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78 changes: 78 additions & 0 deletions
78
Persona.Merger.Common/Patching/Tbl/FieldResolvers/TblPatcherCommon.cs
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using System.Runtime.InteropServices; | ||
using Persona.Merger.Utilities; | ||
using Reloaded.Memory.Streams; | ||
using Sewer56.StructuredDiff; | ||
using Sewer56.StructuredDiff.Interfaces; | ||
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namespace Persona.Merger.Patching.Tbl.FieldResolvers; | ||
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/// <summary> | ||
/// Common functionality used in multiple TBL patchers. | ||
/// </summary> | ||
internal class TblPatcherCommon | ||
{ | ||
/// <summary> | ||
/// Converts a list of segments and their respective slices to Memory{byte} objects. | ||
/// </summary> | ||
internal static unsafe Memory<byte>[] ConvertSegmentsToMemory(int segmentCount, PointerLengthTuple* originalSegments, byte* tblData, byte[] tblDataArr) | ||
{ | ||
var segments = new Memory<byte>[segmentCount]; | ||
for (int x = 0; x < segmentCount; x++) | ||
{ | ||
ref var originalSegment = ref originalSegments[x]; | ||
var offset = originalSegment.Pointer - tblData; | ||
segments[x] = new Memory<byte>(tblDataArr, (int)offset, originalSegment.Length); | ||
} | ||
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return segments; | ||
} | ||
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/// <summary> | ||
/// Applies a given list of table patches to the current file's TBL segments. | ||
/// </summary> | ||
internal static unsafe void ApplyPatch(List<TblPatch> patches, int x, Memory<byte>[] segments) | ||
{ | ||
foreach (var patch in CollectionsMarshal.AsSpan(patches)) | ||
{ | ||
var destination = GC.AllocateUninitializedArray<byte>(Math.Max(patch.SegmentDiffs[x].LengthAfterPatch, segments[x].Length)); | ||
var patchDiff = patch.SegmentDiffs[x].Data; | ||
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fixed (byte* destinationPtr = &destination[0]) | ||
fixed (byte* currentSegmentPtr = segments[x].Span) | ||
fixed (byte* patchPtr = patchDiff.Span) | ||
{ | ||
S56DiffDecoder.Decode(currentSegmentPtr, patchPtr, destinationPtr, (nuint)patch.SegmentDiffs[x].Data.Length, | ||
out var numWritten); | ||
segments[x] = new Memory<byte>(destination, 0, (int)numWritten); | ||
} | ||
} | ||
} | ||
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/// <summary> | ||
/// Writes the segment to the stream. | ||
/// </summary> | ||
internal static void WriteSegment(ExtendedMemoryStream memoryStream, Memory<byte> segment, int alignment) | ||
{ | ||
memoryStream.Write(segment.Length); | ||
memoryStream.Write(segment.Span); | ||
memoryStream.AddPadding(alignment); | ||
} | ||
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/// <summary> | ||
/// Creates a diff for an individual segment and adds it to the patch. | ||
/// </summary> | ||
internal static unsafe void DiffSegment<T>(TblPatch patch, PointerLengthTuple newSegment, PointerLengthTuple originalSegment, T resolver) where T : IEncoderFieldResolver | ||
{ | ||
var destination = GC.AllocateUninitializedArray<byte>((int)S56DiffEncoder.CalculateMaxDestinationLength(newSegment.Length)); | ||
fixed (byte* destinationPtr = destination) | ||
{ | ||
var numEncoded = S56DiffEncoder.Encode(originalSegment.Pointer, newSegment.Pointer, | ||
destinationPtr, (nuint)originalSegment.Length, (nuint)newSegment.Length, resolver); | ||
patch.SegmentDiffs.Add(new TblPatch.SegmentDiff() | ||
{ | ||
Data = destination.AsMemory(0, (int)numEncoded), | ||
LengthAfterPatch = newSegment.Length | ||
}); | ||
} | ||
} | ||
} |
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