com.lowagie.text.pdf.RandomAccessFileOrArray Maven / Gradle / Ivy
/*
* $Id: RandomAccessFileOrArray.java 3488 2008-06-02 14:19:26Z blowagie $
*
* Copyright 2001, 2002 Paulo Soares
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.URL;
import java.nio.channels.FileChannel;
import com.lowagie.text.Document;
/**
* An implementation of a RandomAccessFile for input only
* that accepts a file or a byte array as data source.
*
* @author Paulo Soares ([email protected])
*/
public class RandomAccessFileOrArray implements DataInput {
MappedRandomAccessFile rf;
RandomAccessFile trf;
boolean plainRandomAccess;
String filename;
byte arrayIn[];
int arrayInPtr;
byte back;
boolean isBack = false;
/** Holds value of property startOffset. */
private int startOffset = 0;
public RandomAccessFileOrArray(String filename) throws IOException {
this(filename, false, Document.plainRandomAccess);
}
public RandomAccessFileOrArray(String filename, boolean forceRead, boolean plainRandomAccess) throws IOException {
this.plainRandomAccess = plainRandomAccess;
File file = new File(filename);
if (!file.canRead()) {
if (filename.startsWith("file:/") || filename.startsWith("http://") ||
filename.startsWith("https://") || filename.startsWith("jar:") || filename.startsWith("wsjar:")) {
InputStream is = new URL(filename).openStream();
try {
this.arrayIn = InputStreamToArray(is);
return;
} finally {
try {
is.close();
} catch (IOException ioe) {
}
}
} else {
InputStream is;
if (filename.equals("-"))
is = System.in;
else
is = BaseFont.getResourceStream(filename);
if (is == null)
throw new IOException(filename + " not found as file or resource.");
try {
this.arrayIn = InputStreamToArray(is);
return;
} finally {
try {
is.close();
} catch (IOException ioe) {
}
}
}
} else if (forceRead) {
InputStream s = null;
try {
s = new FileInputStream(file);
this.arrayIn = InputStreamToArray(s);
} finally {
try {
if (s != null) {
s.close();
}
} catch (Exception e) {
}
}
return;
}
this.filename = filename;
if (plainRandomAccess)
trf = new RandomAccessFile(filename, "r");
else
rf = new MappedRandomAccessFile(filename, "r");
}
public RandomAccessFileOrArray(URL url) throws IOException {
InputStream is = url.openStream();
try {
this.arrayIn = InputStreamToArray(is);
} finally {
try {
is.close();
} catch (IOException ioe) {
}
}
}
public RandomAccessFileOrArray(InputStream is) throws IOException {
this.arrayIn = InputStreamToArray(is);
}
public static byte[] InputStreamToArray(InputStream is) throws IOException {
byte b[] = new byte[8192];
ByteArrayOutputStream out = new ByteArrayOutputStream();
while (true) {
int read = is.read(b);
if (read < 1)
break;
out.write(b, 0, read);
}
out.close();
return out.toByteArray();
}
public RandomAccessFileOrArray(byte arrayIn[]) {
this.arrayIn = arrayIn;
}
public RandomAccessFileOrArray(RandomAccessFileOrArray file) {
filename = file.filename;
arrayIn = file.arrayIn;
startOffset = file.startOffset;
plainRandomAccess = file.plainRandomAccess;
}
public void pushBack(byte b) {
back = b;
isBack = true;
}
public int read() throws IOException {
if (isBack) {
isBack = false;
return back & 0xff;
}
if (arrayIn == null)
return plainRandomAccess ? trf.read() : rf.read();
else {
if (arrayInPtr >= arrayIn.length)
return -1;
return arrayIn[arrayInPtr++] & 0xff;
}
}
public int read(byte[] b, int off, int len) throws IOException {
if (len == 0)
return 0;
int n = 0;
if (isBack) {
isBack = false;
if (len == 1) {
b[off] = back;
return 1;
} else {
n = 1;
b[off++] = back;
--len;
}
}
if (arrayIn == null) {
return (plainRandomAccess ? trf.read(b, off, len) : rf.read(b, off, len)) + n;
} else {
if (arrayInPtr >= arrayIn.length)
return -1;
if (arrayInPtr + len > arrayIn.length)
len = arrayIn.length - arrayInPtr;
System.arraycopy(arrayIn, arrayInPtr, b, off, len);
arrayInPtr += len;
return len + n;
}
}
public int read(byte b[]) throws IOException {
return read(b, 0, b.length);
}
public void readFully(byte b[]) throws IOException {
readFully(b, 0, b.length);
}
public void readFully(byte b[], int off, int len) throws IOException {
int n = 0;
do {
int count = read(b, off + n, len - n);
if (count < 0)
throw new EOFException();
n += count;
} while (n < len);
}
public long skip(long n) throws IOException {
return skipBytes((int) n);
}
public int skipBytes(int n) throws IOException {
