n = fread(p_la, 1, SW_SIZE + LA_SIZE, f_input) ; while(n + i == SW_SIZE + LA_SIZE) { BiggestMatch(p_sw, p_la, 31) ; if(p_la >= p_flag) { i = 32 - (p_la - p_flag) ; memcpy(p_start, p_sw, SW_SIZE) ; p_sw = p_start ; memcpy((char *)p_la_start, (char *)p_la, i) ; p_la = p_la_start ; memset(p_la + i, 0, SW_SIZE + LA_SIZE - i) ; n = fread(p_la + i, 1, SW_SIZE + LA_SIZE - i, f_input) ; } } p_end = p_la + n + i ; while(p_la < p_end) { if(p_end - p_la <= 31) BiggestMatch(p_sw, p_la, p_end - p_la - 1) ; else BiggestMatch(p_sw, p_la, 31) ; if(p_la >= p_flag) { i = 32 - (p_la - p_flag) ; memcpy(p_start, p_sw, SW_SIZE) ; p_sw = p_start ; memcpy((char *)p_la_start, (char *)p_la, i) ; p_la = p_la_start ; memset(p_la + i, 0, SW_SIZE + LA_SIZE - i) ; p_end = p_la + (LA_SIZE - i) ; } } if(curr_len % 8 != 0) /* if the final inputted char bits does not completly fill curr_byte ... */ BytesToBits((unsigned char)0, 8 - curr_len) ; /* ... add enough zeros to complete a byte */ printf("\nFinished compressing to file %s\n", outfile_name) ; break ; case 'd': case 'D': printf("\nEnter file to decompress -> ") ; gets(infile_name) ; while(infile_name[0] == NULL) { printf("\nEnter file to decompress -> ") ; gets(infile_name) ; } f_input = fopen(infile_name,"rb") ; /* opens the test.dat file if it exists */ if(f_input == NULL) { printf("\n***FILE NOT FOUND***\n") ; exit(0) ; } printf("\nEnter file to decompress to -> ") ; gets(outfile_name) ; while(outfile_name[0] == NULL) { printf("\nEnter file to decompress to -> ") ; gets(outfile_name) ; } f_output = fopen(outfile_name,"wb") ; if(f_output == NULL) { printf("\n***ERROR CREATING OUTPUT FILE FOR COMPRESSION***\n") ; exit(0) ; } n = 1 ; curr_byte = (unsigned char)fgetc(f_input) ; curr_len = 8 ; while(n) { if(p_la >= p_flag) { fwrite(p_la_start, 1, p_la - p_la_start, f_output) ; memcpy(p_start, p_sw, SW_SIZE) ; memset(p_la_start, 0, SW_SIZE + LA_SIZE) ; p_la = p_la_start ; p_sw = p_start ; } n = BitsToBytes(&ch, 1) ; switch(ch) { case 0: if(ZeroCodeWrite() == 0) break ; break ; case 1: if(OneCodeWrite() == 0) break ; break ; } } fwrite(p_la_start, 1, p_la - p_la_start, f_output) ; printf("\nFinished uncompressing to file %s\n", outfile_name) ; break ; } fclose(f_input) ; fclose(f_output) ; free(p_start) ; return FAIL ; }