term,
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start_row, 0, end_row - start_row + 1, term->term_width,
background_color))
return 1;
}
return 0;
}
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guac_terminal_display* guac_terminal_display_alloc(int width, int height) {
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guac_terminal_display_char* current;
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int x, y;
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/* Allocate display */
guac_terminal_display* display = malloc(sizeof(guac_terminal_display));
/* Initial value of all characters in the display */
guac_terminal_char blank = {
.value = ' ',
.attributes = {
.background = 0
}
};
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/* Set width and height */
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display->width = width;
display->height = height;
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/* Alloc display */
display->characters = malloc(width * height *
sizeof(guac_terminal_display_char));
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/* Init each display buffer row */
current = display->characters;
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for (y=0; y<height; y++) {
/* Init entire row to NOP */
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for (x=0; x<width; x++) {
current->current = blank;
current->next.type = GUAC_CHAR_NOP;
current++;
}
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}
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return display;
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}
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void guac_terminal_display_free(guac_terminal_display* display) {
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/* Free characters buffer */
free(display->characters);
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/* Free display */
free(display);
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}
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void guac_terminal_display_resize(guac_terminal_display* display,
int width, int height) {
/* STUB */
}
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void guac_terminal_display_set(guac_terminal_display* display, int r, int c,
guac_terminal_char* character) {
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/* Get operation at coordinate */
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guac_terminal_display_char* disp_char =
&(display->characters[r*display->width + c]);
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/* Store operation */
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disp_char->next.type = GUAC_CHAR_SET;
disp_char->next.character = *character;
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}
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void guac_terminal_display_copy(guac_terminal_display* display,
int dst_row, int dst_column,
int src_row, int src_column,
int w, int h) {
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int row, column;
/* FIXME: Handle intersections between src and dst rects */
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guac_terminal_display_char* current_row =
&(display->characters[dst_row*display->width + dst_column]);
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guac_terminal_display_char* src_current_row =
&(display->characters[src_row*display->width + src_column]);
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/* Set rectangle to copy operations */
for (row=0; row<h; row++) {
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guac_terminal_display_char* current = current_row;
guac_terminal_display_char* src_current = src_current_row;
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for (column=0; column<w; column++) {
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/* If copying existing display operation, just copy that rather
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* than create a new copy op */
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if (src_current->next.type != GUAC_CHAR_NOP)
current->next = src_current->next;
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/* Store operation */
else {
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current->next.type = GUAC_CHAR_COPY;
current->next.row = src_row + row;
current->next.column = src_column + column;
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}
/* Next column */
current++;
src_current++;
}
/* Next row */
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current_row += display->width;
src_current_row += display->width;
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}
}
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void guac_terminal_display_set_rect(guac_terminal_display* display,
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int row, int column, int w, int h,
guac_terminal_char* character) {
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guac_terminal_display_char* current_row =
&(display->characters[row*display->width + column]);
/* Set rectangle contents to given character */
for (row=0; row<h; row++) {
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guac_terminal_display_char* current = current_row;
for (column=0; column<w; column++) {
/* Store operation */
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current->next.type = GUAC_CHAR_SET;
current->next.character = *character;
/* Next column */
current++;
}
/* Next row */
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current_row += display->width;
}
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}
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void __guac_terminal_display_flush_copy(guac_terminal_display* display,
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guac_terminal* terminal) {
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guac_terminal_display_char* current = display->characters;
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int row, col;
/* For each operation */
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for (row=0; row<display->height; row++) {
for (col=0; col<display->width; col++) {
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/* If operation is a copy operation */
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if (current->next.type == GUAC_CHAR_COPY) {
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/* The determined bounds of the rectangle of contiguous
* operations */
int detected_right = -1;
int detected_bottom = row;
/* The current row or column within a rectangle */
int rect_row, rect_col;
/* The dimensions of the rectangle as determined */
int rect_width, rect_height;
/* The expected row and column source for the next copy
* operation (if adjacent to current) */
int expected_row, expected_col;
/* Current row within a subrect */
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guac_terminal_display_char* rect_current_row;
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/* Determine bounds of rectangle */
rect_current_row = current;
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expected_row = current->next.row;
for (rect_row=row; rect_row<display->height; rect_row++) {
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guac_terminal_display_char* rect_current = rect_current_row;
expected_col = current->next.column;
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/* Find width */
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for (rect_col=col; rect_col<display->width; rect_col++) {
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/* If not identical operation, stop */
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if (rect_current->next.type != GUAC_CHAR_COPY
|| rect_current->next.row != expected_row
|| rect_current->next.column != expected_col)
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break;
/* Next column */
rect_current++;
expected_col++;
}
/* If too small, cannot append row */
if (rect_col-1 < detected_right)
break;
/* As row has been accepted, update rect_row of rect */
detected_bottom = rect_row;
/* For now, only set rect_col bound if uninitialized */
if (detected_right == -1)
detected_right = rect_col - 1;
/* Next row */
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rect_current_row += display->width;
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expected_row++;
}
/* Calculate dimensions */
rect_width = detected_right - col + 1;
rect_height = detected_bottom - row + 1;
/* Mark rect as NOP (as it has been handled) */
rect_current_row = current;
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expected_row = current->next.row;
