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SUB-OS/gui/gui_apps.c
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subhobhai943andClaude Opus 4.8 c414c20b44 feat(rust,gui): RLE compression codec + Rust Lab desktop app 
Rust kernel expansion:
- rust/src/compress/mod.rs (new): memory-safe PackBits-style run-length
  encoding codec (rle_compress / rle_decompress) with C-ABI shims, registered
  in lib.rs. C fallbacks added to rust_fallback.c so aarch64/armv8i match.
- include/kernel/rust.h: FFI declarations for the codec.
- LazyBox: new `rle <text>` applet that compresses, decompresses, prints the
  ratio and verifies the round-trip is lossless.

GUI expansion:
- gui/gui_apps.c: "Rust Lab" app -- a live dashboard for the Rust subsystem.
  Shows CRC-32C/Adler-32 of a sample, measured ChaCha20/SHA3-256/AES-128
  throughput as scaled bars plus a composite score (benchmark run once at
  launch and cached), and a live ChaCha20 CSPRNG byte stream refreshed
  periodically. Per-window state freed on close.
- Registered "Rust Lab" (info icon) in the desktop app table and on the
  desktop; desktop icon indices updated for the new entry.

Verified: clean build on x86_64/aarch64/armv8i; boots through the SUB login to
the desktop with the new Rust Lab icon rendering (screenshotted); checksum
self-test prints, 0 panics / 0 OOM.

Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Fh5z6V7nGPbHvqVG5p4CXX
2026-08-25 20:06:13 +05:30

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// High-Resolution GUI Applications for SUB-OS Desktop (800x600)
#include <gui/gui_apps.h>
#include <gui/gui_gfx.h>
#include <gui/gui_theme.h>
#include <drivers/rtc.h>
#include <drivers/cpufreq.h>
#include <kernel/tsc.h>
#include <mm/kmalloc.h>
#include <mm/pmm.h>
#include <kernel/printk.h>
#include <kernel/rust.h>
#include <lib/string.h>
#include <lib/printf.h>
static int simple_atoi(const char* s) {
if (!s) return 0;
int res = 0;
int sign = 1;
if (*s == '-') { sign = -1; s++; }
while (*s >= '0' && *s <= '9') {
res = res * 10 + (*s - '0');
s++;
}
return res * sign;
}
// =================================================================
// 1. System Performance Monitor App (High-Res 320x240)
// =================================================================
/* Rolling trace of live heap utilisation (percent), newest sample on the right.
* Seeded flat and advanced one sample per repaint from real allocator stats. */
static uint8_t g_heap_history[60];
static bool g_heap_history_seeded = false;
static void sysmon_sample_heap(uint8_t pct) {
if (!g_heap_history_seeded) {
for (int i = 0; i < 60; i++) g_heap_history[i] = pct;
g_heap_history_seeded = true;
return;
}
for (int i = 0; i < 59; i++) g_heap_history[i] = g_heap_history[i + 1];
g_heap_history[59] = pct;
}
static void sysmon_paint(gui_window_t* win) {
int cx = win->x + 12;
int cy = win->y + GUI_TITLEBAR_HEIGHT + 10;
/* Pull live figures straight from the kernel allocators. */
uint64_t heap_used = (uint64_t)heap_get_used_bytes();
uint64_t heap_total = (uint64_t)heap_get_total_bytes();
uint64_t heap_free = (uint64_t)heap_get_free_bytes();
uint64_t heap_grows = (uint64_t)heap_get_grow_count();
uint32_t heap_pct = heap_total ? (uint32_t)((heap_used * 100) / heap_total) : 0;
if (heap_pct > 100) heap_pct = 100;
uint64_t ram_free_mb = (pmm_get_free_pages() * PMM_PAGE_SIZE) / (1024 * 1024);
uint64_t ram_total_mb = pmm_get_usable_memory() / (1024 * 1024);
sysmon_sample_heap((uint8_t)heap_pct);
gui_gfx_draw_string_16_shadow(cx, cy, "Heap Utilization History (Live)", GUI_THEME_PRIMARY, GUI_COLOR_BLACK);
// Heap Graph Box
int graph_x = cx;
int graph_y = cy + 20;
int graph_w = win->width - 24;
int graph_h = 70;
gui_gfx_fill_rect(graph_x, graph_y, graph_w, graph_h, GUI_THEME_BG_DARK);
gui_gfx_draw_rect(graph_x, graph_y, graph_w, graph_h, GUI_THEME_BORDER);
// Plot Grid Lines
for (int gy = graph_y + 14; gy < graph_y + graph_h; gy += 14) {
gui_gfx_draw_line(graph_x + 1, gy, graph_x + graph_w - 2, gy, 0xFF1E293B);
}
for (int gx = graph_x + 30; gx < graph_x + graph_w; gx += 30) {
gui_gfx_draw_line(gx, graph_y + 1, gx, graph_y + graph_h - 2, 0xFF1E293B);
}
// Plot Waveform from the live heap trace
for (int i = 0; i < 59 && (i * 5 + 5) < graph_w; i++) {
int y1 = graph_y + graph_h - 3 - (g_heap_history[i] * (graph_h - 6)) / 100;
int y2 = graph_y + graph_h - 3 - (g_heap_history[i + 1] * (graph_h - 6)) / 100;
gui_gfx_draw_line(graph_x + 4 + i * 5, y1, graph_x + 4 + (i + 1) * 5, y2, GUI_THEME_SUCCESS);
}
// Heap Usage Bar (real used / total)
char buf[80];
int mem_y = graph_y + graph_h + 12;
snprintf(buf, sizeof(buf), "Heap: %llu / %llu KB (%u%%)",
(unsigned long long)(heap_used / 1024),
(unsigned long long)(heap_total / 1024), heap_pct);
gui_gfx_draw_string_16(cx, mem_y, buf, GUI_THEME_TEXT_MAIN);
int bar_y = mem_y + 20;
int bar_w = win->width - 24;
gui_gfx_fill_rect(cx, bar_y, bar_w, 12, GUI_THEME_BG_DARK);
gui_gfx_fill_rect(cx, bar_y, (int)((uint64_t)bar_w * heap_pct / 100), 12,
(heap_pct >= 90) ? GUI_THEME_DANGER : GUI_THEME_ACCENT);
gui_gfx_draw_rect(cx, bar_y, bar_w, 12, GUI_THEME_BORDER);
// System Telemetry Metrics (live)
cpufreq_stats_t stats = cpufreq_get_stats();
snprintf(buf, sizeof(buf), "Clock: %u.%03u GHz | Heap free: %llu KB | Grows: %llu",
stats.current_khz / 1000000, (stats.current_khz % 1000000) / 1000,
(unsigned long long)(heap_free / 1024), (unsigned long long)heap_grows);
gui_gfx_draw_string(cx, bar_y + 20, buf, GUI_THEME_TEXT_MUTED);
snprintf(buf, sizeof(buf), "System RAM: %llu MB free / %llu MB usable",
(unsigned long long)ram_free_mb, (unsigned long long)ram_total_mb);
gui_gfx_draw_string(cx, bar_y + 32, buf, GUI_THEME_TEXT_DIM);
}
void gui_app_sysmon_launch(int x, int y, int w, int h) {
gui_window_t* win = gui_wm_create_window("System Monitor", x, y, (w > 0) ? w : 330, (h > 0) ? h : 230);
if (win) {
