865 lines
21 KiB
C
865 lines
21 KiB
C
/*
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* isoread.c
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*
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* isoread reads a file system in ISO9660 or HIGH SIERRA format from
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* a given device.
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*
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* Apr 5 1995 Michel R. Prevenier
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* Nov 16 1996 Kees J. Bot -- bug fix: isoread filename matching
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* Dec 7 1997 Albert S. Woodhull -- bug fix: return values
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* " " : isodir filename handling
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* -- added : isoread -a option
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* Mar 21 2000 Michael A. Temari -- bug fix: look_up only searched first
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* : block of directory
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* : stack overflow in recurse_dir
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* : and various other bugs
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* Apr 14 2002 Michael A. Temari -- bug fix: fixed recursing directories
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* : and printing dates 2000 and
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* : later
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* May 14 2002 Kees J. Bot -- bug fix: fixed error messages
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* Mar 14 2003 Kees J. Bot -- added : iso{dir,read} -B option
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* Jul 24 2003 Michael A. Temari -- bug fix: bytes to blocks roundup fix
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <sys/times.h>
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#include <unistd.h>
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/*
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* definitions used by the ISO9660 and HIGH SIERRA file system
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*/
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#define ISO9660_ID "CD001"
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#define HIGH_SIERRA_ID "CDROM"
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#define BLOCK_SIZE 2048
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#define BLOCK_SHIFT 11
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/* Fields in a ISO9660 volume descriptor */
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struct iso9660_descriptor
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{
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char type[1];
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char id[5];
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char version[1];
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char reserved1[1];
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char system_id[32];
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char volume_id[32];
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char reserved2[8];
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char volume_size[8];
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char reserved3[32];
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char volume_set_size[4];
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char volume_seq_nr[4];
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char block_size[4];
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char path_table_size[8];
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char type_l_path_table[4];
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char opt_type_l_path_table[4];
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char type_m_path_table[4];
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char opt_type_m_path_table[4];
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char root_dir_entry[34];
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char vol_set_id[128];
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char publ_id[128];
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char prep_id[128];
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char appl_id[128];
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char copyright_file_id[37];
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char abstract_file_id[37];
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char bibl_file_id[37];
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char creation_date[17];
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char mod_date[17];
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char exp_date[17];
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char eff_date[17];
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char file_struc_version[1];
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char reserved4[1];
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char appl_data[512];
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char reserved5[653];
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};
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/* Fields in a High Sierra volume descriptor */
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struct high_sierra_descriptor
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{
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char reserved1[8];
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char type[1];
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char id[5];
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char version[1];
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char reserved2[1];
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char system_id[32];
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char volume_id[32];
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char reserved3[8];
