// ProjectThreeSourceA.c// This program searches a binary file for a given hex pattern. Files are// found in the binary file via this pattern. The offsets of where the files// were found are output to another file, to be named by user input. Along with// the number of files found and their offsets, the output file will also contain// their sizes.#include <stdio.h>#include <stdlib.h>#include <string.h>#include <stdint.h>struct FileHeader { unsigned long magic_number; unsigned long fileLength;} header; void performFileIO(const char *infile){ FILE *FileIn, *FileOut; char inBuffer[BUFSIZ]; char tempBuffer[4]; int position = 0; // marks the header of a file found within the input file const unsigned char pattern[] = {0xFF, 0x57, 0x50, 0x43}; // properly open the binary file for reading FileIn = fopen(infile, "rb"); if (FileIn == NULL) { printf("The file could not be opened, please check your file and location before trying again.\n"); exit(1); } printf("Enter the name and path for the output file: "); gets(inBuffer); FileOut = fopen(inBuffer, "w+b"); // position the file marker at the beginning of file fseek(FileIn, 0, SEEK_SET); while (!feof(FileIn)) { position++; if (fgetc(FileIn) == pattern[0]) { tempBuffer[0] = pattern[0]; fread(tempBuffer + 1, sizeof(pattern) - 1, 1, FileIn); if (memcmp(pattern, tempBuffer, sizeof(pattern)) == 0) { printf("Match Found.\n"); // now that match is found load pattern into struct header.magic_number = (int)pattern; fseek(FileIn, 21, SEEK_CUR); // find the file size fread(tempBuffer, sizeof(pattern), 1, FileIn); // four byte size of file found // after finding filesize load it into struct header.fileLength = (int)tempBuffer; // retract to the pattern header fseek(FileIn, -25, SEEK_CUR); // read the full - whole file loaded into the structure fread(&header, sizeof(struct FileHeader), 1, FileIn); // present for output to user specified file fwrite(&header, sizeof(struct FileHeader), 1, FileOut); break; continue; } fseek(FileIn, -3, SEEK_CUR); } } // close the files and at the same time flush the buffers fclose(FileIn); fclose(FileOut);}// program entry pointint main(int argc, char *argv[]){ char buffer[BUFSIZ]; printf("Please enter the name and path of the binary file: "); gets(buffer); performFileIO(buffer); printf("\n Done!\n Press enter to exit\n"); getchar(); return 0;}