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/*
* This file is part of dds2tar.
* Copyright by J"org Weule
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/mtio.h>
#include <unistd.h>
#include <string.h>
#include "dds2tar.h"
#include "dds_tape.h"
static int cur_rec;
static int cur_byte;
static const char hash_sign = '#';
/********
* Skip to the next block.
*
********************************************************************/
void dds_index_skip(){
/*
* The hp-DAT is slowed down with dds_getpos().
* Is there a reason for this?
*
* Now the cur_blkno is incremented.
*/
cur_rec -= cur_bs;
dds_read_next_block();
cur_byte += cur_n;
if (hash_mode == 1)
if ((cur_blkno & 0x1f) == 0) {
if ((cur_blkno & 0x7ff) == 0) {
fprintf(stderr, " %d\n",cur_byte);
fflush(stderr);
}
write(2, &hash_sign, 1);
}
}
/********
* Converting a tar-record to an entry in the index file.
*
* input: tar_record is the header of one file in the archive.
* The location of the header is given by the
* block and index value.
* output: The returned index is the location of the next header.
* Normalization of the pair (block,rec) with respect to
* the block length will give the right position.
* extern: index_fp, verbose
* index_fp is the FILE to write the rec.
* verbose indicates the loggin mode.
*
* If the name length of the file name is zero,
* and an empty block is found, the end
* of the archive is found and the program stops.
*
********************************************************************/
static int
dds_index_h(tar_record *const ptr, int const block, int rec)
{
int size;
char *p = ptr->hdr.magic;
#ifdef DDS_TRACE
fputs("dds_index_h()\n", stderr);
#endif
if ( dds_is_tar_header_record(ptr) == 0 ) {
fprintf(stderr,"dds2index: skipping to next header\n");
return ( rec + 1 ) ;
}
if (*p == 0)
p = "magic ";
if (ptr->hdr.linkflag == 'V') p = "label ";
else if (p[6] == ' ')
p[6] = 0;
if (ptr->hdr.name[0] == 0) {
int i = 0;
while ((((char *) ptr)[i] == 0) && (i < 512))
i++;
if (i == 512) {
fprintf(index_fp, dds_index_format,
"-end- ",
block,
rec,
0, "(null)");
close(device);
exit(0);
}
}
if (ptr->hdr.size[0] != 0)
sscanf(ptr->hdr.size, "%o", &size);
else
size = 0;
long_name_len = 0 ;
if ( ptr->hdr.linkflag == LF_LONGNAME ) long_name_len = size ;
{
char *name = ptr->hdr.name ;
if ( ptr->hdr.linkflag != LF_LONGLINK &&
ptr->hdr.linkflag != LF_LONGNAME &&
long_name[0] != '\0' ) name = long_name ;
sprintf(cur_line, dds_index_format,
p,
block,
rec,
size,
name
);
fputs(cur_line, index_fp);
if ( ptr->hdr.linkflag != LF_LONGLINK &&
ptr->hdr.linkflag != LF_LONGNAME ) {
long_name[0] = '\0' ;
}
}
if (verbose)
fputs(cur_line, stderr);
/* calculate the number of records */
/* there was one header record */
size += 511 + 512;
size >>= 9;
rec += size;
return rec;
}
/********
* Converting a table line to the numbers.
*
*/
int
rt_line(
int *const ptr_blkno,
int *const ptr_recno,
int *const ptr_size,
char **const ptr_name
)
{
char p[16];
int i;
char const *dds_fmt = NULL;
#ifdef DDS_TRACE
fprintf(stderr,"rt_line(...)\n");
#endif
if (cur_line[16] == ':') {
dds_fmt = dds_old_index_scan_format ;
*ptr_name = cur_line + 27;
} else {
if (cur_line[17] == ':') {
dds_fmt = dds_index_scan_format ;
*ptr_name = cur_line + 28;
} else return 1 ;
} ;
if ((i = sscanf(cur_line,
dds_fmt,
p,
ptr_blkno,
ptr_recno,
ptr_size)) < 4)
fprintf(stderr, "Wrong line inside the index file,"
" scanned %d values\n", i);
#ifdef DDS_TRACE
fprintf(stderr,"end >> rt_line(...)\n");
#endif
return 0 ;
}
/* procedure to create the index table */
/********
* input: none
* output: none
* extern: device, index_fp
*
* The archive is read, and the index file is written.
*
************************************************************/
int
dds_index(void)
{
#ifdef DDS_TRACE
fputs("dds_index()\n", stderr);
#endif
fputs(dds_headline, index_fp);
if (verbose) fputs(dds_headline, index_fp);
next_blkno = -1 ;
cur_rec = 0;
dds_read_block();
cur_byte = cur_n;
if (hash_mode == 1)
if ((cur_blkno & 0x1f) == 0) {
write(2, &hash_sign, 1);
}
while (cur_n > 0) {
cur_bs = cur_n >> 9;
while (cur_rec < cur_bs) {
int new_rec ;
new_rec = dds_index_h(
cur_block + cur_rec,
cur_blkno,
cur_rec
);
if ( long_name_len > 0 ) {
int i = 0 ;
while ( long_name_len > (i<<9) ){
cur_rec++;
/*
* note: dds_index_skip operates on
* cur_rec
*/
if ( cur_rec >= cur_bs )
dds_index_skip();
memcpy(long_name+((i++)<<9),
cur_block+cur_rec,
512);
}
long_name_len = 0 ;
/* Now go to the next block behind the
long name */
cur_rec++;
}
else cur_rec = new_rec ;
}
dds_index_skip();
}
if (cur_n <= 0) {
perror("dds2tar");
fprintf(stderr, "dds_index: unexpected end of tar archive \n");
close(device);
exit(9);
}
return 0;
}
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