fonts.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

			vFontname2Table(aucFont, NULL, 1, iEmphasis,
					ucFFN, szWordFont, szOurFont, pTmp);
		}
	}
	(void)fclose(pFontTableFile);
	vMinimizeFontTable();
} /* end of vCreate0FontTable */

/*
 * vCreate2FontTable - create a font table from WinWord 1/2
 */
void
vCreate2FontTable(FILE *pFile, int iWordVersion, const UCHAR *aucHeader)
{
	FILE	*pFontTableFile;
	font_table_type	*pTmp;
	UCHAR	*aucFont;
	UCHAR	*aucBuffer;
	ULONG	ulBeginFontInfo;
	size_t	tFontInfoLen;
	int	iPos, iOff, iRecLen;
	int	iBold, iItalic, iSpecial, iEmphasis;
	UCHAR	ucFFN;
	char	szWordFont[FONT_LINE_LENGTH], szOurFont[FONT_LINE_LENGTH];

	fail(pFile == NULL || aucHeader == NULL);
	fail(iWordVersion != 1 && iWordVersion != 2);

	tFontTableRecords = 0;
	pFontTable = xfree(pFontTable);

	pFontTableFile = pOpenFontTableFile();
	if (pFontTableFile == NULL) {
		/* No translation table file, no translation table */
		return;
	}

	ulBeginFontInfo = ulGetLong(0xb2, aucHeader); /* fcSttbfffn */
	DBG_HEX(ulBeginFontInfo);
	tFontInfoLen = (size_t)usGetWord(0xb6, aucHeader); /* cbSttbfffn */
	DBG_DEC(tFontInfoLen);

	if (ulBeginFontInfo > (ULONG)LONG_MAX || tFontInfoLen == 0) {
		/* Don't ask me why this is needed */
		DBG_HEX_C(tFontInfoLen != 0, ulBeginFontInfo);
		(void)fclose(pFontTableFile);
		return;
	}

	aucBuffer = xmalloc(tFontInfoLen);
	if (!bReadBytes(aucBuffer, tFontInfoLen, ulBeginFontInfo, pFile)) {
		aucBuffer = xfree(aucBuffer);
		(void)fclose(pFontTableFile);
		return;
	}
	NO_DBG_PRINT_BLOCK(aucBuffer, tFontInfoLen);
	DBG_DEC(usGetWord(0, aucBuffer));

	/* Compute the maximum number of entries in the font table */
	if (iWordVersion == 1) {
		fail(tFontInfoLen < 2);
		/* WinWord 1 has three implicit fonts */
		tFontTableRecords = 3;
		iOff = 2;
	} else {
		fail(tFontInfoLen < 6);
		/* WinWord 2 and up have no implicit fonts */
		tFontTableRecords = 0;
		iOff = 3;
	}
	iPos = 2;
	while (iPos + iOff < (int)tFontInfoLen) {
		iRecLen = (int)ucGetByte(iPos, aucBuffer);
		NO_DBG_DEC(iRecLen);
		NO_DBG_MSG(aucBuffer + iPos + iOff);
		iPos += iRecLen + 1;
		tFontTableRecords++;
	}
	tFontTableRecords *= 4;	/* Plain, Bold, Italic and Bold/Italic */
	tFontTableRecords++;	/* One extra for the table-font */
	vCreateFontTable();

