mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-18 08:23:12 +00:00
305 lines
12 KiB
C#
305 lines
12 KiB
C#
using System;
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using System.Collections.Generic;
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using static System.Buffers.Binary.BinaryPrimitives;
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namespace PKHeX.Core
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{
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/// <summary>
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/// Common logic for <see cref="PKM"/> data providing and manipulation.
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/// </summary>
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public static class PKX
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{
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internal static readonly PersonalTable Personal = PersonalTable.LA;
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public const int Generation = 8;
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private static readonly HashSet<int> Sizes = new()
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{
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PokeCrypto.SIZE_1JLIST, PokeCrypto.SIZE_1ULIST,
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PokeCrypto.SIZE_2ULIST, PokeCrypto.SIZE_2JLIST, PokeCrypto.SIZE_2STADIUM,
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PokeCrypto.SIZE_3STORED, PokeCrypto.SIZE_3PARTY,
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PokeCrypto.SIZE_3CSTORED, PokeCrypto.SIZE_3XSTORED,
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PokeCrypto.SIZE_4STORED, PokeCrypto.SIZE_4PARTY,
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PokeCrypto.SIZE_5PARTY,
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PokeCrypto.SIZE_6STORED, PokeCrypto.SIZE_6PARTY,
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PokeCrypto.SIZE_8STORED, PokeCrypto.SIZE_8PARTY,
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PokeCrypto.SIZE_8ASTORED, PokeCrypto.SIZE_8APARTY,
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};
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/// <summary>
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/// Determines if the given length is valid for a <see cref="PKM"/>.
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/// </summary>
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/// <param name="len">Data length of the file/array.</param>
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/// <returns>A <see cref="bool"/> indicating whether or not the length is valid for a <see cref="PKM"/>.</returns>
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public static bool IsPKM(long len) => Sizes.Contains((int)len);
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/// <summary>
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/// Gets randomized EVs for a given generation format
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/// </summary>
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/// <param name="generation">Generation specific formatting option</param>
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/// <returns>Array containing randomized EVs (H/A/B/S/C/D)</returns>
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public static int[] GetRandomEVs(int generation = Generation)
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{
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var rnd = Util.Rand;
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if (generation > 2)
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{
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var evs = new int[6];
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do
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{
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int max = 510;
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for (int i = 0; i < evs.Length - 1; i++)
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max -= evs[i] = (byte)Math.Min(rnd.Next(Math.Min(300, max)), 252);
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evs[5] = max;
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} while (evs[5] > 252);
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Util.Shuffle(evs.AsSpan());
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return evs;
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}
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else
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{
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var evs = new int[6];
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for (int i = 0; i < evs.Length; i++)
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evs[i] = rnd.Next(ushort.MaxValue + 1);
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return evs;
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}
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}
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/// <summary>
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/// Translates a Gender string to Gender integer.
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/// </summary>
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/// <param name="s">Gender string</param>
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/// <returns>Gender integer</returns>
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public static int GetGenderFromString(string s)
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{
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if (s.Length != 1)
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return 2;
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return GetGenderFromChar(s[0]);
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}
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private static int GetGenderFromChar(char c) => c switch
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{
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'♂' or 'M' => 0,
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'♀' or 'F' => 1,
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_ => 2,
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};
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/// <summary>
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/// Gets the nature modification values and checks if they are equal.
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/// </summary>
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/// <param name="nature">Nature</param>
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/// <param name="incr">Increased stat</param>
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/// <param name="decr">Decreased stat</param>
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/// <returns>True if nature modification values are equal or the Nature is out of range.</returns>
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public static bool GetNatureModification(int nature, out int incr, out int decr)
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{
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incr = (nature / 5) + 1;
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decr = (nature % 5) + 1;
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return incr == decr || nature >= 25; // invalid
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}
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/// <summary>
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/// Updates stats according to the specified nature.
