/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2008 JRuby project
*
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* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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package org.jruby.ext.ffi;
import java.nio.ByteBuffer;
import org.jruby.Ruby;
import org.jruby.RubyNumeric;
import org.jruby.RubyString;
import org.jruby.javasupport.JavaObject;
import org.jruby.javasupport.JavaUtil;
import org.jruby.runtime.builtin.IRubyObject;
/**
*
*/
public final class Util {
private Util() {}
public static final byte int8Value(IRubyObject parameter) {
final long value = longValue(parameter);
if (value < Byte.MIN_VALUE || value > Byte.MAX_VALUE) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside char range");
}
return (byte) value;
}
public static final short uint8Value(IRubyObject parameter) {
final long value = longValue(parameter);
if (value < 0 || value > 0xffL) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside unsigned char range");
}
return (short) value;
}
public static final short int16Value(IRubyObject parameter) {
final long value = longValue(parameter);
if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside short range");
}
return (short) value;
}
public static final int uint16Value(IRubyObject parameter) {
final long value = longValue(parameter);
if (value < 0 || value > 0xffffL) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside unsigned short range");
}
return (int) value;
}
public static final int int32Value(IRubyObject parameter) {
final long value = longValue(parameter);
if (value < Integer.MIN_VALUE || value > 0xffffffffL) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside integer range");
}
// This also handles unsigned int -> negative signed int conversion
return (int) value;
}
public static final long uint32Value(IRubyObject parameter) {
final long value = longValue(parameter);
if (value < 0 || value > 0xffffffffL) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside unsigned integer range");
}
return value;
}
public static final long int64Value(IRubyObject parameter) {
return longValue(parameter);
}
public static final long uint64Value(IRubyObject parameter) {
final long value = longValue(parameter);
if (value < 0) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside unsigned long long range");
}
return value;
}
public static final float floatValue(IRubyObject parameter) {
final double value = RubyNumeric.num2dbl(parameter);
if (value < Float.MIN_VALUE || value > Float.MAX_VALUE) {
throw parameter.getRuntime().newRangeError("Value "
+ value + " outside float range");
}
return (float) value;
}
public static final double doubleValue(IRubyObject parameter) {
return RubyNumeric.num2dbl(parameter);
}
/**
* Converts characters like 'a' or 't' to an integer value
*
* @param parameter
* @return
*/
public static final long longValue(IRubyObject parameter) {
if (parameter instanceof RubyNumeric) {
return ((RubyNumeric) parameter).getLongValue();
} else if (parameter.isNil()) {
return 0L;
} else if (parameter instanceof RubyString) {
return longValue((RubyString) parameter);
}
throw parameter.getRuntime().newRangeError("Value "
+ parameter + " is not an integer");
}
private static final long longValue(RubyString parameter) {
CharSequence cs = parameter.asJavaString();
if (cs.length() == 1) {
return cs.charAt(0);
}
throw parameter.getRuntime().newRangeError("Value "
+ parameter + " is not an integer");
}
public static final IRubyObject newUnsigned8(Ruby runtime, int value) {
return newUnsigned32(runtime, value);
}
public static final IRubyObject newUnsigned16(Ruby runtime, int value) {
return newUnsigned32(runtime, value);
}
public static final IRubyObject newUnsigned32(Ruby runtime, int value) {
return runtime.newFixnum(value < 0 ? (long)((value & 0x7FFFFFFFL) + 0x80000000L) : value);
}
public static final IRubyObject newUnsigned64(Ruby runtime, long value) {
return runtime.newFixnum(value);
}
public static final <T> T convertParameter(IRubyObject parameter, Class<T> paramClass) {
return paramClass.cast(parameter instanceof JavaObject
? ((JavaObject) parameter).getValue()
: JavaUtil.convertRubyToJava(parameter, paramClass));
}
public static final ByteBuffer slice(ByteBuffer buf, int offset) {
ByteBuffer tmp = buf.duplicate();
tmp.position((int) offset);
return tmp.slice();
}
}