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char volume_size[8];
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char reserved4[32];
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char vol_set_size[4];
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char volume_seq_nr[4];
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char block_size[4];
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char path_table_size[8];
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char type_l_path_table[4];
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char reserved5[28];
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char root_dir_entry[34];
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};
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/* Fields in a directory entry */
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struct dir_entry
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{
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char length[1];
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char ext_attr_length[1];
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char first_block[8];
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char size[8];
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char date[7];
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char flags[1];
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char file_unit_size[1];
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char interleave[1];
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char volume_seq_nr[4];
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char name_length[1];
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char name[1];
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};
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#define STDOUT stdout
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#define STDERR stderr
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#define NULL_DIR (struct dir_entry *) 0
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#define MAX_NAME_LENGTH 255
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#define MAX_PATH_LENGTH 1024
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#define NR_OF_CHARS 13
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#define NR_OF_BLANKS 2
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#define NR_OF_COLS (80 / (NR_OF_CHARS + NR_OF_BLANKS))
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/* This macro always returns a lower case character */
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#define LOWER_CASE(CHR) (CHR >= 'A' && CHR <= 'Z' ? CHR | 0x20 : CHR)
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/* Macro's for determining . , .. and normal directory entries */
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#define IS_DOT(PTR) (PTR->name_length[0] == 1 && PTR->name[0] == 0 ? 1 : 0)
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#define IS_DOT_DOT(PTR) (PTR->name_length[0] == 1 && PTR->name[0] == 1 ? 1 : 0)
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#define IS_DIR(PTR) (PTR->flags[-High_Sierra] & 2 ? 1 : 0)
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int main(int argc, char **argv);
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int iso_cmp(char *name, struct dir_entry *dir_ptr, int dir_flag);
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void list_dir(struct dir_entry *dir_ptr);
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void list_file(struct dir_entry *dir_ptr);
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struct dir_entry *look_up(char *name);
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void recurse_dir(char *path, struct dir_entry *dir_ptr);
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void read_device(long offset, int nr_of_bytes, char *buffer);
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int valid_fs(void);
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void usage(void);
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void print_date(char *date);
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void print_dir_date(char *date);
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void iso_info(struct iso9660_descriptor *vol_desc);
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void hs_info(struct high_sierra_descriptor *vol_desc);
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int iso_711(char *c);
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int iso_712(char *c);
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int iso_721(char *c);
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int iso_722(char *c);
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int iso_723(char *c);
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long iso_731(char *c);
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long iso_732(char *c);
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long iso_733(char *c);
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char Buffer[BLOCK_SIZE]; /* buffer to hold read data */
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int Device; /* global file descriptor */
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struct iso9660_descriptor *Iso_Vol_Desc; /* iso9660 volume descriptor */
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struct high_sierra_descriptor *Hs_Vol_Desc; /* high sierra volume descriptor */
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int High_Sierra = 0; /* 1 = high sierra format */
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int Iso9660 = 0; /* 1 = iso9660 format */
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/* This comes in handy when printing the date */
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char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
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/* Flags displaying what to do */
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int Read_File = 0; /* 1 = Read file */
