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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <jni.h>
#include <android/system_fonts.h>
#include <memory>
#include <string>
#include <vector>
#include <errno.h>
#include <fcntl.h>
#include <libxml/tree.h>
#include <log/log.h>
#include <sys/stat.h>
#include <unistd.h>
struct XmlCharDeleter {
void operator()(xmlChar* b) { xmlFree(b); }
};
struct XmlDocDeleter {
void operator()(xmlDoc* d) { xmlFreeDoc(d); }
};
using XmlCharUniquePtr = std::unique_ptr<xmlChar, XmlCharDeleter>;
using XmlDocUniquePtr = std::unique_ptr<xmlDoc, XmlDocDeleter>;
struct ASystemFontIterator {
XmlDocUniquePtr mXmlDoc;
xmlNode* mFontNode;
};
struct ASystemFont {
std::string mFilePath;
std::unique_ptr<std::string> mLocale;
uint16_t mWeight;
bool mItalic;
uint32_t mCollectionIndex;
std::vector<std::pair<uint32_t, float>> mAxes;
};
namespace {
std::string xmlTrim(const std::string& in) {
if (in.empty()) {
return in;
}
const char XML_SPACES[] = "\u0020\u000D\u000A\u0009";
const size_t start = in.find_first_not_of(XML_SPACES); // inclusive
if (start == std::string::npos) {
return "";
}
const size_t end = in.find_last_not_of(XML_SPACES); // inclusive
if (end == std::string::npos) {
return "";
}
return in.substr(start, end - start + 1 /* +1 since end is inclusive */);
}
const xmlChar* FAMILY_TAG = BAD_CAST("family");
const xmlChar* FONT_TAG = BAD_CAST("font");
xmlNode* firstElement(xmlNode* node, const xmlChar* tag) {
for (xmlNode* child = node->children; child; child = child->next) {
if (xmlStrEqual(child->name, tag)) {
return child;
}
}
return nullptr;
}
xmlNode* nextSibling(xmlNode* node, const xmlChar* tag) {
while ((node = node->next) != nullptr) {
if (xmlStrEqual(node->name, tag)) {
return node;
}
}
return nullptr;
}
void copyFont(ASystemFontIterator* ite, ASystemFont* out) {
const xmlChar* LOCALE_ATTR_NAME = BAD_CAST("lang");
XmlCharUniquePtr filePathStr(
xmlNodeListGetString(ite->mXmlDoc.get(), ite->mFontNode->xmlChildrenNode, 1));
out->mFilePath = "/system/fonts/" + xmlTrim(
std::string(filePathStr.get(), filePathStr.get() + xmlStrlen(filePathStr.get())));
const xmlChar* WEIGHT_ATTR_NAME = BAD_CAST("weight");
XmlCharUniquePtr weightStr(xmlGetProp(ite->mFontNode, WEIGHT_ATTR_NAME));
out->mWeight = weightStr ?
strtol(reinterpret_cast<const char*>(weightStr.get()), nullptr, 10) : 400;
const xmlChar* STYLE_ATTR_NAME = BAD_CAST("style");
const xmlChar* ITALIC_ATTR_VALUE = BAD_CAST("italic");
XmlCharUniquePtr styleStr(xmlGetProp(ite->mFontNode, STYLE_ATTR_NAME));
out->mItalic = styleStr ? xmlStrEqual(styleStr.get(), ITALIC_ATTR_VALUE) : false;
const xmlChar* INDEX_ATTR_NAME = BAD_CAST("index");
XmlCharUniquePtr indexStr(xmlGetProp(ite->mFontNode, INDEX_ATTR_NAME));
out->mCollectionIndex = indexStr ?
