rsFileA3D.cpp - platform/frameworks/rs - Gitiles


 /*
  * Copyright (C) 2009 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef ANDROID_RS_BUILD_FOR_HOST
 #include "rsContext.h"
 #else
 #include "rsContextHostStub.h"
 #endif

 #include "rsFileA3D.h"

 #include "rsMesh.h"
 #include "rsAnimation.h"


 using namespace android;
 using namespace android::renderscript;

 FileA3D::FileA3D(Context *rsc) : ObjectBase(rsc) {
     mAlloc = NULL;
     mData = NULL;
     mWriteStream = NULL;
     mReadStream = NULL;
     mAsset = NULL;

     mMajorVersion = 0;
     mMinorVersion = 1;
     mDataSize = 0;
 }

 FileA3D::~FileA3D() {
     for (size_t i = 0; i < mIndex.size(); i ++) {
         delete mIndex[i];
     }
     for (size_t i = 0; i < mWriteIndex.size(); i ++) {
         delete mWriteIndex[i];
     }
     if (mWriteStream) {
         delete mWriteStream;
     }
     if (mReadStream) {
         delete mWriteStream;
     }
     if (mAlloc) {
         free(mAlloc);
     }
     if (mAsset) {
         delete mAsset;
     }
 }

 void FileA3D::parseHeader(IStream *headerStream) {
     mMajorVersion = headerStream->loadU32();
     mMinorVersion = headerStream->loadU32();
     uint32_t flags = headerStream->loadU32();
     mUse64BitOffsets = (flags & 1) != 0;

     uint32_t numIndexEntries = headerStream->loadU32();
     for (uint32_t i = 0; i < numIndexEntries; i ++) {
         A3DIndexEntry *entry = new A3DIndexEntry();
         headerStream->loadString(&entry->mObjectName);
         LOGV("Header data, entry name = %s", entry->mObjectName.string());
         entry->mType = (RsA3DClassID)headerStream->loadU32();
         if (mUse64BitOffsets){
             entry->mOffset = headerStream->loadOffset();
             entry->mLength = headerStream->loadOffset();
         } else {
             entry->mOffset = headerStream->loadU32();
             entry->mLength = headerStream->loadU32();
         }
         entry->mRsObj = NULL;
         mIndex.push(entry);
     }
 }

 bool FileA3D::load(Asset *asset) {
     mAsset = asset;
     return load(asset->getBuffer(false), asset->getLength());
 }

 bool FileA3D::load(const void *data, size_t length) {
     const uint8_t *localData = (const uint8_t *)data;

     size_t lengthRemaining = length;
     size_t magicStrLen = 12;
     if ((length < magicStrLen) ||
         memcmp(data, "Android3D_ff", magicStrLen)) {
         return false;
     }

     localData += magicStrLen;
     lengthRemaining -= magicStrLen;

     // Next we get our header size
     uint64_t headerSize = 0;
     if (lengthRemaining < sizeof(headerSize)) {
         return false;
     }

     memcpy(&headerSize, localData, sizeof(headerSize));
     localData += sizeof(headerSize);
     lengthRemaining -= sizeof(headerSize);

     if (lengthRemaining < headerSize) {
         return false;
     }

     // Now open the stream to parse the header
     IStream headerStream(localData, false);
     parseHeader(&headerStream);

     localData += headerSize;
     lengthRemaining -= headerSize;

     if (lengthRemaining < sizeof(mDataSize)) {
         return false;
     }

     // Read the size of the data
     memcpy(&mDataSize, localData, sizeof(mDataSize));
     localData += sizeof(mDataSize);
     lengthRemaining -= sizeof(mDataSize);

     if (lengthRemaining < mDataSize) {
         return false;
     }

     // We should know enough to read the file in at this point.
     mData = (uint8_t *)localData;
     mReadStream = new IStream(mData, mUse64BitOffsets);

     return true;
 }

 bool FileA3D::load(FILE *f) {
     char magicString[12];
     size_t len;

     LOGV("file open 1");
     len = fread(magicString, 1, 12, f);
     if ((len != 12) ||
         memcmp(magicString, "Android3D_ff", 12)) {
         return false;
     }

     // Next thing is the size of the header
     uint64_t headerSize = 0;
     len = fread(&headerSize, 1, sizeof(headerSize), f);
     if (len != sizeof(headerSize) || headerSize == 0) {
         return false;
     }

     uint8_t *headerData = (uint8_t *)malloc(headerSize);
     if (!headerData) {
         return false;
     }

     len = fread(headerData, 1, headerSize, f);
     if (len != headerSize) {
         return false;
     }

