Build Assimp from source

thirdparty/assimp/port/AndroidJNI/AndroidJNIIOSystem.cpp

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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2016, 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
+conditions are met:
+
+* 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,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+/** @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)

thirdparty/assimp/port/AndroidJNI/CMakeLists.txt

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+cmake_minimum_required(VERSION 2.8)
+
+include_directories(./)
+include_directories(./../../)
+add_library(android_jniiosystem STATIC AndroidJNIIOSystem.cpp)
+TARGET_LINK_LIBRARIES(android_jniiosystem android log)

thirdparty/assimp/port/AndroidJNI/README.md

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+Build Asset Importer Lib for Android
+====================================
+This module provides a facade for the io-stream-access to files behind the android-asset-management within 
+an Android-native application.
+- It is built as a static library
+- It requires Android NDK with android API > 9 support.
+
+### Building ###
+To use this module please provide following cmake defines:
+```
+-DASSIMP_ANDROID_JNIIOSYSTEM=ON
+-DCMAKE_TOOLCHAIN_FILE=$SOME_PATH/android.toolchain.cmake
+```
+
+"SOME_PATH" is a path to your cmake android toolchain script.
+
+### Code ###
+A small example how to wrap assimp for Android:
+```cpp
+#include <assimp/port/AndroidJNI/AndroidJNIIOSystem.h>
+
+Assimp::Importer* importer = new Assimp::Importer();
+Assimp::AndroidJNIIOSystem *ioSystem = new Assimp::AndroidJNIIOSystem(app->activity);
+if ( nullptr != iosSystem ) {
+  importer->SetIOHandler(ioSystem);
+}  
+```