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/// </summary>
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/// <param name="stats">Current stats to amplify if appropriate</param>
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/// <param name="nature">Nature</param>
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public static void ModifyStatsForNature(ushort[] stats, int nature)
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{
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if (GetNatureModification(nature, out int incr, out int decr))
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return;
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stats[incr] *= 11; stats[incr] /= 10;
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stats[decr] *= 9; stats[decr] /= 10;
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}
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/// <summary>
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/// Gets a random PID according to specifications.
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/// </summary>
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/// <param name="rnd">RNG to use</param>
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/// <param name="species">National Dex ID</param>
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/// <param name="gender">Current Gender</param>
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/// <param name="origin">Origin Generation</param>
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/// <param name="nature">Nature</param>
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/// <param name="form">Form</param>
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/// <param name="oldPID">Current PID</param>
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/// <remarks>Used to retain ability bits.</remarks>
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/// <returns>Rerolled PID.</returns>
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public static uint GetRandomPID(Random rnd, int species, int gender, int origin, int nature, int form, uint oldPID)
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{
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// Gen6+ (and VC) PIDs do not tie PID to Nature/Gender/Ability
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if (origin >= 24)
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return Util.Rand32(rnd);
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// Below logic handles Gen3-5.
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int gt = Personal[species].Gender;
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bool g34 = origin <= 15;
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uint abilBitVal = g34 ? oldPID & 0x0000_0001 : oldPID & 0x0001_0000;
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bool g3unown = origin <= 5 && species == (int)Species.Unown;
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bool singleGender = PersonalInfo.IsSingleGender(gt); // single gender, skip gender check
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while (true) // Loop until we find a suitable PID
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{
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uint pid = Util.Rand32(rnd);
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// Gen 3/4: Nature derived from PID
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if (g34 && pid%25 != nature)
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continue;
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// Gen 3 Unown: Letter/form derived from PID
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if (g3unown)
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{
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var pidLetter = GetUnownForm(pid);
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if (pidLetter != form)
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continue;
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}
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else if (g34)
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{
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if (abilBitVal != (pid & 0x0000_0001)) // keep ability bits
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continue;
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}
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else
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{
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if (abilBitVal != (pid & 0x0001_0000)) // keep ability bits
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continue;
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}
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if (singleGender) // Set Gender(less)
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return pid; // PID can be anything
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// Gen 3/4/5: Gender derived from PID
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if (gender == GetGenderFromPIDAndRatio(pid, gt))
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return pid;
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}
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}
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/// <summary>
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/// Gets the Unown Forme ID from PID.
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/// </summary>
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/// <param name="pid">Personality ID</param>
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/// <remarks>Should only be used for 3rd Generation origin specimens.</remarks>
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/// <returns></returns>
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public static int GetUnownForm(uint pid)
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{
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var value = (pid & 0x3000000) >> 18 | (pid & 0x30000) >> 12 | (pid & 0x300) >> 6 | (pid & 0x3);
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return (int)(value % 28);
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}
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/// <summary>
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/// Gets the gender ID of the species based on the Personality ID.
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/// </summary>
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/// <param name="species">National Dex ID.</param>
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/// <param name="pid">Personality ID.</param>
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/// <returns>Gender ID (0/1/2)</returns>
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/// <remarks>This method should only be used for Generations 3-5 origin.</remarks>
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public static int GetGenderFromPID(int species, uint pid)
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{
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int gt = Personal[species].Gender;
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return GetGenderFromPIDAndRatio(pid, gt);
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}
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public static int GetGenderFromPIDAndRatio(uint pid, int gr) => gr switch
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{
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PersonalInfo.RatioMagicGenderless => 2,
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PersonalInfo.RatioMagicFemale => 1,
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PersonalInfo.RatioMagicMale => 0,
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_ => (pid & 0xFF) < gr ? 1 : 0,
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};
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internal const string ExtensionPB7 = "pb7";
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internal const string ExtensionPB8 = "pb8";
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internal const string ExtensionPA8 = "pa8";
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/// <summary>
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/// Gets an array of valid <see cref="PKM"/> file extensions.
