mirror of
https://github.com/open-simh/simtools.git
synced 2026-01-14 15:45:23 +00:00
817 lines
17 KiB
C
817 lines
17 KiB
C
/*
|
||
* Copyright (C) 2018 John Forecast. All Rights Reserved.
|
||
*
|
||
* Redistribution and use in source and binary forms, with or without
|
||
* modification, are permitted provided that the following conditions are met:
|
||
*
|
||
* 1. Redistributions of source code must retain the above copyright notice,
|
||
* this list of conditions and the following disclaimer.
|
||
*
|
||
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||
* this list of conditions and the following disclaimer in the documentation
|
||
* and/or other materials provided with the distribution.
|
||
*
|
||
* 3. The name of the author may not be used to endorse or promote products
|
||
* derived from this software without specific prior written permission.
|
||
*
|
||
* THIS SOFTWARE IS PROVIDED BY JOHN FORECAST "AS IS" AND ANY EXPRESS OR
|
||
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
||
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
||
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
||
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
||
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
*/
|
||
|
||
/*
|
||
* Support routines for reading/writing SIMH tape container files.
|
||
*/
|
||
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <unistd.h>
|
||
#include <string.h>
|
||
#include <ctype.h>
|
||
#include <time.h>
|
||
#include <sys/stat.h>
|
||
|
||
#include "fsio.h"
|
||
|
||
/*++
|
||
* t a p e V e r i f y
|
||
*
|
||
* Verify that the container format is valid, leaving the tape positioned
|
||
* at beginning-of-tape.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* eot - return end-of-tape info here, NUL if not needed
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if format is valid, 0 otherwise
|
||
*
|
||
--*/
|
||
int tapeVerify(
|
||
FILE *container,
|
||
off_t *eot
|
||
)
|
||
{
|
||
int errorCount = 0, tmSeen = 0;
|
||
uint32_t meta, header, bc;
|
||
off_t position;
|
||
struct stat stat;
|
||
|
||
/*
|
||
* Determine the size of the file.
|
||
*/
|
||
fstat(fileno(container), &stat);
|
||
|
||
for (;;) {
|
||
position = ftello(container);
|
||
|
||
/*
|
||
* If we are positioned at the end-of-file, there is a tape mark or
|
||
* end-of-media marker missing. Treat it as though one is present.
|
||
*/
|
||
if (position == stat.st_size)
|
||
break;
|
||
|
||
if (fread(&meta, sizeof(meta), 1, container) != 1)
|
||
return 0;
|
||
|
||
bc = le32toh(meta);
|
||
|
||
switch (bc) {
|
||
case ST_TM:
|
||
if (++tmSeen <= 1)
|
||
break;
|
||
/* Treat second TM in a row as end of medium */
|
||
/* FALLTHROUGH */
|
||
|
||
case ST_EOM:
|
||
if (fseeko(container, -sizeof(meta), SEEK_CUR) != 0)
|
||
return 0;
|
||
|
||
if (errorCount)
|
||
printf("mount: Tape contains error records\n");
|
||
goto done;
|
||
|
||
case ST_GAP:
|
||
break;
|
||
|
||
default:
|
||
/*
|
||
* Record descriptor
|
||
*/
|
||
tmSeen = 0;
|
||
|
||
header = bc;
|
||
if ((bc & ST_ERROR) != 0)
|
||
errorCount++;
|
||
if ((bc & ST_MBZ) != 0)
|
||
return 0;
|
||
|
||
bc = RECLEN(bc & ST_LENGTH);
|
||
|
||
/*
|
||
* Check if we are seeking ouside of the file. If so, this is not
|
||
* a .tap container file.
|
||
*/
|
||
if ((position + bc + (2 * sizeof(meta))) > (unsigned long long)stat.st_size)
|
||
return 0;
|
||
|
||
if (fseeko(container, bc, SEEK_CUR) != 0)
|
||
return 0;
|
||
if (fread(&meta, sizeof(meta), 1, container) != 1)
|
||
return 0;
|
||
|
||
bc = le32toh(meta);
|
||
|
||
if (header != bc)
|
||
return 0;
|
||
}
|
||
}
|
||
done:
|
||
if (eot != NULL)
|
||
*eot = ftello(container);
|
||
|
||
/*
|
||
* Position at beginning-of-tape.
