jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/dtdparser/XmlReader.java@e530533619ec (annotated)

src/share/jaxws_classes/com/sun/xml/internal/dtdparser/XmlReader.java@e530533619ec (annotated)

src/share/jaxws_classes/com/sun/xml/internal/dtdparser/XmlReader.java

Thu, 12 Oct 2017 19:44:07 +0800

author: aoqi
date: Thu, 12 Oct 2017 19:44:07 +0800
changeset 760: e530533619ec
parent 637: 9c07ef4934dd
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.xml.internal.dtdparser;
 import java.io.ByteArrayInputStream;
 import java.io.CharConversionException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.PushbackInputStream;
 import java.io.Reader;
 import java.util.Hashtable;
 // NOTE:  Add I18N support to this class when JDK gets the ability to
 // defer selection of locale for exception messages ... use the same
 // technique for both.
 /**
  * This handles several XML-related tasks that normal java.io Readers
  * don't support, inluding use of IETF standard encoding names and
  * automatic detection of most XML encodings.  The former is needed
  * for interoperability; the latter is needed to conform with the XML
  * spec.  This class also optimizes reading some common encodings by
  * providing low-overhead unsynchronized Reader support.
  * <p/>
  * <P> Note that the autodetection facility should be used only on
  * data streams which have an unknown character encoding.  For example,
  * it should never be used on MIME text/xml entities.
  * <p/>
  * <P> Note that XML processors are only required to support UTF-8 and
  * UTF-16 character encodings.  Autodetection permits the underlying Java
  * implementation to provide support for many other encodings, such as
  * US-ASCII, ISO-8859-5, Shift_JIS, EUC-JP, and ISO-2022-JP.
  *
  * @author David Brownell
  * @author Janet Koenig
  * @version 1.3 00/02/24
  */
 // package private
 final class XmlReader extends Reader {
     private static final int MAXPUSHBACK = 512;
     private Reader in;
     private String assignedEncoding;
     private boolean closed;
     //
     // This class always delegates I/O to a reader, which gets
     // its data from the very beginning of the XML text.  It needs
     // to use a pushback stream since (a) autodetection can read
     // partial UTF-8 characters which need to be fully processed,
     // (b) the "Unicode" readers swallow characters that they think
     // are byte order marks, so tests fail if they don't see the
     // real byte order mark.
     //
     // It's got do this efficiently:  character I/O is solidly on the
     // critical path.  (So keep buffer length over 2 Kbytes to avoid
     // excess buffering. Many URL handlers stuff a BufferedInputStream
     // between here and the real data source, and larger buffers keep
     // that from slowing you down.)
     //
     /**
      * Constructs the reader from an input stream, autodetecting
      * the encoding to use according to the heuristic specified
      * in the XML 1.0 recommendation.
      *
      * @param in the input stream from which the reader is constructed
      * @throws IOException on error, such as unrecognized encoding
      */
     public static Reader createReader(InputStream in) throws IOException {
         return new XmlReader(in);
     }
     /**
      * Creates a reader supporting the given encoding, mapping
      * from standard encoding names to ones that understood by
      * Java where necessary.
      *
      * @param in       the input stream from which the reader is constructed
      * @param encoding the IETF standard name of the encoding to use;
      *                 if null, autodetection is used.
      * @throws IOException on error, including unrecognized encoding
      */
     public static Reader createReader(InputStream in, String encoding)
             throws IOException {
         if (encoding == null)
             return new XmlReader(in);
         if ("UTF-8".equalsIgnoreCase(encoding)
                 || "UTF8".equalsIgnoreCase(encoding))
             return new Utf8Reader(in);
         if ("US-ASCII".equalsIgnoreCase(encoding)
                 || "ASCII".equalsIgnoreCase(encoding))
             return new AsciiReader(in);
         if ("ISO-8859-1".equalsIgnoreCase(encoding)
         // plus numerous aliases ...
         )
             return new Iso8859_1Reader(in);
         //
         // What we really want is an administerable resource mapping
         // encoding names/aliases to classnames.  For example a property
         // file resource, "readers/mapping.props", holding and a set
         // of readers in that (sub)package... defaulting to this call
         // only if no better choice is available.
         //
         return new InputStreamReader(in, std2java(encoding));
     }
     //
     // JDK doesn't know all of the standard encoding names, and
     // in particular none of the EBCDIC ones IANA defines (and
     // which IBM encourages).
