Source code
Revision control
Copy as Markdown
Other Tools
// Copyright (c) 2018 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 "stat.h"
#include "name.h"
namespace ots {
// -----------------------------------------------------------------------------
// OpenTypeSTAT
// -----------------------------------------------------------------------------
bool OpenTypeSTAT::ValidateNameId(uint16_t nameid) {
OpenTypeNAME* name = static_cast<OpenTypeNAME*>(
GetFont()->GetTypedTable(OTS_TAG_NAME));
if (!name || !name->IsValidNameId(nameid)) {
Drop("Invalid nameID: %d", nameid);
return false;
}
if ((nameid >= 26 && nameid <= 255) || nameid >= 32768) {
Warning("nameID out of range: %d", nameid);
return true;
}
return true;
}
bool OpenTypeSTAT::Parse(const uint8_t* data, size_t length) {
Buffer table(data, length);
if (!table.ReadU16(&this->majorVersion) ||
!table.ReadU16(&this->minorVersion) ||
!table.ReadU16(&this->designAxisSize) ||
!table.ReadU16(&this->designAxisCount) ||
!table.ReadU32(&this->designAxesOffset) ||
!table.ReadU16(&this->axisValueCount) ||
!table.ReadU32(&this->offsetToAxisValueOffsets) ||
!(this->minorVersion < 1 || table.ReadU16(&this->elidedFallbackNameID))) {
return Drop("Failed to read table header");
}
if (this->majorVersion != 1) {
return Drop("Unknown table version");
}
if (this->minorVersion > 2) {
Warning("Unknown minor version, downgrading to 2");
this->minorVersion = 2;
}
size_t headerEnd = table.offset();
if (this->designAxisCount == 0) {
if (this->designAxesOffset != 0) {
Warning("Unexpected non-zero designAxesOffset");
this->designAxesOffset = 0;
}
} else {
if (this->designAxisSize < sizeof(AxisRecord)) {
return Drop("Invalid designAxisSize");
}
if (this->designAxesOffset < headerEnd ||
size_t(this->designAxesOffset) > length ||
size_t(this->designAxisCount) * size_t(this->designAxisSize) >
length - size_t(this->designAxesOffset)) {
return Drop("Invalid designAxesOffset");
}
}
for (size_t i = 0; i < this->designAxisCount; i++) {
table.set_offset(this->designAxesOffset + i * this->designAxisSize);
this->designAxes.emplace_back();
auto& axis = this->designAxes[i];
if (!table.ReadU32(&axis.axisTag) ||
!table.ReadU16(&axis.axisNameID) ||
!table.ReadU16(&axis.axisOrdering)) {
return Drop("Failed to read design axis");
}
if (!CheckTag(axis.axisTag)) {
return Drop("Bad design axis tag");
}
if (!ValidateNameId(axis.axisNameID)) {
return true;
}
}
// TODO
// - check that all axes defined in fvar are covered by STAT
// - check that axisOrdering values are not duplicated (warn only)
if (this->axisValueCount == 0) {
if (this->offsetToAxisValueOffsets != 0) {
Warning("Unexpected non-zero offsetToAxisValueOffsets");
this->offsetToAxisValueOffsets = 0;
}
} else {
if (this->offsetToAxisValueOffsets < headerEnd ||
size_t(this->offsetToAxisValueOffsets) > length ||
size_t(this->axisValueCount) * sizeof(uint16_t) >
length - size_t(this->offsetToAxisValueOffsets)) {
return Drop("Invalid offsetToAxisValueOffsets");
}
}
for (size_t i = 0; i < this->axisValueCount; i++) {
table.set_offset(this->offsetToAxisValueOffsets + i * sizeof(uint16_t));
uint16_t axisValueOffset;
if (!table.ReadU16(&axisValueOffset)) {
return Drop("Failed to read axis value offset");
}
// We already checked that offsetToAxisValueOffsets doesn't exceed length,
// so this subtraction will not underflow.