|
||
*/
|
||
if (fseeko(container, 0, SEEK_SET) == 0)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
/*++
|
||
* t a p e G e t P o s i t i o n
|
||
*
|
||
* Get the current position of the tape.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* Current position of the tape
|
||
*
|
||
--*/
|
||
off_t tapeGetPosition(
|
||
FILE *container
|
||
)
|
||
{
|
||
return ftello(container);
|
||
}
|
||
|
||
/*++
|
||
* t a p e S e t P o s i t i o n
|
||
*
|
||
* Position the tape to a position previously obtained by tapeGetPosition().
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* pos - requested position
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if successfully positioned, 0 if error
|
||
*
|
||
--*/
|
||
int tapeSetPosition(
|
||
FILE *container,
|
||
off_t pos
|
||
)
|
||
{
|
||
return fseeko(container, pos, SEEK_SET) == 0 ? 1 : 0;
|
||
}
|
||
|
||
/*++
|
||
* t a p e S k i p R e c o r d F
|
||
*
|
||
* Skip over the next record in the forward direction.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* ST_FAIL - error accessing container file
|
||
* ST_EOM - end of media detected
|
||
* ST_TM - tape mark detected
|
||
* Other - record length (including error flag)
|
||
*
|
||
--*/
|
||
uint32_t tapeSkipRecordF(
|
||
FILE *container
|
||
)
|
||
{
|
||
return tapeReadRecordLength(container);
|
||
}
|
||
|
||
/*++
|
||
* t a p e S k i p R e c o r d R
|
||
*
|
||
* Skip over the next record in the reverse direction.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* ST_FAIL - error accessing container file
|
||
* ST_EOM - end of media detected
|
||
* ST_TM - tape mark detected
|
||
* Other - record length (including error flag)
|
||
*
|
||
--*/
|
||
uint32_t tapeSkipRecordR(
|
||
FILE *container
|
||
)
|
||
{
|
||
return tapeReadRecordLengthReverse(container);
|
||
}
|
||
|
||
/*++
|
||
* t a p e P e e k R e c o r d L e n g t h
|
||
*
|
||
* Get the length of the next record on the tape without actually reading
|
||
* the data or changing the current position of the tape.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* ST_FAIL - error accessing the container file
|
||
* ST_EOM - end of media detected
|
||
* ST_TM - tape mark detected
|
||
* Other - record length (including error flag)
|
||
*
|
||
--*/
|
||
uint32_t tapePeekRecordLength(
|
||
FILE *container
|
||
)
|
||
{
|
||
off_t pos = ftello(container);
|
||
uint32_t meta;
|
||
|
||
if ((fread(&meta, sizeof(meta), 1, container) != 1) ||
|
||
(fseeko(container, pos, SEEK_SET) != 0))
|
||
return ST_FAIL;
|
||
|
||
return le32toh(meta);
|
||
}
|
||
|
||
/*++
|
||
* t a p e R e a d R e c o r d
|
||
*
|
||
* Read the next record from the tape into the specified buffer. If the
|
||
* buffer is smaller than the record, the entire record will be consumed,
|
||
* losing data.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* buf - pointer to the buffer to receive the data
|
||
* len - length of the buffer
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* ST_FAIL - error accessing the container file
|
||
* ST_EOM - end of media detected
|
||
* ST_TM - tape mark detected
|
||
* Other - record length (including error flag)
|
||
* if the buffer is smaller than the record, the
|
||
* length returned will be that of the buffer
|
||
*
|
||
--*/
|
||
uint32_t tapeReadRecord(
|
||
FILE *container,
|
||
void *buf,
|
||
int len
|
||
)
|
||
{
|
||
off_t pos = ftello(container);
|
||
uint32_t meta, bc, erflag, length;
|
||
|
||
if (fread(&meta, sizeof(meta), 1, container) != 1)
|
||
return ST_FAIL;
|
||
|
||
bc = le32toh(meta);
|
||
|
||
switch (bc) {
|
||
case ST_EOM:
|
||
case ST_TM:
|
||
return bc;
|
||
|
||
default:
|
||
erflag = bc & ST_ERROR;
|
||
bc &= ST_LENGTH;
|
||
|
||
length = (uint32_t)len;
|
||
if (bc < length)
|
||
length = bc;
|
||
|
||
if (fread(buf, sizeof(uint8_t), length, container) != length)
|
||
return ST_FAIL;
|
||
|
||
/*
|
||
* Now position the file after this record.
