#include <stdio.h>#include <stdlib.h>#include <string.h>void performFileIO(const char *infile){ FILE *FileIn, *FileOut; char inBuffer[BUFSIZ]; char tempBuffer[4], *tempptr; char outStringData[256]; int currentFile = 1, position = 0; // marks the header of a file found within the input file const unsigned char pattern[] = {0xFF, 0x57, 0x50, 0x43}; long int fileLength; // 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"); fseek(FileIn, 21, SEEK_CUR); // find the file size fread(tempBuffer, sizeof(pattern), 1, FileIn); // four byte size of file found fileLength = (tempBuffer[0] + tempBuffer[1] + tempBuffer[2] + tempBuffer[3]); // retract to the pattern header fseek(FileIn, -25, SEEK_CUR); printf("%d\n", fileLength); // test -> returns -55 //fread(tempptr, sizeof(char), total, FileIn); //fread(tempptr, sizeof(char), sizeof((int)*tempBuffer), FileIn); // read up to the full length of file //sprintf(outStringData, "%-5i\tOffset: %-12i\tSize: %02x%02x%02x%02x\n", currentFile++, position - 1, //tempBuffer[0], tempBuffer[1], tempBuffer[2], tempBuffer[3]); //fwrite(outStringData, sizeof(char), strlen(outStringData), FileOut); //fwrite(tempptr, sizeof(*tempBuffer), strlen(tempptr), FileOut); //fwrite(tempptr, sizeof(char), sizeof((int)*tempBuffer), FileOut); //fwrite(tempptr, sizeof(char), fileLength, FileOut); fwrite(tempptr, sizeof(char) * fileLength, 1, FileOut); break; // just to test one run through a matched loop 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;}