jmemoryinputstream.cpp
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/***************************************************************************
* Copyright (C) 2005 by Jeff Ferr *
* root@sat *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 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 General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "Stdafx.h"
#include "jmemoryinputstream.h"
#include "jruntimeexception.h"
namespace jio {
MemoryInputStream::MemoryInputStream(uint8_t *data, uint64_t size):
jio::InputStream()
{
jcommon::Object::SetClassName("jio::MemoryInputStream");
if ((void *)data == NULL) {
throw jcommon::RuntimeException("Null pointer exception");
}
_buffer = data;
_buffer_size = size;
_buffer_index = 0;
}
MemoryInputStream::~MemoryInputStream()
{
}
bool MemoryInputStream::IsEmpty()
{
return _buffer_size == _buffer_index;
}
int64_t MemoryInputStream::Available()
{
return _buffer_size - _buffer_index;
}
int64_t MemoryInputStream::GetSize()
{
return _buffer_size;
}
int64_t MemoryInputStream::GetPosition()
{
return _buffer_index;
}
int64_t MemoryInputStream::Read()
{
if (IsEmpty() == true) {
return -1LL;
}
return _buffer[_buffer_index++];;
}
int64_t MemoryInputStream::Read(char *data, int64_t size)
{
if ((void *)data == NULL) {
return -1LL;
}
if (IsEmpty() == true) {
return -1LL;
}
if (size > Available()) {
size = Available();
}
memcpy(data, (uint8_t *)(_buffer + _buffer_index), (uint32_t)size);
_buffer_index = _buffer_index + size;
return size;
}
void MemoryInputStream::Skip(int64_t skip)
{
_buffer_index += skip;
if (_buffer_index > Available()) {
_buffer_index = Available();
}
}
void MemoryInputStream::Reset()
{
_buffer_index = 0;
}
void MemoryInputStream::Close()
{
}
int64_t MemoryInputStream::GetReadedBytes()
{
return _buffer_index;
}
}