Remove old and unused Android font host code

src/ports/FontHostConfiguration_android.cpp

-/*
- * Copyright 2011 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "FontHostConfiguration_android.h"
-#include "SkString.h"
-#include "SkTDArray.h"
-#include <expat.h>
-#include <sys/system_properties.h>
-
-#define SYSTEM_FONTS_FILE "/system/etc/system_fonts.xml"
-#define FALLBACK_FONTS_FILE "/system/etc/fallback_fonts.xml"
-#define VENDOR_FONTS_FILE "/vendor/etc/fallback_fonts.xml"
-
-
-// These defines are used to determine the kind of tag that we're currently
-// populating with data. We only care about the sibling tags nameset and fileset
-// for now.
-#define NO_TAG 0
-#define NAMESET_TAG 1
-#define FILESET_TAG 2
-
-/**
- * The FamilyData structure is passed around by the parser so that each handler
- * can read these variables that are relevant to the current parsing.
- */
-struct FamilyData {
-    FamilyData(XML_Parser *parserRef, SkTDArray<FontFamily*> &familiesRef, const AndroidLocale &localeRef) :
-            parser(parserRef), families(familiesRef), currentTag(NO_TAG),
-            locale(localeRef), currentFamilyLangMatch(false), familyLangMatchCount(0) {}
-
-    XML_Parser *parser;                // The expat parser doing the work
-    SkTDArray<FontFamily*> &families;  // The array that each family is put into as it is parsed
-    FontFamily *currentFamily;         // The current family being created
-    int currentTag;                    // A flag to indicate whether we're in nameset/fileset tags
-    const AndroidLocale &locale;       // The locale to which we compare the "lang" attribute of File.
-    bool currentFamilyLangMatch;       // If currentFamily's File has a "lang" attribute and matches locale.
-    int familyLangMatchCount;          // Number of families containing File which has a "lang" attribute and matches locale.
-};
-
-/**
- * Handler for arbitrary text. This is used to parse the text inside each name
- * or file tag. The resulting strings are put into the fNames or fFileNames arrays.
- */
-void textHandler(void *data, const char *s, int len) {
-    FamilyData *familyData = (FamilyData*) data;
-    // Make sure we're in the right state to store this name information
-    if (familyData->currentFamily &&
-            (familyData->currentTag == NAMESET_TAG || familyData->currentTag == FILESET_TAG)) {
-        // Malloc new buffer to store the string
-        char *buff;
-        buff = (char*) malloc((len + 1) * sizeof(char));
-        strncpy(buff, s, len);
-        buff[len] = '\0';
-        switch (familyData->currentTag) {
-        case NAMESET_TAG:
-            *(familyData->currentFamily->fNames.append()) = buff;
-            break;
-        case FILESET_TAG:
-            *(familyData->currentFamily->fFileNames.append()) = buff;
-            break;
-        default:
-            // Noop - don't care about any text that's not in the Fonts or Names list
-            break;
-        }
-    }
-}
-
-/**
- * Handler for the start of a tag. The only tags we expect are family, nameset,
- * fileset, name, and file.
- */
-void startElementHandler(void *data, const char *tag, const char **atts) {
-    FamilyData *familyData = (FamilyData*) data;
-    int len = strlen(tag);
-    if (strncmp(tag, "family", len)== 0) {
-        familyData->currentFamily = new FontFamily();
-        familyData->currentFamily->order = -1;
-        // The Family tag has an optional "order" attribute with an integer value >= 0
-        // If this attribute does not exist, the default value is -1
-        for (int i = 0; atts[i] != NULL; i += 2) {
-            const char* valueString = atts[i+1];
-            int value;
-            int len = sscanf(valueString, "%d", &value);
-            if (len > 0) {
-                familyData->currentFamily->order = value;
-            }
-        }
-    } else if (len == 7 && strncmp(tag, "nameset", len)== 0) {
-        familyData->currentTag = NAMESET_TAG;
-    } else if (len == 7 && strncmp(tag, "fileset", len) == 0) {
-        familyData->currentTag = FILESET_TAG;
-    } else if (strncmp(tag, "name", len) == 0 && familyData->currentTag == NAMESET_TAG) {
-        XML_SetCharacterDataHandler(*familyData->parser, textHandler);
-    } else if (strncmp(tag, "file", len) == 0 && familyData->currentTag == FILESET_TAG) {
-        // From JB MR1, the File tag has a "lang" attribute to specify a language specific font file
-        // and the family entry has higher priority than the others without "lang" attribute.
