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|
/*************************************************************************
** DVIReader.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2015 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 <config.h>
#include <algorithm>
#include <cstdarg>
#include <fstream>
#include <iostream>
#include <sstream>
#include "Color.h"
#include "DVIActions.h"
#include "DVIReader.h"
#include "Font.h"
#include "FontManager.h"
#include "Message.h"
#include "SignalHandler.h"
#include "VectorStream.h"
#include "macros.h"
#include "types.h"
using namespace std;
bool DVIReader::COMPUTE_PROGRESS = false;
DVIReader::DVIReader (istream &is, DVIActions *a) : BasicDVIReader(is), _actions(a)
{
_inPage = false;
_pageHeight = _pageWidth = 0;
_dvi2bp = 0.0;
_tx = _ty = 0; // no cursor translation
_prevYPos = numeric_limits<double>::min();
_inPostamble = false;
_currFontNum = 0;
_currPageNum = 0;
_pagePos = 0;
_mag = 1;
executePreamble();
collectBopOffsets();
executePostamble();
}
DVIActions* DVIReader::replaceActions (DVIActions *a) {
DVIActions *prev_actions = _actions;
_actions = a;
return prev_actions;
}
/** Reads a single DVI command from the current position of the input stream and calls the
* corresponding cmdFOO method.
* @return opcode of the command executed */
int DVIReader::executeCommand () {
SignalHandler::instance().check();
CommandHandler handler;
int param; // parameter of handler
const streampos cmdpos = tell();
int opcode = evalCommand(handler, param);
(this->*handler)(param);
if (_dviState.v+_ty != _prevYPos) {
_tx = _ty = 0;
_prevYPos = _dviState.v;
}
if (COMPUTE_PROGRESS && _inPage && _actions) {
size_t pagelen = numberOfPageBytes(_currPageNum-1);
// ensure progress() is called at 0%
if (opcode == 139) // bop?
_actions->progress(0, pagelen);
// ensure progress() is called at 100%
if (peek() == 140) // eop reached?
_pagePos = pagelen;
else
_pagePos += tell()-cmdpos;
_actions->progress(_pagePos, pagelen);
}
return opcode;
}
/** Executes all DVI commands read from the input stream. */
void DVIReader::executeAll () {
int opcode = 0;
while (!eof() && opcode >= 0) {
try {
opcode = executeCommand();
}
catch (const InvalidDVIFileException &e) {
// end of stream reached
opcode = -1;
}
}
}
/** Reads and executes the commands of a single page.
* This methods stops reading after the page's eop command has been executed.
* @param[in] n number of page to be executed
* @returns true if page was read successfully */
bool DVIReader::executePage (unsigned n) {
clearStream(); // reset all status bits
if (!isStreamValid())
throw DVIException("invalid DVI file");
if (n < 1 || n > numberOfPages())
return false;
seek(_bopOffsets[n-1]); // goto bop of n-th page
_inPostamble = false; // not in postamble
_currPageNum = n;
while (executeCommand() != 140); // 140 == eop
return true;
}
void DVIReader::executePreamble () {
clearStream();
if (isStreamValid()) {
seek(0);
if (readByte() == 247) {
cmdPre(0);
return;
}
}
throw DVIException("invalid DVI file");
}
/** Moves stream pointer to begin of postamble */
static void to_postamble (StreamReader &reader) {
reader.clearStream();
if (!reader.isStreamValid())
throw DVIException("invalid DVI file");
reader.seek(-1, ios::end); // stream pointer to last byte
int count=0;
while (reader.peek() == 223) {
reader.seek(-1, ios::cur); // skip fill bytes
count++;
}
if (count < 4) // the standard requires at least 4 trailing fill bytes
throw DVIException("missing fill bytes at end of file");
reader.seek(-4, ios::cur); // now on first byte of q (pointer to begin of postamble)
UInt32 q = reader.readUnsigned(4); // pointer to begin of postamble
reader.seek(q); // now on begin of postamble
}
/** Reads and executes the commands of the postamble. */
void DVIReader::executePostamble () {
to_postamble(*this);
while (executeCommand() != 249); // executes all commands until post_post (= 249) is reached
}
/** Collects and records the file offsets of all bop commands. */
void DVIReader::collectBopOffsets () {
to_postamble(*this);
_bopOffsets.push_back(tell()); // also add offset of postamble
readByte(); // skip post command
UInt32 offset = readUnsigned(4); // offset of final bop
while ((Int32)offset > 0) { // not yet on first bop?