     // Now open the stream to parse the header
     IStream headerStream(headerData, false);
     parseHeader(&headerStream);

     free(headerData);

     // Next thing is the size of the header
     len = fread(&mDataSize, 1, sizeof(mDataSize), f);
     if (len != sizeof(mDataSize) || mDataSize == 0) {
         return false;
     }

     LOGV("file open size = %lli", mDataSize);

     // We should know enough to read the file in at this point.
     mAlloc = malloc(mDataSize);
     if (!mAlloc) {
         return false;
     }
     mData = (uint8_t *)mAlloc;
     len = fread(mAlloc, 1, mDataSize, f);
     if (len != mDataSize) {
         return false;
     }

     mReadStream = new IStream(mData, mUse64BitOffsets);

     LOGV("Header is read an stream initialized");
     return true;
 }

 size_t FileA3D::getNumIndexEntries() const {
     return mIndex.size();
 }

 const FileA3D::A3DIndexEntry *FileA3D::getIndexEntry(size_t index) const {
     if (index < mIndex.size()) {
         return mIndex[index];
     }
     return NULL;
 }

 ObjectBase *FileA3D::initializeFromEntry(size_t index) {
     if (index >= mIndex.size()) {
         return NULL;
     }

     FileA3D::A3DIndexEntry *entry = mIndex[index];
     if (!entry) {
         return NULL;
     }

     if (entry->mRsObj) {
         entry->mRsObj->incUserRef();
         return entry->mRsObj;
     }

     // Seek to the beginning of object
     mReadStream->reset(entry->mOffset);
     switch (entry->mType) {
         case RS_A3D_CLASS_ID_UNKNOWN:
             return NULL;
         case RS_A3D_CLASS_ID_MESH:
             entry->mRsObj = Mesh::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_TYPE:
             entry->mRsObj = Type::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_ELEMENT:
             entry->mRsObj = Element::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_ALLOCATION:
             entry->mRsObj = Allocation::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_PROGRAM_VERTEX:
             entry->mRsObj = ProgramVertex::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_PROGRAM_RASTER:
             entry->mRsObj = ProgramRaster::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_PROGRAM_FRAGMENT:
             entry->mRsObj = ProgramFragment::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_PROGRAM_STORE:
             entry->mRsObj = ProgramStore::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_SAMPLER:
             entry->mRsObj = Sampler::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_ANIMATION:
             entry->mRsObj = Animation::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_ADAPTER_1D:
             entry->mRsObj = Adapter1D::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_ADAPTER_2D:
             entry->mRsObj = Adapter2D::createFromStream(mRSC, mReadStream);
             break;
         case RS_A3D_CLASS_ID_SCRIPT_C:
             return NULL;
     }
     if (entry->mRsObj) {
         entry->mRsObj->incUserRef();
     }
     return entry->mRsObj;
 }

 bool FileA3D::writeFile(const char *filename) {
     if (!mWriteStream) {
         LOGE("No objects to write\n");
         return false;
     }
     if (mWriteStream->getPos() == 0) {
         LOGE("No objects to write\n");
         return false;
     }

     FILE *writeHandle = fopen(filename, "wb");
     if (!writeHandle) {
         LOGE("Couldn't open the file for writing\n");
         return false;
     }

     // Open a new stream to make writing the header easier
     OStream headerStream(5*1024, false);
     headerStream.addU32(mMajorVersion);
     headerStream.addU32(mMinorVersion);
     uint32_t is64Bit = 0;
     headerStream.addU32(is64Bit);

     uint32_t writeIndexSize = mWriteIndex.size();
     headerStream.addU32(writeIndexSize);
     for (uint32_t i = 0; i < writeIndexSize; i ++) {
         headerStream.addString(&mWriteIndex[i]->mObjectName);
         headerStream.addU32((uint32_t)mWriteIndex[i]->mType);
         if (mUse64BitOffsets){
             headerStream.addOffset(mWriteIndex[i]->mOffset);
             headerStream.addOffset(mWriteIndex[i]->mLength);
         } else {
             uint32_t offset = (uint32_t)mWriteIndex[i]->mOffset;
             headerStream.addU32(offset);
             offset = (uint32_t)mWriteIndex[i]->mLength;
             headerStream.addU32(offset);
         }
     }

     // Write our magic string so we know we are reading the right file
     String8 magicString(A3D_MAGIC_KEY);
     fwrite(magicString.string(), sizeof(char), magicString.size(), writeHandle);

