sdl.c, undefined.c, md5.c

3 files changed, 271 insertions, 0 deletions

diff --git a/md5.c b/md5.c
new file mode 100644
index 0000000..359fb94
--- /dev/null
+++ b/md5.c
@@ -0,0 +1,130 @@
+/*
+ * This is an attempt at implementing md5 in c, so far it doesn't work :(.
+ * I took the values from wikipedia (https://en.wikipedia.org/wiki/MD5).
+ *
+ * Copyright (C) 2015  Tomasz Kramkowski <tk@the-tk.com>
+ *
+ * This program is free software. It is licensed under version 3 of the
+ * GNU General Public License.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see [http://www.gnu.org/licenses/].
+ */
+#include <math.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void shuffle_bytes(char *buf, size_t length)
+{
+	length = length - length % 4;
+
+	for (size_t i = 0; i < length / 4; i++) {
+		char *bufc = buf + i * 4;
+		char chars[4] = {
+			bufc[3],
+			bufc[2],
+			bufc[1],
+			bufc[0]
+		};
+		strncpy(bufc, chars, 4);
+	}
+}
+
+int main(void)
+{
+	uint32_t *s, *K, a0, b0, c0, d0, length;
+	char input[64] = "";
+
+	length = strlen(input);
+
+	s = (uint32_t []){
+		7, 12, 17, 22,  7, 12, 17, 22,  7, 12, 17, 22,  7, 12, 17, 22,
+		5,  9, 14, 20,  5,  9, 14, 20,  5,  9, 14, 20,  5,  9, 14, 20,
+		4, 11, 16, 23,  4, 11, 16, 23,  4, 11, 16, 23,  4, 11, 16, 23,
+		6, 10, 15, 21,  6, 10, 15, 21,  6, 10, 15, 21,  6, 10, 15, 21};
+
+	K = (uint32_t []){
+		0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
+		0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+		0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+		0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+		0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+		0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
+		0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+		0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+		0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+		0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+		0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
+		0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+		0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
+		0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
+		0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+		0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391};
+
+	a0 = 0x67452301;
+	b0 = 0xefcdab89;
+	c0 = 0x98badcfe;
+	d0 = 0x10325476;
+
+	input[length] = 128;
+
+	for (uint8_t i = length + 1; i < 56; i++)
+		input[i] = 0;
+
+	/*((uint64_t *)input)[7] = (uint64_t)length;*/
+	input[63] = 0;
+
+	for (uint8_t i = 0; i < 64; i++)
+		putchar(input[i]);
+
+	/*shuffle_bytes(input, 64);*/
+	uint32_t *M = (uint32_t *)input;
+
+	uint32_t A = a0, B = b0, C = c0, D = d0;
+
+	for (uint32_t i = 0; i < 64; i ++) {
+		uint16_t F, g, dTemp;
+
+		switch (i) {
+		case 0 ... 15:
+			F = (B & C) | ((~B) & D);
+			g = i;
+			break;
+		case 16 ... 31:
+			F = (D & B) | ((~D) & C);
+			g = (5 * i + 1) % 16;
+			break;
+		case 32 ... 47:
+			F = B ^ C ^ D;
+			g = (3 * i + 5) % 16;
+			break;
+		case 48 ... 63:
+			F = C ^ (B | (~D));
+			g = (7 * i) % 16;
+			break;
+		}
+
+		dTemp = D;
+
+		D = C;
+		C = B;
+		B += ((A + F + K[i] + M[g]) << s[i]) | ((A + F + K[i] + M[g]) >> (32-s[i]));
