1 files changed, 278 insertions, 0 deletions

diff --git a/src/stable/queuebuf.cpp b/src/stable/queuebuf.cpp
new file mode 100644
index 0000000..98d8ee0
--- /dev/null
+++ b/src/stable/queuebuf.cpp
@@ -0,0 +1,278 @@
+/*
+ * Copyright (C) 2007-2011 Xagasoft, All rights reserved.
+ *
+ * This file is part of the libbu++ library and is released under the
+ * terms of the license contained in the file LICENSE.
+ */
+
+#include "bu/queuebuf.h"
+
+#include "bu/sio.h"
+using Bu::sio;
+
+Bu::QueueBuf::QueueBuf( int iBlockSize /*=256*/ ) :
+        iBlockSize( iBlockSize ),
+        iReadOffset( 0 ),
+        iWriteOffset( 0 ),
+        iTotalSize( 0 )
+{
+}
+
+Bu::QueueBuf::~QueueBuf()
+{
+        for( BlockList::iterator i = lBlocks.begin(); i; i++ )
+                delete[] *i;
+}
+
+void Bu::QueueBuf::close()
+{
+        for( BlockList::iterator i = lBlocks.begin(); i; i++ )
+                delete[] *i;
+        lBlocks.clear();
+        iReadOffset = iWriteOffset = iTotalSize = 0;
+}
+
+Bu::size Bu::QueueBuf::read( void *pRawBuf, Bu::size nBytes )
+{
+        if( nBytes <= 0 )
+                return 0;
+
+        if( lBlocks.isEmpty() )
+                return 0;
+
+        Bu::size iLeft = nBytes;
+        char *pBuf = (char *)pRawBuf;
+
+        while( iLeft > 0 && iTotalSize > 0 )
+        {
+                if( iReadOffset == iBlockSize )
+                {
+                        removeBlock();
+                        if( lBlocks.isEmpty() )
+                        {
+                                return nBytes-iLeft;
+                        }
+                        iReadOffset = 0;
+                }
+                char *pBlock = lBlocks.first();
+                Bu::size iCopy = iBlockSize-iReadOffset;
+                if( iLeft < iCopy )
+                        iCopy = iLeft;
+                if( iTotalSize < iCopy )
+                        iCopy = iTotalSize;
+                memcpy( pBuf, pBlock+iReadOffset, iCopy );
+                iReadOffset += iCopy;
+                iLeft -= iCopy;
+                pBuf += iCopy;
+                iTotalSize -= iCopy;
+//              sio << "Read " << iCopy << " bytes, new size: " << iTotalSize << sio.nl;
+        }
+
+        return nBytes - iLeft;
+}
+
+Bu::size Bu::QueueBuf::peek( void *pBuf, Bu::size nBytes )
+{
+        return peek( pBuf, nBytes, 0 );
+}
+
+Bu::size Bu::QueueBuf::peek( void *pRawBuf, Bu::size nBytes, Bu::size nSkip )
+{
+        if( nBytes <= 0 )
+                return 0;
+
+        if( lBlocks.isEmpty() )
+                return 0;
+
+        Bu::size iLeft = nBytes;
+        char *pBuf = (char *)pRawBuf;
+
+        int iTmpReadOffset = iReadOffset + nSkip;
+        Bu::size iTmpRemSize = iTotalSize;
+        BlockList::iterator iBlock = lBlocks.begin();
+        while( iTmpReadOffset > iBlockSize )
+        {
+                iTmpReadOffset -= iBlockSize;
+                iBlock++;
+        }
+        while( iLeft > 0 && iTmpRemSize > 0 )
+        {
+                if( iTmpReadOffset == iBlockSize )
+                {
+                        iBlock++;
+                        if( iBlock == lBlocks.end() )
+                        {
+                                return nBytes-iLeft;
+                        }
+                        iTmpReadOffset = 0;
+                }
+                char *pBlock = *iBlock;
+                Bu::size iCopy = iBlockSize-iTmpReadOffset;
+                if( iLeft < iCopy )
+                        iCopy = iLeft;
