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-rw-r--r--gfx/ots/src/gloc.cc105
1 files changed, 105 insertions, 0 deletions
diff --git a/gfx/ots/src/gloc.cc b/gfx/ots/src/gloc.cc
new file mode 100644
index 0000000000..396e14a13d
--- /dev/null
+++ b/gfx/ots/src/gloc.cc
@@ -0,0 +1,105 @@
+// 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) {
+ 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 calculate 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