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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 "maxp.h"
// maxp - Maximum Profile
// http://www.microsoft.com/typography/otspec/maxp.htm
namespace ots {
bool OpenTypeMAXP::Parse(const uint8_t *data, size_t length) {
Buffer table(data, length);
uint32_t version = 0;
if (!table.ReadU32(&version)) {
return Error("Failed to read table version");
}
if (version >> 16 > 1) {
return Error("Unsupported table version 0x%x", version);
}
if (!table.ReadU16(&this->num_glyphs)) {
return Error("Failed to read numGlyphs");
}
if (!this->num_glyphs) {
return Error("numGlyphs is 0");
}
this->version_1 = false;
// Per https://learn.microsoft.com/en-gb/typography/opentype/spec/maxp,
// the only two 'maxp' version numbers are 0.5 (for CFF/CFF2) and 1.0
// (for TrueType).
// If it's version 0.5, there is nothing more to read.
if (version == 0x00005000) {
return true;
}
if (version != 0x00010000) {
Warning("Unexpected version 0x%08x; attempting to read as version 1.0",
version);
}
// Otherwise, try to read the version 1.0 fields:
if (!table.ReadU16(&this->max_points) ||
!table.ReadU16(&this->max_contours) ||
!table.ReadU16(&this->max_c_points) ||
!table.ReadU16(&this->max_c_contours) ||
!table.ReadU16(&this->max_zones) ||
!table.ReadU16(&this->max_t_points) ||
!table.ReadU16(&this->max_storage) ||
!table.ReadU16(&this->max_fdefs) ||
!table.ReadU16(&this->max_idefs) ||
!table.ReadU16(&this->max_stack) ||
!table.ReadU16(&this->max_size_glyf_instructions) ||
!table.ReadU16(&this->max_c_components) ||
!table.ReadU16(&this->max_c_depth)) {
Warning("Failed to read version 1.0 fields, downgrading to version 0.5");
return true;
}
this->version_1 = true;
if (this->max_zones < 1) {
// workaround for ipa*.ttf Japanese fonts.
Warning("Bad maxZones: %u", this->max_zones);
this->max_zones = 1;
} else if (this->max_zones > 2) {
// workaround for Ecolier-*.ttf fonts and bad fonts in some PDFs
Warning("Bad maxZones: %u", this->max_zones);
this->max_zones = 2;
}
return true;
}
bool OpenTypeMAXP::Serialize(OTSStream *out) {
if (!out->WriteU32(this->version_1 ? 0x00010000 : 0x00005000) ||
!out->WriteU16(this->num_glyphs)) {
return Error("Failed to write version or numGlyphs");
}
if (!this->version_1) return true;
if (!out->WriteU16(this->max_points) ||
!out->WriteU16(this->max_contours) ||
!out->WriteU16(this->max_c_points) ||
!out->WriteU16(this->max_c_contours)) {
return Error("Failed to write maxp");
}
if (!out->WriteU16(this->max_zones) ||
!out->WriteU16(this->max_t_points) ||
!out->WriteU16(this->max_storage) ||
!out->WriteU16(this->max_fdefs) ||
!out->WriteU16(this->max_idefs) ||
!out->WriteU16(this->max_stack) ||
!out->WriteU16(this->max_size_glyf_instructions)) {
return Error("Failed to write more maxp");
}
if (!out->WriteU16(this->max_c_components) ||
!out->WriteU16(this->max_c_depth)) {
return Error("Failed to write yet more maxp");
}
return true;
}
} // namespace ots
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