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Safe data input/output streams (Streams that don't require IOException handling)

This commit is contained in:
Andrea Cavalli 2021-01-23 22:34:28 +01:00
parent 827bb23038
commit 5f0e5419c9
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src/main/java/org/warp/commonutils/stream/SafeDataInputStream.java Normal file
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/*
* Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.warp.commonutils.stream;
import java.io.DataInput;
/**
* A data input stream lets an application read primitive Java data
* types from an underlying input stream in a machine-independent
* way. An application uses a data output stream to write data that
* can later be read by a data input stream.
* <p>
* DataInputStream is not necessarily safe for multithreaded access.
* Thread safety is optional and is the responsibility of users of
* methods in this class.
*
* @author Arthur van Hoff
* @see java.io.DataOutputStream
* @since 1.0
*/
public class SafeDataInputStream extends SafeFilterInputStream implements DataInput {
/**
* Creates a DataInputStream that uses the specified
* underlying InputStream.
*
* @param in the specified input stream
*/
public SafeDataInputStream(SafeInputStream in) {
super(in);
}
/**
* working arrays initialized on demand by readUTF
*/
private byte bytearr[] = new byte[80];
private char chararr[] = new char[80];
/**
* Reads some number of bytes from the contained input stream and
* stores them into the buffer array {@code b}. The number of
* bytes actually read is returned as an integer. This method blocks
* until input data is available, end of file is detected, or an
* exception is thrown.
*
* <p>If {@code b} is null, a {@code NullPointerException} is
* thrown. If the length of {@code b} is zero, then no bytes are
* read and {@code 0} is returned; otherwise, there is an attempt
* to read at least one byte. If no byte is available because the
* stream is at end of file, the value {@code -1} is returned;
* otherwise, at least one byte is read and stored into {@code b}.
*
* <p>The first byte read is stored into element {@code b[0]}, the
* next one into {@code b[1]}, and so on. The number of bytes read
* is, at most, equal to the length of {@code b}. Let {@code k}
* be the number of bytes actually read; these bytes will be stored in
* elements {@code b[0]} through {@code b[k-1]}, leaving
* elements {@code b[k]} through {@code b[b.length-1]}
* unaffected.
*
* <p>The {@code read(b)} method has the same effect as:
* <blockquote><pre>
* read(b, 0, b.length)
* </pre></blockquote>
*
* @param b the buffer into which the data is read.
* @return the total number of bytes read into the buffer, or
* {@code -1} if there is no more data because the end
* of the stream has been reached.
* @see SafeFilterInputStream#in
* @see java.io.InputStream#read(byte[], int, int)
*/
public final int read(byte b[]) {
return in.read(b, 0, b.length);
}
/**
* Reads up to {@code len} bytes of data from the contained
* input stream into an array of bytes. An attempt is made to read
* as many as {@code len} bytes, but a smaller number may be read,
* possibly zero. The number of bytes actually read is returned as an
* integer.
*
* <p> This method blocks until input data is available, end of file is
* detected, or an exception is thrown.
*
* <p> If {@code len} is zero, then no bytes are read and
* {@code 0} is returned; otherwise, there is an attempt to read at
* least one byte. If no byte is available because the stream is at end of
* file, the value {@code -1} is returned; otherwise, at least one
* byte is read and stored into {@code b}.
*
* <p> The first byte read is stored into element {@code b[off]}, the
* next one into {@code b[off+1]}, and so on. The number of bytes read
* is, at most, equal to {@code len}. Let <i>k</i> be the number of
* bytes actually read; these bytes will be stored in elements
* {@code b[off]} through {@code b[off+}<i>k</i>{@code -1]},
* leaving elements {@code b[off+}<i>k</i>{@code ]} through
* {@code b[off+len-1]} unaffected.
*
* <p> In every case, elements {@code b[0]} through
* {@code b[off]} and elements {@code b[off+len]} through
* {@code b[b.length-1]} are unaffected.
*
* @param b the buffer into which the data is read.
* @param off the start offset in the destination array {@code b}
* @param len the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or
* {@code -1} if there is no more data because the end
* of the stream has been reached.
* @throws NullPointerException If {@code b} is {@code null}.
* @throws IndexOutOfBoundsException If {@code off} is negative,
* {@code len} is negative, or {@code len} is greater than
* {@code b.length - off}
* @see SafeFilterInputStream#in
* @see java.io.InputStream#read(byte[], int, int)
*/
public final int read(byte b[], int off, int len) {
return in.read(b, off, len);
}
/**
* See the general contract of the {@code readFully}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @param b the buffer into which the data is read.
* @throws NullPointerException if {@code b} is {@code null}.
* @see SafeFilterInputStream#in
*/
public final void readFully(byte b[]) {
readFully(b, 0, b.length);
}
/**
* See the general contract of the {@code readFully}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @param b the buffer into which the data is read.
* @param off the start offset in the data array {@code b}.
* @param len the number of bytes to read.
* @throws NullPointerException if {@code b} is {@code null}.
* @throws IndexOutOfBoundsException if {@code off} is negative,
* {@code len} is negative, or {@code len} is greater than
* {@code b.length - off}.
* @see SafeFilterInputStream#in
*/
public final void readFully(byte b[], int off, int len) {
if (len < 0)
throw new IndexOutOfBoundsException();
int n = 0;
while (n < len) {
int count = in.read(b, off + n, len - n);
if (count < 0)
throw new IndexOutOfBoundsException();
n += count;
}
}
/**
* See the general contract of the {@code skipBytes}
* method of {@code DataInput}.
* <p>
* Bytes for this operation are read from the contained
* input stream.
*
* @param n the number of bytes to be skipped.
* @return the actual number of bytes skipped.
*/
public final int skipBytes(int n) {
int total = 0;
int cur = 0;
while ((total<n) && ((cur = (int) in.skip(n-total)) > 0)) {
total += cur;
}
return total;
}
/**
* See the general contract of the {@code readBoolean}
* method of {@code DataInput}.
* <p>
* Bytes for this operation are read from the contained
* input stream.
*
* @return the {@code boolean} value read.
* @see SafeFilterInputStream#in
*/
public final boolean readBoolean() {
int ch = in.read();
if (ch < 0)
throw new IndexOutOfBoundsException();
return (ch != 0);
}
/**
* See the general contract of the {@code readByte}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next byte of this input stream as a signed 8-bit
* {@code byte}.
* @see SafeFilterInputStream#in
*/
public final byte readByte() {
int ch = in.read();
if (ch < 0)
throw new IndexOutOfBoundsException();
return (byte)(ch);
}
/**
* See the general contract of the {@code readUnsignedByte}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next byte of this input stream, interpreted as an
* unsigned 8-bit number.
* @see SafeFilterInputStream#in
*/
public final int readUnsignedByte() {
int ch = in.read();
if (ch < 0)
throw new IndexOutOfBoundsException();
return ch;
}
/**
* See the general contract of the {@code readShort}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next two bytes of this input stream, interpreted as a
* signed 16-bit number.
* @see SafeFilterInputStream#in
*/
public final short readShort() {
int ch1 = in.read();
int ch2 = in.read();
if ((ch1 | ch2) < 0)
throw new IndexOutOfBoundsException();
return (short)((ch1 << 8) + (ch2 << 0));
}
/**
* See the general contract of the {@code readUnsignedShort}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next two bytes of this input stream, interpreted as an
* unsigned 16-bit integer.
* @see SafeFilterInputStream#in
*/
public final int readUnsignedShort() {
int ch1 = in.read();
int ch2 = in.read();
if ((ch1 | ch2) < 0)
throw new IndexOutOfBoundsException();
return (ch1 << 8) + (ch2 << 0);
}
/**
* See the general contract of the {@code readChar}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next two bytes of this input stream, interpreted as a
* {@code char}.
* @see SafeFilterInputStream#in
*/
public final char readChar() {
int ch1 = in.read();
int ch2 = in.read();
if ((ch1 | ch2) < 0)
throw new IndexOutOfBoundsException();
return (char)((ch1 << 8) + (ch2 << 0));
}
/**
* See the general contract of the {@code readInt}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next four bytes of this input stream, interpreted as an
* {@code int}.
