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Copy pathChunkedInputStream.java
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176 lines (159 loc) · 5.4 KB
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/*
* Copyright (c) 2005, 2011, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
package net.tommalone.httpserver;
import java.io.*;
import java.net.*;
import net.tommalone.httpserver.*;
import net.tommalone.httpserver.spi.*;
class ChunkedInputStream extends LeftOverInputStream {
ChunkedInputStream (ExchangeImpl t, InputStream src) {
super (t, src);
}
private int remaining;
/* true when a chunk header needs to be read */
private boolean needToReadHeader = true;
static char CR = '\r';
static char LF = '\n';
private int numeric (char[] arr, int nchars) throws IOException {
assert arr.length >= nchars;
int len = 0;
for (int i=0; i<nchars; i++) {
char c = arr[i];
int val=0;
if (c>='0' && c <='9') {
val = c - '0';
} else if (c>='a' && c<= 'f') {
val = c - 'a' + 10;
} else if (c>='A' && c<= 'F') {
val = c - 'A' + 10;
} else {
throw new IOException ("invalid chunk length");
}
len = len * 16 + val;
}
return len;
}
/* read the chunk header line and return the chunk length
* any chunk extensions are ignored
*/
private int readChunkHeader () throws IOException {
boolean gotCR = false;
int c;
char[] len_arr = new char [16];
int len_size = 0;
boolean end_of_len = false;
while ((c=in.read())!= -1) {
char ch = (char) c;
if (len_size == len_arr.length -1) {
throw new IOException ("invalid chunk header");
}
if (gotCR) {
if (ch == LF) {
int l = numeric (len_arr, len_size);
return l;
} else {
gotCR = false;
}
if (!end_of_len) {
len_arr[len_size++] = ch;
}
} else {
if (ch == CR) {
gotCR = true;
} else if (ch == ';') {
end_of_len = true;
} else if (!end_of_len) {
len_arr[len_size++] = ch;
}
}
}
throw new IOException ("end of stream reading chunk header");
}
protected int readImpl (byte[]b, int off, int len) throws IOException {
if (eof) {
return -1;
}
if (needToReadHeader) {
remaining = readChunkHeader();
if (remaining == 0) {
eof = true;
consumeCRLF();
t.getServerImpl().requestCompleted (t.getConnection());
return -1;
}
needToReadHeader = false;
}
if (len > remaining) {
len = remaining;
}
int n = in.read(b, off, len);
if (n > -1) {
remaining -= n;
}
if (remaining == 0) {
needToReadHeader = true;
consumeCRLF();
}
return n;
}
private void consumeCRLF () throws IOException {
char c;
c = (char)in.read(); /* CR */
if (c != CR) {
throw new IOException ("invalid chunk end");
}
c = (char)in.read(); /* LF */
if (c != LF) {
throw new IOException ("invalid chunk end");
}
}
/**
* returns the number of bytes available to read in the current chunk
* which may be less than the real amount, but we'll live with that
* limitation for the moment. It only affects potential efficiency
* rather than correctness.
*/
public int available () throws IOException {
if (eof || closed) {
return 0;
}
int n = in.available();
return n > remaining? remaining: n;
}
/* called after the stream is closed to see if bytes
* have been read from the underlying channel
* and buffered internally
*/
public boolean isDataBuffered () throws IOException {
assert eof;
return in.available() > 0;
}
public boolean markSupported () {return false;}
public void mark (int l) {
}
public void reset () throws IOException {
throw new IOException ("mark/reset not supported");
}
}