| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * 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. |
| */ |
| |
| /* |
| * @author max |
| */ |
| package com.intellij.util.io; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| public class LimitedInputStream extends FilterInputStream { |
| private final int myReadLimit; |
| private int myBytesRead; |
| |
| public LimitedInputStream(final InputStream in, final int readLimit) { |
| super(in); |
| myReadLimit = readLimit; |
| myBytesRead = 0; |
| } |
| |
| public boolean markSupported() { |
| return false; |
| } |
| |
| public int read() throws IOException { |
| if (myBytesRead == myReadLimit) return -1; |
| final int r = super.read(); |
| if (r >= 0) myBytesRead++; |
| return r; |
| } |
| |
| public int read(byte[] b) throws IOException { |
| return read(b, 0, b.length); |
| } |
| |
| public int read(byte[] b, int off, int len) throws IOException { |
| if (myBytesRead >= myReadLimit) return -1; |
| len = Math.min(len, myReadLimit - myBytesRead); |
| if (len <= 0) return -1; |
| |
| final int actuallyRead = super.read(b, off, len); |
| if (actuallyRead >= 0) myBytesRead += actuallyRead; |
| |
| return actuallyRead; |
| } |
| |
| public long skip(long n) throws IOException { |
| n = Math.min(n, myReadLimit - myBytesRead); |
| if (n <= 0) return 0; |
| |
| final long skipped = super.skip(n); |
| myBytesRead += skipped; |
| return skipped; |
| } |
| |
| public int available() throws IOException { |
| return Math.min(super.available(), myReadLimit - myBytesRead); |
| } |
| |
| protected int remainingLimit() { |
| return myReadLimit - myBytesRead; |
| } |
| |
| public synchronized void mark(final int readLimit) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public synchronized void reset() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| } |