460 lines
15 KiB
C++
460 lines
15 KiB
C++
// Copyright (c) 2009-2017 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 "glat.h"
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#include "gloc.h"
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#include "mozilla/Compression.h"
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#include <list>
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namespace ots {
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// -----------------------------------------------------------------------------
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// OpenTypeGLAT_v1
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// -----------------------------------------------------------------------------
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bool OpenTypeGLAT_v1::Parse(const uint8_t* data, size_t length) {
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Buffer table(data, length);
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OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
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GetFont()->GetTypedTable(OTS_TAG_GLOC));
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if (!gloc) {
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return DropGraphite("Required Gloc table is missing");
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}
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if (!table.ReadU32(&this->version) || this->version >> 16 != 1) {
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return DropGraphite("Failed to read version");
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}
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const std::vector<uint32_t>& locations = gloc->GetLocations();
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if (locations.empty()) {
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return DropGraphite("No locations from Gloc table");
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}
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std::list<uint32_t> unverified(locations.begin(), locations.end());
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while (table.remaining()) {
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GlatEntry entry(this);
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if (table.offset() > unverified.front()) {
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return DropGraphite("Offset check failed for a GlatEntry");
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}
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if (table.offset() == unverified.front()) {
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unverified.pop_front();
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}
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if (unverified.empty()) {
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return DropGraphite("Expected more locations");
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}
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if (!entry.ParsePart(table)) {
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return DropGraphite("Failed to read a GlatEntry");
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}
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this->entries.push_back(entry);
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}
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if (unverified.size() != 1 || unverified.front() != table.offset()) {
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return DropGraphite("%zu location(s) could not be verified", unverified.size());
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}
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if (table.remaining()) {
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return Warning("%zu bytes unparsed", table.remaining());
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}
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return true;
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}
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bool OpenTypeGLAT_v1::Serialize(OTSStream* out) {
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if (!out->WriteU32(this->version) ||
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!SerializeParts(this->entries, out)) {
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return Error("Failed to write table");
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}
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return true;
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}
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bool OpenTypeGLAT_v1::GlatEntry::ParsePart(Buffer& table) {
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if (!table.ReadU8(&this->attNum)) {
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return parent->Error("GlatEntry: Failed to read attNum");
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}
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if (!table.ReadU8(&this->num)) {
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return parent->Error("GlatEntry: Failed to read num");
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}
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//this->attributes.resize(this->num);
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for (int i = 0; i < this->num; ++i) {
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this->attributes.emplace_back();
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if (!table.ReadS16(&this->attributes[i])) {
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return parent->Error("GlatEntry: Failed to read attribute %u", i);
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}
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}
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return true;
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}
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bool OpenTypeGLAT_v1::GlatEntry::SerializePart(OTSStream* out) const {
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if (!out->WriteU8(this->attNum) ||
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!out->WriteU8(this->num) ||
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!SerializeParts(this->attributes, out)) {
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return parent->Error("GlatEntry: Failed to write");
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}
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return true;
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}
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// -----------------------------------------------------------------------------
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// OpenTypeGLAT_v2
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// -----------------------------------------------------------------------------
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bool OpenTypeGLAT_v2::Parse(const uint8_t* data, size_t length) {
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Buffer table(data, length);
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OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
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GetFont()->GetTypedTable(OTS_TAG_GLOC));
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if (!gloc) {
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return DropGraphite("Required Gloc table is missing");
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}
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if (!table.ReadU32(&this->version) || this->version >> 16 != 1) {
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return DropGraphite("Failed to read version");
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}
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const std::vector<uint32_t>& locations = gloc->GetLocations();
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if (locations.empty()) {
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return DropGraphite("No locations from Gloc table");
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}
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std::list<uint32_t> unverified(locations.begin(), locations.end());
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while (table.remaining()) {
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GlatEntry entry(this);
