/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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>
 *              Wednesday, May 13, 1998
 *
 * Purpose:	Repartitions a file family.  This program can be used to
 *		split a single file into a family of files, join a family of
 *		files into a single file, or copy one family to another while
 *		changing the size of the family members.  It can also be used
 *		to copy a single file to a single file with holes.
 */

/* See H5private.h for how to include system headers */
#include "hdf5.h"
#include "H5private.h"

#define NAMELEN	4096
#define GB	*1024*1024*1024

/* Make these 2 private properties(defined in H5Fprivate.h) available to h5repart.
 * The first one updates the member file size in the superblock.  The second one
 * change file driver from family to a single file driver.
 */
#define H5F_ACS_FAMILY_NEWSIZE_NAME            "family_newsize"
#define H5F_ACS_FAMILY_TO_SINGLE_NAME          "family_to_single"


/*-------------------------------------------------------------------------
 * Function:	usage
 *
 * Purpose:	Prints a usage message.
 *
 * Return:	void
 *
 * Programmer:	Robb Matzke
 *              Wednesday, May 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void
usage (const char *progname)
{
    fprintf(stderr, "usage: %s [-v] [-V] [-[b|m] N[g|m|k]] [-family_to_sec2|-family_to_single] SRC DST\n",
	    progname);
    fprintf(stderr, "   -v     Produce verbose output\n");
    fprintf(stderr, "   -V     Print a version number and exit\n");
    fprintf(stderr, "   -b N   The I/O block size, defaults to 1kB\n");
    fprintf(stderr, "   -m N   The destination member size or 1GB\n");
    fprintf(stderr, "   -family_to_sec2   Deprecated version of -family_to_single (below)\n");
    fprintf(stderr, "   -family_to_single   Change file driver from family to the default single-file VFD (windows or sec2)\n");
    fprintf(stderr, "   SRC    The name of the source file\n");
    fprintf(stderr, "   DST	The name of the destination files\n");
    fprintf(stderr, "Sizes may be suffixed with `g' for GB, `m' for MB or "
	    "`k' for kB.\n");
    fprintf(stderr, "File family names include an integer printf "
	    "format such as `%%d'\n");
    exit (EXIT_FAILURE);
}


/*-------------------------------------------------------------------------
 * Function:	get_size
 *
 * Purpose:	Reads a size option of the form `-XNS' where `X' is any
 *		letter, `N' is a multi-character positive decimal number, and
 *		`S' is an optional suffix letter in the set [GgMmk].  The
 *		option may also be split among two arguments as: `-X NS'.
 *		The input value of ARGNO is the argument number for the
 *		switch in the ARGV vector and ARGC is the number of entries
 *		in that vector.
 *
 * Return:	Success:	The value N multiplied according to the
 *				suffix S.  On return ARGNO will be the number
 *				of the next argument to process.
 *
 *		Failure:	Calls usage() which exits with a non-zero
 *				status.
 *
 * Programmer:	Robb Matzke
 *              Wednesday, May 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static off_t
get_size (const char *progname, int *argno, int argc, char *argv[])
{
    off_t	retval=-1;
    char	*suffix;

    if (isdigit ((int)(argv[*argno][2]))) {
	retval = strtol (argv[*argno]+2, &suffix, 10);
	(*argno)++;
    } else if (argv[*argno][2] || *argno+1>=argc) {
	usage (progname);
    } else {
	retval = strtol (argv[*argno+1], &suffix, 0);
	if (suffix==argv[*argno+1]) usage (progname);
	*argno += 2;
    }
    if (suffix && suffix[0] && !suffix[1]) {
	switch (*suffix) {
	case 'G':
	case 'g':
	    retval *= 1024 * 1024 * 1024;
	    break;
	case 'M':
	case 'm':
	    retval *= 1024 * 1024;
	    break;
	case 'k':
	    retval *= 1024;
	    break;
	default:
	    usage (progname);
	}
    } else if (suffix && suffix[0]) {
	usage (progname);
    }
    return retval;
}


