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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
*/
#include <java/io/Reader.hxx>
#include <string.h>
#include <osl/diagnose.h>
using namespace connectivity;
using ::com::sun::star::uno::Sequence;
//************ Class: java.io.Reader
jclass java_io_Reader::theClass = nullptr;
java_io_Reader::java_io_Reader( JNIEnv * pEnv, jobject myObj )
: java_lang_Object( pEnv, myObj )
{
SDBThreadAttach::addRef();
}
java_io_Reader::~java_io_Reader()
{
SDBThreadAttach::releaseRef();
}
jclass java_io_Reader::getMyClass() const
{
// the class must be fetched only once, therefore static
if( !theClass )
theClass = findMyClass("java/io/Reader");
return theClass;
}
sal_Int32 SAL_CALL java_io_Reader::readSomeBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
{
return readBytes(aData,nMaxBytesToRead);
}
void SAL_CALL java_io_Reader::skipBytes( sal_Int32 nBytesToSkip )
{
static jmethodID mID(nullptr);
if(nBytesToSkip <= 0)
return;
if(m_buf)
{
m_buf.reset();
--nBytesToSkip;
}
static_assert(sizeof(jchar) == 2, "I thought Java characters were UTF16 code units?");
sal_Int32 nCharsToSkip = nBytesToSkip / sizeof(jchar);
callIntMethodWithIntArg_ThrowRuntime("skip",mID,nCharsToSkip);
if(nBytesToSkip % sizeof(jchar) != 0)
{
assert(nBytesToSkip % sizeof(jchar) == 1);
Sequence< sal_Int8 > aData(1);
assert(m_buf);
readBytes(aData, 1);
}
}
sal_Int32 SAL_CALL java_io_Reader::available( )
{
if(m_buf)
return 1;
bool out;
SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");
{
static const char * const cSignature = "()Z";
static const char * const cMethodName = "ready";
// Java-Call
static jmethodID mID(nullptr);
obtainMethodId_throwRuntime(t.pEnv, cMethodName,cSignature, mID);
out = t.pEnv->CallBooleanMethod( object, mID);
ThrowRuntimeException(t.pEnv,*this);
} //t.pEnv
return (m_buf ? 1 : 0) + (out ? 1 : 0); // no way to tell *how much* is ready
}
void SAL_CALL java_io_Reader::closeInput( )
{
static jmethodID mID(nullptr);
callVoidMethod_ThrowRuntime("close", mID);
}
sal_Int32 SAL_CALL java_io_Reader::readBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
{
OSL_ENSURE(aData.getLength() >= nBytesToRead," Sequence is smaller than BytesToRead");
if(nBytesToRead == 0)
return 0;
sal_Int8 *dst(aData.getArray());
sal_Int32 nBytesWritten(0);
if (m_buf)
{
if(!aData.hasElements())
{
aData.realloc(1);
dst = aData.getArray();
}
*dst = *m_buf;
m_buf.reset();
++nBytesWritten;
++dst;
--nBytesToRead;
}
if(nBytesToRead == 0)
return nBytesWritten;
sal_Int32 nCharsToRead = (nBytesToRead + 1)/2;
SDBThreadAttach t; OSL_ENSURE(t.pEnv,"Java environment has been deleted!");
{
jcharArray pCharArray = t.pEnv->NewCharArray(nCharsToRead);
static const char * const cSignature = "([CII)I";
static const char * const cMethodName = "read";
// Java-Call
static jmethodID mID(nullptr);
obtainMethodId_throwRuntime(t.pEnv, cMethodName,cSignature, mID);
jint outChars = t.pEnv->CallIntMethod( object, mID, pCharArray, 0, nCharsToRead );
if ( !outChars )
{
if(nBytesWritten==0)
ThrowRuntimeException(t.pEnv,*this);
else
return 1;
}
if(outChars > 0)
{
static_assert(sizeof(jchar) == 2, "I thought Java characters were UTF16 code units?");
const sal_Int32 jcs = sizeof(jchar);
const sal_Int32 outBytes = std::min(nBytesToRead, outChars*jcs);
assert(outBytes == outChars*jcs || outBytes == outChars*jcs - 1);
jboolean p = JNI_FALSE;
if(aData.getLength() < nBytesWritten + outBytes)
{
aData.realloc(nBytesWritten + outBytes);
dst = aData.getArray() + nBytesWritten;
}
jchar *outBuf(t.pEnv->GetCharArrayElements(pCharArray,&p));
memcpy(dst, outBuf, outBytes);
nBytesWritten += outBytes;
if(outBytes < outChars*jcs)
{
assert(outChars*jcs - outBytes == 1);
assert(!m_buf);
m_buf = reinterpret_cast<char*>(outBuf)[outBytes];
}
}
t.pEnv->DeleteLocalRef(pCharArray);
} //t.pEnv
return nBytesWritten;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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