300 lines
10 KiB
Java
300 lines
10 KiB
Java
import java.io.File;
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import java.io.FileInputStream;
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import java.nio.ByteBuffer;
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import java.nio.channels.Channels;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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public class Jocaml {
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private static String TRAILER_MAGIC = "Caml1999X028";
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private static long MARSHAL_MAGIC_SMALL = 0x8495A6BE;
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private static long MARSHAL_MAGIC_BIG = 0x8495A6BF;
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private static class CodeOffset {
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public final int offset;
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public CodeOffset(int offset) {
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this.offset = offset;
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}
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public String toString() {
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return "CodeOffset<" + offset + ">";
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}
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public boolean equals(Object other) {
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return other instanceof CodeOffset && ((CodeOffset) other).offset == this.offset;
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}
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public int hashCode() {
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return offset * 13;
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}
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}
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private static class Block {
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public final int tag;
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public final List<Object> contents;
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public Block(int tag, List<Object> contents) {
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this.tag = tag;
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this.contents = contents;
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}
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public String toString() {
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return "Block<" + tag + ": " + contents.toString() + ">";
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}
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}
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private static class Section {
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String name;
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ByteBuffer data;
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public Section(String name, ByteBuffer data) {
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this.name = name;
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this.data = data;
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}
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public String toString() {
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return "Section<name=" + name + ", length=" + data.capacity() + ">";
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}
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public List<String> unstring() {
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List<String> strings = new ArrayList<>();
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for (int i = 0; i < this.data.capacity();) {
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StringBuffer buf = new StringBuffer();
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while (this.data.get(i) != 0) {
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buf.append((char) this.data.get(i));
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i += 1;
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}
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strings.add(buf.toString());
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i += 1;
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}
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return strings;
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}
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private Object parseNextObject(List<Object> shared) throws Exception {
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int nextTag = this.data.get() & (short) 0xff;
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switch (nextTag) {
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// integers
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case 0x00: {
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byte value = this.data.get();
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return Long.valueOf(value);
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}
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case 0x01: {
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short value = this.data.getShort();
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return Long.valueOf(value);
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}
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case 0x02: {
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int value = this.data.getInt();
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return Long.valueOf(value);
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}
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case 0x03: {
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long value = this.data.getLong();
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return Long.valueOf(value);
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}
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// shared elements
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case 0x04: {
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long offset = this.data.get() & (long) 0xff;
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return shared.get((int) offset);
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}
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case 0x05: {
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long offset = this.data.getShort() & (long) 0xff;
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return shared.get((int) offset);
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}
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case 0x06: {
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long offset = this.data.getInt() & (long) 0xff;
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return shared.get((int) offset);
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}
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// blocks
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case 0x08: {
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long header = this.data.getInt() & (long) 0xff;
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int tag = (int) header & 0xff;
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long size = header >> 10;
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List<Object> elems = new ArrayList<>();
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Block block = new Block(tag, elems);
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if (size > 0) {
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shared.add(block);
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for (int i = 0; i < size; i++) {
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elems.add(parseNextObject(shared));
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}
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}
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return block;
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}
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case 0x13: {
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throw new Exception("long block not supported");
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}
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// string
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case 0x09: {
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int len = this.data.get() & (short) 0xff;
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byte[] buf = new byte[len];
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this.data.get(buf);
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String s = new String(buf);
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shared.add(s);
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return s;
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}
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case 0x0a: {
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long len = this.data.getInt() & (long) 0xff;
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byte[] buf = new byte[(int)len];
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this.data.get(buf);
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String s = new String(buf);
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shared.add(s);
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return s;
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}
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// float
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case 0x0b:
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case 0x0c: {
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Double obj = Double.valueOf(this.data.getDouble());
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shared.add(obj);
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return obj;
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}
