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// FuncObjs.h - An STL Iterator for the Internet Explorer Cache

// Copyright 2000 by Samir Bajaj

//

// NOTES

//     This file contains the implementation of function objects

//     to illustrate the use of cache_iterator with STL algorithms.



#include "CacheIter.h"



template <typename T>
struct always_true: public std::unary_function<T, bool>
{
    bool operator()(T) { return true; }
};

struct display_cache_entry
{
    void operator()(INTERNET_CACHE_ENTRY_INFO CacheEntryInfo) const
    {
        if (CacheEntryInfo.lpszLocalFileName)
            std::cout << CacheEntryInfo.lpszLocalFileName << std::endl; 
    }
};

struct cache_file_size: std::binary_function<size_t, INTERNET_CACHE_ENTRY_INFO, size_t>
{
	size_t operator()(size_t n, INTERNET_CACHE_ENTRY_INFO CacheEntryInfo)
	{
        if (CacheEntryInfo.lpszLocalFileName)
        {
            HANDLE hFile;
            if (INVALID_HANDLE_VALUE != (hFile = ::CreateFile(CacheEntryInfo.lpszLocalFileName, GENERIC_READ,
                                                              FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
                                                              OPEN_EXISTING, 0, 0)))
            {
                n += ::GetFileSize(hFile, 0);
                ::CloseHandle(hFile);
            }
        }
		return n;
	}
};