> < > DISK1 » a Name Date Modified Size .fseventsd ATTRIB.EXE AUTOEXEC.BAT CHKDSK.EXE COMMAND.COM CONFIG.SYS COUNTRY.SYS COUNTRY.TX DEBUG.EXE DEFRAG.EXE DEFRAG.HL DOSSETUP.INI DRVSPACE.BIN Yesterday at 7:37 PM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM 37 1 5 13 EDIT.COM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM 2 1 7 6 413 EGA.CP_ May 31, 1994 at 6:22 AM 1 EGA2.CP May 31, 1994 at 6:22 AM 1 EGA3.CP_ May 31, 1994 at 6:22 AM 1 EMM386.EX May 31, 1994 at 6:22 AM 5 EXPAND.EXE FDISK.EXE FORMAT.COM May 31, 1994 at 6:22 AM 1 May 31, 1994 at 6:22 AM 2 May 31, 1994 at 6:22 AM 2 IO.SYS May 31, 1994 at 6:22 AM 4 < > > V3 + KEYB.COM ISO.CP_ May 31, 1994 at 6:22 AM 1 May 31, 1994 at 6:22 AM 1 KEYBOARD.SYS May 31, 1994 at 6:22 AM 3 Name DISK1 disk1.img extract_file extract_file.c PACKING.LST QBASIC.EXE iCloud Drive > Desktop KEYBRD2.SY_ MEM.EX MSCDEX.EXE MSDOS.SYS NETWORKS.TXT May 31, 1994 at 6:22 AM 1 May 31, 1994 at 6:22 AM 2 May 31, 1994 at 6:22 AM 2 May 31, 1994 at 6:22 AM 3 May 31, 1994 at 6:22 AM 1 NLSFUNC.EXE May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM V3 > May 31, 1994 at 6:22 AM DISK1 19 MacBook Pro 74 75 76 77 78 dir_entry_t✶ getRootDirEntries (FILE *disk, boot_t * 79 } 80 uint16_t rootDirSectors ((bootSector->root_di uint8_t *buffer = (uint8_t *)malloc(rootDirSect readSector (disk, bootSector->reserved_sectors + return (dir_entry_t *) buffer; dir_entry_t* find Root DirEntry(const char *filename, for (int i = 0; i < numEntries; i++) { if (strncmp(entries [i].filename, filename, return &entries [i]; 81 82 83 84 85 } 86 } 87 return NULL; 88 } 89 90 PROBLEMS void readCluster(FILE *disk. uint32 t clusterNumber. OUTPUT DEBUG CONSOLE TERMINAL PORTS End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reache^C }

> < > DISK1 » a Name Date Modified Size .fseventsd ATTRIB.EXE AUTOEXEC.BAT CHKDSK.EXE COMMAND.COM CONFIG.SYS COUNTRY.SYS COUNTRY.TX DEBUG.EXE DEFRAG.EXE DEFRAG.HL DOSSETUP.INI DRVSPACE.BIN Yesterday at 7:37 PM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM 37 1 5 13 EDIT.COM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM 2 1 7 6 413 EGA.CP_ May 31, 1994 at 6:22 AM 1 EGA2.CP May 31, 1994 at 6:22 AM 1 EGA3.CP_ May 31, 1994 at 6:22 AM 1 EMM386.EX May 31, 1994 at 6:22 AM 5 EXPAND.EXE FDISK.EXE FORMAT.COM May 31, 1994 at 6:22 AM 1 May 31, 1994 at 6:22 AM 2 May 31, 1994 at 6:22 AM 2 IO.SYS May 31, 1994 at 6:22 AM 4 < > > V3 + KEYB.COM ISO.CP_ May 31, 1994 at 6:22 AM 1 May 31, 1994 at 6:22 AM 1 KEYBOARD.SYS May 31, 1994 at 6:22 AM 3 Name DISK1 disk1.img extract_file extract_file.c PACKING.LST QBASIC.EXE iCloud Drive > Desktop KEYBRD2.SY_ MEM.EX MSCDEX.EXE MSDOS.SYS NETWORKS.TXT May 31, 1994 at 6:22 AM 1 May 31, 1994 at 6:22 AM 2 May 31, 1994 at 6:22 AM 2 May 31, 1994 at 6:22 AM 3 May 31, 1994 at 6:22 AM 1 NLSFUNC.EXE May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM V3 > May 31, 1994 at 6:22 AM DISK1 19 MacBook Pro 74 75 76 77 78 dir_entry_t✶ getRootDirEntries (FILE disk, boot_t 79 } 80 uint16_t rootDirSectors ((bootSector->root_di uint8_t buffer = (uint8_t )malloc(rootDirSect readSector (disk, bootSector->reserved_sectors + return (dir_entry_t ) buffer; dir_entry_t find Root DirEntry(const char filename, for (int i = 0; i < numEntries; i++) { if (strncmp(entries [i].filename, filename, return &entries [i]; 81 82 83 84 85 } 86 } 87 return NULL; 88 } 89 90 PROBLEMS void readCluster(FILE disk. uint32 t clusterNumber. OUTPUT DEBUG CONSOLE TERMINAL PORTS End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reached unexpectedly. End of file reache^C }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Related questions