_bopOffsets.push_back(offset); // record offset
seek(offset+41); // skip bop command and the 10 \count values => now on offset of previous bop
offset = readUnsigned(4);
}
reverse(_bopOffsets.begin(), _bopOffsets.end());
}
/** Returns the current x coordinate in PS point units.
* This is the horizontal position where the next output would be placed. */
double DVIReader::getXPos () const {
return _dviState.h+_tx;
}
/** Returns the current y coordinate in PS point units.
* This is the vertical position where the next output would be placed. */
double DVIReader::getYPos () const {
return _dviState.v+_ty;
}
/////////////////////////////////////
/** Reads and executes DVI preamble command.
* Format: pre ver[1] num[4] den[4] mag[4] cmtlen[1] cmt[cmtlen] */
void DVIReader::cmdPre (int) {
setDVIFormat((DVIFormat)readUnsigned(1)); // identification number
UInt32 num = readUnsigned(4); // numerator units of measurement
UInt32 den = readUnsigned(4); // denominator units of measurement
if (den == 0)
throw DVIException("denominator of measurement unit is zero");
_mag = readUnsigned(4); // magnification
UInt32 k = readUnsigned(1); // length of following comment
string cmt = readString(k); // comment
// 1 dviunit * num/den == multiples of 0.0000001m
// 1 dviunit * _dvibp: length of 1 dviunit in PS points * _mag/1000
_dvi2bp = num/254000.0*72.0/den*_mag/1000.0;
if (_actions)
_actions->preamble(cmt);
}
/** Reads and executes DVI postamble command.
* Format: post p[4] num[4] den[4] mag[4] ph[4] pw[4] sd[2] np[2] */
void DVIReader::cmdPost (int) {
readUnsigned(4); // skip pointer to previous bop
UInt32 num = readUnsigned(4);
UInt32 den = readUnsigned(4);
if (den == 0)
throw DVIException("denominator of measurement unit is zero");
_mag = readUnsigned(4);
_pageHeight = readUnsigned(4); // height of tallest page in dvi units
_pageWidth = readUnsigned(4); // width of widest page in dvi units
readUnsigned(2); // skip max. stack depth
if (readUnsigned(2) != numberOfPages())
throw DVIException("page count entry doesn't match actual number of pages");
// 1 dviunit * num/den == multiples of 0.0000001m
// 1 dviunit * _dvi2bp: length of 1 dviunit in PS points * _mag/1000
_dvi2bp = num/254000.0*72.0/den*_mag/1000.0;
_pageHeight *= _dvi2bp; // to pt units
_pageWidth *= _dvi2bp;
_inPostamble = true;
if (_actions)
_actions->postamble();
}
/** Reads and executes DVI post_post command.
* Format: post_post q[4] i[1] 223[>=4] */
void DVIReader::cmdPostPost (int) {
_inPostamble = false;
readUnsigned(4); // pointer to begin of postamble
setDVIFormat((DVIFormat)readUnsigned(1)); // identification byte
while (readUnsigned(1) == 223); // skip fill bytes (223), eof bit should be set now
}
/** Reads and executes Begin-Of-Page command.
