wok annotate syslinux/stuff/iso2exe/iso2exe.c @ rev 14266

syslinux/iso2exe: add partition table
author Pascal Bellard <pascal.bellard@slitaz.org>
date Mon Apr 01 17:47:04 2013 +0200 (2013-04-01)
parents bf8be127c60b
children ada914860f33
rev   line source
pascal@14150 1 #include <sys/types.h>
pascal@14150 2 #include <fcntl.h>
pascal@14150 3 #include <stdio.h>
pascal@14150 4 #include "iso2exe.h"
pascal@14150 5
pascal@14150 6 static int fd;
pascal@14264 7 static char tazlitoinfo[10*1024];
pascal@14264 8 #define buffer tazlitoinfo
pascal@14264 9 #define BUFFERSZ 2048
pascal@14150 10
pascal@14150 11 static void quit(char *msg)
pascal@14150 12 {
pascal@14150 13 fprintf(stderr,"%s.\n", msg);
pascal@14150 14 exit(1);
pascal@14150 15 }
pascal@14150 16
pascal@14150 17 static void readsector(unsigned long sector)
pascal@14150 18 {
pascal@14264 19 if (lseek(fd, sector * BUFFERSZ, SEEK_SET) == -1 ||
pascal@14264 20 read(fd, buffer, BUFFERSZ) != BUFFERSZ)
pascal@14150 21 quit("read sector failure");
pascal@14150 22 }
pascal@14150 23
pascal@14150 24 int main(int argc, char *argv[])
pascal@14150 25 {
pascal@14150 26 #define heads 64
pascal@14150 27 #define sectors 32
pascal@14150 28 #define partition 446
pascal@14150 29 #define trksz (512 * heads * sectors)
pascal@14150 30 unsigned long size, catalog, lba;
pascal@14261 31 int cylinders, i, j, isohybrid;
pascal@14150 32 unsigned n;
pascal@14150 33 #ifndef WIN32
pascal@14150 34 char *bootiso;
pascal@14150 35 for (bootiso = (char *) main;
pascal@14150 36 bootiso[0] != 'M' || bootiso[1] != 'Z' || bootiso[2] != 0xEB;
pascal@14150 37 bootiso++) if (bootiso < (char *) main) quit("bootiso not found");
pascal@14150 38 #endif
pascal@14150 39 if (argc < 2)
pascal@14150 40 quit("Usage : isohybrid.exe file.iso");
pascal@14150 41 fd = open(argv[1],O_RDWR|O_BINARY);
pascal@14150 42 if (fd == -1)
pascal@14150 43 quit("Can't open rw");
pascal@14150 44
pascal@14150 45 // Install hybridiso boot sector
pascal@14150 46 readsector(17UL);
pascal@14150 47 if (strncmp(buffer+7, "EL TORITO SPECIFICATION", 23))
pascal@14150 48 quit("No EL TORITO boot record found");
pascal@14150 49 catalog = * (unsigned long *) (buffer + 71);
pascal@14150 50 readsector(catalog);
pascal@14150 51 if (* (unsigned long *) buffer != 1 ||
pascal@14150 52 * (unsigned long *) (buffer + 30) != 0x88AA55)
pascal@14150 53 quit("invalid boot catalog.");
pascal@14150 54 lba = * (unsigned long *) (buffer + 40);
pascal@14150 55 readsector(lba);
pascal@14150 56 if (* (unsigned long *) (buffer + 64) != 1886961915)
pascal@14150 57 quit("no isolinux.bin hybrid signature in bootloader");
pascal@14261 58 isohybrid = bootiso[69] * 512;
pascal@14261 59 * (unsigned long *) &bootiso[isohybrid + 432] = lba * 4;
pascal@14261 60 * (unsigned long *) &bootiso[isohybrid + 440] = rand();
pascal@14261 61 * (unsigned long *) &bootiso[isohybrid + partition] = 0x10080;
pascal@14261 62 * (unsigned short *) &bootiso[isohybrid + 510] = 0xAA55;
pascal@14151 63 size = lseek(fd, 0UL, SEEK_END);
pascal@14150 64 cylinders = (size + trksz - 1) / trksz;
pascal@14261 65 bootiso[isohybrid + partition + 4] = 23; // "Windows hidden IFS"
pascal@14261 66 bootiso[isohybrid + partition + 5] = heads - 1;
pascal@14261 67 bootiso[isohybrid + partition + 6] = (((cylinders - 1) & 0x300) >> 2) + sectors;
pascal@14261 68 bootiso[isohybrid + partition + 7] = (cylinders - 1) & 0xFF;
pascal@14261 69 * (unsigned long *) &bootiso[isohybrid + partition + 8] = 0;
pascal@14261 70 * (unsigned long *) &bootiso[isohybrid + partition + 12] = cylinders * sectors * heads;
pascal@14150 71
pascal@14266 72 // Copy the partition table
pascal@14266 73 memcpy(bootiso + 0x1B8, bootiso + isohybrid + 0x1B8, 0x48);
pascal@14266 74
pascal@14150 75 // Install iso2exe boot sector
pascal@14150 76 * (unsigned short *) (bootiso + 26) = rand();
pascal@14150 77
pascal@14261 78 // read tazlito flavor data
pascal@14261 79 lseek(fd, 1024UL, SEEK_SET);
pascal@14261 80 read(fd, tazlitoinfo, sizeof(tazlitoinfo));
pascal@14261 81
pascal@14150 82 // Update iso image
pascal@14261 83 n = (bootiso[69] + 1) * 512;
pascal@14151 84 lseek(fd, 0UL, SEEK_SET);
pascal@14261 85 write(fd, bootiso, n); // EXE/PE + isohybrid mbr
pascal@14261 86 write(fd, tazlitoinfo, ((0x8000U - BOOTISOSZ) > sizeof(tazlitoinfo))
pascal@14261 87 ? sizeof(tazlitoinfo) : (0x8000U - BOOTISOSZ));
pascal@14261 88 write(fd, bootiso + n, BOOTISOSZ - n); // COM + rootfs + EXE/DOS
pascal@14150 89
pascal@14150 90 // Compute the checksum
pascal@14151 91 lseek(fd, 0UL, SEEK_SET);
pascal@14150 92 for (i = 66, n = 0, j = 0; j < 16; j++, i = 0) {
pascal@14264 93 if (read(fd, buffer, BUFFERSZ) != BUFFERSZ)
pascal@14150 94 goto nochksum;
pascal@14264 95 for (; i < BUFFERSZ; i += 2)
pascal@14150 96 n += * (unsigned short *) (buffer + i);
pascal@14150 97 }
pascal@14150 98 * (unsigned short *) (bootiso + 64) = -n;
pascal@14151 99 lseek(fd, 0UL, SEEK_SET);
pascal@14150 100 write(fd, bootiso, 512);
pascal@14150 101 nochksum:
pascal@14150 102 close(fd);
pascal@14261 103 printf("Note you can create a USB key with %s.\n"
pascal@14261 104 "Simply rename it to a .exe file and run it.\n", argv[1]);
pascal@14150 105 }