CCFileUtils-android.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#include "platform/CCPlatformConfig.h"
#if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID

#include "platform/android/CCFileUtils-android.h"
#include "platform/android/jni/JniHelper.h"
#include "platform/android/jni/JniImp.h"
#include "android/asset_manager.h"
#include "android/asset_manager_jni.h"
#include "base/ZipUtils.h"
#include <stdlib.h>
#include <sys/stat.h>

#define  LOG_TAG    "CCFileUtils-android.cpp"
#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)

#define  ASSETS_FOLDER_NAME          "@assets/"

#ifndef JCLS_HELPER
#define JCLS_HELPER "org/cocos2dx/lib/Cocos2dxHelper"
#endif

NS_CC_BEGIN

AAssetManager* FileUtilsAndroid::assetmanager = nullptr;
ZipFile* FileUtilsAndroid::obbfile = nullptr;

void FileUtilsAndroid::setassetmanager(AAssetManager* a) {
    if (nullptr == a) {
        LOGD("setassetmanager : received unexpected nullptr parameter");
        return;
    }

    cocos2d::FileUtilsAndroid::assetmanager = a;
}

FileUtils* FileUtils::getInstance()
{
    if (s_sharedFileUtils == nullptr)
    {
        s_sharedFileUtils = new FileUtilsAndroid();
        if (!s_sharedFileUtils->init())
        {
          delete s_sharedFileUtils;
          s_sharedFileUtils = nullptr;
          CCLOG("ERROR: Could not init CCFileUtilsAndroid");
        }
    }
    return s_sharedFileUtils;
}

FileUtilsAndroid::FileUtilsAndroid()
{
}

FileUtilsAndroid::~FileUtilsAndroid()
{
    if (obbfile)
    {
        delete obbfile;
        obbfile = nullptr;
    }
}

bool FileUtilsAndroid::init()
{
    _defaultResRootPath = ASSETS_FOLDER_NAME;
    
    std::string assetsPath(getApkPathJNI());
    if (assetsPath.find("/obb/") != std::string::npos)
    {
        obbfile = new ZipFile(assetsPath);
    }

    return FileUtils::init();
}

std::string FileUtilsAndroid::getNewFilename(const std::string &filename) const
{
    std::string newFileName = FileUtils::getNewFilename(filename);
    // ../xxx do not fix this path
    auto pos = newFileName.find("../");
    if (pos == std::string::npos || pos == 0)
    {
        return newFileName;
    }

    std::vector<std::string> v(3);
    v.resize(0);
    auto change = false;
    size_t size = newFileName.size();
    size_t idx = 0;
    bool noexit = true;
    while (noexit)
    {
        pos = newFileName.find('/', idx);
        std::string tmp;
        if (pos == std::string::npos)
        {
            tmp = newFileName.substr(idx, size - idx);
            noexit = false;
        }else
        {
            tmp = newFileName.substr(idx, pos - idx + 1);
        }
        auto t = v.size();
        if (t > 0 && v[t-1].compare("../") != 0 &&
             (tmp.compare("../") == 0 || tmp.compare("..") == 0))
        {
            v.pop_back();
            change = true;
        }else
        {
            v.push_back(tmp);
        }
        idx = pos + 1;
    }

    if (change)
    {
        newFileName.clear();
        for (auto &s : v)
        {
            newFileName.append(s);
        }
    }
    return newFileName;
}

bool FileUtilsAndroid::isFileExistInternal(const std::string& strFilePath) const
{
    if (strFilePath.empty())
    {
        return false;
    }

    bool bFound = false;

    // Check whether file exists in apk.
    if (strFilePath[0] != '/')
    {
        const char* s = strFilePath.c_str();

        // Found "@assets/" at the beginning of the path and we don't want it
        if (strFilePath.find(ASSETS_FOLDER_NAME) == 0) s += strlen(ASSETS_FOLDER_NAME);
        if (obbfile && obbfile->fileExists(s))
        {
            bFound = true;
        }
        else if (FileUtilsAndroid::assetmanager)
        {
            AAsset* aa = AAssetManager_open(FileUtilsAndroid::assetmanager, s, AASSET_MODE_UNKNOWN);
            if (aa)
            {
                bFound = true;
                AAsset_close(aa);
            } else {
                // CCLOG("[AssetManager] ... in APK %s, found = false!", strFilePath.c_str());
            }
        }
    }
    else
    {
        FILE *fp = fopen(strFilePath.c_str(), "r");
        if (fp)
        {
            bFound = true;
            fclose(fp);
        }
    }
    return bFound;
}

bool FileUtilsAndroid::isDirectoryExistInternal(const std::string& dirPath_) const
{
    if (dirPath_.empty())
    {
        return false;
    }

    std::string dirPath = dirPath_;
    if (dirPath[dirPath.length() - 1] == '/')
    {
        dirPath[dirPath.length() - 1] = '\0';
    }

