axmol/cocos/platform/android/CCFileUtils-android.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

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

#include "CCFileUtils-android.h"
#include "platform/CCCommon.h"
#include "jni/Java_org_cocos2dx_lib_Cocos2dxHelper.h"
#include "android/asset_manager.h"
#include "android/asset_manager_jni.h"

#include <stdlib.h>

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

using namespace std;

NS_CC_BEGIN

AAssetManager* FileUtilsAndroid::assetmanager = 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()
{
}

bool FileUtilsAndroid::init()
{
    _defaultResRootPath = "assets/";
    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(_defaultResRootPath) == 0) s += strlen("assets/");

        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::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(_defaultResRootPath) == 0)
    {
        return true;
    }
    return false;
}

Data FileUtilsAndroid::getData(const std::string& filename, bool forString)
{
    if (filename.empty())
    {
        return Data::Null;
    }
    
    unsigned char* data = nullptr;
    ssize_t size = 0;
    string fullPath = fullPathForFilename(filename);
    
    if (fullPath[0] != '/')
    {
        string relativePath = string();

        size_t position = fullPath.find("assets/");
        if (0 == position) {
            // "assets/" is at the beginning of the path and we don't want it
            relativePath += fullPath.substr(strlen("assets/"));
        } else {
            relativePath += fullPath;
        }
        LOGD("relative path = %s", relativePath.c_str());

        if (nullptr == FileUtilsAndroid::assetmanager) {
            LOGD("... FileUtilsAndroid::assetmanager is nullptr");
            return Data::Null;
        }

        // read asset data
        AAsset* asset =
            AAssetManager_open(FileUtilsAndroid::assetmanager,
                               relativePath.c_str(),
                               AASSET_MODE_UNKNOWN);
        if (nullptr == asset) {
            LOGD("asset is nullptr");
            return Data::Null;
        }

        off_t fileSize = AAsset_getLength(asset);

        if (forString)
        {
            data = (unsigned char*) malloc(fileSize + 1);
            data[fileSize] = '\0';
        }
        else
        {
            data = (unsigned char*) malloc(fileSize);
        }

        int bytesread = AAsset_read(asset, (void*)data, fileSize);
        size = bytesread;

        AAsset_close(asset);
    }
    else
    {
        do
        {
            // read rrom other path than user set it
            //CCLOG("GETTING FILE ABSOLUTE DATA: %s", filename);
            const char* mode = nullptr;
            if (forString)
                mode = "rt";
            else
                mode = "rb";

            FILE *fp = fopen(fullPath.c_str(), mode);
            CC_BREAK_IF(!fp);
            
            long fileSize;
            fseek(fp,0,SEEK_END);
            fileSize = ftell(fp);
            fseek(fp,0,SEEK_SET);
            if (forString)
            {
                data = (unsigned char*) malloc(fileSize + 1);
                data[fileSize] = '\0';
            }
            else
            {
                data = (unsigned char*) malloc(fileSize);
            }
            fileSize = fread(data,sizeof(unsigned char), fileSize,fp);
            fclose(fp);
            
            size = fileSize;
        } while (0);
    }
    
    Data ret;
    if (data == nullptr || size == 0)
    {
        std::string msg = "Get data from file(";
        msg.append(filename).append(") failed!");
        CCLOG("%s", msg.c_str());
    }
    else
    {
        ret.fastSet(data, size);
    }

    return ret;
}

std::string FileUtilsAndroid::getStringFromFile(const std::string& filename)
{
    Data data = getData(filename, true);
    if (data.isNull())
        return "";

    std::string ret((const char*)data.getBytes());
    return ret;
}
    
Data FileUtilsAndroid::getDataFromFile(const std::string& filename)
{
    return getData(filename, false);
}

unsigned char* FileUtilsAndroid::getFileData(const std::string& filename, const char* mode, ssize_t * size)
{    
    unsigned char * data = 0;
    
    if ( filename.empty() || (! mode) )
    {
        return 0;
    }
    
    string fullPath = fullPathForFilename(filename);
    
    if (fullPath[0] != '/')
    {
        string relativePath = string();

        size_t position = fullPath.find("assets/");
        if (0 == position) {
            // "assets/" is at the beginning of the path and we don't want it
            relativePath += fullPath.substr(strlen("assets/"));
        } else {
            relativePath += fullPath;
        }
        LOGD("relative path = %s", relativePath.c_str());

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

        // read asset data
        AAsset* asset =
            AAssetManager_open(FileUtilsAndroid::assetmanager,
                               relativePath.c_str(),
                               AASSET_MODE_UNKNOWN);
        if (nullptr == asset) {
            LOGD("asset is nullptr");
            return nullptr;
        }

        off_t fileSize = AAsset_getLength(asset);

        data = (unsigned char*) malloc(fileSize);

        int bytesread = AAsset_read(asset, (void*)data, fileSize);
        if (size)
        {
            *size = bytesread;
        }

        AAsset_close(asset);
    }
    else
    {
        do
        {
            // read rrom other path than user set it
            //CCLOG("GETTING FILE ABSOLUTE DATA: %s", filename);
            FILE *fp = fopen(fullPath.c_str(), mode);
            CC_BREAK_IF(!fp);
            
            long fileSize;
            fseek(fp,0,SEEK_END);
            fileSize = ftell(fp);
            fseek(fp,0,SEEK_SET);
            data = (unsigned char*) malloc(fileSize);
            fileSize = fread(data,sizeof(unsigned char), fileSize,fp);
            fclose(fp);
            
            if (size)
            {
                *size = fileSize;
            }
        } while (0);
    }
    
    if (! data)
    {
        std::string msg = "Get data from file(";
        msg.append(filename).append(") failed!");
        CCLOG("%s", msg.c_str());
    }
    
    return data;
}

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

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

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

NS_CC_END

#endif // CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID