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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 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) 2009 JRuby project Alternatively, the contents of this file may be used under the terms of 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 of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the CPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the CPL, the GPL or the LGPL. END LICENSE BLOCK ***
package org.jruby.ext.ffi;
FFI specific I/O routines
public class IOModule {
    public static void createIOModule(Ruby runtimeRubyModule ffi) {
        RubyModule module = ffi.defineModuleUnder("IO");
    @JRubyMethod(name = "native_read", module = true)
    public static final IRubyObject native_read(ThreadContext contextIRubyObject self,
            IRubyObject srcIRubyObject dstIRubyObject rbLength) {
        if (!(src instanceof RubyIO)) {
            throw context.runtime.newTypeError("wrong argument (expected IO)");
        if (!(dst instanceof AbstractMemory)) {
            throw context.runtime.newTypeError("wrong argument (expected FFI memory)");
        Ruby runtime = context.runtime;
        try {
            OpenFile openFile = ((RubyIOsrc).getOpenFile();
            ChannelStream stream = (ChannelStreamopenFile.getMainStreamSafe();
            ByteBuffer buffer = ((AbstractMemorydst).getMemoryIO().asByteBuffer();
            int count = RubyNumeric.num2int(rbLength);
            if (count > buffer.remaining()) {
                throw runtime.newIndexError("read count too big for output buffer");
            if (count < buffer.remaining()) {
                buffer = buffer.duplicate();
            return runtime.newFixnum(;
        } catch (InvalidValueException ex) {
            throw runtime.newErrnoEINVALError();
        } catch (EOFException e) {
            return runtime.newFixnum(-1);
        } catch (BadDescriptorException e) {
            throw runtime.newErrnoEBADFError();
        } catch (IOException e) {
            throw runtime.newIOErrorFromException(e);
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