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// 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
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