7b25d78506
Mirror of PublicUpdatePropertyInt (0x02CE) but with no guid field — targets the local player's own object. Burden (EncumbranceVal, PropertyInt 5) changes ride this opcode on every pick-up / drop. Layout: opcode(4) + seq(1) + property(4) + value(4) = 13 bytes. 3 tests: happy path, wrong opcode, truncated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
38 lines
1.5 KiB
C#
38 lines
1.5 KiB
C#
using System;
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using System.Buffers.Binary;
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namespace AcDream.Core.Net.Messages;
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/// <summary>
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/// Inbound <c>PrivateUpdatePropertyInt (0x02CD)</c> — the server updates one
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/// <c>PropertyInt</c> on the player's OWN object. Unlike the sibling
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/// <see cref="PublicUpdatePropertyInt"/> (0x02CE), this carries NO guid (it
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/// implicitly targets the local player). Burden (<c>EncumbranceVal</c>, PropertyInt 5)
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/// changes ride this opcode on every pick-up / drop.
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///
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/// <para>Wire layout (ACE <c>GameMessagePrivateUpdatePropertyInt</c>):</para>
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/// <code>
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/// u32 opcode = 0x02CD
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/// u8 sequence // single byte (ByteSequence) — not honored, latest-wins (DR-4)
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/// u32 property // PropertyInt enum
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/// i32 value
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/// </code>
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/// </summary>
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public static class PrivateUpdatePropertyInt
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{
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public const uint Opcode = 0x02CDu;
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public readonly record struct Parsed(uint Property, int Value);
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/// <summary>Parse a raw 0x02CD body. Returns null on opcode mismatch / truncation.</summary>
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public static Parsed? TryParse(ReadOnlySpan<byte> body)
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{
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if (body.Length < 13) return null; // 4 + 1 + 4 + 4
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if (BinaryPrimitives.ReadUInt32LittleEndian(body) != Opcode) return null;
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int pos = 4;
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pos += 1; // sequence byte (not honored)
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uint prop = BinaryPrimitives.ReadUInt32LittleEndian(body[pos..]); pos += 4;
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int value = BinaryPrimitives.ReadInt32LittleEndian(body[pos..]);
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return new Parsed(prop, value);
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}
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}
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