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// Copyright (c) 2009-2017 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 "gloc.h"
#include "name.h"
namespace ots {
bool OpenTypeGLOC::Parse(const uint8_t* data, size_t length) {
if (GetFont()->dropped_graphite) {
return Drop("Skipping Graphite table");
}
Buffer table(data, length);
OpenTypeNAME* name = static_cast<OpenTypeNAME*>(
GetFont()->GetTypedTable(OTS_TAG_NAME));
if (!name) {
return DropGraphite("Required name table is missing");
}
if (!table.ReadU32(&this->version)) {
return DropGraphite("Failed to read version");
}
if (this->version >> 16 != 1) {
return DropGraphite("Unsupported table version: %u", this->version >> 16);
}
if (!table.ReadU16(&this->flags) || this->flags > 0b11) {
return DropGraphite("Failed to read valid flags");
}
if (!table.ReadU16(&this->numAttribs)) {
return DropGraphite("Failed to read numAttribs");
}
if (this->flags & ATTRIB_IDS && this->numAttribs * sizeof(uint16_t) >
table.remaining()) {
return DropGraphite("Failed to calulate length of locations");
}
size_t locations_len = (table.remaining() -
(this->flags & ATTRIB_IDS ? this->numAttribs * sizeof(uint16_t) : 0)) /
(this->flags & LONG_FORMAT ? sizeof(uint32_t) : sizeof(uint16_t));
//this->locations.resize(locations_len);
if (this->flags & LONG_FORMAT) {
unsigned long last_location = 0;
for (size_t i = 0; i < locations_len; ++i) {
this->locations.emplace_back();
uint32_t& location = this->locations[i];
if (!table.ReadU32(&location) || location < last_location) {
return DropGraphite("Failed to read valid locations[%lu]", i);
}
last_location = location;
}
} else { // short (16-bit) offsets
unsigned last_location = 0;
for (size_t i = 0; i < locations_len; ++i) {
uint16_t location;
if (!table.ReadU16(&location) || location < last_location) {
return DropGraphite("Failed to read valid locations[%lu]", i);
}
last_location = location;
this->locations.push_back(static_cast<uint32_t>(location));
}
}
if (this->locations.empty()) {
return DropGraphite("No locations");
}
if (this->flags & ATTRIB_IDS) { // attribIds array present
//this->attribIds.resize(numAttribs);
for (unsigned i = 0; i < this->numAttribs; ++i) {
this->attribIds.emplace_back();
if (!table.ReadU16(&this->attribIds[i]) ||
!name->IsValidNameId(this->attribIds[i])) {
return DropGraphite("Failed to read valid attribIds[%u]", i);
}
}
}
if (table.remaining()) {
return Warning("%zu bytes unparsed", table.remaining());
}
return true;
}
bool OpenTypeGLOC::Serialize(OTSStream* out) {
if (!out->WriteU32(this->version) ||
!out->WriteU16(this->flags) ||
!out->WriteU16(this->numAttribs) ||
(this->flags & LONG_FORMAT ? !SerializeParts(this->locations, out) :
![&] {
for (uint32_t location : this->locations) {
if (!out->WriteU16(static_cast<uint16_t>(location))) {
return false;
}
}
return true;
}()) ||
(this->flags & ATTRIB_IDS && !SerializeParts(this->attribIds, out))) {
return Error("Failed to write table");
}
return true;
}
const std::vector<uint32_t>& OpenTypeGLOC::GetLocations() {
return this->locations;
}
} // namespace ots
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