fontlist.c

   1 /*
   2  * fontlist.c
   3  * Copyright (C) 1998-2004 A.J. van Os; Released under GNU GPL
   4  *
   5  * Description:
   6  * Build, read and destroy a list of Word font information
   7  */
   8
   9 #include <stdlib.h>
  10 #include <stddef.h>
  11 #include "antiword.h"
  12
  13
  14 /*
  15  * Private structure to hide the way the information
  16  * is stored from the rest of the program
  17  */
  18 typedef struct font_desc_tag {
  19         font_block_type tInfo;
  20         struct font_desc_tag    *pNext;
  21 } font_mem_type;
  22
  23 /* Variables needed to write the Font Information List */
  24 static font_mem_type    *pAnchor = NULL;
  25 static font_mem_type    *pFontLast = NULL;
  26
  27
  28 /*
  29  * vDestroyFontInfoList - destroy the Font Information List
  30  */
  31 void
  32 vDestroyFontInfoList(void)
  33 {
  34         font_mem_type   *pCurr, *pNext;
  35
  36         DBG_MSG("vDestroyFontInfoList");
  37
  38         /* Free the Font Information List */
  39         pCurr = pAnchor;
  40         while (pCurr != NULL) {
  41                 pNext = pCurr->pNext;
  42                 pCurr = xfree(pCurr);
  43                 pCurr = pNext;
  44         }
  45         pAnchor = NULL;
  46         /* Reset all control variables */
  47         pFontLast = NULL;
  48 } /* end of vDestroyFontInfoList */
  49
  50 /*
  51  * vCorrectFontValues - correct font values to values Antiword can use
  52  */
  53 void
  54 vCorrectFontValues(font_block_type *pFontBlock)
  55 {
  56         UINT    uiRealSize;
  57         USHORT  usRealStyle;
  58
  59         uiRealSize = pFontBlock->usFontSize;
  60         usRealStyle = pFontBlock->usFontStyle;
  61         if (bIsSmallCapitals(pFontBlock->usFontStyle)) {
  62                 /* Small capitals become normal capitals in a smaller font */
  63                 uiRealSize = (uiRealSize * 4 + 2) / 5;
  64                 usRealStyle &= ~FONT_SMALL_CAPITALS;
  65                 usRealStyle |= FONT_CAPITALS;
  66         }
  67         if (bIsSuperscript(pFontBlock->usFontStyle) ||
  68             bIsSubscript(pFontBlock->usFontStyle)) {
  69                 /* Superscript and subscript use a smaller fontsize */
  70                 uiRealSize = (uiRealSize * 2 + 1) / 3;
  71         }
  72
  73         if (uiRealSize < MIN_FONT_SIZE) {
  74                 DBG_DEC(uiRealSize);
  75                 uiRealSize = MIN_FONT_SIZE;
  76         } else if (uiRealSize > MAX_FONT_SIZE) {
  77                 DBG_DEC(uiRealSize);
  78                 uiRealSize = MAX_FONT_SIZE;
  79         }
  80
  81         pFontBlock->usFontSize = (USHORT)uiRealSize;
  82         if (pFontBlock->ucFontColor == 8) {
  83                 /* White text to light gray text */
  84                 pFontBlock->ucFontColor = 16;
  85         }
  86         pFontBlock->usFontStyle = usRealStyle;
  87 } /* end of vCorrectFontValues */
  88
  89 /*
  90  * vAdd2FontInfoList - Add an element to the Font Information List
  91  */
  92 void
  93 vAdd2FontInfoList(const font_block_type *pFontBlock)
  94 {
  95         font_mem_type   *pListMember;
  96
  97         fail(pFontBlock == NULL);
  98
  99         NO_DBG_MSG("bAdd2FontInfoList");
 100
 101         if (pFontBlock->ulFileOffset == FC_INVALID) {
 102                 /*
 103                  * This offset is really past the end of the file,
 104                  * so don't waste any memory by storing it.
 105                  */
 106                 return;
 107         }
 108
 109         NO_DBG_HEX(pFontBlock->ulFileOffset);
 110         NO_DBG_DEC_C(pFontBlock->ucFontNumber != 0,
 111                                         pFontBlock->ucFontNumber);
 112         NO_DBG_DEC_C(pFontBlock->usFontSize != DEFAULT_FONT_SIZE,
 113                                         pFontBlock->usFontSize);
 114         NO_DBG_DEC_C(pFontBlock->ucFontColor != 0,
 115                                         pFontBlock->ucFontColor);
 116         NO_DBG_HEX_C(pFontBlock->usFontStyle != 0x00,
 117                                         pFontBlock->usFontStyle);
 118
 119         if (pFontLast != NULL &&
 120             pFontLast->tInfo.ulFileOffset == pFontBlock->ulFileOffset) {
 121                 /*
 122                  * If two consecutive fonts share the same
 123                  * offset, remember only the last font
 124                  */
 125                 fail(pFontLast->pNext != NULL);
 126                 pFontLast->tInfo = *pFontBlock;
 127                 return;
 128         }
 129
 130         /* Create list member */
 131         pListMember = xmalloc(sizeof(font_mem_type));
 132         /* Fill the list member */
 133         pListMember->tInfo = *pFontBlock;
 134         pListMember->pNext = NULL;
 135         /* Correct the values where needed */
 136         vCorrectFontValues(&pListMember->tInfo);
 137         /* Add the new member to the list */
 138         if (pAnchor == NULL) {
 139                 pAnchor = pListMember;
 140         } else {
 141                 fail(pFontLast == NULL);
 142                 pFontLast->pNext = pListMember;
 143         }
 144         pFontLast = pListMember;
 145 } /* end of vAdd2FontInfoList */
 146
 147 /*
 148  * Get the record that follows the given recored in the Font Information List
 149  */
 150 const font_block_type *
 151 pGetNextFontInfoListItem(const font_block_type *pCurr)
 152 {
 153         const font_mem_type     *pRecord;
 154         size_t  tOffset;
 155
 156         if (pCurr == NULL) {
 157                 if (pAnchor == NULL) {
 158                         /* There are no records */
 159                         return NULL;
 160                 }
 161                 /* The first record is the only one without a predecessor */
 162                 return &pAnchor->tInfo;
 163         }
 164         tOffset = offsetof(font_mem_type, tInfo);
 165         /* Many casts to prevent alignment warnings */
 166         pRecord = (font_mem_type *)(void *)((char *)pCurr - tOffset);
 167         fail(pCurr != &pRecord->tInfo);
 168         if (pRecord->pNext == NULL) {
 169                 /* The last record has no successor */
 170                 return NULL;
 171         }
 172         return &pRecord->pNext->tInfo;
 173 } /* end of pGetNextFontInfoListItem */