blob: e55be75371a686d4c60681b53aef1a2dbb355e97 [file] [log] [blame]
// Copyright (c) 2011 The Chromium 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 "name.h"
#include <algorithm>
#include <cstring>
// name - Naming Table
// http://www.microsoft.com/typography/otspec/name.htm
#define TABLE_NAME "name"
namespace {
bool ValidInPsName(char c) {
return (c > 0x20 && c < 0x7f && !std::strchr("[](){}<>/%", c));
}
bool CheckPsNameAscii(const std::string& name) {
for (unsigned i = 0; i < name.size(); ++i) {
if (!ValidInPsName(name[i])) {
return false;
}
}
return true;
}
bool CheckPsNameUtf16Be(const std::string& name) {
if ((name.size() & 1) != 0)
return false;
for (unsigned i = 0; i < name.size(); i += 2) {
if (name[i] != 0) {
return false;
}
if (!ValidInPsName(name[i+1])) {
return false;
}
}
return true;
}
void AssignToUtf16BeFromAscii(std::string* target,
const std::string& source) {
target->resize(source.size() * 2);
for (unsigned i = 0, j = 0; i < source.size(); i++) {
(*target)[j++] = '\0';
(*target)[j++] = source[i];
}
}
} // namespace
namespace ots {
bool ots_name_parse(Font *font, const uint8_t* data, size_t length) {
Buffer table(data, length);
OpenTypeNAME* name = new OpenTypeNAME;
font->name = name;
uint16_t format = 0;
if (!table.ReadU16(&format) || format > 1) {
return OTS_FAILURE_MSG("Failed to read name table format or bad format %d", format);
}
uint16_t count = 0;
if (!table.ReadU16(&count)) {
return OTS_FAILURE_MSG("Failed to read name count");
}
uint16_t string_offset = 0;
if (!table.ReadU16(&string_offset) || string_offset > length) {
return OTS_FAILURE_MSG("Failed to read strings offset");
}
const char* string_base = reinterpret_cast<const char*>(data) +
string_offset;
bool sort_required = false;
// Read all the names, discarding any with invalid IDs,
// and any where the offset/length would be outside the table.
// A stricter alternative would be to reject the font if there
// are invalid name records, but it's not clear that is necessary.
for (unsigned i = 0; i < count; ++i) {
NameRecord rec;
uint16_t name_length, name_offset = 0;
if (!table.ReadU16(&rec.platform_id) ||
!table.ReadU16(&rec.encoding_id) ||
!table.ReadU16(&rec.language_id) ||
!table.ReadU16(&rec.name_id) ||
!table.ReadU16(&name_length) ||
!table.ReadU16(&name_offset)) {
return OTS_FAILURE_MSG("Failed to read name entry %d", i);
}
// check platform & encoding, discard names with unknown values
switch (rec.platform_id) {
case 0: // Unicode
if (rec.encoding_id > 6) {
continue;
}
break;
case 1: // Macintosh
if (rec.encoding_id > 32) {
continue;
}
break;
case 2: // ISO
if (rec.encoding_id > 2) {
continue;
}
break;
case 3: // Windows: IDs 7 to 9 are "reserved"
if (rec.encoding_id > 6 && rec.encoding_id != 10) {
continue;
}
break;
case 4: // Custom (OTF Windows NT compatibility)
if (rec.encoding_id > 255) {
continue;
}
break;
default: // unknown platform
continue;
}
const unsigned name_end = static_cast<unsigned>(string_offset) +
name_offset + name_length;
if (name_end > length) {
continue;
}
rec.text.resize(name_length);
rec.text.assign(string_base + name_offset, name_length);
if (rec.name_id == 6) {
// PostScript name: check that it is valid, if not then discard it
if (rec.platform_id == 1) {
if (!CheckPsNameAscii(rec.text)) {
continue;
}
} else if (rec.platform_id == 0 || rec.platform_id == 3) {
if (!CheckPsNameUtf16Be(rec.text)) {
continue;
}
}
}
if (!name->names.empty() && !(name->names.back() < rec)) {
OTS_WARNING("name records are not sorted.");
sort_required = true;
}
name->names.push_back(rec);
}
if (format == 1) {
// extended name table format with language tags
uint16_t lang_tag_count;
if (!table.ReadU16(&lang_tag_count)) {
return OTS_FAILURE_MSG("Failed to read language tag count");
}
for (unsigned i = 0; i < lang_tag_count; ++i) {
uint16_t tag_length = 0;
uint16_t tag_offset = 0;
if (!table.ReadU16(&tag_length) || !table.ReadU16(&tag_offset)) {
return OTS_FAILURE_MSG("Faile to read tag length or offset");
}
const unsigned tag_end = static_cast<unsigned>(string_offset) +
tag_offset + tag_length;
if (tag_end > length) {
return OTS_FAILURE_MSG("bad end of tag %d > %ld for name entry %d", tag_end, length, i);
