jaroslav@672: /*
jaroslav@672:  * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
jaroslav@672:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@672:  *
jaroslav@672:  * This code is free software; you can redistribute it and/or modify it
jaroslav@672:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@672:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@672:  * particular file as subject to the "Classpath" exception as provided
jaroslav@672:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@672:  *
jaroslav@672:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@672:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@672:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@672:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@672:  * accompanied this code).
jaroslav@672:  *
jaroslav@672:  * You should have received a copy of the GNU General Public License version
jaroslav@672:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@672:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@672:  *
jaroslav@672:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@672:  * or visit www.oracle.com if you need additional information or have any
jaroslav@672:  * questions.
jaroslav@672:  */
jaroslav@672: package org.apidesign.bck2brwsr.emul.lang;
jaroslav@672: 
jaroslav@672: import java.io.FilterInputStream;
jaroslav@672: import java.io.IOException;
jaroslav@672: import java.io.InputStream;
jaroslav@672: 
jaroslav@672: /*
jaroslav@672:  * A fast buffered input stream for parsing manifest files.
jaroslav@672:  * 
jaroslav@672:  * Taken from java.util.jar.Manifest.FastInputStream and modified to be
jaroslav@672:  * independent of other Manifest functionality.
jaroslav@672:  */
jaroslav@672: public abstract class ManifestInputStream extends FilterInputStream {
jaroslav@672:     private byte[] buf;
jaroslav@672:     private int count = 0;
jaroslav@672:     private int pos = 0;
jaroslav@672: 
jaroslav@672:     protected ManifestInputStream(InputStream in) {
jaroslav@672:         this(in, 8192);
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     protected ManifestInputStream(InputStream in, int size) {
jaroslav@672:         super(in);
jaroslav@672:         buf = new byte[size];
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     public int read() throws IOException {
jaroslav@672:         if (pos >= count) {
jaroslav@672:             fill();
jaroslav@672:             if (pos >= count) {
jaroslav@672:                 return -1;
jaroslav@672:             }
jaroslav@672:         }
jaroslav@672:         return buf[pos++] & 0xff;
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     public int read(byte[] b, int off, int len) throws IOException {
jaroslav@672:         int avail = count - pos;
jaroslav@672:         if (avail <= 0) {
jaroslav@672:             if (len >= buf.length) {
jaroslav@672:                 return in.read(b, off, len);
jaroslav@672:             }
jaroslav@672:             fill();
jaroslav@672:             avail = count - pos;
jaroslav@672:             if (avail <= 0) {
jaroslav@672:                 return -1;
jaroslav@672:             }
jaroslav@672:         }
jaroslav@672:         if (len > avail) {
jaroslav@672:             len = avail;
jaroslav@672:         }
jaroslav@672:         System.arraycopy(buf, pos, b, off, len);
jaroslav@672:         pos += len;
jaroslav@672:         return len;
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     /*
jaroslav@672:      * Reads 'len' bytes from the input stream, or until an end-of-line
jaroslav@672:      * is reached. Returns the number of bytes read.
jaroslav@672:      */
jaroslav@672:     public int readLine(byte[] b, int off, int len) throws IOException {
jaroslav@672:         byte[] tbuf = this.buf;
jaroslav@672:         int total = 0;
jaroslav@672:         while (total < len) {
jaroslav@672:             int avail = count - pos;
jaroslav@672:             if (avail <= 0) {
jaroslav@672:                 fill();
jaroslav@672:                 avail = count - pos;
jaroslav@672:                 if (avail <= 0) {
jaroslav@672:                     return -1;
jaroslav@672:                 }
jaroslav@672:             }
jaroslav@672:             int n = len - total;
jaroslav@672:             if (n > avail) {
jaroslav@672:                 n = avail;
jaroslav@672:             }
jaroslav@672:             int tpos = pos;
jaroslav@672:             int maxpos = tpos + n;
jaroslav@672:             while (tpos < maxpos && tbuf[tpos++] != '\n') {
jaroslav@672:                 ;
jaroslav@672:             }
jaroslav@672:             n = tpos - pos;
jaroslav@672:             System.arraycopy(tbuf, pos, b, off, n);
jaroslav@672:             off += n;
jaroslav@672:             total += n;
jaroslav@672:             pos = tpos;
jaroslav@672:             if (tbuf[tpos - 1] == '\n') {
jaroslav@672:                 break;
jaroslav@672:             }
jaroslav@672:         }
jaroslav@672:         return total;
