86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// Copyright (c) 2018 The OTS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "hvar.h"
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#include "variations.h"
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namespace ots {
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// -----------------------------------------------------------------------------
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// OpenTypeHVAR
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// -----------------------------------------------------------------------------
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bool OpenTypeHVAR::Parse(const uint8_t* data, size_t length) {
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Buffer table(data, length);
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uint16_t majorVersion;
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uint16_t minorVersion;
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uint32_t itemVariationStoreOffset;
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uint32_t advanceWidthMappingOffset;
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uint32_t lsbMappingOffset;
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uint32_t rsbMappingOffset;
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if (!table.ReadU16(&majorVersion) ||
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!table.ReadU16(&minorVersion) ||
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!table.ReadU32(&itemVariationStoreOffset) ||
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!table.ReadU32(&advanceWidthMappingOffset) ||
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!table.ReadU32(&lsbMappingOffset) ||
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!table.ReadU32(&rsbMappingOffset)) {
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return DropVariations("Failed to read table header");
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}
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if (majorVersion != 1) {
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return DropVariations("Unknown table version");
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}
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if (itemVariationStoreOffset > length ||
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advanceWidthMappingOffset > length ||
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lsbMappingOffset > length ||
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rsbMappingOffset > length) {
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return DropVariations("Invalid subtable offset");
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}
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if (!ParseItemVariationStore(GetFont(), data + itemVariationStoreOffset,
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length - itemVariationStoreOffset)) {
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return DropVariations("Failed to parse item variation store");
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}
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if (advanceWidthMappingOffset) {
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if (!ParseDeltaSetIndexMap(GetFont(), data + advanceWidthMappingOffset,
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length - advanceWidthMappingOffset)) {
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return DropVariations("Failed to parse advance width mappings");
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}
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}
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if (lsbMappingOffset) {
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if (!ParseDeltaSetIndexMap(GetFont(), data + lsbMappingOffset,
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length - lsbMappingOffset)) {
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return DropVariations("Failed to parse LSB mappings");
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}
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}
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if (rsbMappingOffset) {
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if (!ParseDeltaSetIndexMap(GetFont(), data + rsbMappingOffset,
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length - rsbMappingOffset)) {
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return DropVariations("Failed to parse RSB mappings");
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}
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}
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this->m_data = data;
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this->m_length = length;
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return true;
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}
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bool OpenTypeHVAR::Serialize(OTSStream* out) {
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if (!out->Write(this->m_data, this->m_length)) {
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return Error("Failed to write HVAR table");
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}
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return true;
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}
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} // namespace ots
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