     // Store the size of the header to make it easier to parse when we read it
     uint64_t headerSize = headerStream.getPos();
     fwrite(&headerSize, sizeof(headerSize), 1, writeHandle);

     // Now write our header
     fwrite(headerStream.getPtr(), sizeof(uint8_t), headerStream.getPos(), writeHandle);

     // Now write the size of the data part of the file for easier parsing later
     uint64_t fileDataSize = mWriteStream->getPos();
     fwrite(&fileDataSize, sizeof(fileDataSize), 1, writeHandle);

     fwrite(mWriteStream->getPtr(), sizeof(uint8_t), mWriteStream->getPos(), writeHandle);

     int status = fclose(writeHandle);

     if (status != 0) {
         LOGE("Couldn't close file\n");
         return false;
     }

     return true;
 }

 void FileA3D::appendToFile(ObjectBase *obj) {
     if (!obj) {
         return;
     }
     if (!mWriteStream) {
         const uint64_t initialStreamSize = 256*1024;
         mWriteStream = new OStream(initialStreamSize, false);
     }
     A3DIndexEntry *indexEntry = new A3DIndexEntry();
     indexEntry->mObjectName.setTo(obj->getName());
     indexEntry->mType = obj->getClassId();
     indexEntry->mOffset = mWriteStream->getPos();
     indexEntry->mRsObj = obj;
     mWriteIndex.push(indexEntry);
     obj->serialize(mWriteStream);
     indexEntry->mLength = mWriteStream->getPos() - indexEntry->mOffset;
     mWriteStream->align(4);
 }

 RsObjectBase rsaFileA3DGetEntryByIndex(RsContext con, uint32_t index, RsFile file) {
     FileA3D *fa3d = static_cast<FileA3D *>(file);
     if (!fa3d) {
         LOGE("Can't load entry. No valid file");
         return NULL;
     }

     ObjectBase *obj = fa3d->initializeFromEntry(index);
     LOGV("Returning object with name %s", obj->getName());

     return obj;
 }


 void rsaFileA3DGetNumIndexEntries(RsContext con, int32_t *numEntries, RsFile file) {
     FileA3D *fa3d = static_cast<FileA3D *>(file);

     if (fa3d) {
         *numEntries = fa3d->getNumIndexEntries();
     } else {
         *numEntries = 0;
     }
 }

 void rsaFileA3DGetIndexEntries(RsContext con, RsFileIndexEntry *fileEntries, uint32_t numEntries, RsFile file) {
     FileA3D *fa3d = static_cast<FileA3D *>(file);

     if (!fa3d) {
         LOGE("Can't load index entries. No valid file");
         return;
     }

     uint32_t numFileEntries = fa3d->getNumIndexEntries();
     if (numFileEntries != numEntries || numEntries == 0 || fileEntries == NULL) {
         LOGE("Can't load index entries. Invalid number requested");
         return;
     }

     for (uint32_t i = 0; i < numFileEntries; i ++) {
         const FileA3D::A3DIndexEntry *entry = fa3d->getIndexEntry(i);
         fileEntries[i].classID = entry->getType();
         fileEntries[i].objectName = entry->getObjectName().string();
     }
 }

 RsFile rsaFileA3DCreateFromMemory(RsContext con, const void *data, uint32_t len) {
     if (data == NULL) {
         LOGE("File load failed. Asset stream is NULL");
         return NULL;
     }

     Context *rsc = static_cast<Context *>(con);
     FileA3D *fa3d = new FileA3D(rsc);
     fa3d->incUserRef();

     fa3d->load(data, len);
     return fa3d;
 }

 RsFile rsaFileA3DCreateFromAsset(RsContext con, void *_asset) {
     Context *rsc = static_cast<Context *>(con);
     Asset *asset = static_cast<Asset *>(_asset);
     FileA3D *fa3d = new FileA3D(rsc);
     fa3d->incUserRef();

     fa3d->load(asset);
     return fa3d;
 }

 RsFile rsaFileA3DCreateFromFile(RsContext con, const char *path) {
     if (path == NULL) {
         LOGE("File load failed. Path is NULL");
         return NULL;
     }

     Context *rsc = static_cast<Context *>(con);
     FileA3D *fa3d = NULL;

