From d6602155807fb32c44d437d8d6ccd5d5c2a5ddeb Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Thu, 19 Feb 2015 11:51:44 +0000
Subject: [PATCH] fstomdv: turn an fs image into a microdrive cartridge

---
 Kernel/tools/fstomdv.c | 139 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 Kernel/tools/fstomdv.c

diff --git a/Kernel/tools/fstomdv.c b/Kernel/tools/fstomdv.c
new file mode 100644
index 00000000..23d9865b
--- /dev/null
+++ b/Kernel/tools/fstomdv.c
@@ -0,0 +1,139 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+static int mdv_sec = 1;
+static int fslen;
+static uint8_t fsbuf[512 * 253];
+
+static uint8_t mdv_csum(uint8_t *data, int len)
+{
+  uint32_t sum = 0;
+  while(len--) {
+    sum += *data++;
+  }
+  return sum % 0xFF;
+}
+
+
+static void mdv_write(FILE *fp, uint8_t *data, int len)
+{
+  if (fwrite(data, len, 1, fp) != 1) {
+    perror("mdv_write");
+    exit(1);
+  }
+}
+
+static void mdv_make_hdr(uint8_t *buf)
+{
+  memset(buf, 0, 14);
+  buf[0] = 1;
+  buf[1] = mdv_sec++;
+  memcpy(buf + 4, "FUZIX     ", 10);
+  buf[14] = mdv_csum(buf, 14);
+}
+
+static void mdv_make_bufhdr(uint8_t *buf, uint8_t rec, uint8_t *bits)
+{
+  memset(buf, 0, 14);
+  buf[0] = 0;
+  buf[1] = rec;	/* Actually load page */
+  buf[2] = 0;
+  buf[3] = 2;	/* Always 512 bytes */
+  strncpy(buf+4, "FUZIX     ", 10);
+  buf[14] = mdv_csum(buf, 14);
+  memcpy(buf + 15, bits, 512);
+  buf[527] = mdv_csum(buf + 15, 512);
+}
+
+static uint8_t blank[512];
+static uint8_t sectormap[512];
+
+
+static void mdv_write_tape(FILE *fp)
+{
+  uint8_t buf[528];
+  uint8_t *bits;
+  int block = 1;
+  uint8_t *stream = fsbuf;
+  
+  while (block < 254) {  
+    mdv_make_hdr(buf);
+    mdv_write(fp, buf, 15);
+    if (block == 1 || block == 128)
+      bits = sectormap;
+    else {
+      bits = stream;
+      stream += 512;
+    }
+    mdv_make_bufhdr(buf, block, bits);
+    mdv_write(fp, buf, 528);
+    block++;
+  }
+}
+
+static void mdv_make_map(void) {
+  int n = 2;
+  int i;
+
+  memset(sectormap, 0xFF, 512);
+  sectormap[256] = 0xA5;
+  sectormap[257] = 0x5A;
+
+  /* Logical to physical map, so start at 2 and go up missing 128 as its
+     a copy of this map (as is 1) */
+
+  for (i = 0 ; i < 252; i++) {
+    sectormap[i] = n++;
+    if (n == 128)
+      n++;
+  }
+}
+
+static void load_filesystem(char *name)
+{
+  int fd = open(name, O_RDONLY);
+  long len;
+
+  if (fd == -1) {
+    perror(name);
+    exit(1);
+  }
+  len = read(fd, fsbuf, 253 * 512);
+  if (len > 252 * 512) {
+    fprintf(stderr, "%s: too long.\n");
+    exit(1);
+  }
+  if (len < 65536) {
+    fprintf(stderr, "%s: too short ?\n");
+    exit(1);
+  }
+  fslen = len;
+}
+
+void main(int argc, char *argv[])
+{
+  FILE *fp;
+  uint8_t zero = 0;
+
+  if (argc != 3) {
+    fprintf(stderr, "%s: imagefile microdrive.mdr\n", argv[0]);
+    exit(1);
+  }
+  
+  load_filesystem(argv[1]);
+
+  mdv_make_map();
+  fp = fopen(argv[2], "w");
+  if (fp == NULL) {
+    perror(argv[1]);
+    exit(1);
+  }
+  mdv_write_tape(fp);
+  fwrite(&zero, 1, 1, fp);
+  fclose(fp);
+  exit(0);
+}
-- 
2.34.1