1 files changed, 0 insertions, 304 deletions
diff --git a/cmd/crc.c b/cmd/crc.c
deleted file mode 100644
index b872e6c..0000000
--- a/cmd/crc.c
+++ /dev/null
@@ -1,304 +0,0 @@
-#pragma GCC optimize("Ofast")
-
-#include <endian.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sodium.h>
-#include <getopt.h>
-#include "crc_util.h"
-#include "CRCLib.h"
-#include "crc.h"
-#include "compress_util.h"
-
-const long idat_signature = 1229209940;
-const long iend_signature = 1229278788;
-
-unsigned long first_idat(unsigned char *addr) {
-	int idat_found = 0;
-	unsigned long offset = 8;
-	int jump_offset = 0;
-	int header_type = 0;
-	while(idat_found == 0) {
-		jump_offset = check_header_length(addr, offset);
-		header_type = check_header_length(addr, offset+4);
-		if(header_type == idat_signature) {
-			idat_found = 1;
-		} else {
-			offset = offset + jump_offset + 12;
-		}
-	}
-	return offset;
-}
-
-int total_idat(unsigned char *addr) {
-	int iend_found = 0;
-	int found_idat = 0;
-	unsigned long offset = 8;
-	int jump_offset = 0;
-	int header_type = 0;
-	while(iend_found == 0) {
-		jump_offset = check_header_length(addr, offset);
-		header_type = check_header_length(addr, offset+4);
-		if(header_type == iend_signature) {
-			iend_found = 1;
-		} else {
-			if(header_type == idat_signature) {
-				found_idat++;
-			}
-			offset = offset + jump_offset + 12;
-		}
-	}
-	return found_idat;
-}
-
-int update_file_crc(unsigned char *addr, unsigned long offset , unsigned int crc_num) {
-	int startCRC = 8 + offset + check_header_length(addr, offset);
-	unsigned char new_crc;
-	for(int i = 0; i < 4; i++) {
-		new_crc = crc_num >> (8*(3-i)) & 0xFF;
-		addr[startCRC+i] = new_crc;
-	}
-	return 0;
-}
-
-void random_data_change(unsigned char *color_data, int width, int length) {
-	int searching = 1;
-	size_t rounds = 0;
-	width = 16;
-	int color_range = 3;	
-	unsigned char temp_color_data[length];
-
-	do {
-		rounds++;
-		// Creating temporary data set
-		memcpy(temp_color_data, color_data, length);
-		// Generating random byte to change
-		int random_num = randombytes_uniform(length);
-		// Checking for index break
-		if(random_num % ((width * color_range) + 1)) {
-			if(color_data[random_num] == 255) {
-				temp_color_data[random_num]--;
-			} else {
-				temp_color_data[random_num]++;
-			}
-			unsigned char *check_data_buff = NULL;
-			size_t check_data_length = 0;
-			zlib_compress_data(temp_color_data, length, &check_data_buff, &check_data_length);
-
-			unsigned char full_data[check_data_length+4];
-			full_data[0] = 0x49;
-			full_data[1] = 0x44;
-			full_data[2] = 0x41;
-			full_data[3] = 0x54;
-			for(int i = 0; i < check_data_length; i++) {
-				full_data[i+4] = check_data_buff[i];
-			}
-			unsigned int temp_crc = crc(full_data, check_data_length);
-			if ((temp_crc >> (8*3)) == 10 ) {
-				printf("Found in %zu rounds!\n", rounds);
-				memcpy(color_data, temp_color_data, length);
-				searching = 0;
-			}
-			free(check_data_buff);
-		}
-	
-	} while(searching == 1);
-}
-
-void build_png_file(struct PNG_FILE_STRUCT *png_file, char *out_file_name) {
-	FILE *fp;
-
-	fp = fopen(out_file_name, "w");
-
-	union{
-		unsigned char data[sizeof(struct PNG_START_FILE_STRUCT)];
-		struct PNG_START_FILE_STRUCT png_data;
-	}start_data;
-
-	start_data.png_data = png_file->png_start_data;
-
-	// IHDR Data
-	for(int i = 0; i < sizeof(start_data.data); i++) {
-		fputc(start_data.data[i], fp);
-	}
-	// IDAT Data
-	for(int i = 0; i < 4; i++) {
-		fputc(png_file->png_idat_data.idat_length[i], fp);
-	}
-	for(int i = 0; i < 4; i++) {
-		fputc(png_file->png_idat_data.idat_header[i], fp);
-	}
-	for(int i = 0; i < be32toh(png_file->png_idat_data.idat_data_length); i++) {
-		fputc(png_file->png_idat_data.idat_data[i], fp);
-	}
-	// Generating CRC
-	unsigned char full_data[be32toh(png_file->png_idat_data.idat_data_length)+4];
-	for(int i = 0; i < 4; i++) {
-		full_data[i] = png_file->png_idat_data.idat_header[i];
-	}
-	for(int i = 0; i < be32toh(png_file->png_idat_data.idat_data_length); i++) {
-		full_data[i+4] = png_file->png_idat_data.idat_data[i];
-	}
-
-	unsigned int int_crc = crc(full_data, be32toh(png_file->png_idat_data.idat_data_length));
