Add Support for Reading SpongeV3 schematics

index.js

@@ -7,6 +7,7 @@ const { Vec3 } = require('vec3')
 const mcData = require('minecraft-data')
 
 const sponge = require('./lib/spongeSchematic')
+const spongeV3 = require('./lib/spongeV3Schematic')
 const mcedit = require('./lib/mceditSchematic')
 
 class Schematic {
@@ -130,10 +131,13 @@ class Schematic {
 
   static async read (buffer, version = null) {
     const schem = nbt.simplify(await parseNbt(buffer))
-    try {
-      return sponge.read(schem, version)
-    } catch {
-      return mcedit.read(schem, version)
+    const formats = [sponge, spongeV3, mcedit]
+    for (const format of formats) {
+      try {
+        return format.read(schem, version)
+      } catch (e) {
+
+      }
     }
   }
 

lib/spongeV3Schematic.js

@@ -0,0 +1,65 @@
+const { Vec3 } = require('vec3')
+const versions = require('minecraft-data').versions.pc
+const { parseBlockName, getStateId } = require('./states')
+
+function findVersion (dataVersion) {
+  for (const v of versions) {
+    if (v.dataVersion === dataVersion) {
+      return v.minecraftVersion
+    }
+  }
+  return versions[0].minecraftVersion // default to latest
+}
+
+function parsePalette (mcData, palette) {
+  const out = []
+  for (const [str, id] of Object.entries(palette)) {
+    const { name, properties } = parseBlockName(str)
+    out[id] = getStateId(mcData, name, properties)
+  }
+  return out
+}
+
+function byteArrayToVarintArray (byteArray) {
+  const varintArray = []
+  let i = 0
+  while (i < byteArray.length) {
+    let value = 0
+    let varintLength = 0
+    while (true) {
+      value |= (byteArray[i] & 127) << (varintLength++ * 7)
+      if (varintLength > 5) throw new Error('VarInt too big (probably corrupted data)')
+      if ((byteArray[i++] & 128) !== 128) break
+    }
+    varintArray.push(value)
+  }
+  return varintArray
+}
+
+function read (nbt, version) {
+  const { Schematic } = require('../')
+  if (!version) {
+    version = findVersion(nbt.Schematic.DataVersion)
+  }
+  let mcData = require('minecraft-data')(version)
+  if (!mcData) {
+    version = '1.20.6'
+    console.log(`Warning, ${version} is not supported, using 1.20.6 as fallback`)
+    mcData = require('minecraft-data')(version)
+  }
+  const palette = parsePalette(mcData, nbt.Schematic.Blocks.Palette)
+  const size = new Vec3(nbt.Schematic.Width, nbt.Schematic.Height, nbt.Schematic.Length)
+  let offset = new Vec3(0, 0, 0)
+
+  if (nbt.Schematic.Offset) {
+    offset = new Vec3(
+      nbt.Schematic.Offset[0],
+      nbt.Schematic.Offset[1],
+      nbt.Schematic.Offset[2])
+  }
+  const blocks = byteArrayToVarintArray(nbt.Schematic.Blocks.Data)
+  const schem = new Schematic(version, size, offset, palette, blocks)
+  return schem
+}
+
+module.exports = { read }

test/cycle.test.js

@@ -13,7 +13,6 @@ describe('cycle test', () => {
       const schemFile = path.join(__dirname, 'schematics', schemName)
       test(`${schemName} read / write`, async () => {
         const schematic = await Schematic.read(await fs.readFile(schemFile))
-
         const tmpFile = path.join(__dirname, schemName + '_test.schem')
 
         await fs.writeFile(tmpFile, await schematic.write())