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//
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//
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//    Copyright 2010 TheSeven
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//
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//
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//    This file is part of emCORE.
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//
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//    emCORE is free software: you can redistribute it and/or
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//    modify it under the terms of the GNU General Public License as
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//    published by the Free Software Foundation, either version 2 of the
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//    License, or (at your option) any later version.
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//
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//    emCORE is distributed in the hope that it will be useful,
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//    but WITHOUT ANY WARRANTY; without even the implied warranty of
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//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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//    See the GNU General Public License for more details.
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//
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//    You should have received a copy of the GNU General Public License along
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//    with emCORE.  If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include "emcorelib.h"
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#include "export/libboot.h"
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static struct libboot_api apitable =
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{
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    .verify_rockbox_checksum = verify_rockbox_checksum
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};
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EMCORE_LIB_HEADER(LIBBOOT_IDENTIFIER, LIBBOOT_API_VERSION, LIBBOOT_MIN_API_VERSION,
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                  NULL, NULL, apitable)
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int verify_rockbox_checksum(void* image, size_t size)
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{
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    int i;
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    uint8_t* data = (uint8_t*)image;
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    uint32_t checksum = data[3] | (data[2] << 8) | (data[1] << 16) | (data[0] << 24);
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    uint32_t platform;
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    switch (get_platform_id())
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    {
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        case 0x47324e49:  // IN2G
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            checksum -= 62;
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            platform = 0x67326e6e;  // nn2g
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            break;
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        case 0x4c435049:  // IPCL
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            checksum -= 71;
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            platform = 0x67367069;  // ip6g
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            break;
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        default:
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            return -3;
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    }
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    if (*((uint32_t*)&data[4]) != platform) return -2;
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    for (i = 0; i < size - 8; i++)
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    {
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        data[i] = data[i + 8];
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        checksum -= data[i + 8];
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    }
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    if (checksum) return -1;
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    return 0;
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}