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