|
||
*/
|
||
pos += RECLEN(bc) + (2 * sizeof(meta));
|
||
if (fseeko(container, pos, SEEK_SET) != 0)
|
||
return ST_FAIL;
|
||
|
||
return erflag | length;
|
||
}
|
||
return ST_FAIL;
|
||
}
|
||
|
||
/*++
|
||
* t a p e R e a d R e c o r d L e n g t h
|
||
*
|
||
* Get the length of the next record on the tape without actually reading
|
||
* the data. The tape will be positioned at the start of the next record.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* ST_FAIL - error accessing container file
|
||
* ST_EOM - end of media detected
|
||
* ST_TM - tape mark detected
|
||
* Other - record length (including error flag)
|
||
*
|
||
--*/
|
||
uint32_t tapeReadRecordLength(
|
||
FILE *container
|
||
)
|
||
{
|
||
off_t pos = ftello(container);
|
||
uint32_t meta, bc, erflag;
|
||
|
||
if (fread(&meta, sizeof(meta), 1, container) != 1)
|
||
return ST_FAIL;
|
||
|
||
bc = le32toh(meta);
|
||
|
||
switch (bc) {
|
||
case ST_EOM:
|
||
case ST_TM:
|
||
return bc;
|
||
|
||
default:
|
||
erflag = bc & ST_ERROR;
|
||
bc &= ST_LENGTH;
|
||
|
||
/*
|
||
* Now position the file after this record.
|
||
*/
|
||
pos += RECLEN(bc) + (2 * sizeof(meta));
|
||
if (fseeko(container, pos, SEEK_SET) != 0)
|
||
return ST_FAIL;
|
||
|
||
return erflag | bc;
|
||
}
|
||
return ST_FAIL;
|
||
}
|
||
|
||
/*++
|
||
* t a p e R e a d R e c o r d L e n g t h R e v e r s e
|
||
*
|
||
* Get the length of the previous record on the tape without actually reading
|
||
* the data. The tape will be positioned at the start of the previous record.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* ST_FAIL - error accessing container file
|
||
* ST_EOM - end of media detected
|
||
* ST_TM - tape mark detected
|
||
* Other - record length (including error flag)
|
||
*
|
||
--*/
|
||
uint32_t tapeReadRecordLengthReverse(
|
||
FILE *container
|
||
)
|
||
{
|
||
uint32_t meta, bc, erflag;
|
||
off_t delta;
|
||
|
||
if ((fseeko(container, -sizeof(meta), SEEK_CUR) != 0) ||
|
||
(fread(&meta, sizeof(meta), 1, container) != 1))
|
||
return ST_FAIL;
|
||
|
||
bc = le32toh(meta);
|
||
|
||
switch (bc) {
|
||
case ST_EOM:
|
||
case ST_TM:
|
||
if (fseeko(container, -sizeof(meta), SEEK_CUR) != 0)
|
||
return ST_FAIL;
|
||
return bc;
|
||
|
||
default:
|
||
erflag = bc & ST_ERROR;
|
||
bc &= ST_LENGTH;
|
||
|
||
/*
|
||
* Now position the file before this record.
|
||
*/
|
||
delta = RECLEN(bc) + (2 * sizeof(meta));
|
||
if (fseeko(container, -delta, SEEK_CUR) != 0)
|
||
return ST_FAIL;
|
||
|
||
return erflag | bc;
|
||
}
|
||
return ST_FAIL;
|
||
}
|
||
|
||
/*++
|
||
* t a p e W r i t e R e c o r d
|
||
*
|
||
* Write a record to the tape at it's current position leaving the tape
|
||
* positioned after the newly written record.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* buf - pointer to the record to be written
|
||
* len - length of the record
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if record was successfully written, 0 otherwise
|
||
*
|
||
--*/
|
||
int tapeWriteRecord(
|
||
FILE *container,
|
||
void *buf,
|
||
int len
|
||
)
|
||
{
|
||
uint32_t meta = htole16(len);
|
||
int datalen = (len + 1) & ~1;
|
||
|
||
if ((fwrite(&meta, sizeof(meta), 1, container) != 1) ||
|
||
(fwrite(buf, datalen, 1, container) != 1) ||
|
||
(fwrite(&meta, sizeof(meta), 1, container) != 1))
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/*++
|
||
* t a p e W r i t e E O M
|
||
*
|
||
* Write an end-of-media record to the tape at it's current position and,
|
||
* optionally, backup the tape to before the newly written record.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* backup - if 1, position the tape before the new record
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if EOM record successfully written, 0 otherwise
|
||
*
|
||
--*/
|
||
int tapeWriteEOM(
|
||
FILE *container,
|
||
int backup
|
||
)
|
||
{
|
||
uint32_t eom = htole32(ST_EOM);
|
||
|
||
if (fwrite(&eom, sizeof(eom), 1, container) != 1)
|
||
return 0;
|
||
|
||
if (backup)
|
||
if (fseeko(container, -sizeof(eom), SEEK_CUR) != 0)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/*++
|
||
* t a p e W r i t e T M
|
||
*
|
||
* Write a tape mark record to the tape at it's current position.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if EOM record successfully written, 0 otherwise
|
||
*
|
||
--*/
|
||
int tapeWriteTM(
|
||
FILE *container
|
||
)
|
||
{
|
||
uint32_t tm = htole32(ST_TM);
|
||
|
||
if (fwrite(&tm, sizeof(tm), 1, container) != 1)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/*++
|
||
* t a p e E O M
|
||
*
|
||
* Position the tape to the end of media so that a subsequent write will
|
||
* append a file to the tape.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* eot - pointer to end-of-tape position, NULL if
|
||
* not available
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if tape successfully positioned, 0 otherwise
|
||
*
|
||
--*/
|
||
int tapeEOM(
|
||
FILE *container,
|
||
off_t *eot
|
||
)
|
||
{
|
||
int whence = eot == NULL ? SEEK_END : SEEK_SET;
|
||
off_t pos = eot == NULL ? 0 : *eot;
|
||
uint32_t bc1, bc2;
|
||
|
||
/*
|
||
* Move to the end of the tape and then look backwards to see how it is
|
||
* terminated.
|
||
*/
|
||
if (fseeko(container, pos, whence) == 0) {
|
||
if (ftello(container) == 0) {
|
||
/*
|
||
* Empty file, we are correctly positioned.
|
||
*/
|
||
return 1;
|
||
}
|
||
|
||
if ((bc1 = tapeReadRecordLengthReverse(container)) == ST_FAIL)
|
||
return 0;
|
||
|
||
if ((bc1 == ST_EOM) || (bc1 == ST_TM)) {
|
||
if (ftello(container) == 0) {
|
||
/*
|
||
* Only ST_EOM or ST_TM present, we are correctly positioned.
|
||
*/
|
||
return 1;
|
||
}
|
||
|
||
if ((bc2 = tapeReadRecordLengthReverse(container)) == ST_FAIL)
|
||
return 0;
|
||
|
||
if (bc2 == ST_TM) {
|
||
if (ftello(container) == 0) {
|
||
/*
|
||
* Only ST_TM followed by ST_TM or ST_EOM, we are correctly
|
||
* positioned
|
||
*/
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
* ST_TM followed by ST_TM or ST_EOM with at least one data block
|
||
* present, skip over the initial ST_TM.