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     public byte peek() throws IOException {
jaroslav@672:         if (pos == count) {
jaroslav@672:             fill();
jaroslav@672:         }
jaroslav@672:         if (pos == count) {
jaroslav@672:             return -1; // nothing left in buffer
jaroslav@672:         }
jaroslav@672:         return buf[pos];
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     public int readLine(byte[] b) throws IOException {
jaroslav@672:         return readLine(b, 0, b.length);
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     public long skip(long n) throws IOException {
jaroslav@672:         if (n <= 0) {
jaroslav@672:             return 0;
jaroslav@672:         }
jaroslav@672:         long avail = count - pos;
jaroslav@672:         if (avail <= 0) {
jaroslav@672:             return in.skip(n);
jaroslav@672:         }
jaroslav@672:         if (n > avail) {
jaroslav@672:             n = avail;
jaroslav@672:         }
jaroslav@672:         pos += n;
jaroslav@672:         return n;
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     public int available() throws IOException {
jaroslav@672:         return (count - pos) + in.available();
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     public void close() throws IOException {
jaroslav@672:         if (in != null) {
jaroslav@672:             in.close();
jaroslav@672:             in = null;
jaroslav@672:             buf = null;
jaroslav@672:         }
jaroslav@672:     }
jaroslav@672: 
jaroslav@672:     private void fill() throws IOException {
jaroslav@672:         count = pos = 0;
jaroslav@672:         int n = in.read(buf, 0, buf.length);
jaroslav@672:         if (n > 0) {
jaroslav@672:             count = n;
jaroslav@672:         }
jaroslav@672:     }
jaroslav@672:     
jaroslav@672:     protected abstract String putValue(String key, String value);
jaroslav@672: 
jaroslav@672:     public void readAttributes(byte[] lbuf) throws IOException {
jaroslav@672:         ManifestInputStream is = this;
jaroslav@672: 
jaroslav@672:         String name = null;
jaroslav@672:         String value = null;
jaroslav@672:         byte[] lastline = null;
jaroslav@672:         int len;
jaroslav@672:         while ((len = is.readLine(lbuf)) != -1) {
jaroslav@672:             boolean lineContinued = false;
jaroslav@672:             if (lbuf[--len] != '\n') {
jaroslav@672:                 throw new IOException("line too long");
jaroslav@672:             }
jaroslav@672:             if (len > 0 && lbuf[len - 1] == '\r') {
jaroslav@672:                 --len;
jaroslav@672:             }
jaroslav@672:             if (len == 0) {
jaroslav@672:                 break;
jaroslav@672:             }
jaroslav@672:             int i = 0;
jaroslav@672:             if (lbuf[0] == ' ') {
jaroslav@672:                 if (name == null) {
jaroslav@672:                     throw new IOException("misplaced continuation line");
jaroslav@672:                 }
jaroslav@672:                 lineContinued = true;
jaroslav@672:                 byte[] buf = new byte[lastline.length + len - 1];
jaroslav@672:                 System.arraycopy(lastline, 0, buf, 0, lastline.length);
jaroslav@672:                 System.arraycopy(lbuf, 1, buf, lastline.length, len - 1);
jaroslav@672:                 if (is.peek() == ' ') {
jaroslav@672:                     lastline = buf;
jaroslav@672:                     continue;
jaroslav@672:                 }
jaroslav@672:                 value = new String(buf, 0, buf.length, "UTF8");
jaroslav@672:                 lastline = null;
jaroslav@672:             } else {
jaroslav@672:                 while (lbuf[i++] != ':') {
jaroslav@672:                     if (i >= len) {
jaroslav@672:                         throw new IOException("invalid header field");
jaroslav@672:                     }
jaroslav@672:                 }
jaroslav@672:                 if (lbuf[i++] != ' ') {
jaroslav@672:                     throw new IOException("invalid header field");
jaroslav@672:                 }
jaroslav@672:                 name = new String(lbuf, 0, 0, i - 2);
jaroslav@672:                 if (is.peek() == ' ') {
jaroslav@672:                     lastline = new byte[len - i];
jaroslav@672:                     System.arraycopy(lbuf, i, lastline, 0, len - i);
jaroslav@672:                     continue;
jaroslav@672:                 }
jaroslav@672:                 value = new String(lbuf, i, len - i, "UTF8");
jaroslav@672:             }
jaroslav@672:             try {
jaroslav@672:                 if ((putValue(name, value) != null) && (!lineContinued)) {
jaroslav@672:                     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.");
jaroslav@672:                 }
jaroslav@672:             } catch (IllegalArgumentException e) {
jaroslav@672:                 throw new IOException("invalid header field name: " + name);
jaroslav@672:             }
jaroslav@672:         }
jaroslav@672:     }
jaroslav@672: }