Tidy up careful_string_filter and add some extra transliterations.
[dcpomatic.git] / src / lib / util.cc
index 909a93ba8a368aadb8b241571a1a6ad640a1edc8..7d0d2bf606c698d3a2a4881f2336c4e156456899 100644 (file)
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
  *  @brief Some utility functions and classes.
  */
 
-#include "util.h"
-#include "exceptions.h"
-#include "dcp_content_type.h"
-#include "filter.h"
+
+#define UNICODE 1
+
+
+#include "audio_buffers.h"
+#include "audio_processor.h"
 #include "cinema_sound_processor.h"
+#include "compose.hpp"
 #include "config.h"
-#include "ratio.h"
-#include "job.h"
 #include "cross.h"
-#include "video_content.h"
-#include "rect.h"
+#include "crypto.h"
+#include "dcp_content_type.h"
 #include "digester.h"
-#include "audio_processor.h"
-#include "compose.hpp"
-#include "audio_buffers.h"
+#include "exceptions.h"
+#include "ffmpeg_image_proxy.h"
+#include "filter.h"
+#include "font.h"
+#include "image.h"
+#include "job.h"
+#include "job_manager.h"
+#include "ratio.h"
+#include "rect.h"
+#include "render_text.h"
+#include "string_text.h"
+#include "text_decoder.h"
+#include "util.h"
+#include "video_content.h"
+#include <dcp/atmos_asset.h>
+#include <dcp/decrypted_kdm.h>
 #include <dcp/locale_convert.h>
-#include <dcp/util.h>
-#include <dcp/raw_convert.h>
 #include <dcp/picture_asset.h>
+#include <dcp/raw_convert.h>
 #include <dcp/sound_asset.h>
 #include <dcp/subtitle_asset.h>
+#include <dcp/util.h>
+#include <dcp/warnings.h>
+LIBDCP_DISABLE_WARNINGS
 extern "C" {
 #include <libavfilter/avfilter.h>
 #include <libavformat/avformat.h>
 #include <libavcodec/avcodec.h>
 }
+LIBDCP_ENABLE_WARNINGS
 #include <curl/curl.h>
-#ifdef DCPOMATIC_GRAPHICS_MAGICK
-#include <Magick++.h>
-#endif
 #include <glib.h>
 #include <pangomm/init.h>
+#include <unicode/utypes.h>
+#include <unicode/unistr.h>
+#include <unicode/translit.h>
 #include <boost/algorithm/string.hpp>
 #include <boost/range/algorithm/replace_if.hpp>
 #include <boost/thread.hpp>
 #include <boost/filesystem.hpp>
+LIBDCP_DISABLE_WARNINGS
+#include <boost/locale.hpp>
+LIBDCP_ENABLE_WARNINGS
 #ifdef DCPOMATIC_WINDOWS
 #include <boost/locale.hpp>
 #include <dbghelp.h>
@@ -75,30 +95,33 @@ extern "C" {
 
 #include "i18n.h"
 
-using std::string;
-using std::setfill;
-using std::ostream;
+
+using std::bad_alloc;
+using std::cout;
 using std::endl;
-using std::vector;
-using std::min;
-using std::max;
-using std::map;
-using std::list;
-using std::multimap;
 using std::istream;
+using std::list;
+using std::make_pair;
+using std::make_shared;
+using std::map;
+using std::min;
+using std::ostream;
 using std::pair;
-using std::cout;
-using std::bad_alloc;
 using std::set_terminate;
-using std::make_pair;
-using boost::shared_ptr;
+using std::shared_ptr;
+using std::string;
+using std::vector;
+using std::wstring;
 using boost::thread;
 using boost::optional;
 using boost::lexical_cast;
 using boost::bad_lexical_cast;
+using boost::scoped_array;
 using dcp::Size;
 using dcp::raw_convert;
 using dcp::locale_convert;
+using namespace dcpomatic;
+
 
 /** Path to our executable, required by the stacktrace stuff and filled
  *  in during App::onInit().
@@ -219,6 +242,7 @@ addr2line (void const * const addr)
        return system(addr2line_cmd);
 }
 
+LIBDCP_DISABLE_WARNINGS
 /** This is called when C signals occur on Windows (e.g. SIGSEGV)
  *  (NOT C++ exceptions!).  We write a backtrace to backtrace_file by dark means.
  *  Adapted from code here: http://spin.atomicobject.com/2013/01/13/exceptions-stack-traces-c/
@@ -226,9 +250,11 @@ addr2line (void const * const addr)
 LONG WINAPI
 exception_handler(struct _EXCEPTION_POINTERS * info)
 {
-       FILE* f = fopen_boost (backtrace_file, "w");
-       fprintf (f, "C-style exception %d\n", info->ExceptionRecord->ExceptionCode);
-       fclose(f);
+       dcp::File f(backtrace_file, "w");
+       if (f) {
+               fprintf(f.get(), "C-style exception %d\n", info->ExceptionRecord->ExceptionCode);
+               f.close();
+       }
 
        if (info->ExceptionRecord->ExceptionCode != EXCEPTION_STACK_OVERFLOW) {
                CONTEXT* context = info->ContextRecord;
@@ -275,6 +301,7 @@ exception_handler(struct _EXCEPTION_POINTERS * info)
 
        return EXCEPTION_CONTINUE_SEARCH;
 }
+LIBDCP_ENABLE_WARNINGS
 #endif
 
 void
@@ -345,26 +372,50 @@ dcpomatic_setup ()
        SetUnhandledExceptionFilter(exception_handler);
 #endif
 
+#ifdef DCPOMATIC_HAVE_AVREGISTER
+LIBDCP_DISABLE_WARNINGS
        av_register_all ();
        avfilter_register_all ();
+LIBDCP_ENABLE_WARNINGS
+#endif
 
 #ifdef DCPOMATIC_OSX
        /* Add our library directory to the libltdl search path so that
           xmlsec can find xmlsec1-openssl.
        */
-       boost::filesystem::path lib = app_contents ();
+       auto lib = directory_containing_executable().parent_path();
        lib /= "Frameworks";
        setenv ("LTDL_LIBRARY_PATH", lib.c_str (), 1);
 #endif
 
        set_terminate (terminate);
 
+#ifdef DCPOMATIC_WINDOWS
+       putenv ("PANGOCAIRO_BACKEND=fontconfig");
+       putenv (String::compose("FONTCONFIG_PATH=%1", resources_path().string()).c_str());
+#endif
+
+#ifdef DCPOMATIC_OSX
+       setenv ("PANGOCAIRO_BACKEND", "fontconfig", 1);
+       setenv ("FONTCONFIG_PATH", resources_path().string().c_str(), 1);
+#endif
+
        Pango::init ();
-       dcp::init ();
+       dcp::init (libdcp_resources_path());
+
+#if defined(DCPOMATIC_WINDOWS) || defined(DCPOMATIC_OSX)
+       /* Render something to fontconfig to create its cache */
+       list<StringText> subs;
+       dcp::SubtitleString ss(
+               optional<string>(), false, false, false, dcp::Colour(), 42, 1, dcp::Time(), dcp::Time(), 0, dcp::HAlign::CENTER, 0, dcp::VAlign::CENTER, dcp::Direction::LTR,
+               "Hello dolly", dcp::Effect::NONE, dcp::Colour(), dcp::Time(), dcp::Time(), 0
+               );
+       subs.push_back (StringText(ss, 0));
+       render_text (subs, list<shared_ptr<Font>>(), dcp::Size(640, 480), DCPTime(), 24);
+#endif
 