if (axisValueOffset > length - this->offsetToAxisValueOffsets) {
return Drop("Invalid axis value offset");
}
table.set_offset(this->offsetToAxisValueOffsets + axisValueOffset);
uint16_t format;
if (!table.ReadU16(&format)) {
return Drop("Failed to read axis value format");
}
this->axisValues.emplace_back(format);
auto& axisValue = axisValues[i];
switch (format) {
case 1:
if (!table.ReadU16(&axisValue.format1.axisIndex) ||
!table.ReadU16(&axisValue.format1.flags) ||
!table.ReadU16(&axisValue.format1.valueNameID) ||
!table.ReadS32(&axisValue.format1.value)) {
return Drop("Failed to read axis value (format 1)");
}
if (axisValue.format1.axisIndex >= this->designAxisCount) {
return Drop("Axis index out of range");
}
if ((axisValue.format1.flags & 0xFFFCu) != 0) {
Warning("Unexpected axis value flags");
axisValue.format1.flags &= ~0xFFFCu;
}
if (!ValidateNameId(axisValue.format1.valueNameID)) {
return true;
}
break;
case 2:
if (!table.ReadU16(&axisValue.format2.axisIndex) ||
!table.ReadU16(&axisValue.format2.flags) ||
!table.ReadU16(&axisValue.format2.valueNameID) ||
!table.ReadS32(&axisValue.format2.nominalValue) ||
!table.ReadS32(&axisValue.format2.rangeMinValue) ||
!table.ReadS32(&axisValue.format2.rangeMaxValue)) {
return Drop("Failed to read axis value (format 2)");
}
if (axisValue.format2.axisIndex >= this->designAxisCount) {
return Drop("Axis index out of range");
}
if ((axisValue.format2.flags & 0xFFFCu) != 0) {
Warning("Unexpected axis value flags");
axisValue.format1.flags &= ~0xFFFCu;
}
if (!ValidateNameId(axisValue.format2.valueNameID)) {
return true;
}
if (!(axisValue.format2.rangeMinValue <= axisValue.format2.nominalValue &&
axisValue.format2.nominalValue <= axisValue.format2.rangeMaxValue)) {
Warning("Bad axis value range or nominal value");
}
break;
case 3:
if (!table.ReadU16(&axisValue.format3.axisIndex) ||
!table.ReadU16(&axisValue.format3.flags) ||
!table.ReadU16(&axisValue.format3.valueNameID) ||
!table.ReadS32(&axisValue.format3.value) ||
!table.ReadS32(&axisValue.format3.linkedValue)) {
return Drop("Failed to read axis value (format 3)");
}
if (axisValue.format3.axisIndex >= this->designAxisCount) {
return Drop("Axis index out of range");
}
if ((axisValue.format3.flags & 0xFFFCu) != 0) {
Warning("Unexpected axis value flags");
axisValue.format3.flags &= ~0xFFFCu;
}
if (!ValidateNameId(axisValue.format3.valueNameID)) {
return true;
}
break;
case 4:
if (this->minorVersion < 2) {
return Drop("Invalid table minorVersion for format 4 axis values: %d", this->minorVersion);
}
if (!table.ReadU16(&axisValue.format4.axisCount) ||
!table.ReadU16(&axisValue.format4.flags) ||
!table.ReadU16(&axisValue.format4.valueNameID)) {
return Drop("Failed to read axis value (format 4)");
}
if (axisValue.format4.axisCount > this->designAxisCount) {
return Drop("Axis count out of range");
}
if ((axisValue.format4.flags & 0xFFFCu) != 0) {
Warning("Unexpected axis value flags");
axisValue.format4.flags &= ~0xFFFCu;
}
if (!ValidateNameId(axisValue.format4.valueNameID)) {
return true;
}
for (unsigned j = 0; j < axisValue.format4.axisCount; j++) {
axisValue.format4.axisValues.emplace_back();
auto& v = axisValue.format4.axisValues[j];
if (!table.ReadU16(&v.axisIndex) ||
!table.ReadS32(&v.value)) {
return Drop("Failed to read axis value");
}
if (v.axisIndex >= this->designAxisCount) {
return Drop("Axis index out of range");
}
}
break;
default:
return Drop("Unknown axis value format");
}
}
return true;