* @see SafeFilterInputStream#in
*/
public final int readInt() {
int ch1 = in.read();
int ch2 = in.read();
int ch3 = in.read();
int ch4 = in.read();
if ((ch1 | ch2 | ch3 | ch4) < 0)
throw new IndexOutOfBoundsException();
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
}
private byte readBuffer[] = new byte[8];
/**
* See the general contract of the {@code readLong}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next eight bytes of this input stream, interpreted as a
* {@code long}.
* @see SafeFilterInputStream#in
*/
public final long readLong() {
readFully(readBuffer, 0, 8);
return (((long)readBuffer[0] << 56) +
((long)(readBuffer[1] & 255) << 48) +
((long)(readBuffer[2] & 255) << 40) +
((long)(readBuffer[3] & 255) << 32) +
((long)(readBuffer[4] & 255) << 24) +
((readBuffer[5] & 255) << 16) +
((readBuffer[6] & 255) << 8) +
((readBuffer[7] & 255) << 0));
}
/**
* See the general contract of the {@code readFloat}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next four bytes of this input stream, interpreted as a
* {@code float}.
* @see SafeDataInputStream#readInt()
* @see java.lang.Float#intBitsToFloat(int)
*/
public final float readFloat() {
return Float.intBitsToFloat(readInt());
}
/**
* See the general contract of the {@code readDouble}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next eight bytes of this input stream, interpreted as a
* {@code double}.
* @see SafeDataInputStream#readLong()
* @see java.lang.Double#longBitsToDouble(long)
*/
public final double readDouble() {
return Double.longBitsToDouble(readLong());
}
private char lineBuffer[];
/**
* See the general contract of the {@code readLine}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @deprecated This method does not properly convert bytes to characters.
* As of JDK&nbsp;1.1, the preferred way to read lines of text is via the
* {@code BufferedReader.readLine()} method. Programs that use the
* {@code DataInputStream} class to read lines can be converted to use
* the {@code BufferedReader} class by replacing code of the form:
* <blockquote><pre>
* DataInputStream d =&nbsp;new&nbsp;DataInputStream(in);
* </pre></blockquote>
* with:
* <blockquote><pre>
* BufferedReader d
* =&nbsp;new&nbsp;BufferedReader(new&nbsp;InputStreamReader(in));
* </pre></blockquote>
*
* @return the next line of text from this input stream.
* @see java.io.BufferedReader#readLine()
* @see SafeFilterInputStream#in
*/
@Deprecated
public final String readLine() {
char buf[] = lineBuffer;
if (buf == null) {
buf = lineBuffer = new char[128];
}
int room = buf.length;
int offset = 0;
int c;
loop: while (true) {
switch (c = in.read()) {
case -1:
case '\n':
break loop;
case '\r':
int c2 = in.read();
if ((c2 != '\n') && (c2 != -1)) {
if (!(in instanceof SafePushbackInputStream)) {
this.in = new SafePushbackInputStream(in);
}
((SafePushbackInputStream)in).unread(c2);
}
break loop;
default:
if (--room < 0) {
buf = new char[offset + 128];
room = buf.length - offset - 1;
System.arraycopy(lineBuffer, 0, buf, 0, offset);
lineBuffer = buf;
}
buf[offset++] = (char) c;
break;
}
}
if ((c == -1) && (offset == 0)) {
return null;
}
return String.copyValueOf(buf, 0, offset);
}
/**
* See the general contract of the {@code readUTF}
* method of {@code DataInput}.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return a Unicode string.
* @see SafeDataInputStream#readUTF(SafeDataInputStream)
*/
public final String readUTF() {
return readUTF(this);
}
/**
* Reads from the
* stream {@code in} a representation
* of a Unicode character string encoded in
* <a href="DataInput.html#modified-utf-8">modified UTF-8</a> format;
* this string of characters is then returned as a {@code String}.
* The details of the modified UTF-8 representation
* are exactly the same as for the {@code readUTF}
* method of {@code DataInput}.
*
* @param in a data input stream.
* @return a Unicode string.
* @see SafeDataInputStream#readUnsignedShort()
*/
public static final String readUTF(SafeDataInputStream in) {
int utflen = in.readUnsignedShort();
byte[] bytearr = null;
char[] chararr = null;
SafeDataInputStream dis = in;
if (dis.bytearr.length < utflen){
dis.bytearr = new byte[utflen*2];
dis.chararr = new char[utflen*2];
}
chararr = dis.chararr;
bytearr = dis.bytearr;
int c, char2, char3;
int count = 0;
int chararr_count=0;
in.readFully(bytearr, 0, utflen);
while (count < utflen) {
c = (int) bytearr[count] & 0xff;
if (c > 127) break;
count++;
chararr[chararr_count++]=(char)c;
}
while (count < utflen) {
c = (int) bytearr[count] & 0xff;
switch (c >> 4) {
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
/* 0xxxxxxx*/
count++;
chararr[chararr_count++]=(char)c;
break;
case 12: case 13:
/* 110x xxxx 10xx xxxx*/
count += 2;
if (count > utflen)
throw new IllegalArgumentException(
"malformed input: partial character at end");
char2 = bytearr[count-1];
if ((char2 & 0xC0) != 0x80)
throw new IllegalArgumentException(
"malformed input around byte " + count);
chararr[chararr_count++]=(char)(((c & 0x1F) << 6) |
(char2 & 0x3F));
break;
case 14:
/* 1110 xxxx 10xx xxxx 10xx xxxx */
count += 3;
if (count > utflen)
throw new IllegalArgumentException(
"malformed input: partial character at end");
char2 = bytearr[count-2];
char3 = bytearr[count-1];
if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
throw new IllegalArgumentException(
"malformed input around byte " + (count-1));
chararr[chararr_count++]=(char)(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
default:
/* 10xx xxxx, 1111 xxxx */
throw new IllegalArgumentException(
"malformed input around byte " + count);
}
}
// The number of chars produced may be less than utflen
return new String(chararr, 0, chararr_count);
}
}

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src/main/java/org/warp/commonutils/stream/SafeDataOutput.java Normal file
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/*
* Copyright (c) 1995, 2020, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.warp.commonutils.stream;
/**
* The {@code SafeDataOutput} interface provides
* for converting data from any of the Java
* primitive types to a series of bytes and
* writing these bytes to a binary stream.
* There is also a facility for converting
* a {@code String} into
* <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
* format and writing the resulting series
* of bytes.
* <p>
* For all the methods in this interface that
* write bytes, it is generally true that if
* a byte cannot be written for any reason,
* an {@code IOException} is thrown.
*
* @author Frank Yellin
* @see java.io.DataInput
* @see java.io.DataOutputStream
* @since 1.0
*/
public interface SafeDataOutput {
/**
* Writes to the output stream the eight
* low-order bits of the argument {@code b}.
* The 24 high-order bits of {@code b}
* are ignored.
*
* @param b the byte to be written.
*/
void write(int b);
/**
* Writes to the output stream all the bytes in array {@code b}.
* If {@code b} is {@code null},
* a {@code NullPointerException} is thrown.
* If {@code b.length} is zero, then
* no bytes are written. Otherwise, the byte
* {@code b[0]} is written first, then
* {@code b[1]}, and so on; the last byte
* written is {@code b[b.length-1]}.
*
* @param b the data.
*/
void write(byte b[]);
/**
* Writes {@code len} bytes from array
* {@code b}, in order, to
* the output stream. If {@code b}
* is {@code null}, a {@code NullPointerException}
* is thrown. If {@code off} is negative,
* or {@code len} is negative, or {@code off+len}
* is greater than the length of the array
* {@code b}, then an {@code IndexOutOfBoundsException}
* is thrown. If {@code len} is zero,
* then no bytes are written. Otherwise, the
* byte {@code b[off]} is written first,
* then {@code b[off+1]}, and so on; the
* last byte written is {@code b[off+len-1]}.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
*/
void write(byte b[], int off, int len);
/**
* Writes a {@code boolean} value to this output stream.
* If the argument {@code v}
* is {@code true}, the value {@code (byte)1}
* is written; if {@code v} is {@code false},
* the value {@code (byte)0} is written.
* The byte written by this method may
* be read by the {@code readBoolean}
* method of interface {@code DataInput},
* which will then return a {@code boolean}
* equal to {@code v}.
*
* @param v the boolean to be written.
*/
void writeBoolean(boolean v);
/**
* Writes to the output stream the eight low-order
* bits of the argument {@code v}.
* The 24 high-order bits of {@code v}
* are ignored. (This means that {@code writeByte}
* does exactly the same thing as {@code write}
* for an integer argument.) The byte written
* by this method may be read by the {@code readByte}
* method of interface {@code DataInput},
* which will then return a {@code byte}
* equal to {@code (byte)v}.
*
* @param v the byte value to be written.
*/
void writeByte(int v);
/**
* Writes two bytes to the output
* stream to represent the value of the argument.
* The byte values to be written, in the order
* shown, are:
* <pre>{@code
* (byte)(0xff & (v >> 8))
* (byte)(0xff & v)
* }</pre> <p>
* The bytes written by this method may be
* read by the {@code readShort} method
* of interface {@code DataInput}, which
* will then return a {@code short} equal
* to {@code (short)v}.
*
* @param v the {@code short} value to be written.
*/
void writeShort(int v);
/**
* Writes a {@code char} value, which
* is comprised of two bytes, to the
* output stream.
* The byte values to be written, in the order
* shown, are:
* <pre>{@code
* (byte)(0xff & (v >> 8))
* (byte)(0xff & v)
* }</pre><p>
* The bytes written by this method may be
* read by the {@code readChar} method
* of interface {@code DataInput}, which
* will then return a {@code char} equal
* to {@code (char)v}.
*
* @param v the {@code char} value to be written.
*/
void writeChar(int v);
/**
* Writes an {@code int} value, which is
* comprised of four bytes, to the output stream.
* The byte values to be written, in the order
* shown, are:
* <pre>{@code
* (byte)(0xff & (v >> 24))
* (byte)(0xff & (v >> 16))
* (byte)(0xff & (v >> 8))
* (byte)(0xff & v)
* }</pre><p>
* The bytes written by this method may be read
* by the {@code readInt} method of interface
* {@code DataInput}, which will then
* return an {@code int} equal to {@code v}.
*
* @param v the {@code int} value to be written.
*/
void writeInt(int v);
/**
* Writes a {@code long} value, which is
* comprised of eight bytes, to the output stream.
* The byte values to be written, in the order
* shown, are:
* <pre>{@code
* (byte)(0xff & (v >> 56))
* (byte)(0xff & (v >> 48))
* (byte)(0xff & (v >> 40))
* (byte)(0xff & (v >> 32))
* (byte)(0xff & (v >> 24))
* (byte)(0xff & (v >> 16))
* (byte)(0xff & (v >> 8))
* (byte)(0xff & v)
* }</pre><p>
* The bytes written by this method may be
* read by the {@code readLong} method
* of interface {@code DataInput}, which
* will then return a {@code long} equal
* to {@code v}.
*
* @param v the {@code long} value to be written.
*/
void writeLong(long v);
/**
* Writes a {@code float} value,
* which is comprised of four bytes, to the output stream.
* It does this as if it first converts this
* {@code float} value to an {@code int}
* in exactly the manner of the {@code Float.floatToIntBits}
* method and then writes the {@code int}
* value in exactly the manner of the {@code writeInt}
* method. The bytes written by this method
* may be read by the {@code readFloat}
* method of interface {@code DataInput},
* which will then return a {@code float}
* equal to {@code v}.
*
* @param v the {@code float} value to be written.
*/
void writeFloat(float v);
/**
* Writes a {@code double} value,
* which is comprised of eight bytes, to the output stream.
* It does this as if it first converts this
* {@code double} value to a {@code long}
* in exactly the manner of the {@code Double.doubleToLongBits}
* method and then writes the {@code long}
* value in exactly the manner of the {@code writeLong}
* method. The bytes written by this method
* may be read by the {@code readDouble}
* method of interface {@code DataInput},
* which will then return a {@code double}
* equal to {@code v}.
*
* @param v the {@code double} value to be written.
*/
void writeDouble(double v);
/**
* Writes a string to the output stream.
* For every character in the string
* {@code s}, taken in order, one byte
* is written to the output stream. If
* {@code s} is {@code null}, a {@code NullPointerException}
* is thrown.<p> If {@code s.length}
* is zero, then no bytes are written. Otherwise,
* the character {@code s[0]} is written
* first, then {@code s[1]}, and so on;
* the last character written is {@code s[s.length-1]}.
* For each character, one byte is written,
* the low-order byte, in exactly the manner
* of the {@code writeByte} method . The
* high-order eight bits of each character
* in the string are ignored.
*
* @param s the string of bytes to be written.
*/
void writeBytes(String s);
/**
* Writes every character in the string {@code s},
* to the output stream, in order,
* two bytes per character. If {@code s}
* is {@code null}, a {@code NullPointerException}
* is thrown. If {@code s.length}
* is zero, then no characters are written.
* Otherwise, the character {@code s[0]}
* is written first, then {@code s[1]},
* and so on; the last character written is
* {@code s[s.length-1]}. For each character,
* two bytes are actually written, high-order
* byte first, in exactly the manner of the
* {@code writeChar} method.
*
* @param s the string value to be written.
*/
void writeChars(String s);
/**
* Writes two bytes of length information
* to the output stream, followed
* by the
* <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
* representation
* of every character in the string {@code s}.
* If {@code s} is {@code null},
* a {@code NullPointerException} is thrown.
* Each character in the string {@code s}
* is converted to a group of one, two, or
* three bytes, depending on the value of the
* character.<p>
* If a character {@code c}
* is in the range <code>&#92;u0001</code> through
* <code>&#92;u007f</code>, it is represented
* by one byte:
* <pre>(byte)c </pre> <p>
* If a character {@code c} is <code>&#92;u0000</code>
* or is in the range <code>&#92;u0080</code>
* through <code>&#92;u07ff</code>, then it is
* represented by two bytes, to be written
* in the order shown: <pre>{@code
* (byte)(0xc0 | (0x1f & (c >> 6)))
* (byte)(0x80 | (0x3f & c))
* }</pre> <p> If a character
* {@code c} is in the range <code>&#92;u0800</code>
* through {@code uffff}, then it is
* represented by three bytes, to be written
* in the order shown: <pre>{@code
* (byte)(0xe0 | (0x0f & (c >> 12)))
* (byte)(0x80 | (0x3f & (c >> 6)))
* (byte)(0x80 | (0x3f & c))
* }</pre> <p> First,
* the total number of bytes needed to represent
* all the characters of {@code s} is
* calculated. If this number is larger than
* {@code 65535}, then a {@code UTFDataFormatException}
* is thrown. Otherwise, this length is written
* to the output stream in exactly the manner
* of the {@code writeShort} method;
* after this, the one-, two-, or three-byte
* representation of each character in the
* string {@code s} is written.<p> The
* bytes written by this method may be read
* by the {@code readUTF} method of interface
* {@code DataInput}, which will then
* return a {@code String} equal to {@code s}.
*
* @param s the string value to be written.
*/
void writeUTF(String s);
}

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/*
* Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.warp.commonutils.stream;
import java.io.DataOutputStream;
/**
* A data output stream lets an application write primitive Java data
* types to an output stream in a portable way. An application can
* then use a data input stream to read the data back in.
*
* @author unascribed
* @see java.io.DataInputStream
* @since 1.0
*/
public class SafeDataOutputStream extends SafeFilterOutputStream implements SafeDataOutput {
/**
* The number of bytes written to the data output stream so far.
* If this counter overflows, it will be wrapped to Integer.MAX_VALUE.
*/
protected int written;
/**
* bytearr is initialized on demand by writeUTF
*/
private byte[] bytearr = null;
/**
* Creates a new data output stream to write data to the specified
* underlying output stream. The counter {@code written} is
* set to zero.
*
* @param out the underlying output stream, to be saved for later
* use.
* @see SafeFilterOutputStream#out
*/
public SafeDataOutputStream(SafeOutputStream out) {
super(out);
}
/**
* Increases the written counter by the specified value
* until it reaches Integer.MAX_VALUE.
*/
private void incCount(int value) {
int temp = written + value;
if (temp < 0) {
temp = Integer.MAX_VALUE;
}
written = temp;
}
/**
* Writes the specified byte (the low eight bits of the argument
* {@code b}) to the underlying output stream. If no exception
* is thrown, the counter {@code written} is incremented by
* {@code 1}.
* <p>
* Implements the {@code write} method of {@code OutputStream}.
*
* @param b the {@code byte} to be written.
* @see SafeFilterOutputStream#out
*/
public synchronized void write(int b) {
out.write(b);
incCount(1);
}
/**
* Writes {@code len} bytes from the specified byte array
* starting at offset {@code off} to the underlying output stream.
* If no exception is thrown, the counter {@code written} is
* incremented by {@code len}.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
* @see SafeFilterOutputStream#out
*/
public synchronized void write(byte b[], int off, int len)
{
out.write(b, off, len);
incCount(len);
}
/**
* Flushes this data output stream. This forces any buffered output
* bytes to be written out to the stream.
* <p>
* The {@code flush} method of {@code SafeDataOutputStream}
* calls the {@code flush} method of its underlying output stream.
*
* @see SafeFilterOutputStream#out
* @see java.io.OutputStream#flush()
*/
public void flush() {
out.flush();
}
/**
* Writes a {@code boolean} to the underlying output stream as
* a 1-byte value. The value {@code true} is written out as the
* value {@code (byte)1}; the value {@code false} is
* written out as the value {@code (byte)0}. If no exception is
* thrown, the counter {@code written} is incremented by
* {@code 1}.
*
* @param v a {@code boolean} value to be written.
* @see SafeFilterOutputStream#out
*/
public final void writeBoolean(boolean v) {
out.write(v ? 1 : 0);
incCount(1);
}
/**
* Writes out a {@code byte} to the underlying output stream as
* a 1-byte value. If no exception is thrown, the counter
* {@code written} is incremented by {@code 1}.
*
* @param v a {@code byte} value to be written.
* @see SafeFilterOutputStream#out
*/
public final void writeByte(int v) {
out.write(v);
incCount(1);
}
/**
* Writes a {@code short} to the underlying output stream as two
* bytes, high byte first. If no exception is thrown, the counter
* {@code written} is incremented by {@code 2}.
*
* @param v a {@code short} to be written.
* @see SafeFilterOutputStream#out
*/
public final void writeShort(int v) {
out.write((v >>> 8) & 0xFF);
out.write((v >>> 0) & 0xFF);
incCount(2);
}
/**
* Writes a {@code char} to the underlying output stream as a
* 2-byte value, high byte first. If no exception is thrown, the
* counter {@code written} is incremented by {@code 2}.
*
* @param v a {@code char} value to be written.
* @see SafeFilterOutputStream#out
*/
public final void writeChar(int v) {
out.write((v >>> 8) & 0xFF);
out.write((v >>> 0) & 0xFF);
incCount(2);
}
/**
* Writes an {@code int} to the underlying output stream as four
* bytes, high byte first. If no exception is thrown, the counter
* {@code written} is incremented by {@code 4}.
*
* @param v an {@code int} to be written.
* @see SafeFilterOutputStream#out
*/
public final void writeInt(int v) {
out.write((v >>> 24) & 0xFF);
out.write((v >>> 16) & 0xFF);
out.write((v >>> 8) & 0xFF);
out.write((v >>> 0) & 0xFF);
incCount(4);
}
private byte writeBuffer[] = new byte[8];
/**
* Writes a {@code long} to the underlying output stream as eight
* bytes, high byte first. In no exception is thrown, the counter
* {@code written} is incremented by {@code 8}.
*
* @param v a {@code long} to be written.
* @see SafeFilterOutputStream#out
*/
public final void writeLong(long v) {
writeBuffer[0] = (byte)(v >>> 56);
writeBuffer[1] = (byte)(v >>> 48);
writeBuffer[2] = (byte)(v >>> 40);
writeBuffer[3] = (byte)(v >>> 32);
writeBuffer[4] = (byte)(v >>> 24);
writeBuffer[5] = (byte)(v >>> 16);
writeBuffer[6] = (byte)(v >>> 8);
writeBuffer[7] = (byte)(v >>> 0);
out.write(writeBuffer, 0, 8);
incCount(8);
}
/**
* Converts the float argument to an {@code int} using the
* {@code floatToIntBits} method in class {@code Float},
* and then writes that {@code int} value to the underlying
* output stream as a 4-byte quantity, high byte first. If no
* exception is thrown, the counter {@code written} is
* incremented by {@code 4}.
*
* @param v a {@code float} value to be written.
* @see SafeFilterOutputStream#out
* @see java.lang.Float#floatToIntBits(float)
*/
public final void writeFloat(float v) {
writeInt(Float.floatToIntBits(v));
}
/**
* Converts the double argument to a {@code long} using the
* {@code doubleToLongBits} method in class {@code Double},
* and then writes that {@code long} value to the underlying
* output stream as an 8-byte quantity, high byte first. If no
* exception is thrown, the counter {@code written} is
* incremented by {@code 8}.
*
* @param v a {@code double} value to be written.
* @see SafeFilterOutputStream#out
* @see java.lang.Double#doubleToLongBits(double)
*/
public final void writeDouble(double v) {
writeLong(Double.doubleToLongBits(v));
}
/**
* Writes out the string to the underlying output stream as a
* sequence of bytes. Each character in the string is written out, in
* sequence, by discarding its high eight bits. If no exception is
* thrown, the counter {@code written} is incremented by the
* length of {@code s}.
*
* @param s a string of bytes to be written.
* @see SafeFilterOutputStream#out
*/
public final void writeBytes(String s) {
int len = s.length();
for (int i = 0 ; i < len ; i++) {
out.write((byte)s.charAt(i));
}
incCount(len);
}
/**
* Writes a string to the underlying output stream as a sequence of
* characters. Each character is written to the data output stream as
* if by the {@code writeChar} method. If no exception is
* thrown, the counter {@code written} is incremented by twice
* the length of {@code s}.
*
* @param s a {@code String} value to be written.
* @see SafeDataOutputStream#writeChar(int)
* @see SafeFilterOutputStream#out
*/
public final void writeChars(String s) {
int len = s.length();
for (int i = 0 ; i < len ; i++) {
int v = s.charAt(i);
out.write((v >>> 8) & 0xFF);
out.write((v >>> 0) & 0xFF);
}
incCount(len * 2);
}
/**
* Writes a string to the underlying output stream using
* <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
* encoding in a machine-independent manner.
* <p>
* First, two bytes are written to the output stream as if by the
* {@code writeShort} method giving the number of bytes to
* follow. This value is the number of bytes actually written out,
* not the length of the string. Following the length, each character
* of the string is output, in sequence, using the modified UTF-8 encoding
* for the character. If no exception is thrown, the counter
* {@code written} is incremented by the total number of
* bytes written to the output stream. This will be at least two
* plus the length of {@code str}, and at most two plus
* thrice the length of {@code str}.
*
* @param str a string to be written.
* @see #writeChars(String)
*/
public final void writeUTF(String str) {
writeUTF(str, this);
}
/**
* Writes a string to the specified DataOutput using
* <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
* encoding in a machine-independent manner.
* <p>
* First, two bytes are written to out as if by the {@code writeShort}
* method giving the number of bytes to follow. This value is the number of
* bytes actually written out, not the length of the string. Following the
* length, each character of the string is output, in sequence, using the
* modified UTF-8 encoding for the character. If no exception is thrown, the
* counter {@code written} is incremented by the total number of
* bytes written to the output stream. This will be at least two
* plus the length of {@code str}, and at most two plus
* thrice the length of {@code str}.
*
* @param str a string to be written.
* @param out destination to write to
* @return The number of bytes written out.