        Ratio::setup_ratios ();
        PresetColourConversion::setup_colour_conversion_presets ();
-       VideoContentScale::setup_scales ();
        DCPContentType::setup_dcp_content_types ();
        Filter::setup_filters ();
        CinemaSoundProcessor::setup_cinema_sound_processors ();
@@ -372,10 +423,6 @@ dcpomatic_setup ()
 
        curl_global_init (CURL_GLOBAL_ALL);
 
-#ifdef DCPOMATIC_GRAPHICS_MAGICK
-       Magick::InitializeMagick (0);
-#endif
-
        ui_thread = boost::this_thread::get_id ();
 }
 
@@ -445,16 +492,15 @@ digest_head_tail (vector<boost::filesystem::path> files, boost::uintmax_t size)
        char* p = buffer.get ();
        int i = 0;
        while (i < int64_t (files.size()) && to_do > 0) {
-               FILE* f = fopen_boost (files[i], "rb");
+               dcp::File f(files[i], "rb");
                if (!f) {
-                       throw OpenFileError (files[i].string(), errno, true);
+                       throw OpenFileError (files[i].string(), errno, OpenFileError::READ);
                }
 
                boost::uintmax_t this_time = min (to_do, boost::filesystem::file_size (files[i]));
-               fread (p, 1, this_time, f);
+               f.checked_read(p, this_time);
                p += this_time;
                to_do -= this_time;
-               fclose (f);
 
                ++i;
        }
@@ -465,17 +511,16 @@ digest_head_tail (vector<boost::filesystem::path> files, boost::uintmax_t size)
        p = buffer.get ();
        i = files.size() - 1;
        while (i >= 0 && to_do > 0) {
-               FILE* f = fopen_boost (files[i], "rb");
+               dcp::File f(files[i], "rb");
                if (!f) {
-                       throw OpenFileError (files[i].string(), errno, true);
+                       throw OpenFileError (files[i].string(), errno, OpenFileError::READ);
                }
 
                boost::uintmax_t this_time = min (to_do, boost::filesystem::file_size (files[i]));
-               dcpomatic_fseek (f, -this_time, SEEK_END);
-               fread (p, 1, this_time, f);
+               f.seek(-this_time, SEEK_END);
+               f.checked_read(p, this_time);
                p += this_time;
                to_do -= this_time;
-               fclose (f);
 
                --i;
        }
@@ -484,19 +529,14 @@ digest_head_tail (vector<boost::filesystem::path> files, boost::uintmax_t size)
        return digester.get ();
 }
 
-/** Round a number up to the nearest multiple of another number.
- *  @param c Index.
- *  @param stride Array of numbers to round, indexed by c.
- *  @param t Multiple to round to.
- *  @return Rounded number.
- */
-int
-stride_round_up (int c, int const * stride, int t)
+
+string
+simple_digest (vector<boost::filesystem::path> paths)
 {
-       int const a = stride[c] + (t - 1);
-       return a - (a % t);
+       return digest_head_tail(paths, 1000000) + raw_convert<string>(boost::filesystem::file_size(paths.front()));
 }
 
+
 /** Trip an assert if the caller is not in the UI thread */
 void
 ensure_ui_thread ()
@@ -557,7 +597,7 @@ short_audio_channel_name (int c)
                _("BsR"),
                _("DBP"),
                _("DBS"),
-               "",
+               _("Sign"),
                ""
        };
 
@@ -572,13 +612,13 @@ valid_image_file (boost::filesystem::path f)
                return false;
        }
 
-       string ext = f.extension().string();
+       auto ext = f.extension().string();
        transform (ext.begin(), ext.end(), ext.begin(), ::tolower);
        return (
                ext == ".tif" || ext == ".tiff" || ext == ".jpg" || ext == ".jpeg" ||
                ext == ".png" || ext == ".bmp" || ext == ".tga" || ext == ".dpx" ||
                ext == ".j2c" || ext == ".j2k" || ext == ".jp2" || ext == ".exr" ||
-               ext == ".jpf"
+               ext == ".jpf" || ext == ".psd"
                );
 }
 
@@ -589,7 +629,7 @@ valid_sound_file (boost::filesystem::path f)
                return false;
        }
 
-       string ext = f.extension().string();
+       auto ext = f.extension().string();
        transform (ext.begin(), ext.end(), ext.begin(), ::tolower);
        return (ext == ".wav" || ext == ".mp3" || ext == ".aif" || ext == ".aiff");
 }
@@ -597,7 +637,7 @@ valid_sound_file (boost::filesystem::path f)
 bool
 valid_j2k_file (boost::filesystem::path f)
 {
-       string ext = f.extension().string();
+       auto ext = f.extension().string();
        transform (ext.begin(), ext.end(), ext.begin(), ::tolower);
        return (ext == ".j2k" || ext == ".j2c" || ext == ".jp2");
 }
@@ -619,16 +659,6 @@ fit_ratio_within (float ratio, dcp::Size full_frame)
        return dcp::Size (full_frame.width, lrintf (full_frame.width / ratio));
 }
 
-void *
-wrapped_av_malloc (size_t s)
-{
-       void* p = av_malloc (s);
-       if (!p) {
-               throw bad_alloc ();
-       }
-       return p;
-}
-
 map<string, string>
 split_get_request (string url)
 {
@@ -701,13 +731,28 @@ audio_asset_filename (shared_ptr<dcp::SoundAsset> asset, int reel_index, int ree
        return Config::instance()->dcp_asset_filename_format().get(values, "_" + asset->id() + ".mxf");
 }
 
+
+string
+atmos_asset_filename (shared_ptr<dcp::AtmosAsset> asset, int reel_index, int reel_count, optional<string> summary)
+{
+       dcp::NameFormat::Map values;
+       values['t'] = "atmos";
+       values['r'] = raw_convert<string> (reel_index + 1);
+       values['n'] = raw_convert<string> (reel_count);
+       if (summary) {
+               values['c'] = careful_string_filter (summary.get());
+       }
+       return Config::instance()->dcp_asset_filename_format().get(values, "_" + asset->id() + ".mxf");
+}
+
+
 float
 relaxed_string_to_float (string s)
 {
        try {
                boost::algorithm::replace_all (s, ",", ".");
                return lexical_cast<float> (s);
-       } catch (bad_lexical_cast) {
+       } catch (bad_lexical_cast &) {
                boost::algorithm::replace_all (s, ".", ",");
                return lexical_cast<float> (s);
        }
@@ -721,20 +766,44 @@ careful_string_filter (string s)
           Safety first and all that.
        */
 
-       string out;
-       string const allowed = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_%.+";
-       for (size_t i = 0; i < s.size(); ++i) {
-               if (allowed.find (s[i]) != string::npos) {
-                       out += s[i];
+       /* First transliterate using libicu to try to remove accents in a "nice" way */
+       auto transliterated = icu::UnicodeString::fromUTF8(icu::StringPiece(s));
+       auto status = U_ZERO_ERROR;
+       auto transliterator = icu::Transliterator::createInstance("NFD; [:M:] Remove; NFC", UTRANS_FORWARD, status);
+       transliterator->transliterate(transliterated);
+
+       /* Some things are missed by ICU's transliterator */
+       std::map<wchar_t, wchar_t> replacements = {
+               { L'ł',         L'l' },
+               { L'Ł',         L'L' }
+       };
+
+       icu::UnicodeString transliterated_more;
+       for (int i = 0; i < transliterated.length(); ++i) {
+               auto replacement = replacements.find(transliterated[i]);
+               if (replacement != replacements.end()) {
+                       transliterated_more += replacement->second;
+               } else {
+                       transliterated_more += transliterated[i];
+               }
+       }
+
+       /* Then remove anything that's not in a very limited character set */
+       wstring out;
+       wstring const allowed = L"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_%.+";
+       for (size_t i = 0; i < transliterated_more.length(); ++i) {
+               wchar_t c = transliterated_more[i];
+               if (allowed.find(c) != string::npos) {
+                       out += c;
                }
        }
 
