sys/src/cmd/aux/antiword/pictlist.c

   1 /*
   2  * pictlist.c
   3  * Copyright (C) 2000-2004 A.J. van Os; Released under GNU GPL
   4  *
   5  * Description:
   6  * Build, read and destroy a list of Word picture information
   7  */
   8
   9 #include <stdlib.h>
  10 #include "antiword.h"
  11
  12
  13 /*
  14  * Private structure to hide the way the information
  15  * is stored from the rest of the program
  16  */
  17 typedef struct picture_mem_tag {
  18         picture_block_type      tInfo;
  19         struct picture_mem_tag *pNext;
  20 } picture_mem_type;
  21
  22 /* Variables needed to write the Picture Information List */
  23 static picture_mem_type *pAnchor = NULL;
  24 static picture_mem_type *pPictureLast = NULL;
  25
  26
  27 /*
  28  * vDestroyPictInfoList - destroy the Picture Information List
  29  */
  30 void
  31 vDestroyPictInfoList(void)
  32 {
  33         picture_mem_type        *pCurr, *pNext;
  34
  35         DBG_MSG("vDestroyPictInfoList");
  36
  37         /* Free the Picture Information List */
  38         pCurr = pAnchor;
  39         while (pCurr != NULL) {
  40                 pNext = pCurr->pNext;
  41                 pCurr = xfree(pCurr);
  42                 pCurr = pNext;
  43         }
  44         pAnchor = NULL;
  45         /* Reset all control variables */
  46         pPictureLast = NULL;
  47 } /* end of vDestroyPictInfoList */
  48
  49 /*
  50  * vAdd2PictInfoList - Add an element to the Picture Information List
  51  */
  52 void
  53 vAdd2PictInfoList(const picture_block_type *pPictureBlock)
  54 {
  55         picture_mem_type        *pListMember;
  56
  57         fail(pPictureBlock == NULL);
  58
  59         NO_DBG_MSG("bAdd2PictInfoList");
  60
  61         if (pPictureBlock->ulFileOffset == FC_INVALID) {
  62                 /*
  63                  * This offset is really past the end of the file,
  64                  * so don't waste any memory by storing it.
  65                  */
  66                 return;
  67         }
  68         if (pPictureBlock->ulFileOffsetPicture == FC_INVALID) {
  69                 /*
  70                  * The place where this picture is supposed to be stored
  71                  * doesn't exist.
  72                  */
  73                 return;
  74         }
  75
  76         NO_DBG_HEX(pPictureBlock->ulFileOffset);
  77         NO_DBG_HEX(pPictureBlock->ulFileOffsetPicture);
  78         NO_DBG_HEX(pPictureBlock->ulPictureOffset);
  79
  80         /* Create list member */
  81         pListMember = xmalloc(sizeof(picture_mem_type));
  82         /* Fill the list member */
  83         pListMember->tInfo = *pPictureBlock;
  84         pListMember->pNext = NULL;
  85         /* Add the new member to the list */
  86         if (pAnchor == NULL) {
  87                 pAnchor = pListMember;
  88         } else {
  89                 fail(pPictureLast == NULL);
  90                 pPictureLast->pNext = pListMember;
  91         }
  92         pPictureLast = pListMember;
  93 } /* end of vAdd2PictInfoList */
  94
  95 /*
  96  * Get the info with the given file offset from the Picture Information List
  97  */
  98 ULONG
  99 ulGetPictInfoListItem(ULONG ulFileOffset)
 100 {
 101         picture_mem_type        *pCurr;
 102
 103         for (pCurr = pAnchor; pCurr != NULL; pCurr = pCurr->pNext) {
 104                 if (pCurr->tInfo.ulFileOffset == ulFileOffset) {
 105                         return pCurr->tInfo.ulFileOffsetPicture;
 106                 }
 107         }
 108         return FC_INVALID;
 109 } /* end of ulGetPictInfoListItem */