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generic_rsync.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2025 Denis Corbin
4//
5// This program is free software; you can redistribute it and/or
6// modify it under the terms of the GNU General Public License
7// as published by the Free Software Foundation; either version 2
8// of the License, or (at your option) any later version.
9//
10// This program is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with this program; if not, write to the Free Software
17// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18//
19// to contact the author, see the AUTHOR file
20/*********************************************************************/
21
25
26
27#ifndef GENERIC_RSYNC_HPP
28#define GENERIC_RSYNC_HPP
29
30#include "../my_config.h"
31
32extern "C"
33{
34#if HAVE_LIBRSYNC_H
35#include <librsync.h>
36#endif
37}
38
39#include "generic_file.hpp"
40#include "erreurs.hpp"
41
42namespace libdar
43{
44
47
49
50 class generic_rsync : public generic_file
51 {
52 public:
54
61 generic_rsync(generic_file *signature_storage,
62 U_I signature_block_size,
63 generic_file *below);
64
66
78 generic_rsync(generic_file *base_signature,
79 generic_file *below,
80 const infinint & crc_size,
81 const crc **checksum);
82
84
90 generic_rsync(generic_file *current_data,
91 generic_file *delta);
92
93
94 generic_rsync(const generic_rsync & ref) = delete;
95 generic_rsync(generic_rsync && ref) noexcept = delete;
96 generic_rsync & operator = (const generic_rsync & ref) = delete;
97 generic_rsync & operator = (generic_rsync && ref) noexcept = delete;
98
99 ~generic_rsync() noexcept(false);
100
101 // inherited from generic_file
102
103 virtual bool skippable(skippability direction, const infinint & amount) override { return false; };
104 virtual bool skip(const infinint & pos) override {if(pos != 0 || !initial) throw SRC_BUG; else return true; };
105 virtual bool skip_to_eof() override { throw SRC_BUG; };
106 virtual bool skip_relative(S_I x) override { if(x != 0) throw SRC_BUG; else return true; };
107 virtual bool truncatable(const infinint & pos) const override { return pos == get_position(); };
108 virtual infinint get_position() const override { return x_below->get_position(); };
109
110 protected:
111 virtual void inherited_read_ahead(const infinint & amount) override {};
112 virtual U_I inherited_read(char *a, U_I size) override;
113 virtual void inherited_write(const char *a, U_I size) override;
114 virtual void inherited_truncate(const infinint & pos) override { if(pos != get_position()) throw SRC_BUG; };
115 virtual void inherited_sync_write() override {};
116 virtual void inherited_flush_read() override {};
117 virtual void inherited_terminate() override;
118
119 private:
120 enum { sign, delta, patch } status;
121
122 generic_file *x_below;
123 generic_file *x_input;
124 generic_file *x_output;
125 bool initial;
126 char *working_buffer;
127 U_I working_size;
128 bool patching_completed;
129 crc *data_crc;
130
131#if LIBRSYNC_AVAILABLE
132 rs_job_t *job;
133 rs_signature_t *sumset;
134
136 static rs_result patch_callback(void *opaque,
137 rs_long_t pos,
138 size_t *len,
139 void **buf);
140#endif
141
143
153 bool step_forward(const char *buffer_in,
154 U_I & avail_in,
155 bool shift_input,
156 char *buffer_out,
157 U_I & avail_out);
158 void free_job();
159 void send_eof();
160 };
161
163
164} // end of namespace
165
166#endif
libdar::crc
pure virtual class defining interface of a CRC object
Definition crc.hpp:47
libdar::generic_file
this is the interface class from which all other data transfer classes inherit
Definition generic_file.hpp:77
libdar::generic_file::get_position
virtual infinint get_position() const =0
get the current read/write position
libdar::generic_rsync
generic_file interface to librsync
Definition generic_rsync.hpp:51
libdar::generic_rsync::inherited_flush_read
virtual void inherited_flush_read() override
reset internal engine, flush caches in order to read the data at current position
Definition generic_rsync.hpp:116
libdar::generic_rsync::inherited_truncate
virtual void inherited_truncate(const infinint &pos) override
truncate file at the give offset
Definition generic_rsync.hpp:114
libdar::generic_rsync::inherited_terminate
virtual void inherited_terminate() override
destructor-like call, except that it is allowed to throw exceptions
libdar::generic_rsync::skippable
virtual bool skippable(skippability direction, const infinint &amount) override
whether the implementation is able to skip
Definition generic_rsync.hpp:103
libdar::generic_rsync::get_position
virtual infinint get_position() const override
get the current read/write position
Definition generic_rsync.hpp:108
libdar::generic_rsync::generic_rsync
generic_rsync(generic_file *signature_storage, U_I signature_block_size, generic_file *below)
constructor for "signature" operation
libdar::generic_rsync::skip
virtual bool skip(const infinint &pos) override
skip at the absolute position
Definition generic_rsync.hpp:104
libdar::generic_rsync::inherited_sync_write
virtual void inherited_sync_write() override
write down any pending data
Definition generic_rsync.hpp:115
libdar::generic_rsync::inherited_read_ahead
virtual void inherited_read_ahead(const infinint &amount) override
tells the object that several calls to read() will follow to probably obtain at least the given amoun...
Definition generic_rsync.hpp:111
libdar::generic_rsync::generic_rsync
generic_rsync(generic_file *current_data, generic_file *delta)
constructor for "patch" operation (applies a patch to a file)
libdar::generic_rsync::generic_rsync
generic_rsync(generic_file *base_signature, generic_file *below, const infinint &crc_size, const crc **checksum)
constructor for "delta" operation (builds a patch data)
libdar::generic_rsync::step_forward
bool step_forward(const char *buffer_in, U_I &avail_in, bool shift_input, char *buffer_out, U_I &avail_out)
feed librsync using rs_job_iter
libdar::generic_rsync::inherited_read
virtual U_I inherited_read(char *a, U_I size) override
implementation of read() operation
libdar::generic_rsync::skip_to_eof
virtual bool skip_to_eof() override
skip to the end of file
Definition generic_rsync.hpp:105
libdar::generic_rsync::inherited_write
virtual void inherited_write(const char *a, U_I size) override
implementation of the write() operation
libdar::generic_rsync::skip_relative
virtual bool skip_relative(S_I x) override
skip relatively to the current position
Definition generic_rsync.hpp:106
libdar::generic_rsync::x_below
generic_file * x_below
underlying layer to read from / write to
Definition generic_rsync.hpp:122
libdar::generic_rsync::truncatable
virtual bool truncatable(const infinint &pos) const override
whether the implementation is able to truncate to the given position
Definition generic_rsync.hpp:107
libdar::infinint
the arbitrary large positive integer class
Definition real_infinint.hpp:62
erreurs.hpp
contains all the excetion class thrown by libdar
generic_file.hpp
class generic_file is defined here as well as class fichier
my_config.h
include macro defined by the configure script and some specific additional ones
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47