// Copyright (c) 2018, Rene Lergner - wpinternals.net - @Heathcliff74xda
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;

namespace WPinternals
{
    internal class SBL2
    {
        internal byte[] Binary;

        internal SBL2(byte[] Binary)
        {
            this.Binary = Binary;
        }

        // Magic!
        internal byte[] Patch()
        {
            UInt32? PatchOffset = ByteOperations.FindPattern(Binary,
                new byte[] {
                    0xFF, 0xFF, 0xFF, 0xE3, 0x01, 0x0E, 0x42, 0xE3, 0x28, 0x00, 0xD0, 0xE5, 0x1E, 0xFF, 0x2F, 0xE1
                },
                new byte[] {
                    0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
                },
                null);
            
            if (PatchOffset == null)
                throw new BadImageFormatException();

            Buffer.BlockCopy(new byte[] { 0x00, 0x00, 0xA0, 0xE3 }, 0, Binary, (int)PatchOffset + 8, 4);

            return Binary;
        }
    }
}
