CD Actual 85/CD Temático 40 Febrero 2004.iso/DOS/ntfs/user/ntcat.c

C/C++ Source or Header | 2001-02-15 | 4.3 KB | 205 lines

/*
 *  ntcat.c
 *
 *  Copyright (C) 1995-1997 Martin von L÷wis
 *  Copyright (C) 1997 RΘgis Duchesne
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#else
#define getopt_long(a,v,o,ol,x)        getopt(a,v,o)
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _WINDOWS
#include <fcntl.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
#include <string.h>
#include "ntfstypes.h"
#include "struct.h"
#include "util.h"
#include "inode.h"
#include "nttools.h"

char *short_opts="o:s:B:b:1Vh";
#ifdef HAVE_GETOPT_H
struct option options[]={
    {"offset",1,0,'o'},
    {"size",1,0,'s'},
    {"bias",1,0,'B'},
    {"buflen",1,0,'b'},
    {"8859-1",0,0,'1'},
    {"version",0,0,'V'},
    {"help",0,0,'h'},
    {0,0,0,0}
};
#endif

char usage_str[]=
"ntcat: dumps the contents of an NTFS file to stdout\n"
"ntcat [OPTIONS] [directory/]filename\n"
"  --offset, -o offset         Use offset\n"
"  --size, -s size           Only first size bytes\n"
"  --bias, -B bias           Use partition bias\n"
"  --buflen, -b buflen       Read with buffer size buflen\n"
"  --8859-1, -1              Use charset ISO-8859-1\n"
"                            (default is UTF-8)\n"
"  --version, -V             Display version\n"
"  --help, -h                Display this message\n"
;


void usage(void)
{
/*      fprintf(stderr,"ntcat [-f device] [-o offset] [-l size] [-1] [directory/]filename\n");*/
    fprintf(stderr,usage_str);

}

/* print the file ino on stdout */
void ntfs_cat_file(ntfs_inode *ino,int offset,int length,int bufsize)
{
    int position;
    char *buf;
    ntfs_io io;

    position=offset;
    if(!bufsize) bufsize=8192;
    buf=(char*)malloc(bufsize);
    /* Very large file */
    if(!buf)
    {
        bufsize=8192;
        buf=(char*)malloc(bufsize);
        if(!buf)
        {
            perror("ntcat");
            exit(0);
        }
    }
    io.fn_put=ntfs_put;
    io.fn_get=0;
    io.do_read=1;
    io.param=buf;
    io.size=bufsize;
    /* read from the unnamed data attribute */
    while(ntfs_read_attr(ino,ino->vol->at_data,
                 NULL,position,&io)==0 && io.size)
    {
        if(write(1,buf,io.size)!=io.size){
            perror("write");
            exit(1);
        }
        position+=io.size;
        length-=io.size;
        if(length==0)
            break;
        io.param=buf;
        io.size=bufsize;
    }
    free(buf);
}

int main(int argc,char *argv[])
{
    int c;
    char device[256]={'\0'};        /* KM */
    char *it;                       /* KM */
#ifdef _WINDOWS
    devname[32];
#endif
    int offset=0;
    int length=0;
    char *name;
    ntfs_volume *volume;
    ntfs_inode ino;
    int inum;
    int bias=0;
    int buflen=8192;
    extern int opterr,optind;
    extern char* optarg;
    unsigned int charset=nct_utf8;

    opterr=1;
    while((c=getopt_long(argc,argv,short_opts,options,NULL))>0)
        switch(c)
        {
        case 'o': offset=strtol(optarg,NULL,0);break;
        case 's': length=strtol(optarg,NULL,0);break;
        case 'B': bias=strtol(optarg,NULL,0);break;
        case 'b': buflen=strtol(optarg,NULL,0);break;
        case '1': charset=nct_iso8859_1;break;
        case 'V': printf("ntcat " NTFS_VERSION "\n");exit(0);break;
        case 'h': usage();exit(0);break;
        }
    if(optind+1!=argc){
        usage();
        exit(1);
    }
    name=argv[optind];
    for(it=name+2;*it && *it!='/';it++)
        /*nothing*/;
    if(it!=name+2)
    {
      strcpy(device,"/dev/");
      strncpy(device+5,name+2,(it-name)-2);
      device[(it-name)+3]='\0';
    }
#ifdef _WINDOWS
    _setmode(fileno(stdout),_O_BINARY);
    if(!device && name[1]=':'){
        strcpy(devname,"\\\\.\\C:");
        devname[4] = name[0];
        name+=3;
        device=devname;
    }
#endif
    volume=ntfs_open_volume(device,bias,1,0);
    if(!volume)return 1;
    volume->nct=charset;
    inum=5;
    name=it;                /* KM */
    if(*name=='/')name++;   /* KM */
    /* walk the directory tree */
    do{
        char *next;
        if(ntfs_init_inode(&ino,volume,inum)){
            fprintf(stderr,"error finding %s\n",name);
            return 1;
        }
        if(!name || !*name)break;
        next=strpbrk(name,NTFS_PATH_SEP);
        if(next){
            *next='\0';
            next++;
        }
        inum=ntfs_find_file(&ino,name);
        if(inum==-1){
            fprintf(stderr,"%s not found\n",name);
            return 1;
        }
        name=next;
    }while(1);
    if(ntfs_init_inode(&ino,volume,inum))
        fprintf(stderr,"error opening %s\n",name);
    ntfs_cat_file(&ino,offset,length,buflen);
    return 0;
}

/*
 * Local variables:
 * c-file-style: "linux"
 * End:
 */