View difference between Paste ID: HYVvqCDW and CjR8J0PM

 /*
     padxorer by xerpi
     compile with:
         gcc -O3 padxorer.c -o padxorer
     usage:
         padxorer <input file 1> <input file 2>
 
     the output will be <input file 1>.out
 */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <malloc.h>
 
 #define BUF_SIZE (8*1024*1024)
 
 void print_usage();
 
 int main(int argc, char *argv[])
 {
     int ret_val = EXIT_SUCCESS;
 
     if (argc < 3) {
         print_usage();
         ret_val = EXIT_FAILURE;
         goto exit_fail_1;
     }
 
     FILE *fd_in1, *fd_in2, *fd_out;
     if (!(fd_in1 = fopen(argv[1], "rb"))) {
         printf("Error opening input file 1\n");
         ret_val = EXIT_FAILURE;
         goto exit_fail_1;
     }
     if (!(fd_in2 = fopen(argv[2], "rb"))) {
         printf("Error opening input file 2\n");
         ret_val = EXIT_FAILURE;
         goto exit_fail_2;
     }
 
     fseek(fd_in1, 0, SEEK_END);
     unsigned int in_size1 = ftell(fd_in1);
     fseek(fd_in1, 0, SEEK_SET);
 
     fseek(fd_in2, 0, SEEK_END);
     unsigned int in_size2 = ftell(fd_in2);
     fseek(fd_in2, 0, SEEK_SET);
 
     unsigned int min_size = (in_size1 < in_size2) ? in_size1 : in_size2;
 
     char *out_name = malloc(strlen(argv[1]) + strlen(".out") + 1);
     sprintf(out_name, "%s.out", argv[1]);
 
     if (!(fd_out = fopen(out_name, "wb+"))) {
         printf("Cannot create output file\n");
         ret_val = EXIT_FAILURE;
         goto exit_fail_3;
     }
 
     unsigned char *data_buf1 = (unsigned char *)malloc(BUF_SIZE);
     unsigned char *data_buf2 = (unsigned char *)malloc(BUF_SIZE);
 
     #define BAR_LEN 50
     unsigned int step_bytes = min_size/100;
     unsigned int temp_bytes = 0;
     size_t bytes_read1, bytes_read2, total_read = 0, min_read;
     while ((total_read < min_size) && (bytes_read1 = fread(data_buf1, 1, BUF_SIZE, fd_in1)) &&
                                       (bytes_read2 = fread(data_buf2, 1, BUF_SIZE, fd_in2))) {
         min_read = (bytes_read1 < bytes_read2) ? bytes_read1 : bytes_read2;
         total_read += min_read;
         temp_bytes += min_read;
         size_t i;
         for (i = 0; i < min_read; i++) {
             data_buf1[i] ^= data_buf2[i];
         }
         fwrite(data_buf1, 1, min_read, fd_out);
 
         if ((temp_bytes >= step_bytes) || (total_read == min_size)) {
             temp_bytes = 0;
             unsigned int percent = (unsigned int)(total_read*(100.0/min_size));
             printf("%3i%% [", percent);
             int j;
             int bar_size = (BAR_LEN*percent)/100;
             for (j = 0; j < BAR_LEN; j++) {
                 if (j < bar_size) printf("=");
                 else if (j == bar_size) printf(">");
                 else printf(" ");
             }
             printf("]\r");
             fflush(stdout);
         }
     }
     fflush(fd_out);
     fclose(fd_out);
     free(data_buf1);
     free(data_buf2);
     printf("\nFinished!\n");
 exit_fail_3:
     free(out_name);
     fclose(fd_in2);
 exit_fail_2:
     fclose(fd_in1);
 exit_fail_1:
     return ret_val;
 }
 
 void print_usage()
 {
     printf("padxorer by xerpi\n"
            "usage: padxorer <input file 1> <input file 2>\n"
            "the output will be <input file 1>.out\n");
 }