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added signal handler code

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This commit is contained in:
Stephen Gaito 2019-11-22 17:43:56 +00:00
parent 7e270ab497
commit 019db4e635
6 changed files with 329 additions and 6 deletions
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2
pdf2htmlEX/CMakeLists.txt
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@ -149,6 +149,8 @@ set(PDF2HTMLEX_SRC ${PDF2HTMLEX_SRC}
src/util/unicode.cc
src/util/mingw.h
src/util/mingw.cc
src/util/SignalHandler.h
src/util/SignalHandler.cc
src/ArgParser.h
src/ArgParser.cc
src/Base64Stream.h

14
pdf2htmlEX/src/pdf2htmlEX.cc
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@ -25,6 +25,8 @@
#include "pdf2htmlEX-config.h"
#include "util/SignalHandler.h"
#if ENABLE_SVG
#include <cairo.h>
#endif
@ -55,11 +57,15 @@ void show_usage_and_exit(const char * dummy = nullptr)
void show_version_and_exit(const char * dummy = nullptr)
{
const FFWVersionInfo* ffwVersionInfo = ffw_get_version_info();
cerr << "pdf2htmlEX version " << PDF2HTMLEX_VERSION << endl;
cerr << "Copyright 2012-2015 Lu Wang <coolwanglu@gmail.com> and other contributors" << endl;
cerr << "Libraries: " << endl;
cerr << " poppler " << POPPLER_VERSION << endl;
cerr << " libfontforge " << ffw_get_version() << endl;
cerr << " libfontforge " << ffwVersionInfo->majorVersion << "." <<
ffwVersionInfo->minorVersion << "." << ffwVersionInfo->gitVersion << endl;
cerr << " libfontforge (date) " << ffwVersionInfo->versionDate << endl;
#if ENABLE_SVG
cerr << " cairo " << cairo_version_string() << endl;
#endif
@ -394,6 +400,12 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE);
}
// setup the signal handler
setupSignalHandler(argc, (const char**)argv,
param.data_dir.c_str(),
param.poppler_data_dir.c_str(),
param.tmp_dir.c_str());
bool finished = false;
// read config file
globalParams = new GlobalParams(!param.poppler_data_dir.empty() ? param.poppler_data_dir.c_str() : NULL);

220
pdf2htmlEX/src/util/SignalHandler.cc Normal file
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@ -0,0 +1,220 @@
/*
* SignalHandler.cc
*
* Created on: 2019-Nov-14
* Author: Stephen Gaito
*/
/**********
This collection of basic ANSI-C functions implement a crude SIG-SEGV
handler for when things go horribly wrong ;-(
We implement them in as simple a maner as possible so that it will be as
portable as possible and less likely to fall into a reentrant deadlock.
At the moment the most critical SIG-SEGVs are happening inside the
FontForge library. So we start by focusing upon adding more helpful
messages when FontForge can't save a file for us.
