bin/pax/pax.h

   1 /*-
   2  * Copyright (c) 1992 Keith Muller.
   3  * Copyright (c) 1992, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Keith Muller of the University of California, San Diego.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)pax.h       8.2 (Berkeley) 4/18/94
  34  * $FreeBSD: src/bin/pax/pax.h,v 1.8.2.1 2001/08/01 05:03:11 obrien Exp $
  35  * $DragonFly: src/bin/pax/pax.h,v 1.3 2006/09/27 21:58:08 pavalos Exp $
  36  */
  37
  38 /*
  39  * BSD PAX global data structures and constants.
  40  */
  41
  42 #define MAXBLK          64512   /* MAX blocksize supported (posix SPEC) */
  43                                 /* WARNING: increasing MAXBLK past 32256 */
  44                                 /* will violate posix spec. */
  45 #define MAXBLK_POSIX    32256   /* MAX blocksize supported as per POSIX */
  46 #define BLKMULT         512     /* blocksize must be even mult of 512 bytes */
  47                                 /* Don't even think of changing this */
  48 #define DEVBLK          8192    /* default read blksize for devices */
  49 #define FILEBLK         10240   /* default read blksize for files */
  50 #define PAXPATHLEN      3072    /* maximum path length for pax. MUST be */
  51                                 /* longer than the system PATH_MAX */
  52
  53 /*
  54  * Pax modes of operation
  55  */
  56 #define LIST            0       /* List the file in an archive */
  57 #define EXTRACT         1       /* extract the files in an archive */
  58 #define ARCHIVE         2       /* write a new archive */
  59 #define APPND           3       /* append to the end of an archive */
  60 #define COPY            4       /* copy files to destination dir */
  61 #define DEFOP           LIST    /* if no flags default is to LIST */
  62
  63 /*
  64  * Device type of the current archive volume
  65  */
  66 #define ISREG           0       /* regular file */
  67 #define ISCHR           1       /* character device */
  68 #define ISBLK           2       /* block device */
  69 #define ISTAPE          3       /* tape drive */
  70 #define ISPIPE          4       /* pipe/socket */
  71
  72 /*
  73  * Format Specific Routine Table
  74  *
  75  * The format specific routine table allows new archive formats to be quickly
  76  * added. Overall pax operation is independent of the actual format used to
  77  * form the archive. Only those routines which deal directly with the archive
  78  * are tailored to the oddities of the specific format. All other routines are
  79  * independent of the archive format. Data flow in and out of the format
  80  * dependent routines pass pointers to ARCHD structure (described below).
  81  */
  82 typedef struct {
  83         char *name;             /* name of format, this is the name the user */
  84                                 /* gives to -x option to select it. */
  85         int bsz;                /* default block size. used when the user */
  86                                 /* does not specify a blocksize for writing */
  87                                 /* Appends continue to with the blocksize */
  88                                 /* the archive is currently using. */
  89         int hsz;                /* Header size in bytes. this is the size of */
  90                                 /* the smallest header this format supports. */
  91                                 /* Headers are assumed to fit in a BLKMULT. */
  92                                 /* If they are bigger, get_head() and */
  93                                 /* get_arc() must be adjusted */
  94         int udev;               /* does append require unique dev/ino? some */
  95                                 /* formats use the device and inode fields */
  96                                 /* to specify hard links. when members in */
  97                                 /* the archive have the same inode/dev they */
  98                                 /* are assumed to be hard links. During */
  99                                 /* append we may have to generate unique ids */
 100                                 /* to avoid creating incorrect hard links */
 101         int hlk;                /* does archive store hard links info? if */
 102                                 /* not, we do not bother to look for them */
 103                                 /* during archive write operations */
 104         int blkalgn;            /* writes must be aligned to blkalgn boundary */
 105         int inhead;             /* is the trailer encoded in a valid header? */
 106                                 /* if not, trailers are assumed to be found */
 107                                 /* in invalid headers (i.e like tar) */
 108         int (*id)();            /* checks if a buffer is a valid header */
 109                                 /* returns 1 if it is, o.w. returns a 0 */
 110         int (*st_rd)();         /* initialize routine for read. so format */
 111                                 /* can set up tables etc before it starts */
 112                                 /* reading an archive */
 113         int (*rd)();            /* read header routine. passed a pointer to */
 114                                 /* ARCHD. It must extract the info from the */
 115                                 /* format and store it in the ARCHD struct. */
 116                                 /* This routine is expected to fill all the */
 117                                 /* fields in the ARCHD (including stat buf) */
 118                                 /* 0 is returned when a valid header is */
 119                                 /* found. -1 when not valid. This routine */
 120                                 /* set the skip and pad fields so the format */
 121                                 /* independent routines know the amount of */
 122                                 /* padding and the number of bytes of data */
 123                                 /* which follow the header. This info is */
 124                                 /* used skip to the next file header */
 125         off_t (*end_rd)();      /* read cleanup. Allows format to clean up */
 126                                 /* and MUST RETURN THE LENGTH OF THE TRAILER */
