pluotsorbet/override.js

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */

'use strict';

var Override = {};

function asyncImpl(returnKind, promise) {
  var ctx = $.ctx;

  promise.then(function(res) {
    if (returnKind === "J" || returnKind === "D") {
      ctx.current().stack.push2(res);
    } else if (returnKind !== "V") {
      ctx.current().stack.push(res);
    } else {
      // void, do nothing
    }
    // if (Instrument.profiling) {
    //   Instrument.exitAsyncNative(key, promise);
    // }
  }, function(exception) {
    var syntheticMethod = new MethodInfo({
      name: "RaiseExceptionSynthetic",
      signature: "()V",
      isStatic: true,
      classInfo: {
        className: "java/lang/Object",
        vmc: {},
        vfc: {},
        constant_pool: [
          null
        ]
      },
      code: new Uint8Array([
        0x2a,             // aload_0
        0xbf              // athrow
      ])
    });
    var callee = new Frame(syntheticMethod, [exception], 0);
    ctx.frames.push(callee);
  }).then(ctx.resume.bind(ctx));

  // if (Instrument.profiling) {
  //   key = ctx.current().methodInfo.implKey;
  //   Instrument.enterAsyncNative(key, promise);
  // }

  $.pause();
}

Override["com/ibm/oti/connection/file/Connection.decode.(Ljava/lang/String;)Ljava/lang/String;"] = function(string) {
  return J2ME.newString(decodeURIComponent(string.str));
};

Override["com/ibm/oti/connection/file/Connection.encode.(Ljava/lang/String;)Ljava/lang/String;"] = function(string) {
  return J2ME.newString(string.str.replace(/[^a-zA-Z0-9-_\.!~\*\\'()/:]/g, encodeURIComponent));
};

Override["java/lang/Math.min.(II)I"] = function(a, b) {
  return Math.min(a, b);
};

Override["java/io/ByteArrayOutputStream.write.([BII)V"] = function(b, off, len) {
  if ((off < 0) || (off > b.length) || (len < 0) ||
      ((off + len) > b.length)) {
    throw $.newIndexOutOfBoundsException();
  }

  if (len == 0) {
    return;
  }

  var count = this.klass.classInfo.getField("I.count.I").get(this);
  var buf = this.klass.classInfo.getField("I.buf.[B").get(this);

  var newcount = count + len;
  if (newcount > buf.length) {
    var newbuf = J2ME.newByteArray(Math.max(buf.length << 1, newcount));
    newbuf.set(buf);
    buf = newbuf;
    this.klass.classInfo.getField("I.buf.[B").set(this, buf);
  }

  buf.set(b.subarray(off, off + len), count);
  this.klass.classInfo.getField("I.count.I").set(this, newcount);
};

Override["java/io/ByteArrayOutputStream.write.(I)V"] = function(value) {
  var count = this.klass.classInfo.getField("I.count.I").get(this);
  var buf = this.klass.classInfo.getField("I.buf.[B").get(this);

  var newcount = count + 1;
  if (newcount > buf.length) {
    var newbuf = J2ME.newByteArray(Math.max(buf.length << 1, newcount));
    newbuf.set(buf);
    buf = newbuf;
    this.klass.classInfo.getField("I.buf.[B").set(this, buf);
  }

  buf[count] = value;
  this.klass.classInfo.getField("I.count.I").set(this, newcount);
};

Override["java/io/ByteArrayInputStream.<init>.([B)V"] = function(buf) {
  if (!buf) {
    throw $.newNullPointerException();
  }

  this.buf = buf;
  this.pos = this.mark = 0;
  this.count = buf.length;
};

Override["java/io/ByteArrayInputStream.<init>.([BII)V"] = function(buf, offset, length) {
  if (!buf) {
    throw $.newNullPointerException();
  }

  this.buf = buf;
  this.pos = this.mark = offset;
  this.count = (offset + length <= buf.length) ? (offset + length) : buf.length;
};

Override["java/io/ByteArrayInputStream.read.()I"] = function() {
  return (this.pos < this.count) ? (this.buf[this.pos++] & 0xFF) : -1;
};

Override["java/io/ByteArrayInputStream.read.([BII)I"] = function(b, off, len) {
  if (!b) {
    throw $.newNullPointerException();
  }

  if ((off < 0) || (off > b.length) || (len < 0) ||
      ((off + len) > b.length)) {
    throw $.newIndexOutOfBoundsException();
  }

  if (this.pos >= this.count) {
    return -1;
  }
  if (this.pos + len > this.count) {
    len = this.count - this.pos;
  }
  if (len === 0) {
    return 0;
  }

  b.set(this.buf.subarray(this.pos, this.pos + len), off);

  this.pos += len;
  return len;
};

Override["java/io/ByteArrayInputStream.skip.(J)J"] = function(long) {
  var n = long.toNumber();

  if (this.pos + n > this.count) {
    n = this.count - this.pos;
  }

  if (n < 0) {
    return Long.fromNumber(0);
  }

  this.pos += n;

  return Long.fromNumber(n);
};

Override["java/io/ByteArrayInputStream.available.()I"] = function() {
  return this.count - this.pos;
};

Override["java/io/ByteArrayInputStream.mark.(I)V"] = function(readAheadLimit) {
  this.mark = this.pos;
};

Override["java/io/ByteArrayInputStream.reset.()V"] = function() {
  this.pos = this.mark;
};

// The following Permissions methods are overriden to avoid expensive calls to
// DomainPolicy.loadValues. This has the added benefit that we avoid many other
// computations.

Override["com/sun/midp/security/Permissions.forDomain.(Ljava/lang/String;)[[B"] = function(name) {
  // NUMBER_OF_PERMISSIONS = PermissionsStrings.PERMISSION_STRINGS.length + 2
  // The 2 is the two hardcoded MIPS and AMS permissions.
  var NUMBER_OF_PERMISSIONS = 61;
  var ALLOW = 1;

  var maximums = J2ME.newByteArray(NUMBER_OF_PERMISSIONS);
  var defaults = J2ME.newByteArray(NUMBER_OF_PERMISSIONS);

  for (var i = 0; i < NUMBER_OF_PERMISSIONS; i++) {
    maximums[i] = defaults[i] = ALLOW;
  }

  var permissions = J2ME.newArray(J2ME.PrimitiveArrayClassInfo.B.klass, 2);
  permissions[0] = maximums;
  permissions[1] = defaults;

  return permissions;
};

// Always return true to make Java think the MIDlet domain is trusted.
Override["com/sun/midp/security/Permissions.isTrusted.(Ljava/lang/String;)Z"] = function(name) {
  return 1;
};

// Returns the ID of the permission. The callers will use this ID to check the
// permission in the permissions array returned by Permissions::forDomain.
Override["com/sun/midp/security/Permissions.getId.(Ljava/lang/String;)I"] = function(name) {
  return 0;
};

// The Java code that uses this method doesn't actually use the return value, but
// passes it to Permissions.getId. So we can return anything.
Override["com/sun/midp/security/Permissions.getName.(I)Ljava/lang/String;"] = function(id) {
  return J2ME.newString("com.sun.midp");
};