	/* Add the tree implicit fonts (in four variations) */
	if (iWordVersion == 1) {
		fail(tFontTableRecords < 13);
		vFontname2Table((UCHAR *)"Tms Rmn", NULL, 1, 0,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-Roman", pFontTable + 0);
		vFontname2Table((UCHAR *)"Tms Rmn", NULL, 1, 1,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-Bold", pFontTable + 1);
		vFontname2Table((UCHAR *)"Tms Rmn", NULL, 1, 2,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-Italic", pFontTable + 2);
		vFontname2Table((UCHAR *)"Tms Rmn", NULL, 1, 3,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-BoldItalic", pFontTable + 3);
		vFontname2Table((UCHAR *)"Symbol", NULL, 1, 0,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-Roman", pFontTable + 4);
		vFontname2Table((UCHAR *)"Symbol", NULL, 1, 1,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-Bold", pFontTable + 5);
		vFontname2Table((UCHAR *)"Symbol", NULL, 1, 2,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-Italic", pFontTable + 6);
		vFontname2Table((UCHAR *)"Symbol", NULL, 1, 3,
			(UCHAR)((FAMILY_ROMAN << 4) | PITCH_VARIABLE),
			"*", "Times-BoldItalic", pFontTable + 7);
		vFontname2Table((UCHAR *)"Helv", NULL, 1, 0,
			(UCHAR)((FAMILY_SWISS << 4) | PITCH_VARIABLE),
			"*", "Helvetica", pFontTable + 8);
		vFontname2Table((UCHAR *)"Helv", NULL, 1, 1,
			(UCHAR)((FAMILY_SWISS << 4) | PITCH_VARIABLE),
			"*", "Helvetica-Bold", pFontTable + 9);
		vFontname2Table((UCHAR *)"Helv", NULL, 1, 2,
			(UCHAR)((FAMILY_SWISS << 4) | PITCH_VARIABLE),
			"*", "Helvetica-Oblique", pFontTable + 10);
		vFontname2Table((UCHAR *)"Helv", NULL, 1, 3,
			(UCHAR)((FAMILY_SWISS << 4) | PITCH_VARIABLE),
			"*", "Helvetica-BoldOblique", pFontTable + 11);
	}

	/* Read the font translation file */
	iItalic = 0;
	iBold = 0;
	iSpecial = 0;
	while (bReadFontFile(pFontTableFile, szWordFont,
			&iItalic, &iBold, szOurFont, &iSpecial)) {
		iEmphasis = 0;
		if (iBold != 0) {
			iEmphasis++;
		}
		if (iItalic != 0) {
			iEmphasis += 2;
		}
		pTmp = pFontTable + iEmphasis;
		iPos = 2;
		while (iPos + iOff < (int)tFontInfoLen) {
			iRecLen = (int)ucGetByte(iPos, aucBuffer);
			ucFFN = ucGetByte(iPos + 1, aucBuffer);
			aucFont = aucBuffer + iPos + iOff;
			vFontname2Table(aucFont, NULL, 1, iEmphasis,
					ucFFN, szWordFont, szOurFont, pTmp);
			pTmp += 4;
			iPos += iRecLen + 1;
		}
	}
	(void)fclose(pFontTableFile);
	aucBuffer = xfree(aucBuffer);
	vMinimizeFontTable();
} /* end of vCreate2FontTable */

/*
 * vCreate6FontTable - create a font table from Word 6/7
 */
void
vCreate6FontTable(FILE *pFile, ULONG ulStartBlock,
	const ULONG *aulBBD, size_t tBBDLen,
	const UCHAR *aucHeader)
{
	FILE	*pFontTableFile;
	font_table_type	*pTmp;
	UCHAR	*aucFont, *aucAltFont;
	UCHAR	*aucBuffer;
	ULONG	ulBeginFontInfo;
	size_t	tFontInfoLen;
	int	iPos, iRecLen, iOffsetAltName;
	int	iBold, iItalic, iSpecial, iEmphasis;
	UCHAR	ucFFN;
	char	szWordFont[FONT_LINE_LENGTH], szOurFont[FONT_LINE_LENGTH];

	fail(pFile == NULL || aucHeader == NULL);
	fail(ulStartBlock > MAX_BLOCKNUMBER && ulStartBlock != END_OF_CHAIN);
	fail(aulBBD == NULL);

	tFontTableRecords = 0;
	pFontTable = xfree(pFontTable);

	pFontTableFile = pOpenFontTableFile();
	if (pFontTableFile == NULL) {
		/* No translation table file, no translation table */
		return;
	}

	ulBeginFontInfo = ulGetLong(0xd0, aucHeader); /* fcSttbfffn */
	DBG_HEX(ulBeginFontInfo);
	tFontInfoLen = (size_t)ulGetLong(0xd4, aucHeader); /* lcbSttbfffn */
	DBG_DEC(tFontInfoLen);
	fail(tFontInfoLen < 9);

	aucBuffer = xmalloc(tFontInfoLen);
	if (!bReadBuffer(pFile, ulStartBlock,
			aulBBD, tBBDLen, BIG_BLOCK_SIZE,
			aucBuffer, ulBeginFontInfo, tFontInfoLen)) {
		aucBuffer = xfree(aucBuffer);
		(void)fclose(pFontTableFile);
		return;
	}
	DBG_DEC(usGetWord(0, aucBuffer));