     //
     static private final Hashtable charsets = new Hashtable(31);
     static {
         charsets.put("UTF-16", "Unicode");
         charsets.put("ISO-10646-UCS-2", "Unicode");
         // NOTE: no support for ISO-10646-UCS-4 yet.
         charsets.put("EBCDIC-CP-US", "cp037");
         charsets.put("EBCDIC-CP-CA", "cp037");
         charsets.put("EBCDIC-CP-NL", "cp037");
         charsets.put("EBCDIC-CP-WT", "cp037");
         charsets.put("EBCDIC-CP-DK", "cp277");
         charsets.put("EBCDIC-CP-NO", "cp277");
         charsets.put("EBCDIC-CP-FI", "cp278");
         charsets.put("EBCDIC-CP-SE", "cp278");
         charsets.put("EBCDIC-CP-IT", "cp280");
         charsets.put("EBCDIC-CP-ES", "cp284");
         charsets.put("EBCDIC-CP-GB", "cp285");
         charsets.put("EBCDIC-CP-FR", "cp297");
         charsets.put("EBCDIC-CP-AR1", "cp420");
         charsets.put("EBCDIC-CP-HE", "cp424");
         charsets.put("EBCDIC-CP-BE", "cp500");
         charsets.put("EBCDIC-CP-CH", "cp500");
         charsets.put("EBCDIC-CP-ROECE", "cp870");
         charsets.put("EBCDIC-CP-YU", "cp870");
         charsets.put("EBCDIC-CP-IS", "cp871");
         charsets.put("EBCDIC-CP-AR2", "cp918");
         // IANA also defines two that JDK 1.2 doesn't handle:
         //    EBCDIC-CP-GR        --> CP423
         //    EBCDIC-CP-TR        --> CP905
     }
     // returns an encoding name supported by JDK >= 1.1.6
     // for some cases required by the XML spec
     private static String std2java(String encoding) {
         String temp = encoding.toUpperCase();
         temp = (String) charsets.get(temp);
         return temp != null ? temp : encoding;
     }
     /**
      * Returns the standard name of the encoding in use
      */
     public String getEncoding() {
         return assignedEncoding;
     }
     private XmlReader(InputStream stream) throws IOException {
         super(stream);
         PushbackInputStream pb;
         byte buf [];
         int len;
         if (stream instanceof PushbackInputStream)
             pb = (PushbackInputStream) stream;
         else
             pb = new PushbackInputStream(stream, MAXPUSHBACK);
         //
         // See if we can figure out the character encoding used
         // in this file by peeking at the first few bytes.
         //
         buf = new byte[4];
         len = pb.read(buf);
         if (len > 0)
             pb.unread(buf, 0, len);
         if (len == 4)
             switch (buf[0] & 0x0ff) {
             case 0:
                 // 00 3c 00 3f == illegal UTF-16 big-endian
                 if (buf[1] == 0x3c && buf[2] == 0x00 && buf[3] == 0x3f) {
                     setEncoding(pb, "UnicodeBig");
                     return;
                 }
                 // else it's probably UCS-4
                 break;
             case '<':      // 0x3c: the most common cases!
                 switch (buf[1] & 0x0ff) {
                 // First character is '<'; could be XML without
                 // an XML directive such as "<hello>", "<!-- ...",
                 // and so on.
                 default:
                     break;
                     // 3c 00 3f 00 == illegal UTF-16 little endian
                 case 0x00:
                     if (buf[2] == 0x3f && buf[3] == 0x00) {
                         setEncoding(pb, "UnicodeLittle");
                         return;
                     }
                     // else probably UCS-4
                     break;
                     // 3c 3f 78 6d == ASCII and supersets '<?xm'
                 case '?':
                     if (buf[2] != 'x' || buf[3] != 'm')
                         break;
                     //
                     // One of several encodings could be used:
                     // Shift-JIS, ASCII, UTF-8, ISO-8859-*, etc
                     //
                     useEncodingDecl(pb, "UTF8");
                     return;
                 }
                 break;
                 // 4c 6f a7 94 ... some EBCDIC code page
             case 0x4c:
                 if (buf[1] == 0x6f
                         && (0x0ff & buf[2]) == 0x0a7
                         && (0x0ff & buf[3]) == 0x094) {
                     useEncodingDecl(pb, "CP037");
                     return;
                 }
                 // whoops, treat as UTF-8
                 break;
                 // UTF-16 big-endian
             case 0xfe:
                 if ((buf[1] & 0x0ff) != 0xff)
                     break;
                 setEncoding(pb, "UTF-16");
                 return;
                 // UTF-16 little-endian
             case 0xff:
                 if ((buf[1] & 0x0ff) != 0xfe)
                     break;
                 setEncoding(pb, "UTF-16");
                 return;
                 // default ... no XML declaration
             default:
                 break;
             }
         //
         // If all else fails, assume XML without a declaration, and
         // using UTF-8 encoding.
