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fix: handle SPLINEFLAG_ANIMATION in UPDATE_OBJECT legacy spline layout

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When SPLINEFLAG_ANIMATION (0x00400000) is set, AzerothCore inserts 5 bytes
(uint8 animationType + int32 animTime) between durationModNext and
verticalAccel in the SMSG_UPDATE_OBJECT MoveSpline block. The parser was
not accounting for these bytes, causing verticalAccel, effectStartTime,
and pointCount to be read from the wrong offset.

This produced garbage pointCount values (e.g. 3322451254) triggering the
"Spline pointCount invalid (legacy+compact)" fallback path and breaking
UPDATE_OBJECT parsing for animated-spline entities, causing all subsequent
update blocks in the same packet to be dropped.
This commit is contained in:
Kelsi 2026-03-13 02:38:53 -07:00
parent 61adb4a803
commit 1cd8e53b2f
1 changed files with 7 additions and 0 deletions
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7
src/game/world_packets.cpp
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@ -1031,6 +1031,7 @@ bool UpdateObjectParser::parseMovementBlock(network::Packet& packet, UpdateBlock
// Legacy UPDATE_OBJECT spline layout used by many servers:
// timePassed, duration, splineId, durationMod, durationModNext,
// [ANIMATION: animType(1)+animTime(4) if SPLINEFLAG_ANIMATION(0x00400000)],
// verticalAccel, effectStartTime, pointCount, points, splineMode, endPoint.
const size_t legacyStart = packet.getReadPos();
if (!bytesAvailable(12 + 8 + 8 + 4)) return false;
@ -1039,6 +1040,12 @@ bool UpdateObjectParser::parseMovementBlock(network::Packet& packet, UpdateBlock
/*uint32_t splineId =*/ packet.readUInt32();
/*float durationMod =*/ packet.readFloat();
/*float durationModNext =*/ packet.readFloat();
// Animation flag inserts 5 bytes (uint8 type + int32 time) before verticalAccel
if (splineFlags & 0x00400000) { // SPLINEFLAG_ANIMATION
if (!bytesAvailable(5)) return false;
packet.readUInt8(); // animationType
packet.readUInt32(); // animTime
}
/*float verticalAccel =*/ packet.readFloat();
/*uint32_t effectStartTime =*/ packet.readUInt32();
uint32_t pointCount = packet.readUInt32();