	/* Compute the maximum number of entries in the font table */
	tFontTableRecords = 0;
	iPos = 2;
	while (iPos + 6 < (int)tFontInfoLen) {
		iRecLen = (int)ucGetByte(iPos, aucBuffer);
		NO_DBG_DEC(iRecLen);
		iOffsetAltName = (int)ucGetByte(iPos + 5, aucBuffer);
		NO_DBG_MSG(aucBuffer + iPos + 6);
		NO_DBG_MSG_C(iOffsetAltName > 0,
				aucBuffer + iPos + 6 + iOffsetAltName);
		iPos += iRecLen + 1;
		tFontTableRecords++;
	}
	tFontTableRecords *= 4;	/* Plain, Bold, Italic and Bold/italic */
	tFontTableRecords++;	/* One extra for the table-font */
	vCreateFontTable();

	/* Read the font translation file */
	iItalic = 0;
	iBold = 0;
	iSpecial = 0;
	while (bReadFontFile(pFontTableFile, szWordFont,
			&iItalic, &iBold, szOurFont, &iSpecial)) {
		iEmphasis = 0;
		if (iBold != 0) {
			iEmphasis++;
		}
		if (iItalic != 0) {
			iEmphasis += 2;
		}
		pTmp = pFontTable + iEmphasis;
		iPos = 2;
		while (iPos + 6 < (int)tFontInfoLen) {
			iRecLen = (int)ucGetByte(iPos, aucBuffer);
			ucFFN = ucGetByte(iPos + 1, aucBuffer);
			aucFont = aucBuffer + iPos + 6;
			iOffsetAltName = (int)ucGetByte(iPos + 5, aucBuffer);
			if (iOffsetAltName <= 0) {
				aucAltFont = NULL;
			} else {
				aucAltFont = aucFont + iOffsetAltName;
				NO_DBG_MSG(aucFont);
				NO_DBG_MSG(aucAltFont);
			}
			vFontname2Table(aucFont, aucAltFont, 1, iEmphasis,
					ucFFN, szWordFont, szOurFont, pTmp);
			pTmp += 4;
			iPos += iRecLen + 1;
		}
	}
	(void)fclose(pFontTableFile);
	aucBuffer = xfree(aucBuffer);
	vMinimizeFontTable();
} /* end of vCreate6FontTable */

/*
 * vCreate8FontTable - create a font table from Word 8/9/10
 */
void
vCreate8FontTable(FILE *pFile, const pps_info_type *pPPS,
	const ULONG *aulBBD, size_t tBBDLen,
	const ULONG *aulSBD, size_t tSBDLen,
	const UCHAR *aucHeader)
{
	FILE	*pFontTableFile;
	font_table_type	*pTmp;
	const ULONG	*aulBlockDepot;
	UCHAR	*aucFont, *aucAltFont;
	UCHAR	*aucBuffer;
	ULONG	ulBeginFontInfo;
	size_t	tFontInfoLen, tBlockDepotLen, tBlockSize;
	int	iPos, iRecLen, iOffsetAltName;
	int	iBold, iItalic, iSpecial, iEmphasis;
	UCHAR	ucFFN;
	char	szWordFont[FONT_LINE_LENGTH], szOurFont[FONT_LINE_LENGTH];

	fail(pFile == NULL || pPPS == NULL || aucHeader == NULL);
	fail(aulBBD == NULL || aulSBD == NULL);

	tFontTableRecords = 0;
	pFontTable = xfree(pFontTable);

	pFontTableFile = pOpenFontTableFile();
	if (pFontTableFile == NULL) {
		/* No translation table file, no translation table */
		return;
	}

	ulBeginFontInfo = ulGetLong(0x112, aucHeader); /* fcSttbfffn */
	DBG_HEX(ulBeginFontInfo);
	tFontInfoLen = (size_t)ulGetLong(0x116, aucHeader); /* lcbSttbfffn */
	DBG_DEC(tFontInfoLen);
	fail(tFontInfoLen < 46);

