Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 369 insertions, 0 deletions

diff --git a/gfx/ots/src/name.cc b/gfx/ots/src/name.cc
new file mode 100644
index 0000000000..fc5074b058
--- /dev/null
+++ b/gfx/ots/src/name.cc
@@ -0,0 +1,369 @@
+// Copyright (c) 2011-2017 The OTS 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 <cctype>
+
+// name - Naming Table
+// http://www.microsoft.com/typography/otspec/name.htm
+
+namespace {
+
+// We disallow characters outside the URI spec "unreserved characters"
+// set; any chars outside this set will be replaced by underscore.
+bool AllowedInPsName(char c) {
+  return isalnum(c) || std::strchr("-._~", c);
+}
+
+bool SanitizePsNameAscii(std::string& name) {
+  if (name.size() > 63)
+    return false;
+
+  for (unsigned i = 0; i < name.size(); ++i) {
+    if (!AllowedInPsName(name[i])) {
+      name[i] = '_';
+    }
+  }
+  return true;
+}
+
+bool SanitizePsNameUtf16Be(std::string& name) {
+  if ((name.size() & 1) != 0)
+    return false;
+  if (name.size() > 2 * 63)
+    return false;
+
+  for (unsigned i = 0; i < name.size(); i += 2) {
+    if (name[i] != 0) {
+      // non-Latin1 char in psname? reject it altogether
+      return false;
+    }
+    if (!AllowedInPsName(name[i+1])) {
+      name[i] = '_';
+    }
+  }
+  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 OpenTypeNAME::Parse(const uint8_t* data, size_t length) {
+  Buffer table(data, length);
+
+  uint16_t format = 0;
+  if (!table.ReadU16(&format) || format > 1) {
+    return Error("Failed to read table format or bad format %d", format);
+  }
+
+  uint16_t count = 0;
+  if (!table.ReadU16(&count)) {
+    return Error("Failed to read name count");
+  }
+
+  uint16_t string_offset = 0;
+  if (!table.ReadU16(&string_offset) || string_offset > length) {
+    return Error("Failed to read or bad stringOffset");
+  }
+  const char* string_base = reinterpret_cast<const char*>(data) +
+      string_offset;
+
+  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 = 0;
+    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 Error("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: "sanitize" it by replacing any chars outside the
+      // URI spec "unreserved" set by underscore, or reject the name entirely
+      // (and use a fallback) if it looks really broken.
+      if (rec.platform_id == 1) {
+        if (!SanitizePsNameAscii(rec.text)) {
+          continue;
+        }
+      } else if (rec.platform_id == 0 || rec.platform_id == 3) {
+        if (!SanitizePsNameUtf16Be(rec.text)) {
+          continue;
+        }
+      }
+    }
+
+    if (!this->names.empty() && !(this->names.back() < rec)) {
+      Warning("name records are not sorted.");
+      sort_required = true;
+    }
+
+    this->names.push_back(rec);
+    this->name_ids.insert(rec.name_id);
+  }
+
+  if (format == 1) {
+    // extended name table format with language tags
+    uint16_t lang_tag_count;
+    if (!table.ReadU16(&lang_tag_count)) {
+      return Error("Failed to read langTagCount");
+    }
+    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 Error("Faile to read length or offset for langTagRecord %d", i);
+      }
+      const unsigned tag_end = static_cast<unsigned>(string_offset) +
+          tag_offset + tag_length;
+      if (tag_end > length) {
+        return Error("bad end of tag %d > %ld for langTagRecord %d", tag_end, length, i);
+      }
+      // Lang tag is BCP 47 tag per the spec, the recommonded BCP 47 max tag
+      // length is 35:
+      // https://tools.ietf.org/html/bcp47#section-4.4.1
+      // We are being too generous and allowing for 100 (multiplied by 2 since
+      // this is UTF-16 string).
