//
//      aegis - project change supervisor
//      Copyright (C) 2005, 2006, 2008, 2012, 2014 Peter Miller
//
//      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 3 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, see
//      <http://www.gnu.org/licenses/>.
//

#include <common/ac/zlib.h>

#include <libaegis/input/verify_check.h>
#include <libaegis/sub.h>


input_verify_checksum::~input_verify_checksum()
{
}


input_verify_checksum::input_verify_checksum(
    const input::pointer &arg1,
    unsigned long arg2
) :
    deeper(arg1),
    checksum_given(arg2),
    checksum_calculated(adler32(0L, Z_NULL, 0)),
    pos(0)
{
}


input_verify_checksum::pointer
input_verify_checksum::create(const input::pointer &arg1, unsigned long arg2)
{
    return pointer(new input_verify_checksum(arg1, arg2));
}


ssize_t
input_verify_checksum::read_inner(void *data, size_t nbytes)
{
    long result = deeper->read(data, nbytes);
    if (!result)
    {
        if (checksum_calculated != checksum_given)
        {
            sub_context_ty sc;
            sc.var_set_string("File_Name", deeper->name());
            sc.var_set_string
            (
                "Number1",
                nstring::format("%08lX", checksum_given)
            );
            sc.var_set_string
            (
                "Number2",
                nstring::format("%08lX", checksum_calculated)
            );
            sc.fatal_intl
            (
                i18n("$filename: checksum mismatch ($number1 != $number2)")
            );
            // NOTREACHED
        }
        return 0;
    }
    checksum_calculated = adler32(checksum_calculated, (Bytef *)data, result);
    pos += result;
    return result;
}


nstring
input_verify_checksum::name(void)
{
    return deeper->name();
}


off_t
input_verify_checksum::length(void)
{
    return deeper->length();
}


off_t
input_verify_checksum::ftell_inner(void)
{
    return pos;
}


bool
input_verify_checksum::is_remote(void)
    const
{
    return deeper->is_remote();
}


// vim: set ts=8 sw=4 et :