**********/
#include <stdio.h>
#include <string.h>
#include <string>
#include <unistd.h>
#include <signal.h>
#include "pdf2htmlEX-config.h"
#include "util/ffw.h"
#include <cairo/cairo.h>
#include <poppler/poppler-config.h>
const char* oopsMessage =
"\n"
"\n"
"Oops! Something went horribly wrong.... sorry!\n"
"\n";
const char* ffwMessage_1 =
"I was in the middle of asking FontForge to ";
const char* ffwMessage_2 =
" a font.\n"
"\n"
"I suspect that the problem is that FontForge is having trouble\n"
"working with one of the fonts embedded in your pdf file.\n"
"\n"
"The best way to verify this is to install FontForge and to try\n"
"loading and then (re)generating each font in the\n"
"\n"
" ";
const char* ffwMessage_3 =
"\n"
"\n"
"directory. See:\n"
"\n"
" https://github.com/pdf2htmlEX/pdf2htmlEX/wiki/Troubleshooting-Crashes\n"
"\n"
"for details.\n"
"\n"
"If one of these fonts crashes FontForge, then it is certainly not a\n"
"pdf2htmlEX problem.... sorry.\n"
"\n"
"IF it *is* a FontForge problem then you have the following options:\n"
"\n"
" 1) You can send a copy of the font you found which crashed FontForge to\n"
" the FontForge developers and see if they can find the problem.\n"
" (Be warned FontForge is a complex application, so it might be\n"
" very hard for the developers to isolate your problem.... )\n"
"\n"
" 2) You can try re-creating your PDF with a different font.\n"
"\n"
" 3) Or you can do both of these things...\n"
"\n"
"IF you were not able to crash FontForge using the fonts in the above\n"
"directory... then and only then please raise an issue with the pdf2htmlEX\n"
"team... make sure you provide them with your pdf, as well as the following\n"
"details:\n";
const char* noFfwMessage =
"Please raise an issue with the pdf2hmtlEX team so they can fix this...\n"
"\n"
"Please make sure you provide them with your pdf as well as the following\n"
"details:\n";
const char* detailsHeader =
"\n"
"--------------------------------------------------------------------------\n"
"\n";
const char* detailsBody = "no details recorded\n";
const char* pdf2htmlEXTmpDir = NULL;
const char* ffwAction = NULL;
struct sigaction act;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-result"
void signalHandler(int sigInt) {
write(STDERR_FILENO, oopsMessage, strlen(oopsMessage) );
if (ffwAction) {
write(STDERR_FILENO, ffwMessage_1, strlen(ffwMessage_1) );
write(STDERR_FILENO, ffwAction, strlen(ffwAction) );
write(STDERR_FILENO, ffwMessage_2, strlen(ffwMessage_2) );
write(STDERR_FILENO, pdf2htmlEXTmpDir, strlen(pdf2htmlEXTmpDir) );
write(STDERR_FILENO, ffwMessage_3, strlen(ffwMessage_3) );
} else {
write(STDERR_FILENO, noFfwMessage, strlen(noFfwMessage) );
}
write(STDERR_FILENO, detailsHeader, strlen(detailsHeader) );
write(STDERR_FILENO, detailsBody, strlen(detailsBody) );
exit(-1);
}
#pragma GCC diagnostic pop
#ifdef __cplusplus
extern "C" {
#endif
void ffwSetAction(const char* anAction) { ffwAction = anAction; }
void ffwClearAction(const char* anAction) { ffwAction = NULL; }
#ifdef __cplusplus
}
#endif
void setupSignalHandler(
int argc, const char* argv[],
const char* data_dir,
const char* poppler_data_dir,
const char* tmp_dir) {
// THIS MUST BE CALLED AFTER ARGUMENT PARSING
// Start by setting up the messages
//
// Construct the command line information
std::string detailInfo;
detailInfo = "Command line:\n";
