MultipartStream.java
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org.apache.commons.fileupload |
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Commons FileUpload |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| DECL_COMMENTS | Comments in declarations |  |
| DOC_COMMENT | Number of javadoc comment lines | |
| COMMENTS | Comment lines | |
| SIZE | Size of the file in bytes | |
| LINES | Number of lines in the source file | |
| RETURNS | Number of return points from functions | |
| LINE_COMMENT | Number of line comments | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| BLOCKS | Number of blocks | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| CYCLOMATIC | Cyclomatic complexity | |
| JAVA0119 | JAVA0119 Control variable changed within body of for loop | |
| FUNCTIONS | Number of function declarations | |
| EXEC_COMMENTS | Comments in executable code | |
| LOC | Lines of code | |
| ELOC | Effective lines of code | |
| LOGICAL_LINES | Number of statements | |
| JAVA0123 | JAVA0123 Use all three components of for loop | |
| OPERATORS | Number of operators | |
| BLOCK_COMMENT | Number of block comment lines | |
| UNIQUE_OPERATORS | Number of unique operators | |
| LOOPS | Number of loops | |
| PROGRAM_LENGTH | Halstead program length | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0177 | JAVA0177 Variable declaration missing initializer | |
| JAVA0058 | JAVA0058 Constructor calls super() | |
| PROGRAM_VOLUME | Halstead program volume | |
| PARAMS | Number of formal parameter declarations | |
| JAVA0160 | JAVA0160 Method does not throw specified exception | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0264 | JAVA0264 Integer math in long context - check for overflow | |
| COMPARISONS | Number of comparison operators | |
| WHITESPACE | Number of whitespace lines | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| NEST_DEPTH | Maximum nesting depth | |
| OPERANDS | Number of operands | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
/*
* 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.fileupload;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import org.apache.commons.fileupload.util.Closeable;
import org.apache.commons.fileupload.util.Streams;
/**
* <p> Low level API for processing file uploads.
*
* <p> This class can be used to process data streams conforming to MIME
* 'multipart' format as defined in
* <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>. Arbitrarily
* large amounts of data in the stream can be processed under constant
* memory usage.
*
* <p> The format of the stream is defined in the following way:<br>
*
* <code>
* multipart-body := preamble 1*encapsulation close-delimiter epilogue<br>
* encapsulation := delimiter body CRLF<br>
* delimiter := "--" boundary CRLF<br>
* close-delimiter := "--" boudary "--"<br>
* preamble := <ignore><br>
* epilogue := <ignore><br>
* body := header-part CRLF body-part<br>
* header-part := 1*header CRLF<br>
* header := header-name ":" header-value<br>
* header-name := <printable ascii characters except ":"><br>
* header-value := <any ascii characters except CR & LF><br>
* body-data := <arbitrary data><br>
* </code>
*
* <p>Note that body-data can contain another mulipart entity. There
* is limited support for single pass processing of such nested
* streams. The nested stream is <strong>required</strong> to have a
* boundary token of the same length as the parent stream (see {@link
* #setBoundary(byte[])}).
*
* <p>Here is an example of usage of this class.<br>
*
* <pre>
* try {
* MultipartStream multipartStream = new MultipartStream(input,
* boundary);
* boolean nextPart = multipartStream.skipPreamble();
* OutputStream output;
* while(nextPart) {
* header = chunks.readHeader();
* // process headers
* // create some output stream
* multipartStream.readBodyPart(output);
* nextPart = multipartStream.readBoundary();
* }
* } catch(MultipartStream.MalformedStreamException e) {
* // the stream failed to follow required syntax
* } catch(IOException) {
* // a read or write error occurred
* }
*
* </pre>
*
* @author <a href="mailto:Rafal.Krzewski@e-point.pl">Rafal Krzewski</a>
* @author <a href="mailto:martinc@apache.org">Martin Cooper</a>
* @author Sean C. Sullivan
*
* @version $Id: MultipartStream.java 628386 2008-02-16 22:02:06Z jochen $
*/
public class MultipartStream {
/**
* Internal class, which is used to invoke the
* {@link ProgressListener}.
*/
static class ProgressNotifier {
/** The listener to invoke.
