diff options
| author | Joe Robinson <joe@lc8n.com> | 2010-10-27 21:31:44 +0100 |
|---|---|---|
| committer | Joe Robinson <joe@lc8n.com> | 2010-10-27 21:31:44 +0100 |
| commit | 01c75a7aa09d0d9fd7a4c61f952aaa93972e7c99 (patch) | |
| tree | 9f5ea5af583c0e082d7f5a5dbd30c644ad6b6166 /src/org/apache/commons/net/io/ToNetASCIIInputStream.java | |
Reset eclipse workspace (commit hopefully changes nothing)
Diffstat (limited to 'src/org/apache/commons/net/io/ToNetASCIIInputStream.java')
| -rw-r--r-- | src/org/apache/commons/net/io/ToNetASCIIInputStream.java | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/src/org/apache/commons/net/io/ToNetASCIIInputStream.java b/src/org/apache/commons/net/io/ToNetASCIIInputStream.java new file mode 100644 index 0000000..55e4735 --- /dev/null +++ b/src/org/apache/commons/net/io/ToNetASCIIInputStream.java @@ -0,0 +1,181 @@ +/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.net.io;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/***
+ * This class wraps an input stream, replacing all singly occurring
+ * <LF> (linefeed) characters with <CR><LF> (carriage return
+ * followed by linefeed), which is the NETASCII standard for representing
+ * a newline.
+ * You would use this class to implement ASCII file transfers requiring
+ * conversion to NETASCII.
+ * <p>
+ * <p>
+ * @author Daniel F. Savarese
+ ***/
+
+public final class ToNetASCIIInputStream extends FilterInputStream
+{
+ private static final int __NOTHING_SPECIAL = 0;
+ private static final int __LAST_WAS_CR = 1;
+ private static final int __LAST_WAS_NL = 2;
+ private int __status;
+
+ /***
+ * Creates a ToNetASCIIInputStream instance that wraps an existing
+ * InputStream.
+ * <p>
+ * @param input The InputStream to .
+ ***/
+ public ToNetASCIIInputStream(InputStream input)
+ {
+ super(input);
+ __status = __NOTHING_SPECIAL;
+ }
+
+
+ /***
+ * Reads and returns the next byte in the stream. If the end of the
+ * message has been reached, returns -1.
+ * <p>
+ * @return The next character in the stream. Returns -1 if the end of the
+ * stream has been reached.
+ * @exception IOException If an error occurs while reading the underlying
+ * stream.
+ ***/
+ @Override
+ public int read() throws IOException
+ {
+ int ch;
+
+ if (__status == __LAST_WAS_NL)
+ {
+ __status = __NOTHING_SPECIAL;
+ return '\n';
+ }
+
+ ch = in.read();
+
+ switch (ch)
+ {
+ case '\r':
+ __status = __LAST_WAS_CR;
+ return '\r';
+ case '\n':
+ if (__status != __LAST_WAS_CR)
+ {
+ __status = __LAST_WAS_NL;
+ return '\r';
+ }
+ // else fall through
+ default:
+ __status = __NOTHING_SPECIAL;
+ return ch;
+ }
+ // statement not reached
+ //return ch;
+ }
+
+
+ /***
+ * Reads the next number of bytes from the stream into an array and
+ * returns the number of bytes read. Returns -1 if the end of the
+ * stream has been reached.
+ * <p>
+ * @param buffer The byte array in which to store the data.
+ * @return The number of bytes read. Returns -1 if the
+ * end of the message has been reached.
+ * @exception IOException If an error occurs in reading the underlying
+ * stream.
+ ***/
+ @Override
+ public int read(byte buffer[]) throws IOException
+ {
+ return read(buffer, 0, buffer.length);
+ }
+
+
+ /***
+ * Reads the next number of bytes from the stream into an array and returns
+ * the number of bytes read. Returns -1 if the end of the
+ * message has been reached. The characters are stored in the array
+ * starting from the given offset and up to the length specified.
+ * <p>
+ * @param buffer The byte array in which to store the data.
+ * @param offset The offset into the array at which to start storing data.
+ * @param length The number of bytes to read.
+ * @return The number of bytes read. Returns -1 if the
+ * end of the stream has been reached.
+ * @exception IOException If an error occurs while reading the underlying
+ * stream.
+ ***/
+ @Override
+ public int read(byte buffer[], int offset, int length) throws IOException
+ {
+ int ch, off;
+
+ if (length < 1)
+ return 0;
+
+ ch = available();
+
+ if (length > ch)
+ length = ch;
+
+ // If nothing is available, block to read only one character
+ if (length < 1)
+ length = 1;
+
+ if ((ch = read()) == -1)
+ return -1;
+
+ off = offset;
+
+ do
+ {
+ buffer[offset++] = (byte)ch;
+ }
+ while (--length > 0 && (ch = read()) != -1);
+
+ return (offset - off);
+ }
+
+ /*** Returns false. Mark is not supported. ***/
+ @Override
+ public boolean markSupported()
+ {
+ return false;
+ }
+
+ @Override
+ public int available() throws IOException
+ {
+ int result;
+
+ result = in.available();
+
+ if (__status == __LAST_WAS_NL)
+ return (result + 1);
+
+ return result;
+ }
+}
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