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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/xml/stream/BufferedReader.java | |
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Diffstat (limited to 'libjava/classpath/gnu/xml/stream/BufferedReader.java')
-rw-r--r-- | libjava/classpath/gnu/xml/stream/BufferedReader.java | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/stream/BufferedReader.java b/libjava/classpath/gnu/xml/stream/BufferedReader.java new file mode 100644 index 000000000..dc69fb34b --- /dev/null +++ b/libjava/classpath/gnu/xml/stream/BufferedReader.java @@ -0,0 +1,198 @@ +/* BufferedReader.java -- + Copyright (C) 2005 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.stream; + +import java.io.IOException; +import java.io.Reader; + +/** + * A mark-capable buffered reader. + * + * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> + */ +class BufferedReader + extends Reader +{ + + static final int DEFAULT_BUFFER_SIZE = 4096; + + final Reader in; + char[] buf; + int pos, count, markpos, marklimit, bufferSize; + + BufferedReader(Reader in) + { + this(in, DEFAULT_BUFFER_SIZE); + } + + BufferedReader(Reader in, int bufferSize) + { + if (bufferSize < 1) + throw new IllegalArgumentException(); + this.in = in; + this.bufferSize = bufferSize; + buf = new char[bufferSize]; + pos = count = bufferSize; + } + + public void close() + throws IOException + { + buf = null; + pos = count = 0; + markpos = -1; + in.close(); + } + + public void mark(int readlimit) + throws IOException + { + marklimit = readlimit; + markpos = pos; + } + + public boolean markSupported() + { + return true; + } + + public int read() + throws IOException + { + if (pos >= count && !refill()) + return -1; + return (int) buf[pos++]; + } + + public int read(char[] b) + throws IOException + { + return read(b, 0, b.length); + } + + public int read(char[] b, int off, int len) + throws IOException + { + if (off < 0 || len < 0 || b.length - off < len) + throw new IndexOutOfBoundsException(); + + if (len == 0) + return 0; + + if (pos >= count && !refill()) + return -1; + + int ret = Math.min(count - pos, len); + System.arraycopy(buf, pos, b, off, ret); + pos += ret; + off += ret; + len -= ret; + + while (len > 0 && refill()) + { + int remain = Math.min(count - pos, len); + System.arraycopy(buf, pos, b, off, remain); + pos += remain; + off += remain; + len -= remain; + ret += remain; + } + + return ret; + } + + public void reset() + throws IOException + { + if (markpos == -1) + throw new IOException(buf == null ? "Stream closed." : "Invalid mark."); + pos = markpos; + } + + public long skip(long n) + throws IOException + { + if (buf == null) + throw new IOException("Stream closed."); + final long origN = n; + while (n > 0L) + { + if (pos >= count && !refill()) + break; + int numread = (int) Math.min((long) (count - pos), n); + pos += numread; + n -= numread; + } + return origN - n; + } + + private boolean refill() + throws IOException + { + if (buf == null) + throw new IOException("Stream closed."); + + int markcount = count - markpos; + if (markpos == -1 || markcount >= marklimit) + { + markpos = -1; + pos = count = 0; + } + else + { + char[] newbuf = buf; + if (markpos < bufferSize) + { + newbuf = new char[count - markpos + bufferSize]; + } + System.arraycopy(buf, markpos, newbuf, 0, markcount); + buf = newbuf; + count = markcount; + pos -= markpos; + markpos = 0; + } + + int numread = in.read(buf, count, bufferSize); + if (numread <= 0) + return false; + + count += numread; + return true; + } + +} |