+                if( iTmpRemSize < iCopy )
+                        iCopy = iTmpRemSize;
+                memcpy( pBuf, pBlock+iTmpReadOffset, iCopy );
+                iTmpReadOffset += iCopy;
+                iLeft -= iCopy;
+                pBuf += iCopy;
+                iTmpRemSize -= iCopy;
+//              sio << "Read (peek) " << iCopy << " bytes, new temp size: "
+//                      << iTmpRemSize << sio.nl;
+        }
+
+        return nBytes - iLeft;
+}
+
+Bu::size Bu::QueueBuf::write( const void *pRawBuf, Bu::size nBytes )
+{
+        if( nBytes <= 0 )
+                return 0;
+
+        if( lBlocks.isEmpty() )
+        {
+                addBlock();
+                iWriteOffset = 0;
+        }
+        Bu::size iLeft = nBytes;
+        const char *pBuf = (const char *)pRawBuf;
+
+        while( iLeft > 0 )
+        {
+                if( iWriteOffset == iBlockSize )
+                {
+                        addBlock();
+                        iWriteOffset = 0;
+                }
+                char *pBlock = lBlocks.last();
+                Bu::size iCopy = iBlockSize-iWriteOffset;
+                if( iLeft < iCopy )
+                        iCopy = iLeft;
+                memcpy( pBlock+iWriteOffset, pBuf, iCopy );
+                iWriteOffset += iCopy;
+                iLeft -= iCopy;
+                pBuf += iCopy;
+                iTotalSize += iCopy;
+//              sio << "Wrote " << iCopy << " bytes, new size: " << iTotalSize
+//                      << sio.nl;
+        }
+
+        return nBytes;
+}
+
+Bu::size Bu::QueueBuf::tell()
+{
+        return -1;
+}
+
+void Bu::QueueBuf::seek( Bu::size iAmnt )
+{
+        if( iAmnt <= 0 )
+                return;
+
+        if( (Bu::size)iAmnt >= iTotalSize )
+        {
+//              sio << "seek: clear all data (" << iAmnt << ">=" << iTotalSize
+//                      << ")." << sio.nl;
+                close();
+                return;
+        }
+
+        iReadOffset += iAmnt;
+        iTotalSize -= iAmnt;
+        while( iReadOffset >= iBlockSize )
+        {
+                removeBlock();
+                iReadOffset -= iBlockSize;
+//              sio << "seek: removal step (" << iReadOffset << ")" << sio.nl;
+        }
+}
+
+void Bu::QueueBuf::setPos( Bu::size )
+{
+}
+
+void Bu::QueueBuf::setPosEnd( Bu::size )
+{
+}
+
+bool Bu::QueueBuf::isEos()
+{
+        return iTotalSize == 0;
+}
+
+bool Bu::QueueBuf::isOpen()
+{
+        return true;
+}
+
+void Bu::QueueBuf::flush()
+{
+}
+
+bool Bu::QueueBuf::canRead()
+{
+        return iTotalSize > 0;
+}
+
+bool Bu::QueueBuf::canWrite()
+{
+        return true;
+}
+
+bool Bu::QueueBuf::isReadable()
+{
+        return true;
+}
+
+bool Bu::QueueBuf::isWritable()
+{
+        return true;
+}
+
+bool Bu::QueueBuf::isSeekable()
+{
+        return false;
+}
+
+bool Bu::QueueBuf::isBlocking()
+{
+        return false;
+}
+
+void Bu::QueueBuf::setBlocking( bool )
+{
+}
+
+void Bu::QueueBuf::setSize( Bu::size )
+{
+}
+
+Bu::size Bu::QueueBuf::getSize() const
+{
+        return iTotalSize;
+}
+
+Bu::size Bu::QueueBuf::getBlockSize() const
+{
+        return iBlockSize;
+}
+
+Bu::String Bu::QueueBuf::getLocation() const
+{
+        return "";
+}
+
+void Bu::QueueBuf::addBlock()
+{
+        lBlocks.append( new char[iBlockSize] );
+//      sio << "Added new block." << sio.nl;
+}
+
+void Bu::QueueBuf::removeBlock()
+{
+        delete[] lBlocks.first();
+        lBlocks.erase( lBlocks.begin() );
+//      sio << "Removed block." << sio.nl;
+}
+