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int Read_Dir = 0; /* 1 = Read directory entry */
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int Read_Info = 0; /* 1 = Read volume descriptor */
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int Recurse = 0; /* 1 = Recursively descend directories */
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int Verbose = 0; /* 1 = Print all info on directories */
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int ByteOffset = 0; /* 1 = Print byte offset and length of files */
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int Aflag = 0; /* 1 = Suppress output of \r */
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int iso_cmp(name, dir_ptr, dir_flag)
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char *name;
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struct dir_entry *dir_ptr;
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int dir_flag;
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{
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/* Compare name with directory entries, looking for match with a dirname.
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* An iso9660 filename is terminated by ";n", where n will probably
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* be 1. A directory name is not terminated by anything special, it may be
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* followed by a \0 if padding is needed to put the following directory
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* entry on an even address.
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*/
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int i;
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int len;
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/* First match the filename */
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len = strlen(name);
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if (len > iso_711(dir_ptr->name_length)) return 1;
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for (i = 0; i < len; i++)
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{
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if (dir_ptr->name[i] == ';') return 1; /* found end of a filename */
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if (name[i] != LOWER_CASE(dir_ptr->name[i])) return 1; /* match failed */
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}
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if (dir_ptr->name[i] != ';' && i != len) return 1; /* incomplete match */
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/* The filename is ok, now look at the file type */
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if (dir_flag && !IS_DIR(dir_ptr)) return 1; /* File type not correct */
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return 0;
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}
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void usage()
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{
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if (Read_Dir)
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fprintf (STDERR, "Usage: isodir [-lrB] inputfile [dir]\n");
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else if (Read_Info)
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fprintf (STDERR, "Usage: isoinfo inputfile\n");
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else
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fprintf (STDERR, "Usage: isoread [-a] inputfile file\n");
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exit(1);
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}
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int main(argc, argv)
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int argc;
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char **argv;
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{
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struct dir_entry *entry;
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char path[MAX_PATH_LENGTH];
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char *input_file;
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char *basename;
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char *file_name;
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int i,j;
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/* Read arguments */
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basename = argv[0];
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while (*argv[0] != '\0')
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if (*argv[0]++ == '/') basename = argv[0];
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if (strcmp(basename,"isodir") == 0) Read_Dir = 1;
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else if (strcmp(basename,"isoinfo") == 0) Read_Info = 1;
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else Read_File = 1;
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if ((argc > 5 && Read_Dir) || (argc != 2 && Read_Info) ||
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(argc > 4 && Read_File)) usage();
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i = 1;
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while (i < argc && argv[i][0] == '-')
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{
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char *opt = argv[i++] + 1;
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if (opt[0] == '-' && opt[1] == '\0') break;
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while (*opt != '\0')
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{
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if (Read_Info) usage();
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if (Read_Dir)
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switch (*opt++)
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{
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case 'r': Recurse = 1; break;
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case 'l': Verbose = 1; break;