*/
static int writeUTF(String str, SafeDataOutput out) {
final int strlen = str.length();
int utflen = strlen; // optimized for ASCII
for (int i = 0; i < strlen; i++) {
int c = str.charAt(i);
if (c >= 0x80 || c == 0)
utflen += (c >= 0x800) ? 2 : 1;
}
if (utflen > 65535 || /* overflow */ utflen < strlen)
throw new IllegalArgumentException(tooLongMsg(str, utflen));
final byte[] bytearr;
if (out instanceof SafeDataOutputStream) {
SafeDataOutputStream dos = (SafeDataOutputStream)out;
if (dos.bytearr == null || (dos.bytearr.length < (utflen + 2)))
dos.bytearr = new byte[(utflen*2) + 2];
bytearr = dos.bytearr;
} else {
bytearr = new byte[utflen + 2];
}
int count = 0;
bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);
bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);
int i = 0;
for (i = 0; i < strlen; i++) { // optimized for initial run of ASCII
int c = str.charAt(i);
if (c >= 0x80 || c == 0) break;
bytearr[count++] = (byte) c;
}
for (; i < strlen; i++) {
int c = str.charAt(i);
if (c < 0x80 && c != 0) {
bytearr[count++] = (byte) c;
} else if (c >= 0x800) {
bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
bytearr[count++] = (byte) (0x80 | ((c >> 6) & 0x3F));
bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
} else {
bytearr[count++] = (byte) (0xC0 | ((c >> 6) & 0x1F));
bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
}
}
out.write(bytearr, 0, utflen + 2);
return utflen + 2;
}
private static String tooLongMsg(String s, int bits32) {
int slen = s.length();
String head = s.substring(0, 8);
String tail = s.substring(slen - 8, slen);
// handle int overflow with max 3x expansion
long actualLength = (long)slen + Integer.toUnsignedLong(bits32 - slen);
return "encoded string (" + head + "..." + tail + ") too long: "
+ actualLength + " bytes";
}
/**
* Returns the current value of the counter {@code written},
* the number of bytes written to this data output stream so far.
* If the counter overflows, it will be wrapped to Integer.MAX_VALUE.
*
* @return the value of the {@code written} field.
* @see SafeDataOutputStream#written
*/
public final int size() {
return written;
}
public DataOutputStream asDataOutputStream() {
return new DataOutputStream(this.out);
}
}

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package org.warp.commonutils.stream;
/**
* A {@code FilterInputStream} contains
* some other input stream, which it uses as
* its basic source of data, possibly transforming
* the data along the way or providing additional
* functionality. The class {@code FilterInputStream}
* itself simply overrides all methods of
* {@code InputStream} with versions that
* pass all requests to the contained input
* stream. Subclasses of {@code FilterInputStream}
* may further override some of these methods
* and may also provide additional methods
* and fields.
*
* @author Jonathan Payne
* @since 1.0
*/
public class SafeFilterInputStream extends SafeInputStream {
/**
* The input stream to be filtered.
*/
protected volatile SafeInputStream in;
/**
* Creates a {@code FilterInputStream}
* by assigning the argument {@code in}
* to the field {@code this.in} so as
* to remember it for later use.
*
* @param in the underlying input stream, or {@code null} if
* this instance is to be created without an underlying stream.
*/
protected SafeFilterInputStream(SafeInputStream in) {
this.in = in;
}
/**
* Reads the next byte of data from this input stream. The value
* byte is returned as an {@code int} in the range
* {@code 0} to {@code 255}. If no byte is available
* because the end of the stream has been reached, the value
* {@code -1} is returned. This method blocks until input data
* is available, the end of the stream is detected, or an exception
* is thrown.
* <p>
* This method
* simply performs {@code in.read()} and returns the result.
*
* @return the next byte of data, or {@code -1} if the end of the
* stream is reached.
* @see SafeFilterInputStream#in
*/
public int read() {
return in.read();
}
/**
* Reads up to {@code b.length} bytes of data from this
* input stream into an array of bytes. This method blocks until some
* input is available.
* <p>
* This method simply performs the call
* {@code read(b, 0, b.length)} and returns
* the result. It is important that it does
* <i>not</i> do {@code in.read(b)} instead;
* certain subclasses of {@code FilterInputStream}
* depend on the implementation strategy actually
* used.
*
* @param b the buffer into which the data is read.
* @return the total number of bytes read into the buffer, or
* {@code -1} if there is no more data because the end of
* the stream has been reached.
* @see SafeFilterInputStream#read(byte[], int, int)
*/
public int read(byte b[]) {
return read(b, 0, b.length);
}
/**
* Reads up to {@code len} bytes of data from this input stream
* into an array of bytes. If {@code len} is not zero, the method
* blocks until some input is available; otherwise, no
* bytes are read and {@code 0} is returned.
* <p>
* This method simply performs {@code in.read(b, off, len)}
* and returns the result.
*
* @param b the buffer into which the data is read.
* @param off the start offset in the destination array {@code b}
* @param len the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or
* {@code -1} if there is no more data because the end of
* the stream has been reached.
* @throws NullPointerException If {@code b} is {@code null}.
* @throws IndexOutOfBoundsException If {@code off} is negative,
* {@code len} is negative, or {@code len} is greater than
* {@code b.length - off}
* @see SafeFilterInputStream#in
*/
public int read(byte b[], int off, int len) {
return in.read(b, off, len);
}
/**
* Skips over and discards {@code n} bytes of data from the
* input stream. The {@code skip} method may, for a variety of
* reasons, end up skipping over some smaller number of bytes,
* possibly {@code 0}. The actual number of bytes skipped is
* returned.
* <p>
* This method simply performs {@code in.skip(n)}.
*
* @param n the number of bytes to be skipped.
* @return the actual number of bytes skipped.
*/
public long skip(long n) {
return in.skip(n);
}
/**
* Returns an estimate of the number of bytes that can be read (or
* skipped over) from this input stream without blocking by the next
* caller of a method for this input stream. The next caller might be
* the same thread or another thread. A single read or skip of this
* many bytes will not block, but may read or skip fewer bytes.
* <p>
* This method returns the result of {@link #in in}.available().
*
* @return an estimate of the number of bytes that can be read (or skipped
* over) from this input stream without blocking.
*/
public int available() {
return in.available();
}
/**
* Closes this input stream and releases any system resources
* associated with the stream.
* This
* method simply performs {@code in.close()}.
*
* @see SafeFilterInputStream#in
*/
public void close() {
in.close();
}
/**
* Marks the current position in this input stream. A subsequent
* call to the {@code reset} method repositions this stream at
* the last marked position so that subsequent reads re-read the same bytes.
* <p>
* The {@code readlimit} argument tells this input stream to
* allow that many bytes to be read before the mark position gets
* invalidated.
* <p>
* This method simply performs {@code in.mark(readlimit)}.
*
* @param readlimit the maximum limit of bytes that can be read before
* the mark position becomes invalid.
* @see SafeFilterInputStream#in
* @see SafeFilterInputStream#reset()
*/
public synchronized void mark(int readlimit) {
in.mark(readlimit);
}
/**
* Repositions this stream to the position at the time the
* {@code mark} method was last called on this input stream.
* <p>
* This method
* simply performs {@code in.reset()}.
* <p>
* Stream marks are intended to be used in
* situations where you need to read ahead a little to see what's in
* the stream. Often this is most easily done by invoking some
* general parser. If the stream is of the type handled by the
* parse, it just chugs along happily. If the stream is not of
* that type, the parser should toss an exception when it fails.
* If this happens within readlimit bytes, it allows the outer
* code to reset the stream and try another parser.
*
* @see SafeFilterInputStream#in
* @see SafeFilterInputStream#mark(int)
*/
public synchronized void reset() {
in.reset();
}
/**
* Tests if this input stream supports the {@code mark}
* and {@code reset} methods.
* This method
* simply performs {@code in.markSupported()}.
*
* @return {@code true} if this stream type supports the
* {@code mark} and {@code reset} method;
* {@code false} otherwise.
* @see SafeFilterInputStream#in
* @see java.io.InputStream#mark(int)
* @see java.io.InputStream#reset()
*/
public boolean markSupported() {
return in.markSupported();
}
}

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package org.warp.commonutils.stream;
/**
* This class is the superclass of all classes that filter output
* streams. These streams sit on top of an already existing output
* stream (the <i>underlying</i> output stream) which it uses as its
* basic sink of data, but possibly transforming the data along the
* way or providing additional functionality.