win->paint = sysmon_paint;
}
}
// =================================================================
// 3. File Manager Explorer App (High-Res 380x240)
// =================================================================
static void fileman_paint(gui_window_t* win) {
int cx = win->x + 12;
int cy = win->y + GUI_TITLEBAR_HEIGHT + 10;
// Address Bar
gui_gfx_fill_rect(cx, cy, win->width - 24, 22, GUI_THEME_BG_DARK);
gui_gfx_draw_rect(cx, cy, win->width - 24, 22, GUI_THEME_BORDER);
gui_gfx_draw_string_16(cx + 8, cy + 3, "Path: /", GUI_THEME_PRIMARY);
// Separator line
int list_y = cy + 30;
gui_gfx_draw_line(win->x + 2, list_y, win->x + win->width - 3, list_y, GUI_THEME_BORDER);
const char* items[] = {
"[DIR] bin", "[DIR] etc",
"[DIR] dev", "[DIR] proc",
"[DIR] sys", "[DIR] home",
"[DIR] mnt", "[DIR] usr",
"[FILE] kernel.elf", "[FILE] readme.txt",
"[FILE] config.h", "[FILE] banner.art"
};
for (int i = 0; i < 12; i++) {
int ix = cx + (i % 2) * 160;
int iy = list_y + 10 + (i / 2) * 22;
if (iy + 18 > win->y + win->height) break;
bool is_dir = (items[i][1] == 'D');
uint32_t col = is_dir ? GUI_THEME_ACCENT : GUI_THEME_TEXT_MAIN;
gui_gfx_draw_string_16(ix, iy, items[i], col);
}
}
void gui_app_fileman_launch(int x, int y, int w, int h) {
gui_window_t* win = gui_wm_create_window("File Explorer", x, y, (w > 0) ? w : 360, (h > 0) ? h : 220);
if (win) {
win->paint = fileman_paint;
}
}
// =================================================================
// 4. GUI Calculator App (High-Res 220x240)
// =================================================================
typedef struct {
char display[16];
int op1;
char op;
bool clear_on_digit;
} calc_data_t;
static void calc_paint(gui_window_t* win) {
calc_data_t* cd = (calc_data_t*)win->user_data;
if (!cd) return;
int cx = win->x + 12;
int cy = win->y + GUI_TITLEBAR_HEIGHT + 10;
// Display Screen
gui_gfx_fill_rect(cx, cy, win->width - 24, 28, GUI_THEME_BG_DARK);
gui_gfx_draw_rect(cx, cy, win->width - 24, 28, GUI_THEME_BORDER);
gui_gfx_draw_string_16(cx + 8, cy + 6, cd->display, GUI_THEME_SUCCESS);
// Button Grid (4x4)
const char* btns[4][4] = {
{"7", "8", "9", "/"},
{"4", "5", "6", "*"},
{"1", "2", "3", "-"},
{"C", "0", "=", "+"}
};
int btn_w = (win->width - 36) / 4;
int btn_h = 28;
int start_y = cy + 38;
for (int r = 0; r < 4; r++) {
for (int c = 0; c < 4; c++) {
int bx = cx + c * (btn_w + 4);
int by = start_y + r * (btn_h + 4);
uint32_t bg = (c == 3 || (r == 3 && c == 2)) ? GUI_THEME_PRIMARY_DARK : GUI_THEME_BG_ELEVATED;
gui_gfx_fill_rect(bx, by, btn_w, btn_h, bg);
gui_gfx_draw_rect(bx, by, btn_w, btn_h, GUI_THEME_BORDER);
gui_gfx_draw_string_16(bx + (btn_w - 8) / 2, by + 6, btns[r][c], GUI_THEME_TEXT_MAIN);
}
}
}
static void calc_event(gui_window_t* win, const gui_event_t* ev) {
calc_data_t* cd = (calc_data_t*)win->user_data;
if (!cd) return;
if (ev->type == GUI_EVENT_MOUSE_DOWN && ev->btn_left) {
int btn_w = (win->width - 36) / 4;