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case 'B': ByteOffset = 1; break;
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default: usage();
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}
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if (Read_File)
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switch (*opt++)
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{
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case 'a': Aflag = 1; break;
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case 'B': ByteOffset = 1; break;
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default: usage();
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}
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}
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}
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if (i >= argc) usage();
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input_file = argv[i++];
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if (Read_File)
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{
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if (i >= argc) usage();
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file_name = argv[i++];
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}
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if (Read_Dir)
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{
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file_name = "/";
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if (i < argc)
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{
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file_name = argv[i++];
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}
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}
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if (i < argc) usage();
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if (Read_File || Read_Dir)
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{
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for (i=0; file_name[i] != '\0'; i++)
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path[i] = LOWER_CASE(file_name[i]);
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path[i] = '\0';
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}
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/* Open file system (file or device) */
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if ((Device = open(input_file, O_RDONLY)) < 0)
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{
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fprintf (STDERR, "cannot open %s: %s\n", input_file, strerror(errno));
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exit(-1);
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}
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if (!valid_fs())
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{
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fprintf (STDERR, "File system not in ISO9660 or HIGH SIERRA format \n");
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exit(-1);
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}
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if (Read_Info)
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{
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if (Iso9660)
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iso_info(Iso_Vol_Desc);
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else
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hs_info(Hs_Vol_Desc);
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exit(0);
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}
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/* Lookup file */
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if ((entry = look_up(path)) != NULL_DIR)
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{
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if (Read_Dir)
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if (Recurse) recurse_dir(path,entry);
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else list_dir(entry);
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else
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list_file(entry);
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}
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else
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{
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if (Read_Dir)
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fprintf (STDERR, "Directory");
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else
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fprintf (STDERR, "File");
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fprintf (STDERR, " %s not found\n", path);
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exit(-1);
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}
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return 0;
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}
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struct dir_entry *look_up(path)
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char *path;
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{
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/* Lookup a file name */
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struct dir_entry *dir_ptr;
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long block;
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int nr_of_blocks;
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int offset;
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char name[MAX_NAME_LENGTH + 1];
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int name_index = 0;
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int last_in_path = 0;
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int found;
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int i,j;
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/* Get the right dir entry structure */
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if (Iso9660)
