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/*
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* fontlist.c
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* Copyright (C) 1998-2004 A.J. van Os; Released under GNU GPL
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*
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* Description:
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* Build, read and destroy a list of Word font information
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*/
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#include <stdlib.h>
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#include <stddef.h>
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#include "antiword.h"
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/*
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* Private structure to hide the way the information
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* is stored from the rest of the program
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*/
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typedef struct font_desc_tag {
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font_block_type tInfo;
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struct font_desc_tag *pNext;
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} font_mem_type;
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/* Variables needed to write the Font Information List */
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static font_mem_type *pAnchor = NULL;
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static font_mem_type *pFontLast = NULL;
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/*
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* vDestroyFontInfoList - destroy the Font Information List
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*/
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void
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vDestroyFontInfoList(void)
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{
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font_mem_type *pCurr, *pNext;
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DBG_MSG("vDestroyFontInfoList");
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/* Free the Font Information List */
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pCurr = pAnchor;
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while (pCurr != NULL) {
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pNext = pCurr->pNext;
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pCurr = xfree(pCurr);
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pCurr = pNext;
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}
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pAnchor = NULL;
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/* Reset all control variables */
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pFontLast = NULL;
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} /* end of vDestroyFontInfoList */
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/*
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* vCorrectFontValues - correct font values to values Antiword can use
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*/
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void
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vCorrectFontValues(font_block_type *pFontBlock)
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{
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UINT uiRealSize;
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USHORT usRealStyle;
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uiRealSize = pFontBlock->usFontSize;
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usRealStyle = pFontBlock->usFontStyle;
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if (bIsSmallCapitals(pFontBlock->usFontStyle)) {
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/* Small capitals become normal capitals in a smaller font */
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uiRealSize = (uiRealSize * 4 + 2) / 5;
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usRealStyle &= ~FONT_SMALL_CAPITALS;
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usRealStyle |= FONT_CAPITALS;
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}
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if (bIsSuperscript(pFontBlock->usFontStyle) ||
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bIsSubscript(pFontBlock->usFontStyle)) {
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/* Superscript and subscript use a smaller fontsize */
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uiRealSize = (uiRealSize * 2 + 1) / 3;
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}
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if (uiRealSize < MIN_FONT_SIZE) {
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DBG_DEC(uiRealSize);
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uiRealSize = MIN_FONT_SIZE;
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} else if (uiRealSize > MAX_FONT_SIZE) {
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DBG_DEC(uiRealSize);
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uiRealSize = MAX_FONT_SIZE;
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}
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pFontBlock->usFontSize = (USHORT)uiRealSize;
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if (pFontBlock->ucFontColor == 8) {
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/* White text to light gray text */
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pFontBlock->ucFontColor = 16;
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}
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pFontBlock->usFontStyle = usRealStyle;
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} /* end of vCorrectFontValues */
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/*
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* vAdd2FontInfoList - Add an element to the Font Information List
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*/
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void
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vAdd2FontInfoList(const font_block_type *pFontBlock)
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{
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font_mem_type *pListMember;
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fail(pFontBlock == NULL);
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NO_DBG_MSG("bAdd2FontInfoList");
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if (pFontBlock->ulFileOffset == FC_INVALID) {
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/*
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* This offset is really past the end of the file,
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* so don't waste any memory by storing it.
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*/
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return;
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}
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NO_DBG_HEX(pFontBlock->ulFileOffset);
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NO_DBG_DEC_C(pFontBlock->ucFontNumber != 0,
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pFontBlock->ucFontNumber);
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NO_DBG_DEC_C(pFontBlock->usFontSize != DEFAULT_FONT_SIZE,
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pFontBlock->usFontSize);
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NO_DBG_DEC_C(pFontBlock->ucFontColor != 0,
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pFontBlock->ucFontColor);
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NO_DBG_HEX_C(pFontBlock->usFontStyle != 0x00,
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pFontBlock->usFontStyle);
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if (pFontLast != NULL &&
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pFontLast->tInfo.ulFileOffset == pFontBlock->ulFileOffset) {
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/*
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* If two consecutive fonts share the same
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* offset, remember only the last font
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*/
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fail(pFontLast->pNext != NULL);
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pFontLast->tInfo = *pFontBlock;
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return;
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}
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/* Create list member */
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pListMember = xmalloc(sizeof(font_mem_type));
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/* Fill the list member */
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pListMember->tInfo = *pFontBlock;
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pListMember->pNext = NULL;
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/* Correct the values where needed */
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vCorrectFontValues(&pListMember->tInfo);
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/* Add the new member to the list */
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if (pAnchor == NULL) {
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pAnchor = pListMember;
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} else {
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fail(pFontLast == NULL);
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pFontLast->pNext = pListMember;
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}
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pFontLast = pListMember;
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} /* end of vAdd2FontInfoList */
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/*
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* Get the record that follows the given recored in the Font Information List
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*/
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const font_block_type *
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pGetNextFontInfoListItem(const font_block_type *pCurr)
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{
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const font_mem_type *pRecord;
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size_t tOffset;
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if (pCurr == NULL) {
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if (pAnchor == NULL) {
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/* There are no records */
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return NULL;
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}
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/* The first record is the only one without a predecessor */
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return &pAnchor->tInfo;
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}
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tOffset = offsetof(font_mem_type, tInfo);
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/* Many casts to prevent alignment warnings */
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pRecord = (font_mem_type *)(void *)((char *)pCurr - tOffset);
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fail(pCurr != &pRecord->tInfo);
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if (pRecord->pNext == NULL) {
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/* The last record has no successor */
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return NULL;
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}
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return &pRecord->pNext->tInfo;
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} /* end of pGetNextFontInfoListItem */
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