001: package com.quadcap.io;
002:
003: /* Copyright 1997 - 2003 Quadcap Software. All rights reserved.
004: *
005: * This software is distributed under the Quadcap Free Software License.
006: * This software may be used or modified for any purpose, personal or
007: * commercial. Open Source redistributions are permitted. Commercial
008: * redistribution of larger works derived from, or works which bundle
009: * this software requires a "Commercial Redistribution License"; see
010: * http://www.quadcap.com/purchase.
011: *
012: * Redistributions qualify as "Open Source" under one of the following terms:
013: *
014: * Redistributions are made at no charge beyond the reasonable cost of
015: * materials and delivery.
016: *
017: * Redistributions are accompanied by a copy of the Source Code or by an
018: * irrevocable offer to provide a copy of the Source Code for up to three
019: * years at the cost of materials and delivery. Such redistributions
020: * must allow further use, modification, and redistribution of the Source
021: * Code under substantially the same terms as this license.
022: *
023: * Redistributions of source code must retain the copyright notices as they
024: * appear in each source code file, these license terms, and the
025: * disclaimer/limitation of liability set forth as paragraph 6 below.
026: *
027: * Redistributions in binary form must reproduce this Copyright Notice,
028: * these license terms, and the disclaimer/limitation of liability set
029: * forth as paragraph 6 below, in the documentation and/or other materials
030: * provided with the distribution.
031: *
032: * The Software is provided on an "AS IS" basis. No warranty is
033: * provided that the Software is free of defects, or fit for a
034: * particular purpose.
035: *
036: * Limitation of Liability. Quadcap Software shall not be liable
037: * for any damages suffered by the Licensee or any third party resulting
038: * from use of the Software.
039: */
040:
041: import java.io.InputStream;
042: import java.io.IOException;
043:
044: import java.util.Vector;
045:
046: import com.quadcap.util.Debug;
047:
048: /**
049: * This class implements an input stream filter which keeps track of how
050: * many bytes have been read.
051: *
052: * @author Stan Bailes
053: */
054: public class CountedInputStream extends InputStream {
055: InputStream in;
056: int pos = 0;
057:
058: /**
059: * Construct a new CountedInputStream reading from the specified base
060: * stream.
061: *
062: * @param in the input stream
063: */
064: public CountedInputStream(InputStream in) {
065: this .in = in;
066: }
067:
068: /**
069: * Read the next byte from this input stream.
070: *
071: * @exception IOException if an I/O error occurs.
072: */
073: public int read() throws IOException {
074: pos++;
075: return in.read();
076: }
077:
078: /**
079: * Read a block of bytes from this input stream.
080: *
081: * @exception IOException if an I/O error occcurs.
082: */
083: public int read(byte[] buf, int offset, int cnt) throws IOException {
084: int ret = in.read(buf, offset, cnt);
085: pos += ret;
086: return ret;
087: }
088:
089: /**
090: * Read a block of bytes from this input stream.
091: *
092: * @exception IOException if an I/O error occcurs.
093: */
094: public int read(byte[] buf) throws IOException {
095: int ret = in.read(buf);
096: pos += ret;
097: return ret;
098: }
099:
100: /**
101: * Return the number of bytes that can be read without blocking.
102: */
103: public int available() throws IOException {
104: return in.available();
105: }
106:
107: /**
108: * Close the stream.
109: */
110: public void close() throws IOException {
111: in.close();
112: }
113:
114: /**
115: * Skip ahead in the stream.
116: */
117: public long skip(long n) throws IOException {
118: return in.skip(n);
119: }
120:
121: /**
122: * Mark the current position in the input stream.
123: */
124: public void mark(int readLimit) {
125: in.mark(readLimit);
126: }
127:
128: /**
129: * Return to the previously marked position in the input stream.
130: */
131: public void reset() throws IOException {
132: in.reset();
133: }
134:
135: /**
136: * Return true if mark/reset supported (they are.)
137: */
138: public boolean markSupported() {
139: return in.markSupported();
140: }
141:
142: /**
143: * Return the number of bytes read so far from this input stream.
144: */
145: public int getPosition() {
146: return pos;
147: }
148:
149: /**
150: * Set the current position
151: */
152: public void setPosition(int pos) {
153: this.pos = pos;
154: }
155:
156: }
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