81 lines
2.1 KiB
Java
81 lines
2.1 KiB
Java
|
/*
|
||
|
|
* Copyright (C) 2015 The Android Open Source Project
|
||
|
|
*
|
||
|
|
* 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.android.voicemail.impl.mail;
|
||
|
|
|
||
|
|
import java.io.IOException;
|
||
|
|
import java.io.InputStream;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A filtering InputStream that allows single byte "peeks" without consuming the byte. The client of
|
||
|
|
* this stream can call peek() to see the next available byte in the stream and a subsequent read
|
||
|
|
* will still return the peeked byte.
|
||
|
|
*/
|
||
|
|
public class PeekableInputStream extends InputStream {
|
||
|
|
private final InputStream in;
|
||
|
|
private boolean peeked;
|
||
|
|
private int peekedByte;
|
||
|
|
|
||
|
|
public PeekableInputStream(InputStream in) {
|
||
|
|
this.in = in;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int read() throws IOException {
|
||
|
|
if (!peeked) {
|
||
|
|
return in.read();
|
||
|
|
} else {
|
||
|
|
peeked = false;
|
||
|
|
return peekedByte;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public int peek() throws IOException {
|
||
|
|
if (!peeked) {
|
||
|
|
peekedByte = read();
|
||
|
|
peeked = true;
|
||
|
|
}
|
||
|
|
return peekedByte;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int read(byte[] b, int offset, int length) throws IOException {
|
||
|
|
if (!peeked) {
|
||
|
|
return in.read(b, offset, length);
|
||
|
|
} else {
|
||
|
|
b[0] = (byte) peekedByte;
|
||
|
|
peeked = false;
|
||
|
|
int r = in.read(b, offset + 1, length - 1);
|
||
|
|
if (r == -1) {
|
||
|
|
return 1;
|
||
|
|
} else {
|
||
|
|
return r + 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int read(byte[] b) throws IOException {
|
||
|
|
return read(b, 0, b.length);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public String toString() {
|
||
|
|
return String.format(
|
||
|
|
"PeekableInputStream(in=%s, peeked=%b, peekedByte=%d)", in.toString(), peeked, peekedByte);
|
||
|
|
}
|
||
|
|
}
|