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77 lines
2.9 KiB
77 lines
2.9 KiB
/*
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* Copyright (C) 2011 Arunesh Mathur
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*
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* This file is a part of zimreader-java.
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*
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* zimreader-java is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3.0 as
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* published by the Free Software Foundation.
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*
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* zimreader-java 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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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with zimreader-java. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.openzim;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* @author Arunesh Mathur
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* A ZIM file implementation that stores the Header and the MIMETypeList
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*
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* @author Michael Christen
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* int/long bugfix (did reading of long values with int variables, causing negative offsets)
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*/
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public class Utilities {
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public static int toTwoLittleEndianInteger(final byte[] buffer) throws IOException {
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if (buffer.length < 2) {
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throw new OutOfMemoryError("buffer too small");
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} else {
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final int result =
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((buffer[0] & 0xFF) | ((buffer[1] & 0xFF) << 8));
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return result;
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}
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}
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public static int toFourLittleEndianInteger(final byte[] buffer) throws IOException {
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if (buffer.length < 4) {
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throw new OutOfMemoryError("buffer too small");
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} else {
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final int result =
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((buffer[0] & 0xFF) | ((buffer[1] & 0xFF) << 8)
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| ((buffer[2] & 0xFF) << 16) | ((buffer[3] & 0xFF) << 24));
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return result;
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}
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}
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public static long toEightLittleEndianLong(final byte[] buffer) throws IOException {
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if (buffer.length < 8) {
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throw new OutOfMemoryError("buffer too small");
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} else {
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final long result = // cast to long required otherwise this is again an integer
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((long)(buffer[0] & 0xFF) | ((long)(buffer[1] & 0xFF) << 8)
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| ((long)(buffer[2] & 0xFF) << 16) | ((long)(buffer[3] & 0xFF) << 24)
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| ((long)(buffer[4] & 0xFF) << 32) | ((long)(buffer[5] & 0xFF) << 40)
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| ((long)(buffer[6] & 0xFF) << 48) | ((long)(buffer[7] & 0xFF) << 56));
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return result;
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}
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}
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public static long toSixteenLittleEndianLong(final byte[] buffer) throws IOException {
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return toEightLittleEndianLong(buffer); // there are no sixten bytes long values
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}
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public static void skipFully(final InputStream stream, final long bytes) throws IOException {
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for (long i = stream.skip(bytes); i < bytes; i += stream.skip(bytes - i));
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}
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}
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