-       return out;
+       return boost::locale::conv::utf_to_utf<char>(out);
 }
 
 /** @param mapped List of mapped audio channels from a Film.
  *  @param channels Total number of channels in the Film.
- *  @return First: number of non-LFE channels, second: number of LFE channels.
+ *  @return First: number of non-LFE soundtrack channels (L/R/C/Ls/Rs/Lc/Rc/Bsl/Bsr), second: number of LFE channels.
  */
 pair<int, int>
 audio_channel_types (list<int> mapped, int channels)
@@ -742,16 +811,32 @@ audio_channel_types (list<int> mapped, int channels)
        int non_lfe = 0;
        int lfe = 0;
 
-       BOOST_FOREACH (int i, mapped) {
+       for (auto i: mapped) {
                if (i >= channels) {
                        /* This channel is mapped but is not included in the DCP */
                        continue;
                }
 
-               if (static_cast<dcp::Channel> (i) == dcp::LFE) {
+               switch (static_cast<dcp::Channel>(i)) {
+               case dcp::Channel::LFE:
                        ++lfe;
-               } else {
+                       break;
+               case dcp::Channel::LEFT:
+               case dcp::Channel::RIGHT:
+               case dcp::Channel::CENTRE:
+               case dcp::Channel::LS:
+               case dcp::Channel::RS:
+               case dcp::Channel::BSL:
+               case dcp::Channel::BSR:
                        ++non_lfe;
+                       break;
+               case dcp::Channel::HI:
+               case dcp::Channel::VI:
+               case dcp::Channel::MOTION_DATA:
+               case dcp::Channel::SYNC_SIGNAL:
+               case dcp::Channel::SIGN_LANGUAGE:
+               case dcp::Channel::CHANNEL_COUNT:
+                       break;
                }
        }
 
@@ -761,17 +846,19 @@ audio_channel_types (list<int> mapped, int channels)
 shared_ptr<AudioBuffers>
 remap (shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping map)
 {
-       shared_ptr<AudioBuffers> mapped (new AudioBuffers (output_channels, input->frames()));
+       auto mapped = make_shared<AudioBuffers>(output_channels, input->frames());
        mapped->make_silent ();
 