* <p>
* The class {@code FilterOutputStream} itself simply overrides
* all methods of {@code SafeOutputStream} with versions that pass
* all requests to the underlying output stream. Subclasses of
* {@code FilterOutputStream} may further override some of these
* methods as well as provide additional methods and fields.
*
* @author Jonathan Payne
* @since 1.0
*/
public class SafeFilterOutputStream extends SafeOutputStream {
/**
* The underlying output stream to be filtered.
*/
protected SafeOutputStream out;
/**
* Whether the stream is closed; implicitly initialized to false.
*/
private volatile boolean closed;
/**
* Object used to prevent a race on the 'closed' instance variable.
*/
private final Object closeLock = new Object();
/**
* Creates an output stream filter built on top of the specified
* underlying output stream.
*
* @param out the underlying output stream to be assigned to
* the field {@code this.out} for later use, or
* {@code null} if this instance is to be
* created without an underlying stream.
*/
public SafeFilterOutputStream(SafeOutputStream out) {
this.out = out;
}
/**
* Writes the specified {@code byte} to this output stream.
* <p>
* The {@code write} method of {@code FilterOutputStream}
* calls the {@code write} method of its underlying output stream,
* that is, it performs {@code out.write(b)}.
* <p>
* Implements the abstract {@code write} method of {@code SafeOutputStream}.
*
* @param b the {@code byte}.
*/
@Override
public void write(int b) {
out.write(b);
}
/**
* Writes {@code b.length} bytes to this output stream.
* <p>
* The {@code write} method of {@code FilterOutputStream}
* calls its {@code write} method of three arguments with the
* arguments {@code b}, {@code 0}, and
* {@code b.length}.
* <p>
* Note that this method does not call the one-argument
* {@code write} method of its underlying output stream with
* the single argument {@code b}.
*
* @param b the data to be written.
* @see SafeFilterOutputStream#write(byte[], int, int)
*/
@Override
public void write(byte b[]) {
write(b, 0, b.length);
}
/**
* Writes {@code len} bytes from the specified
* {@code byte} array starting at offset {@code off} to
* this output stream.
* <p>
* The {@code write} method of {@code FilterOutputStream}
* calls the {@code write} method of one argument on each
* {@code byte} to output.
* <p>
* Note that this method does not call the {@code write} method
* of its underlying output stream with the same arguments. Subclasses
* of {@code FilterOutputStream} should provide a more efficient
* implementation of this method.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
* @see SafeFilterOutputStream#write(int)
*/
@Override
public void write(byte b[], int off, int len) {
if ((off | len | (b.length - (len + off)) | (off + len)) < 0)
throw new IndexOutOfBoundsException();
for (int i = 0 ; i < len ; i++) {
write(b[off + i]);
}
}
/**
* Flushes this output stream and forces any buffered output bytes
* to be written out to the stream.
* <p>
* The {@code flush} method of {@code FilterOutputStream}
* calls the {@code flush} method of its underlying output stream.
*
* @see SafeFilterOutputStream#out
*/
@Override
public void flush() {
out.flush();
}
/**
* Closes this output stream and releases any system resources
* associated with the stream.
* <p>
* When not already closed, the {@code close} method of {@code
* FilterOutputStream} calls its {@code flush} method, and then
* calls the {@code close} method of its underlying output stream.
*
* @see SafeFilterOutputStream#flush()
* @see SafeFilterOutputStream#out
*/
@Override
public void close() {
if (closed) {
return;
}
synchronized (closeLock) {
if (closed) {
return;
}
closed = true;
}
Throwable flushException = null;
try {
flush();
} catch (Throwable e) {
flushException = e;
throw e;
} finally {
if (flushException == null) {
out.close();
} else {
try {
out.close();
} catch (Throwable closeException) {
// evaluate possible precedence of flushException over closeException
if ((flushException instanceof ThreadDeath) &&
!(closeException instanceof ThreadDeath)) {
flushException.addSuppressed(closeException);
throw (ThreadDeath) flushException;
}
if (flushException != closeException) {
closeException.addSuppressed(flushException);
}
throw closeException;
}
}
}
}
}

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package org.warp.commonutils.stream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
public abstract class SafeInputStream extends InputStream {
// MAX_SKIP_BUFFER_SIZE is used to determine the maximum buffer size to
// use when skipping.
private static final int MAX_SKIP_BUFFER_SIZE = 2048;
private static final int DEFAULT_BUFFER_SIZE = 8192;
@Override
public abstract int read();
public int read(byte b[]) {
return read(b, 0, b.length);
}
public int read(byte b[], int off, int len) {
Objects.checkFromIndexSize(off, len, b.length);
if (len == 0) {
return 0;
}
int c = read();
if (c == -1) {
return -1;
}
b[off] = (byte)c;
int i = 1;
for (; i < len ; i++) {
c = read();
if (c == -1) {
break;
}
b[off + i] = (byte)c;
}
return i;
}
public byte[] readAllBytes() {
return readNBytes(Integer.MAX_VALUE);
}
private static final int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8;
public byte[] readNBytes(int len) {
if (len < 0) {
throw new IllegalArgumentException("len < 0");
}
List<byte[]> bufs = null;
byte[] result = null;
int total = 0;
int remaining = len;
int n;
do {
byte[] buf = new byte[Math.min(remaining, DEFAULT_BUFFER_SIZE)];
int nread = 0;
// read to EOF which may read more or less than buffer size
while ((n = read(buf, nread,
Math.min(buf.length - nread, remaining))) > 0) {
nread += n;
remaining -= n;
}
if (nread > 0) {
if (MAX_BUFFER_SIZE - total < nread) {
throw new OutOfMemoryError("Required array size too large");
}
total += nread;
if (result == null) {
result = buf;
} else {
if (bufs == null) {
bufs = new ArrayList<>();
bufs.add(result);
}
bufs.add(buf);
}
}
// if the last call to read returned -1 or the number of bytes
// requested have been read then break
} while (n >= 0 && remaining > 0);
if (bufs == null) {
if (result == null) {
return new byte[0];
}
return result.length == total ?
result : Arrays.copyOf(result, total);
}
result = new byte[total];
int offset = 0;
remaining = total;
for (byte[] b : bufs) {
int count = Math.min(b.length, remaining);
System.arraycopy(b, 0, result, offset, count);
offset += count;
remaining -= count;
}
return result;
}
public int readNBytes(byte[] b, int off, int len) {
Objects.checkFromIndexSize(off, len, b.length);
int n = 0;
while (n < len) {
int count = read(b, off + n, len - n);
if (count < 0)
break;
n += count;
}
return n;
}
public long skip(long n) {
long remaining = n;
int nr;
if (n <= 0) {
return 0;
}
int size = (int)Math.min(MAX_SKIP_BUFFER_SIZE, remaining);
byte[] skipBuffer = new byte[size];
while (remaining > 0) {
nr = read(skipBuffer, 0, (int)Math.min(size, remaining));
if (nr < 0) {
break;
}
remaining -= nr;
}
return n - remaining;
}
public void skipNBytes(long n) {
if (n > 0) {
long ns = skip(n);
if (ns >= 0 && ns < n) { // skipped too few bytes
// adjust number to skip
n -= ns;
// read until requested number skipped or EOS reached
while (n > 0 && read() != -1) {
n--;
}
// if not enough skipped, then EOFE
if (n != 0) {
throw new IndexOutOfBoundsException();
}
} else if (ns != n) { // skipped negative or too many bytes
throw new IllegalArgumentException("Unable to skip exactly");
}
}
}
public int available() {
return 0;
}
public void close() {}
public synchronized void mark(int readlimit) {}
public synchronized void reset() {
throw new UnsupportedOperationException("mark/reset not supported");
}
public boolean markSupported() {
return false;
}
public long transferTo(OutputStream out) {
Objects.requireNonNull(out, "out");
long transferred = 0;
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int read;
while ((read = this.read(buffer, 0, DEFAULT_BUFFER_SIZE)) >= 0) {
try {
out.write(buffer, 0, read);
} catch (IOException e) {
throw new IllegalStateException(e);
}
transferred += read;
}
return transferred;
}
}

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package org.warp.commonutils.stream;
/*
* Copyright (C) 2005-2020 Sebastiano Vigna
*
* 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.
