| /**************************************************************** |
| * 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.james.mime4j.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.CharacterCodingException; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetEncoder; |
| import java.nio.charset.CoderResult; |
| import java.nio.charset.CodingErrorAction; |
| |
| /** |
| * {@link InputStream} backed by {@link CharSequence}. |
| */ |
| class TextInputStream extends InputStream { |
| |
| private final CharsetEncoder encoder; |
| private final CharBuffer cbuf; |
| private final ByteBuffer bbuf; |
| |
| private int mark = -1; |
| |
| TextInputStream(final CharSequence s, final Charset charset, int bufferSize) { |
| super(); |
| this.encoder = charset.newEncoder() |
| .onMalformedInput(CodingErrorAction.REPLACE) |
| .onUnmappableCharacter(CodingErrorAction.REPLACE); |
| this.bbuf = ByteBuffer.allocate(bufferSize); |
| this.bbuf.flip(); |
| this.cbuf = CharBuffer.wrap(s); |
| } |
| |
| private void fillBuffer() throws CharacterCodingException { |
| this.bbuf.compact(); |
| CoderResult result = this.encoder.encode(this.cbuf, this.bbuf, true); |
| if (result.isError()) { |
| result.throwException(); |
| } |
| this.bbuf.flip(); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| if (b == null) { |
| throw new NullPointerException(); |
| } |
| if (off < 0 || len < 0 || off + len > b.length) { |
| throw new IndexOutOfBoundsException(); |
| } |
| if (!this.bbuf.hasRemaining() && !this.cbuf.hasRemaining()) { |
| return -1; |
| } |
| int bytesRead = 0; |
| while (len > 0) { |
| if (this.bbuf.hasRemaining()) { |
| int chunk = Math.min(this.bbuf.remaining(), len); |
| this.bbuf.get(b, off, chunk); |
| off += chunk; |
| len -= chunk; |
| bytesRead += chunk; |
| } else { |
| fillBuffer(); |
| if (!this.bbuf.hasRemaining() && !this.cbuf.hasRemaining()) { |
| break; |
| } |
| } |
| } |
| if (bytesRead > 0) { |
| return bytesRead; |
| } else { |
| if (!this.bbuf.hasRemaining() && !this.cbuf.hasRemaining()) { |
| return -1; |
| } else { |
| return bytesRead; |
| } |
| } |
| } |
| |
| @Override |
| public int read() throws IOException { |
| for (;;) { |
| if (this.bbuf.hasRemaining()) { |
| return this.bbuf.get() & 0xFF; |
| } else { |
| fillBuffer(); |
| if (!this.bbuf.hasRemaining() && !this.cbuf.hasRemaining()) { |
| return -1; |
| } |
| } |
| } |
| } |
| |
| @Override |
| public int read(byte[] b) throws IOException { |
| return read(b, 0, b.length); |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| int skipped = 0; |
| while (n > 0 && this.cbuf.hasRemaining()) { |
| this.cbuf.get(); |
| n--; |
| skipped++; |
| } |
| return skipped; |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return this.cbuf.remaining(); |
| } |
| |
| @Override |
| public void mark(int readlimit) { |
| this.mark = this.cbuf.position(); |
| } |
| |
| @Override |
| public void reset() throws IOException { |
| if (this.mark != -1) { |
| this.cbuf.position(this.mark); |
| this.mark = -1; |
| } |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return true; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| } |
| |
| } |