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Copy pathsynchronizedFileBuffer.cpp
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Copy pathsynchronizedFileBuffer.cpp
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executable file
·252 lines (206 loc) · 6.15 KB
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/*
*****************************************************************************
* Copyright (C) 2012 - 2014 Institute of Information Technology,
* Alpen-Adria-Universität Klagenfurt
*
* Created on: May 20, 2014
* Authors: Benjamin Rainer <benjamin.rainer@itec.aau.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#if (defined WIN32 || WIN64)
#include <Windows.h>
#else
#include <pthread.h>
#endif
#include "synchronizedFileBuffer.h"
synchronizedFileBuffer::synchronizedFileBuffer(int32_t fd)
{
this->fd = new fdinout(fd);
this->init();
}
synchronizedFileBuffer::synchronizedFileBuffer(std::string fileName)
{
this->type = type;
this->fd = new fdinout(fileName);
this->init();
}
synchronizedFileBuffer::~synchronizedFileBuffer()
{
mutex_destroy(bufferMutex);
if(fd != NULL) delete fd;
if(mem != NULL) free(mem);
}
void synchronizedFileBuffer::init()
{
bufferMutex = mutex_create(false);
size = BUFFER_DEFAULT_SIZE;
mem = (uint8_t *) calloc(sizeof(uint8_t), size); // will init 32k
offset = 0;
realOffset = 0;
bytesLeft = 0;
eof = false;
peekCausedRewind = false;
uid = *(uint32_t *)(this);
}
uint32_t synchronizedFileBuffer::write(chunk *c, uint32_t additionalOffset, uint32_t len)
{
int32_t ret;
ret = fd->get(mem + ((offset + additionalOffset) % size), len);
if(ret <= 0)
{
if(ret == _ERR_READING_FROM_FD) mde_log(MDE_LOG_ERROR, "synchronizedFileBuffer: Error reading from FD.\n");
if(ret == _ERR_INVALID_FD) mde_log(MDE_LOG_ERROR, "synchronizedFileBuffer: Error invalid FD.\n");
if(ret == _ERR_EOF) mde_log(MDE_LOG_DEBUG, "synchronizedFileBuffer: reached end of file.\n");
this->setEOF();
return 0;
}
bytesLeft += len;
return (uint32_t)ret;
}
uint32_t synchronizedFileBuffer::write(chunk *c, uint32_t len)
{
int32_t ret = 0;
ret = fd->get(mem + (offset % size), len);
if(ret <= 0)
{
if(ret == _ERR_READING_FROM_FD) mde_log(MDE_LOG_ERROR, "synchronizedFileBuffer: Error reading from FD.\n");
if(ret == _ERR_INVALID_FD) mde_log(MDE_LOG_ERROR, "synchronizedFileBuffer: Error invalid FD.\n");
if(ret == _ERR_EOF) mde_log(MDE_LOG_DEBUG, "synchronizedFileBuffer: reached end of file.\n");
this->setEOF();
return 0;
}
bytesLeft += len;
return (uint32_t)ret;
}
uint32_t synchronizedFileBuffer::read(chunk *c, uint32_t len)
{
uint32_t ret;
mutex_lock(bufferMutex);
/* be aware of the max read */
if(((offset % size) + len > size)) len = (size - (offset % size));
if(bytesLeft <= 0 && !eof)
{
if( this->write(NULL, len) == 0);
{
mutex_unlock(bufferMutex);
return 0;
}
}
if(bytesLeft <= 0 && eof)
{
mutex_unlock(bufferMutex);
return 0;
}
ret = (len > bytesLeft ? bytesLeft : len);
c->append(mem + (offset % size), ret);
offset += ret;
bytesLeft -= ret;
realOffset += ret;
mutex_unlock(bufferMutex);
return ret;
}
uint32_t synchronizedFileBuffer::digest(uint32_t len)
{
uint32_t readBytes = 0, ret=0;
while(readBytes < len){
chunk *c = new chunk(((len - readBytes) > size ? size : (len - readBytes)), false);
ret = read(c, c->getSize());
if(ret == 0 && eof) return readBytes;
readBytes += ret;
delete c;
};
return readBytes;
}
chunk *synchronizedFileBuffer::read(uint32_t len)
{
uint32_t readBytes = 0, ret=0;
chunk *c = new chunk(len, false);
while(readBytes < len){
ret = read(c, len - readBytes);
readBytes += ret;
if (eof && ret==0)
{
break;
}
};
return c;
}
uint32_t synchronizedFileBuffer::peek(chunk *c, uint32_t peekOffset, uint32_t len)
{
uint32_t ret;
mutex_lock(bufferMutex);
if((((offset + peekOffset) % size) + len > size)) len = (size - ((offset + peekOffset) % size));
if((bytesLeft - peekOffset) <= 0 && !eof)
{
if(write(NULL, peekOffset, len) == 0)
{
mutex_unlock(bufferMutex);
return 0;
}
}
if((bytesLeft - peekOffset) <= 0 && eof)
{
mutex_unlock(bufferMutex);
return 0;
}
if( peekCausedRewind ) peekOffset = 0;
ret = (len > (bytesLeft - peekOffset) ? (bytesLeft - peekOffset) : len);
c->append(mem + ((offset + peekOffset) % size), ret);
mutex_unlock(bufferMutex);
return ret;
}
uint32_t synchronizedFileBuffer::peek(uint8_t *data, uint32_t len)
{
uint32_t readBytes = 0, ret=0;
chunk *c = new chunk(len, false);
while(readBytes < len){
ret = peek(c, readBytes, len - readBytes);
readBytes += ret;
if (eof && ret==0)
{
break;
}
};
memcpy(data, c->getPointer(), readBytes);
delete c;
return readBytes;
}
chunk *synchronizedFileBuffer::read(uint32_t offset, uint32_t len)
{
return NULL; // not supported
}
void synchronizedFileBuffer::setEOF()
{
eof = true;
}
bool synchronizedFileBuffer::isEOF()
{
return eof;
}
uint64_t synchronizedFileBuffer::getOffset()
{
return realOffset;
}
uint32_t synchronizedFileBuffer::bufferedBytes()
{
return bytesLeft;
}
void synchronizedFileBuffer::notify()
{
}
void synchronizedFileBuffer::attach(IBufferObserver* observer)
{
}