+      if (tag_length > 100 * 2) {
+        return Error("Too long language tag for LangTagRecord %d: %d", i, tag_length);
+      }
+      std::string tag(string_base + tag_offset, tag_length);
+      this->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 Error("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 uint16_t kStdNameCount = 7;
+  static const char* kStdNames[kStdNameCount] = {
+    NULL,
+    "OTS derived font",
+    "Unspecified",
+    NULL,
+    "OTS derived font",
+    "1.000",
+    "OTS-derived-font"
+  };
+
+  // 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 (const auto& name : this->names) {
+    const uint16_t id = name.name_id;
+    if (id >= kStdNameCount || kStdNames[id] == NULL) {
+      continue;
+    }
+    if (name.platform_id == 1) {
+      mac_name[id] = true;
+      continue;
+    }
+    if (name.platform_id == 3) {
+      win_name[id] = true;
+      continue;
+    }
+  }
+
+  for (uint16_t i = 0; i < kStdNameCount; ++i) {
+    if (kStdNames[i] == NULL) {
+      continue;
+    }
+    if (!mac_name[i] && !win_name[i]) {
+      NameRecord mac_rec(1 /* platform_id */, 0 /* encoding_id */,
+                         0 /* language_id */ , i /* name_id */);
+      mac_rec.text.assign(kStdNames[i]);
+
+      NameRecord win_rec(3 /* platform_id */, 1 /* encoding_id */,
+                         1033 /* language_id */ , i /* name_id */);
+      AssignToUtf16BeFromAscii(&win_rec.text, std::string(kStdNames[i]));
+
+      this->names.push_back(mac_rec);
+      this->names.push_back(win_rec);
+      sort_required = true;
+    }
+  }
+
+  if (sort_required) {
+    std::sort(this->names.begin(), this->names.end());
+  }
+
+  return true;
+}
+
+bool OpenTypeNAME::Serialize(OTSStream* out) {
+  uint16_t name_count = static_cast<uint16_t>(this->names.size());
+  uint16_t lang_tag_count = static_cast<uint16_t>(this->lang_tags.size());
+  uint16_t format = 0;
+  size_t string_offset = 6 + name_count * 12;
+
+  if (this->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 Error("Bad stringOffset: %ld", string_offset);
+  }
+  if (!out->WriteU16(format) ||
+      !out->WriteU16(name_count) ||
+      !out->WriteU16(static_cast<uint16_t>(string_offset))) {
+    return Error("Failed to write name header");
+  }
+
+  std::string string_data;
+  for (const auto& rec : this->names) {
+    if (string_data.size() + rec.text.size() >
+            std::numeric_limits<uint16_t>::max() ||
+        !out->WriteU16(rec.platform_id) ||
+        !out->WriteU16(rec.encoding_id) ||
+        !out->WriteU16(rec.language_id) ||
+        !out->WriteU16(rec.name_id) ||
+        !out->WriteU16(static_cast<uint16_t>(rec.text.size())) ||
+        !out->WriteU16(static_cast<uint16_t>(string_data.size())) ) {
+      return Error("Faile to write nameRecord");
+    }
+    string_data.append(rec.text);
+  }
+
+  if (format == 1) {
+    if (!out->WriteU16(lang_tag_count)) {
+      return Error("Faile to write langTagCount");
+    }
+    for (const auto& tag : this->lang_tags) {
+      if (string_data.size() + tag.size() >
+              std::numeric_limits<uint16_t>::max() ||
+          !out->WriteU16(static_cast<uint16_t>(tag.size())) ||
+          !out->WriteU16(static_cast<uint16_t>(string_data.size()))) {
+        return Error("Failed to write langTagRecord");
+      }
+      string_data.append(tag);
+    }
+  }
+
+  if (!out->Write(string_data.data(), string_data.size())) {
+    return Error("Faile to write string data");
+  }
+
+  return true;
+}
+
+bool OpenTypeNAME::IsValidNameId(uint16_t nameID, bool addIfMissing) {
+  if (addIfMissing && !this->name_ids.count(nameID)) {
+    bool added_unicode = false;
+    bool added_macintosh = false;
+    bool added_windows = false;
+    const size_t names_size = this->names.size();  // original size
+    for (size_t i = 0; i < names_size; ++i) switch (names[i].platform_id) {
+     case 0:
+      if (!added_unicode) {
+        // If there is an existing NameRecord with platform_id == 0 (Unicode),
+        // then add a NameRecord for the the specified nameID with arguments
+        // 0 (Unicode), 0 (v1.0), 0 (unspecified language).
+        this->names.emplace_back(0, 0, 0, nameID);
+        this->names.back().text = "NoName";
+        added_unicode = true;
+      }
+      break;
+     case 1:
+      if (!added_macintosh) {
+        // If there is an existing NameRecord with platform_id == 1 (Macintosh),
+        // then add a NameRecord for the specified nameID with arguments
+        // 1 (Macintosh), 0 (Roman), 0 (English).
+        this->names.emplace_back(1, 0, 0, nameID);
+        this->names.back().text = "NoName";
+        added_macintosh = true;
+      }
+      break;
+     case 3:
+      if (!added_windows) {
+        // If there is an existing NameRecord with platform_id == 3 (Windows),
+        // then add a NameRecord for the specified nameID with arguments
+        // 3 (Windows), 1 (UCS), 1033 (US English).
+        this->names.emplace_back(3, 1, 1033, nameID);
+        this->names.back().text = "NoName";
+        added_windows = true;
+      }
+      break;
+    }
+    if (added_unicode || added_macintosh || added_windows) {
+      std::sort(this->names.begin(), this->names.end());
+      this->name_ids.insert(nameID);
+    }
+  }
+  return this->name_ids.count(nameID);
+}
+
+}  // namespace