strtol(reinterpret_cast<const char*>(indexStr.get()), nullptr, 10) : 0;
XmlCharUniquePtr localeStr(xmlGetProp(ite->mXmlDoc->parent, LOCALE_ATTR_NAME));
out->mLocale.reset(
localeStr ? new std::string(reinterpret_cast<const char*>(localeStr.get())) : nullptr);
const xmlChar* TAG_ATTR_NAME = BAD_CAST("tag");
const xmlChar* STYLEVALUE_ATTR_NAME = BAD_CAST("stylevalue");
const xmlChar* AXIS_TAG = BAD_CAST("axis");
out->mAxes.clear();
for (xmlNode* axis = firstElement(ite->mFontNode, AXIS_TAG); axis;
axis = nextSibling(axis, AXIS_TAG)) {
XmlCharUniquePtr tagStr(xmlGetProp(axis, TAG_ATTR_NAME));
if (!tagStr || xmlStrlen(tagStr.get()) != 4) {
continue; // Tag value must be 4 char string
}
XmlCharUniquePtr styleValueStr(xmlGetProp(axis, STYLEVALUE_ATTR_NAME));
if (!styleValueStr) {
continue;
}
uint32_t tag =
static_cast<uint32_t>(tagStr.get()[0] << 24) |
static_cast<uint32_t>(tagStr.get()[1] << 16) |
static_cast<uint32_t>(tagStr.get()[2] << 8) |
static_cast<uint32_t>(tagStr.get()[3]);
float styleValue = strtod(reinterpret_cast<const char*>(styleValueStr.get()), nullptr);
out->mAxes.push_back(std::make_pair(tag, styleValue));
}
}
bool isFontFileAvailable(const std::string& filePath) {
std::string fullPath = filePath;
struct stat st = {};
if (stat(fullPath.c_str(), &st) != 0) {
return false;
}
return S_ISREG(st.st_mode);
}
xmlNode* findFirstFontNode(xmlDoc* doc) {
xmlNode* familySet = xmlDocGetRootElement(doc);
if (familySet == nullptr) {
return nullptr;
}
xmlNode* family = firstElement(familySet, FAMILY_TAG);
if (family == nullptr) {
return nullptr;
}
xmlNode* font = firstElement(family, FONT_TAG);
while (font == nullptr) {
family = nextSibling(family, FAMILY_TAG);
if (family == nullptr) {
return nullptr;
}
font = firstElement(family, FONT_TAG);
}
return font;
}
} // namespace
ASystemFontIterator* ASystemFontIterator_open() {
std::unique_ptr<ASystemFontIterator> ite(new ASystemFontIterator());
ite->mXmlDoc.reset(xmlReadFile("/system/etc/fonts.xml", nullptr, 0));
return ite.release();
}
void ASystemFontIterator_close(ASystemFontIterator* ite) {
delete ite;
}
ASystemFont* ASystemFontIterator_next(ASystemFontIterator* ite) {
LOG_ALWAYS_FATAL_IF(ite == nullptr, "nullptr has passed as iterator argument");
if (ite->mFontNode == nullptr) {
if (ite->mXmlDoc == nullptr) {
return nullptr; // Already at the end.
} else {
// First time to query font.
ite->mFontNode = findFirstFontNode(ite->mXmlDoc.get());
if (ite->mFontNode == nullptr) {
ite->mXmlDoc.reset();
return nullptr; // No font node found.
}
std::unique_ptr<ASystemFont> font = std::make_unique<ASystemFont>();
copyFont(ite, font.get());
return font.release();
}
} else {
xmlNode* nextNode = nextSibling(ite->mFontNode, FONT_TAG);
while (nextNode == nullptr) {
xmlNode* family = nextSibling(ite->mFontNode->parent, FAMILY_TAG);
if (family == nullptr) {
break;
}
nextNode = firstElement(family, FONT_TAG);
}
ite->mFontNode = nextNode;
if (nextNode == nullptr) {
ite->mXmlDoc.reset();
return nullptr;
}
std::unique_ptr<ASystemFont> font = std::make_unique<ASystemFont>();
copyFont(ite, font.get());
if (!isFontFileAvailable(font->mFilePath)) {
// fonts.xml intentionally contains missing font configuration. Skip it.
return ASystemFontIterator_next(ite);
}
return font.release();
}
}
void ASystemFont_close(ASystemFont* font) {
delete font;
}
const char* ASystemFont_getFontFilePath(const ASystemFont* font) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
return font->mFilePath.c_str();
}
uint16_t ASystemFont_getWeight(const ASystemFont* font) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
return font->mWeight;
}
bool ASystemFont_isItalic(const ASystemFont* font) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed as font argument");
return font->mItalic;
}
const char* ASystemFont_getLocale(const ASystemFont* font) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
return font->mLocale ? nullptr : font->mLocale->c_str();
}
size_t ASystemFont_getCollectionIndex(const ASystemFont* font) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
return font->mCollectionIndex;
}
size_t ASystemFont_getAxisCount(const ASystemFont* font) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
return font->mAxes.size();
}
uint32_t ASystemFont_getAxisTag(const ASystemFont* font, uint32_t axisIndex) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
LOG_ALWAYS_FATAL_IF(axisIndex >= font->mAxes.size(),
"given axis index is out of bounds. (< %zd", font->mAxes.size());
return font->mAxes[axisIndex].first;
}
float ASystemFont_getAxisValue(const ASystemFont* font, uint32_t axisIndex) {
LOG_ALWAYS_FATAL_IF(font == nullptr, "nullptr has passed to font argument");
LOG_ALWAYS_FATAL_IF(axisIndex >= font->mAxes.size(),
"given axis index is out of bounds. (< %zd", font->mAxes.size());
return font->mAxes[axisIndex].second;
}