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if (table.offset() > unverified.front()) {
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return DropGraphite("Offset check failed for a GlatEntry");
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}
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if (table.offset() == unverified.front()) {
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unverified.pop_front();
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}
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if (unverified.empty()) {
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return DropGraphite("Expected more locations");
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}
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if (!entry.ParsePart(table)) {
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return DropGraphite("Failed to read a GlatEntry");
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}
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this->entries.push_back(entry);
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}
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if (unverified.size() != 1 || unverified.front() != table.offset()) {
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return DropGraphite("%zu location(s) could not be verified", unverified.size());
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}
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if (table.remaining()) {
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return Warning("%zu bytes unparsed", table.remaining());
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}
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return true;
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}
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bool OpenTypeGLAT_v2::Serialize(OTSStream* out) {
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if (!out->WriteU32(this->version) ||
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!SerializeParts(this->entries, out)) {
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return Error("Failed to write table");
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}
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return true;
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}
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bool OpenTypeGLAT_v2::GlatEntry::ParsePart(Buffer& table) {
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if (!table.ReadS16(&this->attNum)) {
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return parent->Error("GlatEntry: Failed to read attNum");
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}
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if (!table.ReadS16(&this->num) || this->num < 0) {
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return parent->Error("GlatEntry: Failed to read valid num");
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}
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//this->attributes.resize(this->num);
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for (int i = 0; i < this->num; ++i) {
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this->attributes.emplace_back();
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if (!table.ReadS16(&this->attributes[i])) {
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return parent->Error("GlatEntry: Failed to read attribute %u", i);
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}
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}
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return true;
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}
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bool OpenTypeGLAT_v2::GlatEntry::SerializePart(OTSStream* out) const {
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if (!out->WriteS16(this->attNum) ||
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!out->WriteS16(this->num) ||
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!SerializeParts(this->attributes, out)) {
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return parent->Error("GlatEntry: Failed to write");
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}
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return true;
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}
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// -----------------------------------------------------------------------------
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// OpenTypeGLAT_v3
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// -----------------------------------------------------------------------------
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bool OpenTypeGLAT_v3::Parse(const uint8_t* data, size_t length,
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bool prevent_decompression) {
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Buffer table(data, length);
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OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
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GetFont()->GetTypedTable(OTS_TAG_GLOC));
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if (!gloc) {
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return DropGraphite("Required Gloc table is missing");
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}
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if (!table.ReadU32(&this->version) || this->version >> 16 != 3) {
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return DropGraphite("Failed to read version");
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}
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if (!table.ReadU32(&this->compHead)) {
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return DropGraphite("Failed to read compression header");
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}
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switch ((this->compHead & SCHEME) >> 27) {
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case 0: // uncompressed
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break;
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case 1: { // lz4
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if (prevent_decompression) {
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return DropGraphite("Illegal nested compression");
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}
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size_t decompressed_size = this->compHead & FULL_SIZE;
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if (decompressed_size < length) {
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return DropGraphite("Decompressed size is less than compressed size");
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}
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if (decompressed_size == 0) {
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return DropGraphite("Decompressed size is set to 0");
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}
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// decompressed table must be <= 30MB
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if (decompressed_size > 30 * 1024 * 1024) {
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return DropGraphite("Decompressed size exceeds 30MB: %gMB",
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decompressed_size / (1024.0 * 1024.0));
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}
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std::vector<uint8_t> decompressed(decompressed_size);
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size_t outputSize = 0;
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bool ret = mozilla::Compression::LZ4::decompressPartial(
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reinterpret_cast<const char*>(data + table.offset()),
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table.remaining(), // input buffer size (input size + padding)
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reinterpret_cast<char*>(decompressed.data()),
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decompressed.size(), // target output size
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&outputSize); // return output size
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if (!ret || outputSize != decompressed.size()) {
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return DropGraphite("Decompression failed");
