e791a7a913
in the regular ustar header that are overridden by the pax
extended attributes. As a result, it makes perfect sense to
use numeric extensions in the regular ustar header so that readers
that don't understand pax extensions but do understand some other
extensions can still get useful information out of it.
This is especially important for filesizes, as the failure to
read a file size correctly can get the reader out of sync.
This commit introduces a "non-strict" option into the internal
function to format a ustar header. In non-strict mode, the formatter
will use longer octal values (overwriting terminators) or binary
("base-256") values as needed to ensure that large file sizes,
negative mtimes, etc, have the correct values stored in the regular
ustar header.
241 lines
8.5 KiB
C
241 lines
8.5 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_PRIVATE_H_INCLUDED
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#define ARCHIVE_PRIVATE_H_INCLUDED
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#include <wchar.h>
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#include "archive.h"
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#include "archive_string.h"
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#define ARCHIVE_WRITE_MAGIC (0xb0c5c0deU)
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#define ARCHIVE_READ_MAGIC (0xdeb0c5U)
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struct archive {
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/*
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* The magic/state values are used to sanity-check the
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* client's usage. If an API function is called at a
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* rediculous time, or the client passes us an invalid
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* pointer, these values allow me to catch that.
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*/
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unsigned magic;
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unsigned state;
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struct archive_entry *entry;
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uid_t user_uid; /* UID of current user. */
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/* Dev/ino of the archive being read/written. */
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dev_t skip_file_dev;
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ino_t skip_file_ino;
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/* Utility: Pointer to a block of nulls. */
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const char *nulls;
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size_t null_length;
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/*
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* Used by archive_read_data() to track blocks and copy
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* data to client buffers, filling gaps with zero bytes.
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*/
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const char *read_data_block;
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off_t read_data_offset;
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off_t read_data_output_offset;
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size_t read_data_remaining;
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/* Callbacks to open/read/write/close archive stream. */
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archive_open_callback *client_opener;
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archive_read_callback *client_reader;
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archive_write_callback *client_writer;
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archive_close_callback *client_closer;
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void *client_data;
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/*
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* Blocking information. Note that bytes_in_last_block is
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* misleadingly named; I should find a better name. These
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* control the final output from all compressors, including
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* compression_none.
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*/
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int bytes_per_block;
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int bytes_in_last_block;
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/*
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* These control whether data within a gzip/bzip2 compressed
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* stream gets padded or not. If pad_uncompressed is set,
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* the data will be padded to a full block before being
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* compressed. The pad_uncompressed_byte determines the value
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* that will be used for padding. Note that these have no
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* effect on compression "none."
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*/
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int pad_uncompressed;
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int pad_uncompressed_byte; /* TODO: Support this. */
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/* Position in UNCOMPRESSED data stream. */
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off_t file_position;
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/* Position in COMPRESSED data stream. */
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off_t raw_position;
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/* File offset of beginning of most recently-read header. */
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off_t header_position;
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/*
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* Detection functions for decompression: bid functions are
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* given a block of data from the beginning of the stream and
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* can bid on whether or not they support the data stream.
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* General guideline: bid the number of bits that you actually
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* test, e.g., 16 if you test a 2-byte magic value. The
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* highest bidder will have their init function invoked, which
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* can set up pointers to specific handlers.
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*
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* On write, the client just invokes an archive_write_set function
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* which sets up the data here directly.
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*/
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int compression_code; /* Currently active compression. */
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const char *compression_name;
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struct {
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int (*bid)(const void *buff, size_t);
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int (*init)(struct archive *, const void *buff, size_t);
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} decompressors[4];
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/* Read/write data stream (with compression). */
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void *compression_data; /* Data for (de)compressor. */
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int (*compression_init)(struct archive *); /* Initialize. */
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int (*compression_finish)(struct archive *);
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ssize_t (*compression_write)(struct archive *, const void *, size_t);
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/*
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* Read uses a peek/consume I/O model: the decompression code
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* returns a pointer to the requested block and advances the
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* file position only when requested by a consume call. This
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* reduces copying and also simplifies look-ahead for format
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* detection.
