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view deps/Platinum/Source/Core/PltStreamPump.cpp @ 0:3425707ddbf6
Initial import (hopefully this mercurial stuff works...)
author | fraserofthenight |
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date | Mon, 06 Jul 2009 08:06:28 -0700 |
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/***************************************************************** | | Platinum - Stream Pump | | Copyright (c) 2004-2008, 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. | | 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 "PltStreamPump.h" #include "NptUtils.h" /*---------------------------------------------------------------------- | PLT_StreamPump::PLT_StreamPump +---------------------------------------------------------------------*/ PLT_StreamPump::PLT_StreamPump(NPT_Size size) : m_TotalBytesRead(0), m_TotalBytesWritten(0) { m_RingBuffer = new NPT_RingBuffer(size); } /*---------------------------------------------------------------------- | PLT_StreamPump::~PLT_StreamPump +---------------------------------------------------------------------*/ PLT_StreamPump::~PLT_StreamPump() { delete m_RingBuffer; } /*----------------------------------------------------------------------+ | PLT_StreamPump::PushData +----------------------------------------------------------------------*/ NPT_Result PLT_StreamPump::PushData(NPT_OutputStream& output, NPT_Size& bytes_written) { NPT_Result res = NPT_ERROR_WOULD_BLOCK; NPT_Size count = 0; NPT_Size bytes_available = m_RingBuffer->GetContiguousAvailable(); bytes_written = 0; if (bytes_available) { res = output.Write(m_RingBuffer->GetReadPointer(), bytes_available, &count); m_RingBuffer->MoveOut(count); bytes_written += count; // check if we wrapped around bytes_available = m_RingBuffer->GetContiguousAvailable(); if (NPT_SUCCEEDED(res) && bytes_available) { res = output.Write(m_RingBuffer->GetReadPointer(), bytes_available, &count); m_RingBuffer->MoveOut(count); bytes_written += count; } } m_TotalBytesWritten += bytes_written; return res; } /*----------------------------------------------------------------------+ | PLT_StreamPump::PullData +----------------------------------------------------------------------*/ NPT_Result PLT_StreamPump::PullData(NPT_InputStream& input, NPT_Size max_bytes_to_read) { NPT_Result res = NPT_ERROR_WOULD_BLOCK; NPT_Size byte_space = m_RingBuffer->GetContiguousSpace(); // check that there is space left // make sure we don't read more than our contiguous space NPT_Size nb_to_read = (max_bytes_to_read<byte_space)?max_bytes_to_read:byte_space; if (nb_to_read > 0) { NPT_Size count; res = input.Read(m_RingBuffer->GetWritePointer(), nb_to_read, &count); m_RingBuffer->MoveIn(count); max_bytes_to_read -= count; m_TotalBytesRead += count; byte_space = m_RingBuffer->GetContiguousSpace(); nb_to_read = (max_bytes_to_read<byte_space)?max_bytes_to_read:byte_space; // if we filled our contiguous space, and we wrapped, check if there is more to read if (NPT_SUCCEEDED(res) && (nb_to_read > 0)) { res = input.Read(m_RingBuffer->GetWritePointer(), nb_to_read, &count); m_RingBuffer->MoveIn(count); m_TotalBytesRead += count; } } return res; } /*---------------------------------------------------------------------- | PLT_PipeInputStreamPump::PLT_PipeInputStreamPump +---------------------------------------------------------------------*/ PLT_PipeInputStreamPump::PLT_PipeInputStreamPump(NPT_OutputStreamReference& output, NPT_Size size) : PLT_StreamPump(size), m_Output(output), m_LastRes(NPT_SUCCESS) { } /*---------------------------------------------------------------------- | PLT_PipeInputStreamPump::~PLT_PipeInputStreamPump +---------------------------------------------------------------------*/ PLT_PipeInputStreamPump::~PLT_PipeInputStreamPump() { } /*---------------------------------------------------------------------- | PLT_PipeInputStreamPump::Receive +---------------------------------------------------------------------*/ NPT_Result PLT_PipeInputStreamPump::Receive(NPT_InputStream& input, NPT_Size max_bytes_to_read, NPT_Size* bytes_read) { NPT_Size count; NPT_Result res; if ((m_LastRes == NPT_SUCCESS) || (m_LastRes == NPT_ERROR_WOULD_BLOCK)) { // look at what we have buffered already from out input // and if have less than what was asked, read more NPT_Size available = m_RingBuffer->GetAvailable(); if (available < max_bytes_to_read) { m_LastRes = PullData(input, max_bytes_to_read-available); } } else if (!m_RingBuffer->GetAvailable()) { // if the buffer is now empty, return the input last error return m_LastRes; } // write as much as we can on the output stream res = PushData(*m_Output, count); if (bytes_read) *bytes_read = count; return res; } /*---------------------------------------------------------------------- | PLT_PipeOutputStreamPump::PLT_PipeOutputStreamPump +---------------------------------------------------------------------*/ PLT_PipeOutputStreamPump::PLT_PipeOutputStreamPump(NPT_InputStreamReference& input, NPT_Size size /* 65535 */, NPT_Size max_bytes_to_read /* = 0 */) : PLT_StreamPump(size), m_Input(input), m_MaxBytesToRead(max_bytes_to_read), m_LastRes(NPT_SUCCESS) { } /*---------------------------------------------------------------------- | PLT_PipeOutputStreamPump::~PLT_PipeOutputStreamPump +---------------------------------------------------------------------*/ PLT_PipeOutputStreamPump::~PLT_PipeOutputStreamPump() { } /*---------------------------------------------------------------------- | PLT_PipeOutputStreamPump::Transmit +---------------------------------------------------------------------*/ NPT_Result PLT_PipeOutputStreamPump::Transmit(NPT_OutputStream& output) { NPT_Size count; NPT_Result res; if ((m_LastRes == NPT_SUCCESS) || (m_LastRes == NPT_ERROR_WOULD_BLOCK)) { // fill the entire space by default NPT_Size max_space = m_RingBuffer->GetSpace(); if (max_space) { NPT_Size max_to_read = max_space; if (m_MaxBytesToRead != 0) { // if a total maximum amount was set, make sure we don't read more max_to_read = ((m_MaxBytesToRead - m_TotalBytesRead) < max_space) ? (m_MaxBytesToRead - m_TotalBytesRead) : max_space; } // any data to read if (max_to_read) { m_LastRes = PullData(*m_Input, max_to_read); } else { m_LastRes = NPT_ERROR_EOS; } } } else if (!m_RingBuffer->GetAvailable()) { // if the buffer is now empty, return the input last error return m_LastRes; } // write as much as we can on the output stream res = PushData(output, count); return res; }