/*
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <string.h>
#include <log4cxx/logstring.h>
#include <log4cxx/helpers/inputstreamreader.h>
#include <log4cxx/helpers/exception.h>
#include <log4cxx/helpers/pool.h>
#include <log4cxx/helpers/bytebuffer.h>

using namespace log4cxx;
using namespace log4cxx::helpers;

IMPLEMENT_LOG4CXX_OBJECT(InputStreamReader)

InputStreamReader::InputStreamReader(const InputStreamPtr& in1)
   : in(in1), dec(CharsetDecoder::getDefaultDecoder()) {
   if (in1 == 0) {
      throw NullPointerException(LOG4CXX_STR("in parameter may not be null."));
   }
}

InputStreamReader::InputStreamReader(const InputStreamPtr& in1, const CharsetDecoderPtr &dec1) 
    : in(in1), dec(dec1) {
    if (in1 == 0) {
       throw NullPointerException(LOG4CXX_STR("in parameter may not be null."));
    }
    if (dec1 == 0) {
       throw NullPointerException(LOG4CXX_STR("dec parameter may not be null."));
    }
}

InputStreamReader::~InputStreamReader() {
}

void InputStreamReader::close(Pool& ) {
  in->close();
}

LogString InputStreamReader::read(Pool& p) {
    const size_t BUFSIZE = 4096;
    ByteBuffer buf(p.pstralloc(BUFSIZE), BUFSIZE);
    LogString output;

    // read whole file
    while(in->read(buf) >= 0) {
         buf.flip();
         log4cxx_status_t stat = dec->decode(buf, output);
         if (stat != 0) {
             throw IOException(stat);
         }
         if (buf.remaining() > 0) {
             memmove(buf.data(), buf.current(), buf.remaining());
             buf.limit(buf.remaining());
         } else {
             buf.clear();
         }
    }

    return output;
}