PKHeX/PKHeX.Core/Legality/Areas/EncounterArea5.cs
Kurt 47071b41f3
Refactoring: Span-based value writes and method signatures (#3361)
Existing `get`/`set` logic is flawed in that it doesn't work on Big Endian operating systems, and it allocates heap objects when it doesn't need to.

`System.Buffers.Binary.BinaryPrimitives` in the `System.Memory` NuGet package provides both Little Endian and Big Endian methods to read and write data; all the `get`/`set` operations have been reworked to use this new API. This removes the need for PKHeX's manual `BigEndian` class, as all functions are already covered by the BinaryPrimitives API.

The `StringConverter` has now been rewritten to accept a Span to read from & write to, no longer requiring a temporary StringBuilder.

Other Fixes included:
- The Super Training UI for Gen6 has been reworked according to the latest block structure additions.
- Cloning a Stadium2 Save File now works correctly (opening from the Folder browser list).
- Checksum & Sanity properties removed from parent PKM class, and is now implemented via interface.
2022-01-02 21:35:59 -08:00

81 lines
2.6 KiB
C#

using System;
using System.Collections.Generic;
using static System.Buffers.Binary.BinaryPrimitives;
namespace PKHeX.Core
{
/// <inheritdoc cref="EncounterArea" />
/// <summary>
/// <see cref="GameVersion.Gen5"/> encounter area
/// </summary>
public sealed record EncounterArea5 : EncounterArea
{
public readonly EncounterSlot5[] Slots;
protected override IReadOnlyList<EncounterSlot> Raw => Slots;
public static EncounterArea5[] GetAreas(byte[][] input, GameVersion game)
{
var result = new EncounterArea5[input.Length];
for (int i = 0; i < input.Length; i++)
result[i] = new EncounterArea5(input[i], game);
return result;
}
private EncounterArea5(ReadOnlySpan<byte> data, GameVersion game) : base(game)
{
Location = ReadUInt16LittleEndian(data);
Type = (SlotType)data[2];
Slots = ReadSlots(data);
}
private EncounterSlot5[] ReadSlots(ReadOnlySpan<byte> data)
{
const int size = 4;
int count = (data.Length - 4) / size;
var slots = new EncounterSlot5[count];
for (int i = 0; i < slots.Length; i++)
{
int offset = 4 + (size * i);
var entry = data.Slice(offset, size);
slots[i] = ReadSlot(entry);
}
return slots;
}
private EncounterSlot5 ReadSlot(ReadOnlySpan<byte> entry)
{
ushort SpecForm = ReadUInt16LittleEndian(entry);
int species = SpecForm & 0x3FF;
int form = SpecForm >> 11;
int min = entry[2];
int max = entry[3];
return new EncounterSlot5(this, species, form, min, max);
}
public override IEnumerable<EncounterSlot> GetMatchingSlots(PKM pkm, IReadOnlyList<EvoCriteria> chain)
{
foreach (var slot in Slots)
{
foreach (var evo in chain)
{
if (slot.Species != evo.Species)
continue;
if (!slot.IsLevelWithinRange(pkm.Met_Level))
break;
// Deerling and Sawsbuck can change forms when seasons change, thus can be any of the [0,3] form values.
// no other wild forms can change
if (slot.Form != evo.Form && slot.Species is not ((int)Species.Deerling or (int)Species.Sawsbuck))
break;
yield return slot;
break;
}
}
}
}
}