-        bool includeTheEntry = true;
-        for (int i = 0; atts[i] != NULL; i += 2) {
-            const char* attribute = atts[i];
-            const char* value = atts[i+1];
-            if (strncmp(attribute, "lang", 4) == 0) {
-                if (strcmp(value, familyData->locale.language) == 0) {
-                    // Found matching "lang" attribute. The current Family will have higher priority in the family list.
-                    familyData->currentFamilyLangMatch = true;
-                } else {
-                    // Don't include the entry if "lang" is specified but not matching.
-                    includeTheEntry = false;
-                }
-            }
-        }
-        if (includeTheEntry) {
-            XML_SetCharacterDataHandler(*familyData->parser, textHandler);
-        }
-    }
-}
-
-/**
- * Handler for the end of tags. We only care about family, nameset, fileset,
- * name, and file.
- */
-void endElementHandler(void *data, const char *tag) {
-    FamilyData *familyData = (FamilyData*) data;
-    int len = strlen(tag);
-    if (strncmp(tag, "family", len)== 0) {
-        // Done parsing a Family - store the created currentFamily in the families array
-        if (familyData->currentFamilyLangMatch) {
-            *familyData->families.insert(familyData->familyLangMatchCount++) = familyData->currentFamily;
-            familyData->currentFamilyLangMatch = false;
-        } else {
-            *familyData->families.append() = familyData->currentFamily;
-        }
-        familyData->currentFamily = NULL;
-    } else if (len == 7 && strncmp(tag, "nameset", len)== 0) {
-        familyData->currentTag = NO_TAG;
-    } else if (len == 7 && strncmp(tag, "fileset", len)== 0) {
-        familyData->currentTag = NO_TAG;
-    } else if ((strncmp(tag, "name", len) == 0 && familyData->currentTag == NAMESET_TAG) ||
-            (strncmp(tag, "file", len) == 0 && familyData->currentTag == FILESET_TAG)) {
-        // Disable the arbitrary text handler installed to load Name data
-        XML_SetCharacterDataHandler(*familyData->parser, NULL);
-    }
-}
-
-/**
- * Read the persistent locale.
- */
-void getLocale(AndroidLocale &locale)
-{
-    char propLang[PROP_VALUE_MAX], propRegn[PROP_VALUE_MAX];
-    __system_property_get("persist.sys.language", propLang);
-    __system_property_get("persist.sys.country", propRegn);
-
-    if (*propLang == 0 && *propRegn == 0) {
-        /* Set to ro properties, default is en_US */
-        __system_property_get("ro.product.locale.language", propLang);
-        __system_property_get("ro.product.locale.region", propRegn);
-        if (*propLang == 0 && *propRegn == 0) {
-            strcpy(propLang, "en");
-            strcpy(propRegn, "US");
-        }
-    }
-    strncpy(locale.language, propLang, 2);
-    locale.language[2] = '\0';
-    strncpy(locale.region, propRegn, 2);
-    locale.region[2] = '\0';
-}
-
-/**
- * Use the current system locale (language and region) to open the best matching
- * customization. For example, when the language is Japanese, the sequence might be:
- *      /system/etc/fallback_fonts-ja-JP.xml
- *      /system/etc/fallback_fonts-ja.xml
- *      /system/etc/fallback_fonts.xml
- */
-FILE* openLocalizedFile(const char* origname, const AndroidLocale& locale) {
-    FILE* file = 0;
-    SkString basename;
-    SkString filename;
-
-    basename.set(origname);
-    // Remove the .xml suffix. We'll add it back in a moment.