int btn_h = 28;
int start_y = 48; // Relative to client area
int rel_y = ev->rel_y - start_y;
int rel_x = ev->rel_x - 12;
if (rel_y >= 0 && rel_x >= 0) {
int row = rel_y / (btn_h + 4);
int col = rel_x / (btn_w + 4);
if (row >= 0 && row < 4 && col >= 0 && col < 4) {
const char* btns[4][4] = {
{"7", "8", "9", "/"},
{"4", "5", "6", "*"},
{"1", "2", "3", "-"},
{"C", "0", "=", "+"}
};
char val = btns[row][col][0];
if (val >= '0' && val <= '9') {
if (cd->clear_on_digit || strcmp(cd->display, "0") == 0) {
cd->display[0] = val;
cd->display[1] = '\0';
cd->clear_on_digit = false;
} else if (strlen(cd->display) < 10) {
int len = strlen(cd->display);
cd->display[len] = val;
cd->display[len + 1] = '\0';
}
} else if (val == 'C') {
strcpy(cd->display, "0");
cd->op1 = 0; cd->op = 0;
} else if (val == '=') {
int op2 = simple_atoi(cd->display);
int res = 0;
if (cd->op == '+') res = cd->op1 + op2;
else if (cd->op == '-') res = cd->op1 - op2;
else if (cd->op == '*') res = cd->op1 * op2;
else if (cd->op == '/') res = (op2 != 0) ? (cd->op1 / op2) : 0;
snprintf(cd->display, sizeof(cd->display), "%d", res);
cd->clear_on_digit = true;
} else {
cd->op1 = simple_atoi(cd->display);
cd->op = val;
cd->clear_on_digit = true;
}
}
}
} else if (ev->type == GUI_EVENT_CLOSE) {
if (win->user_data) {
kfree(win->user_data);
win->user_data = NULL;
}
}
}
void gui_app_calc_launch(int x, int y, int w, int h) {
gui_window_t* win = gui_wm_create_window("Calculator", x, y, (w > 0) ? w : 220, (h > 0) ? h : 220);
if (win) {
calc_data_t* cd = (calc_data_t*)kzalloc(sizeof(calc_data_t));
strcpy(cd->display, "0");
win->user_data = cd;
win->paint = calc_paint;
win->handle_event = calc_event;
}
}
// =================================================================
// 5. Paint Studio App (High-Res 340x240)
// =================================================================
typedef struct {
uint32_t selected_color;
} paint_data_t;
static void paint_app_paint(gui_window_t* win) {
paint_data_t* pd = (paint_data_t*)win->user_data;
if (!pd) return;
int cx = win->x + 8;
int cy = win->y + GUI_TITLEBAR_HEIGHT + 8;
// Palette Color Swatches
uint32_t colors[] = {GUI_THEME_PRIMARY, GUI_THEME_SUCCESS, GUI_THEME_WARNING, GUI_THEME_DANGER, 0xFFEC4899, GUI_COLOR_WHITE, GUI_COLOR_BLACK};
for (int i = 0; i < 7; i++) {
gui_gfx_fill_rect(cx + i * 28, cy, 24, 18, colors[i]);
gui_gfx_draw_rect(cx + i * 28, cy, 24, 18, (colors[i] == pd->selected_color) ? GUI_COLOR_WHITE : GUI_THEME_BORDER);
}
gui_gfx_draw_line(win->x + 2, cy + 24, win->x + win->width - 3, cy + 24, GUI_THEME_BORDER);
}
static void paint_app_event(gui_window_t* win, const gui_event_t* ev) {
paint_data_t* pd = (paint_data_t*)win->user_data;
if (!pd) return;
if (ev->btn_left) {
if (ev->rel_y <= 24) {
uint32_t colors[] = {GUI_THEME_PRIMARY, GUI_THEME_SUCCESS, GUI_THEME_WARNING, GUI_THEME_DANGER, 0xFFEC4899, GUI_COLOR_WHITE, GUI_COLOR_BLACK};
int idx = (ev->rel_x - 8) / 28;