-       for (int i = 0; i < map.input_channels(); ++i) {
+       int to_do = min (map.input_channels(), input->channels());
+
+       for (int i = 0; i < to_do; ++i) {
                for (int j = 0; j < mapped->channels(); ++j) {
-                       if (map.get (i, static_cast<dcp::Channel> (j)) > 0) {
-                               mapped->accumulate_channel (
+                       if (map.get(i, j) > 0) {
+                               mapped->accumulate_channel(
                                        input.get(),
                                        i,
-                                       static_cast<dcp::Channel> (j),
-                                       map.get (i, static_cast<dcp::Channel> (j))
+                                       j,
+                                       map.get(i, j)
                                        );
                        }
                }
@@ -783,9 +870,278 @@ remap (shared_ptr<const AudioBuffers> input, int output_channels, AudioMapping m
 Eyes
 increment_eyes (Eyes e)
 {
-       if (e == EYES_LEFT) {
-               return EYES_RIGHT;
+       if (e == Eyes::LEFT) {
+               return Eyes::RIGHT;
+       }
+
+       return Eyes::LEFT;
+}
+
+
+size_t
+utf8_strlen (string s)
+{
+       size_t const len = s.length ();
+       int N = 0;
+       for (size_t i = 0; i < len; ++i) {
+               unsigned char c = s[i];
+               if ((c & 0xe0) == 0xc0) {
+                       ++i;
+               } else if ((c & 0xf0) == 0xe0) {
+                       i += 2;
+               } else if ((c & 0xf8) == 0xf0) {
+                       i += 3;
+               }
+               ++N;
+       }
+       return N;
+}
+
+string
+day_of_week_to_string (boost::gregorian::greg_weekday d)
+{
+       switch (d.as_enum()) {
+       case boost::date_time::Sunday:
+               return _("Sunday");
+       case boost::date_time::Monday:
+               return _("Monday");
+       case boost::date_time::Tuesday:
+               return _("Tuesday");
+       case boost::date_time::Wednesday:
+               return _("Wednesday");
+       case boost::date_time::Thursday:
+               return _("Thursday");
+       case boost::date_time::Friday:
+               return _("Friday");
+       case boost::date_time::Saturday:
+               return _("Saturday");
+       }
+
+       return d.as_long_string ();
+}
+
+/** @param size Size of picture that the subtitle will be overlaid onto */
+void
+emit_subtitle_image (ContentTimePeriod period, dcp::SubtitleImage sub, dcp::Size size, shared_ptr<TextDecoder> decoder)
+{
+       /* XXX: this is rather inefficient; decoding the image just to get its size */
+       FFmpegImageProxy proxy (sub.png_image());
+       auto image = proxy.image(Image::Alignment::PADDED).image;
+       /* set up rect with height and width */
+       dcpomatic::Rect<double> rect(0, 0, image->size().width / double(size.width), image->size().height / double(size.height));
+
+       /* add in position */
+
+       switch (sub.h_align()) {
+       case dcp::HAlign::LEFT:
+               rect.x += sub.h_position();
+               break;
+       case dcp::HAlign::CENTER:
+               rect.x += 0.5 + sub.h_position() - rect.width / 2;
+               break;
+       case dcp::HAlign::RIGHT:
+               rect.x += 1 - sub.h_position() - rect.width;
+               break;
+       }
+
+       switch (sub.v_align()) {
+       case dcp::VAlign::TOP:
+               rect.y += sub.v_position();
+               break;
+       case dcp::VAlign::CENTER:
+               rect.y += 0.5 + sub.v_position() - rect.height / 2;
+               break;
+       case dcp::VAlign::BOTTOM:
+               rect.y += 1 - sub.v_position() - rect.height;
+               break;
+       }
+
+       decoder->emit_bitmap (period, image, rect);
+}
+
+bool
+show_jobs_on_console (bool progress)
+{
+       bool first = true;
+       bool error = false;
+       while (true) {
+
+               dcpomatic_sleep_seconds (5);
+
+               auto jobs = JobManager::instance()->get();
+
+               if (!first && progress) {
+                       for (size_t i = 0; i < jobs.size(); ++i) {
+                               cout << "\033[1A\033[2K";
+                       }
+                       cout.flush ();
+               }
+
+               first = false;
+
+               for (auto i: jobs) {
+                       if (progress) {
+                               cout << i->name();
+                               if (!i->sub_name().empty()) {
+                                       cout << "; " << i->sub_name();
+                               }
+                               cout << ": ";
+
+                               if (i->progress ()) {
+                                       cout << i->status() << "                            \n";
+                               } else {
+                                       cout << ": Running           \n";
+                               }
+                       }
+
+                       if (!progress && i->finished_in_error()) {
+                               /* We won't see this error if we haven't been showing progress,
+                                  so show it now.
+                               */
+                               cout << i->status() << "\n";
+                       }
+
+                       if (i->finished_in_error()) {
+                               error = true;
+                       }
+               }
+
+               if (!JobManager::instance()->work_to_do()) {
+                       break;
+               }
+       }
+
+       return error;
+}
+
+/** XXX: could use mmap? */
+void
+copy_in_bits (boost::filesystem::path from, boost::filesystem::path to, std::function<void (float)> progress)
+{
+       dcp::File f(from, "rb");
+       if (!f) {
+               throw OpenFileError (from, errno, OpenFileError::READ);
+       }
+       dcp::File t(to, "wb");
+       if (!t) {
+               throw OpenFileError (to, errno, OpenFileError::WRITE);
+       }
+
+       /* on the order of a second's worth of copying */
+       boost::uintmax_t const chunk = 20 * 1024 * 1024;
+
+       std::vector<uint8_t> buffer(chunk);
+
+       boost::uintmax_t const total = boost::filesystem::file_size (from);
+       boost::uintmax_t remaining = total;
+
+       while (remaining) {
+               boost::uintmax_t this_time = min (chunk, remaining);
+               size_t N = f.read(buffer.data(), 1, chunk);
+               if (N < this_time) {
+                       throw ReadFileError (from, errno);
+               }
+
+               N = t.write(buffer.data(), 1, this_time);
+               if (N < this_time) {
+                       throw WriteFileError (to, errno);
+               }
+
+               progress (1 - float(remaining) / total);
+               remaining -= this_time;
+       }
+}
+
+
+dcp::Size
+scale_for_display (dcp::Size s, dcp::Size display_container, dcp::Size film_container, PixelQuanta quanta)
+{
+       /* Now scale it down if the display container is smaller than the film container */
+       if (display_container != film_container) {
+               float const scale = min (
+                       float (display_container.width) / film_container.width,
+                       float (display_container.height) / film_container.height
+                       );
+
+               s.width = lrintf (s.width * scale);
+               s.height = lrintf (s.height * scale);
+               s = quanta.round (s);
        }
 
