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Diffstat (limited to 'libjava/classpath/gnu/xml/dom/ls/ReaderInputStream.java')
| -rw-r--r-- | libjava/classpath/gnu/xml/dom/ls/ReaderInputStream.java | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/dom/ls/ReaderInputStream.java b/libjava/classpath/gnu/xml/dom/ls/ReaderInputStream.java new file mode 100644 index 000000000..cf279ab39 --- /dev/null +++ b/libjava/classpath/gnu/xml/dom/ls/ReaderInputStream.java @@ -0,0 +1,236 @@ +/* ReaderInputStream.java -- + Copyright (C) 1999, 2000, 2001, 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.xml.dom.ls; + +import java.io.InputStream; +import java.io.IOException; +import java.io.Reader; + +/** + * Character stream wrapper. + * + * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> + * @author <a href='mailto:mark@klomp.org'>Mark Wielaard</a> + */ +public class ReaderInputStream + extends InputStream +{ + + private Reader reader; + private String encoding; + + // Holds extra spillover data if necessary + private byte extra[]; + private int pos; + + private byte extra_marked[]; + private int pos_marked; + + public ReaderInputStream(Reader reader) + { + this.reader = reader; + this.encoding = "UTF-8"; + } + + void setEncoding(String encoding) + { + this.encoding = encoding; + } + + public int read() + throws IOException + { + if (extra != null) + { + int result = extra[pos]; + pos++; + if (pos >= extra.length) + { + extra = null; + } + return result; + } + return reader.read(); + } + + public int read(byte[] b) + throws IOException + { + return read(b, 0, b.length); + } + + public int read(byte[] b, int off, int len) + throws IOException + { + if (len == 0) + { + return 0; + } + + if (extra != null) + { + int available = extra.length - pos; + int l = available < len ? available : len; + System.arraycopy(extra, 0, b, off, l); + pos += l; + if (pos >= extra.length) + { + extra = null; + } + return l; + } + + char[] c = new char[len]; + int l = reader.read(c, 0, len); + if (l == -1) + { + return -1; + } + + String s = new String(c, 0, l); + byte[] d = s.getBytes(encoding); + + int available = d.length; + int more = d.length - len; + if (more > 0) + { + extra = new byte[more]; + pos = 0; + System.arraycopy(d, len, extra, 0, more); + available -= more; + } + + System.arraycopy(d, 0, b, off, available); + return available; + } + + public void close() + throws IOException + { + reader.close(); + } + + public boolean markSupported() + { + return reader.markSupported(); + } + + public void mark(int limit) + { + if (extra != null) + { + extra_marked = new byte[extra.length]; + System.arraycopy(extra, 0, extra_marked, 0, extra.length); + pos_marked = pos; + } + else + { + extra_marked = null; + } + + try + { + // Note that this might be a bit more than asked for. + // Because we might also have the extra_marked bytes. + // That is fine (and necessary for reset() to work). + reader.mark(limit); + } + catch (IOException ioe) + { + throw new RuntimeException(ioe); + } + } + + public void reset() + throws IOException + { + extra = extra_marked; + pos = pos_marked; + extra_marked = null; + + reader.reset(); + } + + public long skip(long n) + throws IOException + { + long done = 0; + if (extra != null) + { + int available = extra.length - pos; + done = available < n ? available : n; + pos += done; + if (pos >= extra.length) + { + extra = null; + } + } + + n -= done; + if (n > 0) + { + return reader.skip(n) + done; + } + else + { + return done; + } + } + + /** + * Returns conservative number of bytes available without blocking. + * Actual number of bytes that can be read without blocking might + * be (much) bigger. + */ + public int available() + throws IOException + { + if (extra != null) + { + return pos - extra.length; + } + + return reader.ready() ? 1 : 0; + } + + public String toString() + { + return getClass().getName() + "[" + reader + ", " + encoding + "]"; + } + +} |