-

Ocean_240/utils/decode_ocean_floppy/.clang-format

@@ -0,0 +1,168 @@
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+

Ocean_240/utils/decode_ocean_floppy/Makefile

@@ -0,0 +1,15 @@
+all: decode_ocean_floppy decode_ocean_floppy.exe
+
+.PHONY: clean
+clean:
+
+.PHONY: format
+format:
+	clang-format -i decode_ocean_floppy.c
+
+decode_ocean_floppy.exe: decode_ocean_floppy.c
+	x86_64-w64-mingw32-g++ -O2 -static --std=c++17 -o$@ $<
+
+decode_ocean_floppy: decode_ocean_floppy.c
+	g++ -g -static --std=c++17 -o$@ $<
+

Ocean_240/utils/decode_ocean_floppy/decode_ocean_floppy.c

@@ -0,0 +1,82 @@
+/* Convert Ocean 240 floppy images to normal format
+ * Copyright (c) 2024 Aleksey Morozov [email protected] [email protected]
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <errno.h>
+
+static const unsigned interleave[] = {1, 8, 6, 4, 2, 9, 7, 5, 3};
+
+int main(int argc, char **argv) {
+    if (argc != 3) {
+        fprintf(stderr,
+                "Convert Ocean 240 floppy images to normal format\n"
+                "Usage: %s to.imd from.img\n",
+                argv[0]);
+        return 1;
+    }
+
+    int fd = open(argv[2], O_RDONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Can't open file %s, errno %i\n", argv[2], errno);
+        return 1;
+    }
+
+    int fd2 = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
+    if (fd2 == -1) {
+        fprintf(stderr, "Can't create file %s, errno %i\n", argv[1], errno);
+        close(fd);
+        return 1;
+    }
+
+    for (unsigned side = 0; side < 2; side++) {
+        for (unsigned track = 0; track < 80; track++) {
+            for (unsigned sector = 0; sector < 9; sector++) {
+                const unsigned offset = (track * 18 + side * 9 + interleave[sector] - 1) * 512;
+                if (lseek(fd, offset, SEEK_SET) != offset) {
+                    fprintf(stderr, "Can't seek file %s, errno %i\n", argv[2], errno);
+                    close(fd);
+                    close(fd2);
+                    return 1;
+                }
+
+                char buf[512];
+                if (read(fd, buf, 512) != 512) {
+                    fprintf(stderr, "Can't read file %s, errno %i\n", argv[2], errno);
+                    close(fd);
+                    close(fd2);
+                    return 1;
+                }
+
+                if (write(fd2, buf, 512) != 512) {
+                    fprintf(stderr, "Can't write file %s, errno %i\n", argv[1], errno);
+                    close(fd);
+                    close(fd2);
+                    return 1;
+                }
+            }
+        }
+    }
+
+    printf("Done\n");
+
+    close(fd);
+    close(fd2);
+
+    return 0;
+}