/*-------------------------------------------------------------------------
 * Function:	main
 *
 * Purpose:	Split an hdf5 file
 *
 * Return:	Success:
 *
 *		Failure:
 *
 * Programmer:	Robb Matzke
 *              Wednesday, May 13, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
int
main (int argc, char *argv[])
{
    const char	*prog_name;		/*program name			*/
    size_t	blk_size=1024;		/*size of each I/O block	*/
    char	*buf=NULL;		/*I/O block buffer		*/
    size_t	n, i;			/*counters			*/
    ssize_t	nio;			/*I/O return value		*/
    int		argno=1;		/*program argument number	*/
    int		src, dst=-1;		/*source & destination files	*/
    int		need_seek=FALSE;	/*destination needs to seek?	*/
    int		need_write;		/*data needs to be written?	*/
    h5_stat_t sb;                       /*temporary file stat buffer	*/

    int		verbose=FALSE;		/*display file names?		*/

    const char	*src_gen_name;  /*general source name		*/
    char	*src_name=NULL;	    /*source member name		*/

    int		src_is_family;		/*is source name a family name?	*/
    int		src_membno=0;		/*source member number		*/

    const char	*dst_gen_name;	/*general destination name	*/
    char	*dst_name=NULL;	    /*destination member name	*/
    int		dst_is_family;		/*is dst name a family name?	*/
    int		dst_membno=0;		/*destination member number	*/

    off_t	left_overs=0;		/*amount of zeros left over	*/
    off_t	src_offset=0;		/*offset in source member	*/
    off_t	dst_offset=0;		/*offset in destination member	*/
    off_t	src_size;           /*source logical member size	*/
    off_t	src_act_size;		/*source actual member size	*/
    off_t	dst_size=1 GB;		/*destination logical memb size	*/
    hid_t       fapl;                   /*file access property list     */
    hid_t       file;
    hsize_t     hdsize;                 /*destination logical memb size */
    hbool_t     family_to_single = FALSE;   /*change family to single file driver? */

    /*
     * Get the program name from argv[0]. Use only the last component.
     */
    if ((prog_name=strrchr (argv[0], '/'))) prog_name++;
    else prog_name = argv[0];

    /*
     * Parse switches.
     */
    while (argno<argc && '-'==argv[argno][0]) {
        if (!strcmp (argv[argno], "-v")) {
            verbose = TRUE;
            argno++;
        } else if (!strcmp(argv[argno], "-V")) {
            printf("This is %s version %u.%u release %u\n",
                prog_name, H5_VERS_MAJOR, H5_VERS_MINOR, H5_VERS_RELEASE);
            exit(EXIT_SUCCESS);
        } else if (!strcmp (argv[argno], "-family_to_sec2")) {
            family_to_single = TRUE;
            argno++;
        } else if (!strcmp (argv[argno], "-family_to_single")) {
            family_to_single = TRUE;
            argno++;
        } else if ('b'==argv[argno][1]) {
            blk_size = (size_t)get_size (prog_name, &argno, argc, argv);
        } else if ('m'==argv[argno][1]) {
            dst_size = get_size (prog_name, &argno, argc, argv);
        } else {
            usage (prog_name);
        } /* end if */
    } /* end while */

    /* allocate names */
    if(NULL == (src_name = (char *)HDcalloc((size_t)NAMELEN, sizeof(char))))
        exit(EXIT_FAILURE);
    if(NULL == (dst_name = (char *)HDcalloc((size_t)NAMELEN, sizeof(char))))
        exit(EXIT_FAILURE);

    /*
     * Get the name for the source file and open the first member.  The size
     * of the first member determines the logical size of all the members.
     */
    if (argno>=argc) usage (prog_name);
    src_gen_name = argv[argno++];
    sprintf (src_name, src_gen_name, src_membno);
    src_is_family = strcmp (src_name, src_gen_name);

    if ((src = HDopen(src_name, O_RDONLY)) < 0) {
        HDperror(src_name);
        HDexit(EXIT_FAILURE);
    }

    if (HDfstat(src, &sb)<0) {
        perror ("fstat");
        exit (EXIT_FAILURE);
    }
    src_size = src_act_size = sb.st_size;
    if (verbose) fprintf (stderr, "< %s\n", src_name);