*/
private final ProgressListener listener;
/** Number of expected bytes, if known, or -1.
*/
private final long contentLength;
/** Number of bytes, which have been read so far.
*/
private long bytesRead;
/** Number of items, which have been read so far.
*/
private int items;
/** Creates a new instance with the given listener
* and content length.
* @param pListener The listener to invoke.
* @param pContentLength The expected content length.
*/
ProgressNotifier(ProgressListener pListener, long pContentLength) {
listener = pListener;
contentLength = pContentLength;
}
/** Called to indicate that bytes have been read.
* @param pBytes Number of bytes, which have been read.
*/
void noteBytesRead(int pBytes) {
/* Indicates, that the given number of bytes have been read from
* the input stream.
*/
bytesRead += pBytes;
notifyListener();
}
/** Called to indicate, that a new file item has been detected.
*/
void noteItem() {
++items;
}
/** Called for notifying the listener.
*/
private void notifyListener() {
if (listener != null) {
listener.update(bytesRead, contentLength, items);
}
}
}
// ----------------------------------------------------- Manifest constants
/**
* The Carriage Return ASCII character value.
*/
public static final byte CR = 0x0D;
/**
* The Line Feed ASCII character value.
*/
public static final byte LF = 0x0A;
/**
* The dash (-) ASCII character value.
*/
public static final byte DASH = 0x2D;
/**
* The maximum length of <code>header-part</code> that will be
* processed (10 kilobytes = 10240 bytes.).
*/
public static final int HEADER_PART_SIZE_MAX = 10240;
/**
* The default length of the buffer used for processing a request.
*/
protected static final int DEFAULT_BUFSIZE = 4096;
/**
* A byte sequence that marks the end of <code>header-part</code>
* (<code>CRLFCRLF</code>).
*/
protected static final byte[] HEADER_SEPARATOR = {
CR, LF, CR, LF };
/**
* A byte sequence that that follows a delimiter that will be
* followed by an encapsulation (<code>CRLF</code>).
*/
protected static final byte[] FIELD_SEPARATOR = {
CR, LF};
/**
* A byte sequence that that follows a delimiter of the last
* encapsulation in the stream (<code>--</code>).
*/
protected static final byte[] STREAM_TERMINATOR = {
DASH, DASH};
/**
* A byte sequence that precedes a boundary (<code>CRLF--</code>).
*/
protected static final byte[] BOUNDARY_PREFIX = {
CR, LF, DASH, DASH};
// ----------------------------------------------------------- Data members
/**
* The input stream from which data is read.
*/
private final InputStream input;
/**
* The length of the boundary token plus the leading <code>CRLF--</code>.
*/
private int boundaryLength;
/**
* The amount of data, in bytes, that must be kept in the buffer in order
* to detect delimiters reliably.
*/
private int keepRegion;
/**
* The byte sequence that partitions the stream.
*/
private byte[] boundary;
/**
* The length of the buffer used for processing the request.
*/
private final int bufSize;
/**
* The buffer used for processing the request.
*/
private final byte[] buffer;
/**
* The index of first valid character in the buffer.
* <br>
* 0 <= head < bufSize
*/
private int head;
/**
* The index of last valid characer in the buffer + 1.
* <br>
* 0 <= tail <= bufSize
*/
private int tail;
/**
* The content encoding to use when reading headers.
*/
private String headerEncoding;
/**
* The progress notifier, if any, or null.
*/
private final ProgressNotifier notifier;
// ----------------------------------------------------------- Constructors
/**
* Creates a new instance.
* @deprecated Use {@link #MultipartStream(InputStream, byte[],
* org.apache.commons.fileupload.MultipartStream.ProgressNotifier)},
* or {@link #MultipartStream(InputStream, byte[], int,
* org.apache.commons.fileupload.MultipartStream.ProgressNotifier)}
*/
public MultipartStream() {
this(null, null, null);
}
/**
* <p> Constructs a <code>MultipartStream</code> with a custom size buffer
* and no progress notifier.
*
* <p> Note that the buffer must be at least big enough to contain the
* boundary string, plus 4 characters for CR/LF and double dash, plus at
* least one byte of data. Too small a buffer size setting will degrade
* performance.
