langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/file/ModuleNameReader.java
--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/file/ModuleNameReader.java Tue Oct 04 13:41:52 2016 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,228 +0,0 @@
-/*
- * Copyright (c) 1999, 2016, 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 com.sun.tools.javac.file;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.nio.file.Files;
-import java.nio.file.Path;
-
-import com.sun.tools.javac.jvm.ClassFile;
-
-import static com.sun.tools.javac.jvm.ClassFile.*;
-
-
-/**
- * Stripped down ClassReader, just sufficient to read module names from module-info.class files
- * while analyzing the module path.
- *
- * <p>
- * <b>This is NOT part of any supported API. If you write code that depends on this, you do so at
- * your own risk. This code and its internal interfaces are subject to change or deletion without
- * notice.</b>
- */
-public class ModuleNameReader {
- static class BadClassFile extends Exception {
- private static final long serialVersionUID = 0;
- BadClassFile(String msg) {
- super(msg);
- }
- }
-
- private static final int INITIAL_BUFFER_SIZE = 0x0fff0;
-
- /** The buffer containing the currently read class file.
- */
- private byte[] buf = new byte[INITIAL_BUFFER_SIZE];
-
- /** The current input pointer.
- */
- private int bp;
-
- /** The objects of the constant pool.
- */
- private Object[] poolObj;
-
- /** For every constant pool entry, an index into buf where the
- * defining section of the entry is found.
- */
- private int[] poolIdx;
-
- ModuleNameReader() {
- }
-
- String readModuleName(Path p) throws IOException, BadClassFile {
- try (InputStream in = Files.newInputStream(p)) {
- bp = 0;
- buf = readInputStream(buf, in);
-
- int magic = nextInt();
- if (magic != JAVA_MAGIC)
- throw new BadClassFile("illegal.start.of.class.file");
-
- int minorVersion = nextChar();
- int majorVersion = nextChar();
-
- indexPool();
-
- int accessflags = nextChar();
- return readModuleInfoName(nextChar());
- }
- }
-
- /** Extract a character at position bp from buf.
- */
- char getChar(int bp) {
- return
- (char)(((buf[bp] & 0xFF) << 8) + (buf[bp+1] & 0xFF));
- }
-
- /** Read a character.
- */
- char nextChar() {
- return (char)(((buf[bp++] & 0xFF) << 8) + (buf[bp++] & 0xFF));
- }
-
- /** Read an integer.
- */
- int nextInt() {
- return
- ((buf[bp++] & 0xFF) << 24) +
- ((buf[bp++] & 0xFF) << 16) +
- ((buf[bp++] & 0xFF) << 8) +
- (buf[bp++] & 0xFF);
- }
-
- /** Index all constant pool entries, writing their start addresses into
- * poolIdx.
- */
- void indexPool() throws BadClassFile {
- poolIdx = new int[nextChar()];
- poolObj = new Object[poolIdx.length];
- int i = 1;
- while (i < poolIdx.length) {
- poolIdx[i++] = bp;
- byte tag = buf[bp++];
- switch (tag) {
- case CONSTANT_Utf8: case CONSTANT_Unicode: {
- int len = nextChar();
- bp = bp + len;
- break;
- }
- case CONSTANT_Class:
- case CONSTANT_String:
- case CONSTANT_MethodType:
- bp = bp + 2;
- break;
- case CONSTANT_MethodHandle:
- bp = bp + 3;
- break;
- case CONSTANT_Fieldref:
- case CONSTANT_Methodref:
- case CONSTANT_InterfaceMethodref:
- case CONSTANT_NameandType:
- case CONSTANT_Integer:
- case CONSTANT_Float:
- case CONSTANT_InvokeDynamic:
- bp = bp + 4;
- break;
- case CONSTANT_Long:
- case CONSTANT_Double:
- bp = bp + 8;
- i++;
- break;
- default:
- throw new BadClassFile("malformed constant pool");
- }
- }
- }
-
- /** Read the class name of a module-info.class file.
- * The name is stored in a CONSTANT_Class entry, where the
- * class name is of the form module-name/module-info.
- */
- String readModuleInfoName(int i) throws BadClassFile {
- int classIndex = poolIdx[i];
- if (buf[classIndex] == CONSTANT_Class) {
- int utf8Index = poolIdx[getChar(classIndex + 1)];
- if (buf[utf8Index] == CONSTANT_Utf8) {
- int len = getChar(utf8Index + 1);
- int start = utf8Index + 3;
- String suffix = "/module-info";
- if (endsWith(buf, start, len, suffix))
- return new String(ClassFile.internalize(buf, start, len - suffix.length()));
- }
- }
- throw new BadClassFile("bad module-info name");
- }
-
- private boolean endsWith(byte[] buf, int start, int len, String suffix) {
- if (len <= suffix.length())
- return false;
- for (int i = 0; i < suffix.length(); i++) {
- if (buf[start + len - suffix.length() + i] != suffix.charAt(i))
- return false;
- }
- return true;
- }
-
- private static byte[] readInputStream(byte[] buf, InputStream s) throws IOException {
- try {
- buf = ensureCapacity(buf, s.available());
- int r = s.read(buf);
- int bp = 0;
- while (r != -1) {
- bp += r;
- buf = ensureCapacity(buf, bp);
- r = s.read(buf, bp, buf.length - bp);
- }
- return buf;
- } finally {
- try {
- s.close();
- } catch (IOException e) {
- /* Ignore any errors, as this stream may have already
- * thrown a related exception which is the one that
- * should be reported.
- */
- }
- }
- }
-
- /*
- * ensureCapacity will increase the buffer as needed, taking note that
- * the new buffer will always be greater than the needed and never
- * exactly equal to the needed size or bp. If equal then the read (above)
- * will infinitely loop as buf.length - bp == 0.
- */
- private static byte[] ensureCapacity(byte[] buf, int needed) {
- if (buf.length <= needed) {
- byte[] old = buf;
- buf = new byte[Integer.highestOneBit(needed) << 1];
- System.arraycopy(old, 0, buf, 0, old.length);
- }
- return buf;
- }
-}