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dir_ptr = (struct dir_entry *) Iso_Vol_Desc->root_dir_entry;
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else
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dir_ptr = (struct dir_entry *) Hs_Vol_Desc->root_dir_entry;
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/* If we look for the root we already have the right entry */
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if (path[0] == '/')
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if (strlen(path) == 1) return dir_ptr;
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else name_index = 1; /* first name in path */
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/* Keep searching for the path elements until all are found */
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while (!last_in_path)
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{
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/* Get next name in path */
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for (i = name_index; i < strlen(path); i++)
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{
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if (path[i] == '/') break;
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name[i - name_index] = path[i];
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}
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last_in_path =
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(i == strlen(path) || (i == strlen(path) - 1 && path[i] == '/'));
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name[i-name_index] = '\0';
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name_index = i + 1;
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/* Get block of next directory */
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block = iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length);
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nr_of_blocks = (iso_733(dir_ptr->size) + (BLOCK_SIZE-1)) >> BLOCK_SHIFT;
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/* Search for file in dir entry */
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found = 0;
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for (j=0; j < nr_of_blocks && !found; j++)
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{
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/* Read a directory block */
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read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
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block++;
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dir_ptr = (struct dir_entry *) Buffer;
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offset = 0;
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/* Compare with all entries in this block */
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while (iso_711(dir_ptr->length) > 0 && offset < BLOCK_SIZE)
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{
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if (iso_cmp(name, dir_ptr,
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(Read_Dir || (!Read_Dir && !last_in_path))) == 0)
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{
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found = 1;
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break;
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}
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/* Next entry */
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offset += iso_711(dir_ptr->length);
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dir_ptr = (struct dir_entry *) (Buffer + offset);
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}
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}
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if (!found) return NULL_DIR; /* path element not found */
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}
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return dir_ptr;
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}
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void recurse_dir(path, dir_ptr)
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char *path;
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struct dir_entry *dir_ptr;
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{
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/* Recursively descend all directories starting with dir_ptr */
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char tmp_path[MAX_PATH_LENGTH];
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int i,j, path_length;
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long block, saveblock, dblock;
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int nr_of_blocks;
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int offset = 0;
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/* Save block number and nr of blocks of current dir entry because
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* list_dir changes dir_ptr
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*/
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block = iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length);
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nr_of_blocks = (iso_733(dir_ptr->size) + (BLOCK_SIZE-1)) >> BLOCK_SHIFT;
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/* Add a trailing / to path if necessary */
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path_length = strlen(path);
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if (path[path_length-1] != '/')
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{
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path[path_length++] = '/';
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path[path_length] = '\0';
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}
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/* Print current path of directory, and list contents of directory */
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fprintf(STDOUT,"directory %s:\n\n", path);
