81 lines
2.2 KiB
Java
81 lines
2.2 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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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 com.android.email;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* A filtering InputStream that stops allowing reads after the given length has been read. This
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* is used to allow a client to read directly from an underlying protocol stream without reading
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* past where the protocol handler intended the client to read.
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*/
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public class FixedLengthInputStream extends InputStream {
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private final InputStream mIn;
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private final int mLength;
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private int mCount;
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public FixedLengthInputStream(InputStream in, int length) {
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this.mIn = in;
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this.mLength = length;
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}
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@Override
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public int available() throws IOException {
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return mLength - mCount;
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}
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@Override
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public int read() throws IOException {
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if (mCount < mLength) {
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mCount++;
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return mIn.read();
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} else {
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return -1;
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}
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}
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@Override
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public int read(byte[] b, int offset, int length) throws IOException {
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if (mCount < mLength) {
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int d = mIn.read(b, offset, Math.min(mLength - mCount, length));
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if (d == -1) {
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return -1;
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} else {
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mCount += d;
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return d;
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}
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} else {
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return -1;
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}
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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 read(b, 0, b.length);
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}
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public int getLength() {
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return mLength;
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}
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@Override
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public String toString() {
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return String.format("FixedLengthInputStream(in=%s, length=%d)", mIn.toString(), mLength);
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}
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}
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