136 lines
4.7 KiB
C
136 lines
4.7 KiB
C
/*-
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* Copyright (c) 2003-2007 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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* 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_READ_PRIVATE_H_INCLUDED
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#define ARCHIVE_READ_PRIVATE_H_INCLUDED
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#include "archive.h"
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#include "archive_string.h"
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#include "archive_private.h"
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struct archive_read {
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struct archive archive;
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struct archive_entry *entry;
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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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/*
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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_skip_callback *client_skipper;
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archive_close_callback *client_closer;
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void *client_data;
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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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* Decompressors have a very specific lifecycle:
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* public setup function initializes a slot in this table
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* 'config' holds minimal configuration data
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* bid() examines a block of data and returns a bid [1]
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* init() is called for successful bidder
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* 'data' is initialized by init()
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* read() returns a pointer to the next block of data
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* consume() indicates how much data is used
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* skip() ignores bytes of data
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* finish() cleans up and frees 'data' and 'config'
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*
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* [1] 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.
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*/
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struct decompressor_t {
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void *config;
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void *data;
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int (*bid)(const void *buff, size_t);
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int (*init)(struct archive_read *,
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const void *buff, size_t);
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int (*finish)(struct archive_read *);
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ssize_t (*read_ahead)(struct archive_read *,
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const void **, size_t);
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ssize_t (*consume)(struct archive_read *, size_t);
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off_t (*skip)(struct archive_read *, off_t);
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} decompressors[4];
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/* Pointer to current decompressor. */
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struct decompressor_t *decompressor;
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/*
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* Format detection is mostly the same as compression
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* detection, with one significant difference: 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.
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*/
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struct archive_format_descriptor {
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void *data;
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int (*bid)(struct archive_read *);
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int (*read_header)(struct archive_read *, struct archive_entry *);
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int (*read_data)(struct archive_read *, const void **, size_t *, off_t *);
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int (*read_data_skip)(struct archive_read *);
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int (*cleanup)(struct archive_read *);
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} formats[8];
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struct archive_format_descriptor *format; /* Active format. */
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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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int (*cleanup_archive_extract)(struct archive_read *);
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};
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int __archive_read_register_format(struct archive_read *a,
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void *format_data,
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int (*bid)(struct archive_read *),
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int (*read_header)(struct archive_read *, struct archive_entry *),
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int (*read_data)(struct archive_read *, const void **, size_t *, off_t *),
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int (*read_data_skip)(struct archive_read *),
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int (*cleanup)(struct archive_read *));
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struct decompressor_t
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*__archive_read_register_compression(struct archive_read *a,
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int (*bid)(const void *, size_t),
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int (*init)(struct archive_read *, const void *, size_t));
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const void
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*__archive_read_ahead(struct archive_read *, size_t);
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#endif
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