Utilize mark and reset for stream handling

Author: Michael5601

bundles/org.eclipse.swt.svg/src/org/eclipse/swt/svg/JSVGRasterizer.java

@@ -165,7 +165,12 @@ public boolean isSVGFile(InputStream stream) throws IOException {
 		if (stream == null) {
 	        throw new IllegalArgumentException("InputStream cannot be null");
 	    }
-	    int firstByte = inputStream.read();
-	    return firstByte == '<';
+		stream.mark(Integer.MAX_VALUE);
+		try {
+		    int firstByte = stream.read();
+		    return firstByte == '<';
+		} finally {
+			stream.reset();
+		}
 	}
 }

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/SVGRasterizer.java

@@ -37,7 +37,7 @@ public interface SVGRasterizer {
 	/**
 	 * Determines whether the given {@link InputStream} contains a SVG file.
 	 *
-	 * @param inputStream the input stream to check.
+	 * @param stream the input stream to check.
 	 * @return {@code true} if the input stream contains SVG content; {@code false}
 	 *         otherwise.
 	 * @throws IOException              if an error occurs while reading the stream.