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}
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return this->Parse(decompressed.data(), decompressed.size(), true);
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}
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default:
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return DropGraphite("Unknown compression scheme");
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}
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if (this->compHead & RESERVED) {
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Warning("Nonzero reserved");
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}
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const std::vector<uint32_t>& locations = gloc->GetLocations();
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if (locations.empty()) {
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return DropGraphite("No locations from Gloc table");
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}
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std::list<uint32_t> unverified(locations.begin(), locations.end());
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//this->entries.resize(locations.size() - 1, this);
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for (size_t i = 0; i < locations.size() - 1; ++i) {
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this->entries.emplace_back(this);
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if (table.offset() != unverified.front()) {
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return DropGraphite("Offset check failed for a GlyphAttrs");
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}
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unverified.pop_front();
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if (!this->entries[i].ParsePart(table,
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unverified.front() - table.offset())) {
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// unverified.front() is guaranteed to exist because of the number of
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// iterations of this loop
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return DropGraphite("Failed to read a GlyphAttrs");
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}
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}
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if (unverified.size() != 1 || unverified.front() != table.offset()) {
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return DropGraphite("%zu location(s) could not be verified", unverified.size());
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}
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if (table.remaining()) {
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return Warning("%zu bytes unparsed", table.remaining());
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}
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return true;
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}
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bool OpenTypeGLAT_v3::Serialize(OTSStream* out) {
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if (!out->WriteU32(this->version) ||
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!out->WriteU32(this->compHead) ||
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!SerializeParts(this->entries, out)) {
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return Error("Failed to write table");
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::ParsePart(Buffer& table, const size_t size) {
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size_t init_offset = table.offset();
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if (parent->compHead & OCTABOXES && !octabox.ParsePart(table)) {
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// parent->flags & 0b1: octaboxes are present flag
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return parent->Error("GlyphAttrs: Failed to read octabox");
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}
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while (table.offset() < init_offset + size) {
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GlatEntry entry(parent);
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if (!entry.ParsePart(table)) {
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return parent->Error("GlyphAttrs: Failed to read a GlatEntry");
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}
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this->entries.push_back(entry);
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::SerializePart(OTSStream* out) const {
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if ((parent->compHead & OCTABOXES && !octabox.SerializePart(out)) ||
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!SerializeParts(this->entries, out)) {
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return parent->Error("GlyphAttrs: Failed to write");
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::
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OctaboxMetrics::ParsePart(Buffer& table) {
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if (!table.ReadU16(&this->subbox_bitmap)) {
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return parent->Error("OctaboxMetrics: Failed to read subbox_bitmap");
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}
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if (!table.ReadU8(&this->diag_neg_min)) {
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return parent->Error("OctaboxMetrics: Failed to read diag_neg_min");
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}
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if (!table.ReadU8(&this->diag_neg_max) ||
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this->diag_neg_max < this->diag_neg_min) {
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return parent->Error("OctaboxMetrics: Failed to read valid diag_neg_max");
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}
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if (!table.ReadU8(&this->diag_pos_min)) {
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return parent->Error("OctaboxMetrics: Failed to read diag_pos_min");
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}
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if (!table.ReadU8(&this->diag_pos_max) ||
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this->diag_pos_max < this->diag_pos_min) {
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return parent->Error("OctaboxMetrics: Failed to read valid diag_pos_max");
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}
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unsigned subboxes_len = 0; // count of 1's in this->subbox_bitmap
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for (uint16_t i = this->subbox_bitmap; i; i >>= 1) {
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if (i & 0b1) {
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++subboxes_len;
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}
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}
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//this->subboxes.resize(subboxes_len, parent);
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for (unsigned i = 0; i < subboxes_len; i++) {
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this->subboxes.emplace_back(parent);
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if (!this->subboxes[i].ParsePart(table)) {
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return parent->Error("OctaboxMetrics: Failed to read subbox[%u]", i);
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}
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::
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OctaboxMetrics::SerializePart(OTSStream* out) const {
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if (!out->WriteU16(this->subbox_bitmap) ||
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!out->WriteU8(this->diag_neg_min) ||
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!out->WriteU8(this->diag_neg_max) ||
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!out->WriteU8(this->diag_pos_min) ||
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!out->WriteU8(this->diag_pos_max) ||
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!SerializeParts(this->subboxes, out)) {
