Beesnest/DcBuffersList.cpp

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/*
Copyright 2007 Erez Bibi (erezbibi@users.sourceforge.net)
This file is part of Beesnest.

Beesnest 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.

Beesnest 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 Beesnest; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

/**
 * CdcBuffersLiat.cpp: implementation of the CdcBuffersList class.
 * for documentation see the header file.
 */

#include "DcBuffersList.h"

void CdcBuffersList::Clear ()
{
    oIter = oBuffList.end ();
    oBuffList.clear ();
}

void CdcBuffersList::Add (const CdcBuffer& buff, const CdcFileAttrib& attr,
    int offset, int length)
{
    /* Check offset + length is less then total buffer length. */
    if (offset + length <= buff.GetDataSize ())
        oBuffList.insert (oIter, CdcBuffersList::Buff (buff, attr, offset,
            length));
}

void CdcBuffersList::Insert (const CdcBuffer& buff, int start, int length)
{
    if (oIter == oBuffList.end ()) return;          /* Empty list */
    if (start > (*oIter).nLength) return;           /* Invalid start point. */
    if (length > (*oIter).nLength - start) return;  /* Invalid length. */

    /* Keep copy of current buffer for letter use. */
    CdcBuffersList::Buff temp_buff = *oIter;
    if (start > 0 &&
        temp_buff.oBuff.IsWhiteSpaces (temp_buff.nOffset, start) == false)
    {   /* We need to keep first part of the current buffer. */
        (*oIter).nLength = start - 1;   /* Trim current buffer. */
        oIter++;                        /* Go to next buffer (may be .end()). */
    }
    /* Insert entire new buffer before current one. */
    oBuffList.insert (oIter, CdcBuffersList::Buff (buff));

    if (length > -1)    /* Need to push forward scond part of old buffer. */
    {
        int shift = start + length;
        temp_buff.nOffset += shift; /* Here is the new offset piont. */
        temp_buff.nLength -= shift; /* And the new length compensate for it. */
        if (temp_buff.oBuff.IsWhiteSpaces (temp_buff.nOffset, temp_buff.nLength)
            == false)
        {
            oBuffList.insert (oIter, temp_buff);
            oIter--;                /* Go back to point to this second new buffer. */
        }
    }
    oIter--;    /* And in the end point to the inserted buffer. */
}

bool CdcBuffersList::SeekFirst ()
{
    if (oBuffList.empty ())
        return false;
    oIter = oBuffList.begin ();
    return true;
}

bool CdcBuffersList::SeekNext ()
{
    oIter++;
    return !(oIter == oBuffList.end ());
}

t_buff_unit* CdcBuffersList::GetPointer ()
{
    if (oIter == oBuffList.end ())  /* Empty list */
        return NULL;
    return ((*oIter).oBuff.GetPointer () + (*oIter).nOffset);
}

int CdcBuffersList::GetLength ()
{
    if (oIter == oBuffList.end ())  /* Empty list */
        return 0;
    if ((*oIter).nLength == -1)     /* current buff is entire buffer */
        return ((*oIter).oBuff.GetDataSize () - (*oIter).nOffset);
    return (*oIter).nLength;
}

const CdcBuffer* CdcBuffersList::GetBufferPointer ()
{
    if (oIter == oBuffList.end ())  /* Empty list */
        return NULL;
    return &((*oIter).oBuff);
}

int CdcBuffersList::GetBufferOffset ()
{
    if (oIter == oBuffList.end ())  /* Empty list */
        return 0;
    return (*oIter).nOffset;
}

int CdcBuffersList::GetDataSize ()
{
    int size = 0;
    if (SeekFirst () == false)
        return size;

    do
        size += GetLength ();
    while (SeekNext ());
    return size;
}

CdcFileAttrib CdcBuffersList::GetFileAttrib ()
{
    if (oIter == oBuffList.end ())  /* Empty list */
        return CdcFileAttrib ();    /* Return an empty file-attrib object. */
    return (*oIter).oFileAttrib;
}