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 Name .fseventsd ATTRIB.EXE Date Modified Yesterday at 7:37 PM May 31, 1994 at 6:22 AM » Q Size 1 AUTOEXEC.BAT CHKDSK.EXE COMMAND.COM CONFIG.SYS COUNTRY.SYS COUNTRY.TX_ DEBUG.EXE 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 40 37 1 5 13 May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM May 31, 1994 at 6:22 AM 2 1 DEFRAG.EXE May 31, 1994 at 6:22 AM 7 DEFRAG.HL DOSSETUP.INI DRVSPACE.BIN EDIT.COM EGA.CP_ EGA2.CP_ 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 6 413 1 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 IO.SYS 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 4 < > ISO.CP_ May 31, 1994 at 6:22 AM 1 V3 KEYB.COM May 31, 1994 at 6:22 AM 1 KEYBOARD.SYS May 31, 1994 at 6:22 AM 3 KEYBRD2.SY_ May 31, 1994 at 6:22 AM 1 Name DISK1 disk1.img extract_file extract_file.c MEM.EX_ May 31, 1994 at 6:22 AM 2 MSCDEX.EXE MSDOS.SYS NETWORKS.TXT 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 PACKING.LST May 31, 1994 at 6:22 AM QBASIC.EXE iCloud Drive > Desktop > May 31, 1994 at 6:22 AM V3> DISK1 19

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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Question

now when i compile and run, im getting this error and it prints it endlessly "End of file reached unexpectedly." PLease help to solve this so that i can run ./extract_file disk1.img CONFIG.SYS and get the extracted file. #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; // In a real implementation, follow the FAT to find the next 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; }

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
Name
.fseventsd
ATTRIB.EXE
Date Modified
Yesterday at 7:37 PM
May 31, 1994 at 6:22 AM
» Q
Size
1
AUTOEXEC.BAT
CHKDSK.EXE
COMMAND.COM
CONFIG.SYS
COUNTRY.SYS
COUNTRY.TX_
DEBUG.EXE
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
40
37
1
5
13
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
May 31, 1994 at 6:22 AM
2
1
DEFRAG.EXE
May 31, 1994 at 6:22 AM
7
DEFRAG.HL
DOSSETUP.INI
DRVSPACE.BIN
EDIT.COM
EGA.CP_
EGA2.CP_
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
6
413
1
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
IO.SYS
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
4
< >
ISO.CP_
May 31, 1994 at 6:22 AM
1
V3
KEYB.COM
May 31, 1994 at 6:22 AM
1
KEYBOARD.SYS
May 31, 1994 at 6:22 AM
3
KEYBRD2.SY_
May 31, 1994 at 6:22 AM
1
Name
DISK1
disk1.img
extract_file
extract_file.c
MEM.EX_
May 31, 1994 at 6:22 AM
2
MSCDEX.EXE
MSDOS.SYS
NETWORKS.TXT
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
PACKING.LST
May 31, 1994 at 6:22 AM
QBASIC.EXE
iCloud Drive >
Desktop >
May 31, 1994 at 6:22 AM
V3> DISK1
19

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