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-rw-r--r--gfx/ots/src/feat.cc190
1 files changed, 190 insertions, 0 deletions
diff --git a/gfx/ots/src/feat.cc b/gfx/ots/src/feat.cc
new file mode 100644
index 0000000000..19f22c3bc5
--- /dev/null
+++ b/gfx/ots/src/feat.cc
@@ -0,0 +1,190 @@
+// Copyright (c) 2009-2017 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 "feat.h"
+
+#include "name.h"
+
+namespace ots {
+
+bool OpenTypeFEAT::Parse(const uint8_t* data, size_t length) {
+ Buffer table(data, length);
+
+ if (!table.ReadU32(&this->version)) {
+ return DropGraphite("Failed to read version");
+ }
+ if (this->version >> 16 != 1 && this->version >> 16 != 2) {
+ return DropGraphite("Unsupported table version: %u", this->version >> 16);
+ }
+ if (!table.ReadU16(&this->numFeat)) {
+ return DropGraphite("Failed to read numFeat");
+ }
+ if (!table.ReadU16(&this->reserved)) {
+ return DropGraphite("Failed to read reserved");
+ }
+ if (this->reserved != 0) {
+ Warning("Nonzero reserved");
+ }
+ if (!table.ReadU32(&this->reserved2)) {
+ return DropGraphite("Failed to read valid reserved2");
+ }
+ if (this->reserved2 != 0) {
+ Warning("Nonzero reserved2");
+ }
+
+ std::unordered_set<size_t> unverified;
+ //this->features.resize(this->numFeat, this);
+ for (unsigned i = 0; i < this->numFeat; ++i) {
+ this->features.emplace_back(this);
+ FeatureDefn& feature = this->features[i];
+ if (!feature.ParsePart(table)) {
+ return DropGraphite("Failed to read features[%u]", i);
+ }
+ this->feature_ids.insert(feature.id);
+ for (unsigned j = 0; j < feature.numSettings; ++j) {
+ size_t offset = feature.offset + j * 4;
+ if (offset < feature.offset || offset > length) {
+ return DropGraphite("Invalid FeatSettingDefn offset %zu/%zu",
+ offset, length);
+ }
+ unverified.insert(offset);
+ // need to verify that this FeatureDefn points to valid
+ // FeatureSettingDefn
+ }
+ }
+
+ while (table.remaining()) {
+ bool used = unverified.erase(table.offset());
+ FeatureSettingDefn featSetting(this);
+ if (!featSetting.ParsePart(table, used)) {
+ return DropGraphite("Failed to read a FeatureSettingDefn");
+ }
+ featSettings.push_back(featSetting);
+ }
+
+ if (!unverified.empty()) {
+ return DropGraphite("%zu incorrect offsets into featSettings",
+ unverified.size());
+ }
+ if (table.remaining()) {
+ return Warning("%zu bytes unparsed", table.remaining());
+ }
+ return true;
+}
+
+bool OpenTypeFEAT::Serialize(OTSStream* out) {
+ if (!out->WriteU32(this->version) ||
+ !out->WriteU16(this->numFeat) ||
+ !out->WriteU16(this->reserved) ||
+ !out->WriteU32(this->reserved2) ||
+ !SerializeParts(this->features, out) ||
+ !SerializeParts(this->featSettings, out)) {
+ return Error("Failed to write table");
+ }
+ return true;
+}
+
+bool OpenTypeFEAT::IsValidFeatureId(uint32_t id) const {
+ return feature_ids.count(id);
+}
+
+bool OpenTypeFEAT::FeatureDefn::ParsePart(Buffer& table) {
+ OpenTypeNAME* name = static_cast<OpenTypeNAME*>(
+ parent->GetFont()->GetTypedTable(OTS_TAG_NAME));
+ if (!name) {
+ return parent->Error("FeatureDefn: Required name table is missing");