     FILE *f = fopen(path, "rb");
     if (f) {
         fa3d = new FileA3D(rsc);
         fa3d->incUserRef();
         fa3d->load(f);
         fclose(f);
     } else {
         LOGE("Could not open file %s", path);
     }

     return fa3d;
 }

	/*
	* Copyright (C) 2009 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef ANDROID_RS_BUILD_FOR_HOST
	#include "rsContext.h"
	#else
	#include "rsContextHostStub.h"
	#endif

	#include "rsFileA3D.h"

	#include "rsMesh.h"
	#include "rsAnimation.h"


	using namespace android;
	using namespace android::renderscript;

	FileA3D::FileA3D(Context *rsc) : ObjectBase(rsc) {
	mAlloc = NULL;
	mData = NULL;
	mWriteStream = NULL;
	mReadStream = NULL;
	mAsset = NULL;

	mMajorVersion = 0;
	mMinorVersion = 1;
	mDataSize = 0;
	}

	FileA3D::~FileA3D() {
	for (size_t i = 0; i < mIndex.size(); i ++) {
	delete mIndex[i];
	}
	for (size_t i = 0; i < mWriteIndex.size(); i ++) {
	delete mWriteIndex[i];
	}
	if (mWriteStream) {
	delete mWriteStream;
	}
	if (mReadStream) {
	delete mWriteStream;
	}
	if (mAlloc) {
	free(mAlloc);
	}
	if (mAsset) {
	delete mAsset;
	}
	}

	void FileA3D::parseHeader(IStream *headerStream) {
	mMajorVersion = headerStream->loadU32();
	mMinorVersion = headerStream->loadU32();
	uint32_t flags = headerStream->loadU32();
	mUse64BitOffsets = (flags & 1) != 0;

	uint32_t numIndexEntries = headerStream->loadU32();
	for (uint32_t i = 0; i < numIndexEntries; i ++) {
	A3DIndexEntry *entry = new A3DIndexEntry();
	headerStream->loadString(&entry->mObjectName);
	LOGV("Header data, entry name = %s", entry->mObjectName.string());
	entry->mType = (RsA3DClassID)headerStream->loadU32();
	if (mUse64BitOffsets){
	entry->mOffset = headerStream->loadOffset();
	entry->mLength = headerStream->loadOffset();
	} else {
	entry->mOffset = headerStream->loadU32();
	entry->mLength = headerStream->loadU32();
	}
	entry->mRsObj = NULL;
	mIndex.push(entry);
	}
	}

	bool FileA3D::load(Asset *asset) {
	mAsset = asset;
	return load(asset->getBuffer(false), asset->getLength());
	}

	bool FileA3D::load(const void *data, size_t length) {
	const uint8_t localData = (const uint8_t )data;

	size_t lengthRemaining = length;
	size_t magicStrLen = 12;
	if ((length < magicStrLen) \|\|
	memcmp(data, "Android3D_ff", magicStrLen)) {
	return false;
	}

	localData += magicStrLen;
	lengthRemaining -= magicStrLen;

	// Next we get our header size
	uint64_t headerSize = 0;
	if (lengthRemaining < sizeof(headerSize)) {
	return false;
	}

	memcpy(&headerSize, localData, sizeof(headerSize));
	localData += sizeof(headerSize);
	lengthRemaining -= sizeof(headerSize);

	if (lengthRemaining < headerSize) {
	return false;
	}

	// Now open the stream to parse the header
	IStream headerStream(localData, false);
	parseHeader(&headerStream);

	localData += headerSize;
	lengthRemaining -= headerSize;

	if (lengthRemaining < sizeof(mDataSize)) {
	return false;
	}

	// Read the size of the data
	memcpy(&mDataSize, localData, sizeof(mDataSize));
	localData += sizeof(mDataSize);
	lengthRemaining -= sizeof(mDataSize);

	if (lengthRemaining < mDataSize) {
	return false;
	}

	// We should know enough to read the file in at this point.
	mData = (uint8_t *)localData;
	mReadStream = new IStream(mData, mUse64BitOffsets);

	return true;
	}

	bool FileA3D::load(FILE *f) {
	char magicString[12];
	size_t len;

	LOGV("file open 1");
	len = fread(magicString, 1, 12, f);
	if ((len != 12) \|\|
	memcmp(magicString, "Android3D_ff", 12)) {
	return false;
	}

	// Next thing is the size of the header
	uint64_t headerSize = 0;
	len = fread(&headerSize, 1, sizeof(headerSize), f);
	if (len != sizeof(headerSize) \|\| headerSize == 0) {
	return false;
	}

	uint8_t headerData = (uint8_t )malloc(headerSize);
	if (!headerData) {
	return false;
	}

	len = fread(headerData, 1, headerSize, f);
	if (len != headerSize) {
	return false;
	}

