using System;
using System.IO;
using System.Text;
using System.Net;
/*
* $Id: RandomAccessFileOrArray.cs,v 1.8 2007/09/07 13:36:02 psoares33 Exp $
* $Name: $
*
* 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/
*/
namespace iTextSharp.text.pdf {
/** An implementation of a RandomAccessFile for input only
* that accepts a file or a byte array as data source.
*
* @author Paulo Soares (psoares@consiste.pt)
*/
public class RandomAccessFileOrArray {
internal FileStream rf;
internal String filename;
internal byte[] arrayIn;
internal int arrayInPtr;
internal byte back;
internal bool isBack = false;
/** Holds value of property startOffset. */
private int startOffset = 0;
public RandomAccessFileOrArray(String filename) : this(filename, false) {
}
public RandomAccessFileOrArray(String filename, bool forceRead) {
if (!File.Exists(filename)) {
if (filename.StartsWith("file:/") || filename.StartsWith("http://") || filename.StartsWith("https://")) {
Stream isp = WebRequest.Create(new Uri(filename)).GetResponse().GetResponseStream();
try {
this.arrayIn = InputStreamToArray(isp);
return;
}
finally {
try {isp.Close();}catch{}
}
}
else {
Stream isp = BaseFont.GetResourceStream(filename);
if (isp == null)
throw new IOException(filename + " not found as file or resource.");
try {
this.arrayIn = InputStreamToArray(isp);
return;
}
finally {
try {isp.Close();}catch{}
}
}
}
else if (forceRead) {
Stream s = null;
try {
s = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
this.arrayIn = InputStreamToArray(s);
}
finally {
try{if (s != null) s.Close();}catch{}
}
return;
}
this.filename = filename;
rf = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
}
public RandomAccessFileOrArray(Uri url) {
Stream isp = WebRequest.Create(url).GetResponse().GetResponseStream();
try {
this.arrayIn = InputStreamToArray(isp);
}
finally {
try {isp.Close();}catch{}
}
}
public RandomAccessFileOrArray(Stream isp) {
this.arrayIn = InputStreamToArray(isp);
}
public static byte[] InputStreamToArray(Stream isp) {
byte[] b = new byte[8192];
MemoryStream outp = new MemoryStream();
while (true) {
int read = isp.Read(b, 0, b.Length);
if (read < 1)
break;
outp.Write(b, 0, read);
}
return outp.ToArray();
}
public RandomAccessFileOrArray(byte[] arrayIn) {
this.arrayIn = arrayIn;
}
public RandomAccessFileOrArray(RandomAccessFileOrArray file) {
filename = file.filename;
arrayIn = file.arrayIn;
startOffset = file.startOffset;
}
public void PushBack(byte b) {
back = b;
isBack = true;
}
public int Read() {
if (isBack) {
isBack = false;
return back & 0xff;
}
if (arrayIn == null)
return rf.ReadByte();
else {
if (arrayInPtr >= arrayIn.Length)
return -1;
return arrayIn[arrayInPtr++] & 0xff;
}
}
public int Read(byte[] b, int off, int len) {
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 rf.Read(b, off, len) + n;
}
else {
if (arrayInPtr >= arrayIn.Length)
return -1;
if (arrayInPtr + len > arrayIn.Length)
len = arrayIn.Length - arrayInPtr;
Array.Copy(arrayIn, arrayInPtr, b, off, len);
arrayInPtr += len;
return len + n;
}
}
public int Read(byte[] b) {
return Read(b, 0, b.Length);
}
public void ReadFully(byte[] b) {
ReadFully(b, 0, b.Length);
}
public void ReadFully(byte[] b, int off, int len) {
if (len == 0)
return;
int n = 0;
do {
int count = Read(b, off + n, len - n);
if (count <= 0)
throw new EndOfStreamException();
n += count;
} while (n < len);
}
public long Skip(long n) {
return SkipBytes((int)n);
}
public int SkipBytes(int n) {
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 = FilePointer;
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() {
if (filename != null && rf == null)
rf = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
Seek(0);
}
protected void InsureOpen() {
if (filename != null && rf == null) {
ReOpen();
}
}
public bool IsOpen() {
return (filename == null || rf != null);
}
public void Close() {
isBack = false;
if (rf != null) {
rf.Close();
rf = null;
}
}
public int Length {
get {
if (arrayIn == null) {
InsureOpen();
return (int)rf.Length - startOffset;
}
else
return arrayIn.Length - startOffset;
}
}
public void Seek(int pos) {
pos += startOffset;
isBack = false;
if (arrayIn == null) {
InsureOpen();
rf.Position = pos;
}
else
arrayInPtr = pos;
}
public void Seek(long pos) {
Seek((int)pos);
}
public int FilePointer {
get {
InsureOpen();
int n = isBack ? 1 : 0;
if (arrayIn == null) {
return (int)rf.Position - n - startOffset;
}
else
return arrayInPtr - n - startOffset;
}
}
public bool ReadBoolean() {
int ch = this.Read();
if (ch < 0)
throw new EndOfStreamException();
return (ch != 0);
}
public byte ReadByte() {
int ch = this.Read();
if (ch < 0)
throw new EndOfStreamException();
return (byte)(ch);
}
public int ReadUnsignedByte() {
int ch = this.Read();
if (ch < 0)
throw new EndOfStreamException();
return ch;
}
public short ReadShort() {
int ch1 = this.Read();
int ch2 = this.Read();
if ((ch1 | ch2) < 0)
