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/*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2020 Denis Corbin
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// to contact the author : http://dar.linux.free.fr/email.html
/*********************************************************************/
#include "../my_config.h"
extern "C"
{
// to allow compilation under Cygwin we need <sys/types.h>
// else Cygwin's <netinet/in.h> lack __int16_t symbol !?!
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
} // end extern "C"
#include <string>
#include <new>
#include "slave_zapette.hpp"
#include "infinint.hpp"
#include "tools.hpp"
#include "trivial_sar.hpp"
#include "sar.hpp"
#include "zapette_protocol.hpp"
using namespace std;
namespace libdar
{
slave_zapette::slave_zapette(generic_file *input, generic_file *output, generic_file *data)
{
if(input == nullptr)
throw SRC_BUG;
if(output == nullptr)
throw SRC_BUG;
if(data == nullptr)
throw SRC_BUG;
if(input->get_mode() == gf_write_only)
throw Erange("slave_zapette::slave_zapette", gettext("Input cannot be read"));
if(output->get_mode() == gf_read_only)
throw Erange("slave_zapette::slave_zapette", gettext("Cannot write to output"));
if(data->get_mode() != gf_read_only)
throw Erange("slave_zapette::slave_zapette", gettext("Data should be read-only"));
in = input;
out = output;
src = data;
src_ctxt = dynamic_cast<contextual *>(data);
if(src_ctxt == nullptr)
throw Erange("slave_zapette::slave_zapette", "Object given to data must inherit from contextual class");
}
slave_zapette::~slave_zapette()
{
if(in != nullptr)
delete in;
if(out != nullptr)
delete out;
if(src != nullptr)
delete src;
}
void slave_zapette::action()
{
request req;
answer ans;
char *buffer = nullptr;
U_16 buf_size = 1024;
buffer = new (nothrow) char[buf_size];
if(buffer == nullptr)
throw Ememory("slave_zapette::action");
try
{
do
{
req.read(in);
ans.serial_num = req.serial_num;
if(req.size != REQUEST_SIZE_SPECIAL_ORDER)
{
ans.type = ANSWER_TYPE_DATA;
if(src->skip(req.offset))
{
// enlarge buffer if necessary
if(req.size > buf_size)
{
if(buffer != nullptr)
delete [] buffer;
buffer = new (nothrow) char [req.size];
if(buffer == nullptr)
throw Ememory("slave_zapette::action");
else
buf_size = req.size;
}
ans.size = src->read(buffer, req.size);
ans.write(out, buffer);
}
else // bad position
{
ans.size = 0;
ans.write(out, nullptr);
}
}
else // special orders
{
if(req.offset == REQUEST_OFFSET_END_TRANSMIT) // stop communication
{
ans.type = ANSWER_TYPE_DATA;
ans.size = 0;
ans.write(out, nullptr);
}
else if(req.offset == REQUEST_OFFSET_GET_FILESIZE) // return file size
{
ans.type = ANSWER_TYPE_INFININT;
if(!src->skip_to_eof())
throw Erange("slave_zapette::action", gettext("Cannot skip at end of file"));
ans.arg = src->get_position();
ans.write(out, nullptr);
}
else if(req.offset == REQUEST_OFFSET_CHANGE_CONTEXT_STATUS) // contextual status change requested
{
ans.type = ANSWER_TYPE_INFININT;
ans.arg = 1;
src_ctxt->set_info_status(req.info);
ans.write(out, nullptr);
}
else if(req.offset == REQUEST_IS_OLD_START_END_ARCHIVE) // return whether the underlying archive has an old slice header or not
{
ans.type = ANSWER_TYPE_INFININT;
ans.arg = src_ctxt->is_an_old_start_end_archive() ? 1 : 0;
ans.write(out, nullptr);
}
else if(req.offset == REQUEST_GET_DATA_NAME) // return the data_name of the underlying sar
{
ans.type = ANSWER_TYPE_DATA;
ans.arg = 0;
ans.size = src_ctxt->get_data_name().size();
ans.write(out, (char *)(src_ctxt->get_data_name().data()));
}
else if(req.offset == REQUEST_FIRST_SLICE_HEADER_SIZE)
{
trivial_sar *src_triv = dynamic_cast<trivial_sar *>(src);
sar *src_sar = dynamic_cast<sar *>(src);
ans.type = ANSWER_TYPE_INFININT;
if(src_triv != nullptr)
ans.arg = src_triv->get_slice_header_size();
else if(src_sar != nullptr)
ans.arg = src_sar->get_first_slice_header_size();
else
ans.arg = 0; // means unknown
ans.write(out, nullptr);
}
else if(req.offset == REQUEST_OTHER_SLICE_HEADER_SIZE)
{
trivial_sar *src_triv = dynamic_cast<trivial_sar *>(src);
sar *src_sar = dynamic_cast<sar *>(src);
ans.type = ANSWER_TYPE_INFININT;
if(src_triv != nullptr)
ans.arg = src_triv->get_slice_header_size();
else if(src_sar != nullptr)
ans.arg = src_sar->get_non_first_slice_header_size();
else
ans.arg = 0; // means unknown
ans.write(out, nullptr);
}
else
throw Erange("zapette::action", gettext("Received unknown special order"));
}
}
while(req.size != REQUEST_SIZE_SPECIAL_ORDER || req.offset != REQUEST_OFFSET_END_TRANSMIT);
}
catch(...)
{
if(buffer != nullptr)
delete [] buffer;
throw;
}
if(buffer != nullptr)
delete [] buffer;
}
} // end of namespace
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