+ }
+
+ if (parent->version >> 16 >= 2 && !table.ReadU32(&this->id)) {
+ return parent->Error("FeatureDefn: Failed to read id");
+ }
+ if (parent->version >> 16 == 1) {
+ uint16_t id;
+ if (!table.ReadU16(&id)) {
+ return parent->Error("FeatureDefn: Failed to read id");
+ }
+ this->id = id;
+ }
+ if (!table.ReadU16(&this->numSettings)) {
+ return parent->Error("FeatureDefn: Failed to read numSettings");
+ }
+ if (parent->version >> 16 >= 2) {
+ if (!table.ReadU16(&this->reserved)) {
+ return parent->Error("FeatureDefn: Failed to read reserved");
+ }
+ if (this->reserved != 0) {
+ parent->Warning("FeatureDefn: Nonzero reserved");
+ }
+ }
+ if (!table.ReadU32(&this->offset)) {
+ return parent->Error("FeatureDefn: Failed to read offset");
+ } // validity of offset verified in OpenTypeFEAT::Parse
+ if (!table.ReadU16(&this->flags)) {
+ return parent->Error("FeatureDefn: Failed to read flags");
+ }
+ if ((this->flags & RESERVED) != 0) {
+ this->flags &= ~RESERVED;
+ parent->Warning("FeatureDefn: Nonzero (flags & 0x%x) repaired", RESERVED);
+ }
+ if (this->flags & HAS_DEFAULT_SETTING &&
+ (this->flags & DEFAULT_SETTING) >= this->numSettings) {
+ return parent->Error("FeatureDefn: (flags & 0x%x) is set but (flags & 0x%x "
+ "is not a valid setting index", HAS_DEFAULT_SETTING,
+ DEFAULT_SETTING);
+ }
+ if (!table.ReadU16(&this->label)) {
+ return parent->Error("FeatureDefn: Failed to read label");
+ }
+ if (!name->IsValidNameId(this->label)) {
+ if (this->id == 1 && name->IsValidNameId(this->label, true)) {
+ parent->Warning("FeatureDefn: Missing NameRecord repaired for feature"
+ " with id=%u, label=%u", this->id, this->label);
+ }
+ else {
+ return parent->Error("FeatureDefn: Invalid label");
+ }
+ }
+ return true;
+}
+
+bool OpenTypeFEAT::FeatureDefn::SerializePart(OTSStream* out) const {
+ if ((parent->version >> 16 >= 2 && !out->WriteU32(this->id)) ||
+ (parent->version >> 16 == 1 &&
+ !out->WriteU16(static_cast<uint16_t>(this->id))) ||
+ !out->WriteU16(this->numSettings) ||
+ (parent->version >> 16 >= 2 && !out->WriteU16(this->reserved)) ||
+ !out->WriteU32(this->offset) ||
+ !out->WriteU16(this->flags) ||
+ !out->WriteU16(this->label)) {
+ return parent->Error("FeatureDefn: Failed to write");
+ }
+ return true;
+}
+
+bool OpenTypeFEAT::FeatureSettingDefn::ParsePart(Buffer& table, bool used) {
+ OpenTypeNAME* name = static_cast<OpenTypeNAME*>(
+ parent->GetFont()->GetTypedTable(OTS_TAG_NAME));
+ if (!name) {
+ return parent->Error("FeatureSettingDefn: Required name table is missing");
+ }
+
+ if (!table.ReadS16(&this->value)) {
+ return parent->Error("FeatureSettingDefn: Failed to read value");
+ }
+ if (!table.ReadU16(&this->label) ||
+ (used && !name->IsValidNameId(this->label))) {
+ return parent->Error("FeatureSettingDefn: Failed to read valid label");
+ }
+ return true;
+}
+
+bool OpenTypeFEAT::FeatureSettingDefn::SerializePart(OTSStream* out) const {
+ if (!out->WriteS16(this->value) ||
+ !out->WriteU16(this->label)) {
+ return parent->Error("FeatureSettingDefn: Failed to write");
+ }
+ return true;
+}
+
+} // namespace ots