250 lines
10 KiB
C
250 lines
10 KiB
C
/*-
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* Copyright (c) 1992 Keith Muller.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)pax.h 8.2 (Berkeley) 4/18/94
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* $FreeBSD$
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*/
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/*
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* BSD PAX global data structures and constants.
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*/
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#define MAXBLK 64512 /* MAX blocksize supported (posix SPEC) */
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/* WARNING: increasing MAXBLK past 32256 */
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/* will violate posix spec. */
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#define MAXBLK_POSIX 32256 /* MAX blocksize supported as per POSIX */
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#define BLKMULT 512 /* blocksize must be even mult of 512 bytes */
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/* Don't even think of changing this */
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#define DEVBLK 8192 /* default read blksize for devices */
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#define FILEBLK 10240 /* default read blksize for files */
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#define PAXPATHLEN 3072 /* maximum path length for pax. MUST be */
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/* longer than the system PATH_MAX */
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/*
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* Pax modes of operation
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*/
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#define LIST 0 /* List the file in an archive */
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#define EXTRACT 1 /* extract the files in an archive */
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#define ARCHIVE 2 /* write a new archive */
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#define APPND 3 /* append to the end of an archive */
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#define COPY 4 /* copy files to destination dir */
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#define DEFOP LIST /* if no flags default is to LIST */
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/*
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* Device type of the current archive volume
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*/
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#define ISREG 0 /* regular file */
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#define ISCHR 1 /* character device */
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#define ISBLK 2 /* block device */
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#define ISTAPE 3 /* tape drive */
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#define ISPIPE 4 /* pipe/socket */
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typedef struct archd ARCHD;
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typedef struct fsub FSUB;
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typedef struct oplist OPLIST;
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typedef struct pattern PATTERN;
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/*
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* Format Specific Routine Table
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*
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* The format specific routine table allows new archive formats to be quickly
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* added. Overall pax operation is independent of the actual format used to
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* form the archive. Only those routines which deal directly with the archive
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* are tailored to the oddities of the specific format. All other routines are
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* independent of the archive format. Data flow in and out of the format
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* dependent routines pass pointers to ARCHD structure (described below).
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*/
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struct fsub {
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const char *name; /* name of format, this is the name the user */
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/* gives to -x option to select it. */
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int bsz; /* default block size. used when the user */
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/* does not specify a blocksize for writing */
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/* Appends continue to with the blocksize */
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/* the archive is currently using. */
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int hsz; /* Header size in bytes. this is the size of */
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/* the smallest header this format supports. */
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/* Headers are assumed to fit in a BLKMULT. */
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/* If they are bigger, get_head() and */
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/* get_arc() must be adjusted */
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int udev; /* does append require unique dev/ino? some */
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/* formats use the device and inode fields */
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/* to specify hard links. when members in */
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/* the archive have the same inode/dev they */
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/* are assumed to be hard links. During */
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/* append we may have to generate unique ids */
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/* to avoid creating incorrect hard links */
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int hlk; /* does archive store hard links info? if */
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/* not, we do not bother to look for them */
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/* during archive write operations */
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int blkalgn; /* writes must be aligned to blkalgn boundary */
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int inhead; /* is the trailer encoded in a valid header? */
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/* if not, trailers are assumed to be found */
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/* in invalid headers (i.e like tar) */
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int (*id)(char *, int); /* checks if a buffer is a valid header */
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/* returns 1 if it is, o.w. returns a 0 */
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int (*st_rd)(void); /* initialize routine for read. so format */
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/* can set up tables etc before it starts */
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/* reading an archive */
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int (*rd)(ARCHD *, char *);
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/* read header routine. passed a pointer to */
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/* ARCHD. It must extract the info from the */
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/* format and store it in the ARCHD struct. */
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/* This routine is expected to fill all the */
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/* fields in the ARCHD (including stat buf) */
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/* 0 is returned when a valid header is */
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/* found. -1 when not valid. This routine */
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/* set the skip and pad fields so the format */
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/* independent routines know the amount of */
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/* padding and the number of bytes of data */
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/* which follow the header. This info is */
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/* used skip to the next file header */
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off_t (*end_rd)(void); /* read cleanup. Allows format to clean up */
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/* and MUST RETURN THE LENGTH OF THE TRAILER */
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/* RECORD (so append knows how many bytes */
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/* to move back to rewrite the trailer) */
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int (*st_wr)(void); /* initialize routine for write operations */
