/* * Copyright (C) 1998 NCSA * All rights reserved. * * 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. */ #include <ctype.h> #include <errno.h> #include <fcntl.h> #include <hdf5.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/stat.h> #include <unistd.h> #define FALSE 0 #define TRUE 1 #define NAMELEN 4096 #define GB *1024*1024*1024 #define MIN(X,Y) ((X)<(Y)?(X):(Y)) #define MIN3(X,Y,Z) MIN(MIN(X,Y),Z) /*------------------------------------------------------------------------- * 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 [-[b|m] N[g|m|k]] SRC DST\n", progname); 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, " 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 (1); } /*------------------------------------------------------------------------- * 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; char *suffix; if (isdigit (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? */ struct stat sb; /*temporary file stat buffer */ int verbose=FALSE; /*display file names? */ size_t left_overs=0; /*amount of zeros left over */ const char *src_gen_name; /*general source name */ char src_name[NAMELEN]; /*source member name */ off_t src_offset=0; /*offset in source member */ int src_is_family; /*is source name a family name? */ int src_membno=0; /*source member number */ off_t src_size; /*source logical member size */ off_t src_act_size; /*source actual member size */ const char *dst_gen_name; /*general destination name */ char dst_name[NAMELEN]; /*destination member name */ off_t dst_offset=0; /*offset in destination member */ int dst_is_family; /*is dst name a family name? */ int dst_membno=0; /*destination member number */ off_t dst_size=1 GB; /*destination logical memb size */ /* * 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 ('b'==argv[argno][1]) { blk_size = 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); } } /* * 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=open (src_name, O_RDONLY))<0) { perror (src_name); exit (1); } if (fstat (src, &sb)<0) { perror ("fstat"); exit (1); } 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=open (dst_name, O_RDWR|O_CREAT|O_TRUNC, 0666))<0) { perror (dst_name); exit (1); } 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 = malloc (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 = MIN (n, left_overs); left_overs -= 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=read (src, buf, n))<0) { perror ("read"); exit (1); } else if ((size_t)nio!=n) { fprintf (stderr, "%s: short read\n", src_name); exit (1); } 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 && lseek (dst, dst_offset, SEEK_SET)<0) { perror ("lseek"); exit (1); } if ((nio=write (dst, buf, n))<0) { perror ("write"); exit (1); } else if ((size_t)nio!=n) { fprintf (stderr, "%s: short write\n", dst_name); exit (1); } 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 += n; if (src_offset==src_act_size) { close (src); if (!src_is_family) { dst_offset += n; break; } sprintf (src_name, src_gen_name, ++src_membno); if ((src=open (src_name, O_RDONLY))<0 && ENOENT==errno) { dst_offset += n; break; } else if (src<0) { perror (src_name); exit (1); } if (fstat (src, &sb)<0) { perror ("fstat"); exit (1); } 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 += n; if (dst_is_family && dst_offset==dst_size) { if (0==dst_membno) { if (lseek (dst, dst_size-1, SEEK_SET)<0) { perror ("lseek"); exit (1); } if (read (dst, buf, 1)<0) { perror ("read"); exit (1); } if (lseek (dst, dst_size-1, SEEK_SET)<0) { perror ("lseek"); exit (1); } if (write (dst, buf, 1)<0) { perror ("write"); exit (1); } } close (dst); sprintf (dst_name, dst_gen_name, ++dst_membno); if ((dst=open (dst_name, O_RDWR|O_CREAT|O_TRUNC, 0666))<0) { perror (dst_name); exit (1); } 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 (lseek (dst, dst_offset-1, SEEK_SET)<0) { perror ("lseek"); exit (1); } if (read (dst, buf, 1)<0) { perror ("read"); exit (1); } if (lseek (dst, dst_offset-1, SEEK_SET)<0) { perror ("lseek"); exit (1); } if (write (dst, buf, 1)<0) { perror ("write"); exit (1); } } close (dst); /* Free resources and return */ free (buf); return 0; }