Question

code is still giving me this error when i already asked on here and had it troubleshooted. Please help i need this program to work. Where I can extract any file in the disk img for example ./extract_file disk1.img CONFIG.SYS #include #include #include #include #pragma pack(push, 1) typedef struct { int8_tjump_to_bootstrap[3]; int8_toem_id[8]; uint16_tbytes_per_sector; uint8_tsectors_per_cluster; uint16_treserved_sectors; uint8_tfat_copies; uint16_troot_dir_entries; uint16_ttotal_sectors; uint8_tmedia_descriptor_type; uint16_tsectors_per_fat; uint16_tsectors_per_track; uint16_theads; uint32_thidden_sectors; uint32_ttotal_sectors2; uint8_tdrive_index; uint8_t_stuff; uint8_tsignature; uint32_tid; int8_tlabel[11]; int8_ttype[8]; int8_t_more_stuff[448]; uint16_tsig; } boot_t; typedef struct { int8_tfilename[8]; int8_textension[3]; int8_tattributes; int8_t_reserved[10]; uint16_tupdate_time; uint16_tupdate_date; uint16_tstarting_cluster; uint32_tfile_size; } dir_entry_t; #pragma pack(pop) void readSector(FILE *disk, uint32_t sectorNumber, uint8_t *buffer, uint16_t bytesPerSector) { if (disk==NULL) { fprintf(stderr, "Invalid file pointer.\n"); return; } if (buffer==NULL) { fprintf(stderr, "Invalid buffer pointer.\n"); return; } if (fseek(disk, sectorNumber*bytesPerSector, SEEK_SET) !=0) { perror("Error seeking file"); return; } size_tbytesRead=fread(buffer, 1, bytesPerSector, disk); if (bytesRead!=bytesPerSector) { if (feof(disk)) { fprintf(stderr, "End of file reached unexpectedly.\n"); } else if (ferror(disk)) { perror("Error reading file"); } return; } } void readMBR(FILE *disk, boot_t *bootSector) { uint8_tbuffer[512]; readSector(disk, 0, buffer, 512); memcpy(bootSector, buffer, sizeof(boot_t)); } dir_entry_t* getRootDirEntries(FILE *disk, boot_t *bootSector) { uint16_trootDirSectors= ((bootSector->root_dir_entries*32) + (bootSector->bytes_per_sector-1)) /bootSector->bytes_per_sector; uint8_t*buffer= (uint8_t*)malloc(rootDirSectors*bootSector->bytes_per_sector); readSector(disk, bootSector->reserved_sectors+ (bootSector->fat_copies*bootSector->sectors_per_fat), buffer, rootDirSectors*bootSector->bytes_per_sector); return (dir_entry_t*)buffer; } dir_entry_t* findRootDirEntry(const char *filename, dir_entry_t *entries, uint16_t numEntries) { for (inti=0; ireserved_sectors+ (bootSector->fat_copies*bootSector->sectors_per_fat) + ((bootSector->root_dir_entries*32+bootSector->bytes_per_sector-1) /bootSector->bytes_per_sector); uint32_tfirstSectorOfCluster= ((clusterNumber-2) *bootSector->sectors_per_cluster) +firstDataSector; for (inti=0; isectors_per_cluster; i++) { readSector(disk, firstSectorOfCluster+i, buffer+ (i*bootSector->bytes_per_sector), bootSector->bytes_per_sector); } } void extractFile(FILE *disk, dir_entry_t *entry, boot_t *bootSector) { uint8_t*buffer= (uint8_t*)malloc(entry->file_size); uint32_tcluster=entry->starting_cluster; uint32_tbytesRead=0; while (bytesReadfile_size) { readCluster(disk, cluster, buffer+bytesRead, bootSector); bytesRead+=bootSector->bytes_per_sector*bootSector->sectors_per_cluster; cluster++; } FILE*output=fopen("output_file", "wb"); fwrite(buffer, 1, entry->file_size, output); fclose(output); free(buffer); } int main(int argc, char *argv[]) { if (argc!=3) { fprintf(stderr, "Usage: %s \n", argv[0]); return1; } constchar*diskImage=argv[1]; constchar*filename=argv[2]; FILE*disk=fopen(diskImage, "rb"); if (disk==NULL) { perror("Error opening disk image"); return1; } boot_tbootSector; readMBR(disk, &bootSector); dir_entry_t*entries=getRootDirEntries(disk, &bootSector); dir_entry_t*entry=findRootDirEntry(filename, entries, bootSector.root_dir_entries); if (entry) { extractFile(disk, entry, &bootSector); printf("File extracted successfully.\n"); } else { fprintf(stderr, "File not found in root directory.\n"); } free(entries); fclose(disk); return0; }

