assimp/port/AndroidJNI/AndroidJNIIOSystem.cpp

/*
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Open Asset Import Library (assimp)
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Copyright (c) 2006-2021, assimp team

All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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* Neither the name of the assimp team, nor the names of its
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file Android extension of DefaultIOSystem using the standard C file functions */


#include <assimp/config.h>
#include <android/api-level.h>
#if __ANDROID__ and __ANDROID_API__ > 9 and defined(AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT)

#include <libgen.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <android/log.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>
#include <android/native_activity.h>
#include <assimp/ai_assert.h>
#include <assimp/port/AndroidJNI/AndroidJNIIOSystem.h>
#include <assimp/DefaultIOStream.h>
#include <fstream>

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Constructor.
AndroidJNIIOSystem::AndroidJNIIOSystem(ANativeActivity* activity)
{
	AndroidActivityInit(activity);
}

AndroidJNIIOSystem::AndroidJNIIOSystem(const char *internalPath, AAssetManager assetManager) :
        mApkWorkspacePath(internalDataPath),
        mApkAssetManager(assetManager) {
    // empty
}

// ------------------------------------------------------------------------------------------------
// Destructor.
AndroidJNIIOSystem::~AndroidJNIIOSystem() {
    // nothing to do here
}

// ------------------------------------------------------------------------------------------------
// Tests for the existence of a file at the given path.
bool AndroidJNIIOSystem::Exists( const char* pFile) const {
    AAsset* asset = AAssetManager_open(mApkAssetManager, pFile, AASSET_MODE_UNKNOWN);
    FILE* file = ::fopen( (mApkWorkspacePath + getOsSeparator() + std::string(pFile)).c_str(), "rb");
	
    if (!asset && !file) {
        __android_log_print(ANDROID_LOG_ERROR, "Assimp", "Asset manager can not find: %s", pFile);
        return false;
    }

    __android_log_print(ANDROID_LOG_ERROR, "Assimp", "Asset exists");
    if (file) {
        ::fclose( file);
    }
    
    return true;
}

// ------------------------------------------------------------------------------------------------
// Inits Android extractor
void AndroidJNIIOSystem::AndroidActivityInit(ANativeActivity* activity) {
    if (activity == nullptr) {
        return;
    }
    mApkWorkspacePath = activity->internalDataPath;
    mApkAssetManager = activity->assetManager;
}

// ------------------------------------------------------------------------------------------------
// Create the directory for the extracted resource
static int mkpath(std::string path, mode_t mode) {
    if (mkdir(path.c_str(), mode) == -1) {
        switch(errno) {
            case ENOENT:
                if (mkpath(path.substr(0, path.find_last_of('/')), mode) == -1)
                    return -1;
                else
                    return mkdir(path.c_str(), mode);
            case EEXIST:
                return 0;
            default:
                return -1;
        }
    }

    return 0;
}

// ------------------------------------------------------------------------------------------------
// Extracts android asset
bool AndroidJNIIOSystem::AndroidExtractAsset(std::string name) {
    std::string newPath = mApkWorkspacePath + getOsSeparator() + name;

    DefaultIOSystem io;

    // Do not extract if extracted already
    if ( io.Exists(newPath.c_str()) ) {
        __android_log_print(ANDROID_LOG_DEFAULT, "Assimp", "Asset already extracted");
        return true;
    }
	
    // Open file
    AAsset* asset = AAssetManager_open(mApkAssetManager, name.c_str(),
			AASSET_MODE_UNKNOWN);
    std::vector<char> assetContent;

    if (asset != NULL) {
        // Find size
        off_t assetSize = AAsset_getLength(asset);

        // Prepare input buffer
        assetContent.resize(assetSize);

        // Store input buffer
        AAsset_read(asset, &assetContent[0], assetSize);

        // Close
        AAsset_close(asset);

        // Prepare directory for output buffer
        std::string directoryNewPath = newPath;
        directoryNewPath = dirname(&directoryNewPath[0]);

        if (mkpath(directoryNewPath, S_IRUSR | S_IWUSR | S_IXUSR) == -1) {
             __android_log_print(ANDROID_LOG_ERROR, "assimp", "Can not create the directory for the output file");
        }

        // Prepare output buffer
        std::ofstream assetExtracted(newPath.c_str(), std::ios::out | std::ios::binary);
        if (!assetExtracted) {
            __android_log_print(ANDROID_LOG_ERROR, "assimp", "Can not open output file");
        }

        // Write output buffer into a file
        assetExtracted.write(&assetContent[0], assetContent.size());
        assetExtracted.close();

        __android_log_print(ANDROID_LOG_DEFAULT, "Assimp", "Asset extracted");
    } else {
        __android_log_print(ANDROID_LOG_ERROR, "assimp", "Asset not found: %s", name.c_str());
        return false;
    }
	
    return true;
}

// ------------------------------------------------------------------------------------------------
// Open a new file with a given path.
IOStream* AndroidJNIIOSystem::Open( const char* strFile, const char* strMode) {
    ai_assert(nullptr != strFile);
    ai_assert(nullptr != strMode);

    std::string fullPath(mApkWorkspacePath + getOsSeparator() + std::string(strFile));
    if (Exists(strFile)) {
	AndroidExtractAsset(std::string(strFile));
    }

    FILE* file = ::fopen( fullPath.c_str(), strMode);
    if (nullptr == file) {
        return nullptr;
    }

    __android_log_print(ANDROID_LOG_ERROR, "assimp", "AndroidIOSystem: file %s opened", fullPath.c_str());
    return new DefaultIOStream(file, fullPath);
}

#undef PATHLIMIT
#endif // __ANDROID__ and __ANDROID_API__ > 9 and defined(AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT)