125 lines
3.3 KiB
Java
125 lines
3.3 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.util.http.parser;
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import java.io.IOException;
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import java.io.StringReader;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class Ranges {
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private final String units;
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private final List<Entry> entries;
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private Ranges(String units, List<Entry> entries) {
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this.units = units;
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this.entries = Collections.unmodifiableList(entries);
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}
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public List<Entry> getEntries() {
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return entries;
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}
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public String getUnits() {
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return units;
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}
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public static class Entry {
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private final long start;
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private final long end;
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public Entry(long start, long end) {
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this.start = start;
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this.end = end;
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}
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public long getStart() {
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return start;
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}
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public long getEnd() {
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return end;
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}
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}
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/**
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* Parses a Range header from an HTTP header.
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*
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* @param input a reader over the header text
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*
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* @return a set of ranges parsed from the input, or null if not valid
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*
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* @throws IOException if there was a problem reading the input
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*/
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public static Ranges parse(StringReader input) throws IOException {
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// Units (required)
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String units = HttpParser.readToken(input);
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if (units == null || units.length() == 0) {
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return null;
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}
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// Must be followed by '='
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if (HttpParser.skipConstant(input, "=") == SkipResult.NOT_FOUND) {
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return null;
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}
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// Range entries
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List<Entry> entries = new ArrayList<>();
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SkipResult skipResult;
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do {
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long start = HttpParser.readLong(input);
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// Must be followed by '-'
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if (HttpParser.skipConstant(input, "-") == SkipResult.NOT_FOUND) {
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return null;
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}
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long end = HttpParser.readLong(input);
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if (start == -1 && end == -1) {
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// Invalid range
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return null;
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}
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entries.add(new Entry(start, end));
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skipResult = HttpParser.skipConstant(input, ",");
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if (skipResult == SkipResult.NOT_FOUND) {
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// Invalid range
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return null;
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}
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} while (skipResult == SkipResult.FOUND);
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// There must be at least one entry
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if (entries.size() == 0) {
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return null;
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}
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return new Ranges(units, entries);
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}
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}
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