* Format: bop c0[+4] ... c9[+4] p[+4] */
void DVIReader::cmdBop (int) {
Int32 c[10];
for (int i=0; i < 10; i++)
c[i] = readSigned(4);
readSigned(4); // pointer to peceeding bop (-1 in case of first page)
_dviState.reset(); // set all DVI registers to 0
while (!_stateStack.empty())
_stateStack.pop();
_currFontNum = 0;
_inPage = true;
_pagePos = 0;
beginPage(_currPageNum, c);
if (_actions)
_actions->beginPage(_currPageNum, c);
}
/** Reads and executes End-Of-Page command. */
void DVIReader::cmdEop (int) {
if (!_stateStack.empty())
throw DVIException("stack not empty at end of page");
_inPage = false;
endPage(_currPageNum);
if (_actions)
_actions->endPage(_currPageNum);
}
/** Reads and executes push command. */
void DVIReader::cmdPush (int) {
_stateStack.push(_dviState);
}
/** Reads and executes pop command (restores pushed position information). */
void DVIReader::cmdPop (int) {
if (_stateStack.empty())
throw DVIException("stack empty at pop command");
else {
DVIState prevState = _dviState;
_dviState = _stateStack.top();
_stateStack.pop();
if (_actions) {
if (prevState.h != _dviState.h)
_actions->moveToX(_dviState.h + _tx);
if (prevState.v != _dviState.v)
_actions->moveToY(_dviState.v + _ty);
if (prevState.d != _dviState.d)
_actions->setTextOrientation(_dviState.d != WMODE_LR);
}
}
}
/** Helper function that actually sets/puts a charater. It is called by the
* cmdSetChar and cmdPutChar methods.
* @param[in] c character to typeset
* @param[in] moveCursor if true, register h is increased by the character width
* @throw DVIException if method is called ouside a bop/eop pair */
void DVIReader::putChar (UInt32 c, bool moveCursor) {
if (!_inPage)
throw DVIException("set_char/put_char outside of page");
FontManager &fm = FontManager::instance();
Font *font = fm.getFont(_currFontNum);
if (!font)
throw DVIException("no font selected");
if (VirtualFont *vf = dynamic_cast<VirtualFont*>(font)) { // is current font a virtual font?
vector<UInt8> *dvi = const_cast<vector<UInt8>*>(vf->getDVI(c)); // get DVI snippet that describes character c
if (dvi) {
DVIState pos = _dviState; // save current cursor position
_dviState.x = _dviState.y = _dviState.w = _dviState.z = 0;
int save_fontnum = _currFontNum; // save current font number
fm.enterVF(vf); // new font number context
cmdFontNum0(fm.vfFirstFontNum(vf));
double save_scale = _dvi2bp;
// DVI units in virtual fonts are multiples of 1^(-20) times the scaled size of the VF
_dvi2bp = vf->scaledSize()/(1 << 20);
VectorInputStream<UInt8> vis(*dvi);
istream &is = replaceStream(vis);
try {
executeAll(); // execute DVI fragment
}
catch (const DVIException &e) {
// Message::estream(true) << "invalid dvi in vf: " << e.getMessage() << endl; // @@
}
replaceStream(is); // restore previous input stream
_dvi2bp = save_scale; // restore previous scale factor
fm.leaveVF(); // restore previous font number context
cmdFontNum0(save_fontnum); // restore previous font number
_dviState = pos; // restore previous cursor position
}
}
else if (_actions)
_actions->setChar(_dviState.h+_tx, _dviState.v+_ty, c, _dviState.d != WMODE_LR, font);
if (moveCursor) {
double dist = font->charWidth(c) * font->scaleFactor() * _mag/1000.0;
switch (_dviState.d) {
case WMODE_LR: _dviState.h += dist; break;
case WMODE_TB: _dviState.v += dist; break;
case WMODE_BT: _dviState.v -= dist; break;
}
}
}
/** Reads and executes set_char_x command. Puts a character at the current
* position and advances the cursor.
