diff options
Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.cpp')
| -rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.cpp | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.cpp new file mode 100644 index 00000000000..9ca5ed39c27 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.cpp @@ -0,0 +1,357 @@ +/************************************************************************* +** PSInterpreter.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2014 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 <cstring> +#include <fstream> +#include <iostream> +#include <sstream> +#include "FileFinder.h" +#include "InputReader.h" +#include "Message.h" +#include "PSFilter.h" +#include "PSInterpreter.h" +#include "SignalHandler.h" + +using namespace std; + + +const char *PSInterpreter::GSARGS[] = { + "gs", // dummy name + "-q", // be quiet, suppress gs banner + "-dSAFER", // disallow writing of files + "-dNODISPLAY", // we don't need a display device + "-dNOPAUSE", // keep going + "-dWRITESYSTEMDICT", // leave systemdict writable as some operators must be replaced + "-dNOPROMPT", +// "-dNOBIND", +}; + + +/** Constructs a new PSInterpreter object. + * @param[in] actions template methods to be executed after recognizing the corresponding PS operator. */ +PSInterpreter::PSInterpreter (PSActions *actions) + : _mode(PS_NONE), _actions(actions), _filter(0), _bytesToRead(0), _inError(false), _initialized(false) +{ +} + + +void PSInterpreter::init () { + if (!_initialized) { + _gs.init(sizeof(GSARGS)/sizeof(char*), GSARGS, this); + _gs.set_stdio(input, output, error); + _initialized = true; + // Before executing any random PS code redefine some operators and run + // initializing PS code. This cannot be done in the constructor because we + // need the completely initialized PSInterpreter object here. + execute(PSDEFS); + } +} + + +PSActions* PSInterpreter::setActions (PSActions *actions) { + PSActions *old_actions = _actions; + _actions = actions; + return old_actions; +} + + +/** Checks if the given status value returned by Ghostscript indicates an error. + * @param[in] status status value returned by Ghostscript after the execution of a PS snippet + * @throw PSException if the status value indicates a PostScript error */ +void PSInterpreter::checkStatus (int status) { + if (status < 0) { + _mode = PS_QUIT; + if (status < -100) + throw PSException("fatal error"); + if (_errorMessage.empty()) + throw PSException(_gs.error_name(status)); + throw PSException(_errorMessage); + } +} + + +/** Executes a chunk of PostScript code. + * @param[in] str buffer containing the code + * @param[in] len number of characters in buffer + * @param[in] flush If true, a final 'flush' is sent which forces the output buffer to be written immediately. + * @return true if the assigned number of bytes have been read */ +bool PSInterpreter::execute (const char *str, size_t len, bool flush) { + init(); + if (_mode == PS_QUIT) + return false; + + int status=0; + if (_mode == PS_NONE) { + _gs.run_string_begin(0, &status); + _mode = PS_RUNNING; + } + checkStatus(status); + + bool complete=false; + if (_bytesToRead > 0 && len >= _bytesToRead) { + len = _bytesToRead; + complete = true; + } + + if (_filter && _filter->active()) { + PSFilter *filter = _filter; + _filter = 0; // prevent recursion when filter calls execute() + filter->execute(str, len); + if (filter->active()) // filter still active after execution? + _filter = filter; + return complete; + } + + // feed Ghostscript with code chunks that are not larger than 64KB + // => see documentation of gsapi_run_string_foo() + const char *p=str; + while (PS_RUNNING && len > 0) { + SignalHandler::instance().check(); + size_t chunksize = min(len, (size_t)0xffff); + _gs.run_string_continue(p, chunksize, 0, &status); + p += chunksize; + len -= chunksize; + if (_bytesToRead > 0) + _bytesToRead -= chunksize; + if (status == -101) // e_Quit + _mode = PS_QUIT; + else + checkStatus(status); + } + if (flush) { + // force writing contents of output buffer + _gs.run_string_continue("\nflush ", 7, 0, &status); + } + return complete; +} + + +/** Executes a chunk of PostScript code read from a stream. The method returns on EOF. + * @param[in] is the input stream + * @param[in] flush If true, a final 'flush' is sent which forces the output buffer to be written immediately. + * @return true if the assigned number of bytes have been read */ +bool PSInterpreter::execute (istream &is, bool flush) { + char buf[4096]; + bool finished = false; + while (is && !is.eof() && !finished) { + is.read(buf, 4096); + finished = execute(buf, is.gcount(), false); + } + execute("\n", 1, flush); + return finished; +} + + +bool PSInterpreter::executeRaw (const string &str, int n) { + _rawData.clear(); + ostringstream oss; + oss << str << ' ' << n << " (raw) prcmd\n"; + execute(oss.str()); + return !_rawData.empty(); +} + + +/** This callback function handles input from stdin to Ghostscript. Currently not needed. + * @param[in] inst pointer to calling instance of PSInterpreter + * @param[in] buf takes the read characters + * @param[in] len size of buffer buf + * @return number of characters read */ +int GSDLLCALL PSInterpreter::input (void *inst, char *buf, int len) { + return 0; +} + + +/** This callback function handles output from Ghostscript to stdout. It looks for + * emitted commands staring with "dvi." and executes them by calling method callActions. + * Ghostscript sends the text in chunks by several calls of this function. + * Unfortunately, the PostScript specification wants error messages also to be sent to stdout + * instead of stderr. Thus, we must collect and concatenate the chunks until an evaluable text + * snippet is completely received. Furthermore, error messages have to be recognized and to be + * filtered out. + * @param[in] inst pointer to calling instance of PSInterpreter + * @param[in] buf contains the characters to be output + * @param[in] len number of characters in buf + * @return number of processed characters (equals 'len') */ +int GSDLLCALL PSInterpreter::output (void *inst, const char *buf, int len) { + PSInterpreter *self = static_cast<PSInterpreter*>(inst); + if (self && self->_actions) { + const size_t MAXLEN = 512; // maximal line length (longer lines are of no interest) + const char *end = buf+len-1; // last position of buf + for (const char *first=buf, *last=buf; first <= end; last++, first=last) { + // move first and last to begin and end of the next line, respectively + while (last < end && *last != '\n') + last++; + size_t linelength = last-first+1; + if (linelength > MAXLEN) // skip long lines since they don't contain any relevant information + continue; + + vector<char> &linebuf = self->_linebuf; // just a shorter name... + if ((*last == '\n' || !self->active()) || self->_inError) { + if (linelength + linebuf.size() > 1) { // prefix "dvi." plus final newline + SplittedCharInputBuffer ib(linebuf.empty() ? 0 : &linebuf[0], linebuf.size(), first, linelength); + BufferInputReader in(ib); + if (self->_inError) + self->_errorMessage += string(first, linelength); + else { + in.skipSpace(); + if (in.check("Unrecoverable error: ")) { + self->_errorMessage.clear(); + while (!in.eof()) + self->_errorMessage += in.get(); + self->_inError = true; + } + else if (in.check("dvi.")) + self->callActions(in); + } + } + linebuf.clear(); + } + else { // no line end found => + // save remaining characters and prepend them to the next incoming chunk of characters + if (linebuf.size() + linelength > MAXLEN) + linebuf.clear(); // don't care for long lines + else { + size_t currsize = linebuf.size(); + linebuf.resize(currsize+linelength); + memcpy(&linebuf[currsize], first, linelength); + } + } + } + } + return len; +} + + +/** Converts a vector of strings to a vector of doubles. + * @param[in] str the strings to be converted + * @param[out] d the resulting doubles */ +static void str2double (const vector<string> &str, vector<double> &d) { + for (size_t i=0; i < str.size(); i++) { + istringstream iss(str[i]); + iss >> d[i]; + } +} + + +/** Evaluates a command emitted by Ghostscript and invokes the corresponding + * method of interface class PSActions. + * @param[in] in reader pointing to the next command */ +void PSInterpreter::callActions (InputReader &in) { + // array of currently supported operators (must be ascendingly sorted) + static const struct Operator { + const char *name; // name of operator + int pcount; // number of parameters (< 0 : variable number of parameters) + void (PSActions::*op)(vector<double> &p); // operation handler + } operators [] = { + {"applyscalevals", 3, &PSActions::applyscalevals}, + {"clip", 0, &PSActions::clip}, + {"closepath", 0, &PSActions::closepath}, + {"curveto", 6, &PSActions::curveto}, + {"eoclip", 0, &PSActions::eoclip}, + {"eofill", 0, &PSActions::eofill}, + {"fill", 0, &PSActions::fill}, + {"grestore", 0, &PSActions::grestore}, + {"grestoreall", 0, &PSActions::grestoreall}, + {"gsave", 0, &PSActions::gsave}, + {"initclip", 0, &PSActions::initclip}, + {"lineto", 2, &PSActions::lineto}, + {"makepattern", -1, &PSActions::makepattern}, + {"moveto", 2, &PSActions::moveto}, + {"newpath", 0, &PSActions::newpath}, + {"querypos", 2, &PSActions::querypos}, + {"raw", -1, 0}, + {"restore", 1, &PSActions::restore}, + {"rotate", 1, &PSActions::rotate}, + {"save", 1, &PSActions::save}, + {"scale", 2, &PSActions::scale}, + {"setcmykcolor", 4, &PSActions::setcmykcolor}, + {"setdash", -1, &PSActions::setdash}, + {"setgray", 1, &PSActions::setgray}, + {"sethsbcolor", 3, &PSActions::sethsbcolor}, + {"setlinecap", 1, &PSActions::setlinecap}, + {"setlinejoin", 1, &PSActions::setlinejoin}, + {"setlinewidth", 1, &PSActions::setlinewidth}, + {"setmatrix", 6, &PSActions::setmatrix}, + {"setmiterlimit", 1, &PSActions::setmiterlimit}, + {"setopacityalpha", 1, &PSActions::setopacityalpha}, + {"setpattern", -1, &PSActions::setpattern}, + {"setrgbcolor", 3, &PSActions::setrgbcolor}, + {"stroke", 0, &PSActions::stroke}, + {"translate", 2, &PSActions::translate}, + }; + if (_actions) { + in.skipSpace(); + // binary search + int first=0, last=sizeof(operators)/sizeof(Operator)-1; + while (first <= last) { + int mid = first+(last-first)/2; + int cmp = in.compare(operators[mid].name); + if (cmp > 0) + last = mid-1; + else if (cmp < 0) + first = mid+1; + else { + if (!operators[mid].op) { // raw string data received + _rawData.clear(); + in.skipSpace(); + while (!in.eof()) { + _rawData.push_back(in.getString()); + in.skipSpace(); + } + } + else { + // collect parameters and call handler + vector<string> params; + int pcount = operators[mid].pcount; + if (pcount < 0) { // variable number of parameters? + in.skipSpace(); + while (!in.eof()) { // read all available parameters + params.push_back(in.getString()); + in.skipSpace(); + } + } + else { // fix number of parameters + for (int i=0; i < pcount; i++) { + in.skipSpace(); + params.push_back(in.getString()); + } + } + vector<double> v(params.size()); + str2double(params, v); + (_actions->*operators[mid].op)(v); + _actions->executed(); + } + break; + } + } + } +} + + +/** This callback function handles output from Ghostscript to stderr. + * @param[in] inst pointer to calling instance of PSInterpreter + * @param[in] buf contains the characters to be output + * @param[in] len number of chars in buf + * @return number of processed characters */ +int GSDLLCALL PSInterpreter::error (void *inst, const char *buf, int len) { + return len; +} + |