| // Copyright 2010 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.gwtorm.protobuf; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| class CappedInputStream extends InputStream { |
| private final InputStream src; |
| private int remaining; |
| |
| CappedInputStream(InputStream src, int limit) { |
| this.src = src; |
| this.remaining = limit; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| if (0 < remaining) { |
| int r = src.read(); |
| if (r < 0) { |
| remaining = 0; |
| } else { |
| remaining--; |
| } |
| return r; |
| } else { |
| return -1; |
| } |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| if (len == 0) { |
| return 0; |
| } else if (0 < remaining) { |
| int n = src.read(b, off, Math.min(len, remaining)); |
| if (n < 0) { |
| remaining = 0; |
| } else { |
| remaining -= n; |
| } |
| return n; |
| } else { |
| return -1; |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| remaining = 0; |
| src.close(); |
| } |
| } |