1 files changed, 36 insertions, 0 deletions
diff --git a/Homework/cs5300/project-one/p1-scanner/scanner/ScanStream.java b/Homework/cs5300/project-one/p1-scanner/scanner/ScanStream.java
new file mode 100644
index 0000000..04cff68
--- /dev/null
+++ b/Homework/cs5300/project-one/p1-scanner/scanner/ScanStream.java
@@ -0,0 +1,36 @@
+/*
+ * DO NOT MODIFY THIS FILE
+ */
+package scanner;
+
+/**
+ * Abstracts a stream reader that reads one byte at a time with possible
+ * rollback.
+ *
+ * Do not modify this file.
+ */
+public final class ScanStream {
+
+  final private byte[] data;
+  private int i;
+
+  public ScanStream(byte[] data) {
+    this.data = data;
+    i = 0;
+  }
+
+  public boolean eof() {
+    return i >= data.length;
+  }
+
+  public char next() {
+    if (eof()) {
+      throw new RuntimeException("EOF reached");
+    }
+    return (char) data[i++];
+  }
+
+  void rollback() {
+    --i;
+  }
+}