if (idx >= 0 && idx < 7) {
pd->selected_color = colors[idx];
}
} else {
// Draw on canvas with 4x4 brush
gui_gfx_fill_rect(win->x + ev->rel_x - 2, win->y + GUI_TITLEBAR_HEIGHT + ev->rel_y - 2, 4, 4, pd->selected_color);
}
} else if (ev->type == GUI_EVENT_CLOSE) {
if (win->user_data) {
kfree(win->user_data);
win->user_data = NULL;
}
}
}
void gui_app_paint_launch(int x, int y, int w, int h) {
gui_window_t* win = gui_wm_create_window("Paint Studio", x, y, (w > 0) ? w : 340, (h > 0) ? h : 240);
if (win) {
paint_data_t* pd = (paint_data_t*)kzalloc(sizeof(paint_data_t));
pd->selected_color = GUI_THEME_PRIMARY;
win->user_data = pd;
win->paint = paint_app_paint;
win->handle_event = paint_app_event;
}
}
// =================================================================
// 6. About SUB-OS Dialog App (High-Res 320x180)
// =================================================================
static void about_paint(gui_window_t* win) {
int cx = win->x + 16;
int cy = win->y + GUI_TITLEBAR_HEIGHT + 14;
gui_gfx_draw_string_16_shadow(cx, cy, "SUB-OS Modern Desktop", GUI_THEME_PRIMARY, GUI_COLOR_BLACK);
gui_gfx_draw_string_16(cx, cy + 22, "Version 0.2.0-LTS (x86_64)", GUI_THEME_TEXT_MAIN);
gui_gfx_draw_string(cx, cy + 48, "Architecture : Modular Monolithic Kernel", GUI_THEME_TEXT_MUTED);
gui_gfx_draw_string(cx, cy + 62, "Languages : Modern C++17, Rust, SUB-Lang", GUI_THEME_SUCCESS);
gui_gfx_draw_string(cx, cy + 76, "Author : subhobhai943", GUI_THEME_TEXT_DIM);
gui_gfx_draw_string(cx, cy + 90, "Display : 800x600 TrueColor Double-Buffered", GUI_THEME_ACCENT);
}
void gui_app_about_launch(int x, int y, int w, int h) {
gui_window_t* win = gui_wm_create_window("About SUB-OS", x, y, (w > 0) ? w : 320, (h > 0) ? h : 160);
if (win) {
win->paint = about_paint;
}
}
// =================================================================
// 7. Conway's Game of Life (interactive cellular automaton)
// =================================================================
#define LIFE_COLS 56
#define LIFE_ROWS 34
#define LIFE_TOOLBAR_H 24
#define LIFE_STATUS_H 22
typedef struct {
uint8_t cur[LIFE_ROWS][LIFE_COLS];
uint8_t nxt[LIFE_ROWS][LIFE_COLS];
bool running;
uint32_t generation;
uint32_t frame;
} life_data_t;
// Seed the grid from the Rust ChaCha20 CSPRNG (~28% of cells alive).
static void life_randomize(life_data_t* ld) {
// Static (not on the stack): the desktop is single-threaded, and this keeps
// ~1.9 KB off the kernel stack that the GUI thread runs on.
static uint8_t rnd[LIFE_ROWS * LIFE_COLS];
if (rust_csprng_get_random(rnd, sizeof(rnd)) != 0) {
// Deterministic fallback if the CSPRNG is unavailable.
for (size_t i = 0; i < sizeof(rnd); i++) {
rnd[i] = (uint8_t)((i * 2654435761u) >> 24);
}
}
for (int r = 0; r < LIFE_ROWS; r++) {
for (int c = 0; c < LIFE_COLS; c++) {
ld->cur[r][c] = ((rnd[r * LIFE_COLS + c] & 7) < 2) ? 1 : 0;
}
}
ld->generation = 0;
}
// One tick of the B3/S23 rule with dead borders.
