/* | |
* 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 "MemoryInputStream.h" | |
namespace rocketmq { | |
MemoryInputStream::MemoryInputStream(const void* const sourceData, | |
const size_t sourceDataSize, | |
const bool keepInternalCopy) | |
: data(sourceData), dataSize(sourceDataSize), position(0), internalCopy(NULL) { | |
if (keepInternalCopy) | |
createInternalCopy(); | |
} | |
MemoryInputStream::MemoryInputStream(const MemoryBlock& sourceData, const bool keepInternalCopy) | |
: data(sourceData.getData()), dataSize(sourceData.getSize()), position(0), internalCopy(NULL) { | |
if (keepInternalCopy) | |
createInternalCopy(); | |
} | |
void MemoryInputStream::createInternalCopy() { | |
std::free(internalCopy); | |
internalCopy = static_cast<char*>(std::malloc(dataSize)); | |
memcpy(internalCopy, data, dataSize); | |
data = internalCopy; | |
} | |
MemoryInputStream::~MemoryInputStream() { | |
std::free(internalCopy); | |
} | |
int64 MemoryInputStream::getTotalLength() { | |
return (int64)dataSize; | |
} | |
int MemoryInputStream::read(void* const buffer, const int howMany) { | |
const int num = std::min(howMany, (int)(dataSize - position)); | |
if (num <= 0) | |
return 0; | |
memcpy((char*)buffer, (char*)data + position, (size_t)num); | |
position += (unsigned int)num; | |
return num; | |
} | |
bool MemoryInputStream::isExhausted() { | |
return position >= dataSize; | |
} | |
bool MemoryInputStream::setPosition(const int64 pos) { | |
if (pos < 0) | |
position = 0; | |
else | |
position = (int64)dataSize < pos ? (int64)dataSize : pos; | |
return true; | |
} | |
int64 MemoryInputStream::getPosition() { | |
return (int64)position; | |
} | |
} // namespace rocketmq |