1 files changed, 108 insertions, 0 deletions
diff --git a/libs/ots/src/gloc.cc b/libs/ots/src/gloc.cc
new file mode 100644
index 000000000..9c5ee3bdf
--- /dev/null
+++ b/libs/ots/src/gloc.cc
@@ -0,0 +1,108 @@
+// 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 "gloc.h"
+
+#include "name.h"
+
+namespace ots {
+
+bool OpenTypeGLOC::Parse(const uint8_t* data, size_t length) {
+  if (GetFont()->dropped_graphite) {
+    return Drop("Skipping Graphite table");
+  }
+  Buffer table(data, length);
+  OpenTypeNAME* name = static_cast<OpenTypeNAME*>(
+      GetFont()->GetTypedTable(OTS_TAG_NAME));
+  if (!name) {
+    return DropGraphite("Required name table is missing");
+  }
+
+  if (!table.ReadU32(&this->version)) {
+    return DropGraphite("Failed to read version");
+  }
+  if (this->version >> 16 != 1) {
+    return DropGraphite("Unsupported table version: %u", this->version >> 16);
+  }
+  if (!table.ReadU16(&this->flags) || this->flags > 0b11) {
+    return DropGraphite("Failed to read valid flags");
+  }
+  if (!table.ReadU16(&this->numAttribs)) {
+    return DropGraphite("Failed to read numAttribs");
+  }
+
+  if (this->flags & ATTRIB_IDS && this->numAttribs * sizeof(uint16_t) >
+                                  table.remaining()) {
+    return DropGraphite("Failed to calulate length of locations");
+  }
+  size_t locations_len = (table.remaining() -
+    (this->flags & ATTRIB_IDS ? this->numAttribs * sizeof(uint16_t) : 0)) /
+    (this->flags & LONG_FORMAT ? sizeof(uint32_t) : sizeof(uint16_t));
+  //this->locations.resize(locations_len);
+  if (this->flags & LONG_FORMAT) {
+    unsigned long last_location = 0;
+    for (size_t i = 0; i < locations_len; ++i) {
+      this->locations.emplace_back();
+      uint32_t& location = this->locations[i];
+      if (!table.ReadU32(&location) || location < last_location) {
+        return DropGraphite("Failed to read valid locations[%lu]", i);
+      }
+      last_location = location;
+    }
+  } else {  // short (16-bit) offsets
+    unsigned last_location = 0;
+    for (size_t i = 0; i < locations_len; ++i) {
+      uint16_t location;
+      if (!table.ReadU16(&location) || location < last_location) {
+        return DropGraphite("Failed to read valid locations[%lu]", i);
+      }
+      last_location = location;
+      this->locations.push_back(static_cast<uint32_t>(location));
+    }
+  }
+  if (this->locations.empty()) {
+    return DropGraphite("No locations");
+  }
+
+  if (this->flags & ATTRIB_IDS) {  // attribIds array present
+    //this->attribIds.resize(numAttribs);
+    for (unsigned i = 0; i < this->numAttribs; ++i) {
+      this->attribIds.emplace_back();
+      if (!table.ReadU16(&this->attribIds[i]) ||
+          !name->IsValidNameId(this->attribIds[i])) {
+        return DropGraphite("Failed to read valid attribIds[%u]", i);
+      }
+    }
+  }
+
+  if (table.remaining()) {
+    return Warning("%zu bytes unparsed", table.remaining());
+  }
+  return true;
+}
+
+bool OpenTypeGLOC::Serialize(OTSStream* out) {
+  if (!out->WriteU32(this->version) ||
+      !out->WriteU16(this->flags) ||
+      !out->WriteU16(this->numAttribs) ||
+      (this->flags & LONG_FORMAT ? !SerializeParts(this->locations, out) :
+       ![&] {
+         for (uint32_t location : this->locations) {
+           if (!out->WriteU16(static_cast<uint16_t>(location))) {
+             return false;
+           }
+         }
+         return true;
+       }()) ||
+      (this->flags & ATTRIB_IDS && !SerializeParts(this->attribIds, out))) {
+    return Error("Failed to write table");
+  }
+  return true;
+}
+
+const std::vector<uint32_t>& OpenTypeGLOC::GetLocations() {
+  return this->locations;
+}
+
+}  // namespace ots