static void life_step(life_data_t* ld) {
for (int r = 0; r < LIFE_ROWS; r++) {
for (int c = 0; c < LIFE_COLS; c++) {
int n = 0;
for (int dr = -1; dr <= 1; dr++) {
for (int dc = -1; dc <= 1; dc++) {
if (dr == 0 && dc == 0) continue;
int rr = r + dr, cc = c + dc;
if (rr >= 0 && rr < LIFE_ROWS && cc >= 0 && cc < LIFE_COLS && ld->cur[rr][cc]) {
n++;
}
}
}
uint8_t alive = ld->cur[r][c];
ld->nxt[r][c] = ((alive && (n == 2 || n == 3)) || (!alive && n == 3)) ? 1 : 0;
}
}
memcpy(ld->cur, ld->nxt, sizeof(ld->cur));
ld->generation++;
}
// Grid cell size and top-left, derived from the current window geometry so the
// board scales when the window is resized. Kept identical in paint and event.
static void life_geometry(gui_window_t* win, int* cell, int* gw, int* gh, int* gx_rel, int* grid_top_rel) {
int avail_w = win->width - 16;
int avail_h = win->height - GUI_TITLEBAR_HEIGHT - LIFE_TOOLBAR_H - LIFE_STATUS_H;
int cw = avail_w / LIFE_COLS;
int ch = avail_h / LIFE_ROWS;
int sz = (cw < ch) ? cw : ch;
if (sz < 2) sz = 2;
*cell = sz;
*gw = sz * LIFE_COLS;
*gh = sz * LIFE_ROWS;
*gx_rel = (win->width - *gw) / 2;
*grid_top_rel = LIFE_TOOLBAR_H;
}
static const char* const LIFE_BTNS[4] = { "Play", "Step", "Random", "Clear" };
#define LIFE_BTN_W 66
#define LIFE_BTN_GAP 72
static void life_paint(gui_window_t* win) {
life_data_t* ld = (life_data_t*)win->user_data;
if (!ld) return;
int cx = win->x + 8;
int top = win->y + GUI_TITLEBAR_HEIGHT;
// Toolbar
for (int i = 0; i < 4; i++) {
int bx = cx + i * LIFE_BTN_GAP;
int by = top + 3;
gui_gfx_fill_rect(bx, by, LIFE_BTN_W, 18, GUI_THEME_BG_DARK);
gui_gfx_draw_rect(bx, by, LIFE_BTN_W, 18, GUI_THEME_BORDER);
const char* label = (i == 0 && ld->running) ? "Pause" : LIFE_BTNS[i];
int tw = (int)strlen(label) * 8;
gui_gfx_draw_string(bx + (LIFE_BTN_W - tw) / 2, by + 5, label, GUI_THEME_TEXT_MAIN);
}
// Board
int cell, gw, gh, gx_rel, grid_top_rel;
life_geometry(win, &cell, &gw, &gh, &gx_rel, &grid_top_rel);
int gx = win->x + gx_rel;
int gy = top + grid_top_rel;
gui_gfx_fill_rect(gx, gy, gw, gh, 0xFF0B1220);
int pop = 0;
for (int r = 0; r < LIFE_ROWS; r++) {
for (int c = 0; c < LIFE_COLS; c++) {
if (ld->cur[r][c]) {
pop++;
gui_gfx_fill_rect(gx + c * cell, gy + r * cell,
(cell > 2) ? cell - 1 : cell,
(cell > 2) ? cell - 1 : cell, GUI_THEME_SUCCESS);
}
}
}
gui_gfx_draw_rect(gx, gy, gw, gh, GUI_THEME_BORDER);
// Status line
char buf[96];
snprintf(buf, sizeof(buf), "Gen %u Pop %d %s -- click cells to toggle",
ld->generation, pop, ld->running ? "RUNNING" : "paused");
gui_gfx_draw_string(cx, gy + gh + 5, buf, GUI_THEME_TEXT_MUTED);
// Advance the automaton while running, throttled so it is watchable.