*
* @param input The <code>InputStream</code> to serve as a data source.
* @param boundary The token used for dividing the stream into
* <code>encapsulations</code>.
* @param bufSize The size of the buffer to be used, in bytes.
*
* @see #MultipartStream(InputStream, byte[],
* MultipartStream.ProgressNotifier)
* @deprecated Use {@link #MultipartStream(InputStream, byte[], int,
* org.apache.commons.fileupload.MultipartStream.ProgressNotifier)}.
*/
public MultipartStream(InputStream input, byte[] boundary, int bufSize) {
this(input, boundary, bufSize, null);
}
/**
* <p> Constructs a <code>MultipartStream</code> with a custom size buffer.
*
* <p> Note that the buffer must be at least big enough to contain the
* boundary string, plus 4 characters for CR/LF and double dash, plus at
* least one byte of data. Too small a buffer size setting will degrade
* performance.
*
* @param input The <code>InputStream</code> to serve as a data source.
* @param boundary The token used for dividing the stream into
* <code>encapsulations</code>.
* @param bufSize The size of the buffer to be used, in bytes.
* @param pNotifier The notifier, which is used for calling the
* progress listener, if any.
*
* @see #MultipartStream(InputStream, byte[],
* MultipartStream.ProgressNotifier)
*/
MultipartStream(InputStream input,
byte[] boundary,
int bufSize,
ProgressNotifier pNotifier) {
this.input = input;
this.bufSize = bufSize;
this.buffer = new byte[bufSize];
this.notifier = pNotifier;
// We prepend CR/LF to the boundary to chop trailng CR/LF from
// body-data tokens.
this.boundary = new byte[boundary.length + BOUNDARY_PREFIX.length];
this.boundaryLength = boundary.length + BOUNDARY_PREFIX.length;
this.keepRegion = this.boundary.length;
System.arraycopy(BOUNDARY_PREFIX, 0, this.boundary, 0,
BOUNDARY_PREFIX.length);
System.arraycopy(boundary, 0, this.boundary, BOUNDARY_PREFIX.length,
boundary.length);
head = 0;
tail = 0;
}
/**
* <p> Constructs a <code>MultipartStream</code> with a default size buffer.
*
* @param input The <code>InputStream</code> to serve as a data source.
* @param boundary The token used for dividing the stream into
* <code>encapsulations</code>.
* @param pNotifier An object for calling the progress listener, if any.
*
*
* @see #MultipartStream(InputStream, byte[], int,
* MultipartStream.ProgressNotifier)
*/
MultipartStream(InputStream input,
byte[] boundary,
ProgressNotifier pNotifier) {
this(input, boundary, DEFAULT_BUFSIZE, pNotifier);
}
/**
* <p> Constructs a <code>MultipartStream</code> with a default size buffer.
*
* @param input The <code>InputStream</code> to serve as a data source.
* @param boundary The token used for dividing the stream into
* <code>encapsulations</code>.
*
* @deprecated Use {@link #MultipartStream(InputStream, byte[],
* MultipartStream.ProgressNotifier)}.
* @see #MultipartStream(InputStream, byte[], int,
* MultipartStream.ProgressNotifier)
*/
public MultipartStream(InputStream input,
byte[] boundary) {
this(input, boundary, DEFAULT_BUFSIZE, null);
}
// --------------------------------------------------------- Public methods
/**
* Retrieves the character encoding used when reading the headers of an
* individual part. When not specified, or <code>null</code>, the platform
* default encoding is used.
*
* @return The encoding used to read part headers.
*/
public String getHeaderEncoding() {
return headerEncoding;
}
/**
* Specifies the character encoding to be used when reading the headers of
* individual parts. When not specified, or <code>null</code>, the platform
* default encoding is used.
*
* @param encoding The encoding used to read part headers.
*/
public void setHeaderEncoding(String encoding) {
headerEncoding = encoding;
}
/**
* Reads a byte from the <code>buffer</code>, and refills it as
* necessary.
*
* @return The next byte from the input stream.
*
* @throws IOException if there is no more data available.