 127                                 /* RECORD (so append knows how many bytes */
 128                                 /* to move back to rewrite the trailer) */
 129         int (*st_wr)();         /* initialize routine for write operations */
 130         int (*wr)();            /* write archive header. Passed an ARCHD */
 131                                 /* filled with the specs on the next file to */
 132                                 /* archived. Returns a 1 if no file data is */
 133                                 /* is to be stored; 0 if file data is to be */
 134                                 /* added. A -1 is returned if a write */
 135                                 /* operation to the archive failed. this */
 136                                 /* function sets the skip and pad fields so */
 137                                 /* the proper padding can be added after */
 138                                 /* file data. This routine must NEVER write */
 139                                 /* a flawed archive header. */
 140         int (*end_wr)();        /* end write. write the trailer and do any */
 141                                 /* other format specific functions needed */
 142                                 /* at the end of an archive write */
 143         int (*trail)();         /* returns 0 if a valid trailer, -1 if not */
 144                                 /* For formats which encode the trailer */
 145                                 /* outside of a valid header, a return value */
 146                                 /* of 1 indicates that the block passed to */
 147                                 /* it can never contain a valid header (skip */
 148                                 /* this block, no point in looking at it)  */
 149                                 /* CAUTION: parameters to this function are */
 150                                 /* different for trailers inside or outside */
 151                                 /* of headers. See get_head() for details */
 152         int (*rd_data)();       /* read/process file data from the archive */
 153         int (*wr_data)();       /* write/process file data to the archive */
 154         int (*options)();       /* process format specific options (-o) */
 155 } FSUB;
 156
 157 /*
 158  * Pattern matching structure
 159  *
 160  * Used to store command line patterns
 161  */
 162 typedef struct pattern {
 163         char            *pstr;          /* pattern to match, user supplied */
 164         char            *pend;          /* end of a prefix match */
 165         char            *chdname;       /* the dir to change to if not NULL.  */
 166         int             plen;           /* length of pstr */
 167         int             flgs;           /* processing/state flags */
 168 #define MTCH            0x1             /* pattern has been matched */
 169 #define DIR_MTCH        0x2             /* pattern matched a directory */
 170         struct pattern  *fow;           /* next pattern */
 171 } PATTERN;
 172
 173 /*
 174  * General Archive Structure (used internal to pax)
 175  *
 176  * This structure is used to pass information about archive members between
 177  * the format independent routines and the format specific routines. When
 178  * new archive formats are added, they must accept requests and supply info
 179  * encoded in a structure of this type. The name fields are declared statically
 180  * here, as there is only ONE of these floating around, size is not a major
 181  * consideration. Eventually converting the name fields to a dynamic length
 182  * may be required if and when the supporting operating system removes all
 183  * restrictions on the length of pathnames it will resolve.
 184  */
 185 typedef struct {
 186         int nlen;                       /* file name length */
 187         char name[PAXPATHLEN+1];        /* file name */
 188         int ln_nlen;                    /* link name length */
 189         char ln_name[PAXPATHLEN+1];     /* name to link to (if any) */
 190         char *org_name;                 /* orig name in file system */
 191         PATTERN *pat;                   /* ptr to pattern match (if any) */
 192         struct stat sb;                 /* stat buffer see stat(2) */
 193         off_t pad;                      /* bytes of padding after file xfer */
 194         off_t skip;                     /* bytes of real data after header */
 195                                         /* IMPORTANT. The st_size field does */
 196                                         /* not always indicate the amount of */
 197                                         /* data following the header. */
 198         u_long crc;                     /* file crc */
 199         int type;                       /* type of file node */
 200 #define PAX_DIR         1               /* directory */
 201 #define PAX_CHR         2               /* character device */
 202 #define PAX_BLK         3               /* block device */
 203 #define PAX_REG         4               /* regular file */
 204 #define PAX_SLK         5               /* symbolic link */
 205 #define PAX_SCK         6               /* socket */
 206 #define PAX_FIF         7               /* fifo */
 207 #define PAX_HLK         8               /* hard link */
 208 #define PAX_HRG         9               /* hard link to a regular file */
 209 #define PAX_CTG         10              /* high performance file */
 210 } ARCHD;
 211
 212 /*
 213  * Format Specific Options List
 214  *
 215  * Used to pass format options to the format options handler
 216  */
 217 typedef struct oplist {
 218         char            *name;          /* option variable name e.g. name= */
 219         char            *value;         /* value for option variable */
 220         struct oplist   *fow;           /* next option */
 221 } OPLIST;
 222
 223 /*
 224  * General Macros
 225  */
 226 #ifndef MIN
 227 #define        MIN(a,b) (((a)<(b))?(a):(b))
 228 #endif
 229 #define MAJOR(x)        major(x)
 230 #define MINOR(x)        minor(x)
 231 #define TODEV(x, y)     makedev((x), (y))
 232
 233 /*
 234  * General Defines
 235  */
 236 #define HEX             16
 237 #define OCT             8
 238 #define _PAX_           1
 239 #define _TFILE_BASE     "paxXXXXXXXXXX"