ntcat.c

NTFS 磁盘系统 加载源代码

/*
 *  ntcat.c
 *
 *  Copyright (C) 1995 Martin von L鰓is
 */

#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_GETOPT_LONG
#include <getopt.h>
#else
#define getopt_long(a,v,o,ol,x)        getopt(a,v,o)
#endif
#include <unistd.h>
#include <string.h>
#include "ntfs.h"
#include "version.h"

char *short_opts="f:o:l:B:1V";
#ifdef HAVE_GETOPT_LONG
struct option options[]={
	{"filesystem",1,0,'f'},
	{"offset",1,0,'o'},
	{"size",1,0,'s'},
	{"bias",1,0,'b'},
	{"8859-1",0,0,'1'},
	{"version",0,0,'V'},
	{0,0,0,0}
};
#endif

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

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

	position=offset;
	if(length)
		bufsize=length;
	else
		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;
	/* read from the unnamed data attribute */
	while((len=ntfs_read_attr(ino,AT_DATA,NULL,
				  position,&io,bufsize))>0)
	{
		write(1,buf,len);
		position+=len;
		length-=len;
		if(length==0)
			break;
		io.param=buf;
	}
	free(buf);
}

int main(int argc,char *argv[])
{
	int c;
	char *device=0;
	int offset=0;
	int length=0;
	char *name;
	ntfs_inode ino;
	int inum;
	int bias=0;
	extern int opterr,optind;
	extern char* optarg;
	enum ntfs_charset_type charset=nct_utf8;

	opterr=1;
	while((c=getopt_long(argc,argv,short_opts,options,NULL))>0)
		switch(c)
		{
		case 'f': device=optarg;break;
		case 'o': offset=strtol(optarg,NULL,0);break;
		case 'l': length=strtol(optarg,NULL,0);break;
		case 'B': bias=strtol(optarg,NULL,0);break;
		case '1': charset=nct_iso8859_1;break;
		case 'V': printf("ntcat " NTFS_VERSION "\n");exit(0);break;
		}
	name=argv[optind];
	if(!ntfs_open_volume(device,bias,1,0))return 1;
	the_vol->nct=charset;
	inum=5;
	/* walk the directory tree */
	do{
		char *next;
		ntfs_init_inode(&ino,the_vol,inum);
		if(!name || !*name)break;
		next=strchr(name,'/');
		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);
	ntfs_init_inode(&ino,the_vol,inum);
	ntfs_cat_file(&ino,offset,length);
	return 0;
}

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