if (n <= 0) {
return 0;
}
int adj = 0;
if (isBack) {
isBack = false;
if (n == 1) {
return 1;
} else {
--n;
adj = 1;
}
}
int pos;
int len;
int newpos;
pos = getFilePointer();
len = length();
newpos = pos + n;
if (newpos > len) {
newpos = len;
}
seek(newpos);
/* return the actual number of bytes skipped */
return newpos - pos + adj;
}
public void reOpen() throws IOException {
if (filename != null && rf == null && trf == null) {
if (plainRandomAccess)
trf = new RandomAccessFile(filename, "r");
else
rf = new MappedRandomAccessFile(filename, "r");
}
seek(0);
}
protected void insureOpen() throws IOException {
if (filename != null && rf == null && trf == null) {
reOpen();
}
}
public boolean isOpen() {
return (filename == null || rf != null || trf != null);
}
public void close() throws IOException {
isBack = false;
if (rf != null) {
rf.close();
rf = null;
// it's very expensive to open a memory mapped file and for the usage pattern of this class
// in iText it's faster the next re-openings to be done as a plain random access
// file
plainRandomAccess = true;
} else if (trf != null) {
trf.close();
trf = null;
}
}
public int length() throws IOException {
if (arrayIn == null) {
insureOpen();
return (int) (plainRandomAccess ? trf.length() : rf.length()) - startOffset;
} else
return arrayIn.length - startOffset;
}
public void seek(int pos) throws IOException {
pos += startOffset;
isBack = false;
if (arrayIn == null) {
insureOpen();
if (plainRandomAccess)
trf.seek(pos);
else
rf.seek(pos);
} else
arrayInPtr = pos;
}
public void seek(long pos) throws IOException {
seek((int) pos);
}
public int getFilePointer() throws IOException {
insureOpen();
int n = isBack ? 1 : 0;
if (arrayIn == null) {
return (int) (plainRandomAccess ? trf.getFilePointer() : rf.getFilePointer()) - n - startOffset;
} else
return arrayInPtr - n - startOffset;
}
public boolean readBoolean() throws IOException {
int ch = this.read();
if (ch < 0)
throw new EOFException();
return (ch != 0);
}
public byte readByte() throws IOException {
int ch = this.read();
if (ch < 0)
throw new EOFException();
return (byte) (ch);
}
public int readUnsignedByte() throws IOException {
int ch = this.read();
if (ch < 0)
throw new EOFException();
return ch;
}
public short readShort() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (short) ((ch1 << 8) + ch2);
}
/**
* Reads a signed 16-bit number from this stream in little-endian order.
* The method reads two
* bytes from this stream, starting at the current stream pointer.
* If the two bytes read, in order, are
* b1 and b2, where each of the two values is
* between 0 and 255, inclusive, then the
* result is equal to:
*
*
*
* (short) ((b2 << 8) | b1)
*
*
*
*
* This method blocks until the two bytes are read, the end of the
* stream is detected, or an exception is thrown.
*
* @return the next two bytes of this stream, interpreted as a signed
* 16-bit number.
* @exception EOFException if this stream reaches the end before reading
* two bytes.
* @exception IOException if an I/O error occurs.
*/
public final short readShortLE() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (short) ((ch2 << 8) + (ch1 << 0));
}
public int readUnsignedShort() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (ch1 << 8) + ch2;
}
/**
* Reads an unsigned 16-bit number from this stream in little-endian order.
* This method reads
* two bytes from the stream, starting at the current stream pointer.
* If the bytes read, in order, are
* b1 and b2, where
* 0 <= b1, b2 <= 255,
* then the result is equal to:
*
*
*
* (b2 << 8) | b1
*
*
*
*
* This method blocks until the two bytes are read, the end of the
* stream is detected, or an exception is thrown.
*
* @return the next two bytes of this stream, interpreted as an
* unsigned 16-bit integer.
* @exception EOFException if this stream reaches the end before reading
* two bytes.
* @exception IOException if an I/O error occurs.
*/
public final int readUnsignedShortLE() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (ch2 << 8) + (ch1 << 0);
}
public char readChar() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (char) ((ch1 << 8) + ch2);
}
/**
* Reads a Unicode character from this stream in little-endian order.
* This method reads two
* bytes from the stream, starting at the current stream pointer.