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list_dir(dir_ptr);
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fprintf(STDOUT,"\n\n");
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for (j=0; j < nr_of_blocks; j++)
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{
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read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
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saveblock = block++;
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/* Save buffer, because the next recursive call destroys
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* the global Buffer
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*/
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dir_ptr = (struct dir_entry *) Buffer;
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/* Search this dir entry for directories */
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offset = 0;
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while (iso_711(dir_ptr->length) != 0 && offset < BLOCK_SIZE)
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{
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/* Is current file a directory and not the . or .. entries */
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if (IS_DIR(dir_ptr) && !IS_DOT(dir_ptr) && !IS_DOT_DOT(dir_ptr))
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{
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/* setup path for next recursive call */
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for (i=0; i<path_length; i++) tmp_path[i] = path[i];
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for (i=0;i<iso_711(dir_ptr->name_length) && dir_ptr->name[i] != ';';i++)
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tmp_path[i+path_length] = LOWER_CASE(dir_ptr->name[i]);
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tmp_path[i+path_length] = '/';
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tmp_path[i+1+path_length] = '\0';
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/* Read block of directory we found */
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dblock = iso_733(dir_ptr->first_block);
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read_device(dblock*BLOCK_SIZE, BLOCK_SIZE, Buffer);
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/* And start all over again with this entry */
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recurse_dir(tmp_path, (struct dir_entry *) Buffer);
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/* get the block we were looking at */
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read_device(saveblock*BLOCK_SIZE, BLOCK_SIZE, Buffer);
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}
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/* Go to the next file in this directory */
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offset += iso_711(dir_ptr->length);
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dir_ptr = (struct dir_entry *) (Buffer + offset);
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}
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}
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}
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void list_dir(dir_ptr)
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struct dir_entry *dir_ptr;
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{
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/* List all entries in a directory */
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|
int tty;
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|
long block;
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int nr_of_blocks;
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int i,j;
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int offset = 0;
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char name[NR_OF_CHARS+NR_OF_BLANKS+1];
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int name_len;
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int column = 0;
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int skip = 0;
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tty = isatty(STDOUT_FILENO);
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/* Get first block of directory */
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block = iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length);
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nr_of_blocks = (iso_733(dir_ptr->size) + (BLOCK_SIZE-1)) >> BLOCK_SHIFT;
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|
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/* Read all directory blocks and display their contents */
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|
for (j=0; j < nr_of_blocks; j++)
|
|
{
|
|
read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
|
|
block++;
|
|
|
|
dir_ptr = (struct dir_entry *) (Buffer);
|
|
offset = 0;
|
|
while (iso_711(dir_ptr->length) != 0 && offset < BLOCK_SIZE)
|
|
{
|
|
name_len = 0;
|
|
if (IS_DOT(dir_ptr))
|
|
{
|
|
name[name_len++] = '.';
|
|
if (!Verbose) skip = 1;
|
|
}
|
|
else
|
|
{
|
|
if (IS_DOT_DOT(dir_ptr))
|
|
{
|
|
name[name_len++] = '.';
|
|
name[name_len++] = '.';
|
|
if (!Verbose) skip = 1;
|
|
}
|
|
else
|
|
{
|
|
for (i=0; i<iso_711(dir_ptr->name_length) &&
|
|
i<NR_OF_CHARS; i++)
|
|
{
|
|
if (dir_ptr->name[i] == ';') break;
|
|
name[name_len++] = LOWER_CASE(dir_ptr->name[i]);
|
|
}
|
|
if (IS_DIR(dir_ptr) && tty) name[name_len++] = '/';
|
|
}
|
|
}
|
|
if (!skip)
|
|
{
|
|
if (ByteOffset)
|
|
{
|
|
fprintf (STDOUT, "%10ld ",
|
|
(iso_733(dir_ptr->first_block) + iso_711(dir_ptr->ext_attr_length))
|
|
* BLOCK_SIZE);
|
|
}
|
|
if (Verbose || ByteOffset)
|
|
{
|
|
fprintf (STDOUT, "%10ld ", iso_733(dir_ptr->size));
|
|
}
|
|
if (Verbose)
|
|
{
|
|
print_dir_date(dir_ptr->date);
|
|
fprintf (STDOUT, " ");
|
|
}
|
|
if(!tty)
|
|
name[name_len] = '\0';
|
|
else {
|
|
for(i=name_len; i<(NR_OF_CHARS+NR_OF_BLANKS); i++) name[i] = ' ';
|
|
name[NR_OF_CHARS+NR_OF_BLANKS] = '\0';
|
|
}
|
|
