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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.federation.http;
import org.apache.http.HttpEntity;
import org.apache.http.entity.HttpEntityWrapper;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.zip.GZIPInputStream;
/**
* Used by HTTPSearcher when talking to services returning compressed content.
*
* @author Mainak Mandal
* @deprecated
*/
// TODO: Remove on Vespa 7
@Deprecated // OK
public class GzipDecompressingEntity extends HttpEntityWrapper {
private static class Resources {
byte [] buffer;
int total;
Resources() {
total = 0;
buffer = new byte[65536];
}
void drain(InputStream zipStream) throws IOException {
int numRead = zipStream.read(buffer, total, buffer.length);
while (numRead != -1) {
total += numRead;
if ((total + 65536) > buffer.length) {
buffer = Arrays.copyOf(buffer, buffer.length + numRead);
}
numRead = zipStream.read(buffer, total, buffer.length - total);
}
}
}
private final Resources resources = new Resources();
public GzipDecompressingEntity(final HttpEntity entity) throws IllegalStateException, IOException {
super(entity);
GZIPInputStream gz = new GZIPInputStream(entity.getContent());
InputStream zipStream = new BufferedInputStream(gz);
try {
resources.drain(zipStream);
} catch (IOException e) {
throw e;
} finally {
zipStream.close();
}
}
@Override
public InputStream getContent() throws IOException, IllegalStateException {
final ByteBuffer buff = ByteBuffer.wrap(resources.buffer, 0, resources.total);
return new InputStream() {
@Override
public int available() throws IOException {
return buff.remaining();
}
@Override
public int read() throws IOException {
if (buff.hasRemaining())
return buff.get() & 0xFF;
return -1;
}
@Override
public int read(byte[] b) throws IOException {
if (!buff.hasRemaining())
return -1;
int len = b.length;
if (len > buff.remaining())
len = buff.remaining();
buff.get(b, 0, len);
return len;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (!buff.hasRemaining())
return -1;
if (len > buff.remaining())
len = buff.remaining();
buff.get(b, off, len);
return len;
}
@Override
public long skip(long n) throws IOException {
if (!buff.hasRemaining())
return -1;
if (n > buff.remaining())
n = buff.remaining();
buff.position(buff.position() + (int) n);
return n;
}
};
}
@Override
public long getContentLength() {
return resources.total;
}
@Override
public void writeTo(OutputStream outstream) throws IOException {
outstream.write(resources.buffer, 0, resources.total);
}
}
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