VectorIO.h

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/*
 * Copyright (c) 2005 Palmsource, Inc.
 * 
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.openbinder.org/license.html.
 * 
 * This software consists of voluntary contributions made by many
 * individuals. For the exact contribution history, see the revision
 * history and logs, available at http://www.openbinder.org
 */

#ifndef _SUPPORT_VECTORIO_H
#define _SUPPORT_VECTORIO_H

#include <support/SupportDefs.h>

#include <sys/uio.h>

#if _SUPPORTS_NAMESPACE
namespace palmos {
namespace support {
#endif

/*--------------------------------------------------------*/
/*----- SVectorIO class ----------------------------------*/

class SVectorIO
{
public:
                        SVectorIO();
virtual                 ~SVectorIO();

        const iovec*    Vectors() const;
inline                  operator const iovec*() const           { return Vectors(); }

        ssize_t         CountVectors() const;
        size_t          DataLength() const;
        
        ssize_t         AddVector(void* base, size_t length);
        ssize_t         AddVector(const iovec* vector, size_t count = 1);
        void*           Allocate(size_t length);
        
        void            MakeEmpty();
        void            SetError(status_t err);
        
        ssize_t         Write(void* buffer, size_t avail) const;
        ssize_t         Read(const void* buffer, size_t avail) const;
        
private:

virtual status_t        _ReservedVectorIO1();
virtual status_t        _ReservedVectorIO2();
virtual status_t        _ReservedVectorIO3();
virtual status_t        _ReservedVectorIO4();
virtual status_t        _ReservedVectorIO5();
virtual status_t        _ReservedVectorIO6();
virtual status_t        _ReservedVectorIO7();
virtual status_t        _ReservedVectorIO8();
virtual status_t        _ReservedVectorIO9();
virtual status_t        _ReservedVectorIO10();

                        SVectorIO(const SVectorIO& o);
        SVectorIO&      operator=(const SVectorIO& o);

        enum {
            MAX_LOCAL_VECTOR    = 16,
            MAX_LOCAL_DATA      = 256
        };
        
        struct alloc_data {
            size_t  size;
            size_t  next_pos;
        };
        
        iovec                   m_localVector[MAX_LOCAL_VECTOR];
        SVector<iovec>*         m_heapVector;
        ssize_t                 m_vectorCount;
        size_t                  m_totalLength;
        
        alloc_data              m_localData;
        uint8_t                 m_localDataBuffer[MAX_LOCAL_DATA];
        SVector<alloc_data*>*   m_heapData;
};

#if _SUPPORTS_NAMESPACE
} } // namespace palmos::support
#endif

#endif

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PalmSource, Inc. © 2005