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-rw-r--r--gfx/ots/src/name.cc369
1 files changed, 369 insertions, 0 deletions
diff --git a/gfx/ots/src/name.cc b/gfx/ots/src/name.cc
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+++ b/gfx/ots/src/name.cc
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+// 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
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