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Diffstat (limited to 'gfx/ots/src/stat.cc')
| -rw-r--r-- | gfx/ots/src/stat.cc | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/gfx/ots/src/stat.cc b/gfx/ots/src/stat.cc new file mode 100644 index 000000000..9b7828109 --- /dev/null +++ b/gfx/ots/src/stat.cc @@ -0,0 +1,347 @@ +// 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, bool allowPredefined) { + OpenTypeNAME* name = static_cast<OpenTypeNAME*>( + GetFont()->GetTypedTable(OTS_TAG_NAME)); + + if (!name || !name->IsValidNameId(nameid)) { + Drop("Invalid nameID: %d", nameid); + return false; + } + + if (!allowPredefined && nameid < 26) { + Warning("nameID out of range: %d", nameid); + return true; + } + + 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; + } + + if (this->designAxisSize < sizeof(AxisRecord)) { + return Drop("Invalid designAxisSize"); + } + + size_t headerEnd = table.offset(); + + if (this->designAxisCount == 0) { + if (this->designAxesOffset != 0) { + Warning("Unexpected non-zero designAxesOffset"); + this->designAxesOffset = 0; + } + } else { + if (this->designAxesOffset < headerEnd || + size_t(this->designAxesOffset) + + size_t(this->designAxisCount) * size_t(this->designAxisSize) > length) { + 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, false)) { + 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) + + size_t(this->axisValueCount) * sizeof(uint16_t) > length) { + 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"); + } + if (this->offsetToAxisValueOffsets + axisValueOffset > length) { + 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) { + Warning("Invalid table version for format 4 axis values - updating"); + this->minorVersion = 2; + } + 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 |