throw new EndOfStreamException();
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
* <code>b1</code> and <code>b2</code>, where each of the two values is
* between <code>0</code> and <code>255</code>, inclusive, then the
* result is equal to:
* <blockquote><pre>
* (short)((b2 << 8) | b1)
* </pre></blockquote>
* <p>
* 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 short ReadShortLE() {
int ch1 = this.Read();
int ch2 = this.Read();
if ((ch1 | ch2) < 0)
throw new EndOfStreamException();
return (short)((ch2 << 8) + (ch1 << 0));
}
public int ReadUnsignedShort() {
int ch1 = this.Read();
int ch2 = this.Read();
if ((ch1 | ch2) < 0)
throw new EndOfStreamException();
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
* <code>b1</code> and <code>b2</code>, where
* <code>0 <= b1, b2 <= 255</code>,
* then the result is equal to:
* <blockquote><pre>
* (b2 << 8) | b1
* </pre></blockquote>
* <p>
* 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 int ReadUnsignedShortLE() {
int ch1 = this.Read();
int ch2 = this.Read();
if ((ch1 | ch2) < 0)
throw new EndOfStreamException();
return (ch2 << 8) + (ch1 << 0);
}
public char ReadChar() {
int ch1 = this.Read();
int ch2 = this.Read();
if ((ch1 | ch2) < 0)
throw new EndOfStreamException();
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
* <code>b1</code> and <code>b2</code>, where
* <code>0 <= b1, b2 <= 255</code>,
* then the result is equal to:
* <blockquote><pre>
* (char)((b2 << 8) | b1)
* </pre></blockquote>
* <p>
* 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 char ReadCharLE() {
int ch1 = this.Read();
int ch2 = this.Read();
if ((ch1 | ch2) < 0)
throw new EndOfStreamException();
return (char)((ch2 << 8) + (ch1 << 0));
}
public int ReadInt() {
int ch1 = this.Read();
int ch2 = this.Read();
int ch3 = this.Read();
int ch4 = this.Read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EndOfStreamException();
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 <code>b1</code>,
* <code>b2</code>, <code>b3</code>, and <code>b4</code>, where
* <code>0 <= b1, b2, b3, b4 <= 255</code>,
* then the result is equal to:
* <blockquote><pre>
* (b4 << 24) | (b3 << 16) + (b2 << 8) + b1
* </pre></blockquote>
* <p>
* 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
* <code>int</code>.
* @exception EOFException if this stream reaches the end before reading
* four bytes.
* @exception IOException if an I/O error occurs.
*/
public int ReadIntLE() {
int ch1 = this.Read();
int ch2 = this.Read();
int ch3 = this.Read();
int ch4 = this.Read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EndOfStreamException();
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 <code>b1</code>,
* <code>b2</code>, <code>b3</code>, and <code>b4</code>, where
* <code>0 <= b1, b2, b3, b4 <= 255</code>,
* then the result is equal to:
* <blockquote><pre>
* (b1 << 24) | (b2 << 16) + (b3 << 8) + b4
* </pre></blockquote>
* <p>
* 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
* <code>long</code>.
* @exception EOFException if this stream reaches the end before reading
* four bytes.
* @exception IOException if an I/O error occurs.
*/
public long ReadUnsignedInt() {
long ch1 = this.Read();
long ch2 = this.Read();
long ch3 = this.Read();
long ch4 = this.Read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EndOfStreamException();
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
}
public long ReadUnsignedIntLE() {
long ch1 = this.Read();
long ch2 = this.Read();
long ch3 = this.Read();
long ch4 = this.Read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new EndOfStreamException();
return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + (ch1 << 0));
}
public long ReadLong() {
return ((long)(ReadInt()) << 32) + (ReadInt() & 0xFFFFFFFFL);
}
public long ReadLongLE() {
int i1 = ReadIntLE();
int i2 = ReadIntLE();
return ((long)i2 << 32) + (i1 & 0xFFFFFFFFL);
}
public float ReadFloat() {
int[] a = {ReadInt()};
float[] b = {0};
Buffer.BlockCopy(a, 0, b, 0, 4);
return b[0];
}
public float ReadFloatLE() {
int[] a = {ReadIntLE()};
float[] b = {0};
Buffer.BlockCopy(a, 0, b, 0, 4);
return b[0];
}
public double ReadDouble() {
long[] a = {ReadLong()};
double[] b = {0};
Buffer.BlockCopy(a, 0, b, 0, 8);
return b[0];
}
public double ReadDoubleLE() {
long[] a = {ReadLongLE()};
double[] b = {0};
Buffer.BlockCopy(a, 0, b, 0, 8);
return b[0];
}
public String ReadLine() {
StringBuilder input = new StringBuilder();
int c = -1;
bool eol = false;
while (!eol) {
switch (c = Read()) {
case -1:
case '\n':
eol = true;
break;
case '\r':
eol = true;
int cur = FilePointer;
if ((Read()) != '\n') {
Seek(cur);
}
break;
default:
input.Append((char)c);
break;
}
}
if ((c == -1) && (input.Length == 0)) {
return null;
}
return input.ToString();
}
public int StartOffset {
get {
return startOffset;
}
set {
startOffset = value;
}
}
}
}
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