/*

* Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

* Copy of pfsdump.h from syslibs code (syslibs/development/common/syslibs/store/HTOOLS/).Added CheckFileValidity() method.

*

*/

#include "pfsdump.h"

// Class StoreFile

int StoreFile::OutWidth;

StoreFile::StoreFile()

	{

	}

bool StoreFile::CheckFileValidity(char const* aFile,const Options& aOptions)

	{

	DumpSWICertstoreTool Tool;                  

	iFile.open(aFile, ios::binary);

	if(!iFile)

		{

		throw ECannotOpenFile;

		}

	else

		{

		unsigned long uid;

		iFile.read((char*)&uid,sizeof(uid));

		iFile.seekg(0,ios::end);

		int size = iFile.tellg();

		if(size <= 0)

			{

			if(!aOptions.CreateCCIFile() && !aOptions.CreateDetailCCIFile())

				{

				cout << aFile <<" : File is Empty" << endl << endl;

				}

			return false;

			}

		if (size<FrameDes::First || uid!=PermanentFileStoreUid)

			{

			if(aOptions.CBasedWritableCertstore() || aOptions.ROMCertstore())

				{

				if(!aOptions.CreateCCIFile() && !aOptions.CreateDetailCCIFile())

					{

					cout << aFile <<": Is not a dat file \nor is a corrupt file" << endl << endl;

					}

				return false;

				}

			}

		else

			{

			if(aOptions.CBasedWritableCertstore() || aOptions.ROMCertstore())

				{

				if(!aOptions.CreateCCIFile() && !aOptions.CreateDetailCCIFile())

					{

					cout << aFile <<":" << endl;

					}

				}

			}

		iSize = size;

		int width = 0;

		while (size)

			{

			++width;

			size >>= 4;

			}

		OutWidth = width;

		iFile.seekg(Header::Offset,ios::beg);

		iFile.read((char*)&iHeader,Header::Size);

		if (Empty())

			{

			return false;

			}

		LoadFrames();

		LoadToc();

		}

	return true;

	}

StoreFile::~StoreFile()

	{

	iFile.close();

	}

void StoreFile::LoadFrames()

	{

	FrameDes frame;

	int offset = FrameDes::First;

	int full = FrameDes::First+FrameDes::Interval;

	int diff = FrameDes::First;

	while (offset-FrameDes::Size<iSize)

		{

		if (offset==full)

			{

			full+=FrameDes::Interval;

			diff+=FrameDes::Size;

			}

		if (offset>iSize)

			{

			DumpSWICertstoreTool::Warning() << "in-complete link at " << FramePos(offset-diff) << endl;

			break;

			}

		iFile.seekg(offset-FrameDes::Size,ios::beg);

		iFile >> frame;

		iFrames.Add(FramePos(offset-diff),frame);

		int length = frame.Length();

		if (length == 0)

			{

			if (full>iSize && offset>iSize)

				{

				DumpSWICertstoreTool::Warning() << "in-complete frame at " << FramePos(offset-diff) << endl;

				}

			offset = full;

			}

		else

			{

			int newoffset = offset+length+FrameDes::Size;

			if (newoffset>=full || newoffset-FrameDes::Size>iSize)

				{

				DumpSWICertstoreTool::Error() << "bad link at " << FramePos(offset-diff) << ", skipping to next anchor link" << endl;

				offset=full;

				}

			else

				{

				offset = newoffset;

				if (full-offset<=FrameDes::Size)

					{

					offset=full;

					}

				}

			}

		}

	iFrames.Complete();

	}

void StoreFile::LoadToc()

	{

	FramePos toc=iHeader.Toc();

	Stream stream(iFrames,toc);

	if (!stream.IsGood())

		{

		DumpSWICertstoreTool::Error() << "invalid toc address " << toc << endl;

		return;

		}

	if (stream.Type()!=FrameDes::Toc)

		{

		DumpSWICertstoreTool::Error() << "toc address " << toc << ": refers to non-toc frame"<< endl;

		return;

		}

	// find the requested store revision

	Frames::Iterator f=stream.Frame();

	Frames::Iterator const first=iFrames.Begin();

	for (int rev=Tool.TocRevision();rev;--rev)

		{

		do{

			if (--f<first)

				{

				throw ENotAPermanentFileStore;

				}

			} while (f->iDes.Type()!=FrameDes::Toc);

		}

	iToc.Load(iFile,iFrames,f,iHeader.GetReloc());

	// verify the Toc stream references

	Toc::Iterator const end=iToc.End();

	for (Toc::Iterator iter=iToc.Begin();iter<end;++iter)

		{

		if (iter->iHandle.IsNull())

			{

			DumpSWICertstoreTool::Error() << "missing entry in toc-delta for index " << (1+iter-iToc.Begin()) << endl;

			}

		else if (!iter->iHandle.Avail() && iter->Pos().Pos()>=0)

			{

			f=iFrames.Find(iter->Pos());

			if (f==NULL)