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/// </summary>
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/// <param name="maxGeneration">Maximum Generation to permit</param>
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/// <returns>Valid <see cref="PKM"/> file extensions.</returns>
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public static string[] GetPKMExtensions(int maxGeneration = Generation)
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{
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var result = new List<string>();
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int min = maxGeneration is <= 2 or >= 7 ? 1 : 3;
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for (int i = min; i <= maxGeneration; i++)
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result.Add($"pk{i}");
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if (maxGeneration >= 3)
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{
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result.Add("ck3"); // colosseum
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result.Add("xk3"); // xd
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}
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if (maxGeneration >= 4)
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result.Add("bk4"); // battle revolution
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if (maxGeneration >= 7)
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result.Add(ExtensionPB7); // let's go
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if (maxGeneration >= 8)
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result.Add(ExtensionPB8); // Brilliant Diamond & Shining Pearl
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if (maxGeneration >= 8)
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result.Add(ExtensionPA8); // Legends: Arceus
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return result.ToArray();
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}
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/// <summary>
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/// Roughly detects the PKM format from the file's extension.
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/// </summary>
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/// <param name="ext">File extension.</param>
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/// <param name="prefer">Preference if not a valid extension, usually the highest acceptable format.</param>
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/// <returns>Format hint that the file is.</returns>
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public static int GetPKMFormatFromExtension(string ext, int prefer)
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{
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if (string.IsNullOrEmpty(ext))
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return prefer;
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return GetPKMFormatFromExtension(ext[^1], prefer);
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}
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/// <summary>
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/// Roughly detects the PKM format from the file's extension.
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/// </summary>
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/// <param name="last">Last character of the file's extension.</param>
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/// <param name="prefer">Preference if not a valid extension, usually the highest acceptable format.</param>
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/// <returns>Format hint that the file is.</returns>
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public static int GetPKMFormatFromExtension(char last, int prefer)
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{
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if (last is >= '1' and <= '9')
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return last - '0';
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return last == 'x' ? 6 : prefer;
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}
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internal static bool IsPKMPresentGB(ReadOnlySpan<byte> data) => data[0] != 0; // Species non-zero
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internal static bool IsPKMPresentGC(ReadOnlySpan<byte> data) => ReadUInt16BigEndian(data) != 0; // Species non-zero
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internal static bool IsPKMPresentGBA(ReadOnlySpan<byte> data) => (data[0x13] & 0xFB) == 2; // ignore egg flag, must be FlagHasSpecies.
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internal static bool IsPKMPresent(ReadOnlySpan<byte> data)
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{
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if (ReadUInt32LittleEndian(data) != 0) // PID
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return true;
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ushort species = ReadUInt16LittleEndian(data[8..]);
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return species != 0;
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}
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/// <summary>
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/// Gets a function that can check a byte array (at an offset) to see if a <see cref="PKM"/> is possibly present.
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/// </summary>
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/// <param name="blank"></param>
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/// <returns>Function that checks if a byte array (at an offset) has a <see cref="PKM"/> present</returns>
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public static Func<byte[], bool> GetFuncIsPKMPresent(PKM blank)
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{
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if (blank.Format >= 4)
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return x => IsPKMPresent(x);
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if (blank.Format <= 2)
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return x => IsPKMPresentGB(x);
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if (blank.Data.Length <= PokeCrypto.SIZE_3PARTY)
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return x => IsPKMPresentGBA(x);
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return x => IsPKMPresentGC(x);
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}
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/// <summary>
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/// Reorders (in place) the input array of stats to have the Speed value last rather than before the SpA/SpD stats.
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/// </summary>
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/// <param name="value">Input array to reorder</param>
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/// <returns>Same array, reordered.</returns>
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public static void ReorderSpeedLast(Span<int> value)
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{
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var spe = value[3];
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value[3] = value[4];
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value[4] = value[5];
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value[5] = spe;
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}
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}
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}
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