Fix QCMPFileHeader to support Vector3D quantization.

When Vector3D quantization is used, don't save plane data sizes but
instead save voxel layer data sizes. This means to preallocate less
values in header.

Also modify getHeaderSize() function to return the correct header size.

src/main/java/azgracompress/fileformat/QCMPFileHeader.java

 package azgracompress.fileformat;
 
 import azgracompress.U16;
+import azgracompress.compression.VQImageCompressor;
 import azgracompress.data.V3i;
 
 import java.io.DataInputStream;
@@ -71,15 +72,17 @@ public class QCMPFileHeader {
         outputStream.writeShort(vectorSizeY);
         outputStream.writeShort(vectorSizeZ);
 
+        // NOTE(Moravec): Allocate space for plane/voxel layers data sizes. Offset: 23.
+        final int chunkCount = (quantizationType != QuantizationType.Vector3D)
+                ? imageSizeZ
+                : VQImageCompressor.calculateVoxelLayerCount(imageSizeZ, vectorSizeZ);
 
-        // NOTE(Moravec): Allocate space for plane data sizes. Offset: 23.
-        for (int i = 0; i < imageSizeZ; i++) {
+        for (int i = 0; i < chunkCount; i++) {
             outputStream.writeInt(0x0);
         }
     }
 
     public boolean readHeader(DataInputStream inputStream) throws IOException {
-
         if (inputStream.available() < BASE_QCMP_HEADER_SIZE) {
             return false;
         }
@@ -108,8 +111,13 @@ public class QCMPFileHeader {
         vectorSizeY = inputStream.readUnsignedShort();
         vectorSizeZ = inputStream.readUnsignedShort();
 
-        planeDataSizes = new long[imageSizeZ];
-        for (int i = 0; i < imageSizeZ; i++) {
+
+        final int chunkCount = (quantizationType != QuantizationType.Vector3D)
+                ? imageSizeZ
+                : VQImageCompressor.calculateVoxelLayerCount(imageSizeZ, vectorSizeZ);
+
+        planeDataSizes = new long[chunkCount];
+        for (int i = 0; i < chunkCount; i++) {
             final long readValue = inputStream.readInt();
             planeDataSizes[i] = (readValue & 0x00000000FFFFFFFFL);
         }
@@ -214,6 +222,10 @@ public class QCMPFileHeader {
     }
 
     public long getHeaderSize() {
-        return BASE_QCMP_HEADER_SIZE + (imageSizeZ * 4);
+        final int chunkCount = (quantizationType != QuantizationType.Vector3D)
+                ? imageSizeZ
+                : VQImageCompressor.calculateVoxelLayerCount(imageSizeZ, vectorSizeZ);
+
+        return BASE_QCMP_HEADER_SIZE + (chunkCount * 4);
     }
 }
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