if (ld->running) {
ld->frame++;
if ((ld->frame & 3) == 0) {
life_step(ld);
}
}
}
static void life_event(gui_window_t* win, const gui_event_t* ev) {
life_data_t* ld = (life_data_t*)win->user_data;
if (!ld) return;
if (ev->type == GUI_EVENT_CLOSE) {
if (win->user_data) {
kfree(win->user_data);
win->user_data = NULL;
}
return;
}
// Act only on the press edge so buttons and cells do not re-fire while held.
if (ev->type != GUI_EVENT_MOUSE_DOWN) return;
int rel_x = ev->rel_x;
int rel_y = ev->rel_y;
// Toolbar row
if (rel_y >= 3 && rel_y < LIFE_TOOLBAR_H) {
int i = (rel_x - 8) / LIFE_BTN_GAP;
int within = (rel_x - 8) - i * LIFE_BTN_GAP;
if (i >= 0 && i < 4 && within >= 0 && within < LIFE_BTN_W) {
switch (i) {
case 0: ld->running = !ld->running; break;
case 1: life_step(ld); break;
case 2: life_randomize(ld); break;
case 3: memset(ld->cur, 0, sizeof(ld->cur)); ld->generation = 0; break;
}
}
return;
}
// Board: toggle the clicked cell
int cell, gw, gh, gx_rel, grid_top_rel;
life_geometry(win, &cell, &gw, &gh, &gx_rel, &grid_top_rel);
int lx = rel_x - gx_rel;
int ly = rel_y - grid_top_rel;
if (lx >= 0 && ly >= 0 && lx < gw && ly < gh) {
int c = lx / cell;
int r = ly / cell;
if (r >= 0 && r < LIFE_ROWS && c >= 0 && c < LIFE_COLS) {
ld->cur[r][c] ^= 1;
}
}
}
void gui_app_life_launch(int x, int y, int w, int h) {
gui_window_t* win = gui_wm_create_window("Game of Life", x, y, (w > 0) ? w : 480, (h > 0) ? h : 380);
if (win) {
life_data_t* ld = (life_data_t*)kzalloc(sizeof(life_data_t));
if (ld) {
life_randomize(ld);
ld->running = true;
}
win->user_data = ld;
win->paint = life_paint;
win->handle_event = life_event;
}
}
// =================================================================
// 8. Rust Kernel Lab -- showcases the memory-safe Rust subsystem
// =================================================================
typedef struct {
rust_crypto_bench_result_t bench; // measured once at launch
bool have_bench;
uint32_t frame;
uint8_t entropy[8]; // live CSPRNG sample
} rustlab_data_t;
static void rustlab_bar(int x, int y, int w, const char* label, uint32_t value,
uint32_t max_value, uint32_t color) {
char buf[48];
gui_gfx_draw_string(x, y, label, GUI_THEME_TEXT_MAIN);
int bx = x + 96;
int bw = w - 96 - 64;
if (bw < 20) bw = 20;
gui_gfx_fill_rect(bx, y, bw, 10, GUI_THEME_BG_DARK);
uint32_t denom = (max_value > 0) ? max_value : 1;
int fill = (int)(((uint64_t)value * (uint64_t)bw) / denom);
if (fill > bw) fill = bw;
gui_gfx_fill_rect(bx, y, fill, 10, color);
gui_gfx_draw_rect(bx, y, bw, 10, GUI_THEME_BORDER);
snprintf(buf, sizeof(buf), "%u MB/s", value);
gui_gfx_draw_string(bx + bw + 6, y, buf, GUI_THEME_TEXT_MUTED);
}
static void rustlab_paint(gui_window_t* win) {