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int (*wr)(ARCHD *); /* write archive header. Passed an ARCHD */
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/* filled with the specs on the next file to */
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/* archived. Returns a 1 if no file data is */
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/* is to be stored; 0 if file data is to be */
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/* added. A -1 is returned if a write */
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/* operation to the archive failed. this */
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/* function sets the skip and pad fields so */
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/* the proper padding can be added after */
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/* file data. This routine must NEVER write */
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/* a flawed archive header. */
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int (*end_wr)(void); /* end write. write the trailer and do any */
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/* other format specific functions needed */
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/* at the end of an archive write */
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int (*trail_cpio)(ARCHD *);
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int (*trail_tar)(char *, int, int *);
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/* returns 0 if a valid trailer, -1 if not */
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/* For formats which encode the trailer */
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/* outside of a valid header, a return value */
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/* of 1 indicates that the block passed to */
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/* it can never contain a valid header (skip */
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/* this block, no point in looking at it) */
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int (*rd_data)(ARCHD *, int, off_t *);
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/* read/process file data from the archive */
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int (*wr_data)(ARCHD *, int, off_t *);
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/* write/process file data to the archive */
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int (*options)(void); /* process format specific options (-o) */
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};
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/*
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* Pattern matching structure
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*
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* Used to store command line patterns
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*/
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struct pattern {
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char *pstr; /* pattern to match, user supplied */
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char *pend; /* end of a prefix match */
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char *chdname; /* the dir to change to if not NULL. */
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int plen; /* length of pstr */
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int flgs; /* processing/state flags */
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#define MTCH 0x1 /* pattern has been matched */
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#define DIR_MTCH 0x2 /* pattern matched a directory */
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struct pattern *fow; /* next pattern */
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};
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/*
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* General Archive Structure (used internal to pax)
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*
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* This structure is used to pass information about archive members between
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* the format independent routines and the format specific routines. When
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* new archive formats are added, they must accept requests and supply info
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* encoded in a structure of this type. The name fields are declared statically
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* here, as there is only ONE of these floating around, size is not a major
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* consideration. Eventually converting the name fields to a dynamic length
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* may be required if and when the supporting operating system removes all
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* restrictions on the length of pathnames it will resolve.
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*/
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struct archd {
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int nlen; /* file name length */
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char name[PAXPATHLEN+1]; /* file name */
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int ln_nlen; /* link name length */
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char ln_name[PAXPATHLEN+1]; /* name to link to (if any) */
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char *org_name; /* orig name in file system */
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PATTERN *pat; /* ptr to pattern match (if any) */
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struct stat sb; /* stat buffer see stat(2) */
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off_t pad; /* bytes of padding after file xfer */
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off_t skip; /* bytes of real data after header */
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/* IMPORTANT. The st_size field does */
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/* not always indicate the amount of */
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/* data following the header. */
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u_long crc; /* file crc */
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int type; /* type of file node */
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#define PAX_DIR 1 /* directory */
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#define PAX_CHR 2 /* character device */
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#define PAX_BLK 3 /* block device */
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#define PAX_REG 4 /* regular file */
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#define PAX_SLK 5 /* symbolic link */
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#define PAX_SCK 6 /* socket */
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#define PAX_FIF 7 /* fifo */
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#define PAX_HLK 8 /* hard link */
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#define PAX_HRG 9 /* hard link to a regular file */
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#define PAX_CTG 10 /* high performance file */
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};
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/*
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* Format Specific Options List
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*
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* Used to pass format options to the format options handler
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*/
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struct oplist {
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char *name; /* option variable name e.g. name= */
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char *value; /* value for option variable */
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struct oplist *fow; /* next option */
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};
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/*
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* General Macros
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*/
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#ifndef MIN
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#endif
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#define MAJOR(x) major(x)
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#define MINOR(x) minor(x)
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#define TODEV(x, y) makedev((x), (y))
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/*
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* General Defines
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*/
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#define HEX 16
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#define OCT 8
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#define _PAX_ 1
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#define _TFILE_BASE "paxXXXXXXXXXX"
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