/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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 *************************************************************/


#ifndef ZIPFILE_HXX_INCLUDED
#define ZIPFILE_HXX_INCLUDED

#ifndef _WINDOWS
#define _WINDOWS
#endif


#include <external/zlib/unzip.h>


#include <string>
#include <vector>
#include <memory>

/** A simple zip content provider based on the zlib
*/

class ZipFile
{
public:

	typedef std::vector<std::string>   Directory_t;
	typedef std::auto_ptr<Directory_t> DirectoryPtr_t;
	typedef std::vector<char>		   ZipContentBuffer_t;

public:
	
	/** Checks whether a file is a zip file or not

	@precond	The given parameter must be a string with length > 0
			The file must exist
			The file must be readable for the current user
			
	@returns	true if the file is a zip file 
			false if the file is not a zip file
			
	@throws	ParameterException if the given file name is empty 
			IOException if the specified file doesn't exist
			AccessViolationException if read access to the file is denied			
	*/
	static bool IsZipFile(const std::string& FileName);

	static bool IsZipFile(void* stream);

	
	/** Returns wheter the version of the specified zip file may be uncompressed with the
	      currently used zlib version or not
	      
	@precond	The given parameter must be a string with length > 0
			The file must exist
			The file must be readable for the current user
			The file must be a valid zip file
			
	@returns	true if the file may be uncompressed with the currently used zlib
			false if the file may not be uncompressed with the currently used zlib
			
	@throws	ParameterException if the given file name is empty 
			IOException if the specified file doesn't exist or is no zip file
			AccessViolationException if read access to the file is denied			
	*/
	static bool IsValidZipFileVersionNumber(const std::string& FileName);
		
	static bool IsValidZipFileVersionNumber(void* stream);

public:
	
	/** Constructs a zip file from a zip file
	
	@precond	The given parameter must be a string with length > 0
			The file must exist
			The file must be readable for the current user
			
	@throws	ParameterException if the given file name is empty 
			IOException if the specified file doesn't exist or is no valid zip file
			AccessViolationException if read access to the file is denied
			WrongZipVersionException if the zip file cannot be uncompressed 
			with the used zlib version
	*/
	ZipFile(const std::string& FileName);

	ZipFile(void* stream, zlib_filefunc_def* fa);

		
	/** Destroys a zip file
	*/
	~ZipFile();
		
	/** Provides an interface to read the uncompressed data of a content of the zip file
	
	@param		ContentName
				The name of the content in the zip file 

	@param		ppstm
				Pointer to pointer, will receive an interface pointer
				to IUnknown on success

	@precond	The specified content must exist in this file
				ppstm must not be NULL

	@throws		std::bad_alloc if the necessary buffer could not be 
				allocated
				ZipException if an zip error occurs
				ZipContentMissException if the specified zip content
				does not exist in this zip file
	*/
	void GetUncompressedContent(const std::string& ContentName, /*inout*/ ZipContentBuffer_t& ContentBuffer);
		
	/** Returns a list with the content names contained within this file
		
		@throws ZipException if an error in the zlib happens
	*/
	DirectoryPtr_t GetDirectory() const;

	/** Convinience query function may even realized with 
		iterating over a ZipFileDirectory returned by
		GetDirectory
	*/
	bool HasContent(const std::string& ContentName) const;

private:

	/** Returns the length of the longest file name
		in the current zip file

		@throws ZipException if an zip error occurs
	*/
	long GetFileLongestFileNameLength() const;
	
private:
	unzFile m_uzFile;
};

#endif