    // find absolute path in flash memory
    if (dirPath[0] == '/')
    {
        CCLOG("find in flash memory dirPath(%s)", dirPath.c_str());
        struct stat st;
        if (stat(dirPath.c_str(), &st) == 0)
        {
            return S_ISDIR(st.st_mode);
        }
    }
    else
    {
        // find it in apk's assets dir
        // Found "@assets/" at the beginning of the path and we don't want it
        CCLOG("find in apk dirPath(%s)", dirPath.c_str());
        const char* s = dirPath.c_str();
        if (dirPath.find(_defaultResRootPath) == 0)
        {
            s += _defaultResRootPath.length();
        }
        if (FileUtilsAndroid::assetmanager)
        {
            AAssetDir* aa = AAssetManager_openDir(FileUtilsAndroid::assetmanager, s);
            if (aa && AAssetDir_getNextFileName(aa))
            {
                AAssetDir_close(aa);
                return true;
            }
        }
    }
    
    return false;
}

bool FileUtilsAndroid::isAbsolutePath(const std::string& strPath) const
{
    // On Android, there are two situations for full path.
    // 1) Files in APK, e.g. assets/path/path/file.png
    // 2) Files not in APK, e.g. /data/data/org.cocos2dx.hellocpp/cache/path/path/file.png, or /sdcard/path/path/file.png.
    // So these two situations need to be checked on Android.
    if (strPath[0] == '/' || strPath.find(ASSETS_FOLDER_NAME) == 0)
    {
        return true;
    }
    return false;
}

FileUtils::Status FileUtilsAndroid::getContents(const std::string& filename, ResizableBuffer* buffer)
{
    if (filename.empty())
        return FileUtils::Status::NotExists;

    std::string fullPath = fullPathForFilename(filename);
    if (fullPath.empty())
        return FileUtils::Status::NotExists;

    if (fullPath[0] == '/')
        return FileUtils::getContents(fullPath, buffer);

    std::string relativePath;
    size_t position = fullPath.find(ASSETS_FOLDER_NAME);
    if (0 == position) {
        // "@assets/" is at the beginning of the path and we don't want it
        relativePath += fullPath.substr(strlen(ASSETS_FOLDER_NAME));
    } else {
        relativePath = fullPath;
    }

    if (obbfile)
    {
        if (obbfile->getFileData(relativePath, buffer))
            return FileUtils::Status::OK;
    }

    if (nullptr == assetmanager) {
        LOGD("... FileUtilsAndroid::assetmanager is nullptr");
        return FileUtils::Status::NotInitialized;
    }

    AAsset* asset = AAssetManager_open(assetmanager, relativePath.data(), AASSET_MODE_UNKNOWN);
    if (nullptr == asset) {
        LOGD("asset (%s) is nullptr", filename.c_str());
        return FileUtils::Status::OpenFailed;
    }

    auto size = AAsset_getLength(asset);
    buffer->resize(size);

    int readsize = AAsset_read(asset, buffer->buffer(), size);
    AAsset_close(asset);

    if (readsize < size) {
        if (readsize >= 0)
            buffer->resize(readsize);
        return FileUtils::Status::ReadFailed;
    }

    return FileUtils::Status::OK;
}

std::string FileUtilsAndroid::getWritablePath() const
{
    // Fix for Nexus 10 (Android 4.2 multi-user environment)
    // the path is retrieved through Java Context.getCacheDir() method
    std::string dir("");
    std::string tmp = JniHelper::callStaticStringMethod(JCLS_HELPER, "getWritablePath");

    if (tmp.length() > 0)
    {
        dir.append(tmp).append("/");

        return dir;
    }
    else
    {
        return "";
    }
}

NS_CC_END

#endif // CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID