wok annotate syslinux/stuff/iso2exe/iso2exe.c @ rev 14268

syslinux/iso2exe: do not overload (setup) version in bootlinux.c
author Pascal Bellard <pascal.bellard@slitaz.org>
date Thu Apr 04 11:19:19 2013 +0200 (2013-04-04)
parents ada914860f33
children 9c889f88b9fd
rev   line source
pascal@14150 1 #include <sys/types.h>
pascal@14150 2 #include <fcntl.h>
pascal@14150 3 #include <stdio.h>
pascal@14268 4 #ifdef WIN32
pascal@14268 5 #include <windows.h>
pascal@14268 6 #endif
pascal@14150 7 #include "iso2exe.h"
pascal@14150 8
pascal@14268 9 static int fd, status = 1;
pascal@14264 10 static char tazlitoinfo[10*1024];
pascal@14264 11 #define buffer tazlitoinfo
pascal@14264 12 #define BUFFERSZ 2048
pascal@14150 13
pascal@14150 14 static void readsector(unsigned long sector)
pascal@14150 15 {
pascal@14264 16 if (lseek(fd, sector * BUFFERSZ, SEEK_SET) == -1 ||
pascal@14268 17 read(fd, buffer, BUFFERSZ) != BUFFERSZ) {
pascal@14268 18 puts("Read sector failure.\n");
pascal@14268 19 exit(1);
pascal@14268 20 }
pascal@14150 21 }
pascal@14150 22
pascal@14268 23 static char *install(char *filename)
pascal@14150 24 {
pascal@14150 25 #define heads 64
pascal@14150 26 #define sectors 32
pascal@14150 27 #define partition 446
pascal@14150 28 #define trksz (512 * heads * sectors)
pascal@14150 29 unsigned long size, catalog, lba;
pascal@14261 30 int cylinders, i, j, isohybrid;
pascal@14150 31 unsigned n;
pascal@14150 32 #ifndef WIN32
pascal@14150 33 char *bootiso;
pascal@14268 34 for (bootiso = (char *) install;
pascal@14150 35 bootiso[0] != 'M' || bootiso[1] != 'Z' || bootiso[2] != 0xEB;
pascal@14268 36 bootiso++) if (bootiso < (char *) install) return "No bootiso data.\n";
pascal@14150 37 #endif
pascal@14268 38 if (!filename)
pascal@14268 39 return "Usage: isohybrid.exe file.iso\n";
pascal@14268 40 fd = open(filename,O_RDWR|O_BINARY);
pascal@14150 41 if (fd == -1)
pascal@14268 42 return "Can't open rw the iso file.\n";
pascal@14150 43
pascal@14150 44 // Install hybridiso boot sector
pascal@14150 45 readsector(17UL);
pascal@14150 46 if (strncmp(buffer+7, "EL TORITO SPECIFICATION", 23))
pascal@14268 47 return "No EL TORITO signature.\n";
pascal@14150 48 catalog = * (unsigned long *) (buffer + 71);
pascal@14150 49 readsector(catalog);
pascal@14150 50 if (* (unsigned long *) buffer != 1 ||
pascal@14150 51 * (unsigned long *) (buffer + 30) != 0x88AA55)
pascal@14268 52 return "Invalid boot catalog.\n";
pascal@14150 53 lba = * (unsigned long *) (buffer + 40);
pascal@14150 54 readsector(lba);
pascal@14150 55 if (* (unsigned long *) (buffer + 64) != 1886961915)
pascal@14268 56 return "No isolinux.bin hybrid signature.\n";
pascal@14261 57 isohybrid = bootiso[69] * 512;
pascal@14261 58 * (unsigned long *) &bootiso[isohybrid + 432] = lba * 4;
pascal@14261 59 * (unsigned long *) &bootiso[isohybrid + 440] = rand();
pascal@14261 60 * (unsigned long *) &bootiso[isohybrid + partition] = 0x10080;
pascal@14261 61 * (unsigned short *) &bootiso[isohybrid + 510] = 0xAA55;
pascal@14151 62 size = lseek(fd, 0UL, SEEK_END);
pascal@14150 63 cylinders = (size + trksz - 1) / trksz;
pascal@14261 64 bootiso[isohybrid + partition + 4] = 23; // "Windows hidden IFS"
pascal@14261 65 bootiso[isohybrid + partition + 5] = heads - 1;
pascal@14261 66 bootiso[isohybrid + partition + 6] = (((cylinders - 1) & 0x300) >> 2) + sectors;
pascal@14261 67 bootiso[isohybrid + partition + 7] = (cylinders - 1) & 0xFF;
pascal@14261 68 * (unsigned long *) &bootiso[isohybrid + partition + 8] = 0;
pascal@14261 69 * (unsigned long *) &bootiso[isohybrid + partition + 12] = cylinders * sectors * heads;
pascal@14150 70
pascal@14266 71 // Copy the partition table
pascal@14267 72 memcpy(bootiso + 0x1BE, bootiso + isohybrid + 0x1BE, 66);
pascal@14266 73
pascal@14150 74 // Install iso2exe boot sector
pascal@14150 75 * (unsigned short *) (bootiso + 26) = rand();
pascal@14150 76
pascal@14261 77 // read tazlito flavor data
pascal@14261 78 lseek(fd, 1024UL, SEEK_SET);
pascal@14261 79 read(fd, tazlitoinfo, sizeof(tazlitoinfo));
pascal@14261 80
pascal@14150 81 // Update iso image
pascal@14261 82 n = (bootiso[69] + 1) * 512;
pascal@14151 83 lseek(fd, 0UL, SEEK_SET);
pascal@14261 84 write(fd, bootiso, n); // EXE/PE + isohybrid mbr
pascal@14261 85 write(fd, tazlitoinfo, ((0x8000U - BOOTISOSZ) > sizeof(tazlitoinfo))
pascal@14261 86 ? sizeof(tazlitoinfo) : (0x8000U - BOOTISOSZ));
pascal@14261 87 write(fd, bootiso + n, BOOTISOSZ - n); // COM + rootfs + EXE/DOS
pascal@14150 88
pascal@14150 89 // Compute the checksum
pascal@14151 90 lseek(fd, 0UL, SEEK_SET);
pascal@14150 91 for (i = 66, n = 0, j = 0; j < 16; j++, i = 0) {
pascal@14264 92 if (read(fd, buffer, BUFFERSZ) != BUFFERSZ)
pascal@14150 93 goto nochksum;
pascal@14264 94 for (; i < BUFFERSZ; i += 2)
pascal@14150 95 n += * (unsigned short *) (buffer + i);
pascal@14150 96 }
pascal@14150 97 * (unsigned short *) (bootiso + 64) = -n;
pascal@14151 98 lseek(fd, 0UL, SEEK_SET);
pascal@14150 99 write(fd, bootiso, 512);
pascal@14150 100 nochksum:
pascal@14150 101 close(fd);
pascal@14268 102 status = 0;
pascal@14268 103 return "Now you can create a USB key with your .iso file.\n"
pascal@14268 104 "Simply rename it to a .exe file and run it.\n";
pascal@14150 105 }
pascal@14268 106
pascal@14268 107 int main(int argc, char *argv[])
pascal@14268 108 {
pascal@14268 109 puts(install(argv[1]));
pascal@14268 110 #ifdef WIN32
pascal@14268 111 Sleep(2000);
pascal@14268 112 #endif
pascal@14268 113 return status;
pascal@14268 114 }