zip_archive.cpp

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/*  $Id: zip_archive.cpp,v 1.9 2003/08/04 12:45:27 mbn Exp $
**
**  ClanLib Game SDK
**  Copyright (C) 2003  The ClanLib Team
**  For a total list of contributers see the file CREDITS.
**
**  This library is free software; you can redistribute it and/or
**  modify it under the terms of the GNU Lesser General Public
**  License as published by the Free Software Foundation; either
**  version 2.1 of the License, or (at your option) any later version.
**
**  This library 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
**  Lesser General Public License for more details.
**
**  You should have received a copy of the GNU Lesser General Public
**  License along with this library; if not, write to the Free Software
**  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/

#include "Core/precomp.h"
#include "API/Core/IOData/zip_archive.h"
#include "API/Core/IOData/inputsource_file.h"
#include "API/Core/IOData/inputsource_memory.h"
#include "API/Core/System/clanstring.h"
#include "zip_archive_generic.h"
#include "zip_file_header.h"
#include "zip_64_end_of_central_directory_record.h"
#include "zip_64_end_of_central_directory_locator.h"
#include "zip_end_of_central_directory_record.h"
#include "zip_file_entry_generic.h"
#include "inputsource_zip_fileentry.h"

/////////////////////////////////////////////////////////////////////////////
// CL_Zip_Archive construction:

CL_Zip_Archive::CL_Zip_Archive() : impl(new CL_Zip_Archive_Generic)
{
	impl->add_ref();
}
	
CL_Zip_Archive::CL_Zip_Archive(const std::string &filename) : impl(new CL_Zip_Archive_Generic)
{
	impl->add_ref();
	
	impl->filename = filename;

	// Load zip file structures:

	CL_InputSource *input = new CL_InputSource_File(filename);
	
	// Find end of central directory record:

	int size_file = input->size();
	
	char buffer[32*1024];
	if (size_file > 32*1024) input->seek(-32*1024, CL_InputSource::seek_end);
	int size_buffer = input->read(buffer, 32*1024);
	
	int end_record_pos = -1;
	for (int pos = size_buffer-4; pos >= 0; pos--)
	{
		if (*(unsigned int *)(buffer+pos) == 0x06054b50)
		{
			end_record_pos = size_file-size_buffer+pos;
			input->tell();
			break;
		}
	}
	if (end_record_pos == -1)
	{
		delete input;
		throw CL_Error("This appear not to be a zip file");
	}
	
	// Load end of central directory record:
	
	CL_Zip_EndOfCentralDirectoryRecord end_of_directory;
	input->seek(end_record_pos, CL_InputSource::seek_set);
	end_of_directory.load(input);
	
	// Look for zip64 central directory locator:
	
	bool zip64 = false;
	CL_Zip_64EndOfCentralDirectoryLocator zip64_locator;
	CL_Zip_64EndOfCentralDirectoryRecord zip64_end_of_directory;
	
	int end64_locator = end_record_pos-20;
	input->seek(end64_locator, CL_InputSource::seek_set);
	if (input->read_uint32() == 0x07064b50)
	{
		// Load zip64 structures:
		
		input->seek(end64_locator, CL_InputSource::seek_set);
		zip64_locator.load(input);
		
		input->seek(end64_locator+zip64_locator.relative_offset_of_zip64_end_of_central_directory, CL_InputSource::seek_set);
		zip64_end_of_directory.load(input);
		
		zip64 = true;
	}
	
	// Load central directory records:
	
	if (zip64) input->seek(zip64_end_of_directory.offset_to_start_of_central_directory, CL_InputSource::seek_set);
	else input->seek(end_of_directory.offset_to_start_of_central_directory, CL_InputSource::seek_set);
	
	cl_int64 num_entries = end_of_directory.number_of_entries_in_central_directory;
	if (zip64) num_entries = zip64_end_of_directory.number_of_entries_in_central_directory;

	for (int i=0; i<num_entries; i++)
	{
		CL_Zip_FileEntry entry;
		entry.impl->record.load(input);
		impl->files.push_back(entry);
	}

	delete input;
}

CL_Zip_Archive::CL_Zip_Archive(const CL_Zip_Archive &copy) : impl(copy.impl)
{
	impl->add_ref();
}
	
CL_Zip_Archive::~CL_Zip_Archive()
{
	impl->release_ref();
}

/////////////////////////////////////////////////////////////////////////////
// CL_Zip_Archive attributes:

std::vector<CL_Zip_FileEntry> &CL_Zip_Archive::get_file_list()
{
	return impl->files;
}

/////////////////////////////////////////////////////////////////////////////
// CL_Zip_Archive operations:

CL_Zip_Archive &CL_Zip_Archive::operator =(const CL_Zip_Archive &copy)
{
	impl->release_ref();
	impl = copy.impl;
	impl->add_ref();
	return *this;
}

CL_InputSource *CL_Zip_Archive::open_source(const std::string &filename)
{
	int size = impl->files.size();
	for (int i=0; i<size; i++)
	{
		CL_Zip_FileEntry &entry = impl->files[i];
		if (entry.impl->record.filename == filename)
		{
			switch (entry.impl->type)
			{
			case CL_Zip_FileEntry_Generic::type_file:
				return new CL_InputSource_Zip_FileEntry(impl->filename, entry);

			case CL_Zip_FileEntry_Generic::type_removed:
				break;

			case CL_Zip_FileEntry_Generic::type_added_memory:
				return new CL_InputSource_Memory(entry.impl->data);

			case CL_Zip_FileEntry_Generic::type_added_file:
				return new CL_InputSource_File(entry.impl->filename);
			}
			throw CL_Error(CL_String::format("Found but hates %1", filename));
		}
	}
	throw CL_Error(CL_String::format("Unable to find zip index %1", filename));
	return 0;
}

CL_InputSourceProvider *CL_Zip_Archive::clone()
{
	return new CL_Zip_Archive(*this);
}

std::string CL_Zip_Archive::get_pathname(const std::string &filename)
{
	return filename;
}

CL_InputSourceProvider *CL_Zip_Archive::create_relative(const std::string &path)
{
	// This is wrong. Should seperate the inputsource provider from CL_Zip_Archive,
	// but don't really bother doing it right now.
	// -- mbn may 10, 2003
	return clone();
}

CL_OutputSource *CL_Zip_Archive::create_file(const std::string &filename, bool compress)
{
	return 0;
}

void CL_Zip_Archive::add_file(const std::string &filename, bool compress)
{
}

void CL_Zip_Archive::save()
{
}
	
void CL_Zip_Archive::save(const std::string &filename)
{
}

/////////////////////////////////////////////////////////////////////////////
// CL_Zip_Archive implementation: