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freebsd-dev/lib/libarchive/archive.h
Tim Kientzle b5f1f87711 More cleanup work on permissions restore: 
* Rename some variables/functions/etc to try to make things clearer.
  * Add separate flags to control fflag/acl restore
  * Collect metadata restore into a single function for clarity
  * Propagate errors in metadata restore back out to the client
  * Fix some places where errors were being returned when they
    shouldn't and vice-versa
  * Modes are now always restored; ARCHIVE_EXTRACT_PERM just controls
    whether or not umask is obeyed.
  * Restore suid/sgid bits only if user/group matches archive
  * Cache the last stat results to try to reduce the number of stat calls
2004-06-27 23:27:28 +00:00

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/*-
* Copyright (c) 2003-2004 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef ARCHIVE_H_INCLUDED
#define ARCHIVE_H_INCLUDED
#include <sys/types.h> /* Linux requires this for off_t */
#include <inttypes.h> /* For int64_t */
#include <unistd.h> /* For ssize_t and size_t */
#define ARCHIVE_BYTES_PER_RECORD 512
#define ARCHIVE_DEFAULT_BYTES_PER_BLOCK 10240
/* Declare our basic types. */
struct archive;
struct archive_entry;
/*
* Error codes: Use archive_errno() and archive_error_string()
* to retrieve details. Unless specified otherwise, all functions
* that return 'int' use these codes.
*/
#define ARCHIVE_EOF 1 /* Found end of archive. */
#define ARCHIVE_OK 0 /* Operation was successful. */
#define ARCHIVE_WARN (-1) /* Sucess, but minor problem. */
#define ARCHIVE_RETRY (-2) /* Retry might succeed. */
#define ARCHIVE_FATAL (-3) /* No more operations are possible. */
/*
* As far as possible, archive_errno returns standard platform errno codes.
* Of course, the details vary by platform, so the actual definitions
* here are stored in "archive_platform.h". The symbols are listed here
* for reference; as a rule, clients should not need to know the exact
* platform-dependent error code.
*/
/* Unrecognized or invalid file format. */
/* #define ARCHIVE_ERRNO_FILE_FORMAT */
/* Illegal usage of the library. */
/* #define ARCHIVE_ERRNO_PROGRAMMER_ERROR */
/* Unknown or unclassified error. */
/* #define ARCHIVE_ERRNO_MISC */
/*
* Callbacks are invoked to automatically read/write/open/close the archive.
* You can provide your own for complex tasks (like breaking archives
* across multiple tapes) or use standard ones built into the library.
*/
/* Returns pointer and size of next block of data from archive. */
typedef ssize_t archive_read_callback(struct archive *, void *_client_data,
const void **_buffer);
/* Returns size actually written, zero on EOF, -1 on error. */
typedef ssize_t archive_write_callback(struct archive *, void *_client_data,
void *_buffer, size_t _length);
typedef int archive_open_callback(struct archive *, void *_client_data);
typedef int archive_close_callback(struct archive *, void *_client_data);
/*
* Codes for archive_compression.
*/
#define ARCHIVE_COMPRESSION_NONE 0
#define ARCHIVE_COMPRESSION_GZIP 1
#define ARCHIVE_COMPRESSION_BZIP2 2
#define ARCHIVE_COMPRESSION_COMPRESS 3
/*
* Codes returned by archive_format.
*
* Top 16 bits identifies the format family (e.g., "tar"); lower
* 16 bits indicate the variant. This is updated by read_next_header.
* Note that the lower 16 bits will often vary from entry to entry.
