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