*/
public byte readByte() throws IOException {
// Buffer depleted ?
if (head == tail) {
head = 0;
// Refill.
tail = input.read(buffer, head, bufSize);
if (tail == -1) {
// No more data available.
throw new IOException("No more data is available");
}
if (notifier != null) {
notifier.noteBytesRead(tail);
}
}
return buffer[head++];
}
/**
* Skips a <code>boundary</code> token, and checks whether more
* <code>encapsulations</code> are contained in the stream.
*
* @return <code>true</code> if there are more encapsulations in
* this stream; <code>false</code> otherwise.
*
* @throws MalformedStreamException if the stream ends unexpecetedly or
* fails to follow required syntax.
*/
public boolean readBoundary()
throws MalformedStreamException {
byte[] marker = new byte[2];
boolean nextChunk = false;
head += boundaryLength;
try {
marker[0] = readByte();
if (marker[0] == LF) {
// Work around IE5 Mac bug with input type=image.
// Because the boundary delimiter, not including the trailing
// CRLF, must not appear within any file (RFC 2046, section
// 5.1.1), we know the missing CR is due to a buggy browser
// rather than a file containing something similar to a
// boundary.
return true;
}
marker[1] = readByte();
if (arrayequals(marker, STREAM_TERMINATOR, 2)) {
nextChunk = false;
} else if (arrayequals(marker, FIELD_SEPARATOR, 2)) {
nextChunk = true;
} else {
throw new MalformedStreamException(
"Unexpected characters follow a boundary");
}
} catch (IOException e) {
throw new MalformedStreamException("Stream ended unexpectedly");
}
return nextChunk;
}
/**
* <p>Changes the boundary token used for partitioning the stream.
*
* <p>This method allows single pass processing of nested multipart
* streams.
*
* <p>The boundary token of the nested stream is <code>required</code>
* to be of the same length as the boundary token in parent stream.
*
* <p>Restoring the parent stream boundary token after processing of a
* nested stream is left to the application.
*
* @param boundary The boundary to be used for parsing of the nested
* stream.
*
* @throws IllegalBoundaryException if the <code>boundary</code>
* has a different length than the one
* being currently parsed.
*/
public void setBoundary(byte[] boundary)
throws IllegalBoundaryException {
if (boundary.length != boundaryLength - BOUNDARY_PREFIX.length) {
throw new IllegalBoundaryException(
"The length of a boundary token can not be changed");
}
System.arraycopy(boundary, 0, this.boundary, BOUNDARY_PREFIX.length,
boundary.length);
}
/**
* <p>Reads the <code>header-part</code> of the current
* <code>encapsulation</code>.
*
* <p>Headers are returned verbatim to the input stream, including the
* trailing <code>CRLF</code> marker. Parsing is left to the
* application.
*
* <p><strong>TODO</strong> allow limiting maximum header size to
* protect against abuse.
*
* @return The <code>header-part</code> of the current encapsulation.
*
* @throws MalformedStreamException if the stream ends unexpecetedly.
*/
public String readHeaders()
throws MalformedStreamException {
int i = 0;
byte b;
// to support multi-byte characters
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int size = 0;
while (i < HEADER_SEPARATOR.length) {
try {
b = readByte();
} catch (IOException e) {
throw new MalformedStreamException("Stream ended unexpectedly");
}
if (++size > HEADER_PART_SIZE_MAX) {
throw new MalformedStreamException(
"Header section has more than " + HEADER_PART_SIZE_MAX
+ " bytes (maybe it is not properly terminated)");
}
if (b == HEADER_SEPARATOR[i]) {
i++;
} else {
i = 0;
}
baos.write(b);
}
String headers = null;
if (headerEncoding != null) {
try {
headers = baos.toString(headerEncoding);
} catch (UnsupportedEncodingException e) {
// Fall back to platform default if specified encoding is not
// supported.
headers = baos.toString();
}
} else {
headers = baos.toString();
}
return headers;
}
/**
* <p>Reads <code>body-data</code> from the current
* <code>encapsulation</code> and writes its contents into the
* output <code>Stream</code>.
*
* <p>Arbitrary large amounts of data can be processed by this
* method using a constant size buffer. (see {@link
* #MultipartStream(InputStream,byte[],int,
* MultipartStream.ProgressNotifier) constructor}).