				{

				DumpSWICertstoreTool::Error() << "invalid stream reference in toc entry " << iter->iHandle << endl;

				}

			else if (iter->Pos().Pos()>=toc.Pos())

				{

				DumpSWICertstoreTool::Error() << "virtual stream reference in toc entry " << iter->iHandle << endl;

				}

			else if (f->iDes.Type()!=FrameDes::Data)

				{

				DumpSWICertstoreTool::Error() << "toc entry " << iter->iHandle << ": refers to non-data frame" << endl;

				}

			}

		}

	}

Stream StoreFile::RootStream()

	{

	Toc::Head const& head=iToc.Header();

	}

Stream StoreFile::FindStream(Handle& aHandle)

	{

	Toc::Iterator const end=iToc.End();

	Toc::Head const& head=iToc.Header();

	for (Toc::Iterator iter=iToc.Begin();iter<end;++iter)

		{

		if (!iter->iHandle.Avail())

			{

			if (iter->Pos().Pos() == -1)

				{

				continue;

				}

			if (iter->iHandle == aHandle)

				{

				return Stream(iFrames, iter->Pos());

				}

			}

		}

	throw ENotAPermanentFileStore;

	}

ifstream& StoreFile::File() 

	{

	return iFile;

	}

// Class Toc

Toc::Toc()

	: iPos(0), iRep(NULL), iAvail(0)

	{

	memset(&iHeader,0,sizeof(iHeader));

	}

Toc::~Toc()

	{

	free(iRep);

	}

void Toc::Base(const char* aPtr,int aCount)

	{

	Entry* e=iRep;

	for (int i=1;i<=aCount;++e,++i)

		{

		e->iHandle=i;	// set the index part

		memcpy((char*)e+Entry::BaseRedundant,aPtr,Entry::BaseSize);

		aPtr+=Entry::BaseSize;

		}

	}

void Toc::Load(istream& aStream,Frames const& aFrames,Frames::Iterator aFrame,Header::Reloc const* aReloc)

	{

	iPos = aFrame->iPos;

	Stream toc1(aFrame);

	void* toc = toc1.Load(aStream);

	const char* p = reinterpret_cast<char*>(toc);

	memcpy(&iHeader,p,Head::Size);

	p+=Head::Size;

	int n = iHeader.iCount;

	if (n < 0)

		{

		memset(&iHeader,0,Head::Size);

		DumpSWICertstoreTool::Error() << "corrupt toc" << endl;

		return;

		}

	iRep=static_cast<Entry*>(malloc(n*sizeof(Entry)));

	if (iRep==NULL)

		{

		throw ENotAPermanentFileStore;

		}

	if (iHeader.IsDelta())

		{

		// verify the delta header

		memcpy(&iDelta,p,DeltaHead::Size);

		p+=DeltaHead::Size;

		int dn = iDelta.iCount;

		if (toc1.Length() != Head::Size + DeltaHead::Size + dn * Entry::DeltaSize)

			{

			memset(&iHeader,0,Head::Size);

			DumpSWICertstoreTool::Error() << "in-complete toc" << endl;

			return;

			}

		// find the toc-base

		FramePos tocbase(iDelta.iBase + Header::tocoffset);

		if (aReloc && aReloc->iHandle.IsTocBase())

			{

			tocbase = aReloc->iPos;

			}

		Stream toc2(aFrames,tocbase);

		if (!toc2.IsGood())

			{

			memset(&iHeader,0,Head::Size);

			DumpSWICertstoreTool::Error() << "invalid toc-base address " << tocbase << endl;

			return;

			}

		if (toc2.Type()!=FrameDes::Toc)

			{

			memset(&iHeader,0,Head::Size);

			DumpSWICertstoreTool::Error() << "toc-base address " << tocbase << ": refers to non-toc frame"<< endl;

			return;

			}

		// validate and load the toc-base

		void* tocb = toc2.Load(aStream);

		const char* p2 = reinterpret_cast<char*>(tocb);

		Head headbase;

		memcpy(&headbase,p2,Head::Size);

		p2+=Head::Size;

		if (headbase.IsDelta())

			{

			memset(&iHeader,0,Head::Size);

			DumpSWICertstoreTool::Error() << "toc-base is a toc-delta"<< endl;

			return;

			}

		int bn = headbase.iCount;

		if (bn > n)

			{

			memset(&iHeader,0,Head::Size);

			DumpSWICertstoreTool::Error() << "toc-base is larger than toc"<< endl;

			return;

			}

		Base(p2,bn);

		free(tocb);

		// validate and update with the toc-delta

		int last = 0;

		while (--dn>=0)

			{

			Entry e;

			memcpy(&e,p,Entry::DeltaSize);

			p+=Entry::DeltaSize;

			int ix = e.iHandle.Index();

			if (ix<=0 || ix > n)

				{

				memset(&iHeader,0,Head::Size);

				DumpSWICertstoreTool::Error() << "toc-delta entry " << e.iHandle << " is outside toc"<< endl;

				return;

				}

			if (ix <= last)

