dvisvgm 1.0.10

git-svn-id: svn://tug.org/texlive/trunk@24907 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 190 insertions, 0 deletions

diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/VFReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/VFReader.cpp
new file mode 100644
index 00000000000..57660c99825
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.10/src/VFReader.cpp
@@ -0,0 +1,190 @@
+/*************************************************************************
+** VFReader.cpp                                                         **
+**                                                                      **
+** This file is part of dvisvgm -- the DVI to SVG converter             **
+** Copyright (C) 2005-2011 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#include <sstream>
+#include "Font.h"
+#include "VFActions.h"
+#include "VFReader.h"
+#include "macros.h"
+
+using namespace std;
+
+
+/** Converts a TFM fix point value to double. */
+inline static double fix2double (FixWord fix) {
+	return double(fix)/(1 << 20);
+}
+
+
+VFReader::VFReader (istream &is)
+	: StreamReader(is), actions(0) {
+}
+
+
+VFReader::~VFReader () {
+}
+
+
+VFActions* VFReader::replaceActions (VFActions *a) {
+	VFActions *ret = actions;
+	actions = a;
+	return ret;
+}
+
+
+/** Reads a single VF command from the current position of the input stream and calls the
+ *  corresponding cmdFOO method. The execution can be influenced by a function of type ApproveOpcode.
+ *  It takes an opcode and returns true if the command is supposed to be executed.
+ *  @param[in] approve function to approve invocation of the action assigned to command
+ *  @return opcode of the executed command */
+int VFReader::executeCommand (ApproveAction approve) {
+	int opcode = in().get();
+	if (!in() || opcode < 0)  // at end of file
+		throw VFException("invalid file");
+
+	bool approved = !approve || approve(opcode);
+	VFActions *act = actions;
+	if (!approved)
+		replaceActions(0);   // disable actions
+
+	if (opcode <= 241)      // short character definition?
+		cmdShortChar(opcode);
+	else if (opcode >= 243 && opcode <= 246)   // font definition?
+		cmdFontDef(opcode-243+1);
+	else {
+		switch (opcode) {
+			case 242: cmdLongChar(); break;      // long character definition
+			case 247: cmdPre();      break;      // preamble
+			case 248: cmdPost();     break;      // postamble
+			default : {                          // invalid opcode
+				replaceActions(act);              // reenable actions
+				ostringstream oss;
+				oss << "undefined VF command (opcode " << opcode << ')';
+				throw VFException(oss.str());
+			}
+		}
+	}
+	replaceActions(act); // reenable actions
+	return opcode;
+}
+
+
+bool VFReader::executeAll () {
+  	in().clear();   // reset all status bits
+	if (!in())
+		return false;
+	in().seekg(0);  // move file pointer to first byte of the input stream
+	while (!in().eof() && executeCommand() != 248); // stop reading after post (248)
+	return true;
+}
+
+
+/// Returns true if op indicates the preamble or a font definition
+static bool is_pre_or_fontdef (int op) {return op > 242;}
+static bool is_chardef (int op)        {return op < 243;}
+
+
+bool VFReader::executePreambleAndFontDefs () {
+	in().clear();
+	if (!in())
+		return false;
+	in().seekg(0);  // move file pointer to first byte of the input stream
+	while (!in().eof() && executeCommand(is_pre_or_fontdef) > 242); // stop reading after last font definition
+	return true;
+}
+
+
+bool VFReader::executeCharDefs () {
+	in().clear();
+	if (!in())
+		return false;
+	in().seekg(0);
+	while (!in().eof() && executeCommand(is_chardef) < 243); // stop reading after last char definition
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+/** Reads and executes DVI preamble command. */
+void VFReader::cmdPre () {
+	UInt32 i   = readUnsigned(1);  // identification number (should be 2)
+	UInt32 k   = readUnsigned(1);  // length of following comment
+	string cmt = readString(k);    // comment
+	UInt32 cs  = readUnsigned(4);  // check sum to be compared with TFM cecksum
+	UInt32 ds  = readUnsigned(4);  // design size (same as TFM design size) (fix_word)
+	designSize = fix2double(ds);
+	if (i != 202)
+		throw VFException("invalid identification value in preamble");
+   if (actions)
+      actions->preamble(cmt, cs, ds);
+}
+
+
+void VFReader::cmdPost () {
+	while ((readUnsigned(1)) == 248); // skip fill bytes
+	if (actions)
+		actions->postamble();
+}
+
+
+void VFReader::cmdLongChar () {
+	UInt32 pl  = readUnsigned(4);      // packet length (length of DVI subroutine)
+	if (actions) {
+		UInt32 cc  = readUnsigned(4);   // character code
+		readUnsigned(4);                // character width from corresponding TFM file
+		vector<UInt8> *dvi = new vector<UInt8>(pl); // DVI subroutine
+		readBytes(pl, *dvi);
+		actions->defineVFChar(cc, dvi); // call template method for user actions
+	}
+	else
+		in().seekg(8+pl, ios::cur);     // skip remaining char definition bytes
+}
+
+
+/** Reads and executes short_char_x command.
+ *  @param[in] pl packet length (length of DVI subroutine) */
+void VFReader::cmdShortChar (int pl) {
+	if (actions) {
+		UInt32 cc  = readUnsigned(1);   // character code
+		readUnsigned(3);                // character width from corresponding TFM file
+		vector<UInt8> *dvi = new vector<UInt8>(pl); // DVI subroutine
+		readBytes(pl, *dvi);
+		actions->defineVFChar(cc, dvi); // call template method for user actions
+	}
+	else
+		in().seekg(4+pl, ios::cur);     // skip char definition bytes
+}
+
+
+void VFReader::cmdFontDef (int len) {
+	UInt32 fontnum  = readUnsigned(len);   // font number
+	UInt32 checksum = readUnsigned(4);     // font checksum (to be compared with corresponding TFM checksum)
+	UInt32 ssize    = readUnsigned(4);     // scaled size of font relative to design size (fix_word)
+	UInt32 dsize    = readUnsigned(4);     // design size of font (same as TFM design size) (fix_word)
+	UInt32 pathlen  = readUnsigned(1);     // length of font path
+	UInt32 namelen  = readUnsigned(1);     // length of font name
+	string fontpath = readString(pathlen);
+	string fontname = readString(namelen);
+	if (actions) {
+		double ss = fix2double(ssize);
+		double ds = fix2double(dsize);
+		actions->defineVFFont(fontnum, fontpath, fontname, checksum, ds, ss*designSize);
+	}
+}