*
* @param output The <code>Stream</code> to write data into. May
* be null, in which case this method is equivalent
* to {@link #discardBodyData()}.
*
* @return the amount of data written.
*
* @throws MalformedStreamException if the stream ends unexpectedly.
* @throws IOException if an i/o error occurs.
*/
public int readBodyData(OutputStream output)
throws MalformedStreamException, IOException {
final InputStream istream = newInputStream();
return (int) Streams.copy(istream, output, false);
}
/**
* Creates a new {@link ItemInputStream}.
* @return A new instance of {@link ItemInputStream}.
*/
ItemInputStream newInputStream() {
return new ItemInputStream();
}
/**
* <p> Reads <code>body-data</code> from the current
* <code>encapsulation</code> and discards it.
*
* <p>Use this method to skip encapsulations you don't need or don't
* understand.
*
* @return The amount of data discarded.
*
* @throws MalformedStreamException if the stream ends unexpectedly.
* @throws IOException if an i/o error occurs.
*/
public int discardBodyData()
throws MalformedStreamException,
IOException {
return readBodyData(null);
}
/**
* Finds the beginning of the first <code>encapsulation</code>.
*
* @return <code>true</code> if an <code>encapsulation</code> was found in
* the stream.
*
* @throws IOException if an i/o error occurs.
*/
public boolean skipPreamble()
throws IOException {
// First delimiter may be not preceeded with a CRLF.
System.arraycopy(boundary, 2, boundary, 0, boundary.length - 2);
boundaryLength = boundary.length - 2;
try {
// Discard all data up to the delimiter.
discardBodyData();
// Read boundary - if succeded, the stream contains an
// encapsulation.
return readBoundary();
} catch (MalformedStreamException e) {
return false;
} finally {
// Restore delimiter.
System.arraycopy(boundary, 0, boundary, 2, boundary.length - 2);
boundaryLength = boundary.length;
boundary[0] = CR;
boundary[1] = LF;
}
}
/**
* Compares <code>count</code> first bytes in the arrays
* <code>a</code> and <code>b</code>.
*
* @param a The first array to compare.
* @param b The second array to compare.
* @param count How many bytes should be compared.
*
* @return <code>true</code> if <code>count</code> first bytes in arrays
* <code>a</code> and <code>b</code> are equal.
*/
public static boolean arrayequals(byte[] a,
byte[] b,
int count) {
for (int i = 0; i < count; i++) {
if (a[i] != b[i]) {
return false;
}
}
return true;
}
/**
* Searches for a byte of specified value in the <code>buffer</code>,
* starting at the specified <code>position</code>.
*
* @param value The value to find.
* @param pos The starting position for searching.
*
* @return The position of byte found, counting from beginning of the
* <code>buffer</code>, or <code>-1</code> if not found.
*/
protected int findByte(byte value,
int pos) {
for (int i = pos; i < tail; i++) {
if (buffer[i] == value) {
return i;
}
}
return -1;
}
/**
* Searches for the <code>boundary</code> in the <code>buffer</code>
* region delimited by <code>head</code> and <code>tail</code>.
*
* @return The position of the boundary found, counting from the
* beginning of the <code>buffer</code>, or <code>-1</code> if
* not found.
*/
protected int findSeparator() {
int first;
int match = 0;
int maxpos = tail - boundaryLength;
for (first = head;
(first <= maxpos) && (match != boundaryLength);
first++) {
first = findByte(boundary[0], first);
if (first == -1 || (first > maxpos)) {
return -1;
}
for (match = 1; match < boundaryLength; match++) {
if (buffer[first + match] != boundary[match]) {
break;
}
}
}
if (match == boundaryLength) {
return first - 1;
}
return -1;
}
/**
* Thrown to indicate that the input stream fails to follow the
* required syntax.
*/
public static class MalformedStreamException
extends IOException {
/**
* Constructs a <code>MalformedStreamException</code> with no
* detail message.
*/
public MalformedStreamException() {
super();
}
/**
* Constructs an <code>MalformedStreamException</code> with
* the specified detail message.
*
* @param message The detail message.
*/
public MalformedStreamException(String message) {
super(message);
}
}
/**
* Thrown upon attempt of setting an invalid boundary token.