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return parent->Error("OctaboxMetrics: Failed to write");
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
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SubboxEntry::ParsePart(Buffer& table) {
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if (!table.ReadU8(&this->left)) {
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return parent->Error("SubboxEntry: Failed to read left");
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}
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if (!table.ReadU8(&this->right) || this->right < this->left) {
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return parent->Error("SubboxEntry: Failed to read valid right");
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}
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if (!table.ReadU8(&this->bottom)) {
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return parent->Error("SubboxEntry: Failed to read bottom");
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}
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if (!table.ReadU8(&this->top) || this->top < this->bottom) {
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return parent->Error("SubboxEntry: Failed to read valid top");
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}
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if (!table.ReadU8(&this->diag_pos_min)) {
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return parent->Error("SubboxEntry: Failed to read diag_pos_min");
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}
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if (!table.ReadU8(&this->diag_pos_max) ||
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this->diag_pos_max < this->diag_pos_min) {
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return parent->Error("SubboxEntry: Failed to read valid diag_pos_max");
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}
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if (!table.ReadU8(&this->diag_neg_min)) {
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return parent->Error("SubboxEntry: Failed to read diag_neg_min");
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}
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if (!table.ReadU8(&this->diag_neg_max) ||
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this->diag_neg_max < this->diag_neg_min) {
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return parent->Error("SubboxEntry: Failed to read valid diag_neg_max");
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
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SubboxEntry::SerializePart(OTSStream* out) const {
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if (!out->WriteU8(this->left) ||
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!out->WriteU8(this->right) ||
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!out->WriteU8(this->bottom) ||
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!out->WriteU8(this->top) ||
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!out->WriteU8(this->diag_pos_min) ||
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!out->WriteU8(this->diag_pos_max) ||
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!out->WriteU8(this->diag_neg_min) ||
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!out->WriteU8(this->diag_neg_max)) {
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return parent->Error("SubboxEntry: Failed to write");
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::
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GlatEntry::ParsePart(Buffer& table) {
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if (!table.ReadS16(&this->attNum)) {
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return parent->Error("GlatEntry: Failed to read attNum");
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}
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if (!table.ReadS16(&this->num) || this->num < 0) {
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return parent->Error("GlatEntry: Failed to read valid num");
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}
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//this->attributes.resize(this->num);
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for (int i = 0; i < this->num; ++i) {
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this->attributes.emplace_back();
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if (!table.ReadS16(&this->attributes[i])) {
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return parent->Error("GlatEntry: Failed to read attribute %u", i);
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}
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}
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return true;
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}
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bool OpenTypeGLAT_v3::GlyphAttrs::
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GlatEntry::SerializePart(OTSStream* out) const {
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if (!out->WriteS16(this->attNum) ||
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!out->WriteS16(this->num) ||
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!SerializeParts(this->attributes, out)) {
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return parent->Error("GlatEntry: Failed to write");
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}
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return true;
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}
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// -----------------------------------------------------------------------------
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// OpenTypeGLAT
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// -----------------------------------------------------------------------------
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bool OpenTypeGLAT::Parse(const uint8_t* data, size_t length) {
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if (GetFont()->dropped_graphite) {
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return Drop("Skipping Graphite table");
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}
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Buffer table(data, length);
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uint32_t version;
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if (!table.ReadU32(&version)) {
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return DropGraphite("Failed to read version");
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}
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switch (version >> 16) {
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case 1:
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this->handler = new OpenTypeGLAT_v1(this->font, this->tag);
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break;
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case 2:
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this->handler = new OpenTypeGLAT_v2(this->font, this->tag);
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break;
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case 3: {
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this->handler = new OpenTypeGLAT_v3(this->font, this->tag);
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break;
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}
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default:
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return DropGraphite("Unsupported table version: %u", version >> 16);
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}
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return this->handler->Parse(data, length);
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}
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bool OpenTypeGLAT::Serialize(OTSStream* out) {
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if (!this->handler) {
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return Error("No Glat table parsed");
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}
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return this->handler->Serialize(out);
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}
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} // namespace ots
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