3261N/A * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * A seekable input stream interface for use by 0N/A * <code>ImageReader</code>s. Various input sources, such as 0N/A * <code>InputStream</code>s and <code>File</code>s, 0N/A * as well as future fast I/O sources may be "wrapped" by a suitable 0N/A * implementation of this interface for use by the Image I/O API. 0N/A * @see ImageInputStreamImpl 0N/A * @see FileImageInputStream 0N/A * @see FileCacheImageInputStream 0N/A * @see MemoryCacheImageInputStream 0N/A * Sets the desired byte order for future reads of data values 0N/A * from this stream. For example, the sequence of bytes '0x01 0N/A * 0x02 0x03 0x04' if read as a 4-byte integer would have the 0N/A * value '0x01020304' using network byte order and the value 0N/A * '0x04030201' under the reverse byte order. 0N/A * <p> The enumeration class <code>java.nio.ByteOrder</code> is 0N/A * used to specify the byte order. A value of 0N/A * <code>ByteOrder.BIG_ENDIAN</code> specifies so-called 0N/A * big-endian or network byte order, in which the high-order byte 0N/A * comes first. Motorola and Sparc processors store data in this 0N/A * format, while Intel processors store data in the reverse 0N/A * <code>ByteOrder.LITTLE_ENDIAN</code> order. 0N/A * <p> The byte order has no effect on the results returned from 0N/A * the <code>readBits</code> method (or the value written by 0N/A * <code>ImageOutputStream.writeBits</code>). 0N/A * @param byteOrder one of <code>ByteOrder.BIG_ENDIAN</code> or 0N/A * <code>java.nio.ByteOrder.LITTLE_ENDIAN</code>, indicating whether 0N/A * network byte order or its reverse will be used for future 0N/A * @see java.nio.ByteOrder 0N/A * @see #getByteOrder 0N/A * @see #readBits(int) 0N/A * Returns the byte order with which data values will be read from 0N/A * this stream as an instance of the 0N/A * <code>java.nio.ByteOrder</code> enumeration. 0N/A * @return one of <code>ByteOrder.BIG_ENDIAN</code> or 0N/A * <code>ByteOrder.LITTLE_ENDIAN</code>, indicating which byte 0N/A * order is being used. 0N/A * @see java.nio.ByteOrder 0N/A * @see #setByteOrder 0N/A * Reads a single byte from the stream and returns it as an 0N/A * integer between 0 and 255. If the end of the stream is 0N/A * reached, -1 is returned. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a byte value from the stream, as an int, or -1 to 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads up to <code>b.length</code> bytes from the stream, and 0N/A * stores them into <code>b</code> starting at index 0. The 0N/A * number of bytes read is returned. If no bytes can be read 0N/A * because the end of the stream has been reached, -1 is returned. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param b an array of bytes to be written to. 0N/A * @return the number of bytes actually read, or <code>-1</code> 0N/A * @exception NullPointerException if <code>b</code> is 0N/A * <code>null</code>. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads up to <code>len</code> bytes from the stream, and stores 0N/A * them into <code>b</code> starting at index <code>off</code>. 0N/A * The number of bytes read is returned. If no bytes can be read 0N/A * because the end of the stream has been reached, <code>-1</code> 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param b an array of bytes to be written to. 0N/A * @param off the starting position within <code>b</code> to write to. 0N/A * @param len the maximum number of <code>byte</code>s to read. 0N/A * @return the number of bytes actually read, or <code>-1</code> 0N/A * @exception NullPointerException if <code>b</code> is 0N/A * <code>null</code>. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>b.length</code>. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads up to <code>len</code> bytes from the stream, and 0N/A * modifies the supplied <code>IIOByteBuffer</code> to indicate 0N/A * the byte array, offset, and length where the data may be found. 0N/A * The caller should not attempt to modify the data found in the 0N/A * <code>IIOByteBuffer</code>. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param buf an IIOByteBuffer object to be modified. 0N/A * @param len the maximum number of <code>byte</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>len</code> is 0N/A * @exception NullPointerException if <code>buf</code> is 0N/A * <code>null</code>. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads a byte from the stream and returns a <code>boolean</code> 0N/A * value of <code>true</code> if it is nonzero, <code>false</code> 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a boolean value from the stream. 0N/A * @exception EOFException if the end of the stream is reached. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads a byte from the stream and returns it as a 0N/A * <code>byte</code> value. Byte values between <code>0x00</code> 0N/A * and <code>0x7f</code> represent integer values between 0N/A * <code>0</code> and <code>127</code>. Values between 0N/A * <code>0x80</code> and <code>0xff</code> represent negative 0N/A * values from <code>-128</code> to <code>/1</code>. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a signed byte value from the stream. 0N/A * @exception EOFException if the end of the stream is reached. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads a byte from the stream, and (conceptually) converts it to 0N/A * an int, masks it with <code>0xff</code> in order to strip off 0N/A * any sign-extension bits, and returns it as a <code>byte</code> 0N/A * <p> Thus, byte values between <code>0x00</code> and 0N/A * <code>0x7f</code> are simply returned as integer values between 0N/A * <code>0</code> and <code>127</code>. Values between 0N/A * <code>0x80</code> and <code>0xff</code>, which normally 0N/A * represent negative <code>byte</code>values, will be mapped into 0N/A * positive integers between <code>128</code> and 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return an unsigned byte value from the stream. 0N/A * @exception EOFException if the end of the stream is reached. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads two bytes from the stream, and (conceptually) 0N/A * concatenates them according to the current byte order, and 0N/A * returns the result as a <code>short</code> value. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a signed short value from the stream. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getByteOrder 0N/A * Reads two bytes from the stream, and (conceptually) 0N/A * concatenates them according to the current byte order, converts 0N/A * the resulting value to an <code>int</code>, masks it with 0N/A * <code>0xffff</code> in order to strip off any sign-extension 0N/A * buts, and returns the result as an unsigned <code>int</code> 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return an unsigned short value from the stream, as an int. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getByteOrder 0N/A * Equivalent to <code>readUnsignedShort</code>, except that the 0N/A * result is returned using the <code>char</code> datatype. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return an unsigned char value from the stream. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #readUnsignedShort 0N/A * Reads 4 bytes from the stream, and (conceptually) concatenates 0N/A * them according to the current byte order and returns the result 0N/A * as an <code>int</code>. 0N/A * <p> The bit offset within the stream is ignored and treated as 0N/A * though it were zero. 0N/A * @return a signed int value from the stream. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getByteOrder 0N/A * Reads 4 bytes from the stream, and (conceptually) concatenates 0N/A * them according to the current byte order, converts the result 0N/A * to a long, masks it with <code>0xffffffffL</code> in order to 0N/A * strip off any sign-extension bits, and returns the result as an 0N/A * unsigned <code>long</code> value. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return an unsigned int value from the stream, as a long. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getByteOrder 0N/A * Reads 8 bytes from the stream, and (conceptually) concatenates 0N/A * them according to the current byte order and returns the result 0N/A * as a <code>long</code>. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a signed long value from the stream. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getByteOrder 0N/A * Reads 4 bytes from the stream, and (conceptually) concatenates 0N/A * them according to the current byte order and returns the result 0N/A * as a <code>float</code>. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a float value from the stream. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getByteOrder 0N/A * Reads 8 bytes from the stream, and (conceptually) concatenates 0N/A * them according to the current byte order and returns the result 0N/A * as a <code>double</code>. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a double value from the stream. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getByteOrder 0N/A * Reads the next line of text from the input stream. It reads 0N/A * successive bytes, converting each byte separately into a 0N/A * character, until it encounters a line terminator or end of 0N/A * file; the characters read are then returned as a 0N/A * <code>String</code>. Note that because this method processes 0N/A * bytes, it does not support input of the full Unicode character 0N/A * <p> If end of file is encountered before even one byte can be 0N/A * read, then <code>null</code> is returned. Otherwise, each byte 0N/A * that is read is converted to type <code>char</code> by 0N/A * zero-extension. If the character <code>'\n'</code> is 0N/A * encountered, it is discarded and reading ceases. If the 0N/A * character <code>'\r'</code> is encountered, it is discarded 0N/A * and, if the following byte converts  to the character 0N/A * <code>'\n'</code>, then that is discarded also; reading then 0N/A * ceases. If end of file is encountered before either of the 0N/A * characters <code>'\n'</code> and <code>'\r'</code> is 0N/A * encountered, reading ceases. Once reading has ceased, a 0N/A * <code>String</code> is returned that contains all the 0N/A * characters read and not discarded, taken in order. Note that 0N/A * every character in this string will have a value less than 0N/A * <code>\u0100</code>, that is, <code>(char)256</code>. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @return a String containing a line of text from the stream. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads in a string that has been encoded using a 0N/A * format. The general contract of <code>readUTF</code> is that 0N/A * it reads a representation of a Unicode character string encoded 0N/A * in modified UTF-8 format; this string of characters is 0N/A * then returned as a <code>String</code>. 0N/A * <p> First, two bytes are read and used to construct an unsigned 0N/A * 16-bit integer in the manner of the 0N/A * <code>readUnsignedShort</code> method, using network byte order 0N/A * (regardless of the current byte order setting). This integer 0N/A * value is called the <i>UTF length</i> and specifies the number 0N/A * of additional bytes to be read. These bytes are then converted 0N/A * to characters by considering them in groups. The length of each 0N/A * group is computed from the value of the first byte of the 0N/A * group. The byte following a group, if any, is the first byte of 0N/A * <p> If the first byte of a group matches the bit pattern 0N/A * <code>0xxxxxxx</code> (where <code>x</code> means "may be 0N/A * <code>0</code> or <code>1</code>"), then the group consists of 0N/A * just that byte. The byte is zero-extended to form a character. 0N/A * <p> If the first byte of a group matches the bit pattern 0N/A * <code>110xxxxx</code>, then the group consists of that byte 0N/A * <code>a</code> and a second byte <code>b</code>. If there is no 0N/A * byte <code>b</code> (because byte <code>a</code> was the last 0N/A * of the bytes to be read), or if byte <code>b</code> does not 0N/A * match the bit pattern <code>10xxxxxx</code>, then a 0N/A * <code>UTFDataFormatException</code> is thrown. Otherwise, the 0N/A * group is converted to the character: 0N/A * (char)(((a& 0x1F) << 6) | (b & 0x3F)) 0N/A * If the first byte of a group matches the bit pattern 0N/A * <code>1110xxxx</code>, then the group consists of that byte 0N/A * <code>a</code> and two more bytes <code>b</code> and 0N/A * <code>c</code>. If there is no byte <code>c</code> (because 0N/A * byte <code>a</code> was one of the last two of the bytes to be 0N/A * read), or either byte <code>b</code> or byte <code>c</code> 0N/A * does not match the bit pattern <code>10xxxxxx</code>, then a 0N/A * <code>UTFDataFormatException</code> is thrown. Otherwise, the 0N/A * group is converted to the character: 0N/A * (char)(((a & 0x0F) << 12) | ((b & 0x3F) << 6) | (c & 0x3F)) 0N/A * If the first byte of a group matches the pattern 0N/A * <code>1111xxxx</code> or the pattern <code>10xxxxxx</code>, 0N/A * then a <code>UTFDataFormatException</code> is thrown. 0N/A * <p> If end of file is encountered at any time during this 0N/A * entire process, then an <code>EOFException</code> is thrown. 0N/A * <p> After every group has been converted to a character by this 0N/A * process, the characters are gathered, in the same order in 0N/A * which their corresponding groups were read from the input 0N/A * stream, to form a <code>String</code>, which is returned. 0N/A * <p> The current byte order setting is ignored. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * <p><strong>Note:</strong> This method should not be used in 0N/A * the implementation of image formats that use standard UTF-8, 0N/A * because the modified UTF-8 used here is incompatible with 0N/A * @return a String read from the stream. 0N/A * @exception EOFException if this stream reaches the end 0N/A * before reading all the bytes. 0N/A * @exception UTFDataFormatException if the bytes do not represent a 0N/A * valid modified UTF-8 encoding of a string. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>len</code> bytes from the stream, and stores them 0N/A * into <code>b</code> starting at index <code>off</code>. 0N/A * If the end of the stream is reached, an <code>EOFException</code> 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param b an array of bytes to be written to. 0N/A * @param off the starting position within <code>b</code> to write to. 0N/A * @param len the maximum number of <code>byte</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>b.length</code>. 