/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* Programmer:	Robb Matzke <matzke@llnl.gov>
 *		Friday, July 24, 1998
 *
 * Purpose:	The object modification time message.
 */

#define H5O_PACKAGE		/*suppress error about including H5Opkg	  */

#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free lists                           */
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Opkg.h"             /* Object headers			*/


static void *H5O_mtime_new_decode(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
    unsigned mesg_flags, unsigned *ioflags, const uint8_t *p);
static herr_t H5O_mtime_new_encode(H5F_t *f, hbool_t disable_shared, uint8_t *p, const void *_mesg);
static size_t H5O_mtime_new_size(const H5F_t *f, hbool_t disable_shared, const void *_mesg);

static void *H5O_mtime_decode(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
    unsigned mesg_flags, unsigned *ioflags, const uint8_t *p);
static herr_t H5O_mtime_encode(H5F_t *f, hbool_t disable_shared, uint8_t *p, const void *_mesg);
static void *H5O_mtime_copy(const void *_mesg, void *_dest);
static size_t H5O_mtime_size(const H5F_t *f, hbool_t disable_shared, const void *_mesg);
static herr_t H5O_mtime_reset(void *_mesg);
static herr_t H5O_mtime_free(void *_mesg);
static herr_t H5O_mtime_debug(H5F_t *f, hid_t dxpl_id, const void *_mesg, FILE *stream,
			     int indent, int fwidth);

/* This message derives from H5O message class */
const H5O_msg_class_t H5O_MSG_MTIME[1] = {{
    H5O_MTIME_ID,		/*message id number		*/
    "mtime",			/*message name for debugging	*/
    sizeof(time_t),		/*native message size		*/
    0,				/* messages are sharable?       */
    H5O_mtime_decode,		/*decode message		*/
    H5O_mtime_encode,		/*encode message		*/
    H5O_mtime_copy,		/*copy the native value		*/
    H5O_mtime_size,		/*raw message size		*/
    H5O_mtime_reset,		/* reset method			*/
    H5O_mtime_free,		/* free method			*/
    NULL,		        /* file delete method		*/
    NULL,			/* link method			*/
    NULL,			/*set share method		*/
    NULL,		    	/*can share method		*/
    NULL,			/* pre copy native value to file */
    NULL,			/* copy native value to file    */
    NULL,			/* post copy native value to file    */
    NULL,			/* get creation index		*/
    NULL,			/* set creation index		*/
    H5O_mtime_debug		/*debug the message		*/
}};

/* This message derives from H5O message class */
/* (Only encode, decode & size routines are different from old mtime routines) */
const H5O_msg_class_t H5O_MSG_MTIME_NEW[1] = {{
    H5O_MTIME_NEW_ID,		/*message id number		*/
    "mtime_new",		/*message name for debugging	*/
    sizeof(time_t),		/*native message size		*/
    0,				/* messages are sharable?       */
    H5O_mtime_new_decode,	/*decode message		*/
    H5O_mtime_new_encode,	/*encode message		*/
    H5O_mtime_copy,		/*copy the native value		*/
    H5O_mtime_new_size,		/*raw message size		*/
    H5O_mtime_reset,		/* reset method			*/
    H5O_mtime_free,		/* free method			*/
    NULL,		        /* file delete method		*/
    NULL,			/* link method			*/
    NULL,			/*set share method		*/
    NULL,		    	/*can share method		*/
    NULL,			/* pre copy native value to file */
    NULL,			/* copy native value to file    */
    NULL,			/* post copy native value to file    */
    NULL,			/* get creation index		*/
    NULL,			/* set creation index		*/
    H5O_mtime_debug		/*debug the message		*/
}};

/* Current version of new mtime information */
#define H5O_MTIME_VERSION 	1

/* Track whether tzset routine was called */
static hbool_t ntzset = FALSE;

/* Declare a free list to manage the time_t struct */
H5FL_DEFINE(time_t);


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_new_decode
 *
 * Purpose:	Decode a new modification time message and return a pointer to a
 *		new time_t value.
 *
 * Return:	Success:	Ptr to new message in native struct.
 *
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Jan  3 2002
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_mtime_new_decode(H5F_t H5_ATTR_UNUSED *f, hid_t H5_ATTR_UNUSED dxpl_id, H5O_t H5_ATTR_UNUSED *open_oh,
    unsigned H5_ATTR_UNUSED mesg_flags, unsigned H5_ATTR_UNUSED *ioflags, const uint8_t *p)
{
    time_t	*mesg;
    uint32_t    tmp_time;       /* Temporary copy of the time */
    void        *ret_value;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* check args */
    assert(f);
    assert(p);

