Claude gave me this unobfuscated C code for `long z,x,G;main(){for(puts("P1\n80 80"),scanf("%10lx",&G);3-z/2160;x=++z%81/8-5)putchar(5>x?!(16>>(x^-(x<1))+1&G<<5>>z/6485)^49:10);}`:
#include <stdio.h>
/ * PPM Pattern Generator * * This program generates a 80x80 black and white PPM image based on a * hexadecimal input pattern. The pattern is rendered as ASCII art using * bit manipulation to determine which pixels are on or off. /
int main() { long pixel_index = 0; // Current pixel being processed (0-6399 for 80x80) long horizontal_offset; // Horizontal position relative to center long hex_pattern; // Input hexadecimal pattern
// Output PPM header for 80x80 black and white image
// P1 = ASCII black and white format
// 80 80 = width and height
puts("P1\n80 80");
// Read hexadecimal pattern from user (up to 10 hex digits)
scanf("%10lx", &hex_pattern);
// Process each pixel in the 80x80 image
// Continue until we've processed all pixels
// The condition (3 - pixel_index/2160) continues while pixel_index < 6480
// This accounts for 80x80 = 6400 pixels plus some margin
for (; 3 - pixel_index/2160; ) {
// Move to next pixel and calculate horizontal offset from center
pixel_index++;
horizontal_offset = (pixel_index % 81) / 8 - 5;
// Determine what to output for this pixel
if (horizontal_offset < 5) {
// We're in the main pattern area (central region)
// Complex bit manipulation to determine pixel state:
// 1. Calculate bit position based on horizontal offset
int bit_pos = (horizontal_offset ^ -(horizontal_offset < 1)) + 1;
// 2. Extract relevant bits from the pattern
// hex_pattern << 5 shifts the pattern
// >> (pixel_index/648*5) selects which part of pattern to use based on vertical position
long pattern_bits = (hex_pattern << 5) >> (pixel_index/648 * 5);
// 3. Check if the specific bit is set
int bit_is_set = (16 >> bit_pos) & pattern_bits;
// 4. Invert the bit and XOR with '1' (ASCII 49) to get '0' or '1'
char pixel_char = (!bit_is_set) ^ 49;
putchar(pixel_char);
} else {
// We're outside the pattern area - output newline
putchar(10); // ASCII 10 = newline character
}
}
return 0;/ * USAGE: * Compile: gcc -o pattern_gen pattern_gen.c * Run: ./pattern_gen * Input: Enter a hexadecimal number (e.g., 1234ABCD) * Output: PPM format image data that can be saved to a .pbm file * * EXAMPLE: * ./pattern_gen > output.pbm * Then input: DEADBEEF * * The resulting .pbm file can be viewed with image viewers that support PPM format * or converted to other formats using tools like ImageMagick. */