for (int i = 0 ; i < argc ; i++ ){
detailInfo = detailInfo + " " + std::to_string(i) + ": [" + argv[i] + "]\n" ;
}
detailInfo = detailInfo + "\n";
// Construct the version information
const pdf2htmlEX::FFWVersionInfo* ffwVersionInfo =
pdf2htmlEX::ffw_get_version_info();
detailInfo = detailInfo + "Version information:\n";
detailInfo = detailInfo + " pdf2htmlEX version " + pdf2htmlEX::PDF2HTMLEX_VERSION + "\n";
detailInfo = detailInfo + " Copyright 2012-2015 Lu Wang <coolwanglu@gmail.com> and other contributors\n";
detailInfo = detailInfo + "\n";
detailInfo = detailInfo + "Libraries:\n" ;
detailInfo = detailInfo + " poppler " + POPPLER_VERSION + "\n";
detailInfo = detailInfo + " libfontforge " + ffwVersionInfo->majorVersion + "." + ffwVersionInfo->minorVersion + "." + ffwVersionInfo->gitVersion + "\n";
detailInfo = detailInfo + " libfontforge (date) " + ffwVersionInfo->versionDate + "\n";
#if ENABLE_SVG
detailInfo = detailInfo + " cairo " + cairo_version_string() + "\n";
#endif
detailInfo = detailInfo + "\n";
detailInfo = detailInfo + "Default data-dir: " + data_dir + "\n";
detailInfo = detailInfo + "Default poppler-data-dir: " + poppler_data_dir + "\n";
detailInfo = detailInfo + "Default tmp-dir: " + tmp_dir + "\n";
detailInfo = detailInfo + "\n";
detailInfo = detailInfo + "Supported image formats:";
#ifdef ENABLE_LIBPNG
detailInfo = detailInfo + " png";
#endif
#ifdef ENABLE_LIBJPEG
detailInfo = detailInfo + " jpg";
#endif
#if ENABLE_SVG
detailInfo = detailInfo + " svg";
#endif
detailInfo = detailInfo + "\n\n";
detailsBody = strdup(detailInfo.c_str());
pdf2htmlEXTmpDir = strdup(tmp_dir);
// Now setup the signal handler
//
memset(&act, 0, sizeof(act));
act.sa_handler = signalHandler;
//
sigaction(SIGILL, &act, NULL); // Illegal Instruction
sigaction(SIGFPE, &act, NULL); // Floating-point exception
sigaction(SIGSEGV, &act, NULL); // Invalid memory reference
sigaction(SIGBUS, &act, NULL); // Bus error (bad memory access)
sigaction(SIGSYS, &act, NULL); // Bad system call (SVr4)
// All done
}
/***
int main(int argc, const char* argv[]) {
setupSignalHandler(argc, argv, "aTmpDir");
ffwSetAction("save");
for (int i = 0; i < 5; i++) {
printf("sleeping.... \n");
sleep(1);
}
int *foo = NULL;
*foo = 1;
printf("We should not reach here!\n");
}
***/

21
pdf2htmlEX/src/util/SignalHandler.h Normal file
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@ -0,0 +1,21 @@
#ifndef SIGNAL_HANDLER_H
#define SIGNAL_HANDLER_H
#ifdef __cplusplus
extern "C" {
#endif
void ffwSetAction(const char* anAction);
void ffwClearAction(void);
#ifdef __cplusplus
}
#endif
void setupSignalHandler(
int argc, const char* argv[],
const char* data_dir,
const char* poppler_data_dir,
const char* tmp_dir);
#endif

68
pdf2htmlEX/src/util/ffw.c
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@ -16,6 +16,8 @@
#include <fontforge.h>
#include <baseviews.h>
#include "SignalHandler.h"
#include "ffw.h"
#include "fontforge-2.0.20170731/autowidth.h"
#include "fontforge-2.0.20170731/bitmapchar.h"
@ -66,6 +68,7 @@ static void dumb_post_error(const char * title, const char * error, ...) { }
void ffw_init(int debug)
{
ffwSetAction("initialize");
InitSimpleStuff();
if ( default_encoding==NULL )
default_encoding=FindOrMakeEncoding("ISO8859-1");
@ -88,10 +91,12 @@ void ffw_init(int debug)
v.u.ival = 1;
SetPrefs("DetectDiagonalStems", &v, NULL);
}
ffwClearAction();
}
void ffw_finalize(void)
{
ffwSetAction("finalize");
while(enc_head)
{
Encoding * next = enc_head->next;
@ -107,21 +112,36 @@ void ffw_finalize(void)
free(enc_head);
enc_head = next;
}
ffwClearAction();
}
long ffw_get_version(void)
// see: https://stackoverflow.com/a/2653351
#define xstr(a) str(a)
#define str(a) #a
static FFWVersionInfo ffwVersionInfo;
const FFWVersionInfo* ffw_get_version_info(void)
{
return FONTFORGE_VERSIONDATE_RAW;
ffwVersionInfo.gitVersion = FONTFORGE_GIT_VERSION;
ffwVersionInfo.majorVersion = xstr(FONTFORGE_VERSION_MAJOR);
ffwVersionInfo.minorVersion = xstr(FONTFORGE_VERSION_MINOR);
ffwVersionInfo.versionDate = FONTFORGE_VERSIONDATE;
return &ffwVersionInfo;
}
void ffw_new_font()
{
ffwSetAction("create");
assert((cur_fv == NULL) && "Previous font is not destroyed");
cur_fv = FVAppend(_FontViewCreate(SplineFontNew()));
ffwClearAction();
}
void ffw_load_font(const char * filename)
{
ffwSetAction("load");
assert((cur_fv == NULL) && "Previous font is not destroyed");
char * _filename = strcopy(filename);
@ -147,6 +167,7 @@ void ffw_load_font(const char * filename)
cur_fv->cidmaster->ascent = cur_fv->sf->ascent;
cur_fv->cidmaster->descent = cur_fv->sf->descent;
}
ffwClearAction();
}
/*
@ -154,6 +175,7 @@ void ffw_load_font(const char * filename)
*/
void ffw_prepare_font(void)
{
ffwSetAction("prepare");
memset(cur_fv->selected, 1, cur_fv->map->enccount);
// remove kern
FVRemoveKerns(cur_fv);
@ -185,10 +207,12 @@ void ffw_prepare_font(void)
*/
free(sf->fontname);
sf->fontname = strcopy("");
ffwClearAction();
}
void ffw_save(const char * filename)
{
ffwSetAction("save");
char * _filename = strcopy(filename);
char * _ = strcopy("");
@ -200,11 +224,14 @@ void ffw_save(const char * filename)
if(!r)
err("Cannot save font to %s\n", filename);
ffwClearAction();
}
void ffw_close(void)
{
ffwSetAction("close");
FontViewClose(cur_fv);
cur_fv = NULL;
ffwClearAction();
}
static void ffw_do_reencode(Encoding * encoding, int force)
@ -234,25 +261,32 @@ static void ffw_do_reencode(Encoding * encoding, int force)
void ffw_reencode_glyph_order(void)
{
ffwSetAction("re-encode the glyph order in");
ffw_do_reencode(original_enc, 0);
ffwClearAction();
}
void ffw_reencode_unicode_full(void)
{
ffwSetAction("re-encode to unicode");
ffw_do_reencode(unicodefull_enc, 0);
ffwClearAction();
}
void ffw_reencode(const char * encname, int force)
{
ffwSetAction("re-encode");
Encoding * enc = FindOrMakeEncoding(encname);
if(!enc)
err("Unknown encoding %s\n", encname);
ffw_do_reencode(enc, force);
ffwClearAction();
}
void ffw_reencode_raw(int32 * mapping, int mapping_len, int force)
{
ffwSetAction("re-encode (raw1)");
Encoding * enc = calloc(1, sizeof(Encoding));
enc->only_1byte = enc->has_1byte = true;
@ -273,10 +307,12 @@ void ffw_reencode_raw(int32 * mapping, int mapping_len, int force)
enc_head = enc;
ffw_do_reencode(enc, force);
ffwClearAction();
}
void ffw_reencode_raw2(const char ** mapping, int mapping_len, int force)
{
ffwSetAction("re-encode (raw2)");
Encoding * enc = calloc(1, sizeof(Encoding));
enc->enc_name = strcopy("");
enc->char_cnt = mapping_len;
@ -300,6 +336,7 @@ void ffw_reencode_raw2(const char ** mapping, int mapping_len, int force)
enc_head = enc;
ffw_do_reencode(enc, force);
ffwClearAction();
}
void ffw_cidflatten(void)
@ -309,7 +346,9 @@ void ffw_cidflatten(void)
fprintf(stderr, "Cannot flatten a non-CID font\n");