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case 0x0D:
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case 0x0E: {
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throw new Exception("double array not supported");
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}
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case 0x07:
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case 0x0f: {
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throw new Exception("double array not supported");
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}
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// misc
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case 0x10: {
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throw new Exception("code pointer with checksum");
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}
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case 0x11: {
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throw new Exception("code pointer with closure");
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}
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case 0x12:
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case 0x18:
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case 0x19: {
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StringBuffer buf = new StringBuffer();
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while (true) {
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int next = this.data.get() & (short) 0xff;
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if (next == 0) {
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break;
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}
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buf.append((char) next);
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}
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String name = buf.toString();
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switch (name) {
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// int64
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case "_j": {
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long v = Long.valueOf(this.data.getLong());
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shared.add(v);
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return v;
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}
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default:
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throw new Exception("unknown custom op: " + name);
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}
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}
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default: {
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if (nextTag < 0x20) {
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throw new Exception("invalid tag " + nextTag);
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} else if (nextTag < 0x40) {
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int length = nextTag & 0x1f;
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byte[] buf = new byte[(int)length];
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this.data.get(buf);
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String s = new String(buf);
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shared.add(s);
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return s;
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} else if (nextTag < 0x80) {
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Long value = Long.valueOf(nextTag & 0x3f);
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return value;
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} else {
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long size = (nextTag >> 4) & 0x07;
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int tag = nextTag & 0x0f;
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List<Object> elems = new ArrayList<>();
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Block block = new Block(tag, elems);
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if (size > 0) {
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shared.add(block);
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for (int i = 0; i < size; i++) {
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elems.add(parseNextObject(shared));
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}
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}
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return block;
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}
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}
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}
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}
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public void unmarshal() throws Exception {
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int magic = this.data.getInt(0);
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if (magic != MARSHAL_MAGIC_SMALL) {
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throw new Exception("bad marshal magic");
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}
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int byteLength = this.data.getInt(4);
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int numObjs = this.data.getInt(8);
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System.out.println(numObjs);
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List<Object> shared = new ArrayList<>();
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List<Object> objs = new ArrayList<>();
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this.data.position(20);
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while (this.data.position() < this.data.capacity()) {
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Object next = parseNextObject(shared);
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objs.add(next);
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}
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System.out.println(shared.size());
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System.out.println(objs);
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}
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}
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public static Section findSection(Section[] sections, String name) {
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for (Section section : sections) {
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if (section.name.equals(name)) {
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return section;
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}
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}
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return null;
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}
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public static void main(String[] args) throws Exception {
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ByteBuffer buf;
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int len;
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{
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FileInputStream in = new FileInputStream(new File(args[0]));
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len = in.available();
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buf = ByteBuffer.allocate(len);
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Channels.newChannel(in).read(buf);
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}
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for (int i = 0; i < 12; i++) {
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if (buf.get(len - 12 + i) != (byte) TRAILER_MAGIC.charAt(i)) {
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throw new Exception("invalid trailer");
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}
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}
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int numSections = buf.getInt(len - 16);
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Section[] sections = new Section[numSections];
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for (int i = numSections - 1, sectionBase = len - 16 - (numSections * 8); i >= 0; i--) {
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int base = len - 16 - (numSections * 8) + (i * 8);
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char[] name = new char[4];
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name[0] = (char) buf.get(base + 0);
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name[1] = (char) buf.get(base + 1);
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name[2] = (char) buf.get(base + 2);
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name[3] = (char) buf.get(base + 3);
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int sectionLength = buf.getInt(base + 4);
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sectionBase -= sectionLength;
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byte[] data = new byte[sectionLength];
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buf.position(sectionBase);
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buf.get(data);
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sections[i] = new Section(new String(name), ByteBuffer.wrap(data));
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}
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System.out.println(Arrays.toString(sections));
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findSection(sections, "SYMB").unmarshal();
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findSection(sections, "CRCS").unmarshal();
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findSection(sections, "DATA").unmarshal();
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}
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}
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