-	unsigned char new_crc[4];
-
-	for(int i = 0; i < 4; i++) {
-		new_crc[i] = int_crc >> (8*(3-i)) & 0xFF;
-		fputc(new_crc[i], fp);
-	}
-	// IEND Data
-	unsigned char IEND_DATA[12] = { 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4E, 0x44, 0xAE, 0x42, 0x60, 0x82};
-	for(int i = 0; i < 12; i++) {
-		fputc(IEND_DATA[i], fp);
-	}
-	fclose(fp);
-}
-
-int change_idat_content(unsigned char *addr, struct PNG_FILE_STRUCT *png_file, char *message, int accuracy, unsigned long offset, char *out_file_name) {
-	if(accuracy > 4) {
-		printf("Warning, accuracy cannot be larger than 4");
-		return EXIT_FAILURE;
-	}
-	if(accuracy > 2) {
-		printf("Notice, this could take a long time...");
-	}
-	if(total_idat(addr) < strlen((char*)message)) {
-		printf("Warning, message exceeds IDAT amount\n");
-		exit(EXIT_FAILURE);
-	}
-
-	int idat_length = check_header_length(addr, offset);
-	printf("IDAT Length: %d\n", idat_length);
-
-	long size = 1;
-	size_t idat_byte_length = 0;
-	unsigned char* idat_data = calloc(size, sizeof(unsigned char));
-	for(size_t i = 0; i <= idat_length; i++) {
-		if(i == size) {
-			size *= 2;
-			idat_data = reallocarray(idat_data, size, sizeof(unsigned char));
-		}
-		idat_data[i] = addr[i+offset+8];
-		idat_byte_length = i;
-	}
-	unsigned char temp_idat_data[idat_byte_length];
-	for(int i = 0; i <= idat_length; i++) {
-		temp_idat_data[i] = idat_data[i];
-	}
-	// Decompressing Data
-	unsigned char *uncom_data_buff = NULL;
-	size_t uncom_data_size = 0;
-	zlib_decompress_data(temp_idat_data, idat_byte_length, &uncom_data_buff, &uncom_data_size);
-
-	random_data_change(uncom_data_buff, 16, uncom_data_size);
-	
-	// Compress Data
-	unsigned char *com_data_buff;
-	size_t com_data_size = 0;
-	zlib_compress_data(uncom_data_buff, uncom_data_size, &com_data_buff, &com_data_size);
-
-	png_file->png_idat_data.idat_data = calloc(com_data_size, sizeof(unsigned char));
-
-	png_file->png_idat_data.idat_data_length = be32toh(com_data_size);
-
-	for(size_t i = 0; i < com_data_size; i++) {
-		png_file->png_idat_data.idat_data[i] = com_data_buff[i];
-	}
-
-	// Build PNG File
-	build_png_file(png_file, out_file_name);
-
-	free(uncom_data_buff);
-	free(com_data_buff);
-	free(idat_data);
-	free(png_file->png_idat_data.idat_data);
-
-	return 0;
-}
-
-// This is where it all starts
-int main(int argc, char **argv) {
-	FILE *fp;
-	size_t i = 0;
-	unsigned long offset = 0;
-	struct PNG_FILE_STRUCT png_file_data;
-	char *in_file_name = NULL;
-	char *out_file_name = NULL;
-	char *message = NULL;
-
-	static const struct option long_options[] = {
-		{"help", no_argument, NULL, 'h'},
-		{"file", required_argument, NULL, 'f'},
-		{"outfile", required_argument, NULL, 'o'},
-		{"message", required_argument, NULL, 'm'},
-		{0, 0, 0, 0}
-	};
-
-	const char* usage =
-		"Usage: crc [options]\n"
-		"  -h, --help		Shows help message\n"
-		"  -f, --file		Denotes input file\n"
-		"  -o, --outfile	Denotes output file\n"
-		"  -m, --message	Encoded message\n"
-		"\n";
-
-	int c;
-	while (1) {
-		int option_index = 0;
-		c = getopt_long(argc, argv, "hf:o:m:", long_options ,&option_index);
-		if(c == -1) {
-			break;
-		}
-		switch(c) {
-			case 'h':
-				printf("%s", usage);
-				exit(EXIT_SUCCESS);
-			case 'f':
-				in_file_name = optarg;
-				break;
-			case 'o':
-				out_file_name = optarg;
-				break;
-			case 'm':
-				message = optarg;
-				break;
-		}
-	}
-
-	if(in_file_name == NULL) {
-		printf("Input file required!\n");
-		exit(EXIT_FAILURE);
-	} else if(out_file_name == NULL) {
-		printf("Output file required!\n");
-		exit(EXIT_FAILURE);
-	} else if(message == NULL) {
-		printf("Message required!\n");
-		exit(EXIT_FAILURE);
-	}
-
-	if(sodium_init() == -1) {
-		return EXIT_FAILURE;
-	}
-
-	fp = fopen(in_file_name, "rt");
-	if (fp == NULL) {
-		printf("File error\n");
-		exit(EXIT_FAILURE);
-	}
-
-	unsigned char *file_data = file_to_char_array(fp, &i);
-	fclose(fp);
-
-	populate_start_png(file_data, &png_file_data.png_start_data);
-
-	offset = first_idat(file_data);
-
-	populate_idat_png(file_data, &png_file_data.png_idat_data, offset);
-
-	change_idat_content(file_data, &png_file_data, message, 1, offset, out_file_name);
-
-	free(file_data);
-}