Issue #367 Search in memory: save(export) SWFs

few refactorings

trunk/src/com/jpexs/helpers/LimitedInputStream.java

@@ -0,0 +1,38 @@
+package com.jpexs.helpers;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ *
+ * @author JPEXS
+ */
+public class LimitedInputStream extends InputStream {
+
+    private InputStream is;
+    private long pos = 0;
+    private long limit;
+
+    public LimitedInputStream(InputStream is, long limit) {
+        this.is = is;
+        this.limit = limit;
+    }
+
+    @Override
+    public int read() throws IOException {
+        if (pos >= limit) {
+            return -1;
+        }
+        pos++;
+        return is.read();
+    }
+
+    @Override
+    public int available() throws IOException {
+        int avail = is.available();
+        if (pos + avail > limit) {
+            avail = (int)(limit - pos);
+        }
+        return avail;
+    }
+}