96 lines
2.8 KiB
C++
96 lines
2.8 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 "vvar.h"
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#include "variations.h"
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namespace ots {
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// -----------------------------------------------------------------------------
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// OpenTypeVVAR
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// -----------------------------------------------------------------------------
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bool OpenTypeVVAR::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 advanceHeightMappingOffset;
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uint32_t tsbMappingOffset;
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uint32_t bsbMappingOffset;
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uint32_t vOrgMappingOffset;
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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(&advanceHeightMappingOffset) ||
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!table.ReadU32(&tsbMappingOffset) ||
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!table.ReadU32(&bsbMappingOffset) ||
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!table.ReadU32(&vOrgMappingOffset)) {
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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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advanceHeightMappingOffset > length ||
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tsbMappingOffset > length ||
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bsbMappingOffset > length ||
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vOrgMappingOffset > 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 (advanceHeightMappingOffset) {
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if (!ParseDeltaSetIndexMap(GetFont(), data + advanceHeightMappingOffset,
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length - advanceHeightMappingOffset)) {
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return DropVariations("Failed to parse advance height mappings");
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}
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}
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if (tsbMappingOffset) {
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if (!ParseDeltaSetIndexMap(GetFont(), data + tsbMappingOffset,
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length - tsbMappingOffset)) {
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return DropVariations("Failed to parse TSB mappings");
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}
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}
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if (bsbMappingOffset) {
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if (!ParseDeltaSetIndexMap(GetFont(), data + bsbMappingOffset,
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length - bsbMappingOffset)) {
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return DropVariations("Failed to parse BSB mappings");
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}
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}
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if (vOrgMappingOffset) {
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if (!ParseDeltaSetIndexMap(GetFont(), data + vOrgMappingOffset,
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length - vOrgMappingOffset)) {
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return DropVariations("Failed to parse vOrg 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 OpenTypeVVAR::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 VVAR 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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