* @param[in] c character to set
* @throw DVIException if method is called ouside a bop/eop pair */
void DVIReader::cmdSetChar0 (int c) {
putChar(c, true);
}
/** Reads and executes setx command. Puts a character at the current
* position and advances the cursor.
* @param[in] len number of parameter bytes (possible values: 1-4)
* @throw DVIException if method is called ouside a bop/eop pair */
void DVIReader::cmdSetChar (int len) {
// According to the dvi specification all character codes are unsigned
// except len == 4. At the moment all char codes are treated as unsigned...
UInt32 c = readUnsigned(len); // if len == 4 c may be signed
putChar(c, true);
}
/** Reads and executes putx command. Puts a character at the current
* position but doesn't change the cursor position.
* @param[in] len number of parameter bytes (possible values: 1-4)
* @throw DVIException if method is called ouside a bop/eop pair */
void DVIReader::cmdPutChar (int len) {
// According to the dvi specification all character codes are unsigned
// except len == 4. At the moment all char codes are treated as unsigned...
Int32 c = readUnsigned(len);
putChar(c, false);
}
/** Reads and executes set_rule command. Puts a solid rectangle at the current
* position and updates the cursor position.
* Format: set_rule h[+4] w[+4]
* @throw DVIException if method is called ouside a bop/eop pair */
void DVIReader::cmdSetRule (int) {
if (!_inPage)
throw DVIException("set_rule outside of page");
double height = _dvi2bp*readSigned(4);
double width = _dvi2bp*readSigned(4);
if (_actions && height > 0 && width > 0)
_actions->setRule(_dviState.h+_tx, _dviState.v+_ty, height, width);
moveRight(width);
}
/** Reads and executes set_rule command. Puts a solid rectangle at the current
* position but leaves the cursor position unchanged.
* Format: put_rule h[+4] w[+4]
* @throw DVIException if method is called ouside a bop/eop pair */
void DVIReader::cmdPutRule (int) {
if (!_inPage)
throw DVIException("put_rule outside of page");
double height = _dvi2bp*readSigned(4);
double width = _dvi2bp*readSigned(4);
if (_actions && height > 0 && width > 0)
_actions->setRule(_dviState.h+_tx, _dviState.v+_ty, height, width);
}
void DVIReader::moveRight (double dx) {
switch (_dviState.d) {
case WMODE_LR: _dviState.h += dx; break;
case WMODE_TB: _dviState.v += dx; break;
case WMODE_BT: _dviState.v -= dx; break;
}
if (_actions) {
if (_dviState.d == WMODE_LR)
_actions->moveToX(_dviState.h+_tx);
else
_actions->moveToY(_dviState.v+_ty);
}
}
void DVIReader::moveDown (double dy) {
switch (_dviState.d) {
case WMODE_LR: _dviState.v += dy; break;
case WMODE_TB: _dviState.h -= dy; break;
case WMODE_BT: _dviState.h += dy; break;
}
if (_actions) {
if (_dviState.d == WMODE_LR)
_actions->moveToY(_dviState.v+_ty);
else
_actions->moveToX(_dviState.h+_tx);
}
}
void DVIReader::cmdRight (int len) {moveRight(_dvi2bp*readSigned(len));}
void DVIReader::cmdDown (int len) {moveDown(_dvi2bp*readSigned(len));}
void DVIReader::cmdX0 (int) {moveRight(_dviState.x);}
void DVIReader::cmdY0 (int) {moveDown(_dviState.y);}
void DVIReader::cmdW0 (int) {moveRight(_dviState.w);}
void DVIReader::cmdZ0 (int) {moveDown(_dviState.z);}
void DVIReader::cmdX (int len) {_dviState.x = _dvi2bp*readSigned(len); cmdX0(0);}
void DVIReader::cmdY (int len) {_dviState.y = _dvi2bp*readSigned(len); cmdY0(0);}
void DVIReader::cmdW (int len) {_dviState.w = _dvi2bp*readSigned(len); cmdW0(0);}
void DVIReader::cmdZ (int len) {_dviState.z = _dvi2bp*readSigned(len); cmdZ0(0);}
void DVIReader::cmdNop (int) {}
/** Sets the text orientation (horizontal, vertical).