				{

				memset(&iHeader,0,Head::Size);

				DumpSWICertstoreTool::Error() << "toc-delta entry " << e.iHandle << " is out of order"<< endl;

				return;

				}

			iRep[ix-1] = e;

			last = ix;

			}

		}

	else

		{

		if (toc1.Length() != Head::Size + n * Entry::BaseSize)

			{

			memset(&iHeader,0,Head::Size);

			DumpSWICertstoreTool::Error() << "in-complete toc" << endl;

			return;

			}

		Base(p,n);

		}

	free(toc);

	// apply the relocation

	if (aReloc && !aReloc->iHandle.IsTocBase())

		{

		int ix=aReloc->iHandle.Index();

		if (ix<=0 || ix>n)

			{

			throw ENotAPermanentFileStore;

			}

		Entry& e=iRep[ix-1];

		if (e.iHandle.Generation()!=aReloc->iHandle.Generation())

			{

			throw ENotAPermanentFileStore;

			}

		e.iPos=aReloc->iPos.Pos();

		}

	// count the available entries

	int avail=0;

	for (int i=0;i<n;++i)

		{

		if (iRep[i].iHandle.Avail())

		++avail;

		}

	iAvail=avail;

	// verify the available list

	Handle link=iHeader.iAvail;

	if (!link.IsNull())

		{

		int ix=link.Index();

		if (!link.Avail() || ix<=0 || ix >iHeader.iCount)

			{

			DumpSWICertstoreTool::Error() << "corrupt available link in toc header " << link << endl;

			return;

			}

		Entry const* en=&(*this)[ix];

		if (en->iHandle!=link)

			{

			DumpSWICertstoreTool::Error() << "corrupt available link in toc header " << link << endl;

			return;

			}

		for (;;)

			{

			if (--avail<0)

				{

				DumpSWICertstoreTool::Error() << "corrupt available list, possible circular reference" << endl;

				return;

				}

			Handle next=en->Link();

			if (next.IsNull())

				{

				break;

				}

			ix=next.Index();

			if (!next.Avail() || ix<=0 || ix >iHeader.iCount)

				{

				DumpSWICertstoreTool::Error() << "corrupt link in toc entry " << link << endl;

				return;

				}

			en=&(*this)[ix];

			if (en->iHandle!=next)

				{

				DumpSWICertstoreTool::Error() << "corrupt link in toc entry " << link << endl;

				return;

				}

			link=next;

			}

		}

	if (avail!=0)

		{

		DumpSWICertstoreTool::Error() << "corrupt available list: free index leakage" << endl;

		}

	}

ostream& operator<<(ostream& aStream,Toc const& aToc)

	{

	Toc::Head const& head=aToc.iHeader;

	aStream << "Toc at " << aToc.iPos << " with ";

	aStream << dec << head.iCount << (head.iCount==1 ? " entry: " : " entries: ") \

		<< head.iCount-aToc.iAvail  << " allocated, " << aToc.iAvail << " free\n" << hex;

	return aStream << flush;

	}

// Class Stream

int Stream::Length() const

	{

	int total=0;

	Frames::Iterator f=iFrame;

	do	{

		int len=f->iDes.Length();

		if (len==0)

		len=f[1].iPos.Pos()-f[0].iPos.Pos();

		total+=len;

		} while ((++f)->iDes.Type()==FrameDes::Continuation);

	return total;

	}

void* Stream::Load(istream& aStream) const

	{

	int size = Length();

	void* data = malloc(size);

	if (data==NULL)

		{

		throw ENotAPermanentFileStore;

		}

	char* read=reinterpret_cast<char*>(data);

	Frames::Iterator f = iFrame;

	do

		{

		FramePos pos=f->iPos;

		int len=f++->iDes.Length();

		if (len==0)

		{

		len=f->iPos.Pos()-pos.Pos();

		}

		aStream.seekg(FileOffset(pos).Offset(),ios::beg);

		aStream.read(read,len);

		read+=len;

		} while (f->iDes.Type()==FrameDes::Continuation);

	return data;

	}

// Class Frames

Frames::Frames()

	: iSize(0),iElements(0),iRep(NULL)

	{}

Frames::~Frames()

	{

	free(iRep);

	}

void Frames::Add(FramePos aPos,FrameDes aDes)

	{

	if (iElements==iSize)

		{

		iSize=iSize==0 ? 128 : iSize+iSize;

		void* rep=realloc(iRep,iSize*sizeof(*iRep));

		if (rep==NULL)

			{

			throw ENotAPermanentFileStore;

			}

		iRep=(Element*)rep;

		}

	Element& element=iRep[iElements++];

	element.iPos=aPos;

	element.iDes=aDes;

	}

void Frames::Complete()

// add a terminating entry

	{

	Add(0,0);

	--iElements;

	}

Frames::Iterator Frames::Find(FramePos aPos) const

	{

	return (Element const*)bsearch(&aPos,iRep,iElements,sizeof(*iRep),Compare);

	}