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/*
* 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 com.android.camera;
/*
* This file derives from the Apache version of the BufferedInputStream.
* Mods to support passing in the buffer rather than creating one directly.
*/
import java.io.InputStream;
import java.io.FilterInputStream;
import java.io.IOException;
public class BufferedInputStream extends FilterInputStream {
protected byte[] buf;
protected int count;
protected int marklimit;
protected int markpos = -1;
protected int pos;
private boolean closed = false;
public BufferedInputStream(InputStream in, byte [] buffer) {
super(in);
buf = buffer;
if (buf == null) {
throw new java.security.InvalidParameterException();
}
}
@Override
public synchronized int available() throws IOException {
return count - pos + in.available();
}
@Override
public synchronized void close() throws IOException {
if (null != in) {
super.close();
in = null;
}
buf = null;
closed = true;
}
private int fillbuf() throws IOException {
if (markpos == -1 || (pos - markpos >= marklimit)) {
/* Mark position not set or exceeded readlimit */
int result = in.read(buf);
if (result > 0) {
markpos = -1;
pos = 0;
count = result == -1 ? 0 : result;
}
return result;
}
if (markpos == 0 && marklimit > buf.length) {
/* Increase buffer size to accomodate the readlimit */
int newLength = buf.length * 2;
if (newLength > marklimit) {
newLength = marklimit;
}
byte[] newbuf = new byte[newLength];
System.arraycopy(buf, 0, newbuf, 0, buf.length);
buf = newbuf;
} else if (markpos > 0) {
System.arraycopy(buf, markpos, buf, 0, buf.length - markpos);
}
/* Set the new position and mark position */
pos -= markpos;
count = markpos = 0;
int bytesread = in.read(buf, pos, buf.length - pos);
count = bytesread <= 0 ? pos : pos + bytesread;
return bytesread;
}
@Override
public synchronized void mark(int readlimit) {
marklimit = readlimit;
markpos = pos;
}
@Override
public boolean markSupported() {
return true;
}
@Override
public synchronized int read() throws IOException {
if (in == null) {
// K0059=Stream is closed
throw new IOException(); //$NON-NLS-1$
}
/* Are there buffered bytes available? */
if (pos >= count && fillbuf() == -1) {
return -1; /* no, fill buffer */
}
/* Did filling the buffer fail with -1 (EOF)? */
if (count - pos > 0) {
return buf[pos++] & 0xFF;
}
return -1;
}
@Override
public synchronized int read(byte[] buffer, int offset, int length)
throws IOException {
if (closed) {
// K0059=Stream is closed
throw new IOException(); //$NON-NLS-1$
}
// avoid int overflow
if (offset > buffer.length - length || offset < 0 || length < 0) {
throw new IndexOutOfBoundsException();
}
if (length == 0) {
return 0;
}
if (null == buf) {
throw new IOException(); //$NON-NLS-1$
}
int required;
if (pos < count) {
/* There are bytes available in the buffer. */
int copylength = count - pos >= length ? length : count - pos;
System.arraycopy(buf, pos, buffer, offset, copylength);
pos += copylength;
if (copylength == length || in.available() == 0) {
return copylength;
}
offset += copylength;
required = length - copylength;
} else {
required = length;
}
while (true) {
int read;
/*
* If we're not marked and the required size is greater than the
* buffer, simply read the bytes directly bypassing the buffer.
*/
if (markpos == -1 && required >= buf.length) {
read = in.read(buffer, offset, required);
if (read == -1) {
return required == length ? -1 : length - required;
}
} else {
if (fillbuf() == -1) {
return required == length ? -1 : length - required;
}
read = count - pos >= required ? required : count - pos;
System.arraycopy(buf, pos, buffer, offset, read);
pos += read;
}
required -= read;
if (required == 0) {
return length;
}
if (in.available() == 0) {
return length - required;
}
offset += read;
}
}
@Override
public synchronized void reset() throws IOException {
if (closed) {
// K0059=Stream is closed
throw new IOException(); //$NON-NLS-1$
}
if (-1 == markpos) {
// K005a=Mark has been invalidated.
throw new IOException(); //$NON-NLS-1$
}
pos = markpos;
}
@Override
public synchronized long skip(long amount) throws IOException {
if (null == in) {
// K0059=Stream is closed
throw new IOException(); //$NON-NLS-1$
}
if (amount < 1) {
return 0;
}
if (count - pos >= amount) {
pos += amount;
return amount;
}
long read = count - pos;
pos = count;
if (markpos != -1) {
if (amount <= marklimit) {
if (fillbuf() == -1) {
return read;
}
if (count - pos >= amount - read) {
pos += amount - read;
return amount;
}
// Couldn't get all the bytes, skip what we read
read += (count - pos);
pos = count;
return read;
}
markpos = -1;
}
return read + in.skip(amount - read);
}
}
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