* This command is only available in DVI files of format 3 (created by pTeX) */
void DVIReader::cmdDir (int) {
UInt8 wmode = readUnsigned(1);
if (wmode == 4) // yoko mode (4) equals default LR mode (0)
wmode = 0;
if (wmode == 2 || wmode > 3) {
ostringstream oss;
oss << "invalid writing mode value " << wmode << " (0, 1, or 3 expected)";
throw DVIException(oss.str());
}
_dviState.d = (WritingMode)wmode;
if (_actions)
_actions->setTextOrientation(_dviState.d != WMODE_LR);
}
void DVIReader::cmdXXX (int len) {
if (!_inPage)
throw DVIException("special outside of page");
UInt32 numBytes = readUnsigned(len);
string s = readString(numBytes);
if (_actions)
_actions->special(s, _dvi2bp);
}
/** Selects a previously defined font by its number.
* @param[in] num font number
* @throw DVIException if font number is undefined */
void DVIReader::cmdFontNum0 (int num) {
if (Font *font = FontManager::instance().getFont(num)) {
_currFontNum = num;
if (_actions && !dynamic_cast<VirtualFont*>(font))
_actions->setFont(FontManager::instance().fontID(num), font); // all fonts get a recomputed ID
}
else {
ostringstream oss;
oss << "undefined font number " << num;
throw DVIException(oss.str());
}
}
/** Selects a previously defined font.
* @param[in] len size of font number variable (in bytes)
* @throw DVIException if font number is undefined */
void DVIReader::cmdFontNum (int len) {
UInt32 num = readUnsigned(len);
cmdFontNum0(num);
}
/** Helper function to handle a font definition.
* @param[in] fontnum local font number
* @param[in] name font name
* @param[in] cs checksum to be compared with TFM checksum
* @param[in] ds design size in PS point units
* @param[in] ss scaled size in PS point units */
void DVIReader::defineFont (UInt32 fontnum, const string &name, UInt32 cs, double ds, double ss) {
if (!_inPostamble) // only process font definitions collected in the postamble; skip all others
return;
FontManager &fm = FontManager::instance();
int id = fm.registerFont(fontnum, name, cs, ds, ss);
Font *font = fm.getFontById(id);
if (VirtualFont *vf = dynamic_cast<VirtualFont*>(font)) {
// read vf file, register its font and character definitions
fm.enterVF(vf);
ifstream ifs(vf->path(), ios::binary);
VFReader vfReader(ifs);
vfReader.replaceActions(this);
vfReader.executeAll();
fm.leaveVF();
}
if (_actions)
_actions->defineFont(id, font);
}
/** Defines a new font.
* @param[in] len size of font number variable (in bytes) */
void DVIReader::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 in DVI units
UInt32 dsize = readUnsigned(4); // design size of font in DVI units
UInt32 pathlen = readUnsigned(1); // length of font path
UInt32 namelen = readUnsigned(1); // length of font name
readString(pathlen); // skip font path
string fontname = readString(namelen);
defineFont(fontnum, fontname, checksum, dsize*_dvi2bp, ssize*_dvi2bp);
}
/** This template method is called by the VFReader after reading a font definition from a VF file.
* @param[in] fontnum local font number
* @param[in] path path to font file
* @param[in] name font name
* @param[in] checksum checksum to be compared with TFM checksum
* @param[in] dsize design size in PS point units
* @param[in] ssize scaled size in PS point units */
void DVIReader::defineVFFont (UInt32 fontnum, string path, string name, UInt32 checksum, double dsize, double ssize) {
if (VirtualFont *vf = FontManager::instance().getVF())
defineFont(fontnum, name, checksum, dsize, ssize * vf->scaleFactor());
}
/** This template method is called by the VFReader after reading a character definition from a VF file.
