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