0N/A * @exception NullPointerException if <code>b</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>b.length</code> bytes from the stream, and stores them 0N/A * into <code>b</code> starting at index <code>0</code>. 0N/A * If the end of the stream is reached, an <code>EOFException</code> 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param b an array of <code>byte</code>s. 0N/A * @exception NullPointerException if <code>b</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>len</code> shorts (signed 16-bit integers) from the 0N/A * stream according to the current byte order, and 0N/A * stores them into <code>s</code> starting at index 0N/A * <code>off</code>. If the end of the stream is reached, an 0N/A * <code>EOFException</code> will be thrown. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param s an array of shorts to be written to. 0N/A * @param off the starting position withinb to write to. 0N/A * @param len the maximum number of <code>short</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>s.length</code>. 0N/A * @exception NullPointerException if <code>s</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>len</code> chars (unsigned 16-bit integers) from the 0N/A * stream according to the current byte order, and 0N/A * stores them into <code>c</code> starting at index 0N/A * <code>off</code>. If the end of the stream is reached, an 0N/A * <code>EOFException</code> will be thrown. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param c an array of chars to be written to. 0N/A * @param off the starting position withinb to write to. 0N/A * @param len the maximum number of <code>char</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>c.length</code>. 0N/A * @exception NullPointerException if <code>c</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>len</code> ints (signed 32-bit integers) from the 0N/A * stream according to the current byte order, and 0N/A * stores them into <code>i</code> starting at index 0N/A * <code>off</code>. If the end of the stream is reached, an 0N/A * <code>EOFException</code> will be thrown. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param i an array of ints to be written to. 0N/A * @param off the starting position withinb to write to. 0N/A * @param len the maximum number of <code>int</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>i.length</code>. 0N/A * @exception NullPointerException if <code>i</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>len</code> longs (signed 64-bit integers) from the 0N/A * stream according to the current byte order, and 0N/A * stores them into <code>l</code> starting at index 0N/A * <code>off</code>. If the end of the stream is reached, an 0N/A * <code>EOFException</code> will be thrown. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param l an array of longs to be written to. 0N/A * @param off the starting position withinb to write to. 0N/A * @param len the maximum number of <code>long</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>l.length</code>. 0N/A * @exception NullPointerException if <code>l</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>len</code> floats (32-bit IEEE single-precision 0N/A * floats) from the stream according to the current byte order, 0N/A * and stores them into <code>f</code> starting at 0N/A * index <code>off</code>. If the end of the stream is reached, 0N/A * an <code>EOFException</code> will be thrown. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param f an array of floats to be written to. 0N/A * @param off the starting position withinb to write to. 0N/A * @param len the maximum number of <code>float</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>f.length</code>. 0N/A * @exception NullPointerException if <code>f</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads <code>len</code> doubles (64-bit IEEE double-precision 0N/A * floats) from the stream according to the current byte order, 0N/A * and stores them into <code>d</code> starting at 0N/A * index <code>off</code>. If the end of the stream is reached, 0N/A * an <code>EOFException</code> will be thrown. 0N/A * <p> The bit offset within the stream is reset to zero before 0N/A * @param d an array of doubles to be written to. 0N/A * @param off the starting position withinb to write to. 0N/A * @param len the maximum number of <code>double</code>s to read. 0N/A * @exception IndexOutOfBoundsException if <code>off</code> is 0N/A * negative, <code>len</code> is negative, or <code>off + 0N/A * len</code> is greater than <code>d.length</code>. 0N/A * @exception NullPointerException if <code>d</code> is 0N/A * <code>null</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bytes. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Returns the current byte position of the stream. The next read 0N/A * will take place starting at this offset. 0N/A * @return a long containing the position of the stream. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Returns the current bit offset, as an integer between 0 and 7, 0N/A * inclusive. The bit offset is updated implicitly by calls to 0N/A * the <code>readBits</code> method. A value of 0 indicates the 0N/A * most-significant bit, and a value of 7 indicates the least 0N/A * significant bit, of the byte being read. 0N/A * <p> The bit offset is set to 0 when a stream is first 0N/A * opened, and is reset to 0 by calls to <code>seek</code>, 0N/A * <code>skipBytes</code>, or any <code>read</code> or 0N/A * <code>readFully</code> method. 0N/A * @return an <code>int</code> containing the bit offset between 0N/A * 0 and 7, inclusive. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #setBitOffset 0N/A * Sets the bit offset to an integer between 0 and 7, inclusive. 0N/A * The byte offset within the stream, as returned by 0N/A * <code>getStreamPosition</code>, is left unchanged. 0N/A * A value of 0 indicates the 0N/A * most-significant bit, and a value of 7 indicates the least 0N/A * significant bit, of the byte being read. 0N/A * @param bitOffset the desired offset, as an <code>int</code> 0N/A * between 0 and 7, inclusive. 0N/A * @exception IllegalArgumentException if <code>bitOffset</code> 0N/A * is not between 0 and 7, inclusive. 0N/A * @exception IOException if an I/O error occurs. 0N/A * @see #getBitOffset 0N/A * Reads a single bit from the stream and returns it as an 0N/A * <code>int</code> with the value <code>0</code> or 0N/A * <code>1</code>. The bit offset is advanced by one and reduced 0N/A * @return an <code>int</code> containing the value <code>0</code> 0N/A * or <code>1</code>. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bits. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Reads a bitstring from the stream and returns it as a 0N/A * <code>long</code>, with the first bit read becoming the most 0N/A * significant bit of the output. The read starts within the byte 0N/A * indicated by <code>getStreamPosition</code>, at the bit given 0N/A * by <code>getBitOffset</code>. The bit offset is advanced by 0N/A * <code>numBits</code> and reduced modulo 8. 0N/A * <p> The byte order of the stream has no effect on this 0N/A * method. The return value of this method is constructed as 0N/A * though the bits were read one at a time, and shifted into 0N/A * the right side of the return value, as shown by the following 0N/A * for (int i = 0; i < numBits; i++) { 0N/A * accum <<= 1; // Shift left one bit to make room 0N/A * accum |= readBit(); 0N/A * Note that the result of <code>readBits(32)</code> may thus not 0N/A * be equal to that of <code>readInt()</code> if a reverse network 0N/A * byte order is being used (i.e., <code>getByteOrder() == 0N/A * <p> If the end of the stream is encountered before all the bits 0N/A * have been read, an <code>EOFException</code> is thrown. 0N/A * @param numBits the number of bits to read, as an <code>int</code> 0N/A * between 0 and 64, inclusive. 0N/A * @return the bitstring, as a <code>long</code> with the last bit 0N/A * read stored in the least significant bit. 0N/A * @exception IllegalArgumentException if <code>numBits</code> 0N/A * is not between 0 and 64, inclusive. 0N/A * @exception EOFException if the stream reaches the end before 0N/A * reading all the bits. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Returns the total length of the stream, if known. Otherwise, 0N/A * <code>-1</code> is returned. 0N/A * @return a <code>long</code> containing the length of the 0N/A * stream, if known, or else <code>-1</code>. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Moves the stream position forward by a given number of bytes. It 0N/A * is possible that this method will only be able to skip forward 0N/A * by a smaller number of bytes than requested, for example if the 0N/A * end of the stream is reached. In all cases, the actual number 0N/A * of bytes skipped is returned. The bit offset is set to zero 0N/A * prior to advancing the position. 0N/A * @param n an <code>int</code> containing the number of bytes to 0N/A * @return an <code>int</code> representing the number of bytes skipped. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Moves the stream position forward by a given number of bytes. 0N/A * This method is identical to <code>skipBytes(int)</code> except 0N/A * that it allows for a larger skip distance. 0N/A * @param n a <code>long</code> containing the number of bytes to 0N/A * @return a <code>long</code> representing the number of bytes 0N/A * @exception IOException if an I/O error occurs. 0N/A * Sets the current stream position to the desired location. The 0N/A * next read will occur at this location. The bit offset is set 0N/A * <p> An <code>IndexOutOfBoundsException</code> will be thrown if 0N/A * <code>pos</code> is smaller than the flushed position (as 0N/A * returned by <code>getflushedPosition</code>). 