*/
public static class IllegalBoundaryException
extends IOException {
/**
* Constructs an <code>IllegalBoundaryException</code> with no
* detail message.
*/
public IllegalBoundaryException() {
super();
}
/**
* Constructs an <code>IllegalBoundaryException</code> with
* the specified detail message.
*
* @param message The detail message.
*/
public IllegalBoundaryException(String message) {
super(message);
}
}
/**
* An {@link InputStream} for reading an items contents.
*/
public class ItemInputStream extends InputStream implements Closeable {
/** The number of bytes, which have been read so far.
*/
private long total;
/** The number of bytes, which must be hold, because
* they might be a part of the boundary.
*/
private int pad;
/** The current offset in the buffer.
*/
private int pos;
/** Whether the stream is already closed.
*/
private boolean closed;
/**
* Creates a new instance.
*/
ItemInputStream() {
findSeparator();
}
/**
* Called for finding the separator.
*/
private void findSeparator() {
pos = MultipartStream.this.findSeparator();
if (pos == -1) {
if (tail - head > keepRegion) {
pad = keepRegion;
} else {
pad = tail - head;
}
}
}
/**
* Returns the number of bytes, which have been read
* by the stream.
* @return Number of bytes, which have been read so far.
*/
public long getBytesRead() {
return total;
}
/**
* Returns the number of bytes, which are currently
* available, without blocking.
* @throws IOException An I/O error occurs.
* @return Number of bytes in the buffer.
*/
public int available() throws IOException {
if (pos == -1) {
return tail - head - pad;
}
return pos - head;
}
/** Offset when converting negative bytes to integers.
*/
private static final int BYTE_POSITIVE_OFFSET = 256;
/**
* Returns the next byte in the stream.
* @return The next byte in the stream, as a non-negative
* integer, or -1 for EOF.
* @throws IOException An I/O error occurred.
*/
public int read() throws IOException {
if (closed) {
throw new FileItemStream.ItemSkippedException();
}
if (available() == 0) {
if (makeAvailable() == 0) {
return -1;
}
}
++total;
int b = buffer[head++];
if (b >= 0) {
return b;
}
return b + BYTE_POSITIVE_OFFSET;
}
/**
* Reads bytes into the given buffer.
* @param b The destination buffer, where to write to.
* @param off Offset of the first byte in the buffer.
* @param len Maximum number of bytes to read.
* @return Number of bytes, which have been actually read,
* or -1 for EOF.
* @throws IOException An I/O error occurred.
*/
public int read(byte[] b, int off, int len) throws IOException {
if (closed) {
throw new FileItemStream.ItemSkippedException();
}
if (len == 0) {
return 0;
}
int res = available();
if (res == 0) {
res = makeAvailable();
if (res == 0) {
return -1;
}
}
res = Math.min(res, len);
System.arraycopy(buffer, head, b, off, res);
head += res;
total += res;
return res;
}
/**
* Closes the input stream.
* @throws IOException An I/O error occurred.
*/
public void close() throws IOException {
close(false);
}
/**
* Closes the input stream.
* @param pCloseUnderlying Whether to close the underlying stream
* (hard close)
* @throws IOException An I/O error occurred.
*/
public void close(boolean pCloseUnderlying) throws IOException {
if (closed) {
return;
}
if (pCloseUnderlying) {
closed = true;
input.close();
} else {
for (;;) {
int av = available();
if (av == 0) {
av = makeAvailable();
if (av == 0) {
break;
}
}
skip(av);
}
}
closed = true;
}
/**
* Skips the given number of bytes.
* @param bytes Number of bytes to skip.
* @return The number of bytes, which have actually been
* skipped.
* @throws IOException An I/O error occurred.
*/
public long skip(long bytes) throws IOException {
if (closed) {
throw new FileItemStream.ItemSkippedException();
}
int av = available();
if (av == 0) {
av = makeAvailable();
if (av == 0) {
return 0;
}
}
long res = Math.min(av, bytes);
head += res;
return res;
}
/**
* Attempts to read more data.
* @return Number of available bytes
* @throws IOException An I/O error occurred.
