//------------------------------------------------------------------------------
/*
    Copyright (c) 2011-2013, OpenCoin, Inc.
*/
//==============================================================================

#ifndef RIPPLE_HASHUTILITIES_H
#define RIPPLE_HASHUTILITIES_H

// VFALCO NOTE these came from BitcoinUtil.h

// VFALCO TODO Rewrite the callers so we don't need templates,
//         then define these in a .cpp so they are no longer inline.
//
template<typename T1>
inline uint256 SHA256Hash (const T1 pbegin, const T1 pend)
{
    static unsigned char pblank[1];
    uint256 hash1;
    SHA256 ((pbegin == pend ? pblank : (unsigned char*)&pbegin[0]), (pend - pbegin) * sizeof (pbegin[0]), (unsigned char*)&hash1);
    uint256 hash2;
    SHA256 ((unsigned char*)&hash1, sizeof (hash1), (unsigned char*)&hash2);
    return hash2;
}

template<typename T1, typename T2>
inline uint256 SHA256Hash (const T1 p1begin, const T1 p1end,
                           const T2 p2begin, const T2 p2end)
{
    static unsigned char pblank[1];
    uint256 hash1;
    SHA256_CTX ctx;
    SHA256_Init (&ctx);
    SHA256_Update (&ctx, (p1begin == p1end ? pblank : (unsigned char*)&p1begin[0]), (p1end - p1begin) * sizeof (p1begin[0]));
    SHA256_Update (&ctx, (p2begin == p2end ? pblank : (unsigned char*)&p2begin[0]), (p2end - p2begin) * sizeof (p2begin[0]));
    SHA256_Final ((unsigned char*)&hash1, &ctx);
    uint256 hash2;
    SHA256 ((unsigned char*)&hash1, sizeof (hash1), (unsigned char*)&hash2);
    return hash2;
}

template<typename T1, typename T2, typename T3>
inline uint256 SHA256Hash (const T1 p1begin, const T1 p1end,
                           const T2 p2begin, const T2 p2end,
                           const T3 p3begin, const T3 p3end)
{
    static unsigned char pblank[1];
    uint256 hash1;
    SHA256_CTX ctx;
    SHA256_Init (&ctx);
    SHA256_Update (&ctx, (p1begin == p1end ? pblank : (unsigned char*)&p1begin[0]), (p1end - p1begin) * sizeof (p1begin[0]));
    SHA256_Update (&ctx, (p2begin == p2end ? pblank : (unsigned char*)&p2begin[0]), (p2end - p2begin) * sizeof (p2begin[0]));
    SHA256_Update (&ctx, (p3begin == p3end ? pblank : (unsigned char*)&p3begin[0]), (p3end - p3begin) * sizeof (p3begin[0]));
    SHA256_Final ((unsigned char*)&hash1, &ctx);
    uint256 hash2;
    SHA256 ((unsigned char*)&hash1, sizeof (hash1), (unsigned char*)&hash2);
    return hash2;
}

inline uint160 Hash160 (Blob const& vch)
{
    uint256 hash1;
    SHA256 (&vch[0], vch.size (), (unsigned char*)&hash1);
    uint160 hash2;
    RIPEMD160 ((unsigned char*)&hash1, sizeof (hash1), (unsigned char*)&hash2);
    return hash2;
}

/*
#ifdef WIN32
// This is used to attempt to keep keying material out of swap
// Note that VirtualLock does not provide this as a guarantee on Windows,
// but, in practice, memory that has been VirtualLock'd almost never gets written to
// the pagefile except in rare circumstances where memory is extremely low.
#include <windows.h>
#define mlock(p, n) VirtualLock((p), (n));
#define munlock(p, n) VirtualUnlock((p), (n));
#else
#include <sys/mman.h>
#include <limits.h>
// This comes from limits.h if it's not defined there set a sane default
#ifndef PAGESIZE
#include <unistd.h>
#define PAGESIZE sysconf(_SC_PAGESIZE)
#endif
#define mlock(a,b) \
    mlock(((void *)(((size_t)(a)) & (~((PAGESIZE)-1)))),\
    (((((size_t)(a)) + (b) - 1) | ((PAGESIZE) - 1)) + 1) - (((size_t)(a)) & (~((PAGESIZE) - 1))))
#define munlock(a,b) \
    munlock(((void *)(((size_t)(a)) & (~((PAGESIZE)-1)))),\
    (((((size_t)(a)) + (b) - 1) | ((PAGESIZE) - 1)) + 1) - (((size_t)(a)) & (~((PAGESIZE) - 1))))
#endif
*/

#endif