rustlab_data_t* rd = (rustlab_data_t*)win->user_data;
if (!rd) return;
int cx = win->x + 14;
int cy = win->y + GUI_TITLEBAR_HEIGHT + 12;
int w = win->width - 28;
gui_gfx_draw_string_16_shadow(cx, cy, "Rust Kernel Subsystem (no_std)", GUI_THEME_PRIMARY, GUI_COLOR_BLACK);
cy += 26;
// Checksum engine (recomputed live -- it is cheap)
static const char sample[] = "SUB-OS";
uint32_t crc = rust_crc32c((const uint8_t*)sample, 6);
uint32_t adl = rust_adler32((const uint8_t*)sample, 6);
char buf[80];
gui_gfx_draw_string(cx, cy, "Checksums of \"SUB-OS\":", GUI_THEME_SUCCESS);
cy += 14;
snprintf(buf, sizeof(buf), "CRC-32C 0x%08X Adler-32 0x%08X", crc, adl);
gui_gfx_draw_string(cx + 8, cy, buf, GUI_THEME_TEXT_MUTED);
cy += 22;
// Crypto benchmark bars (measured once at launch)
gui_gfx_draw_string(cx, cy, "Crypto throughput (measured):", GUI_THEME_SUCCESS);
cy += 16;
if (rd->have_bench) {
uint32_t mx = rd->bench.chacha20_mbs;
if (rd->bench.sha3_256_mbs > mx) mx = rd->bench.sha3_256_mbs;
if (rd->bench.aes128_mbs > mx) mx = rd->bench.aes128_mbs;
rustlab_bar(cx + 4, cy, w, "ChaCha20", rd->bench.chacha20_mbs, mx, GUI_THEME_ACCENT);
cy += 16;
rustlab_bar(cx + 4, cy, w, "SHA3-256", rd->bench.sha3_256_mbs, mx, GUI_THEME_SUCCESS);
cy += 16;
rustlab_bar(cx + 4, cy, w, "AES-128", rd->bench.aes128_mbs, mx, GUI_THEME_WARNING);
cy += 16;
snprintf(buf, sizeof(buf), "Composite score: %u", rd->bench.score);
gui_gfx_draw_string(cx + 4, cy, buf, GUI_THEME_TEXT_DIM);
cy += 22;
} else {
gui_gfx_draw_string(cx + 4, cy, "benchmark unavailable", GUI_THEME_TEXT_DIM);
cy += 22;
}
// Live CSPRNG entropy, refreshed periodically
if ((rd->frame++ % 20) == 0) {
rust_csprng_get_random(rd->entropy, sizeof(rd->entropy));
}
gui_gfx_draw_string(cx, cy, "ChaCha20 CSPRNG stream:", GUI_THEME_SUCCESS);
cy += 14;
snprintf(buf, sizeof(buf), "%02X %02X %02X %02X %02X %02X %02X %02X",
rd->entropy[0], rd->entropy[1], rd->entropy[2], rd->entropy[3],
rd->entropy[4], rd->entropy[5], rd->entropy[6], rd->entropy[7]);
gui_gfx_draw_string(cx + 8, cy, buf, GUI_THEME_PRIMARY);
}
static void rustlab_event(gui_window_t* win, const gui_event_t* ev) {
if (ev->type == GUI_EVENT_CLOSE && win->user_data) {
kfree(win->user_data);
win->user_data = NULL;
}
}
void gui_app_rustlab_launch(int x, int y, int w, int h) {
gui_window_t* win = gui_wm_create_window("Rust Lab", x, y, (w > 0) ? w : 420, (h > 0) ? h : 300);
if (win) {
rustlab_data_t* rd = (rustlab_data_t*)kzalloc(sizeof(rustlab_data_t));
if (rd) {
rd->have_bench = (rust_crypto_run_benchmark(&rd->bench) == 0);
rust_csprng_get_random(rd->entropy, sizeof(rd->entropy));
}
win->user_data = rd;
win->paint = rustlab_paint;
win->handle_event = rustlab_event;
}
}
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