Add portable version files

* Update the directory structure of the repository

Portable/.gitignore

@@ -0,0 +1,3 @@
+*.exe
+*.dll
+*.zip

Portable/Files/FILE_ID.DIZ

@@ -0,0 +1,6 @@
+CRC16 Easy! Version 0.1 (pre-official
+release) - A simple and easy-to-use MS-DOS
+command line program that calculates the
+CRC-16 value for a given file. Free and
+open-source software. Written and compiled in
+Borland C++ 3.1. Created by Devliber in 1997.

Portable/Files/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 1997 Devliber
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Source/CRC16.CPP

@@ -0,0 +1,122 @@
+/*------------------------------------------------------------------------*/
+/*                                                                        */
+/*  CRC16 Easy! Version 0.1 (pre-official release)                        */
+/*  File CRC-16 utility                                                   */
+/*                                                                        */
+/*  Created in May 1997                                                   */
+/*  Copyright (c) 1997 Devliber (https://devliber.com)                    */
+/*                                                                        */
+/*  Written and compiled in Borland C++ 3.1.                              */
+/*                                                                        */
+/*  Licensed under the MIT License. See LICENSE file in the project       */
+/*  root for full license information.                                    */
+/*                                                                        */
+/*------------------------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dos.h>
+#include <time.h>
+
+#define M16 0xA001 /* crc-16 mask */
+
+/* function declarations */
+unsigned int updcrcr(unsigned int, int);
+
+unsigned int crc16tab[256] =
+    {
+        0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
+        0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
+        0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
+        0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
+        0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
+        0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
+        0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
+        0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
+        0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
+        0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
+        0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
+        0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
+        0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
+        0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
+        0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
+        0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
+        0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
+        0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
+        0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
+        0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
+        0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
+        0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
+        0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
+        0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
+        0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
+        0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
+        0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
+        0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
+        0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
+        0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
+        0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
+        0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040};
+
+int main(void)
+{
+    /* variables */
+    char filename[80];
+    unsigned int crc16;
+    int ch;
+    unsigned long num;
+    FILE *fp;
+    time_t t, t1;
+
+    puts("CRC16 Easy!  Version 0.1 (pre-official release)   May 26 1997");
+    puts("Copyright (c) 1997 Devliber. Licensed under the MIT License.\n");
+
+    if (_argc < 2)
+    {
+        puts("Usage is: CRC16 <filename>");
+        return 0;
+    }
+
+    if (_argc > 2)
+    {
+        printf("Too many parameters - %s\n", _argv[2]);
+        return 0;
+    }
+
+    if (strpbrk(_argv[1], "*?"))
+    {
+        puts("Wildcards not allowed");
+        return 2;
+    }
+
+    strcpy(filename, _argv[1]);
+    if ((fp = fopen(filename, "rb")) == NULL)
+    {
+        puts("Can't open file");
+        return 1;
+    }
+
+    num = 0L;
+    crc16 = 0;
+    time(&t);
+    while ((ch = fgetc(fp)) != EOF)
+    {
+        num++;
+        crc16 = updcrcr(crc16, ch);
+    }
+    fclose(fp);
+    time(&t1);
+    printf("%lu byte(s) read, CRC16 is %04X\nDone in %u second(s)\n", num,
+           crc16, t1 - t);
+    return 0;
+}
+
+/* update crc reverse */
+unsigned int updcrcr(unsigned int crc, int c)
+{
+    int tmp;
+    tmp = crc ^ c;
+    crc = (crc >> 8) ^ crc16tab[tmp & 0xff];
+    return crc;
+}