return;
}
ffwSetAction("flatten the cid in");
SFFlatten(cur_fv->sf->cidmaster);
ffwClearAction();
}
/*
@ -318,6 +357,7 @@ void ffw_cidflatten(void)
*/
void ffw_add_empty_char(int32_t unicode, int width)
{
ffwSetAction("add an empty character to");
SplineChar * sc = SFMakeChar(cur_fv->sf, cur_fv->map, cur_fv->map->enccount);
char buffer[400];
SCSetMetaData(sc,
@ -325,22 +365,29 @@ void ffw_add_empty_char(int32_t unicode, int width)
cur_fv->sf->uni_interp, cur_fv->sf->for_new_glyphs)),
unicode, sc->comment);
SCSynchronizeWidth(sc, width, sc->width, cur_fv);
ffwClearAction();
}
int ffw_get_em_size(void)
{
return cur_fv->sf->ascent + cur_fv->sf->descent;
ffwSetAction("get the em size of");
int emSize = cur_fv->sf->ascent + cur_fv->sf->descent;
ffwClearAction();
return emSize;
}
void ffw_fix_metric()
{
ffwSetAction("fix the metric of");
double ascent, descent;
ffw_get_metric(&ascent, &descent);
ffw_set_metric(ascent, descent);
ffwClearAction();
}
void ffw_get_metric(double * ascent, double * descent)
{
ffwSetAction("get the metric of");
SplineFont * sf = cur_fv->sf;
DBounds bb;
@ -357,10 +404,12 @@ void ffw_get_metric(double * ascent, double * descent)
{
*ascent = *descent = 0;
}
ffwClearAction();
}
void ffw_set_metric(double ascent, double descent)
{
ffwSetAction("set the metric of");
SplineFont * sf = cur_fv->sf;
struct pfminfo * info = &sf->pfminfo;
@ -402,6 +451,7 @@ void ffw_set_metric(double ascent, double descent)
info->os2_typolinegap = 0;
info->linegap = 0;
ffwClearAction();
}
/*
@ -410,6 +460,7 @@ void ffw_set_metric(double ascent, double descent)
void ffw_set_widths(int * width_list, int mapping_len,
int stretch_narrow, int squeeze_wide)
{
ffwSetAction("set the widths of");
SplineFont * sf = cur_fv->sf;
if(sf->onlybitmaps
@ -453,13 +504,17 @@ void ffw_set_widths(int * width_list, int mapping_len,
SCSynchronizeWidth(sc, width_list[i], sc->width, cur_fv);
}
ffwClearAction();
}
void ffw_import_svg_glyph(int code, const char * filename, double ox, double oy, double width)
{
ffwSetAction("import the glyphs from");
int enc = SFFindSlot(cur_fv->sf, cur_fv->map, code, "");
if(enc == -1)
if(enc == -1) {
ffwClearAction();
return;
}
SplineChar * sc = SFMakeChar(cur_fv->sf, cur_fv->map, enc);
@ -483,10 +538,12 @@ void ffw_import_svg_glyph(int code, const char * filename, double ox, double oy,
SCSynchronizeWidth(sc, floor(width * (a+d) + 0.5), sc->width, cur_fv);
}
ffwClearAction();
}
void ffw_auto_hint(void)
{
ffwSetAction("automatically hint");
// convert to quadratic
if(!(cur_fv->sf->layers[ly_fore].order2))
{
@ -496,11 +553,14 @@ void ffw_auto_hint(void)
memset(cur_fv->selected, 1, cur_fv->map->enccount);
FVAutoHint(cur_fv);
FVAutoInstr(cur_fv);
ffwClearAction();
}
void ffw_override_fstype(void)
{
ffwSetAction("override the fstype of");
*(int16 *)(&cur_fv->sf->pfminfo.fstype) = 0;
cur_fv->sf->pfminfo.pfmset = true;
cur_fv->sf->changed = true;
ffwClearAction();
}

10
pdf2htmlEX/src/util/ffw.h
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@ -23,7 +23,15 @@ extern "C" {
// global
void ffw_init(int debug);
void ffw_finalize(void);
long ffw_get_version(void);
typedef struct ffw_version_info {
const char* gitVersion;
const char* majorVersion;
const char* minorVersion;
const char* versionDate;
} FFWVersionInfo ;
const FFWVersionInfo* ffw_get_version_info(void);
////////////////////////
// load & save