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122 lines
3.8 KiB
122 lines
3.8 KiB
/*
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This file is part of Airsonic.
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Airsonic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Airsonic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Airsonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2016 (C) Airsonic Authors
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Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
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*/
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package org.airsonic.player.util;
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import org.apache.commons.lang.StringUtils;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* @author Sindre Mehus
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* @version $Id$
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*/
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public class HttpRange {
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private static final Pattern PATTERN = Pattern.compile("bytes=(\\d+)-(\\d*)");
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private final Long firstBytePos;
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private final Long lastBytePos;
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/**
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* Parses the given string as a HTTP header byte range. See chapter 14.36.1 in RFC 2068
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* for details.
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* <p/>
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* Only a subset of the allowed syntaxes are supported. Only ranges which specify first-byte-pos
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* are supported. The last-byte-pos is optional.
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*
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* @param range The range from the HTTP header, for instance "bytes=0-499" or "bytes=500-"
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* @return A range object (using inclusive values). If the last-byte-pos is not given, the end of
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* the returned range is {@code null}. The method returns <code>null</code> if the syntax
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* of the given range is not supported.
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*/
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public static HttpRange valueOf(String range) {
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if (range == null) {
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return null;
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}
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Matcher matcher = PATTERN.matcher(range);
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if (matcher.matches()) {
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String firstString = matcher.group(1);
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String lastString = StringUtils.trimToNull(matcher.group(2));
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long first = Long.parseLong(firstString);
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Long last = lastString == null ? null : Long.parseLong(lastString);
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if (last != null && first > last) {
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return null;
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}
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return new HttpRange(first, last);
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}
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return null;
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}
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public HttpRange(long firstBytePos, Long lastBytePos) {
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this.firstBytePos = firstBytePos;
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this.lastBytePos = lastBytePos;
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}
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/**
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* @return The first byte position (inclusive) in the range. Never {@code null}.
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*/
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public Long getFirstBytePos() {
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return firstBytePos;
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}
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/**
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* @return The last byte position (inclusive) in the range. Can be {@code null}.
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*/
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public Long getLastBytePos() {
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return lastBytePos;
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}
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/**
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* @return Whether this is a closed range (both first and last byte position specified).
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*/
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public boolean isClosed() {
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return firstBytePos != null && lastBytePos != null;
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}
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/**
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* @return The size in bytes if the range is closed, -1 otherwise.
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*/
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public long size() {
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return isClosed() ? (lastBytePos - firstBytePos + 1) : -1;
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}
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/**
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* @return Returns whether the given byte position is within this range.
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*/
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public boolean contains(long pos) {
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if (pos < firstBytePos) {
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return false;
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}
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return lastBytePos == null || pos <= lastBytePos;
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}
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@Override
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public String toString() {
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StringBuilder builder = new StringBuilder();
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builder.append(firstBytePos).append('-');
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if (lastBytePos != null) {
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builder.append(lastBytePos);
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}
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return builder.toString();
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}
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}
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