dolphin/Source/Core/DiscIO/Src/FileHandlerARC.cpp

// Copyright (C) 2003-2008 Dolphin Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/

#include "stdafx.h"
#include "Common.h"

#include "FileHandlerARC.h"
#include "StringUtil.h"


#define ARC_ID 0x55aa382d

namespace DiscIO
{
CARCFile::CARCFile(const u8* _pBuffer, size_t _BufferSize)
	: m_pBuffer(NULL),
	m_Initialized(false)
{
	m_pBuffer = new u8[_BufferSize];

	if (m_pBuffer)
	{
		memcpy(m_pBuffer, _pBuffer, _BufferSize);
		m_Initialized = ParseBuffer();
	}
}


CARCFile::~CARCFile()
{
	delete [] m_pBuffer;
}


bool
CARCFile::IsInitialized()
{
	return(m_Initialized);
}


size_t
CARCFile::GetFileSize(const std::string& _rFullPath)
{
	if (!m_Initialized)
	{
		return(0);
	}

	const SFileInfo* pFileInfo = FindFileInfo(_rFullPath);

	if (pFileInfo != NULL)
	{
		return(pFileInfo->m_FileSize);
	}

	return(0);
}


size_t
CARCFile::ReadFile(const std::string& _rFullPath, u8* _pBuffer, size_t _MaxBufferSize)
{
	if (!m_Initialized)
	{
		return(0);
	}

	const SFileInfo* pFileInfo = FindFileInfo(_rFullPath);

	if (pFileInfo == NULL)
	{
		return(0);
	}

	if (pFileInfo->m_FileSize > _MaxBufferSize)
	{
		return(0);
	}

	memcpy(_pBuffer, &m_pBuffer[pFileInfo->m_Offset], pFileInfo->m_FileSize);
	return(pFileInfo->m_FileSize);
}


bool
CARCFile::ExportFile(const std::string& _rFullPath, const std::string& _rExportFilename)
{
	if (!m_Initialized)
	{
		return(false);
	}

	const SFileInfo* pFileInfo = FindFileInfo(_rFullPath);

	if (pFileInfo == NULL)
	{
		return(false);
	}

	FILE* pFile = fopen(_rExportFilename.c_str(), "wb");

	if (pFile == NULL)
	{
		return(false);
	}

	fwrite(&m_pBuffer[pFileInfo->m_Offset], pFileInfo->m_FileSize, 1, pFile);
	fclose(pFile);
	return(true);
}


bool
CARCFile::ExportAllFiles(const std::string& _rFullPath)
{
	return(false);
}


bool
CARCFile::ParseBuffer()
{
	// check ID
	u32 ID = Common::swap32(*(u32*)(m_pBuffer));

	if (ID != ARC_ID)
	{
		return(false);
	}

	// read header
	u32 FSTOffset  = Common::swap32(*(u32*)(m_pBuffer + 0x4));
	//u32 FSTSize    = Common::swap32(*(u32*)(m_pBuffer + 0x8));
	//u32 FileOffset = Common::swap32(*(u32*)(m_pBuffer + 0xC));

	// read all file infos
	SFileInfo Root;
	Root.m_NameOffset = Common::swap32(*(u32*)(m_pBuffer + FSTOffset + 0x0));
	Root.m_Offset     = Common::swap32(*(u32*)(m_pBuffer + FSTOffset + 0x4));
	Root.m_FileSize   = Common::swap32(*(u32*)(m_pBuffer + FSTOffset + 0x8));

	if (Root.IsDirectory())
	{
		m_FileInfoVector.resize(Root.m_FileSize);
		const char* szNameTable = (char*)(m_pBuffer + FSTOffset);

		for (size_t i = 0; i < m_FileInfoVector.size(); i++)
		{
			u8* Offset = m_pBuffer + FSTOffset + (i * 0xC);
			m_FileInfoVector[i].m_NameOffset = Common::swap32(*(u32*)(Offset + 0x0));
			m_FileInfoVector[i].m_Offset   = Common::swap32(*(u32*)(Offset + 0x4));
			m_FileInfoVector[i].m_FileSize = Common::swap32(*(u32*)(Offset + 0x8));

			szNameTable += 0xC;
		}

		BuildFilenames(1, m_FileInfoVector.size(), NULL, szNameTable);
	}

	return(true);
}


size_t
CARCFile::BuildFilenames(const size_t _FirstIndex, const size_t _LastIndex, const char* _szDirectory, const char* _szNameTable)
{
	size_t CurrentIndex = _FirstIndex;

	while (CurrentIndex < _LastIndex)
	{
		SFileInfo& rFileInfo = m_FileInfoVector[CurrentIndex];
		int uOffset = rFileInfo.m_NameOffset & 0xFFFFFF;

		// check next index
		if (rFileInfo.IsDirectory())
		{
			// this is a directory, build up the new szDirectory
			if (_szDirectory != NULL)
			{
				rFileInfo.m_FullPath = StringFromFormat("%s%s\\", _szDirectory, &_szNameTable[uOffset]);
			}
			else
			{
				rFileInfo.m_FullPath = StringFromFormat("%s\\", &_szNameTable[uOffset]);
			}

			CurrentIndex = BuildFilenames(CurrentIndex + 1, rFileInfo.m_FileSize, rFileInfo.m_FullPath.c_str(), _szNameTable);
		}
		else
		{
			// this is a filename
			if (_szDirectory != NULL)
			{
				rFileInfo.m_FullPath = StringFromFormat("%s%s", _szDirectory, &_szNameTable[uOffset]);
			}
			else
			{
				rFileInfo.m_FullPath = StringFromFormat("%s", &_szNameTable[uOffset]);
			}

			CurrentIndex++;
		}
	}

	return(CurrentIndex);
}


const CARCFile::SFileInfo*
CARCFile::FindFileInfo(std::string _rFullPath) const
{
	for (size_t i = 0; i < m_FileInfoVector.size(); i++)
	{
		if (!strcasecmp(m_FileInfoVector[i].m_FullPath.c_str(), _rFullPath.c_str()))
		{
			return(&m_FileInfoVector[i]);
		}
	}

	return(NULL);
}
} // namespace