    /* decode */
    if(*p++ != H5O_MTIME_VERSION)
        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "bad version number for mtime message");

    /* Skip reserved bytes */
    p+=3;

    /* Get the time_t from the file */
    UINT32DECODE(p, tmp_time);

    /* The return value */
    if (NULL==(mesg = H5FL_MALLOC(time_t)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
    *mesg = (time_t)tmp_time;

    /* Set return value */
    ret_value=mesg;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_mtime_new_decode() */


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_decode
 *
 * Purpose:	Decode a modification time message and return a pointer to a
 *		new time_t value.
 *
 * Return:	Success:	Ptr to new message in native struct.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Jul 24 1998
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_mtime_decode(H5F_t H5_ATTR_UNUSED *f, hid_t H5_ATTR_UNUSED dxpl_id, H5O_t H5_ATTR_UNUSED *open_oh,
    unsigned H5_ATTR_UNUSED mesg_flags, unsigned H5_ATTR_UNUSED *ioflags, const uint8_t *p)
{
    time_t	*mesg, the_time;
    int	i;
    struct tm	tm;
    void        *ret_value = NULL;      /* Return value */
#if _MSC_VER >= 1900 /* VS 2015 */
    /* In gcc and in Visual Studio prior to VS 2015 'timezone' is a global
     * variable declared in time.h. That variable was deprecated and in VS 2015
     * is removed, with _get_timezone replacing it.
     */
    long timezone = 0;
#endif

    FUNC_ENTER_NOAPI_NOINIT

    /* check args */
    HDassert(f);
    HDassert(p);

    /* Initialize time zone information */
    if(!ntzset) {
        HDtzset();
        ntzset = TRUE;
    } /* end if */

    /* decode */
    for(i = 0; i < 14; i++)
        if(!HDisdigit(p[i]))
            HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, NULL, "badly formatted modification time message")

    /*
     * Convert YYYYMMDDhhmmss UTC to a time_t.  This is a little problematic
     * because mktime() operates on local times.  We convert to local time
     * and then figure out the adjustment based on the local time zone and
     * daylight savings setting.
     */
    HDmemset(&tm, 0, sizeof tm);
    tm.tm_year = (p[0]-'0')*1000 + (p[1]-'0')*100 +
		 (p[2]-'0')*10 + (p[3]-'0') - 1900;
    tm.tm_mon = (p[4]-'0')*10 + (p[5]-'0') - 1;
    tm.tm_mday = (p[6]-'0')*10 + (p[7]-'0');
    tm.tm_hour = (p[8]-'0')*10 + (p[9]-'0');
    tm.tm_min = (p[10]-'0')*10 + (p[11]-'0');
    tm.tm_sec = (p[12]-'0')*10 + (p[13]-'0');
    tm.tm_isdst = -1; /*figure it out*/
    if((time_t)-1 == (the_time = HDmktime(&tm)))
        HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, NULL, "badly formatted modification time message")

#if defined(H5_HAVE_TM_GMTOFF)
    /* BSD-like systems */
    the_time += tm.tm_gmtoff;
#elif defined(H5_HAVE_TIMEZONE)
    #if _MSC_VER >= 1900  /* VS 2015 */
        HDget_timezone(&timezone);
    #endif
    /* GNU/Linux systems */
    the_time -= timezone - (tm.tm_isdst ? 3600 : 0);
#else
    /*
     * The catch-all.  If we can't convert a character string universal
     * coordinated time to a time_t value reliably then we can't decode the
     * modification time message. This really isn't as bad as it sounds -- the
     * only way a user can get the modification time is from our internal
     * query routines, which can gracefully recover.
     */
    HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, NULL, "unable to obtain local timezone information")
#endif

    /* The return value */
    if(NULL == (mesg = H5FL_MALLOC(time_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
    *mesg = the_time;

    /* Set return value */
    ret_value = mesg;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5O_mtime_decode() */


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_new_encode
 *
 * Purpose:	Encodes a new modification time message.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Jan  3 2002
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_mtime_new_encode(H5F_t H5_ATTR_UNUSED *f, hbool_t H5_ATTR_UNUSED disable_shared, uint8_t *p, const void *_mesg)
{
    const time_t	*mesg = (const time_t *) _mesg;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* check args */
    assert(f);
    assert(p);
    assert(mesg);

