init

java/org/apache/tomcat/util/http/parser/ContentRange.java

@@ -0,0 +1,108 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.apache.tomcat.util.http.parser;
+
+import java.io.IOException;
+import java.io.StringReader;
+
+public class ContentRange {
+
+    private final String units;
+    private final long start;
+    private final long end;
+    private final long length;
+
+
+    public ContentRange(String units, long start, long end, long length) {
+        this.units = units;
+        this.start = start;
+        this.end = end;
+        this.length = length;
+    }
+
+
+    public String getUnits() {
+        return units;
+    }
+
+
+    public long getStart() {
+        return start;
+    }
+
+
+    public long getEnd() {
+        return end;
+    }
+
+
+    public long getLength() {
+        return length;
+    }
+
+
+    /**
+     * Parses a Content-Range header from an HTTP header.
+     *
+     * @param input a reader over the header text
+     *
+     * @return the range parsed from the input, or null if not valid
+     *
+     * @throws IOException if there was a problem reading the input
+     */
+    public static ContentRange parse(StringReader input) throws IOException {
+        // Units (required)
+        String units = HttpParser.readToken(input);
+        if (units == null || units.length() == 0) {
+            return null;
+        }
+
+        // Must be followed by '='
+        if (HttpParser.skipConstant(input, "=") == SkipResult.NOT_FOUND) {
+            return null;
+        }
+
+        // Start
+        long start = HttpParser.readLong(input);
+
+        // Must be followed by '-'
+        if (HttpParser.skipConstant(input, "-") == SkipResult.NOT_FOUND) {
+            return null;
+        }
+
+        // End
+        long end = HttpParser.readLong(input);
+
+        // Must be followed by '/'
+        if (HttpParser.skipConstant(input, "/") == SkipResult.NOT_FOUND) {
+            return null;
+        }
+
+        // Length
+        long length = HttpParser.readLong(input);
+
+        // Doesn't matter what we look for, result should be EOF
+        SkipResult skipResult = HttpParser.skipConstant(input, "X");
+
+        if (skipResult != SkipResult.EOF) {
+            // Invalid range
+            return null;
+        }
+
+        return new ContentRange(units, start, end, length);
+    }
+}