109 lines
3.4 KiB
C++
109 lines
3.4 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 "gloc.h"
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#include "name.h"
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namespace ots {
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bool OpenTypeGLOC::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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OpenTypeNAME* name = static_cast<OpenTypeNAME*>(
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GetFont()->GetTypedTable(OTS_TAG_NAME));
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if (!name) {
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return DropGraphite("Required name table is missing");
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}
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if (!table.ReadU32(&this->version)) {
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return DropGraphite("Failed to read version");
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}
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if (this->version >> 16 != 1) {
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return DropGraphite("Unsupported table version: %u", this->version >> 16);
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}
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if (!table.ReadU16(&this->flags) || this->flags > 0b11) {
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return DropGraphite("Failed to read valid flags");
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}
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if (!table.ReadU16(&this->numAttribs)) {
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return DropGraphite("Failed to read numAttribs");
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}
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if (this->flags & ATTRIB_IDS && this->numAttribs * sizeof(uint16_t) >
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table.remaining()) {
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return DropGraphite("Failed to calulate length of locations");
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}
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size_t locations_len = (table.remaining() -
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(this->flags & ATTRIB_IDS ? this->numAttribs * sizeof(uint16_t) : 0)) /
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(this->flags & LONG_FORMAT ? sizeof(uint32_t) : sizeof(uint16_t));
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//this->locations.resize(locations_len);
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if (this->flags & LONG_FORMAT) {
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unsigned long last_location = 0;
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for (size_t i = 0; i < locations_len; ++i) {
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this->locations.emplace_back();
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uint32_t& location = this->locations[i];
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if (!table.ReadU32(&location) || location < last_location) {
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return DropGraphite("Failed to read valid locations[%lu]", i);
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}
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last_location = location;
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}
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} else { // short (16-bit) offsets
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unsigned last_location = 0;
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for (size_t i = 0; i < locations_len; ++i) {
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uint16_t location;
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if (!table.ReadU16(&location) || location < last_location) {
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return DropGraphite("Failed to read valid locations[%lu]", i);
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}
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last_location = location;
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this->locations.push_back(static_cast<uint32_t>(location));
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}
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}
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if (this->locations.empty()) {
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return DropGraphite("No locations");
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}
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if (this->flags & ATTRIB_IDS) { // attribIds array present
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//this->attribIds.resize(numAttribs);
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for (unsigned i = 0; i < this->numAttribs; ++i) {
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this->attribIds.emplace_back();
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if (!table.ReadU16(&this->attribIds[i]) ||
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!name->IsValidNameId(this->attribIds[i])) {
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return DropGraphite("Failed to read valid attribIds[%u]", i);
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}
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}
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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 OpenTypeGLOC::Serialize(OTSStream* out) {
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if (!out->WriteU32(this->version) ||
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!out->WriteU16(this->flags) ||
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!out->WriteU16(this->numAttribs) ||
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(this->flags & LONG_FORMAT ? !SerializeParts(this->locations, out) :
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![&] {
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for (uint32_t location : this->locations) {
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if (!out->WriteU16(static_cast<uint16_t>(location))) {
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return false;
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}
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}
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return true;
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}()) ||
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(this->flags & ATTRIB_IDS && !SerializeParts(this->attribIds, 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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const std::vector<uint32_t>& OpenTypeGLOC::GetLocations() {
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return this->locations;
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}
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} // namespace ots
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