The Tor Browser: gfx/ots/src/name.cc@6474c204b198 (annotated)

gfx/ots/src/name.cc@6474c204b198 (annotated)

gfx/ots/src/name.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "name.h"
 #include <algorithm>
 #include <cstring>
 #include "cff.h"
 // name - Naming Table
 // http://www.microsoft.com/typography/otspec/name.htm
 #define TABLE_NAME "name"
 namespace {
 bool ValidInPsName(char c) {
   return (c > 0x20 && c < 0x7f && !std::strchr("[](){}<>/%", c));
 }
 bool CheckPsNameAscii(const std::string& name) {
   for (unsigned i = 0; i < name.size(); ++i) {
     if (!ValidInPsName(name[i])) {
       return false;
     }
   }
   return true;
 }
 bool CheckPsNameUtf16Be(const std::string& name) {
   if ((name.size() & 1) != 0)
     return false;
   for (unsigned i = 0; i < name.size(); i += 2) {
     if (name[i] != 0) {
       return false;
     }
     if (!ValidInPsName(name[i+1])) {
       return false;
     }
   }
   return true;
 }
 void AssignToUtf16BeFromAscii(std::string* target,
                               const std::string& source) {
   target->resize(source.size() * 2);
   for (unsigned i = 0, j = 0; i < source.size(); i++) {
     (*target)[j++] = '\0';
     (*target)[j++] = source[i];
   }
 }
 }  // namespace
 namespace ots {
 bool ots_name_parse(OpenTypeFile* file, const uint8_t* data, size_t length) {
   Buffer table(data, length);
   OpenTypeNAME* name = new OpenTypeNAME;
   file->name = name;
   uint16_t format = 0;
   if (!table.ReadU16(&format) || format > 1) {
     return OTS_FAILURE_MSG("Failed to read name table format or bad format %d", format);
   }
   uint16_t count = 0;
   if (!table.ReadU16(&count)) {
     return OTS_FAILURE_MSG("Failed to read name count");
   }
   uint16_t string_offset = 0;
   if (!table.ReadU16(&string_offset) || string_offset > length) {
     return OTS_FAILURE_MSG("Failed to read strings offset");
   }
   const char* string_base = reinterpret_cast<const char*>(data) +
       string_offset;
   NameRecord prev_record;
   bool sort_required = false;
   // Read all the names, discarding any with invalid IDs,
   // and any where the offset/length would be outside the table.
   // A stricter alternative would be to reject the font if there
   // are invalid name records, but it's not clear that is necessary.
   for (unsigned i = 0; i < count; ++i) {
     NameRecord rec;
     uint16_t name_length, name_offset;
     if (!table.ReadU16(&rec.platform_id) ||
         !table.ReadU16(&rec.encoding_id) ||
         !table.ReadU16(&rec.language_id) ||
         !table.ReadU16(&rec.name_id) ||
         !table.ReadU16(&name_length) ||
         !table.ReadU16(&name_offset)) {
       return OTS_FAILURE_MSG("Failed to read name entry %d", i);
     }
     // check platform & encoding, discard names with unknown values
     switch (rec.platform_id) {
       case 0:  // Unicode
         if (rec.encoding_id > 6) {
           continue;
         }
         break;
       case 1:  // Macintosh
         if (rec.encoding_id > 32) {
           continue;
         }
         break;
       case 2:  // ISO
         if (rec.encoding_id > 2) {
           continue;
         }
         break;
       case 3:  // Windows: IDs 7 to 9 are "reserved"
         if (rec.encoding_id > 6 && rec.encoding_id != 10) {
           continue;
         }
         break;
       case 4:  // Custom (OTF Windows NT compatibility)
         if (rec.encoding_id > 255) {
           continue;
         }
         break;
       default:  // unknown platform
         continue;
     }
     const unsigned name_end = static_cast<unsigned>(string_offset) +
         name_offset + name_length;
     if (name_end > length) {
       continue;
     }
     rec.text.resize(name_length);
     rec.text.assign(string_base + name_offset, name_length);
     if (rec.name_id == 6) {
       // PostScript name: check that it is valid, if not then discard it
       if (rec.platform_id == 1) {
         if (file->cff && !file->cff->name.empty()) {
           rec.text = file->cff->name;
         } else if (!CheckPsNameAscii(rec.text)) {
           continue;
         }
       } else if (rec.platform_id == 0 || rec.platform_id == 3) {
         if (file->cff && !file->cff->name.empty()) {
           AssignToUtf16BeFromAscii(&rec.text, file->cff->name);
         } else if (!CheckPsNameUtf16Be(rec.text)) {
           continue;
         }
       }
     }
     if ((i > 0) && !(prev_record < rec)) {
       OTS_WARNING("name records are not sorted.");
       sort_required = true;
     }
     name->names.push_back(rec);
     prev_record = rec;
   }
   if (format == 1) {
     // extended name table format with language tags
     uint16_t lang_tag_count;
     if (!table.ReadU16(&lang_tag_count)) {
       return OTS_FAILURE_MSG("Failed to read language tag count");
     }
     for (unsigned i = 0; i < lang_tag_count; ++i) {
       uint16_t tag_length = 0;
       uint16_t tag_offset = 0;
       if (!table.ReadU16(&tag_length) || !table.ReadU16(&tag_offset)) {
         return OTS_FAILURE_MSG("Faile to read tag length or offset");
       }
       const unsigned tag_end = static_cast<unsigned>(string_offset) +
           tag_offset + tag_length;
       if (tag_end > length) {
         return OTS_FAILURE_MSG("bad end of tag %d > %ld for name entry %d", tag_end, length, i);
       }
       std::string tag(string_base + tag_offset, tag_length);
       name->lang_tags.push_back(tag);
     }
   }
   if (table.offset() > string_offset) {
     // the string storage apparently overlapped the name/tag records;
     // consider this font to be badly broken
     return OTS_FAILURE_MSG("Bad table offset %ld > %d", table.offset(), string_offset);
   }
   // check existence of required name strings (synthesize if necessary)
   //  [0 - copyright - skip]
   //   1 - family
   //   2 - subfamily
   //  [3 - unique ID - skip]
   //   4 - full name
   //   5 - version
   //   6 - postscript name
   static const unsigned kStdNameCount = 7;
   static const char* kStdNames[kStdNameCount] = {
     NULL,
     "OTS derived font",
     "Unspecified",
     NULL,
     "OTS derived font",
     "1.000",
     "OTS-derived-font"
   };
   // The spec says that "In CFF OpenType fonts, these two name strings, when
   // translated to ASCII, must also be identical to the font name as stored in
   // the CFF's Name INDEX." And actually, Mac OS X's font parser requires that.
   if (file->cff && !file->cff->name.empty()) {
     kStdNames[6] = file->cff->name.c_str();
   }
   // scan the names to check whether the required "standard" ones are present;
   // if not, we'll add our fixed versions here
   bool mac_name[kStdNameCount] = { 0 };
   bool win_name[kStdNameCount] = { 0 };
   for (std::vector<NameRecord>::iterator name_iter = name->names.begin();
        name_iter != name->names.end(); name_iter++) {
     const uint16_t id = name_iter->name_id;
     if (id >= kStdNameCount || kStdNames[id] == NULL) {
       continue;
     }
     if (name_iter->platform_id == 1) {
       mac_name[id] = true;
       continue;
     }
     if (name_iter->platform_id == 3) {
       win_name[id] = true;
       continue;
     }
   }
   for (unsigned i = 0; i < kStdNameCount; ++i) {
     if (kStdNames[i] == NULL) {
       continue;
     }
     if (!mac_name[i]) {
       NameRecord rec(1 /* platform_id */, 0 /* encoding_id */,
 /* language_id */ , i /* name_id */);
       rec.text.assign(kStdNames[i]);
       name->names.push_back(rec);
       sort_required = true;
     }
     if (!win_name[i]) {
       NameRecord rec(3 /* platform_id */, 1 /* encoding_id */,
 /* language_id */ , i /* name_id */);
       AssignToUtf16BeFromAscii(&rec.text, std::string(kStdNames[i]));
       name->names.push_back(rec);
       sort_required = true;
     }
   }
   if (sort_required) {
     std::sort(name->names.begin(), name->names.end());
   }
   return true;
 }
 bool ots_name_should_serialise(OpenTypeFile* file) {
   return file->name != NULL;
 }
 bool ots_name_serialise(OTSStream* out, OpenTypeFile* file) {
   const OpenTypeNAME* name = file->name;
   uint16_t name_count = name->names.size();
   uint16_t lang_tag_count = name->lang_tags.size();
   uint16_t format = 0;
   size_t string_offset = 6 + name_count * 12;
   if (name->lang_tags.size() > 0) {
     // lang tags require a format-1 name table
     format = 1;
     string_offset += 2 + lang_tag_count * 4;
   }
   if (string_offset > 0xffff) {
     return OTS_FAILURE_MSG("Bad string offset %ld", string_offset);
   }
   if (!out->WriteU16(format) ||
       !out->WriteU16(name_count) ||
       !out->WriteU16(string_offset)) {
     return OTS_FAILURE_MSG("Failed to write name header");
   }
   std::string string_data;
   for (std::vector<NameRecord>::const_iterator name_iter = name->names.begin();
        name_iter != name->names.end(); name_iter++) {
     const NameRecord& rec = *name_iter;
     if (!out->WriteU16(rec.platform_id) ||
         !out->WriteU16(rec.encoding_id) ||
         !out->WriteU16(rec.language_id) ||
         !out->WriteU16(rec.name_id) ||
         !out->WriteU16(rec.text.size()) ||
         !out->WriteU16(string_data.size()) ) {
       return OTS_FAILURE_MSG("Faile to write name entry");
     }
     string_data.append(rec.text);
   }
   if (format == 1) {
     if (!out->WriteU16(lang_tag_count)) {
       return OTS_FAILURE_MSG("Faile to write language tag count");
     }
     for (std::vector<std::string>::const_iterator tag_iter =
              name->lang_tags.begin();
          tag_iter != name->lang_tags.end(); tag_iter++) {
       if (!out->WriteU16(tag_iter->size()) ||
           !out->WriteU16(string_data.size())) {
         return OTS_FAILURE_MSG("Failed to write string");
       }
       string_data.append(*tag_iter);
     }
   }
   if (!out->Write(string_data.data(), string_data.size())) {
     return OTS_FAILURE_MSG("Faile to write string data");
   }
   return true;
 }
 void ots_name_free(OpenTypeFile* file) {
   delete file->name;
 }
 }  // namespace

The Tor Browser / annotate

gfx/ots/src/name.cc@6474c204b198 (annotated)

gfx/ots/src/name.cc