Tile generation with caches 2022-10-05 (1122) and older crash

[WizardCM]

See the error below.

https://archive.openrs2.org/caches/runescape/1122

2026-01-10 07:13:13 ERROR STDERR: Exception in thread "main" java.nio.BufferUnderflowException
        at java.base/java.nio.Buffer.nextGetIndex(Buffer.java:721)
        at java.base/java.nio.HeapByteBuffer.getShort(HeapByteBuffer.java:446)
        at net.runelite.cache.io.InputStream.readUnsignedShort(InputStream.java:115)
        at net.runelite.cache.definitions.loaders.MapLoader.loadTerrain(MapLoader.java:60)
        at net.runelite.cache.definitions.loaders.MapLoader.load(MapLoader.java:41)
        at net.runelite.cache.region.RegionLoader.loadRegionFromArchive(RegionLoader.java:101)
        at net.runelite.cache.region.RegionLoader.loadRegions(RegionLoader.java:74)
        at net.runelite.cache.MapImageDumper.loadRegions(MapImageDumper.java:1770)
        at net.runelite.cache.MapImageDumper.load(MapImageDumper.java:226)
        at org.explv.mapimage.Main.main(Main.java:93)

2026-01-10 07:13:13 ERROR Tile generation failed: MapImageDumper failed: Exception in thread "main" java.nio.BufferUnderflowException
        at java.base/java.nio.Buffer.nextGetIndex(Buffer.java:721)
        at java.base/java.nio.HeapByteBuffer.getShort(HeapByteBuffer.java:446)
        at net.runelite.cache.io.InputStream.readUnsignedShort(InputStream.java:115)
        at net.runelite.cache.definitions.loaders.MapLoader.loadTerrain(MapLoader.java:60)
        at net.runelite.cache.definitions.loaders.MapLoader.load(MapLoader.java:41)
        at net.runelite.cache.region.RegionLoader.loadRegionFromArchive(RegionLoader.java:101)
        at net.runelite.cache.region.RegionLoader.loadRegions(RegionLoader.java:74)
        at net.runelite.cache.MapImageDumper.loadRegions(MapImageDumper.java:1770)
        at net.runelite.cache.MapImageDumper.load(MapImageDumper.java:226)
        at org.explv.mapimage.Main.main(Main.java:93)

Traceback (most recent call last):
  File "/app/src/tile_generator.py", line 468, in <module>
    main()
  File "/app/src/tile_generator.py", line 86, in main
    build_full_map_images(cache_dir, xtea_file)
  File "/app/src/tile_generator.py", line 335, in build_full_map_images
    raise RuntimeError(f"MapImageDumper failed: {result.stderr}")
RuntimeError: MapImageDumper failed: Exception in thread "main" java.nio.BufferUnderflowException
        at java.base/java.nio.Buffer.nextGetIndex(Buffer.java:721)
        at java.base/java.nio.HeapByteBuffer.getShort(HeapByteBuffer.java:446)
        at net.runelite.cache.io.InputStream.readUnsignedShort(InputStream.java:115)
        at net.runelite.cache.definitions.loaders.MapLoader.loadTerrain(MapLoader.java:60)
        at net.runelite.cache.definitions.loaders.MapLoader.load(MapLoader.java:41)
        at net.runelite.cache.region.RegionLoader.loadRegionFromArchive(RegionLoader.java:101)
        at net.runelite.cache.region.RegionLoader.loadRegions(RegionLoader.java:74)
        at net.runelite.cache.MapImageDumper.loadRegions(MapImageDumper.java:1770)
        at net.runelite.cache.MapImageDumper.load(MapImageDumper.java:226)
        at org.explv.mapimage.Main.main(Main.java:93)

Works fine with 2022-10-11 (1127).

Personally I'd actually like to use a cache from 2013, such as ID 241.

[JoeGandy]

Hey yeah it was built to only support 1127 onwards, as it's designed for rendering up to date maps automatically. It's require a bit of work to support older cache formats, I'm not sure it's something I'll have time to work on apologies.

This uses mapimagedumper from runelite, I'm not sure they ever built a mapimagedumper for older caches but I could be wrong