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/*
* Copyright (c) 1997, 2008, 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 org.apidesign.bck2brwsr.emul.lang;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apidesign.bck2brwsr.core.Exported;
/*
* A fast buffered input stream for parsing manifest files.
*
* Taken from java.util.jar.Manifest.FastInputStream and modified to be
* independent of other Manifest functionality.
*/
@Exported
public abstract class ManifestInputStream extends FilterInputStream {
private byte[] buf;
private int count = 0;
private int pos = 0;
protected ManifestInputStream(InputStream in) {
this(in, 8192);
}
protected ManifestInputStream(InputStream in, int size) {
super(in);
buf = new byte[size];
}
public int read() throws IOException {
if (pos >= count) {
fill();
if (pos >= count) {
return -1;
}
}
return buf[pos++] & 0xff;
}
public int read(byte[] b, int off, int len) throws IOException {
int avail = count - pos;
if (avail <= 0) {
if (len >= buf.length) {
return in.read(b, off, len);
}
fill();
avail = count - pos;
if (avail <= 0) {
return -1;
}
}
if (len > avail) {
len = avail;
}
System.arraycopy(buf, pos, b, off, len);
pos += len;
return len;
}
/*
* Reads 'len' bytes from the input stream, or until an end-of-line
* is reached. Returns the number of bytes read.
*/
public int readLine(byte[] b, int off, int len) throws IOException {
byte[] tbuf = this.buf;
int total = 0;
while (total < len) {
int avail = count - pos;
if (avail <= 0) {
fill();
avail = count - pos;
if (avail <= 0) {
return -1;
}
}
int n = len - total;
if (n > avail) {
n = avail;
}
int tpos = pos;
int maxpos = tpos + n;
while (tpos < maxpos && tbuf[tpos++] != '\n') {
;
}
n = tpos - pos;
System.arraycopy(tbuf, pos, b, off, n);
off += n;
total += n;
pos = tpos;
if (tbuf[tpos - 1] == '\n') {
break;
}
}
return total;
}
public byte peek() throws IOException {
if (pos == count) {
fill();
}
if (pos == count) {
return -1; // nothing left in buffer
}
return buf[pos];
}
public int readLine(byte[] b) throws IOException {
return readLine(b, 0, b.length);
}
public long skip(long n) throws IOException {
if (n <= 0) {
return 0;
}
long avail = count - pos;
if (avail <= 0) {
return in.skip(n);
}
if (n > avail) {
n = avail;
}
pos += n;
return n;
}
public int available() throws IOException {
return (count - pos) + in.available();
}
public void close() throws IOException {
if (in != null) {
in.close();
in = null;
buf = null;
}
}
private void fill() throws IOException {
count = pos = 0;
int n = in.read(buf, 0, buf.length);
if (n > 0) {
count = n;
}
}
protected abstract String putValue(String key, String value);
public void readAttributes(byte[] lbuf) throws IOException {
ManifestInputStream is = this;
String name = null;
String value = null;
byte[] lastline = null;
int len;
while ((len = is.readLine(lbuf)) != -1) {
boolean lineContinued = false;
if (lbuf[--len] != '\n') {
throw new IOException("line too long");
}
if (len > 0 && lbuf[len - 1] == '\r') {
--len;
}
if (len == 0) {
break;
}
int i = 0;
if (lbuf[0] == ' ') {
if (name == null) {
throw new IOException("misplaced continuation line");
}
lineContinued = true;
byte[] buf = new byte[lastline.length + len - 1];
System.arraycopy(lastline, 0, buf, 0, lastline.length);
System.arraycopy(lbuf, 1, buf, lastline.length, len - 1);
if (is.peek() == ' ') {
lastline = buf;
continue;
}
value = new String(buf, 0, buf.length, "UTF8");
lastline = null;
} else {
while (lbuf[i++] != ':') {
if (i >= len) {
throw new IOException("invalid header field");
}
}
if (lbuf[i++] != ' ') {
throw new IOException("invalid header field");
}
name = new String(lbuf, 0, 0, i - 2);
if (is.peek() == ' ') {
lastline = new byte[len - i];
System.arraycopy(lbuf, i, lastline, 0, len - i);
continue;
}
value = new String(lbuf, i, len - i, "UTF8");
}
try {
if ((putValue(name, value) != null) && (!lineContinued)) {
throw new IOException("Duplicate name in Manifest: " + name + ".\n" + "Ensure that the manifest does not " + "have duplicate entries, and\n" + "that blank lines separate " + "individual sections in both your\n" + "manifest and in the META-INF/MANIFEST.MF " + "entry in the jar file.");
}
} catch (IllegalArgumentException e) {
throw new IOException("invalid header field name: " + name);
}
}
}
}
