/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.tom_roush.pdfbox.pdfparser;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
/**
* A SequentialSource backed by an InputStream.
*/
final class InputStreamSource implements SequentialSource
{
private final PushbackInputStream input;
private int position;
/**
* Constructor.
*
* @param input The input stream to wrap.
*/
InputStreamSource(InputStream input)
{
this.input = new PushbackInputStream(input, 32767); // maximum length of a PDF string
this.position = 0;
}
@Override
public int read() throws IOException
{
int b = input.read();
position++;
return b;
}
@Override
public int read(byte[] b) throws IOException
{
int n = input.read(b);
position += n;
return n;
}
@Override
public int read(byte[] b, int offset, int length) throws IOException
{
int n = input.read(b, offset, length);
position += n;
return n;
}
@Override
public long getPosition() throws IOException
{
return position;
}
@Override
public int peek() throws IOException
{
int b = input.read();
if (b != -1)
{
input.unread(b);
}
return b;
}
@Override
public void unread(int b) throws IOException
{
input.unread(b);
position--;
}
@Override
public void unread(byte[] bytes) throws IOException
{
input.unread(bytes);
position -= bytes.length;
}
@Override
public byte[] readFully(int length) throws IOException
{
byte[] bytes = new byte[length];
int off = 0;
int len = length;
while (len > 0)
{
int n = this.read(bytes, off, len);
off += n;
len -= n;
position += n;
}
return bytes;
}
@Override
public boolean isEOF() throws IOException
{
return peek() == -1;
}
@Override
public void close() throws IOException
{
input.close();
}
}