-    if (basename.endsWith(".xml")) {
-        basename.resize(basename.size()-4);
-    }
-    // Try first with language and region
-    filename.printf("%s-%s-%s.xml", basename.c_str(), locale.language, locale.region);
-    file = fopen(filename.c_str(), "r");
-    if (!file) {
-        // If not found, try next with just language
-        filename.printf("%s-%s.xml", basename.c_str(), locale.language);
-        file = fopen(filename.c_str(), "r");
-
-        if (!file) {
-            // If still not found, try just the original name
-            file = fopen(origname, "r");
-        }
-    }
-    return file;
-}
-
-/**
- * This function parses the given filename and stores the results in the given
- * families array.
- */
-void parseConfigFile(const char *filename, SkTDArray<FontFamily*> &families) {
-    AndroidLocale locale;
-    getLocale(locale);
-    XML_Parser parser = XML_ParserCreate(NULL);
-    FamilyData familyData(&parser, families, locale);
-    XML_SetUserData(parser, &familyData);
-    XML_SetElementHandler(parser, startElementHandler, endElementHandler);
-    FILE *file = openLocalizedFile(filename, locale);
-    // Some of the files we attempt to parse (in particular, /vendor/etc/fallback_fonts.xml)
-    // are optional - failure here is okay because one of these optional files may not exist.
-    if (file == NULL) {
-        return;
-    }
-    char buffer[512];
-    bool done = false;
-    while (!done) {
-        fgets(buffer, sizeof(buffer), file);
-        int len = strlen(buffer);
-        if (feof(file) != 0) {
-            done = true;
-        }
-        XML_Parse(parser, buffer, len, done);
-    }
-    fclose(file);
-    XML_ParserFree(parser);
-}
-
-void getSystemFontFamilies(SkTDArray<FontFamily*> &fontFamilies) {
-    parseConfigFile(SYSTEM_FONTS_FILE, fontFamilies);
-}
-
-void getFallbackFontFamilies(SkTDArray<FontFamily*> &fallbackFonts) {
-    SkTDArray<FontFamily*> vendorFonts;
-    parseConfigFile(FALLBACK_FONTS_FILE, fallbackFonts);
-    parseConfigFile(VENDOR_FONTS_FILE, vendorFonts);
-
-    // This loop inserts the vendor fallback fonts in the correct order in the
-    // overall fallbacks list.
-    int currentOrder = -1;
-    for (int i = 0; i < vendorFonts.count(); ++i) {
-        FontFamily* family = vendorFonts[i];
-        int order = family->order;
-        if (order < 0) {
-            if (currentOrder < 0) {
-                // Default case - just add it to the end of the fallback list
-                *fallbackFonts.append() = family;
-            } else {
-                // no order specified on this font, but we're incrementing the order
-                // based on an earlier order insertion request
-                *fallbackFonts.insert(currentOrder++) = family;
-            }
-        } else {
-            // Add the font into the fallback list in the specified order. Set
-            // currentOrder for correct placement of other fonts in the vendor list.
-            *fallbackFonts.insert(order) = family;
-            currentOrder = order + 1;
-        }
-    }
-}
-
-/**
- * Loads data on font families from various expected configuration files. The
- * resulting data is returned in the given fontFamilies array.
- */
-void getFontFamilies(SkTDArray<FontFamily*> &fontFamilies) {
-    SkTDArray<FontFamily*> fallbackFonts;
-
-    getSystemFontFamilies(fontFamilies);
-    getFallbackFontFamilies(fallbackFonts);
-
-    // Append all fallback fonts to system fonts
-    for (int i = 0; i < fallbackFonts.count(); ++i) {
-        *fontFamilies.append() = fallbackFonts[i];
-    }
-}
-
-void getTestFontFamilies(SkTDArray<FontFamily*> &fontFamilies,
-                         const char* testMainConfigFile,
-                         const char* testFallbackConfigFile) {
-    parseConfigFile(testMainConfigFile, fontFamilies);
-
-    SkTDArray<FontFamily*> fallbackFonts;
-    parseConfigFile(testFallbackConfigFile, fallbackFonts);
-
-    // Append all fallback fonts to system fonts
-    for (int i = 0; i < fallbackFonts.count(); ++i) {
-        *fontFamilies.append() = fallbackFonts[i];
-    }
-}