com.itextpdf.kernel.pdf.MemoryLimitsAwareOutputStream Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
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Authors: iText Software.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
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following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
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or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
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*/
package com.itextpdf.kernel.pdf;
import com.itextpdf.kernel.exceptions.KernelExceptionMessageConstant;
import com.itextpdf.kernel.exceptions.MemoryLimitsAwareException;
import java.io.ByteArrayOutputStream;
import java.util.Arrays;
/**
* This class implements an output stream which can be used for memory limits aware decompression of pdf streams.
*/
class MemoryLimitsAwareOutputStream extends ByteArrayOutputStream {
/**
* The maximum size of array to allocate.
* Attempts to allocate larger arrays will result in an exception.
*/
private static final int DEFAULT_MAX_STREAM_SIZE = Integer.MAX_VALUE - 8;
/**
* The maximum size of array to allocate.
* Attempts to allocate larger arrays will result in an exception.
*/
private int maxStreamSize = DEFAULT_MAX_STREAM_SIZE;
/**
* Creates a new byte array output stream. The buffer capacity is
* initially 32 bytes, though its size increases if necessary.
*/
public MemoryLimitsAwareOutputStream() {
super();
}
/**
* Creates a new byte array output stream, with a buffer capacity of
* the specified size, in bytes.
*
* @param size the initial size.
* @throws IllegalArgumentException if size is negative.
*/
public MemoryLimitsAwareOutputStream(int size) {
super(size);
}
/**
* Gets the maximum size which can be occupied by this output stream.
*
* @return the maximum size which can be occupied by this output stream.
*/
public long getMaxStreamSize() {
return maxStreamSize;
}
/**
* Sets the maximum size which can be occupied by this output stream.
*
* @param maxStreamSize the maximum size which can be occupied by this output stream.
* @return this {@link MemoryLimitsAwareOutputStream}
*/
public MemoryLimitsAwareOutputStream setMaxStreamSize(int maxStreamSize) {
this.maxStreamSize = maxStreamSize;
return this;
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void write(byte[] b, int off, int len) {
// NOTE: in case this method is updated, the ManualCompressionTest should be run!
if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) - b.length > 0)) {
throw new IndexOutOfBoundsException();
}
int minCapacity = count + len;
if (minCapacity < 0) {
// overflow
throw new MemoryLimitsAwareException(
KernelExceptionMessageConstant.DURING_DECOMPRESSION_SINGLE_STREAM_OCCUPIED_MORE_THAN_MAX_INTEGER_VALUE);
}
if (minCapacity > maxStreamSize) {
throw new MemoryLimitsAwareException(
KernelExceptionMessageConstant.DURING_DECOMPRESSION_SINGLE_STREAM_OCCUPIED_MORE_MEMORY_THAN_ALLOWED);
}
// calculate new capacity
int oldCapacity = buf.length;
int newCapacity = oldCapacity << 1;
if (newCapacity < 0 || newCapacity - minCapacity < 0) {
// overflow
newCapacity = minCapacity;
}
if (newCapacity - maxStreamSize > 0) {
newCapacity = maxStreamSize;
buf = Arrays.copyOf(buf, newCapacity);
}
super.write(b, off, len);
}
}