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Match AGE RIFF decode boundaries

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gamer147
2026-07-29 18:35:21 -04:00
parent da7e0e25ce
commit 32c5d1e901
6 changed files with 105 additions and 16 deletions
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16
godot/RiffWaveSanitizer.cs
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@@ -1,12 +1,13 @@
using System;
using System.Buffers.Binary;
/// <summary>Godot-specific WAV input adapter. Godot assumes RIFF INFO strings are UTF-8, while AGE's
/// Japanese assets commonly store them as CP932. Playback does not consume these tags, so remove only
/// INFO metadata while preserving every functional RIFF chunk byte-for-byte.</summary>
/// <summary>Godot-specific WAV input adapter. Native AGE decodes only the first declared RIFF/WAVE
/// extent, while Godot walks the entire supplied buffer. AGE's Japanese assets also commonly store
/// CP932 strings in INFO metadata that Godot assumes is UTF-8. Prepare a transient decoder copy that
/// follows AGE's first-RIFF boundary and removes only INFO metadata within it.</summary>
internal static class RiffWaveSanitizer
{
public static byte[] RemoveInfoMetadata(byte[] wavBytes)
public static byte[] PrepareForGodot(byte[] wavBytes)
{
ReadOnlySpan<byte> input = wavBytes;
if (input.Length < 12 || !HasId(input, 0, "RIFF") || !HasId(input, 8, "WAVE"))
@@ -26,9 +27,10 @@ internal static class RiffWaveSanitizer
if (isInfoList) removedBytes = checked(removedBytes + chunkBytes);
cursor += chunkBytes;
}
if (removedBytes == 0) return wavBytes;
if (removedBytes == 0 && declaredEnd == wavBytes.Length) return wavBytes;
var output = new byte[checked(wavBytes.Length - removedBytes)];
int newDeclaredEnd = checked(declaredEnd - removedBytes);
var output = new byte[newDeclaredEnd];
input[..12].CopyTo(output);
cursor = 12;
int destination = 12;
@@ -43,8 +45,6 @@ internal static class RiffWaveSanitizer
cursor += chunkBytes;
}
int newDeclaredEnd = declaredEnd - removedBytes;
input[declaredEnd..].CopyTo(output.AsSpan(newDeclaredEnd));
BinaryPrimitives.WriteUInt32LittleEndian(output.AsSpan(4, 4),
checked((uint)(newDeclaredEnd - 8)));
return output;