*/
private int makeAvailable() throws IOException {
if (pos != -1) {
return 0;
}
// Move the data to the beginning of the buffer.
total += tail - head - pad;
System.arraycopy(buffer, tail - pad, buffer, 0, pad);
// Refill buffer with new data.
head = 0;
tail = pad;
for (;;) {
int bytesRead = input.read(buffer, tail, bufSize - tail);
if (bytesRead == -1) {
// The last pad amount is left in the buffer.
// Boundary can't be in there so signal an error
// condition.
final String msg = "Stream ended unexpectedly";
throw new MalformedStreamException(msg);
}
if (notifier != null) {
notifier.noteBytesRead(bytesRead);
}
tail += bytesRead;
findSeparator();
int av = available();
if (av > 0 || pos != -1) {
return av;
}
}
}
/**
* Returns, whether the stream is closed.
* @return True, if the stream is closed, otherwise false.
*/
public boolean isClosed() {
return closed;
}
}
// ------------------------------------------------------ Debugging methods
// These are the methods that were used to debug this stuff.
/*
// Dump data.
protected void dump()
{
System.out.println("01234567890");
byte[] temp = new byte[buffer.length];
for(int i=0; i<buffer.length; i++)
{
if (buffer[i] == 0x0D || buffer[i] == 0x0A)
{
temp[i] = 0x21;
}
else
{
temp[i] = buffer[i];
}
}
System.out.println(new String(temp));
int i;
for (i=0; i<head; i++)
System.out.print(" ");
System.out.println("h");
for (i=0; i<tail; i++)
System.out.print(" ");
System.out.println("t");
System.out.flush();
}
// Main routine, for testing purposes only.
//
// @param args A String[] with the command line arguments.
// @throws Exception, a generic exception.
public static void main( String[] args )
throws Exception
{
File boundaryFile = new File("boundary.dat");
int boundarySize = (int)boundaryFile.length();
byte[] boundary = new byte[boundarySize];
FileInputStream input = new FileInputStream(boundaryFile);
input.read(boundary,0,boundarySize);
input = new FileInputStream("multipart.dat");
MultipartStream chunks = new MultipartStream(input, boundary);
int i = 0;
String header;
OutputStream output;
boolean nextChunk = chunks.skipPreamble();
while (nextChunk)
{
header = chunks.readHeaders();
System.out.println("!"+header+"!");
System.out.println("wrote part"+i+".dat");
output = new FileOutputStream("part"+(i++)+".dat");
chunks.readBodyData(output);
nextChunk = chunks.readBoundary();
}
}
*/
}
The table below shows all metrics for MultipartStream.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 96.00 | Number of blocks | |
| BLOCK_COMMENT | 80.00 | Number of block comment lines | |
| COMMENTS | 567.00 | Comment lines | |
| COMMENT_DENSITY | 1.85 | Comment density | |
| COMPARISONS | 41.00 | Number of comparison operators | |
| CYCLOMATIC | 89.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 78.00 | Comments in declarations | |
| DOC_COMMENT | 457.00 | Number of javadoc comment lines | |
| ELOC | 306.00 | Effective lines of code | |
| EXEC_COMMENTS | 15.00 | Comments in executable code | |
| EXITS | 25.00 | Procedure exits | |
| FUNCTIONS | 37.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 99.47 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 106.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 0.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 0.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 0.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 0.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 2.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 0.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 0.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 0.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 0.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 0.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 0.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 0.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 0.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 3.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 2.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 0.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 0.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 0.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 0.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 1.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 0.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 2.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 2.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 0.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 1.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 1073.00 | Number of lines in the source file | |
| LINE_COMMENT | 30.00 | Number of line comments | |
| LOC | 396.00 | Lines of code | |
| LOGICAL_LINES | 186.00 | Number of statements | |
| LOOPS | 7.00 | Number of loops | |
| NEST_DEPTH | 5.00 | Maximum nesting depth | |
| OPERANDS | 630.00 | Number of operands | |
| OPERATORS | 1459.00 | Number of operators | |
| PARAMS | 30.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 2089.00 | Halstead program length | |
| PROGRAM_VOCAB | 225.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 76.00 | Number of return points from functions | |
| SIZE | 34204.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 171.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 54.00 | Number of unique operators | |
| WHITESPACE | 110.00 | Number of whitespace lines | |