	// Now open the stream to parse the header
	IStream headerStream(headerData, false);
	parseHeader(&headerStream);

	free(headerData);

	// Next thing is the size of the header
	len = fread(&mDataSize, 1, sizeof(mDataSize), f);
	if (len != sizeof(mDataSize) \|\| mDataSize == 0) {
	return false;
	}

	LOGV("file open size = %lli", mDataSize);

	// We should know enough to read the file in at this point.
	mAlloc = malloc(mDataSize);
	if (!mAlloc) {
	return false;
	}
	mData = (uint8_t *)mAlloc;
	len = fread(mAlloc, 1, mDataSize, f);
	if (len != mDataSize) {
	return false;
	}

	mReadStream = new IStream(mData, mUse64BitOffsets);

	LOGV("Header is read an stream initialized");
	return true;
	}

	size_t FileA3D::getNumIndexEntries() const {
	return mIndex.size();
	}

	const FileA3D::A3DIndexEntry *FileA3D::getIndexEntry(size_t index) const {
	if (index < mIndex.size()) {
	return mIndex[index];
	}
	return NULL;
	}

	ObjectBase *FileA3D::initializeFromEntry(size_t index) {
	if (index >= mIndex.size()) {
	return NULL;
	}

	FileA3D::A3DIndexEntry *entry = mIndex[index];
	if (!entry) {
	return NULL;
	}

	if (entry->mRsObj) {
	entry->mRsObj->incUserRef();
	return entry->mRsObj;
	}

	// Seek to the beginning of object
	mReadStream->reset(entry->mOffset);
	switch (entry->mType) {
	case RS_A3D_CLASS_ID_UNKNOWN:
	return NULL;
	case RS_A3D_CLASS_ID_MESH:
	entry->mRsObj = Mesh::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_TYPE:
	entry->mRsObj = Type::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_ELEMENT:
	entry->mRsObj = Element::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_ALLOCATION:
	entry->mRsObj = Allocation::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_PROGRAM_VERTEX:
	entry->mRsObj = ProgramVertex::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_PROGRAM_RASTER:
	entry->mRsObj = ProgramRaster::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_PROGRAM_FRAGMENT:
	entry->mRsObj = ProgramFragment::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_PROGRAM_STORE:
	entry->mRsObj = ProgramStore::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_SAMPLER:
	entry->mRsObj = Sampler::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_ANIMATION:
	entry->mRsObj = Animation::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_ADAPTER_1D:
	entry->mRsObj = Adapter1D::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_ADAPTER_2D:
	entry->mRsObj = Adapter2D::createFromStream(mRSC, mReadStream);
	break;
	case RS_A3D_CLASS_ID_SCRIPT_C:
	return NULL;
	}
	if (entry->mRsObj) {
	entry->mRsObj->incUserRef();
	}
	return entry->mRsObj;
	}

	bool FileA3D::writeFile(const char *filename) {
	if (!mWriteStream) {
	LOGE("No objects to write\n");
	return false;
	}
	if (mWriteStream->getPos() == 0) {
	LOGE("No objects to write\n");
	return false;
	}

	FILE *writeHandle = fopen(filename, "wb");
	if (!writeHandle) {
	LOGE("Couldn't open the file for writing\n");
	return false;
	}

	// Open a new stream to make writing the header easier
	OStream headerStream(5*1024, false);
	headerStream.addU32(mMajorVersion);
	headerStream.addU32(mMinorVersion);
	uint32_t is64Bit = 0;
	headerStream.addU32(is64Bit);

	uint32_t writeIndexSize = mWriteIndex.size();
	headerStream.addU32(writeIndexSize);
	for (uint32_t i = 0; i < writeIndexSize; i ++) {
	headerStream.addString(&mWriteIndex[i]->mObjectName);
	headerStream.addU32((uint32_t)mWriteIndex[i]->mType);
	if (mUse64BitOffsets){
	headerStream.addOffset(mWriteIndex[i]->mOffset);
	headerStream.addOffset(mWriteIndex[i]->mLength);
	} else {
	uint32_t offset = (uint32_t)mWriteIndex[i]->mOffset;
	headerStream.addU32(offset);
	offset = (uint32_t)mWriteIndex[i]->mLength;
	headerStream.addU32(offset);
	}
	}

	// Write our magic string so we know we are reading the right file
	String8 magicString(A3D_MAGIC_KEY);
	fwrite(magicString.string(), sizeof(char), magicString.size(), writeHandle);