|
||
*/
|
||
if (fseeko(container, sizeof(uint32_t), SEEK_CUR) == 0)
|
||
return 1;
|
||
} else {
|
||
/*
|
||
* Only a single ST_TM at the end of the container file. This
|
||
* indicates that there is a missing ST_TM or ST_EOM. Position
|
||
* the tape at the logical end-of-tape so that any subsequent file
|
||
* write will fix the problem.
|
||
*/
|
||
if (fseeko(container, pos, whence) == 0)
|
||
return 1;
|
||
}
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*++
|
||
* t a p e R e w i n d
|
||
*
|
||
* Rewind the tape.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* None
|
||
*
|
||
--*/
|
||
void tapeRewind(
|
||
FILE *container
|
||
)
|
||
{
|
||
fseeko(container, 0, SEEK_SET);
|
||
}
|
||
|
||
/*++
|
||
* t a p e S k i p F o r w a r d
|
||
*
|
||
* Skip forward over a number of files. If end-of-media is reached, the skip
|
||
* operation will terminate early.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* count - # of files to skip
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if skip was successful, 0 otherwise
|
||
*
|
||
--*/
|
||
int tapeSkipForward(
|
||
FILE *container,
|
||
unsigned long count
|
||
)
|
||
{
|
||
unsigned long i;
|
||
uint32_t bc;
|
||
|
||
for (i = 0; i < count; i++) {
|
||
/*
|
||
* Peek at the next record. If it's a tape mark or end-of-media there
|
||
* are not more files to skip.
|
||
*/
|
||
switch (tapePeekRecordLength(container)) {
|
||
case ST_FAIL:
|
||
return 0;
|
||
|
||
case ST_TM:
|
||
case ST_EOM:
|
||
return 1;
|
||
}
|
||
/*
|
||
* Skip forward over 1 file.
|
||
*/
|
||
do {
|
||
switch (bc = tapeReadRecordLength(container)) {
|
||
case ST_FAIL:
|
||
return 0;
|
||
|
||
case ST_EOM:
|
||
if (fseeko(container, -sizeof(uint32_t), SEEK_CUR) != 0)
|
||
return 0;
|
||
break;
|
||
}
|
||
} while ((bc != ST_TM) && (bc != ST_EOM));
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
/*++
|
||
* t a p e S k i p R e v e r s e
|
||
*
|
||
* Skip backwards over a number of files. If beginning-of-tape is reached,
|
||
* the skip operation will terminate early.
|
||
*
|
||
* Inputs:
|
||
*
|
||
* container - pointer open container file
|
||
* count - # of files to skip
|
||
*
|
||
* Outputs:
|
||
*
|
||
* None
|
||
*
|
||
* Returns:
|
||
*
|
||
* 1 if skip was successful, 0 otherwise
|
||
*
|
||
--*/
|
||
int tapeSkipReverse(
|
||
FILE *container,
|
||
unsigned long count
|
||
)
|
||
{
|
||
unsigned long i;
|
||
uint32_t bc;
|
||
|
||
for (i = 0; i < count; i++) {
|
||
/*
|
||
* If we are at beginning-of-tape, there are no more files to skip.
|
||
*/
|
||
if (ftello(container) == 0)
|
||
return 1;
|
||
|
||
/*
|
||
* If we are not at the beginning of tape, the previous record should
|
||
* be a tape mark.
|
||
*/
|
||
if (tapeReadRecordLengthReverse(container) != ST_TM)
|
||
return 0;
|
||
|
||
/*
|
||
* Now skip over the remainder of the file.
|
||
*/
|
||
do {
|
||
if ((bc = tapeReadRecordLengthReverse(container)) == ST_FAIL)
|
||
return 0;
|
||
} while ((bc != ST_TM) && (ftello(container) != 0));
|
||
|
||
/*
|
||
* Skip over the tape mark since it marks the end of the previous file.
|
||
*/
|
||
if (bc == ST_TM) {
|
||
if (fseeko(container, sizeof(uint32_t), SEEK_CUR) != 0)
|
||
return 0;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|