1 files changed, 85 insertions, 0 deletions
diff --git a/gfx/ots/src/hvar.cc b/gfx/ots/src/hvar.cc
new file mode 100644
index 0000000000..2bcea86803
--- /dev/null
+++ b/gfx/ots/src/hvar.cc
@@ -0,0 +1,85 @@
+// Copyright (c) 2018 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 "hvar.h"
+
+#include "variations.h"
+
+namespace ots {
+
+// -----------------------------------------------------------------------------
+// OpenTypeHVAR
+// -----------------------------------------------------------------------------
+
+bool OpenTypeHVAR::Parse(const uint8_t* data, size_t length) {
+  Buffer table(data, length);
+
+  uint16_t majorVersion;
+  uint16_t minorVersion;
+  uint32_t itemVariationStoreOffset;
+  uint32_t advanceWidthMappingOffset;
+  uint32_t lsbMappingOffset;
+  uint32_t rsbMappingOffset;
+
+  if (!table.ReadU16(&majorVersion) ||
+      !table.ReadU16(&minorVersion) ||
+      !table.ReadU32(&itemVariationStoreOffset) ||
+      !table.ReadU32(&advanceWidthMappingOffset) ||
+      !table.ReadU32(&lsbMappingOffset) ||
+      !table.ReadU32(&rsbMappingOffset)) {
+    return DropVariations("Failed to read table header");
+  }
+
+  if (majorVersion != 1) {
+    return DropVariations("Unknown table version");
+  }
+
+  if (itemVariationStoreOffset > length ||
+      advanceWidthMappingOffset > length ||
+      lsbMappingOffset > length ||
+      rsbMappingOffset > length) {
+    return DropVariations("Invalid subtable offset");
+  }
+
+  if (!ParseItemVariationStore(GetFont(), data + itemVariationStoreOffset,
+                               length - itemVariationStoreOffset)) {
+    return DropVariations("Failed to parse item variation store");
+  }
+
+  if (advanceWidthMappingOffset) {
+    if (!ParseDeltaSetIndexMap(GetFont(), data + advanceWidthMappingOffset,
+                               length - advanceWidthMappingOffset)) {
+      return DropVariations("Failed to parse advance width mappings");
+    }
+  }
+
+  if (lsbMappingOffset) {
+    if (!ParseDeltaSetIndexMap(GetFont(), data + lsbMappingOffset,
+                               length - lsbMappingOffset)) {
+      return DropVariations("Failed to parse LSB mappings");
+    }
+  }
+
+  if (rsbMappingOffset) {
+    if (!ParseDeltaSetIndexMap(GetFont(), data + rsbMappingOffset,
+                               length - rsbMappingOffset)) {
+      return DropVariations("Failed to parse RSB mappings");
+    }
+  }
+
+  this->m_data = data;
+  this->m_length = length;
+
+  return true;
+}
+
+bool OpenTypeHVAR::Serialize(OTSStream* out) {
+  if (!out->Write(this->m_data, this->m_length)) {
+    return Error("Failed to write HVAR table");
+  }
+
+  return true;
+}
+
+}  // namespace ots