	DBG_DEC(pPPS->tTable.ulSB);
	DBG_HEX(pPPS->tTable.ulSize);
	if (pPPS->tTable.ulSize == 0) {
		DBG_MSG("No fontname table");
		(void)fclose(pFontTableFile);
		return;
	}

	if (pPPS->tTable.ulSize < MIN_SIZE_FOR_BBD_USE) {
		/* Use the Small Block Depot */
		aulBlockDepot = aulSBD;
		tBlockDepotLen = tSBDLen;
		tBlockSize = SMALL_BLOCK_SIZE;
	} else {
		/* Use the Big Block Depot */
		aulBlockDepot = aulBBD;
		tBlockDepotLen = tBBDLen;
		tBlockSize = BIG_BLOCK_SIZE;
	}
	aucBuffer = xmalloc(tFontInfoLen);
	if (!bReadBuffer(pFile, pPPS->tTable.ulSB,
			aulBlockDepot, tBlockDepotLen, tBlockSize,
			aucBuffer, ulBeginFontInfo, tFontInfoLen)) {
		aucBuffer = xfree(aucBuffer);
		(void)fclose(pFontTableFile);
		return;
	}
	NO_DBG_PRINT_BLOCK(aucBuffer, tFontInfoLen);

	/* Get the maximum number of entries in the font table */
	tFontTableRecords = (size_t)usGetWord(0, aucBuffer);
	tFontTableRecords *= 4;	/* Plain, Bold, Italic and Bold/italic */
	tFontTableRecords++;	/* One extra for the table-font */
	vCreateFontTable();

	/* Read the font translation file */
	iItalic = 0;
	iBold = 0;
	iSpecial = 0;
	while (bReadFontFile(pFontTableFile, szWordFont,
			&iItalic, &iBold, szOurFont, &iSpecial)) {
		iEmphasis = 0;
		if (iBold != 0) {
			iEmphasis++;
		}
		if (iItalic != 0) {
			iEmphasis += 2;
		}
		pTmp = pFontTable + iEmphasis;
		iPos = 4;
		while (iPos + 40 < (int)tFontInfoLen) {
			iRecLen = (int)ucGetByte(iPos, aucBuffer);
			ucFFN = ucGetByte(iPos + 1, aucBuffer);
			aucFont = aucBuffer + iPos + 40;
			iOffsetAltName = (int)unilen(aucFont);
			if (iPos + 40 + iOffsetAltName + 4 >= iRecLen) {
				aucAltFont = NULL;
			} else {
				aucAltFont = aucFont + iOffsetAltName + 2;
				NO_DBG_UNICODE(aucFont);
				NO_DBG_UNICODE(aucAltFont);
			}
			vFontname2Table(aucFont, aucAltFont, 2, iEmphasis,
					ucFFN, szWordFont, szOurFont, pTmp);
			pTmp += 4;
			iPos += iRecLen + 1;
		}
	}
	(void)fclose(pFontTableFile);
	aucBuffer = xfree(aucBuffer);
	vMinimizeFontTable();
} /* end of vCreate8FontTable */

/*
 * Destroy the internal font table by freeing its memory
 */
void
vDestroyFontTable(void)
{
	DBG_MSG("vDestroyFontTable");

	tFontTableRecords = 0;
	pFontTable = xfree(pFontTable);
} /* end of vDestroyFontTable */