*/
import java.io.InputStream;
/** An {@link InputStream} that implements also the {@link SafeMeasurableStream} interface.
*
* @since 5.0.4
*/
public abstract class SafeMeasurableInputStream extends SafeInputStream implements SafeMeasurableStream {
}

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package org.warp.commonutils.stream;
/*
* Copyright (C) 2005-2020 Sebastiano Vigna
*
* 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.
*/
import java.io.OutputStream;
/** An {@link OutputStream} that implements also the {@link SafeMeasurableStream} interface.
*
* @since 6.0.0
*/
public abstract class SafeMeasurableOutputStream extends SafeOutputStream implements SafeMeasurableStream {
}

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package org.warp.commonutils.stream;
/*
* Copyright (C) 2005-2020 Sebastiano Vigna
*
* 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.
*/
/** An stream that provides eager access to its length,
* and keeps track of the current position (e.g., the number of bytes read so far, or the current
* position of the file pointer).
*
* <p>This class has two methods, both specified as optional. This apparently bizarre
* behaviour is necessary because of wrapper classes which use reflection
* to support those methods (see, e.g., {@link MeasurableInputStream}, {@link FastBufferedInputStream} and {@link FastBufferedOutputStream}).
*
* @since 6.0.0
*/
public interface SafeMeasurableStream {
/** Returns the overall length of this stream (optional operation). In most cases, this will require the
* stream to perform some extra action, possibly changing the state of the input stream itself (typically, reading
* all the bytes up to the end, or flushing on output stream).
* Implementing classes should always document what state will the input stream be in
* after calling this method, and which kind of exception could be thrown.
*/
long length();
/** Returns the current position in this stream (optional operation).
*
* <p>Usually, the position is just the number of bytes read or written
* since the stream was opened, but in the case of a
* {@link it.unimi.dsi.fastutil.io.RepositionableStream} it
* represent the current position.
*/
long position();
}

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package org.warp.commonutils.stream;
import java.io.Closeable;
import java.io.Flushable;
import java.io.OutputStream;
import java.util.Objects;
/**
* This abstract class is the superclass of all classes representing
* an output stream of bytes. An output stream accepts output bytes
* and sends them to some sink.
* <p>
* Applications that need to define a subclass of
* {@code OutputStream} must always provide at least a method
* that writes one byte of output.
*
* @author Arthur van Hoff
* @see java.io.BufferedOutputStream
* @see java.io.ByteArrayOutputStream
* @see java.io.DataOutputStream
* @see java.io.FilterOutputStream
* @see java.io.InputStream
* @see java.io.OutputStream#write(int)
* @since 1.0
*/
public abstract class SafeOutputStream extends OutputStream implements Closeable, Flushable {
/**
* Constructor for subclasses to call.
*/
public SafeOutputStream() {}
/**
* Returns a new {@code OutputStream} which discards all bytes. The
* returned stream is initially open. The stream is closed by calling
* the {@code close()} method. Subsequent calls to {@code close()} have
* no effect.
*
* <p> While the stream is open, the {@code write(int)}, {@code
* write(byte[])}, and {@code write(byte[], int, int)} methods do nothing.
* After the stream has been closed, these methods all throw {@code
* IOException}.
*
* <p> The {@code flush()} method does nothing.
*
* @return an {@code OutputStream} which discards all bytes
*
* @since 11
*/
public static java.io.OutputStream nullOutputStream() {
return new java.io.OutputStream() {
private volatile boolean closed;
private void ensureOpen() {
if (closed) {
throw new IllegalStateException("Stream closed");
}
}
@Override
public void write(int b) {
ensureOpen();
}
@Override
public void write(byte b[], int off, int len) {
Objects.checkFromIndexSize(off, len, b.length);
ensureOpen();
}
@Override
public void close() {
closed = true;
}
};
}
/**
* Writes the specified byte to this output stream. The general
* contract for {@code write} is that one byte is written
* to the output stream. The byte to be written is the eight
* low-order bits of the argument {@code b}. The 24
* high-order bits of {@code b} are ignored.
* <p>
* Subclasses of {@code OutputStream} must provide an
* implementation for this method.
*
* @param b the {@code byte}.
*/
public abstract void write(int b);
/**
* Writes {@code b.length} bytes from the specified byte array
* to this output stream. The general contract for {@code write(b)}
* is that it should have exactly the same effect as the call
* {@code write(b, 0, b.length)}.
*
* @param b the data.
* @see java.io.OutputStream#write(byte[], int, int)
*/
public void write(byte b[]) {
write(b, 0, b.length);
}
/**
* Writes {@code len} bytes from the specified byte array
* starting at offset {@code off} to this output stream.
* The general contract for {@code write(b, off, len)} is that
* some of the bytes in the array {@code b} are written to the
* output stream in order; element {@code b[off]} is the first
* byte written and {@code b[off+len-1]} is the last byte written
* by this operation.
* <p>
* The {@code write} method of {@code OutputStream} calls
* the write method of one argument on each of the bytes to be
* written out. Subclasses are encouraged to override this method and
* provide a more efficient implementation.
* <p>
* If {@code b} is {@code null}, a
* {@code NullPointerException} is thrown.
* <p>
* If {@code off} is negative, or {@code len} is negative, or
* {@code off+len} is greater than the length of the array
* {@code b}, then an {@code IndexOutOfBoundsException} is thrown.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
*/
public void write(byte b[], int off, int len) {
Objects.checkFromIndexSize(off, len, b.length);
// len == 0 condition implicitly handled by loop bounds
for (int i = 0 ; i < len ; i++) {
write(b[off + i]);
}
}
/**
* Flushes this output stream and forces any buffered output bytes
* to be written out. The general contract of {@code flush} is
* that calling it is an indication that, if any bytes previously
* written have been buffered by the implementation of the output
* stream, such bytes should immediately be written to their
* intended destination.
* <p>
* If the intended destination of this stream is an abstraction provided by
* the underlying operating system, for example a file, then flushing the
* stream guarantees only that bytes previously written to the stream are
* passed to the operating system for writing; it does not guarantee that
* they are actually written to a physical device such as a disk drive.
* <p>
* The {@code flush} method of {@code OutputStream} does nothing.
*
*/
public void flush() {
}
/**
* Closes this output stream and releases any system resources
* associated with this stream. The general contract of {@code close}
* is that it closes the output stream. A closed stream cannot perform
* output operations and cannot be reopened.
* <p>
* The {@code close} method of {@code OutputStream} does nothing.
*
*/
public void close() {
}
}

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package org.warp.commonutils.stream;
/**
* A {@code PushbackInputStream} adds
* functionality to another input stream, namely
* the ability to "push back" or "unread" bytes,
* by storing pushed-back bytes in an internal buffer.
* This is useful in situations where
* it is convenient for a fragment of code
* to read an indefinite number of data bytes
* that are delimited by a particular byte
* value; after reading the terminating byte,
* the code fragment can "unread" it, so that
* the next read operation on the input stream
* will reread the byte that was pushed back.
* For example, bytes representing the characters
* constituting an identifier might be terminated
* by a byte representing an operator character;
* a method whose job is to read just an identifier
* can read until it sees the operator and
* then push the operator back to be re-read.
*
* @author David Connelly
* @author Jonathan Payne
* @since 1.0
*/
public class SafePushbackInputStream extends SafeFilterInputStream {
/**
* The pushback buffer.
* @since 1.1
*/
protected byte[] buf;
/**
* The position within the pushback buffer from which the next byte will
* be read. When the buffer is empty, {@code pos} is equal to
* {@code buf.length}; when the buffer is full, {@code pos} is
* equal to zero.
