From 3af50b956b8887b64c3c29b30a0008be866b24c4 Mon Sep 17 00:00:00 2001
From: the lemons <citrons@mondecitronne.com>
Date: Sun, 5 Feb 2023 19:06:16 -0600
Subject: initial commit

---
 core.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 core.c

(limited to 'core.c')

diff --git a/core.c b/core.c
new file mode 100644
index 0000000..96ba866
--- /dev/null
+++ b/core.c
@@ -0,0 +1,150 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <assert.h>
+#include <SDL.h>
+
+#include "procfs.h"
+#include "memview.h"
+
+static int screen_width = 640;
+static int screen_height = 480;
+
+static double scale = 5; 
+static double pos_x = 1024;
+static double pos_y = 0;
+
+static int mouse_x = 0;
+static int mouse_y = 0;
+
+SDL_Window *window = NULL;
+SDL_Renderer *renderer = NULL;
+
+int mem_fd;
+struct viewer *viewer;
+
+static void add_scale(double amount) {
+	pos_x += mouse_x / scale;
+	pos_y += mouse_y / scale;
+	scale += amount;
+	if (scale > 50) scale = 50;
+	else if (scale < 0.5) scale = 0.5;
+	pos_x -= mouse_x / scale;
+	pos_y -= mouse_y / scale;
+}
+
+static void goto_addr(uintptr_t addr) {
+	int x, y;
+	to_pos(addr, &x, &y);
+	pos_x = x; pos_y = y;
+	pos_x -= (double) screen_width / 2 * scale;
+	pos_y -= (double) screen_height / 2 * scale;
+}
+
+static void report_error() {
+	fprintf(stderr, "SDL Error: %s\n", SDL_GetError());
+	exit(-1);
+}
+
+static void init_sdl(const char *title) {
+	if (SDL_Init(SDL_INIT_VIDEO) < 0) report_error();
+	window = SDL_CreateWindow(title,
+			SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+			screen_width, screen_height,
+			SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
+	if (window == NULL) report_error();
+	renderer = SDL_CreateRenderer(window, -1, 0);
+	if (renderer == NULL) report_error();
+}
+
+static void deinit_sdl() {
+	SDL_DestroyRenderer(renderer);
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+}
+
+static void handle_events() {
+	bool refresh = false;
+	SDL_Event e;
+	while (SDL_PollEvent(&e)) {
+		switch (e.type) {
+			case SDL_QUIT:
+				exit(0); break;
+			case SDL_WINDOWEVENT:
+				switch (e.window.event) {
+					case SDL_WINDOWEVENT_RESIZED:
+						screen_width = e.window.data1;
+						screen_height = e.window.data2;
+						SDL_SetWindowSize(window, screen_width, screen_height);
+						refresh = true;
+						break;
+					case SDL_WINDOWEVENT_EXPOSED:
+						refresh = true;
+						break;
+					default:
+						break;
+				}
+				break;
+			case SDL_MOUSEMOTION:
+				if (e.motion.state & SDL_BUTTON_RMASK) {
+					pos_x -= (double) e.motion.xrel / scale;
+					pos_y -= (double) e.motion.yrel / scale;
+					refresh = true;
+				}
+				mouse_x = e.motion.x;
+				mouse_y = e.motion.y;
+				break;
+			case SDL_MOUSEWHEEL:
+				if (e.wheel.y == 0) break;
+				add_scale((double) e.wheel.y / 2);
+				refresh = true;
+				break;
+			default:
+				break;
+		}
+	}
+	render_pages(viewer, pos_x, pos_y,
+			screen_width, screen_height, scale, refresh);
+	SDL_RenderPresent(renderer);
+}
+
+void cleanup() {
+	destroy_viewer(viewer);
+	deinit_sdl();
+}
+
+int main(int argc, char *argv[]) {
+	if (argc < 2) {
+		fprintf(stderr, "todo: show usage\n");
+		return -1;
+	}
+	int pid = atoi(argv[1]);
+	if (pid == 0) {
+		fprintf(stderr, "todo: show usage\n");
+		return -1;
+	}
+	mem_fd = procfs_open(pid);
+	if (mem_fd == -1) perror("error attaching to process");
+
+	char title[1024];
+	snprintf(title, 1024, "%s [%d]", argv[0], pid);
+	init_sdl(argv[0]);
+	viewer = create_viewer(mem_fd, renderer);
+	if (!viewer) abort();
+	atexit(cleanup);
+
+	goto_addr(0x7fea87727000);
+
+	int last_time = 0;
+	int current_time = 0;
+	while (1) {
+		handle_events();
+		last_time = current_time;
+		current_time = SDL_GetTicks();
+		int elapsed = current_time - last_time;
+		if (elapsed < 1000 / 30)
+			SDL_Delay(1000 / 30 - elapsed);
+	}
+}
-- 
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