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147 lignes
4.2 KiB
147 lignes
4.2 KiB
/*
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cmake_minimum_required(VERSION 3.27)
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project(cordiceps)
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set(CMAKE_CXX_STANDARD 23)
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include(FetchContent)
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FetchContent_Declare(
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raylib
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GIT_REPOSITORY https://github.com/raysan5/raylib.git
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GIT_TAG 5.0
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)
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FetchContent_MakeAvailable(raylib)
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add_executable(cordiceps cordiceps.cpp)
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target_link_libraries(cordiceps PUBLIC raylib_static)
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*/
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#include <ranges>
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#include <iostream>
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#include <fstream>
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#include <sstream>
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#include <vector>
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#include <cassert>
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#include <cstdint>
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#include <bit>
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#include <bitset>
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#include "raylib.h"
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std::string slurp(const char* filename) {
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std::ifstream file{filename, std::ios_base::binary};
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std::stringstream data;
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file >> data.rdbuf();
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return data.str();
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}
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std::vector<bool> to_bits(std::string str) {
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std::vector<bool> d;
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for(char c : str) {
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d.push_back(c & 0b10000000);
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d.push_back(c & 0b1000000);
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d.push_back(c & 0b100000);
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d.push_back(c & 0b10000);
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d.push_back(c & 0b1000);
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d.push_back(c & 0b100);
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d.push_back(c & 0b10);
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d.push_back(c & 0b1);
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}
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return d;
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}
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std::string from_bits(std::vector<bool> data) {
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std::string d;
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std::bitset<32> size_bits;
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for(int idx = 0; idx < 32; ++idx) size_bits[idx] = data[idx];
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uint32_t size = size_bits.to_ulong();
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if(std::endian::native == std::endian::little) size = std::byteswap(size);
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std::cerr << "Decoded expected " << size << " bytes" << std::endl;
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for(auto composite : data | std::views::drop(32) | std::views::chunk(8)) {
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char c = 0;
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for(auto b : composite) {
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c *= 2;
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c += b;
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}
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d.push_back(c);
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size--;
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if(size == 0) return d;
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}
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return d;
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}
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void encode(const char* pic, const char* data_source) {
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auto image = LoadImage(pic);
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auto raw_data = slurp(data_source);
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uint32_t size = raw_data.size();
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std::cerr << "Writing expected " << size << " bytes" << std::endl;
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if(std::endian::native == std::endian::little) size = std::byteswap(size);
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std::bitset<32> size_bits;
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size_bits = size;
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std::vector<bool> raw_bits = to_bits(raw_data);
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assert(raw_bits.size() % 8 == 0);
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assert(raw_bits.size() / 8 == raw_data.size());
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std::vector<bool> data;
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for(int idx = 0; idx < 32; ++idx) data.push_back(size_bits[idx]);
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data.insert(data.end(), raw_bits.begin(), raw_bits.end());
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size_t idx = 0;
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for(auto j : std::ranges::iota_view(0, image.height)) {
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for(auto i : std::ranges::iota_view(0, image.width)) {
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auto c = GetImageColor(image, i, j);
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c.r ^= c.r & 1;
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c.g ^= c.g & 1;
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c.b ^= c.b & 1;
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c.r += idx < data.size() ? data[idx] : 0; idx++;
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c.g += idx < data.size() ? data[idx] : 0; idx++;
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c.b += idx < data.size() ? data[idx] : 0; idx++;
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ImageDrawPixel(&image, i, j, c);
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}
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}
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ExportImage(image, pic);
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UnloadImage(image);
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if(raw_bits.size() > idx) {
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std::cout << "\x1b[1;31mWritten bits: " << data.size() << "/" << idx << std::endl;
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} else {
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std::cout << "\x1b[1;32mWritten bits: " << data.size() << "/" << idx << std::endl;
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}
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}
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void decode(const char* pic) {
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auto image = LoadImage(pic);
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std::vector<bool> raw_bits;
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size_t idx = 0;
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for(auto j : std::ranges::iota_view(0, image.height)) {
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for(auto i : std::ranges::iota_view(0, image.width)) {
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auto c = GetImageColor(image, i, j);
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raw_bits.push_back(c.r & 1);
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raw_bits.push_back(c.g & 1);
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raw_bits.push_back(c.b & 1);
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}
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}
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UnloadImage(image);
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auto data = from_bits(raw_bits);
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std::cerr << "Printing expected " << data.size() << " bytes" << std::endl;
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std::ofstream{"cordiceps.out", std::ios_base::binary} << data;
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}
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void CustomLog(int msgType, const char *text, va_list args)
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{
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fprintf(stderr, text, args);
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}
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int main(int argc, char** argv) {
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SetTraceLogLevel(LOG_ERROR);
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SetTraceLogCallback(CustomLog);
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if(argc <= 1) {
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perror("arguments missing, expected: picture then datafile for coding, picture for decoding");
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}
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if(argc == 3) {
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encode(argv[1], argv[2]);
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} else if(argc == 2) {
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decode(argv[1]);
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}
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return 0;
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}
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