assimp/port/AndroidJNI/AndroidJNIIOSystem.cpp

/*
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Open Asset Import Library (assimp)
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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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);
}

// ------------------------------------------------------------------------------------------------
// 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)
{
	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(NULL != strFile);
	ai_assert(NULL != strMode);

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

	FILE* file = ::fopen( fullPath.c_str(), strMode);

	if( NULL == file)
		return NULL;

	__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)