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|
/*****************************************************************
|
| Platinum - Ring Buffer Stream
|
| Copyright (c) 2004-2010, Plutinosoft, LLC.
| All rights reserved.
| http://www.plutinosoft.com
|
| 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.
|
| OEMs, ISVs, VARs and other distributors that combine and
| distribute commercially licensed software with Platinum software
| and do not wish to distribute the source code for the commercially
| licensed software under version 2, or (at your option) any later
| version, of the GNU General Public License (the "GPL") must enter
| into a commercial license agreement with Plutinosoft, LLC.
| licensing@plutinosoft.com
|
| 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; see the file LICENSE.txt. If not, write to
| the Free Software Foundation, Inc.,
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
| http://www.gnu.org/licenses/gpl-2.0.html
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "PltRingBufferStream.h"
#include "Neptune.h"
/*----------------------------------------------------------------------
| defines
+---------------------------------------------------------------------*/
#ifdef max
#undef max
#endif
#define max(a,b) (((a) > (b)) ? (a) : (b))
#ifdef min
#undef min
#endif
#define min(a,b) (((a) < (b)) ? (a) : (b))
/*----------------------------------------------------------------------
| PLT_RingBufferStream::PLT_RingBufferStream
+---------------------------------------------------------------------*/
PLT_RingBufferStream::PLT_RingBufferStream(NPT_Size buffer_size,
bool blocking /* = true */) :
m_TotalBytesRead(0),
m_TotalBytesWritten(0),
m_Blocking(blocking),
m_Eos(false),
m_Aborted(false)
{
m_RingBuffer = new NPT_RingBuffer(buffer_size);
}
/*----------------------------------------------------------------------
| PLT_RingBufferStream::PLT_RingBufferStream
+---------------------------------------------------------------------*/
PLT_RingBufferStream::PLT_RingBufferStream(NPT_RingBufferReference& buffer,
bool blocking /* = true */) :
m_RingBuffer(buffer),
m_TotalBytesRead(0),
m_TotalBytesWritten(0),
m_Blocking(blocking),
m_Eos(false),
m_Aborted(false)
{
}
/*----------------------------------------------------------------------
| PLT_RingBufferStream::~PLT_RingBufferStream
+---------------------------------------------------------------------*/
PLT_RingBufferStream::~PLT_RingBufferStream()
{
}
/*----------------------------------------------------------------------
| PLT_RingBufferStream::Read
+---------------------------------------------------------------------*/
NPT_Result
PLT_RingBufferStream::Read(void* buffer,
NPT_Size max_bytes_to_read,
NPT_Size* _bytes_read /*= NULL*/)
{
NPT_Size bytes_to_read;
NPT_Size bytes_read = 0;
// reset output param first
if (_bytes_read) *_bytes_read = 0;
// wait for data
do {
{
NPT_AutoLock autoLock(m_Lock);
if (m_Aborted) {
return NPT_ERROR_INTERRUPTED;
}
// check for data
if (m_RingBuffer->GetAvailable())
break;
if (m_Eos) {
return NPT_ERROR_EOS;
} else if (!m_Blocking) {
return NPT_ERROR_WOULD_BLOCK;
}
}
// sleep and try again
NPT_System::Sleep(NPT_TimeInterval(.1));
} while (1);
{
NPT_AutoLock autoLock(m_Lock);
// try twice in case available data was not contiguous
for (int i=0; i<2; i++) {
bytes_to_read = min(max_bytes_to_read - bytes_read, m_RingBuffer->GetContiguousAvailable());
// break if nothing to read the second time
if (bytes_to_read == 0) break;
// read into buffer and advance
NPT_CHECK(m_RingBuffer->Read((unsigned char*)buffer+bytes_read, bytes_to_read));
// keep track of the total bytes we have read so far
m_TotalBytesRead += bytes_to_read;
bytes_read += bytes_to_read;
if (_bytes_read) *_bytes_read += bytes_to_read;
}
}
// we have read some chars, so return success
// even if we have read less than asked
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| PLT_RingBufferStream::Write
+---------------------------------------------------------------------*/
NPT_Result
PLT_RingBufferStream::Write(const void* buffer,
NPT_Size max_bytes_to_write,
NPT_Size* _bytes_written /*= NULL*/)
{
NPT_Size bytes_to_write;
NPT_Size bytes_written = 0;
// reset output param first
if (_bytes_written) *_bytes_written = 0;
// wait for space
do {
{
NPT_AutoLock autoLock(m_Lock);
if (m_Aborted) {
return NPT_ERROR_INTERRUPTED;
}
// return immediately if we are told we're finished
if (m_Eos) {
return NPT_ERROR_EOS;
}
if (m_RingBuffer->GetSpace())
break;
if (!m_Blocking) {
return NPT_ERROR_WOULD_BLOCK;
}
}
// sleep and try again
NPT_System::Sleep(NPT_TimeInterval(.1));
} while (1);
{
NPT_AutoLock autoLock(m_Lock);
// try twice in case available space was not contiguous
for (int i=0; i<2; i++) {
bytes_to_write = min(max_bytes_to_write - bytes_written, m_RingBuffer->GetContiguousSpace());
// break if no space to write the second time
if (bytes_to_write == 0) break;
// write into buffer
NPT_CHECK(m_RingBuffer->Write((unsigned char*)buffer+bytes_written, bytes_to_write));
m_TotalBytesWritten += bytes_to_write;
bytes_written += bytes_to_write;
if (_bytes_written) *_bytes_written += bytes_to_write;
}
}
// we have written some chars, so return success
// even if we have written less than provided
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| PLT_RingBufferStream::Flush
+---------------------------------------------------------------------*/
NPT_Result
PLT_RingBufferStream::Flush()
{
NPT_AutoLock autoLock(m_Lock);
m_RingBuffer->Flush();
m_TotalBytesRead = 0;
m_TotalBytesWritten = 0;
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| PLT_RingBufferStream::SetEOS
+---------------------------------------------------------------------*/
NPT_Result
PLT_RingBufferStream::SetEOS()
{
NPT_AutoLock autoLock(m_Lock);
m_Eos = true;
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| PLT_RingBufferStream::Abort
+---------------------------------------------------------------------*/
NPT_Result
PLT_RingBufferStream::Abort()
{
NPT_AutoLock autoLock(m_Lock);
m_Aborted = true;
return NPT_SUCCESS;
}
|
