treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / tools / firmware-utils / src / ptgen.c
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/* 
 * 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 <stdint.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdint.h>
 
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_le32(x) bswap_32(x)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define cpu_to_le32(x) (x)
#else
#error unknown endianness!
#endif
 
/* Partition table entry */
struct pte {
        uint8_t active;
        uint8_t chs_start[3];
        uint8_t type;
        uint8_t chs_end[3];
        uint32_t start;
        uint32_t 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(uint32_t signature, 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_le32(start);
                sect = start + parts[i].size * 2;
                if (kb_align == 0)
                        sect = round_to_cyl(sect);
                pte[i].length = cpu_to_le32(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);
                printf("%ld\n", ((long) start * 512));
                printf("%ld\n", ((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, 440, SEEK_SET);
        if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
                fprintf(stderr, "write failed.\n");
                goto fail;
        }
 
        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;
        uint32_t signature = 0x5452574F; /* 'OWRT' */
 
        while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vl:S:")) != -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 'S':
                        signature = strtoul(optarg, NULL, 0);
                        break;
                case '?':
                default:
                        usage(argv[0]);
                }
        }
        argc -= optind;
        if (argc || (heads <= 0) || (sectors <= 0) || !filename) 
                usage(argv[0]);
 
        return gen_ptable(signature, part);
}
 
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