* @param[in] c character number
* @param[in] dvi DVI fragment describing the character */
void DVIReader::defineVFChar (UInt32 c, vector<UInt8> *dvi) {
FontManager::instance().assignVfChar(c, dvi);
}
/** XDV extension: includes image or pdf file.
* parameters: box[1] matrix[4][6] p[2] len[2] path[l] */
void DVIReader::cmdXPic (int) {
// just skip the parameters
readUnsigned(1); // box
for (int i=0; i < 6; i++) // matrix
readSigned(4);
readSigned(2); // page number
UInt16 len = readUnsigned(2);
readString(len); // path to image/pdf file
}
/** XDV extension: defines a native font */
void DVIReader::cmdXFontDef (int) {
Int32 fontnum = readSigned(4);
double ptsize = _dvi2bp*readUnsigned(4);
UInt16 flags = readUnsigned(2);
UInt8 psname_len = readUnsigned(1);
UInt8 fmname_len = readUnsigned(1);
UInt8 stname_len = readUnsigned(1);
string fontname = readString(psname_len);
readString(fmname_len);
readString(stname_len);
FontStyle style;
Color color;
if (flags & 0x0100) { // vertical?
}
if (flags & 0x0200) { // colored?
// The font color must not interfere with color specials. If the font color is not black,
// all color specials should be ignored, i.e. glyphs of a non-black fonts have a fixed color
// that can't be changed by color specials.
UInt32 rgba = readUnsigned(4);
color.setRGB(UInt8(rgba >> 24), UInt8((rgba >> 16) & 0xff), UInt8((rgba >> 8) & 0xff));
}
if (flags & 0x1000) // extend?
style.extend = _dvi2bp*readSigned(4);
if (flags & 0x2000) // slant?
style.slant = _dvi2bp*readSigned(4);
if (flags & 0x4000) // embolden?
style.bold = _dvi2bp*readSigned(4);
if (flags & 0x0800) { // variations?
UInt16 num_variations = readSigned(2);
for (int i=0; i < num_variations; i++)
readUnsigned(4);
}
if (_inPage)
FontManager::instance().registerFont(fontnum, fontname, ptsize, style, color);
}
/** XDV extension: prints an array of characters where each character
* can take independent x and y coordinates.
* parameters: w[4] n[2] x[4][n] y[4][n] c[2][n] */
void DVIReader::cmdXGlyphA (int) {
putGlyphArray(false);
}
/** XDV extension: prints an array/string of characters where each character
* can take independent x coordinates whereas all share a single y coordinate.
* parameters: w[4] n[2] x[4][n] y[4] c[2][n] */
void DVIReader::cmdXGlyphS (int) {
putGlyphArray(true);
}
/** Implements the common functionality of cmdXGlyphA and cmdXGlyphS.
* @param[in] xonly indicates if the characters share a single y coordinate (xonly==true) */
void DVIReader::putGlyphArray (bool xonly) {
double strwidth = _dvi2bp*readSigned(4);
UInt16 num_glyphs = readUnsigned(2);
vector<Int32> x(num_glyphs);
vector<Int32> y(num_glyphs);
for (int i=0; i < num_glyphs; i++) {
x[i] = readSigned(4);
y[i] = xonly ? 0 : readSigned(4);
}
if (!_actions)
seek(2*num_glyphs, ios::cur);
else {
if (Font *font = FontManager::instance().getFont(_currFontNum)) {
for (int i=0; i < num_glyphs; i++) {
UInt16 glyph_index = readUnsigned(2);
double xx = _dviState.h + x[i]*_dvi2bp + _tx;
double yy = _dviState.v + y[i]*_dvi2bp + _ty;
_actions->setChar(xx, yy, glyph_index, false, font);
}
}
}
moveRight(strwidth);
}
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