auto-umount those annoying Mac OSX partitions

1 files changed, 232 insertions, 0 deletions

diff --git a/package/adk-helper/src/ptgen.c b/package/adk-helper/src/ptgen.c
new file mode 100644
index 000000000..f91aac84f
--- /dev/null
+++ b/package/adk-helper/src/ptgen.c
@@ -0,0 +1,232 @@
+/* 
+ * ptgen - partition table generator
+ * Copyright (C) 2006 by Felix Fietkau <nbd@openwrt.org>
+ *
+ * uses parts of afdisk
+ * Copyright (C) 2002 by David Roetzel <david@roetzel.de>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <fcntl.h>
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define cpu_to_le16(x) ((((x) & 0xff) << 8) | ((x) >> 8))
+#elif __BYTE_ORDER == __LITTLE_ENDIAN
+#define cpu_to_le16(x) (x)
+#else
+#error unknown endianness!
+#endif
+
+/* Partition table entry */
+struct pte { 
+	unsigned char active;
+	unsigned char chs_start[3];
+	unsigned char type;
+	unsigned char chs_end[3];
+	unsigned int start;
+	unsigned int length;
+};
+
+struct partinfo {
+	unsigned long size;
+	int type;
+};
+
+int verbose = 0;
+int active = 1;
+int heads = -1;
+int sectors = -1;
+int kb_align = 0;
+struct partinfo parts[4];
+char *filename = NULL;
+
+
+/* 
+ * parse the size argument, which is either
+ * a simple number (K assumed) or
+ * K, M or G
+ *
+ * returns the size in KByte
+ */
+static long to_kbytes(const char *string) {
+	int exp = 0;
+	long result;
+	char *end;
+
+	result = strtoul(string, &end, 0);
+	switch (tolower(*end)) {
+			case 'k' :
+			case '\0' : exp = 0; break;
+			case 'm' : exp = 1; break;
+			case 'g' : exp = 2; break;
+			default: return 0;
+	}
+
+	if (*end)
+		end++;
+
+	if (*end) {
+		fprintf(stderr, "garbage after end of number\n");
+		return 0;
+	}
+
+	/* result: number + 1024^(exp) */
+	return result * ((2 << ((10 * exp) - 1)) ?: 1);
+}
+
+/* convert the sector number into a CHS value for the partition table */
+static void to_chs(long sect, unsigned char chs[3]) {
+	int c,h,s;
+	
+	s = (sect % sectors) + 1;
+	sect = sect / sectors;
+	h = sect % heads;
+	sect = sect / heads;
+	c = sect;
+
+	chs[0] = h;
+	chs[1] = s | ((c >> 2) & 0xC0);
+	chs[2] = c & 0xFF;
+
+	return;
+}
+
+/* round the sector number up to the next cylinder */
+static inline unsigned long round_to_cyl(long sect) {
+	int cyl_size = heads * sectors;
+
+	return sect + cyl_size - (sect % cyl_size); 
+}
+
+/* round the sector number up to the kb_align boundary */
+static inline unsigned long round_to_kb(long sect) {
+        return ((sect - 1) / kb_align + 1) * kb_align;
+}
+
+/* check the partition sizes and write the partition table */
+static int gen_ptable(int nr)
+{
+	struct pte pte[4];
+	unsigned long sect = 0; 
+	int i, fd, ret = -1, start, len;
+
+	memset(pte, 0, sizeof(struct pte) * 4);
+	for (i = 0; i < nr; i++) {
+		if (!parts[i].size) {
+			fprintf(stderr, "Invalid size in partition %d!\n", i);
+			return -1;
+		}
+		pte[i].active = ((i + 1) == active) ? 0x80 : 0;
+		pte[i].type = parts[i].type;
+		start = sect + sectors;
+		if (kb_align != 0)
+			start = round_to_kb(start);
+		pte[i].start = cpu_to_le16(start);
+		sect = start + parts[i].size * 2;
+		if (kb_align == 0)
+			sect = round_to_cyl(sect);
+		pte[i].length = cpu_to_le16(len = sect - start);
+		to_chs(start, pte[i].chs_start);
+		to_chs(start + len - 1, pte[i].chs_end);
+		if (verbose)
+			fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n", i, (long) start * 512, ((long) start + (long) len) * 512, (long) len * 512);
+	}
+
+	if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
+		fprintf(stderr, "Can't open output file '%s'\n",filename);
+		return -1;
+	}
+
+	lseek(fd, 446, SEEK_SET);
+	if (write(fd, pte, sizeof(struct pte) * 4) != sizeof(struct pte) * 4) {
+		fprintf(stderr, "write failed.\n");
+		goto fail;
+	}
+	lseek(fd, 510, SEEK_SET);
+	if (write(fd, "\x55\xaa", 2) != 2) {
+		fprintf(stderr, "write failed.\n");
+		goto fail;
+	}
+	
+	ret = 0;
+fail:
+	close(fd);
+	return ret;
+}
+
+static void usage(char *prog)
+{
+	fprintf(stderr,	"Usage: %s [-v] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [[-t <type>] -p <size>...] \n", prog);
+	exit(1);
+}
+
+int main (int argc, char **argv)
+{
+	char type = 0x83;
+	int ch;
+	int part = 0;
+
+	while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vl:")) != -1) {
+		switch (ch) {
+		case 'o':
+			filename = optarg;
+			break;
+		case 'v':
+			verbose++;
+			break;
+		case 'h':
+			heads = (int) strtoul(optarg, NULL, 0);
+			break;
+		case 's':
+			sectors = (int) strtoul(optarg, NULL, 0);
+			break;
+		case 'p':
+			if (part > 3) {
+				fprintf(stderr, "Too many partitions\n");
+				exit(1);
+			}
+			parts[part].size = to_kbytes(optarg);
+			parts[part++].type = type;
+			break;
+		case 't':
+			type = (char) strtoul(optarg, NULL, 16);
+			break;
+		case 'a':
+			active = (int) strtoul(optarg, NULL, 0);
+			if ((active < 0) || (active > 4))
+				active = 0;
+			break;
+		case 'l':
+			kb_align = (int) strtoul(optarg, NULL, 0) * 2;
+			break;
+		case '?':
+		default:
+			usage(argv[0]);
+		}
+	}
+	argc -= optind;
+	if (argc || (heads <= 0) || (sectors <= 0) || !filename) 
+		usage(argv[0]);
+	
+	return gen_ptable(part);
+}