/*
 * pGetNextFontTableRecord
 *
 * returns the next record in the table or NULL if there is no next record
 */
const font_table_type *
pGetNextFontTableRecord(const font_table_type *pRecordCurr)
{
	size_t	tIndexCurr;

	if (pRecordCurr == NULL) {
		/* No current record, so start with the first one */
		return &pFontTable[0];
	}

	if (pRecordCurr < pFontTable ||
	    pRecordCurr >= pFontTable + tFontTableRecords) {
		/* Not a pointer in the array */
		DBG_HEX(pRecordCurr);
		DBG_HEX(pFontTable);
		return NULL;
	}

	tIndexCurr = (size_t)(pRecordCurr - pFontTable);
	if (tIndexCurr + 1 < tFontTableRecords) {
		/* There is a next record, so return it */
		return &pFontTable[tIndexCurr + 1];
	}
	/* There is no next record */
	return NULL;
} /* end of pGetNextFontTableRecord */

/*
 * tGetFontTableLength
 *
 * returns the number of records in the internal font table
 */
size_t
tGetFontTableLength(void)
{
	return tFontTableRecords;
} /* end of tGetFontTableLength */

#if !defined(__riscos)
/*
 * vCorrect4PDF - only include PDF default fonts
 */
static void
vCorrect4PDF(void)
{
	font_table_type	*pTmp;
	const char	*szOurFont;

	for (pTmp = pFontTable; pTmp < pFontTable + tFontTableRecords; pTmp++) {
		if (STRCEQ(pTmp->szOurFontname, FONT_MONOSPACED_PLAIN) ||
		    STRCEQ(pTmp->szOurFontname, FONT_MONOSPACED_BOLD) ||
		    STRCEQ(pTmp->szOurFontname, FONT_MONOSPACED_ITALIC) ||
		    STRCEQ(pTmp->szOurFontname, FONT_MONOSPACED_BOLDITALIC) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SERIF_PLAIN) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SERIF_BOLD) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SERIF_ITALIC) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SERIF_BOLDITALIC) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SANS_SERIF_PLAIN) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SANS_SERIF_BOLD) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SANS_SERIF_ITALIC) ||
		    STRCEQ(pTmp->szOurFontname, FONT_SANS_SERIF_BOLDITALIC)) {
			/* Already a default font */
			continue;
		}
		szOurFont =
			szGetDefaultFont(pTmp->ucFFN, (int)pTmp->ucEmphasis);
		(void)strncpy(pTmp->szOurFontname, szOurFont,
			sizeof(pTmp->szOurFontname) - 1);
		pTmp->szOurFontname[sizeof(pTmp->szOurFontname) - 1] = '\0';
	}
} /* end of vCorrect4PDF */

/*
 * vCorrect4CyrPS - only include monospaced fonts
 */
static void
vCorrect4CyrPS(void)
{
	font_table_type	*pTmp;
	const char	*szOurFont;
	UCHAR	ucFFN;

	ucFFN = (FAMILY_UNKNOWN << 4) | PITCH_FIXED;
	for (pTmp = pFontTable; pTmp < pFontTable + tFontTableRecords; pTmp++) {
		szOurFont = szGetDefaultFont(ucFFN, (int)pTmp->ucEmphasis);
		(void)strncpy(pTmp->szOurFontname, szOurFont,
			sizeof(pTmp->szOurFontname) - 1);
		pTmp->szOurFontname[sizeof(pTmp->szOurFontname) - 1] = '\0';
	}
} /* end of vCorrect4CyrPS */
#endif /* __riscos */

/*
 * vCorrectFontTable - correct the font table in special cases
 */
void
vCorrectFontTable(conversion_type eConversionType, encoding_type eEncoding)
{
#if !defined(__riscos)
	if (eConversionType == conversion_pdf) {
		vCorrect4PDF();
	}
	if (eConversionType == conversion_ps &&
	    eEncoding == encoding_cyrillic) {
		vCorrect4CyrPS();
	}
#endif /* __riscos */
} /* end of vCorrectFontTable */

/*
 * lComputeSpaceWidth - compute the width of a space character
 *
 * Returns the space width in millipoints
 */
long
lComputeSpaceWidth(drawfile_fontref tFontRef, USHORT usFontSize)
{
	char	szSpace[] = " ";

	fail(usFontSize < MIN_FONT_SIZE || usFontSize > MAX_FONT_SIZE);

        return lComputeStringWidth(szSpace, 1, tFontRef, usFontSize);
} /* end of lComputeSpaceWidth */