*/
#define ARCHIVE_FORMAT_BASE_MASK 0xff0000U
#define ARCHIVE_FORMAT_CPIO 0x10000
#define ARCHIVE_FORMAT_CPIO_POSIX (ARCHIVE_FORMAT_CPIO | 1)
#define ARCHIVE_FORMAT_SHAR 0x20000
#define ARCHIVE_FORMAT_SHAR_BASE (ARCHIVE_FORMAT_SHAR | 1)
#define ARCHIVE_FORMAT_SHAR_DUMP (ARCHIVE_FORMAT_SHAR | 2)
#define ARCHIVE_FORMAT_TAR 0x30000
#define ARCHIVE_FORMAT_TAR_USTAR (ARCHIVE_FORMAT_TAR | 1)
#define ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE (ARCHIVE_FORMAT_TAR | 2)
#define ARCHIVE_FORMAT_TAR_PAX_RESTRICTED (ARCHIVE_FORMAT_TAR | 3)
#define ARCHIVE_FORMAT_TAR_GNUTAR (ARCHIVE_FORMAT_TAR | 4)
/*-
* Basic outline for reading an archive:
* 1) Ask archive_read_new for an archive reader object.
* 2) Update any global properties as appropriate.
* In particular, you'll certainly want to call appropriate
* archive_read_support_XXX functions.
* 3) Call archive_read_open_XXX to open the archive
* 4) Repeatedly call archive_read_next_header to get information about
* successive archive entries. Call archive_read_data to extract
* data for entries of interest.
* 5) Call archive_read_finish to destroy the object.
*/
struct archive *archive_read_new(void);
/*
* The archive_read_support_XXX calls enable auto-detect for this
* archive handle. They also link in the necessary support code.
* For example, if you don't want bzlib linked in, don't invoke
* support_compression_bzip2(). The "all" functions provide the
* obvious shorthand.
*/
int archive_read_support_compression_all(struct archive *);
int archive_read_support_compression_bzip2(struct archive *);
int archive_read_support_compression_compress(struct archive *);
int archive_read_support_compression_gzip(struct archive *);
int archive_read_support_compression_none(struct archive *);
int archive_read_support_format_all(struct archive *);
int archive_read_support_format_cpio(struct archive *);
int archive_read_support_format_gnutar(struct archive *);
int archive_read_support_format_tar(struct archive *);
/* Open the archive using callbacks for archive I/O. */
int archive_read_open(struct archive *, void *_client_data,
archive_open_callback *, archive_read_callback *,
archive_close_callback *);
/*
* The archive_read_open_file function is a convenience function built
* on archive_read_open that uses a canned callback suitable for
* common situations. Note that a NULL filename indicates stdin.
*/
int archive_read_open_file(struct archive *, const char *_file,
size_t _block_size);
int archive_read_open_fd(struct archive *, int _fd,
size_t _block_size);
/* Parses and returns next entry header. */
int archive_read_next_header(struct archive *,
struct archive_entry **);
/*
* Retrieve the byte offset in UNCOMPRESSED data where last-read
* header started.
*/
int64_t archive_read_header_position(struct archive *);
/* Read data from the body of an entry. Similar to read(2). */
ssize_t archive_read_data(struct archive *, void *, size_t);
/*
* A zero-copy version of archive_read_data that also exposes the file offset
* of each returned block. Note that the client has no way to specify
* the desired size of the block. The API does gaurantee that offsets will
* be strictly increasing and that returned blocks will not overlap.
*/
int archive_read_data_block(struct archive *a,
const void **buff, size_t *size, off_t *offset);
/*-
* Some convenience functions that are built on archive_read_data:
* 'skip': skips entire entry
* 'into_buffer': writes data into memory buffer that you provide
* 'into_fd': writes data to specified filedes
*/
int archive_read_data_skip(struct archive *);
int archive_read_data_into_buffer(struct archive *, void *buffer,
ssize_t len);
int archive_read_data_into_fd(struct archive *, int fd);
/*-
* Convenience function to recreate the current entry (whose header
* has just been read) on disk.
*
* This does quite a bit more than just copy data to disk. It also:
* - Creates intermediate directories as required.
* - Manages directory permissions: non-writable directories will
* be initially created with write permission enabled; when the
* archive is closed, dir permissions are edited to the values specified
* in the archive.
