Added isExportable which tests if a decal is currently available from the container file. Refactored the code some. Use the FileUtils readBytes[] method.

core/src/net/sf/openrocket/document/DecalRegistry.java

@@ -1,8 +1,6 @@
 package net.sf.openrocket.document;
 
-import java.io.BufferedInputStream;
 import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
@@ -12,6 +10,7 @@ import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
 import net.sf.openrocket.file.FileInfo;
+import net.sf.openrocket.util.FileUtils;
 
 public class DecalRegistry {
 
@@ -30,6 +29,22 @@ public class DecalRegistry {
 		this.isZipFile = isZipFile;
 	}
 
+	public boolean isExportable( String name ) {
+		if ( !isZipFile ) {
+			return false;
+		}
+		try {
+			InputStream is = forwardToEntry(name);
+			if ( is != null ) {
+				is.close();
+				return true;
+			} else {
+				return false;
+			}
+		} catch ( IOException iex ) {
+			return false;
+		}
+	}
 	/**
 	 * This function returns an InputStream backed by a byte[] containing the decal pixels.
 	 * If it reads in the bytes from an actual file, the underlying file is closed.
@@ -50,15 +65,7 @@ public class DecalRegistry {
 		InputStream rawIs = null;
 
 		if ( isZipFile ) {
-			ZipInputStream zis = new ZipInputStream(fileInfo.fileURL.openStream());
-			ZipEntry entry = zis.getNextEntry();
-			while ( entry != null ) {
-				if ( entry.getName().equals(name) ) {
-					rawIs = zis;
-					break;
-				}
-				entry = zis.getNextEntry();
-			}
+			rawIs = forwardToEntry(name);
 		}
 
 		// Check absolute file name:
@@ -82,7 +89,7 @@ public class DecalRegistry {
 		}
 
 		try {
-			byte[] bytes = readBytes(rawIs);
+			byte[] bytes = FileUtils.readBytes(rawIs);
 			// FIXME - update cache;
 			return new ByteArrayInputStream(bytes);
 		}
@@ -92,23 +99,22 @@ public class DecalRegistry {
 
 	}
 
-	private static byte[] readBytes( InputStream is ) throws IOException {
-
-		ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
-
-		byte[] buffer = new byte[1024];
-		
-		if ( ! (is instanceof BufferedInputStream ) ) {
-			is = new BufferedInputStream(is);
+	private ZipInputStream forwardToEntry( String name ) throws IOException {
+		ZipInputStream zis = new ZipInputStream(fileInfo.fileURL.openStream());
+		try {
+			ZipEntry entry = zis.getNextEntry();
+			while ( entry != null ) {
+				if ( entry.getName().equals(name) ) {
+					return zis;
+				}
+				entry = zis.getNextEntry();
+			}
 		}
-
-		int bytesRead = 0;
-		while( (bytesRead = is.read(buffer)) > 0 ) {
-			bos.write(buffer,0,bytesRead);
+		catch ( IOException ioex ) {
+			zis.close();
+			throw ioex;
 		}
-
-		return bos.toByteArray();
-
+		zis.close();
+		return null;
 	}
-
 }