*
* @since 1.1
*/
protected int pos;
/**
* Check to make sure that this stream has not been closed
*/
private void ensureOpen() {
if (in == null)
throw new IllegalStateException("Stream closed");
}
/**
* Creates a {@code PushbackInputStream}
* with a pushback buffer of the specified {@code size},
* and saves its argument, the input stream
* {@code in}, for later use. Initially,
* the pushback buffer is empty.
*
* @param in the input stream from which bytes will be read.
* @param size the size of the pushback buffer.
* @throws IllegalArgumentException if {@code size <= 0}
* @since 1.1
*/
public SafePushbackInputStream(SafeInputStream in, int size) {
super(in);
if (size <= 0) {
throw new IllegalArgumentException("size <= 0");
}
this.buf = new byte[size];
this.pos = size;
}
/**
* Creates a {@code PushbackInputStream}
* with a 1-byte pushback buffer, and saves its argument, the input stream
* {@code in}, for later use. Initially,
* the pushback buffer is empty.
*
* @param in the input stream from which bytes will be read.
*/
public SafePushbackInputStream(SafeInputStream in) {
this(in, 1);
}
/**
* Reads the next byte of data from this input stream. The value
* byte is returned as an {@code int} in the range
* {@code 0} to {@code 255}. If no byte is available
* because the end of the stream has been reached, the value
* {@code -1} is returned. This method blocks until input data
* is available, the end of the stream is detected, or an exception
* is thrown.
*
* <p> This method returns the most recently pushed-back byte, if there is
* one, and otherwise calls the {@code read} method of its underlying
* input stream and returns whatever value that method returns.
*
* @return the next byte of data, or {@code -1} if the end of the
* stream has been reached.
* or an I/O error occurs.
* @see java.io.InputStream#read()
*/
public int read() {
ensureOpen();
if (pos < buf.length) {
return buf[pos++] & 0xff;
}
return super.read();
}
/**
* Reads up to {@code len} bytes of data from this input stream into
* an array of bytes. This method first reads any pushed-back bytes; after
* that, if fewer than {@code len} bytes have been read then it
* reads from the underlying input stream. If {@code len} is not zero, the method
* blocks until at least 1 byte of input is available; otherwise, no
* bytes are read and {@code 0} is returned.
*
* @param b the buffer into which the data is read.
* @param off the start offset in the destination array {@code b}
* @param len the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or
* {@code -1} if there is no more data because the end of
* the stream has been reached.
* @throws NullPointerException If {@code b} is {@code null}.
* @throws IndexOutOfBoundsException If {@code off} is negative,
* {@code len} is negative, or {@code len} is greater than
* {@code b.length - off}
* or an I/O error occurs.
* @see java.io.InputStream#read(byte[], int, int)
*/
public int read(byte[] b, int off, int len) {
ensureOpen();
if (b == null) {
throw new NullPointerException();
} else if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return 0;
}
int avail = buf.length - pos;
if (avail > 0) {
if (len < avail) {
avail = len;
}
System.arraycopy(buf, pos, b, off, avail);
pos += avail;
off += avail;
len -= avail;
}
if (len > 0) {
len = super.read(b, off, len);
if (len == -1) {
return avail == 0 ? -1 : avail;
}
return avail + len;
}
return avail;
}
/**
* Pushes back a byte by copying it to the front of the pushback buffer.
* After this method returns, the next byte to be read will have the value
* {@code (byte)b}.
*
* @param b the {@code int} value whose low-order
* byte is to be pushed back.
*/
public void unread(int b) {
ensureOpen();
if (pos == 0) {
throw new IllegalStateException("Push back buffer is full");
}
buf[--pos] = (byte)b;
}
/**
* Pushes back a portion of an array of bytes by copying it to the front
* of the pushback buffer. After this method returns, the next byte to be
* read will have the value {@code b[off]}, the byte after that will
* have the value {@code b[off+1]}, and so forth.
*
* @param b the byte array to push back.
* @param off the start offset of the data.
* @param len the number of bytes to push back.
* @throws NullPointerException If {@code b} is {@code null}.
* @since 1.1
*/
public void unread(byte[] b, int off, int len) {
ensureOpen();
if (len > pos) {
throw new IllegalStateException("Push back buffer is full");
}
pos -= len;
System.arraycopy(b, off, buf, pos, len);
}
/**
* Pushes back an array of bytes by copying it to the front of the
* pushback buffer. After this method returns, the next byte to be read
* will have the value {@code b[0]}, the byte after that will have the
* value {@code b[1]}, and so forth.
*
* @param b the byte array to push back
* @throws NullPointerException If {@code b} is {@code null}.
* @since 1.1
*/
public void unread(byte[] b) {
unread(b, 0, b.length);
}
/**
* Returns an estimate of the number of bytes that can be read (or
* skipped over) from this input stream without blocking by the next
* invocation of a method for this input stream. The next invocation might be
* the same thread or another thread. A single read or skip of this
* many bytes will not block, but may read or skip fewer bytes.
*
* <p> The method returns the sum of the number of bytes that have been
* pushed back and the value returned by {@link
* SafeFilterInputStream#available available}.
*
* @return the number of bytes that can be read (or skipped over) from
* the input stream without blocking.
* @see SafeFilterInputStream#in
* @see java.io.InputStream#available()
*/
public int available() {
ensureOpen();
int n = buf.length - pos;
int avail = super.available();
return n > (Integer.MAX_VALUE - avail)
? Integer.MAX_VALUE
: n + avail;
}
/**
* Skips over and discards {@code n} bytes of data from this
* input stream. The {@code skip} method may, for a variety of
* reasons, end up skipping over some smaller number of bytes,
* possibly zero. If {@code n} is negative, no bytes are skipped.
*
* <p> The {@code skip} method of {@code PushbackInputStream}
* first skips over the bytes in the pushback buffer, if any. It then
* calls the {@code skip} method of the underlying input stream if
* more bytes need to be skipped. The actual number of bytes skipped
* is returned.
*
* @param n {@inheritDoc}
* @return {@inheritDoc}
* @see SafeFilterInputStream#in
* @see java.io.InputStream#skip(long n)
* @since 1.2
*/
public long skip(long n) {
ensureOpen();
if (n <= 0) {
return 0;
}
long pskip = buf.length - pos;
if (pskip > 0) {
if (n < pskip) {
pskip = n;
}
pos += pskip;
n -= pskip;
}
if (n > 0) {
pskip += super.skip(n);
}
return pskip;
}
/**
* Tests if this input stream supports the {@code mark} and
* {@code reset} methods, which it does not.
*
* @return {@code false}, since this class does not support the
* {@code mark} and {@code reset} methods.
* @see java.io.InputStream#mark(int)
* @see java.io.InputStream#reset()
*/
public boolean markSupported() {
return false;
}
/**
* Marks the current position in this input stream.
*
* <p> The {@code mark} method of {@code PushbackInputStream}
* does nothing.
*
* @param readlimit the maximum limit of bytes that can be read before
* the mark position becomes invalid.
* @see java.io.InputStream#reset()
*/
public synchronized void mark(int readlimit) {
}
/**
* Repositions this stream to the position at the time the
* {@code mark} method was last called on this input stream.
*
* <p> The method {@code reset} for class
* {@code PushbackInputStream} does nothing except throw an
* {@code IOException}.
*
* @see java.io.InputStream#mark(int)
* @see java.io.IOException
*/
public synchronized void reset() {
throw new UnsupportedOperationException("mark/reset not supported");
}
/**
* Closes this input stream and releases any system resources
* associated with the stream.
* Once the stream has been closed, further read(), unread(),
* available(), reset(), or skip() invocations will throw an IOException.
* Closing a previously closed stream has no effect.
*
*/
public synchronized void close() {
if (in == null)
return;
in.close();
in = null;
buf = null;
}
}

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package org.warp.commonutils.stream;
/*
* Copyright (C) 2005-2020 Sebastiano Vigna
*
* 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.
*/
/** A basic interface specifying positioning methods for a byte stream.
*
* @author Sebastiano Vigna
* @since 4.4
*/
public interface SafeRepositionableStream {
/** Sets the current stream position.
*
* @param newPosition the new stream position.
*/
void position(long newPosition);
/** Returns the current stream position.
*
* @return the current stream position.
*/
long position();
}