assimp/port/AndroidJNI/AndroidJNIIOSystem.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
---------------------------------------------------------------------------

Copyright (c) 2006-2012, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
with or without modification, are permitted provided that the following 
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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
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 <code/AssimpPCH.h>
#if __ANDROID__ and __ANDROID_API__ > 9 and defined(AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT)

#include <stdlib.h>
#include <android/log.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>
#include <android/native_activity.h>
#include <assimp/port/AndroidJNI/AndroidJNIIOSystem.h>
#include <code/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;
}

// ------------------------------------------------------------------------------------------------
// 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::string 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 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.c_str(), strlen(assetContent.c_str()));
		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)