    /*
     * Get the name for the destination file and open the first member.
     */
    if (argno>=argc) usage (prog_name);
    dst_gen_name = argv[argno++];
    sprintf (dst_name, dst_gen_name, dst_membno);
    dst_is_family = strcmp (dst_name, dst_gen_name);

    if ((dst = HDopen(dst_name, O_RDWR|O_CREAT|O_TRUNC, H5_POSIX_CREATE_MODE_RW)) < 0) {
        HDperror(dst_name);
        HDexit(EXIT_FAILURE);
    }
    if (verbose) fprintf (stderr, "> %s\n", dst_name);

    /* No more arguments */
    if (argno<argc) usage (prog_name);

    /* Now the real work, split the file */
    buf = (char *)HDmalloc(blk_size);
    while (src_offset<src_size) {

	/* Read a block.  The amount to read is the minimum of:
	 *    1. The I/O block size
	 *    2. What's left to write in the destination member
	 *    3. Left over zeros or what's left in the source member.
	 */
	n = blk_size;
	if (dst_is_family) n = (size_t)MIN((off_t)n, dst_size-dst_offset);
	if (left_overs) {
	    n = (size_t)MIN ((off_t)n, left_overs);
	    left_overs = left_overs - (off_t)n;
	    need_write = FALSE;
	} else if (src_offset<src_act_size) {
	    n = (size_t)MIN ((off_t)n, src_act_size-src_offset);
	    if ((nio=HDread (src, buf, n))<0) {
		perror ("read");
		exit (EXIT_FAILURE);
	    } else if ((size_t)nio!=n) {
		fprintf (stderr, "%s: short read\n", src_name);
		exit (EXIT_FAILURE);
	    }
	    for (i=0; i<n; i++) {
		if (buf[i]) break;
	    }
	    need_write = (i<n);
	} else {
	    n = 0;
	    left_overs = src_size - src_act_size;
	    need_write = FALSE;
	}

	/*
	 * If the block contains non-zero data then write it to the
	 * destination, otherwise just remember that we'll have to do a seek
	 * later in the destination when we finally get non-zero data.
	 */
	if (need_write) {
	    if (need_seek && HDlseek (dst, dst_offset, SEEK_SET)<0) {
		perror ("HDlseek");
		exit (EXIT_FAILURE);
	    }
	    if ((nio=HDwrite (dst, buf, n))<0) {
		perror ("write");
		exit (EXIT_FAILURE);
	    } else if ((size_t)nio!=n) {
		fprintf (stderr, "%s: short write\n", dst_name);
		exit (EXIT_FAILURE);
	    }
	    need_seek = FALSE;
	} else {
	    need_seek = TRUE;
	}

	/*
	 * Update the source offset and open the next source family member if
	 * necessary.  The source stream ends at the first member which
	 * cannot be opened because it doesn't exist.  At the end of the
	 * source stream, update the destination offset and break out of the
	 * loop.   The destination offset must be updated so we can fix
	 * trailing holes.
	 */
	src_offset = src_offset + (off_t)n;
	if (src_offset==src_act_size) {
	    HDclose (src);
	    if (!src_is_family) {
                dst_offset = dst_offset + (off_t)n;
		break;
	    }
	    sprintf (src_name, src_gen_name, ++src_membno);
	    if ((src = HDopen(src_name, O_RDONLY)) < 0 && ENOENT == errno) {
            dst_offset = dst_offset + (off_t)n;
            break;
	    } else if (src<0) {
		perror (src_name);
		exit (EXIT_FAILURE);
	    }
	    if (HDfstat (src, &sb)<0) {
		perror ("fstat");
		exit (EXIT_FAILURE);
	    }
	    src_act_size = sb.st_size;
	    if (src_act_size>src_size) {
		fprintf (stderr, "%s: member truncated to %lu bytes\n",
			 src_name, (unsigned long)src_size);
	    }
	    src_offset = 0;
	    if (verbose) fprintf (stderr, "< %s\n", src_name);
	}

