examples/PIPS/antiword/src/pictlist.c

/*
 * pictlist.c
 * Copyright (C) 2000-2004 A.J. van Os; Released under GNU GPL
 *
 * Description:
 * Build, read and destroy a list of Word picture information
 */

#include <stdlib.h>
#include "antiword.h"


/*
 * Private structure to hide the way the information
 * is stored from the rest of the program
 */
typedef struct picture_mem_tag {
        picture_block_type      tInfo;
        struct picture_mem_tag *pNext;
} picture_mem_type;

/* Variables needed to write the Picture Information List */
static picture_mem_type *pAnchor = NULL;
static picture_mem_type *pPictureLast = NULL;


/*
 * vDestroyPictInfoList - destroy the Picture Information List
 */
void
vDestroyPictInfoList(void)
{
        picture_mem_type        *pCurr, *pNext;

        DBG_MSG("vDestroyPictInfoList");

        /* Free the Picture Information List */
        pCurr = pAnchor;
        while (pCurr != NULL) {
                pNext = pCurr->pNext;
                pCurr = xfree(pCurr);
                pCurr = pNext;
        }
        pAnchor = NULL;
        /* Reset all control variables */
        pPictureLast = NULL;
} /* end of vDestroyPictInfoList */

/*
 * vAdd2PictInfoList - Add an element to the Picture Information List
 */
void
vAdd2PictInfoList(const picture_block_type *pPictureBlock)
{
        picture_mem_type        *pListMember;

        fail(pPictureBlock == NULL);

        NO_DBG_MSG("bAdd2PictInfoList");

        if (pPictureBlock->ulFileOffset == FC_INVALID) {
                /*
                 * This offset is really past the end of the file,
                 * so don't waste any memory by storing it.
                 */
                return;
        }
        if (pPictureBlock->ulFileOffsetPicture == FC_INVALID) {
                /*
                 * The place where this picture is supposed to be stored
                 * doesn't exist.
                 */
                return;
        }

        NO_DBG_HEX(pPictureBlock->ulFileOffset);
        NO_DBG_HEX(pPictureBlock->ulFileOffsetPicture);
        NO_DBG_HEX(pPictureBlock->ulPictureOffset);

        /* Create list member */
        pListMember = xmalloc(sizeof(picture_mem_type));
        /* Fill the list member */
        pListMember->tInfo = *pPictureBlock;
        pListMember->pNext = NULL;
        /* Add the new member to the list */
        if (pAnchor == NULL) {
                pAnchor = pListMember;
        } else {
                fail(pPictureLast == NULL);
                pPictureLast->pNext = pListMember;
        }
        pPictureLast = pListMember;
} /* end of vAdd2PictInfoList */

/*
 * Get the info with the given file offset from the Picture Information List
 */
ULONG
ulGetPictInfoListItem(ULONG ulFileOffset)
{
        picture_mem_type        *pCurr;

        for (pCurr = pAnchor; pCurr != NULL; pCurr = pCurr->pNext) {
                if (pCurr->tInfo.ulFileOffset == ulFileOffset) {
                        return pCurr->tInfo.ulFileOffsetPicture;
                }
        }
        return FC_INVALID;
} /* end of ulGetPictInfoListItem */

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