1 files changed, 45 insertions, 0 deletions
diff --git a/core/src/main/java/net/oauth/client/ExcerptInputStream.java b/core/src/main/java/net/oauth/client/ExcerptInputStream.java
new file mode 100755
index 0000000..0dae3c3
--- /dev/null
+++ b/core/src/main/java/net/oauth/client/ExcerptInputStream.java
@@ -0,0 +1,45 @@
+package net.oauth.client;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/** 
+ * A decorator that retains a copy of the first few bytes of data. 
+ * @hide
+ */
+public class ExcerptInputStream extends BufferedInputStream
+{
+    /**
+     * A marker that's appended to the excerpt if it's less than the complete
+     * stream.
+     */
+    public static final byte[] ELLIPSIS = " ...".getBytes();
+
+    public ExcerptInputStream(InputStream in) throws IOException {
+        super(in);
+        mark(LIMIT);
+        int total = 0;
+        int read;
+        while ((read = read(excerpt, total, LIMIT - total)) != -1 && ((total += read) < LIMIT));
+        if (total == LIMIT) {
+            // Only add the ellipsis if there are at least LIMIT bytes
+            System.arraycopy(ELLIPSIS, 0, excerpt, total, ELLIPSIS.length);
+        } else {
+            byte[] tmp = new byte[total];
+            System.arraycopy(excerpt, 0, tmp, 0, total);
+            excerpt = tmp;
+        }
+        reset();
+    }
+
+    private static final int LIMIT = 1024;
+    private byte[] excerpt = new byte[LIMIT + ELLIPSIS.length];
+
+    /** The first few bytes of data, plus ELLIPSIS if there are more bytes. */
+    public byte[] getExcerpt()
+    {
+        return excerpt;
+    }
+
+}