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for (rect_row=0; rect_row<rect_height; rect_row++) {
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guac_terminal_display_char* rect_current = rect_current_row;
expected_col = current->next.column;
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for (rect_col=0; rect_col<rect_width; rect_col++) {
/* Mark copy operations as NOP */
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if (rect_current->next.type == GUAC_CHAR_COPY
&& rect_current->next.row == expected_row
&& rect_current->next.column == expected_col)
rect_current->next.type = GUAC_CHAR_NOP;
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/* Next column */
rect_current++;
expected_col++;
}
/* Next row */
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rect_current_row += display->width;
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expected_row++;
}
/* Send copy */
guac_protocol_send_copy(terminal->client->socket,
GUAC_DEFAULT_LAYER,
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current->next.column * terminal->char_width,
current->next.row * terminal->char_height,
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rect_width * terminal->char_width,
rect_height * terminal->char_height,
GUAC_COMP_OVER,
GUAC_DEFAULT_LAYER,
col * terminal->char_width,
row * terminal->char_height);
} /* end if copy operation */
/* Next operation */
current++;
}
}
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}
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void __guac_terminal_display_flush_clear(guac_terminal_display* display,
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guac_terminal* terminal) {
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guac_terminal_display_char* current = display->characters;
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int row, col;
/* For each operation */
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for (row=0; row<display->height; row++) {
for (col=0; col<display->width; col++) {
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/* If operation is a cler operation (set to space) */
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if (current->next.type == GUAC_CHAR_SET &&
current->next.character.value == ' ') {
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/* The determined bounds of the rectangle of contiguous
* operations */
int detected_right = -1;
int detected_bottom = row;
/* The current row or column within a rectangle */
int rect_row, rect_col;
/* The dimensions of the rectangle as determined */
int rect_width, rect_height;
/* Color of the rectangle to draw */
int color;
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if (current->next.character.attributes.reverse)
color = current->next.character.attributes.foreground;
else
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color = current->next.character.attributes.background;
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const guac_terminal_color* guac_color =
&guac_terminal_palette[color];
/* Current row within a subrect */
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guac_terminal_display_char* rect_current_row;
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/* Determine bounds of rectangle */
rect_current_row = current;
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for (rect_row=row; rect_row<display->height; rect_row++) {
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guac_terminal_display_char* rect_current = rect_current_row;
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/* Find width */
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for (rect_col=col; rect_col<display->width; rect_col++) {
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int joining_color;
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if (rect_current->next.character.attributes.reverse)
joining_color =
current->next.character.attributes.foreground;
else
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joining_color =
current->next.character.attributes.background;
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/* If not identical operation, stop */
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if (rect_current->next.type != GUAC_CHAR_SET
|| rect_current->next.character.value != ' '
|| joining_color != color)
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break;
/* Next column */
rect_current++;
}
/* If too small, cannot append row */
if (rect_col-1 < detected_right)
break;
/* As row has been accepted, update rect_row of rect */
detected_bottom = rect_row;
/* For now, only set rect_col bound if uninitialized */
if (detected_right == -1)
detected_right = rect_col - 1;
/* Next row */
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rect_current_row += display->width;
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}
/* Calculate dimensions */
rect_width = detected_right - col + 1;
rect_height = detected_bottom - row + 1;
/* Mark rect as NOP (as it has been handled) */
rect_current_row = current;
for (rect_row=0; rect_row<rect_height; rect_row++) {
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guac_terminal_display_char* rect_current = rect_current_row;
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for (rect_col=0; rect_col<rect_width; rect_col++) {
int joining_color;
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if (rect_current->next.character.attributes.reverse)
joining_color =
current->next.character.attributes.foreground;
else
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joining_color =
current->next.character.attributes.background;
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/* Mark clear operations as NOP */
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if (rect_current->next.type == GUAC_CHAR_SET
&& rect_current->next.character.value == ' '
&& joining_color == color)
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rect_current->next.type = GUAC_CHAR_NOP;
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/* Next column */
rect_current++;
}
/* Next row */
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rect_current_row += display->width;
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}
/* Send rect */
guac_protocol_send_rect(terminal->client->socket,
GUAC_DEFAULT_LAYER,
col * terminal->char_width,
row * terminal->char_height,
rect_width * terminal->char_width,
rect_height * terminal->char_height);
guac_protocol_send_cfill(terminal->client->socket,
GUAC_COMP_OVER,
GUAC_DEFAULT_LAYER,
guac_color->red, guac_color->green, guac_color->blue,
0xFF);
} /* end if clear operation */
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/* Next operation */
current++;
}
}
}
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void __guac_terminal_display_flush_set(guac_terminal_display* display,
guac_terminal* terminal) {
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guac_terminal_display_char* current = display->characters;
int row, col;
/* For each operation */
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for (row=0; row<display->height; row++) {
for (col=0; col<display->width; col++) {
/* Perform given operation */
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if (current->next.type == GUAC_CHAR_SET) {
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/* Set attributes */
__guac_terminal_set_colors(terminal,
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&(current->next.character.attributes));
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/* Send character */
__guac_terminal_set(terminal, row, col,
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current->next.character.value);
/* Mark operation as handled */
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current->next.type = GUAC_CHAR_NOP;
}
/* Next operation */
current++;
}
}
}
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void guac_terminal_display_flush(guac_terminal_display* display,
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guac_terminal* terminal) {
/* Flush copy operations first */
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__guac_terminal_display_flush_copy(display, terminal);
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/* Flush clear operations (as they're just rects) */
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__guac_terminal_display_flush_clear(display, terminal);
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/* Flush set operations (the only operations remaining) */
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__guac_terminal_display_flush_set(display, terminal);
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}