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// Copyright 2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.codereview.manager.unpack;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
/** Buffering input stream which can read entire lines. */
class RecordInputStream extends InputStream {
private InputStream in;
private byte[] buf;
private int pos;
private int end;
RecordInputStream(final InputStream in) {
this.in = in;
buf = new byte[4096];
}
@Override
public void close() throws IOException {
try {
in.close();
} finally {
in = null;
buf = null;
}
}
private boolean fill() throws IOException {
pos = 0;
end = in.read(buf, pos, buf.length);
if (end < 0) {
end = 0;
return false;
}
return true;
}
@Override
public int read() throws IOException {
if (pos == end && !fill()) {
return -1;
}
return buf[pos++];
}
@Override
public int read(final byte[] b, final int off, final int len)
throws IOException {
if (pos == end && !fill()) {
return -1;
}
final int cnt = Math.min(len, end - pos);
System.arraycopy(buf, pos, b, off, cnt);
pos += cnt;
return cnt;
}
/**
* Read a record terminated by the separator byte.
*
* @param sep byte which delimits the end of a record.
* @return record content, with the separator removed from the end. The empty
* array indicates an empty record; null indicates stream EOF.
* @throws IOException the stream could not be read from.
*/
byte[] readRecord(final int sep) throws IOException {
if (pos == end && !fill()) {
return null;
}
byte[] line = fastReadRecord(sep);
if (line != null) {
return line;
}
if (end - pos <= buf.length / 2) {
int cnt = end - pos;
System.arraycopy(buf, pos, buf, 0, cnt);
pos = 0;
end = cnt;
cnt = in.read(buf, end, buf.length - end);
if (cnt < 0) {
final byte[] r = new byte[end];
System.arraycopy(buf, 0, r, 0, end);
pos = end = 0;
return r;
}
end += cnt;
line = fastReadRecord(sep);
if (line != null) {
return line;
}
}
final ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write(buf, pos, end - pos);
for (;;) {
if (!fill()) {
return out.toByteArray();
}
for (int lf = pos; lf < end; lf++) {
if (buf[lf] == sep) {
out.write(buf, pos, lf - pos);
pos = lf + 1;
return out.toByteArray();
}
}
out.write(buf, pos, end - pos);
pos = end;
}
}
private byte[] fastReadRecord(final int sep) {
for (int lf = pos; lf < end; lf++) {
if (buf[lf] == sep) {
final int cnt = lf - pos;
final byte[] r = new byte[cnt];
System.arraycopy(buf, pos, r, 0, cnt);
pos = lf + 1;
return r;
}
}
return null;
}
}
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