| /* |
| * Copyright (c) 1997, 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. |
| * |
| * 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. |
| */ |
| |
| /**/ |
| |
| import java.io.*; |
| |
| |
| public class ABCInputStream extends InputStream { |
| |
| int len; |
| int chunk; |
| int count = 0; |
| char next = firstChar(); |
| |
| ABCInputStream(int len) { |
| this(len, len); |
| } |
| |
| ABCInputStream(int len, int chunk) { |
| this.len = len; |
| this.chunk = chunk; |
| } |
| |
| static char firstChar() { |
| return 'a'; |
| } |
| |
| static char nextChar(char c) { |
| if (c == 'z') |
| return '0'; |
| else if (c == '9') |
| return 'a'; |
| else |
| return (char)(c + 1); |
| } |
| |
| public int read() { |
| if (count >= len) |
| return -1; |
| char c = next; |
| next = nextChar(c); |
| count++; |
| return (byte) c; |
| } |
| |
| public int read(byte buf[], int off, int len) { |
| int n = (len > chunk) ? chunk : len; |
| for (int i = off; i < off + n; i++) { |
| int c = read(); |
| if (c == -1) { |
| if (i > off) |
| return i - off; |
| else |
| return -1; |
| } |
| buf[i] = (byte) c; |
| } |
| return n; |
| } |
| |
| public int available() { |
| int remaining = len - count; |
| return (remaining > chunk) ? chunk : remaining; |
| } |
| |
| public void close() throws IOException { |
| if (len == 0) |
| throw new IOException("Already closed"); |
| len = 0; |
| } |
| |
| } |