src/share/classes/javax/imageio/stream/ImageInputStream.java

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   1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


 429      * of additional bytes to be read. These bytes are then converted
 430      * to characters by considering them in groups. The length of each
 431      * group is computed from the value of the first byte of the
 432      * group. The byte following a group, if any, is the first byte of
 433      * the next group.
 434      *
 435      * <p> If the first byte of a group matches the bit pattern
 436      * <code>0xxxxxxx</code> (where <code>x</code> means "may be
 437      * <code>0</code> or <code>1</code>"), then the group consists of
 438      * just that byte. The byte is zero-extended to form a character.
 439      *
 440      * <p> If the first byte of a group matches the bit pattern
 441      * <code>110xxxxx</code>, then the group consists of that byte
 442      * <code>a</code> and a second byte <code>b</code>. If there is no
 443      * byte <code>b</code> (because byte <code>a</code> was the last
 444      * of the bytes to be read), or if byte <code>b</code> does not
 445      * match the bit pattern <code>10xxxxxx</code>, then a
 446      * <code>UTFDataFormatException</code> is thrown. Otherwise, the
 447      * group is converted to the character:
 448      *
 449      * <p> <pre><code>
 450      * (char)(((a&amp; 0x1F) &lt;&lt; 6) | (b &amp; 0x3F))
 451      * </code></pre>
 452      *
 453      * If the first byte of a group matches the bit pattern
 454      * <code>1110xxxx</code>, then the group consists of that byte
 455      * <code>a</code> and two more bytes <code>b</code> and
 456      * <code>c</code>.  If there is no byte <code>c</code> (because
 457      * byte <code>a</code> was one of the last two of the bytes to be
 458      * read), or either byte <code>b</code> or byte <code>c</code>
 459      * does not match the bit pattern <code>10xxxxxx</code>, then a
 460      * <code>UTFDataFormatException</code> is thrown. Otherwise, the
 461      * group is converted to the character:
 462      *
 463      * <p> <pre><code>
 464      * (char)(((a &amp; 0x0F) &lt;&lt; 12) | ((b &amp; 0x3F) &lt;&lt; 6) | (c &amp; 0x3F))
 465      * </code></pre>
 466      *
 467      * If the first byte of a group matches the pattern
 468      * <code>1111xxxx</code> or the pattern <code>10xxxxxx</code>,
 469      * then a <code>UTFDataFormatException</code> is thrown.
 470      *
 471      * <p> If end of file is encountered at any time during this
 472      * entire process, then an <code>java.io.EOFException</code> is thrown.
 473      *
 474      * <p> After every group has been converted to a character by this
 475      * process, the characters are gathered, in the same order in
 476      * which their corresponding groups were read from the input
 477      * stream, to form a <code>String</code>, which is returned.
 478      *
 479      * <p> The current byte order setting is ignored.
 480      *
 481      * <p> The bit offset within the stream is reset to zero before
 482      * the read occurs.
 483      *


   1 /*
   2  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


 429      * of additional bytes to be read. These bytes are then converted
 430      * to characters by considering them in groups. The length of each
 431      * group is computed from the value of the first byte of the
 432      * group. The byte following a group, if any, is the first byte of
 433      * the next group.
 434      *
 435      * <p> If the first byte of a group matches the bit pattern
 436      * <code>0xxxxxxx</code> (where <code>x</code> means "may be
 437      * <code>0</code> or <code>1</code>"), then the group consists of
 438      * just that byte. The byte is zero-extended to form a character.
 439      *
 440      * <p> If the first byte of a group matches the bit pattern
 441      * <code>110xxxxx</code>, then the group consists of that byte
 442      * <code>a</code> and a second byte <code>b</code>. If there is no
 443      * byte <code>b</code> (because byte <code>a</code> was the last
 444      * of the bytes to be read), or if byte <code>b</code> does not
 445      * match the bit pattern <code>10xxxxxx</code>, then a
 446      * <code>UTFDataFormatException</code> is thrown. Otherwise, the
 447      * group is converted to the character:
 448      *
 449      * <pre><code>
 450      * (char)(((a&amp; 0x1F) &lt;&lt; 6) | (b &amp; 0x3F))
 451      * </code></pre>
 452      *
 453      * If the first byte of a group matches the bit pattern
 454      * <code>1110xxxx</code>, then the group consists of that byte
 455      * <code>a</code> and two more bytes <code>b</code> and
 456      * <code>c</code>.  If there is no byte <code>c</code> (because
 457      * byte <code>a</code> was one of the last two of the bytes to be
 458      * read), or either byte <code>b</code> or byte <code>c</code>
 459      * does not match the bit pattern <code>10xxxxxx</code>, then a
 460      * <code>UTFDataFormatException</code> is thrown. Otherwise, the
 461      * group is converted to the character:
 462      *
 463      * <pre><code>
 464      * (char)(((a &amp; 0x0F) &lt;&lt; 12) | ((b &amp; 0x3F) &lt;&lt; 6) | (c &amp; 0x3F))
 465      * </code></pre>
 466      *
 467      * If the first byte of a group matches the pattern
 468      * <code>1111xxxx</code> or the pattern <code>10xxxxxx</code>,
 469      * then a <code>UTFDataFormatException</code> is thrown.
 470      *
 471      * <p> If end of file is encountered at any time during this
 472      * entire process, then an <code>java.io.EOFException</code> is thrown.
 473      *
 474      * <p> After every group has been converted to a character by this
 475      * process, the characters are gathered, in the same order in
 476      * which their corresponding groups were read from the input
 477      * stream, to form a <code>String</code>, which is returned.
 478      *
 479      * <p> The current byte order setting is ignored.
 480      *
 481      * <p> The bit offset within the stream is reset to zero before
 482      * the read occurs.
 483      *