* - Checks hardlinks: hardlinks will not be extracted unless the
* linked-to file was also extracted within the same session. (TODO)
*/
/* The "flags" argument selects optional behavior, 'OR' the flags you want. */
/* TODO: The 'Default' comments here are not quite correct; clean this up. */
#define ARCHIVE_EXTRACT_OWNER (1) /* Default: owner/group not restored */
#define ARCHIVE_EXTRACT_PERM (2) /* Default: restore perm only for reg file*/
#define ARCHIVE_EXTRACT_TIME (4) /* Default: mod time not restored */
#define ARCHIVE_EXTRACT_NO_OVERWRITE (8) /* Default: Replace files on disk */
#define ARCHIVE_EXTRACT_UNLINK (16) /* Default: don't unlink existing files */
#define ARCHIVE_EXTRACT_ACL (32) /* Default: don't restore ACLs */
#define ARCHIVE_EXTRACT_FFLAGS (64) /* Default: don't restore fflags */
int archive_read_extract(struct archive *, struct archive_entry *,
int flags);
void archive_read_extract_set_progress_callback(struct archive *,
void (*_progress_func)(void *), void *_user_data);
/* Close the file, release any resources, and destroy the object. */
void archive_read_finish(struct archive *);
/*-
* To create an archive:
* 1) Ask archive_write_new for a archive writer object.
* 2) Set any global properties. In particular, you should register
* open/write/close callbacks.
* 3) Call archive_write_open to open the file
* 4) For each entry:
* - construct an appropriate struct archive_entry structure
* - archive_write_header to write the header
* - archive_write_data to write the entry data
* 5) archive_write_finish to close the output and cleanup the writer
*/
struct archive *archive_write_new(void);
int archive_write_set_bytes_per_block(struct archive *,
int bytes_per_block);
/* XXX This is badly misnamed; suggestions appreciated. XXX */
int archive_write_set_bytes_in_last_block(struct archive *,
int bytes_in_last_block);
int archive_write_set_compression_bzip2(struct archive *);
int archive_write_set_compression_gzip(struct archive *);
int archive_write_set_compression_none(struct archive *);
/* A convenience function to set the format based on the code or name. */
int archive_write_set_format(struct archive *, int format_code);
int archive_write_set_format_by_name(struct archive *,
const char *name);
/* To minimize link pollution, use one or more of the following. */
int archive_write_set_format_cpio(struct archive *);
/* TODO: int archive_write_set_format_old_tar(struct archive *); */
int archive_write_set_format_pax(struct archive *);
int archive_write_set_format_pax_restricted(struct archive *);
int archive_write_set_format_shar(struct archive *);
int archive_write_set_format_shar_dump(struct archive *);
int archive_write_set_format_ustar(struct archive *);
int archive_write_open(struct archive *, void *,
archive_open_callback *, archive_write_callback *,
archive_close_callback *);
int archive_write_open_fd(struct archive *, int _fd);
int archive_write_open_file(struct archive *, const char *_file);
/*
* Note that the library will truncate writes beyond the size provided
* to archive_write_header or pad if the provided data is short.
*/
int archive_write_header(struct archive *,
struct archive_entry *);
int archive_write_data(struct archive *, const void *, size_t);
void archive_write_finish(struct archive *);
/*
* Accessor functions to read/set various information in
* the struct archive object:
*/
/* Bytes written after compression or read before decompression. */
int64_t archive_position_compressed(struct archive *);
/* Bytes written to compressor or read from decompressor. */
int64_t archive_position_uncompressed(struct archive *);
const char *archive_compression_name(struct archive *);
int archive_compression(struct archive *);
int archive_errno(struct archive *);
const char *archive_error_string(struct archive *);
const char *archive_format_name(struct archive *);
int archive_format(struct archive *);
/* void archive_set_errno(struct archive *, int); */
/* void archive_error_printf(struct archive *, const char *fmt, ...); */
void archive_set_error(struct archive *, int _err, const char *fmt, ...);
#endif /* !ARCHIVE_H_INCLUDED */
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