ea80704598
"full" is the original F-Droid app with all the features. It should still build the exact same app after this change. "basic" is the smallest version of F-Droid possible. It does not yet build, nor work.
142 lines
4.2 KiB
Java
142 lines
4.2 KiB
Java
/*
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* Copyright (C) 2010 Ken Ellinwood
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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 kellinwood.zipio;
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import kellinwood.logging.LoggerInterface;
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import kellinwood.logging.LoggerManager;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.RandomAccessFile;
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import java.util.Locale;
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/**
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* Input stream used to read just the data from a zip file entry.
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*/
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public class ZioEntryInputStream extends InputStream {
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RandomAccessFile raf;
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int size;
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int offset;
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LoggerInterface log;
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boolean debug;
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boolean returnDummyByte = false;
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OutputStream monitor = null;
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public ZioEntryInputStream(ZioEntry entry) throws IOException {
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log = LoggerManager.getLogger(this.getClass().getName());
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debug = log.isDebugEnabled();
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offset = 0;
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size = entry.getCompressedSize();
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raf = entry.getZipInput().in;
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long dpos = entry.getDataPosition();
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if (dpos >= 0) {
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if (debug) log.debug(String.format(Locale.ENGLISH, "Seeking to %d", entry.getDataPosition()));
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raf.seek(entry.getDataPosition());
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} else {
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// seeks to, then reads, the local header, causing the
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// file pointer to be positioned at the start of the data.
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entry.readLocalHeader();
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}
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}
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public void setReturnDummyByte(boolean returnExtraByte) {
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returnDummyByte = returnExtraByte;
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}
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// For debugging, if the monitor is set we write all data read to the monitor.
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public void setMonitorStream(OutputStream monitorStream) {
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monitor = monitorStream;
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}
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@Override
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public void close() throws IOException {
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}
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@Override
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public boolean markSupported() {
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return false;
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}
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@Override
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public int available() throws IOException {
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int available = size - offset;
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if (debug) log.debug(String.format(Locale.ENGLISH, "Available = %d", available));
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if (available == 0 && returnDummyByte) return 1;
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else return available;
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}
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@Override
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public int read() throws IOException {
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if ((size - offset) == 0) {
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if (returnDummyByte) {
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returnDummyByte = false;
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return 0;
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} else return -1;
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}
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int b = raf.read();
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if (b >= 0) {
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if (monitor != null) monitor.write(b);
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if (debug) log.debug("Read 1 byte");
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offset += 1;
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} else if (debug) log.debug("Read 0 bytes");
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return b;
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}
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@Override
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public int read(byte[] b, int off, int len) throws IOException {
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return readBytes(b, off, len);
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}
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private int readBytes(byte[] b, int off, int len) throws IOException {
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if ((size - offset) == 0) {
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if (returnDummyByte) {
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returnDummyByte = false;
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b[off] = 0;
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return 1;
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} else return -1;
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}
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int numToRead = Math.min(len, available());
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int numRead = raf.read(b, off, numToRead);
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if (numRead > 0) {
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if (monitor != null) monitor.write(b, off, numRead);
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offset += numRead;
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}
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if (debug) log.debug(String.format(Locale.ENGLISH, "Read %d bytes for read(b,%d,%d)", numRead, off, len));
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return numRead;
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}
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@Override
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public int read(byte[] b) throws IOException {
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return readBytes(b, 0, b.length);
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}
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@Override
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public long skip(long n) throws IOException {
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long numToSkip = Math.min(n, available());
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raf.seek(raf.getFilePointer() + numToSkip);
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if (debug) log.debug(String.format(Locale.ENGLISH, "Skipped %d bytes", numToSkip));
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return numToSkip;
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}
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}
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