         //
         setEncoding(pb, "UTF-8");
     }
     /*
      * Read the encoding decl on the stream, knowing that it should
      * be readable using the specified encoding (basically, ASCII or
      * EBCDIC).  The body of the document may use a wider range of
      * characters than the XML/Text decl itself, so we switch to use
      * the specified encoding as soon as we can.  (ASCII is a subset
      * of UTF-8, ISO-8859-*, ISO-2022-JP, EUC-JP, and more; EBCDIC
      * has a variety of "code pages" that have these characters as
      * a common subset.)
      */
     private void useEncodingDecl(PushbackInputStream pb, String encoding)
             throws IOException {
         byte buffer [] = new byte[MAXPUSHBACK];
         int len;
         Reader r;
         int c;
         //
         // Buffer up a bunch of input, and set up to read it in
         // the specified encoding ... we can skip the first four
         // bytes since we know that "<?xm" was read to determine
         // what encoding to use!
         //
         len = pb.read(buffer, 0, buffer.length);
         pb.unread(buffer, 0, len);
         r = new InputStreamReader(new ByteArrayInputStream(buffer, 4, len),
                 encoding);
         //
         // Next must be "l" (and whitespace) else we conclude
         // error and choose UTF-8.
         //
         if ((c = r.read()) != 'l') {
             setEncoding(pb, "UTF-8");
             return;
         }
         //
         // Then, we'll skip any
         //     S version="..."     [or single quotes]
         // bit and get any subsequent
         //     S encoding="..."     [or single quotes]
         //
         // We put an arbitrary size limit on how far we read; lots
         // of space will break this algorithm.
         //
         StringBuffer buf = new StringBuffer();
         StringBuffer keyBuf = null;
         String key = null;
         boolean sawEq = false;
         char quoteChar = 0;
         boolean sawQuestion = false;
         XmlDecl:
         for (int i = 0; i < MAXPUSHBACK - 5; ++i) {
             if ((c = r.read()) == -1)
                 break;
             // ignore whitespace before/between "key = 'value'"
             if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
                 continue;
             // ... but require at least a little!
             if (i == 0)
                 break;
             // terminate the loop ASAP
             if (c == '?')
                 sawQuestion = true;
             else if (sawQuestion) {
                 if (c == '>')
                     break;
                 sawQuestion = false;
             }
             // did we get the "key =" bit yet?
             if (key == null || !sawEq) {
                 if (keyBuf == null) {
                     if (Character.isWhitespace((char) c))
                         continue;
                     keyBuf = buf;
                     buf.setLength(0);
                     buf.append((char) c);
                     sawEq = false;
                 } else if (Character.isWhitespace((char) c)) {
                     key = keyBuf.toString();
                 } else if (c == '=') {
                     if (key == null)
                         key = keyBuf.toString();
                     sawEq = true;
                     keyBuf = null;
                     quoteChar = 0;
                 } else
                     keyBuf.append((char) c);
                 continue;
             }
             // space before quoted value
             if (Character.isWhitespace((char) c))
                 continue;
             if (c == '"' || c == '\'') {
                 if (quoteChar == 0) {
                     quoteChar = (char) c;
                     buf.setLength(0);
                     continue;
                 } else if (c == quoteChar) {
                     if ("encoding".equals(key)) {
                         assignedEncoding = buf.toString();
                         // [81] Encname ::= [A-Za-z] ([A-Za-z0-9._]|'-')*
                         for (i = 0; i < assignedEncoding.length(); i++) {
                             c = assignedEncoding.charAt(i);
                             if ((c >= 'A' && c <= 'Z')
                                     || (c >= 'a' && c <= 'z'))
                                 continue;
                             if (i == 0)
                                 break XmlDecl;
                             if (i > 0 && (c == '-'
                                     || (c >= '0' && c <= '9')
                                     || c == '.' || c == '_'))
                                 continue;
                             // map illegal names to UTF-8 default
                             break XmlDecl;
                         }
                         setEncoding(pb, assignedEncoding);
                         return;
                     } else {
                         key = null;
                         continue;
                     }
                 }
             }
             buf.append((char) c);
         }
         setEncoding(pb, "UTF-8");
     }
     private void setEncoding(InputStream stream, String encoding)
             throws IOException {
         assignedEncoding = encoding;
         in = createReader(stream, encoding);
     }
     /**
      * Reads the number of characters read into the buffer, or -1 on EOF.
      */
     public int read(char buf [], int off, int len) throws IOException {
         int val;
         if (closed)
             return -1;        // throw new IOException ("closed");
         val = in.read(buf, off, len);
         if (val == -1)
             close();
         return val;
     }
     /**
      * Reads a single character.
      */
     public int read() throws IOException {
         int val;
         if (closed)
             throw new IOException("closed");
         val = in.read();
         if (val == -1)
             close();
         return val;
     }
     /**
      * Returns true iff the reader supports mark/reset.
      */
     public boolean markSupported() {
         return in == null ? false : in.markSupported();
     }
     /**
      * Sets a mark allowing a limited number of characters to
      * be "peeked", by reading and then resetting.
      *
      * @param value how many characters may be "peeked".
      */
     public void mark(int value) throws IOException {
         if (in != null) in.mark(value);
     }
     /**
      * Resets the current position to the last marked position.
      */
     public void reset() throws IOException {
         if (in != null) in.reset();
     }
     /**
      * Skips a specified number of characters.
      */
     public long skip(long value) throws IOException {
         return in == null ? 0 : in.skip(value);
     }
     /**
      * Returns true iff input characters are known to be ready.
      */
     public boolean ready() throws IOException {
         return in == null ? false : in.ready();
     }
     /**
      * Closes the reader.
      */
     public void close() throws IOException {
         if (closed)
             return;
         in.close();
         in = null;
         closed = true;
     }
     //
     // Delegating to a converter module will always be slower than
     // direct conversion.  Use a similar approach for any other
     // readers that need to be particularly fast; only block I/O
     // speed matters to this package.  For UTF-16, separate readers
     // for big and little endian streams make a difference, too;
     // fewer conditionals in the critical path!
     //
     static abstract class BaseReader extends Reader {
         protected InputStream instream;
         protected byte buffer [];
         protected int start, finish;
         BaseReader(InputStream stream) {
             super(stream);
             instream = stream;
             buffer = new byte[8192];
         }
         public boolean ready() throws IOException {
             return instream == null
                     || (finish - start) > 0
                     || instream.available() != 0;
         }
         // caller shouldn't read again
         public void close() throws IOException {
             if (instream != null) {
                 instream.close();
                 start = finish = 0;
                 buffer = null;
                 instream = null;
             }
         }
     }
     //
     // We want this reader, to make the default encoding be as fast
     // as we can make it.  JDK's "UTF8" (not "UTF-8" till JDK 1.2)
     // InputStreamReader works, but 20+% slower speed isn't OK for
     // the default/primary encoding.
     //
     static final class Utf8Reader extends BaseReader {
         // 2nd half of UTF-8 surrogate pair
         private char nextChar;
         Utf8Reader(InputStream stream) {
             super(stream);
         }
         public int read(char buf [], int offset, int len) throws IOException {
             int i = 0, c = 0;
             if (len <= 0)
                 return 0;
             // Consume remaining half of any surrogate pair immediately
             if (nextChar != 0) {
                 buf[offset + i++] = nextChar;
                 nextChar = 0;
             }
             while (i < len) {
                 // stop or read data if needed
                 if (finish <= start) {
                     if (instream == null) {
                         c = -1;
                         break;
                     }
                     start = 0;
                     finish = instream.read(buffer, 0, buffer.length);
                     if (finish <= 0) {
                         this.close();
                         c = -1;
                         break;
                     }
                 }
                 //
                 // RFC 2279 describes UTF-8; there are six encodings.
                 // Each encoding takes a fixed number of characters
                 // (1-6 bytes) and is flagged by a bit pattern in the
                 // first byte.  The five and six byte-per-character
                 // encodings address characters which are disallowed
                 // in XML documents, as do some four byte ones.
                 //
                 //
                 // Single byte == ASCII.  Common; optimize.
                 //
                 c = buffer[start] & 0x0ff;
                 if ((c & 0x80) == 0x00) {
                     // 0x0000 <= c <= 0x007f
                     start++;
                     buf[offset + i++] = (char) c;
                     continue;
                 }
                 //
                 // Multibyte chars -- check offsets optimistically,
                 // ditto the "10xx xxxx" format for subsequent bytes
                 //
                 int off = start;
                 try {
                     // 2 bytes
                     if ((buffer[off] & 0x0E0) == 0x0C0) {
                         c = (buffer[off++] & 0x1f) << 6;
                         c += buffer[off++] & 0x3f;
                         // 0x0080 <= c <= 0x07ff
                         // 3 bytes
                     } else if ((buffer[off] & 0x0F0) == 0x0E0) {
                         c = (buffer[off++] & 0x0f) << 12;
                         c += (buffer[off++] & 0x3f) << 6;
                         c += buffer[off++] & 0x3f;
                         // 0x0800 <= c <= 0xffff
                         // 4 bytes
                     } else if ((buffer[off] & 0x0f8) == 0x0F0) {
                         c = (buffer[off++] & 0x07) << 18;
                         c += (buffer[off++] & 0x3f) << 12;
                         c += (buffer[off++] & 0x3f) << 6;
                         c += buffer[off++] & 0x3f;
                         // 0x0001 0000  <= c  <= 0x001f ffff
                         // Unicode supports c <= 0x0010 ffff ...