fprintf(STDOUT, "%s", name);
|
|
if (!(Verbose || ByteOffset))
|
|
{
|
|
column++;
|
|
if (column >= NR_OF_COLS || !tty)
|
|
{
|
|
column = 0;
|
|
fprintf(STDOUT,"\n");
|
|
}
|
|
}
|
|
else fprintf(STDOUT,"\n");
|
|
}
|
|
skip = 0;
|
|
offset += iso_711(dir_ptr->length);
|
|
dir_ptr = (struct dir_entry *) (Buffer+offset);
|
|
}
|
|
}
|
|
if (!Verbose && column) fprintf(STDOUT,"\n");
|
|
}
|
|
|
|
|
|
void print_dir_date(date)
|
|
char *date;
|
|
{
|
|
/* Print date in a directory entry */
|
|
|
|
int m;
|
|
|
|
m = iso_711(&date[1]) - 1;
|
|
if(m < 0 || m > 11)
|
|
fprintf(STDOUT, " ");
|
|
else
|
|
fprintf(STDOUT,"%.3s",&months[m*3]);
|
|
|
|
fprintf (STDOUT, " %02d %04d %02d:%02d:%02d",
|
|
date[2],
|
|
1900+date[0],
|
|
date[3],
|
|
date[4],
|
|
date[5]);
|
|
}
|
|
|
|
|
|
void list_file(dir_ptr)
|
|
struct dir_entry *dir_ptr;
|
|
{
|
|
/* List contents of a file */
|
|
|
|
int i;
|
|
long block;
|
|
long size;
|
|
char c;
|
|
|
|
block = iso_733(dir_ptr->first_block);
|
|
size = iso_733(dir_ptr->size);
|
|
|
|
if (ByteOffset) {
|
|
fprintf(STDOUT, "%ld %ld\n", block*BLOCK_SIZE, size);
|
|
return;
|
|
}
|
|
|
|
while (size > 0)
|
|
if (Aflag == 1) {
|
|
read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
|
|
for (i=0; ((i < size) && (i < BLOCK_SIZE)); i++)
|
|
if (Buffer[i] != '\r') fprintf(STDOUT, "%c", Buffer[i]);
|
|
size-= BLOCK_SIZE;
|
|
block++;
|
|
} else {
|
|
read_device(block*BLOCK_SIZE, BLOCK_SIZE, Buffer);
|
|
for (i=0; ((i < size) && (i < BLOCK_SIZE)); i++)
|
|
fprintf(STDOUT, "%c", Buffer[i]);
|
|
size-= BLOCK_SIZE;
|
|
block++;
|
|
}
|
|
}
|
|
|
|
|
|
void print_date(date)
|
|
char *date;
|
|
{
|
|
/* Print the date in a volume descriptor */
|
|
|
|
fprintf (STDOUT, "%c%c-%c%c-%c%c%c%c %c%c:%c%c:%c%c",
|
|
date[4],
|
|
date[5],
|
|
date[6],
|
|
date[7],
|
|
date[0],
|
|
date[1],
|
|
date[2],
|
|
date[3],
|
|
date[8],
|
|
date[9],
|
|
date[10],
|
|
date[11],
|
|
date[12],
|
|
date[13]);
|
|
}
|
|
|
|
void iso_info(vol_desc)
|
|
struct iso9660_descriptor *vol_desc;
|
|
{
|
|
int i;
|
|
|
|
fprintf (STDOUT, "Format: ISO9660 \n");
|
|
fprintf (STDOUT, "System id: ");
|
|
for (i=0; i< sizeof(vol_desc->system_id); i++)
|
|
fprintf(STDOUT, "%c", vol_desc->system_id[i]);
|
|
fprintf (STDOUT, "\n");
|
|
fprintf (STDOUT, "Volume id: ");
|
|
for (i=0; i< sizeof(vol_desc->volume_id); i++)
|
|
fprintf(STDOUT, "%c", vol_desc->volume_id[i]);
|
|
fprintf (STDOUT, "\n");
|
|
fprintf (STDOUT, "Volume size: %ld Kb\n", iso_733(vol_desc->volume_size)*2);
|
|
fprintf (STDOUT, "Block size: %d bytes \n", iso_723(vol_desc->block_size));
|
|
fprintf (STDOUT, "Creation date: ");
|
|
print_date(vol_desc->creation_date);
|
|
fprintf(STDOUT, "\n");
|
|
fprintf (STDOUT, "Modification date: ");
|
|
print_date(vol_desc->mod_date);
|
|
fprintf (STDOUT, "\n");
|
|
fprintf (STDOUT, "Expiration date: ");
|
|
print_date(vol_desc->exp_date);
|
|
fprintf (STDOUT, "\n");
|
|
fprintf (STDOUT, "Effective date: ");
|
|
print_date(vol_desc->eff_date);
|
|
fprintf (STDOUT, "\n");
|
|
}
|
|
|
|
|
|
void hs_info(vol_desc)
|
|
struct high_sierra_descriptor *vol_desc;
|
|
{
|
|
int i;
|
|
|
|
fprintf (STDOUT, "Format: HIGH SIERRA \n");
|
|
fprintf (STDOUT, "System id: ");
|
|
for (i=0; i< sizeof(vol_desc->system_id); i++)
|
|
fprintf(STDOUT, "%c", vol_desc->system_id[i]);
|
|
fprintf (STDOUT, "\n");
|
|
fprintf (STDOUT, "Volume id: ");
|
|
for (i=0; i< sizeof(vol_desc->volume_id); i++)
|
|
fprintf(STDOUT, "%c", vol_desc->volume_id[i]);
|
|
fprintf (STDOUT, "\n");
|
|
fprintf (STDOUT, "Volume size: %ld Kb\n", (iso_733(vol_desc->volume_size)*2));
|
|
fprintf (STDOUT, "Block size: %d bytes \n", iso_723(vol_desc->block_size));
|
|
}
|
|
|
|
|
|
int valid_fs()
|
|
{
|
|
|
|
int i;
|
|
|
|
/* search for a volume descriptor */
|
|
for (i=16; i<100; i++)
|
|
{
|
|
|
|
read_device((long)(i)*BLOCK_SIZE, BLOCK_SIZE, Buffer);
|
|
|
|
Iso_Vol_Desc = (struct iso9660_descriptor *) Buffer;
|
|
Hs_Vol_Desc = (struct high_sierra_descriptor *) Buffer;
|
|
|
|
if (strncmp(Iso_Vol_Desc->id, ISO9660_ID, sizeof Iso_Vol_Desc->id) == 0)
|
|
{
|
|
/* iso_info(Iso_Vol_Desc); */
|
|
Iso9660 = 1;
|
|
break;
|
|
}
|
|
|
|
if (strncmp(Hs_Vol_Desc->id, HIGH_SIERRA_ID, sizeof Hs_Vol_Desc->id) == 0)
|
|
{
|
|
/* hs_info(Hs_Vol_Desc); */
|
|
High_Sierra = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i >= 100) return 0;
|
|
return 1;
|
|
}
|
|
|
|
|
|
void read_device(offset, nr_of_bytes, buffer)
|
|
long offset;
|
|
int nr_of_bytes;
|
|
char *buffer;
|
|
{
|
|
int bytes_read;
|
|
|
|
if (lseek(Device, offset, SEEK_SET) == -1)
|
|
{
|
|
fflush (stdout);
|
|
fprintf (STDERR, "seek error: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
bytes_read = read(Device, buffer, nr_of_bytes);
|
|
if (bytes_read != nr_of_bytes)
|
|
{
|
|
fprintf (STDERR, "read error: %s\n",
|
|
bytes_read >= 0 ? "Short read" : strerror(errno));
|
|
exit (1);
|
|
}
|
|
}
|
|
|
|
|
|
/* The ISO9660 functions */
|
|
|
|
int iso_711 (c)
|
|
char *c;
|
|
{
|
|
return (*c & 0xff);
|
|
}
|
|
|
|
|
|
int iso_712 (c)
|
|
char *c;
|
|
{
|
|
int n;
|
|
|
|
n = *c;
|
|
if (n & 0x80) n |= 0xffffff00;
|
|
return n;
|
|
}
|
|
|
|
int iso_721 (c)
|
|
char *c;
|
|
{
|
|
return ((c[0] & 0xff) | ((c[1] & 0xff) << 8));
|
|
}
|
|
|
|
int iso_722 (c)
|
|
char *c;
|
|
{
|
|
return (((c[0] & 0xff) << 8) | (c[1] & 0xff));
|
|
}
|
|
|
|
int iso_723 (c)
|
|
char *c;
|
|
{
|
|
if (c[0] != c[3] || c[1] != c[2])
|
|
{
|
|
fprintf (STDERR, "Invalid ISO 7.2.3 number\n");
|
|
exit (1);
|
|
}
|
|
return (iso_721 (c));
|
|
}
|
|
|
|
long iso_731 (c)
|
|
char *c;
|
|
{
|
|
return ((long)(c[0] & 0xff)
|
|
| ((long)(c[1] & 0xff) << 8)
|
|
| ((long)(c[2] & 0xff) << 16)
|
|
| ((long)(c[3] & 0xff) << 24));
|
|
}
|
|
|
|
|
|
long iso_732 (c)
|
|
char *c;
|
|
{
|
|
return (((long)(c[0] & 0xff) << 24)
|
|
| (((long)c[1] & 0xff) << 16)
|
|
| (((long)c[2] & 0xff) << 8)
|
|
| ((long)c[3] & 0xff));
|
|
}
|
|
|
|
long iso_733 (c)
|
|
char *c;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
{
|
|
if (c[i] != c[7-i])
|
|
{
|
|
fprintf (STDERR, "Invalid ISO 7.3.3 number\n");
|
|
exit (1);
|
|
}
|
|
}
|
|
return (iso_731(c));
|
|
}
|