94 lines
2.4 KiB
Java
94 lines
2.4 KiB
Java
/*
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* Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**/
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import java.io.*;
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public class ABCInputStream extends InputStream {
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int len;
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int chunk;
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int count = 0;
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char next = firstChar();
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ABCInputStream(int len) {
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this(len, len);
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}
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ABCInputStream(int len, int chunk) {
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this.len = len;
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this.chunk = chunk;
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}
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static char firstChar() {
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return 'a';
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}
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static char nextChar(char c) {
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if (c == 'z')
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return '0';
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else if (c == '9')
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return 'a';
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else
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return (char)(c + 1);
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}
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public int read() {
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if (count >= len)
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return -1;
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char c = next;
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next = nextChar(c);
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count++;
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return (byte) c;
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}
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public int read(byte buf[], int off, int len) {
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int n = (len > chunk) ? chunk : len;
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for (int i = off; i < off + n; i++) {
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int c = read();
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if (c == -1) {
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if (i > off)
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return i - off;
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else
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return -1;
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}
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buf[i] = (byte) c;
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}
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return n;
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}
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public int available() {
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int remaining = len - count;
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return (remaining > chunk) ? chunk : remaining;
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}
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public void close() throws IOException {
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if (len == 0)
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throw new IOException("Already closed");
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len = 0;
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}
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}
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