	/*
	 * Update the destination offset, opening a new member if one will be
	 * needed. The first member is extended to the logical member size
	 * but other members might be smaller if they end with a hole.
	 */
        dst_offset = dst_offset + (off_t)n;
	if (dst_is_family && dst_offset==dst_size) {
	    if (0==dst_membno) {
		if (HDlseek (dst, dst_size-1, SEEK_SET)<0) {
		    perror ("HDHDlseek");
		    exit (EXIT_FAILURE);
		}
		if (HDread (dst, buf, 1)<0) {
		    perror ("read");
		    exit (EXIT_FAILURE);
		}
		if (HDlseek (dst, dst_size-1, SEEK_SET)<0) {
		    perror ("HDlseek");
		    exit (EXIT_FAILURE);
		}
		if (HDwrite (dst, buf, 1)<0) {
		    perror ("write");
		    exit (EXIT_FAILURE);
		}
	    }
	    HDclose (dst);
	    sprintf (dst_name, dst_gen_name, ++dst_membno);
	    if ((dst = HDopen(dst_name, O_RDWR|O_CREAT|O_TRUNC, H5_POSIX_CREATE_MODE_RW)) < 0) {
            HDperror(dst_name);
            HDexit(EXIT_FAILURE);
	    }
	    dst_offset = 0;
	    need_seek = FALSE;
	    if (verbose) fprintf (stderr, "> %s\n", dst_name);
	}
    }

    /*
     * Make sure the last family member is the right size and then close it.
     * The last member can't end with a hole or hdf5 will think that the
     * family has been truncated.
     */
    if (need_seek) {
	if (HDlseek (dst, dst_offset-1, SEEK_SET)<0) {
	    perror ("HDlseek");
	    exit (EXIT_FAILURE);
	}
	if (HDread (dst, buf, 1)<0) {
	    perror ("read");
	    exit (EXIT_FAILURE);
	}
	if (HDlseek (dst, dst_offset-1, SEEK_SET)<0) {
	    perror ("HDlseek");
	    exit (EXIT_FAILURE);
	}
	if (HDwrite (dst, buf, 1)<0) {
	    perror ("write");
	    exit (EXIT_FAILURE);
	}
    }
    HDclose (dst);

    /* Modify family driver information saved in superblock through private property.
     * These private properties are for this tool only. */
    if ((fapl=H5Pcreate(H5P_FILE_ACCESS))<0) {
        perror ("H5Pcreate");
        exit (EXIT_FAILURE);
    }

    if(family_to_single) {
        /* The user wants to change file driver from family to a single-file VFD.
         * Open the file with the sec2, windows, etc. driver. This property signals
         * the library to ignore the family driver information saved in the superblock.
         */
        if(H5Pset(fapl, H5F_ACS_FAMILY_TO_SINGLE_NAME, &family_to_single) < 0) {
            perror ("H5Pset");
            exit (EXIT_FAILURE);
        }
    } else {
        /* Modify family size saved in superblock through private property. It signals
         * library to save the new member size(specified in command line) in superblock.
         * This private property is for this tool only. */
        if(H5Pset_fapl_family(fapl, H5F_FAMILY_DEFAULT, H5P_DEFAULT) < 0) {
            perror ("H5Pset_fapl_family");
            exit (EXIT_FAILURE);
        }

        /* Set the property of the new member size as hsize_t */
        hdsize = (hsize_t)dst_size;
        if(H5Pset(fapl, H5F_ACS_FAMILY_NEWSIZE_NAME, &hdsize) < 0) {
            perror ("H5Pset");
            exit (EXIT_FAILURE);
        }
    }

    /* If the new file is a family file, try to open file for "read and write" to
     * flush metadata. Flushing metadata will update the superblock to the new
     * member size.  If the original file is a family file and the new file is a single
     * file, the property FAMILY_TO_SINGLE will signal the library to switch to default
     * single-file driver when the new file is opened.  If the original file is a single
     * file and the new file can only be a single file, reopen the new file should fail.
     * There's nothing to do in this case.
     */
    H5E_BEGIN_TRY {
        file = H5Fopen(dst_gen_name, H5F_ACC_RDWR, fapl);
    } H5E_END_TRY;

    if(file>=0) {
        if(H5Fclose(file)<0) {
            perror ("H5Fclose");
            exit (EXIT_FAILURE);
        } /* end if */
    } /* end if */

    if(H5Pclose(fapl)<0) {
        perror ("H5Pclose");
        exit (EXIT_FAILURE);
    } /* end if */

    /* Free resources and return */
    HDfree(src_name);
    HDfree(dst_name);
    HDfree(buf);
    return EXIT_SUCCESS;
} /* end main */