    /* Version */
    *p++ = H5O_MTIME_VERSION;

    /* Reserved bytes */
    *p++ = 0;
    *p++ = 0;
    *p++ = 0;

    /* Encode time */
    UINT32ENCODE(p, *mesg);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_mtime_new_encode() */


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_encode
 *
 * Purpose:	Encodes a modification time message.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Jul 24 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_mtime_encode(H5F_t H5_ATTR_UNUSED *f, hbool_t H5_ATTR_UNUSED disable_shared, uint8_t *p, const void *_mesg)
{
    const time_t	*mesg = (const time_t *) _mesg;
    struct tm		*tm;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* check args */
    assert(f);
    assert(p);
    assert(mesg);

    /* encode */
    tm = HDgmtime(mesg);
    sprintf((char*)p, "%04d%02d%02d%02d%02d%02d",
	    1900+tm->tm_year, 1+tm->tm_mon, tm->tm_mday,
	    tm->tm_hour, tm->tm_min, tm->tm_sec);

    FUNC_LEAVE_NOAPI(SUCCEED)
}


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_copy
 *
 * Purpose:	Copies a message from _MESG to _DEST, allocating _DEST if
 *		necessary.
 *
 * Return:	Success:	Ptr to _DEST
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Jul 24 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void *
H5O_mtime_copy(const void *_mesg, void *_dest)
{
    const time_t	*mesg = (const time_t *) _mesg;
    time_t		*dest = (time_t *) _dest;
    void        *ret_value;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* check args */
    assert(mesg);
    if (!dest && NULL==(dest = H5FL_MALLOC(time_t)))
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");

    /* copy */
    *dest = *mesg;

    /* Set return value */
    ret_value=dest;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_new_size
 *
 * Purpose:	Returns the size of the raw message in bytes not
 *		counting the message type or size fields, but only the data
 *		fields.	 This function doesn't take into account
 *		alignment.
 *
 * Return:	Success:	Message data size in bytes w/o alignment.
 *
 *		Failure:	0
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Jan  3 2002
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5O_mtime_new_size(const H5F_t H5_ATTR_UNUSED * f, hbool_t H5_ATTR_UNUSED disable_shared, const void H5_ATTR_UNUSED * mesg)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* check args */
    assert(f);
    assert(mesg);

    FUNC_LEAVE_NOAPI(8)
} /* end H5O_mtime_new_size() */


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_size
 *
 * Purpose:	Returns the size of the raw message in bytes not
 *		counting the message type or size fields, but only the data
 *		fields.	 This function doesn't take into account
 *		alignment.
 *
 * Return:	Success:	Message data size in bytes w/o alignment.
 *
 *		Failure:	0
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Jul 14 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5O_mtime_size(const H5F_t H5_ATTR_UNUSED * f, hbool_t H5_ATTR_UNUSED disable_shared, const void H5_ATTR_UNUSED * mesg)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* check args */
    assert(f);
    assert(mesg);

    FUNC_LEAVE_NOAPI(16)
}


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_reset
 *
 * Purpose:	Frees resources within a modification time message, but doesn't free
 *		the message itself.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Mondey, December 23, 2002
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_mtime_reset(void H5_ATTR_UNUSED *_mesg)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    FUNC_LEAVE_NOAPI(SUCCEED)
}


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_free
 *
 * Purpose:	Free's the message
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Thursday, March 30, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_mtime_free(void *mesg)
{
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    HDassert(mesg);

    mesg = H5FL_FREE(time_t, mesg);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5O_mtime_free() */


/*-------------------------------------------------------------------------
 * Function:	H5O_mtime_debug
 *
 * Purpose:	Prints debugging info for the message.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Jul 24 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5O_mtime_debug(H5F_t H5_ATTR_UNUSED *f, hid_t H5_ATTR_UNUSED dxpl_id, const void *_mesg, FILE *stream,
		int indent, int fwidth)
{
    const time_t	*mesg = (const time_t *)_mesg;
    struct tm		*tm;
    char		buf[128];

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* check args */
    assert(f);
    assert(mesg);
    assert(stream);
    assert(indent >= 0);
    assert(fwidth >= 0);

    /* debug */
    tm = HDlocaltime(mesg);

    HDstrftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S %Z", tm);
    fprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
	    "Time:", buf);

    FUNC_LEAVE_NOAPI(SUCCEED)
}