+		A = dTemp;
+	}
+
+	a0 += A;
+	b0 += B;
+	c0 += C;
+	d0 += D;
+
+	/*shuffle_bytes((char *)&a0, 4);*/
+	/*shuffle_bytes((char *)&b0, 4);*/
+	/*shuffle_bytes((char *)&c0, 4);*/
+	/*shuffle_bytes((char *)&d0, 4);*/
+
+	printf("%.8x%.8x%.8x%.8x\n", a0, b0, c0, d0);
+
+	return EXIT_SUCCESS;
+}
diff --git a/sdl.c b/sdl.c
new file mode 100644
index 0000000..bc75984
--- /dev/null
+++ b/sdl.c
@@ -0,0 +1,131 @@
+#include <SDL2/SDL.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define WIDTH 640
+#define HEIGHT 480
+#define DEPTH 32
+
+enum obj_type {
+	O_QUAD,
+	O_TRIG,
+	O_CIRC
+};
+
+struct quad {
+	uint32_t x, y, width, height;
+};
+
+struct circle {
+	uint32_t x, y, diameter;
+};
+
+typedef union colour_t {
+	struct {
+		uint8_t a, r, g, b;
+	} comp;
+	uint32_t colour;
+} colour_t;
+
+struct object {
+	enum obj_type type;
+	colour_t colour;
+	union {
+		struct quad quad;
+		struct circle circle;
+	} obj;
+};
+
+SDL_Window *window;
+SDL_Renderer *renderer;
+SDL_Texture *screen;
+colour_t *buffer;
+
+struct object *objects;
+uint32_t object_count;
+
+volatile bool running = true;
+
+#define QUOTE(text) "`" #text "'"
+#define SDL_ASSERT(expr, comp, val) \
+	if ((expr) comp val) { \
+		fprintf(stderr, "SDL Error: %s - %s\n", QUOTE(expr), SDL_GetError()); \
+		exit(EXIT_FAILURE); \
+	}
+
+#define SDL_ASSERT_NN(expr) SDL_ASSERT(expr, ==, NULL)
+#define SDL_ASSERT_Z(expr) SDL_ASSERT(expr, !=, 0)
+
+void prep_objects()
+{
+	objects = malloc(1 * sizeof *objects);
+	objects[0] = (struct object){O_QUAD, {{255, 0, 0, 0}}, {.quad = {30, 30, 30, 30}}};
+
+	object_count = 1;
+}
+
+void draw_screen()
+{
+	for (size_t i = 0; i < WIDTH * HEIGHT; i++)
+		buffer[i] = (colour_t){{0, 255, 0, 0}};
+
+	SDL_UpdateTexture(screen, NULL, buffer, 640 * sizeof *buffer);
+	SDL_RenderClear(renderer);
+	SDL_RenderCopy(renderer, screen, NULL, NULL);
+	SDL_RenderPresent(renderer);
+}
+
+void poll_for_events()
+{
+	SDL_Event event;
+
+	while (SDL_PollEvent(&event)) {
+		switch (event.type) {
+		case SDL_QUIT:
+			exit(EXIT_SUCCESS);
+			break;
+		case SDL_KEYDOWN:
+			printf("Key.\n");
+			break;
+		}
+	}
+}
+
+void simulate(uint32_t difference)
+{
+	printf("%lu\n", difference);
+}
+
+uint32_t get_time_delta()
+{
+	static uint32_t old_time;
+	uint32_t time = SDL_GetTicks();
+	uint32_t difference = time - old_time;
+	old_time = time;
+	return difference;
+}
+
+int main(void)
+{
+	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
+	atexit(SDL_Quit);
+
+	window = SDL_CreateWindow("Test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_OPENGL);
+	renderer = SDL_CreateRenderer(window, -1, 0);
+	screen = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 640, 480);
+	buffer = malloc(sizeof *buffer * 640 * 480);
+
+	prep_objects();
+
+	get_time_delta();
+
+	while (running) {
+		draw_screen();
+		poll_for_events();
+		simulate(get_time_delta());
+	}
+
+	return(EXIT_SUCCESS);
+}
diff --git a/undefined.c b/undefined.c
new file mode 100644
index 0000000..38977d8
--- /dev/null
+++ b/undefined.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main(void)
+{
+	int i = 0;
+
+	printf("%d %d %d %d\n", i, i++, i, i++);
+
+	return 0;
+}