PKHeX/PKHeX.Core/Saves/Blocks/BlockInfoRSBOX.cs

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namespace PKHeX.Core
{
2018-07-29 20:27:48 +00:00
/// <summary>
/// Gen3 <see cref="GameVersion.RSBOX"/> Block Info
/// </summary>
public sealed class BlockInfoRSBOX : BlockInfo
{
public readonly uint SaveCount;
public readonly uint Checksum;
public BlockInfoRSBOX(byte[] data, int offset)
{
Offset = offset;
Length = 0x1FFC;
// Values stored in Big Endian format
Checksum = BigEndian.ToUInt32(data, Offset + 0);
ID = BigEndian.ToUInt32(data, Offset + 4);
SaveCount = BigEndian.ToUInt32(data, Offset + 8);
}
protected override bool ChecksumValid(byte[] data)
{
var chk = GetChecksum(data);
var old = BigEndian.ToUInt32(data, Offset);
return chk == old;
}
protected override void SetChecksum(byte[] data)
{
var chk = GetChecksum(data);
data[Offset + 0] = (byte)(chk >> 24);
data[Offset + 1] = (byte)(chk >> 16);
data[Offset + 2] = (byte)(chk >> 8);
data[Offset + 3] = (byte)(chk >> 0);
}
private uint GetChecksum(byte[] data)
{
int start = Offset + 4;
int end = start + Length - 4;
return GetChecksum(data, start, end);
}
private static uint GetChecksum(byte[] data, int start, int end)
{
ushort chk = 0; // initial value
for (int j = start; j < end; j += 2)
chk += BigEndian.ToUInt16(data, j);
return (uint)(chk << 16 | (ushort)(0xF004 - chk));
}
}
}