}
bool OpenTypeSTAT::Serialize(OTSStream* out) {
off_t tableStart = out->Tell();
size_t headerSize = 5 * sizeof(uint16_t) + 2 * sizeof(uint32_t);
if (this->minorVersion >= 1) {
headerSize += sizeof(uint16_t);
}
if (this->designAxisCount == 0) {
this->designAxesOffset = 0;
} else {
this->designAxesOffset = headerSize;
}
this->designAxisSize = sizeof(AxisRecord);
if (this->axisValueCount == 0) {
this->offsetToAxisValueOffsets = 0;
} else {
if (this->designAxesOffset == 0) {
this->offsetToAxisValueOffsets = headerSize;
} else {
this->offsetToAxisValueOffsets = this->designAxesOffset + this->designAxisCount * this->designAxisSize;
}
}
if (!out->WriteU16(this->majorVersion) ||
!out->WriteU16(this->minorVersion) ||
!out->WriteU16(this->designAxisSize) ||
!out->WriteU16(this->designAxisCount) ||
!out->WriteU32(this->designAxesOffset) ||
!out->WriteU16(this->axisValueCount) ||
!out->WriteU32(this->offsetToAxisValueOffsets) ||
!(this->minorVersion < 1 || out->WriteU16(this->elidedFallbackNameID))) {
return Error("Failed to write table header");
}
if (this->designAxisCount > 0) {
if (out->Tell() - tableStart != this->designAxesOffset) {
return Error("Error computing designAxesOffset");
}
}
for (unsigned i = 0; i < this->designAxisCount; i++) {
const auto& axis = this->designAxes[i];
if (!out->WriteU32(axis.axisTag) ||
!out->WriteU16(axis.axisNameID) ||
!out->WriteU16(axis.axisOrdering)) {
return Error("Failed to write design axis");
}
}
if (this->axisValueCount > 0) {
if (out->Tell() - tableStart != this->offsetToAxisValueOffsets) {
return Error("Error computing offsetToAxisValueOffsets");
}
}
uint32_t axisValueOffset = this->axisValueCount * sizeof(uint16_t);
for (unsigned i = 0; i < this->axisValueCount; i++) {
const auto& value = this->axisValues[i];
if (!out->WriteU16(axisValueOffset)) {
return Error("Failed to write axis value offset");
}
axisValueOffset += value.Length();
}
for (unsigned i = 0; i < this->axisValueCount; i++) {
const auto& value = this->axisValues[i];
if (!out->WriteU16(value.format)) {
return Error("Failed to write axis value");
}
switch (value.format) {
case 1:
if (!out->WriteU16(value.format1.axisIndex) ||
!out->WriteU16(value.format1.flags) ||
!out->WriteU16(value.format1.valueNameID) ||
!out->WriteS32(value.format1.value)) {
return Error("Failed to write axis value");
}
break;
case 2:
if (!out->WriteU16(value.format2.axisIndex) ||
!out->WriteU16(value.format2.flags) ||
!out->WriteU16(value.format2.valueNameID) ||
!out->WriteS32(value.format2.nominalValue) ||
!out->WriteS32(value.format2.rangeMinValue) ||
!out->WriteS32(value.format2.rangeMaxValue)) {
return Error("Failed to write axis value");
}
break;
case 3:
if (!out->WriteU16(value.format3.axisIndex) ||
!out->WriteU16(value.format3.flags) ||
!out->WriteU16(value.format3.valueNameID) ||
!out->WriteS32(value.format3.value) ||
!out->WriteS32(value.format3.linkedValue)) {
return Error("Failed to write axis value");
}
break;
case 4:
if (!out->WriteU16(value.format4.axisCount) ||
!out->WriteU16(value.format4.flags) ||
!out->WriteU16(value.format4.valueNameID)) {
return Error("Failed to write axis value");
}
for (unsigned j = 0; j < value.format4.axisValues.size(); j++) {
if (!out->WriteU16(value.format4.axisValues[j].axisIndex) ||
!out->WriteS32(value.format4.axisValues[j].value)) {
return Error("Failed to write axis value");
}
}
break;
default:
return Error("Bad value format");
}
}
return true;
}
} // namespace ots