>
< > DISK1
» a
Name
Date Modified
Size
.fseventsd
ATTRIB.EXE
AUTOEXEC.BAT
CHKDSK.EXE
COMMAND.COM
CONFIG.SYS
COUNTRY.SYS
COUNTRY.TX
DEBUG.EXE
DEFRAG.EXE
DEFRAG.HL
DOSSETUP.INI
DRVSPACE.BIN
Yesterday at 7:37 PM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
37
1
5
13
EDIT.COM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
2
1
7
6
413
EGA.CP_
May 31, 1994 at 6:22 AM
1
EGA2.CP
May 31, 1994 at 6:22 AM
1
EGA3.CP_
May 31, 1994 at 6:22 AM
1
EMM386.EX
May 31, 1994 at 6:22 AM
5
EXPAND.EXE
FDISK.EXE
FORMAT.COM
May 31, 1994 at 6:22 AM
1
May 31, 1994 at 6:22 AM
2
May 31, 1994 at 6:22 AM
2
IO.SYS
May 31, 1994 at 6:22 AM
4
< > > V3
+
KEYB.COM
ISO.CP_
May 31, 1994 at 6:22 AM
1
May 31, 1994 at 6:22 AM
1
KEYBOARD.SYS
May 31, 1994 at 6:22 AM
3
Name
DISK1
disk1.img
extract_file
extract_file.c
PACKING.LST
QBASIC.EXE
iCloud Drive > Desktop
KEYBRD2.SY_
MEM.EX
MSCDEX.EXE
MSDOS.SYS
NETWORKS.TXT
May 31, 1994 at 6:22 AM
1
May 31, 1994 at 6:22 AM
2
May 31, 1994 at 6:22 AM
2
May 31, 1994 at 6:22 AM
3
May 31, 1994 at 6:22 AM
1
NLSFUNC.EXE
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
V3 >
May 31, 1994 at 6:22 AM
DISK1
19
MacBook Pro

74 75 76
77
78
dir_entry_t✶ getRootDirEntries (FILE *disk, boot_t *
79
}
80
uint16_t rootDirSectors ((bootSector->root_di
uint8_t *buffer = (uint8_t *)malloc(rootDirSect
readSector (disk, bootSector->reserved_sectors +
return (dir_entry_t *) buffer;
dir_entry_t* find Root DirEntry(const char *filename,
for (int i = 0; i < numEntries; i++) {
if (strncmp(entries [i].filename, filename,
return &entries [i];
81
82
83
84
85
}
86
}
87
return NULL;
88
}
89
90
PROBLEMS
void readCluster(FILE *disk. uint32 t clusterNumber.
OUTPUT DEBUG CONSOLE TERMINAL PORTS
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reached unexpectedly.
End of file reache^C
}

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