}
std::string tag(string_base + tag_offset, tag_length);
name->lang_tags.push_back(tag);
}
}
if (table.offset() > string_offset) {
// the string storage apparently overlapped the name/tag records;
// consider this font to be badly broken
return OTS_FAILURE_MSG("Bad table offset %ld > %d", table.offset(), string_offset);
}
// check existence of required name strings (synthesize if necessary)
// [0 - copyright - skip]
// 1 - family
// 2 - subfamily
// [3 - unique ID - skip]
// 4 - full name
// 5 - version
// 6 - postscript name
static const uint16_t kStdNameCount = 7;
static const char* kStdNames[kStdNameCount] = {
NULL,
"OTS derived font",
"Unspecified",
NULL,
"OTS derived font",
"1.000",
"OTS-derived-font"
};
// scan the names to check whether the required "standard" ones are present;
// if not, we'll add our fixed versions here
bool mac_name[kStdNameCount] = { 0 };
bool win_name[kStdNameCount] = { 0 };
for (std::vector<NameRecord>::iterator name_iter = name->names.begin();
name_iter != name->names.end(); ++name_iter) {
const uint16_t id = name_iter->name_id;
if (id >= kStdNameCount || kStdNames[id] == NULL) {
continue;
}
if (name_iter->platform_id == 1) {
mac_name[id] = true;
continue;
}
if (name_iter->platform_id == 3) {
win_name[id] = true;
continue;
}
}
for (uint16_t i = 0; i < kStdNameCount; ++i) {
if (kStdNames[i] == NULL) {
continue;
}
if (!mac_name[i] && !win_name[i]) {
NameRecord mac_rec(1 /* platform_id */, 0 /* encoding_id */,
0 /* language_id */ , i /* name_id */);
mac_rec.text.assign(kStdNames[i]);
NameRecord win_rec(3 /* platform_id */, 1 /* encoding_id */,
1033 /* language_id */ , i /* name_id */);
AssignToUtf16BeFromAscii(&win_rec.text, std::string(kStdNames[i]));
name->names.push_back(mac_rec);
name->names.push_back(win_rec);
sort_required = true;
}
}
if (sort_required) {
std::sort(name->names.begin(), name->names.end());
}
return true;
}
bool ots_name_should_serialise(Font *font) {
return font->name != NULL;
}
bool ots_name_serialise(OTSStream* out, Font *font) {
const OpenTypeNAME* name = font->name;
uint16_t name_count = static_cast<uint16_t>(name->names.size());
uint16_t lang_tag_count = static_cast<uint16_t>(name->lang_tags.size());
uint16_t format = 0;
size_t string_offset = 6 + name_count * 12;
if (name->lang_tags.size() > 0) {
// lang tags require a format-1 name table
format = 1;
string_offset += 2 + lang_tag_count * 4;
}
if (string_offset > 0xffff) {
return OTS_FAILURE_MSG("Bad string offset %ld", string_offset);
}
if (!out->WriteU16(format) ||
!out->WriteU16(name_count) ||
!out->WriteU16(static_cast<uint16_t>(string_offset))) {
return OTS_FAILURE_MSG("Failed to write name header");
}
std::string string_data;
for (std::vector<NameRecord>::const_iterator name_iter = name->names.begin();
name_iter != name->names.end(); ++name_iter) {
const NameRecord& rec = *name_iter;
if (string_data.size() + rec.text.size() >
std::numeric_limits<uint16_t>::max() ||
!out->WriteU16(rec.platform_id) ||
!out->WriteU16(rec.encoding_id) ||
!out->WriteU16(rec.language_id) ||
!out->WriteU16(rec.name_id) ||
!out->WriteU16(static_cast<uint16_t>(rec.text.size())) ||
!out->WriteU16(static_cast<uint16_t>(string_data.size())) ) {
return OTS_FAILURE_MSG("Faile to write name entry");
}
string_data.append(rec.text);
}
if (format == 1) {
if (!out->WriteU16(lang_tag_count)) {
return OTS_FAILURE_MSG("Faile to write language tag count");
}
for (std::vector<std::string>::const_iterator tag_iter =
name->lang_tags.begin();
tag_iter != name->lang_tags.end(); ++tag_iter) {
if (string_data.size() + tag_iter->size() >
std::numeric_limits<uint16_t>::max() ||
!out->WriteU16(static_cast<uint16_t>(tag_iter->size())) ||
!out->WriteU16(static_cast<uint16_t>(string_data.size()))) {
return OTS_FAILURE_MSG("Failed to write string");
}
string_data.append(*tag_iter);
}
}
if (!out->Write(string_data.data(), string_data.size())) {
return OTS_FAILURE_MSG("Faile to write string data");
}
return true;
}
void ots_name_reuse(Font *font, Font *other) {
font->name = other->name;
font->name_reused = true;
}
void ots_name_free(Font *font) {
delete font->name;
}
} // namespace
#undef TABLE_NAME