                         if (c > 0x0010ffff)
                             throw new CharConversionException("UTF-8 encoding of character 0x00"
                                     + Integer.toHexString(c)
                                     + " can't be converted to Unicode.");
                         // Convert UCS-4 char to surrogate pair (UTF-16)
                         c -= 0x10000;
                         nextChar = (char) (0xDC00 + (c & 0x03ff));
                         c = 0xD800 + (c >> 10);
                         // 5 and 6 byte versions are XML WF errors, but
                         // typically come from mislabeled encodings
                     } else
                         throw new CharConversionException("Unconvertible UTF-8 character"
                                 + " beginning with 0x"
                                 + Integer.toHexString(buffer[start] & 0xff));
                 } catch (ArrayIndexOutOfBoundsException e) {
                     // off > length && length >= buffer.length
                     c = 0;
                 }
                 //
                 // if the buffer held only a partial character,
                 // compact it and try to read the rest of the
                 // character.  worst case involves three
                 // single-byte reads -- quite rare.
                 //
                 if (off > finish) {
                     System.arraycopy(buffer, start,
                             buffer, 0, finish - start);
                     finish -= start;
                     start = 0;
                     off = instream.read(buffer, finish,
                             buffer.length - finish);
                     if (off < 0) {
                         this.close();
                         throw new CharConversionException("Partial UTF-8 char");
                     }
                     finish += off;
                     continue;
                 }
                 //
                 // check the format of the non-initial bytes
                 //
                 for (start++; start < off; start++) {
                     if ((buffer[start] & 0xC0) != 0x80) {
                         this.close();
                         throw new CharConversionException("Malformed UTF-8 char -- "
                                 + "is an XML encoding declaration missing?");
                     }
                 }
                 //
                 // If this needed a surrogate pair, consume ASAP
                 //
                 buf[offset + i++] = (char) c;
                 if (nextChar != 0 && i < len) {
                     buf[offset + i++] = nextChar;
                     nextChar = 0;
                 }
             }
             if (i > 0)
                 return i;
             return (c == -1) ? -1 : 0;
         }
     }
     //
     // We want ASCII and ISO-8859 Readers since they're the most common
     // encodings in the US and Europe, and we don't want performance
     // regressions for them.  They're also easy to implement efficiently,
     // since they're bitmask subsets of UNICODE.
     //
     // XXX haven't benchmarked these readers vs what we get out of JDK.
     //
     static final class AsciiReader extends BaseReader {
         AsciiReader(InputStream in) {
             super(in);
         }
         public int read(char buf [], int offset, int len) throws IOException {
             int i, c;
             if (instream == null)
                 return -1;
             for (i = 0; i < len; i++) {
                 if (start >= finish) {
                     start = 0;
                     finish = instream.read(buffer, 0, buffer.length);
                     if (finish <= 0) {
                         if (finish <= 0)
                             this.close();
                         break;
                     }
                 }
                 c = buffer[start++];
                 if ((c & 0x80) != 0)
                     throw new CharConversionException("Illegal ASCII character, 0x"
                             + Integer.toHexString(c & 0xff));
                 buf[offset + i] = (char) c;
             }
             if (i == 0 && finish <= 0)
                 return -1;
             return i;
         }
     }
     static final class Iso8859_1Reader extends BaseReader {
         Iso8859_1Reader(InputStream in) {
             super(in);
         }
         public int read(char buf [], int offset, int len) throws IOException {
             int i;
             if (instream == null)
                 return -1;
             for (i = 0; i < len; i++) {
                 if (start >= finish) {
                     start = 0;
                     finish = instream.read(buffer, 0, buffer.length);
                     if (finish <= 0) {
                         if (finish <= 0)
                             this.close();
                         break;
                     }
                 }
                 buf[offset + i] = (char) (0x0ff & buffer[start++]);
             }
             if (i == 0 && finish <= 0)
                 return -1;
             return i;
         }
     }
 }

Mercurial > jdk8-mips64-public > jaxws / annotate

src/share/jaxws_classes/com/sun/xml/internal/dtdparser/XmlReader.java@e530533619ec (annotated)

src/share/jaxws_classes/com/sun/xml/internal/dtdparser/XmlReader.java