-       return EYES_LEFT;
+       return s;
+}
+
+
+dcp::DecryptedKDM
+decrypt_kdm_with_helpful_error (dcp::EncryptedKDM kdm)
+{
+       try {
+               return dcp::DecryptedKDM (kdm, Config::instance()->decryption_chain()->key().get());
+       } catch (dcp::KDMDecryptionError& e) {
+               /* Try to flesh out the error a bit */
+               auto const kdm_subject_name = kdm.recipient_x509_subject_name();
+               bool on_chain = false;
+               auto dc = Config::instance()->decryption_chain();
+               for (auto i: dc->root_to_leaf()) {
+                       if (i.subject() == kdm_subject_name) {
+                               on_chain = true;
+                       }
+               }
+               if (!on_chain) {
+                       throw KDMError (_("This KDM was not made for DCP-o-matic's decryption certificate."), e.what());
+               } else if (kdm_subject_name != dc->leaf().subject()) {
+                       throw KDMError (_("This KDM was made for DCP-o-matic but not for its leaf certificate."), e.what());
+               } else {
+                       throw;
+               }
+       }
 }
+
+
+boost::filesystem::path
+default_font_file ()
+{
+       boost::filesystem::path liberation_normal;
+       try {
+               liberation_normal = resources_path() / "LiberationSans-Regular.ttf";
+               if (!boost::filesystem::exists (liberation_normal)) {
+                       /* Hack for unit tests */
+                       liberation_normal = resources_path() / "fonts" / "LiberationSans-Regular.ttf";
+               }
+       } catch (boost::filesystem::filesystem_error& e) {
+
+       }
+
+       if (!boost::filesystem::exists(liberation_normal)) {
+               liberation_normal = "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf";
+       }
+
+       return liberation_normal;
+}
+
+
+string
+to_upper (string s)
+{
+       transform (s.begin(), s.end(), s.begin(), ::toupper);
+       return s;
+}
+
+
+/* Set to 1 to print the IDs of some of our threads to stdout on creation */
+#define DCPOMATIC_DEBUG_THREADS 0
+
+#if DCPOMATIC_DEBUG_THREADS
+void
+start_of_thread (string name)
+{
+       std::cout << "THREAD:" << name << ":" << std::hex << pthread_self() << "\n";
+}
+#else
+void
+start_of_thread (string)
+{
+
+}
+#endif
+