* If the bytes read, in order, are
* b1 and b2, where
* 0 <= b1, b2 <= 255,
* then the result is equal to:
*
*
*
* (char) ((b2 << 8) | b1)
*
*
*
*
* This method blocks until the two bytes are read, the end of the
* stream is detected, or an exception is thrown.
*
* @return the next two bytes of this stream as a Unicode character.
* @exception EOFException if this stream reaches the end before reading
* two bytes.
* @exception IOException if an I/O error occurs.
*/
public final char readCharLE() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (char) ((ch2 << 8) + (ch1 << 0));
}
public int readInt() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
int ch3 = this.read();
int ch4 = this.read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EOFException();
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4);
}
/**
* Reads a signed 32-bit integer from this stream in little-endian order.
* This method reads 4
* bytes from the stream, starting at the current stream pointer.
* If the bytes read, in order, are b1,
* b2, b3, and b4, where
* 0 <= b1, b2, b3, b4 <= 255,
* then the result is equal to:
*
*
*
* (b4 << 24) | (b3 << 16) + (b2 << 8) + b1
*
*
*
*
* This method blocks until the four bytes are read, the end of the
* stream is detected, or an exception is thrown.
*
* @return the next four bytes of this stream, interpreted as an
* int.
* @exception EOFException if this stream reaches the end before reading
* four bytes.
* @exception IOException if an I/O error occurs.
*/
public final int readIntLE() throws IOException {
int ch1 = this.read();
int ch2 = this.read();
int ch3 = this.read();
int ch4 = this.read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EOFException();
return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + (ch1 << 0));
}
/**
* Reads an unsigned 32-bit integer from this stream. This method reads 4
* bytes from the stream, starting at the current stream pointer.
* If the bytes read, in order, are b1,
* b2, b3, and b4, where
* 0 <= b1, b2, b3, b4 <= 255,
* then the result is equal to:
*
*
*
* (b1 << 24) | (b2 << 16) + (b3 << 8) + b4
*
*
*
*
* This method blocks until the four bytes are read, the end of the
* stream is detected, or an exception is thrown.
*
* @return the next four bytes of this stream, interpreted as a
* long.
* @exception EOFException if this stream reaches the end before reading
* four bytes.
* @exception IOException if an I/O error occurs.
*/
public final long readUnsignedInt() throws IOException {
long ch1 = this.read();
long ch2 = this.read();
long ch3 = this.read();
long ch4 = this.read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EOFException();
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
}
public final long readUnsignedIntLE() throws IOException {
long ch1 = this.read();
long ch2 = this.read();
long ch3 = this.read();
long ch4 = this.read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EOFException();
return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + (ch1 << 0));
}
public long readLong() throws IOException {
return ((long) (readInt()) << 32) + (readInt() & 0xFFFFFFFFL);
}
public final long readLongLE() throws IOException {
int i1 = readIntLE();
int i2 = readIntLE();
return ((long) i2 << 32) + (i1 & 0xFFFFFFFFL);
}
public float readFloat() throws IOException {
return Float.intBitsToFloat(readInt());
}
public final float readFloatLE() throws IOException {
return Float.intBitsToFloat(readIntLE());
}
public double readDouble() throws IOException {
return Double.longBitsToDouble(readLong());
}
public final double readDoubleLE() throws IOException {
return Double.longBitsToDouble(readLongLE());
}
public String readLine() throws IOException {
StringBuilder input = new StringBuilder();
int c = -1;
boolean eol = false;
while (!eol) {
switch (c = read()) {
case -1:
case '\n':
eol = true;
break;
case '\r':
eol = true;
int cur = getFilePointer();
if ((read()) != '\n') {
seek(cur);
}
break;
default:
input.append((char) c);
break;
}
}
if ((c == -1) && (input.length() == 0)) {
return null;
}
return input.toString();
}
public String readUTF() throws IOException {
return DataInputStream.readUTF(this);
}
/**
* Getter for property startOffset.
*
* @return Value of property startOffset.
*
*/
public int getStartOffset() {
return this.startOffset;
}
/**
* Setter for property startOffset.
*
* @param startOffset New value of property startOffset.
*
*/
public void setStartOffset(int startOffset) {
this.startOffset = startOffset;
}
/**
* @since 2.0.8
*/
public java.nio.ByteBuffer getNioByteBuffer() throws IOException {
if (filename != null) {
FileChannel channel;
if (plainRandomAccess)
channel = trf.getChannel();
else
channel = rf.getChannel();
return channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
}
return java.nio.ByteBuffer.wrap(arrayIn);
}
}