0N/A * <p> It is legal to seek past the end of the file; an 0N/A * <code>EOFException</code> will be thrown only if a read is 0N/A * @param pos a <code>long</code> containing the desired file 0N/A * @exception IndexOutOfBoundsException if <code>pos</code> is smaller 0N/A * than the flushed position. 0N/A * @exception IOException if any other I/O error occurs. 0N/A * Marks a position in the stream to be returned to by a 0N/A * subsequent call to <code>reset</code>. Unlike a standard 0N/A * <code>InputStream</code>, all <code>ImageInputStream</code>s 0N/A * support marking. Additionally, calls to <code>mark</code> and 0N/A * <code>reset</code> may be nested arbitrarily. 0N/A * <p> Unlike the <code>mark</code> methods declared by the 0N/A * <code>Reader</code> and <code>InputStream</code> interfaces, no 0N/A * <code>readLimit</code> parameter is used. An arbitrary amount 0N/A * of data may be read following the call to <code>mark</code>. 0N/A * <p> The bit position used by the <code>readBits</code> method 0N/A * is saved and restored by each pair of calls to 0N/A * <code>mark</code> and <code>reset</code>. 0N/A * <p> Note that it is valid for an <code>ImageReader</code> to call 0N/A * <code>flushBefore</code> as part of a read operation. 0N/A * Therefore, if an application calls <code>mark</code> prior to 0N/A * passing that stream to an <code>ImageReader</code>, the application 0N/A * should not assume that the marked position will remain valid after 0N/A * the read operation has completed. 0N/A * Returns the stream pointer to its previous position, including 0N/A * the bit offset, at the time of the most recent unmatched call 0N/A * to <code>mark</code>. 0N/A * <p> Calls to <code>reset</code> without a corresponding call 0N/A * to <code>mark</code> have no effect. 0N/A * <p> An <code>IOException</code> will be thrown if the previous 0N/A * marked position lies in the discarded portion of the stream. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Discards the initial portion of the stream prior to the 0N/A * indicated postion. Attempting to seek to an offset within the 0N/A * flushed portion of the stream will result in an 0N/A * <code>IndexOutOfBoundsException</code>. 0N/A * <p> Calling <code>flushBefore</code> may allow classes 0N/A * implementing this interface to free up resources such as memory 0N/A * or disk space that are being used to store data from the 0N/A * @param pos a <code>long</code> containing the length of the 0N/A * stream prefix that may be flushed. 0N/A * @exception IndexOutOfBoundsException if <code>pos</code> lies 0N/A * in the flushed portion of the stream or past the current stream 0N/A * @exception IOException if an I/O error occurs. 0N/A * Discards the initial position of the stream prior to the current 0N/A * stream position. Equivalent to 0N/A * <code>flushBefore(getStreamPosition())</code>. 0N/A * @exception IOException if an I/O error occurs. 0N/A * Returns the earliest position in the stream to which seeking 0N/A * may be performed. The returned value will be the maximum of 0N/A * all values passed into previous calls to 0N/A * <code>flushBefore</code>. 0N/A * @return the earliest legal position for seeking, as a 0N/A * <code>long</code>. 0N/A * Returns <code>true</code> if this <code>ImageInputStream</code> 0N/A * caches data itself in order to allow seeking backwards. 0N/A * Applications may consult this in order to decide how frequently, 0N/A * or whether, to flush in order to conserve cache resources. 0N/A * @return <code>true</code> if this <code>ImageInputStream</code> 0N/A * @see #isCachedMemory 0N/A * @see #isCachedFile 0N/A * Returns <code>true</code> if this <code>ImageInputStream</code> 0N/A * caches data itself in order to allow seeking backwards, and 0N/A * the cache is kept in main memory. Applications may consult 0N/A * this in order to decide how frequently, or whether, to flush 0N/A * in order to conserve cache resources. 0N/A * @return <code>true</code> if this <code>ImageInputStream</code> 0N/A * caches data in main memory. 0N/A * @see #isCachedFile 0N/A * Returns <code>true</code> if this <code>ImageInputStream</code> 0N/A * caches data itself in order to allow seeking backwards, and 0N/A * the cache is kept in a temporary file. Applications may consult 0N/A * this in order to decide how frequently, or whether, to flush 0N/A * in order to conserve cache resources. 0N/A * @return <code>true</code> if this <code>ImageInputStream</code> 0N/A * caches data in a temporary file. 0N/A * @see #isCachedMemory 0N/A * Closes the stream. Attempts to access a stream that has been 0N/A * closed may result in <code>IOException</code>s or incorrect 0N/A * behavior. Calling this method may allow classes implementing 0N/A * this interface to release resources associated with the stream 0N/A * such as memory, disk space, or file descriptors. 0N/A * @exception IOException if an I/O error occurs.