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*/
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ssize_t (*compression_read_ahead)(struct archive *,
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const void **, size_t request);
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ssize_t (*compression_read_consume)(struct archive *, size_t);
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/*
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* Format detection is mostly the same as compression
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* detection, with two significant differences: The bidders
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* use the read_ahead calls above to examine the stream rather
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* than having the supervisor hand them a block of data to
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* examine, and the auction is repeated for every header.
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* Winning bidders should set the archive_format and
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* archive_format_name appropriately. Bid routines should
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* check archive_format and decline to bid if the format of
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* the last header was incompatible.
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*
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* Again, write support is considerably simpler because there's
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* no need for an auction.
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*/
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int archive_format;
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const char *archive_format_name;
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struct archive_format_descriptor {
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int (*bid)(struct archive *);
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int (*read_header)(struct archive *, struct archive_entry *);
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int (*read_data)(struct archive *, const void **, size_t *, off_t *);
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int (*cleanup)(struct archive *);
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void *format_data; /* Format-specific data for readers. */
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} formats[4];
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struct archive_format_descriptor *format; /* Active format. */
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/*
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* Storage for format-specific data. Note that there can be
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* multiple format readers active at one time, so we need to
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* allow for multiple format readers to have their data
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* available. The pformat_data slot here is the solution: on
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* read, it is gauranteed to always point to a void* variable
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* that the format can use.
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*/
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void **pformat_data; /* Pointer to current format_data. */
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void *format_data; /* Used by writers. */
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/*
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* Pointers to format-specific functions for writing. They're
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* initialized by archive_write_set_format_XXX() calls.
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*/
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int (*format_init)(struct archive *); /* Only used on write. */
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int (*format_finish)(struct archive *);
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int (*format_finish_entry)(struct archive *);
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int (*format_write_header)(struct archive *,
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struct archive_entry *);
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int (*format_write_data)(struct archive *,
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const void *buff, size_t);
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/*
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* Various information needed by archive_extract.
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*/
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struct extract *extract;
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void (*extract_progress)(void *);
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void *extract_progress_user_data;
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void (*cleanup_archive_extract)(struct archive *);
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int archive_error_number;
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const char *error;
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struct archive_string error_string;
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};
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/*
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* Utility function to format a USTAR header into a buffer. If
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* "strict" is set, this tries to create the absolutely most portable
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* version of a ustar header. If "strict" is set to 0, then it will
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* relax certain requirements.
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*/
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int
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__archive_write_format_header_ustar(struct archive *, char buff[512],
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struct archive_entry *, int tartype, int strict);
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#define ARCHIVE_STATE_ANY 0xFFFFU
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#define ARCHIVE_STATE_NEW 1U
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#define ARCHIVE_STATE_HEADER 2U
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#define ARCHIVE_STATE_DATA 4U
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#define ARCHIVE_STATE_EOF 8U
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#define ARCHIVE_STATE_CLOSED 0x10U
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#define ARCHIVE_STATE_FATAL 0x8000U
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/* Check magic value and state; exit if it isn't valid. */
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void
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__archive_check_magic(struct archive *, unsigned magic,
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unsigned state, const char *func);
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#define archive_check_magic(a,m,s) \
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__archive_check_magic((a), (m), (s), __func__)
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int __archive_read_register_format(struct archive *a,
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void *format_data,
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int (*bid)(struct archive *),
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int (*read_header)(struct archive *, struct archive_entry *),
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int (*read_data)(struct archive *, const void **, size_t *, off_t *),
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int (*cleanup)(struct archive *));
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int __archive_read_register_compression(struct archive *a,
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int (*bid)(const void *, size_t),
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int (*init)(struct archive *, const void *, size_t));
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#define err_combine(a,b) ((a) < (b) ? (a) : (b))
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#endif
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