	// Store the size of the header to make it easier to parse when we read it
	uint64_t headerSize = headerStream.getPos();
	fwrite(&headerSize, sizeof(headerSize), 1, writeHandle);

	// Now write our header
	fwrite(headerStream.getPtr(), sizeof(uint8_t), headerStream.getPos(), writeHandle);

	// Now write the size of the data part of the file for easier parsing later
	uint64_t fileDataSize = mWriteStream->getPos();
	fwrite(&fileDataSize, sizeof(fileDataSize), 1, writeHandle);

	fwrite(mWriteStream->getPtr(), sizeof(uint8_t), mWriteStream->getPos(), writeHandle);

	int status = fclose(writeHandle);

	if (status != 0) {
	LOGE("Couldn't close file\n");
	return false;
	}

	return true;
	}

	void FileA3D::appendToFile(ObjectBase *obj) {
	if (!obj) {
	return;
	}
	if (!mWriteStream) {
	const uint64_t initialStreamSize = 256*1024;
	mWriteStream = new OStream(initialStreamSize, false);
	}
	A3DIndexEntry *indexEntry = new A3DIndexEntry();
	indexEntry->mObjectName.setTo(obj->getName());
	indexEntry->mType = obj->getClassId();
	indexEntry->mOffset = mWriteStream->getPos();
	indexEntry->mRsObj = obj;
	mWriteIndex.push(indexEntry);
	obj->serialize(mWriteStream);
	indexEntry->mLength = mWriteStream->getPos() - indexEntry->mOffset;
	mWriteStream->align(4);
	}

	RsObjectBase rsaFileA3DGetEntryByIndex(RsContext con, uint32_t index, RsFile file) {
	FileA3D fa3d = static_cast<FileA3D >(file);
	if (!fa3d) {
	LOGE("Can't load entry. No valid file");
	return NULL;
	}

	ObjectBase *obj = fa3d->initializeFromEntry(index);
	LOGV("Returning object with name %s", obj->getName());

	return obj;
	}


	void rsaFileA3DGetNumIndexEntries(RsContext con, int32_t *numEntries, RsFile file) {
	FileA3D fa3d = static_cast<FileA3D >(file);

	if (fa3d) {
	*numEntries = fa3d->getNumIndexEntries();
	} else {
	*numEntries = 0;
	}
	}

	void rsaFileA3DGetIndexEntries(RsContext con, RsFileIndexEntry *fileEntries, uint32_t numEntries, RsFile file) {
	FileA3D fa3d = static_cast<FileA3D >(file);

	if (!fa3d) {
	LOGE("Can't load index entries. No valid file");
	return;
	}

	uint32_t numFileEntries = fa3d->getNumIndexEntries();
	if (numFileEntries != numEntries \|\| numEntries == 0 \|\| fileEntries == NULL) {
	LOGE("Can't load index entries. Invalid number requested");
	return;
	}

	for (uint32_t i = 0; i < numFileEntries; i ++) {
	const FileA3D::A3DIndexEntry *entry = fa3d->getIndexEntry(i);
	fileEntries[i].classID = entry->getType();
	fileEntries[i].objectName = entry->getObjectName().string();
	}
	}

	RsFile rsaFileA3DCreateFromMemory(RsContext con, const void *data, uint32_t len) {
	if (data == NULL) {
	LOGE("File load failed. Asset stream is NULL");
	return NULL;
	}

	Context rsc = static_cast<Context >(con);
	FileA3D *fa3d = new FileA3D(rsc);
	fa3d->incUserRef();

	fa3d->load(data, len);
	return fa3d;
	}

	RsFile rsaFileA3DCreateFromAsset(RsContext con, void *_asset) {
	Context rsc = static_cast<Context >(con);
	Asset asset = static_cast<Asset >(_asset);
	FileA3D *fa3d = new FileA3D(rsc);
	fa3d->incUserRef();

	fa3d->load(asset);
	return fa3d;
	}

	RsFile rsaFileA3DCreateFromFile(RsContext con, const char *path) {
	if (path == NULL) {
	LOGE("File load failed. Path is NULL");
	return NULL;
	}

	Context rsc = static_cast<Context >(con);
	FileA3D *fa3d = NULL;

	FILE *f = fopen(path, "rb");
	if (f) {
	fa3d = new FileA3D(rsc);
	fa3d->incUserRef();
	fa3d->load(f);
	fclose(f);
	} else {
	LOGE("Could not open file %s", path);
	}

	return fa3d;
	}