/* Groestl hash from https://github.com/Groestlcoin/vanitygen
 * Trezor adaptation by Yura Pakhuchiy <pakhuchiy@gmail.com>. */
/**
 * Basic type definitions.
 *
 * This header file defines the generic integer types that will be used
 * for the implementation of hash functions; it also contains helper
 * functions which encode and decode multi-byte integer values, using
 * either little-endian or big-endian conventions.
 *
 * This file contains a compile-time test on the size of a byte
 * (the <code>unsigned char</code> C type). If bytes are not octets,
 * i.e. if they do not have a size of exactly 8 bits, then compilation
 * is aborted. Architectures where bytes are not octets are relatively
 * rare, even in the embedded devices market. We forbid non-octet bytes
 * because there is no clear convention on how octet streams are encoded
 * on such systems.
 *
 * ==========================(LICENSE BEGIN)============================
 *
 * Copyright (c) 2007-2010  Projet RNRT SAPHIR
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * ===========================(LICENSE END)=============================
 *
 * @file     sph_types.h
 * @author   Thomas Pornin <thomas.pornin@cryptolog.com>
 */

#ifndef GROESTL_INTERNAL_H__
#define GROESTL_INTERNAL_H__

#include <limits.h>

/*
 * All our I/O functions are defined over octet streams. We do not know
 * how to handle input data if bytes are not octets.
 */
#if CHAR_BIT != 8
#error This code requires 8-bit bytes
#endif

#if defined __STDC__ && __STDC_VERSION__ >= 199901L

#include <stdint.h>

typedef uint32_t sph_u32;
typedef int32_t sph_s32;
typedef uint64_t sph_u64;
typedef int64_t sph_s64;

#define SPH_C32(x)    ((sph_u32)(x))
#define SPH_C64(x)    ((sph_u64)(x))

#else
#error We need at least C99 compiler
#endif

#define SPH_T32(x)    ((x) & SPH_C32(0xFFFFFFFF))
#define SPH_ROTL32(x, n)   SPH_T32(((x) << (n)) | ((x) >> (32 - (n))))
#define SPH_ROTR32(x, n)   SPH_ROTL32(x, (32 - (n)))

#define SPH_T64(x)    ((x) & SPH_C64(0xFFFFFFFFFFFFFFFF))
#define SPH_ROTL64(x, n)   SPH_T64(((x) << (n)) | ((x) >> (64 - (n))))
#define SPH_ROTR64(x, n)   SPH_ROTL64(x, (64 - (n)))

/*
 * 32-bit x86, aka "i386 compatible".
 */
#if defined __i386__ || defined _M_IX86

#define SPH_DETECT_LITTLE_ENDIAN     1
#define SPH_DETECT_BIG_ENDIAN        0

/*
 * 64-bit x86, hereafter known as "amd64".
 */
#elif defined __x86_64 || defined _M_X64

#define SPH_DETECT_LITTLE_ENDIAN     1
#define SPH_DETECT_BIG_ENDIAN        0

/*
 * ARM, little-endian.
 */
#elif defined __arm__ && __ARMEL__

#define SPH_DETECT_LITTLE_ENDIAN     1
#define SPH_DETECT_BIG_ENDIAN        0

#endif


#if defined SPH_DETECT_LITTLE_ENDIAN && !defined SPH_LITTLE_ENDIAN
#define SPH_LITTLE_ENDIAN     SPH_DETECT_LITTLE_ENDIAN
#endif
#if defined SPH_DETECT_BIG_ENDIAN && !defined SPH_BIG_ENDIAN
#define SPH_BIG_ENDIAN        SPH_DETECT_BIG_ENDIAN
#endif

static inline sph_u32
sph_bswap32(sph_u32 x)
{
	x = SPH_T32((x << 16) | (x >> 16));
	x = ((x & SPH_C32(0xFF00FF00)) >> 8)
		| ((x & SPH_C32(0x00FF00FF)) << 8);
	return x;
}

/**
 * Byte-swap a 64-bit value.
 *
 * @param x   the input value
 * @return  the byte-swapped value
 */
static inline sph_u64
sph_bswap64(sph_u64 x)
{
	x = SPH_T64((x << 32) | (x >> 32));
	x = ((x & SPH_C64(0xFFFF0000FFFF0000)) >> 16)
		| ((x & SPH_C64(0x0000FFFF0000FFFF)) << 16);
	x = ((x & SPH_C64(0xFF00FF00FF00FF00)) >> 8)
		| ((x & SPH_C64(0x00FF00FF00FF00FF)) << 8);
	return x;
}

static inline void
sph_enc16be(void *dst, unsigned val)
{
	((unsigned char *)dst)[0] = (val >> 8);
	((unsigned char *)dst)[1] = val;
}

static inline unsigned
sph_dec16be(const void *src)
{
	return ((unsigned)(((const unsigned char *)src)[0]) << 8)
		| (unsigned)(((const unsigned char *)src)[1]);
}

static inline void
sph_enc16le(void *dst, unsigned val)
{
	((unsigned char *)dst)[0] = val;
	((unsigned char *)dst)[1] = val >> 8;
}

static inline unsigned
sph_dec16le(const void *src)
{
	return (unsigned)(((const unsigned char *)src)[0])
		| ((unsigned)(((const unsigned char *)src)[1]) << 8);
}

/**
 * Encode a 32-bit value into the provided buffer (big endian convention).
 *
 * @param dst   the destination buffer
 * @param val   the 32-bit value to encode
 */
static inline void
sph_enc32be(void *dst, sph_u32 val)
{
	((unsigned char *)dst)[0] = (val >> 24);
	((unsigned char *)dst)[1] = (val >> 16);
	((unsigned char *)dst)[2] = (val >> 8);
	((unsigned char *)dst)[3] = val;
}

/**
 * Encode a 32-bit value into the provided buffer (big endian convention).
 * The destination buffer must be properly aligned.
 *
 * @param dst   the destination buffer (32-bit aligned)
 * @param val   the value to encode
 */
static inline void
sph_enc32be_aligned(void *dst, sph_u32 val)
{
#if SPH_LITTLE_ENDIAN
	*(sph_u32 *)dst = sph_bswap32(val);
#elif SPH_BIG_ENDIAN
	*(sph_u32 *)dst = val;
#else
	((unsigned char *)dst)[0] = (val >> 24);
	((unsigned char *)dst)[1] = (val >> 16);
	((unsigned char *)dst)[2] = (val >> 8);
	((unsigned char *)dst)[3] = val;
#endif
}

/**
 * Decode a 32-bit value from the provided buffer (big endian convention).
 *
 * @param src   the source buffer
 * @return  the decoded value
 */
static inline sph_u32
sph_dec32be(const void *src)
{
	return ((sph_u32)(((const unsigned char *)src)[0]) << 24)
		| ((sph_u32)(((const unsigned char *)src)[1]) << 16)
		| ((sph_u32)(((const unsigned char *)src)[2]) << 8)
		| (sph_u32)(((const unsigned char *)src)[3]);
}

/**
 * Decode a 32-bit value from the provided buffer (big endian convention).
 * The source buffer must be properly aligned.
 *
 * @param src   the source buffer (32-bit aligned)
 * @return  the decoded value
 */
static inline sph_u32
sph_dec32be_aligned(const void *src)
{
#if SPH_LITTLE_ENDIAN
	return sph_bswap32(*(const sph_u32 *)src);
#elif SPH_BIG_ENDIAN
	return *(const sph_u32 *)src;
#else
	return ((sph_u32)(((const unsigned char *)src)[0]) << 24)
		| ((sph_u32)(((const unsigned char *)src)[1]) << 16)
		| ((sph_u32)(((const unsigned char *)src)[2]) << 8)
		| (sph_u32)(((const unsigned char *)src)[3]);
#endif
}

/**
 * Encode a 32-bit value into the provided buffer (little endian convention).
 *
 * @param dst   the destination buffer
 * @param val   the 32-bit value to encode
 */
static inline void
sph_enc32le(void *dst, sph_u32 val)
{
	((unsigned char *)dst)[0] = val;
	((unsigned char *)dst)[1] = (val >> 8);
	((unsigned char *)dst)[2] = (val >> 16);
	((unsigned char *)dst)[3] = (val >> 24);
}

/**
 * Encode a 32-bit value into the provided buffer (little endian convention).
 * The destination buffer must be properly aligned.
 *
 * @param dst   the destination buffer (32-bit aligned)
 * @param val   the value to encode
 */
static inline void
sph_enc32le_aligned(void *dst, sph_u32 val)
{
#if SPH_LITTLE_ENDIAN
	*(sph_u32 *)dst = val;
#elif SPH_BIG_ENDIAN
	*(sph_u32 *)dst = sph_bswap32(val);
#else
	((unsigned char *)dst)[0] = val;
	((unsigned char *)dst)[1] = (val >> 8);
	((unsigned char *)dst)[2] = (val >> 16);
	((unsigned char *)dst)[3] = (val >> 24);
#endif
}

/**
 * Decode a 32-bit value from the provided buffer (little endian convention).
 *
 * @param src   the source buffer
 * @return  the decoded value
 */
static inline sph_u32
sph_dec32le(const void *src)
{
	return (sph_u32)(((const unsigned char *)src)[0])
		| ((sph_u32)(((const unsigned char *)src)[1]) << 8)
		| ((sph_u32)(((const unsigned char *)src)[2]) << 16)
		| ((sph_u32)(((const unsigned char *)src)[3]) << 24);
}

/**
 * Decode a 32-bit value from the provided buffer (little endian convention).
 * The source buffer must be properly aligned.
 *
 * @param src   the source buffer (32-bit aligned)
 * @return  the decoded value
 */
static inline sph_u32
sph_dec32le_aligned(const void *src)
{
#if SPH_LITTLE_ENDIAN
	return *(const sph_u32 *)src;
#elif SPH_BIG_ENDIAN
	return sph_bswap32(*(const sph_u32 *)src);
#else
	return (sph_u32)(((const unsigned char *)src)[0])
		| ((sph_u32)(((const unsigned char *)src)[1]) << 8)
		| ((sph_u32)(((const unsigned char *)src)[2]) << 16)
		| ((sph_u32)(((const unsigned char *)src)[3]) << 24);
#endif
}

/**
 * Encode a 64-bit value into the provided buffer (big endian convention).
 *
 * @param dst   the destination buffer
 * @param val   the 64-bit value to encode
 */
static inline void
sph_enc64be(void *dst, sph_u64 val)
{
	((unsigned char *)dst)[0] = (val >> 56);
	((unsigned char *)dst)[1] = (val >> 48);
	((unsigned char *)dst)[2] = (val >> 40);
	((unsigned char *)dst)[3] = (val >> 32);
	((unsigned char *)dst)[4] = (val >> 24);
	((unsigned char *)dst)[5] = (val >> 16);
	((unsigned char *)dst)[6] = (val >> 8);
	((unsigned char *)dst)[7] = val;
}

/**
 * Encode a 64-bit value into the provided buffer (big endian convention).
 * The destination buffer must be properly aligned.
 *
 * @param dst   the destination buffer (64-bit aligned)
 * @param val   the value to encode
 */
static inline void
sph_enc64be_aligned(void *dst, sph_u64 val)
{
#if SPH_LITTLE_ENDIAN
	*(sph_u64 *)dst = sph_bswap64(val);
#elif SPH_BIG_ENDIAN
	*(sph_u64 *)dst = val;
#else
	((unsigned char *)dst)[0] = (val >> 56);
	((unsigned char *)dst)[1] = (val >> 48);
	((unsigned char *)dst)[2] = (val >> 40);
	((unsigned char *)dst)[3] = (val >> 32);
	((unsigned char *)dst)[4] = (val >> 24);
	((unsigned char *)dst)[5] = (val >> 16);
	((unsigned char *)dst)[6] = (val >> 8);
	((unsigned char *)dst)[7] = val;
#endif
}

/**
 * Decode a 64-bit value from the provided buffer (big endian convention).
 *
 * @param src   the source buffer
 * @return  the decoded value
 */
static inline sph_u64
sph_dec64be(const void *src)
{
	return ((sph_u64)(((const unsigned char *)src)[0]) << 56)
		| ((sph_u64)(((const unsigned char *)src)[1]) << 48)
		| ((sph_u64)(((const unsigned char *)src)[2]) << 40)
		| ((sph_u64)(((const unsigned char *)src)[3]) << 32)
		| ((sph_u64)(((const unsigned char *)src)[4]) << 24)
		| ((sph_u64)(((const unsigned char *)src)[5]) << 16)
		| ((sph_u64)(((const unsigned char *)src)[6]) << 8)
		| (sph_u64)(((const unsigned char *)src)[7]);
}

/**
 * Decode a 64-bit value from the provided buffer (big endian convention).
 * The source buffer must be properly aligned.
 *
 * @param src   the source buffer (64-bit aligned)
 * @return  the decoded value
 */
static inline sph_u64
sph_dec64be_aligned(const void *src)
{
#if SPH_LITTLE_ENDIAN
	return sph_bswap64(*(const sph_u64 *)src);
#elif SPH_BIG_ENDIAN
	return *(const sph_u64 *)src;
#else
	return ((sph_u64)(((const unsigned char *)src)[0]) << 56)
		| ((sph_u64)(((const unsigned char *)src)[1]) << 48)
		| ((sph_u64)(((const unsigned char *)src)[2]) << 40)
		| ((sph_u64)(((const unsigned char *)src)[3]) << 32)
		| ((sph_u64)(((const unsigned char *)src)[4]) << 24)
		| ((sph_u64)(((const unsigned char *)src)[5]) << 16)
		| ((sph_u64)(((const unsigned char *)src)[6]) << 8)
		| (sph_u64)(((const unsigned char *)src)[7]);
#endif
}

/**
 * Encode a 64-bit value into the provided buffer (little endian convention).
 *
 * @param dst   the destination buffer
 * @param val   the 64-bit value to encode
 */
static inline void
sph_enc64le(void *dst, sph_u64 val)
{
	((unsigned char *)dst)[0] = val;
	((unsigned char *)dst)[1] = (val >> 8);
	((unsigned char *)dst)[2] = (val >> 16);
	((unsigned char *)dst)[3] = (val >> 24);
	((unsigned char *)dst)[4] = (val >> 32);
	((unsigned char *)dst)[5] = (val >> 40);
	((unsigned char *)dst)[6] = (val >> 48);
	((unsigned char *)dst)[7] = (val >> 56);
}

/**
 * Encode a 64-bit value into the provided buffer (little endian convention).
 * The destination buffer must be properly aligned.
 *
 * @param dst   the destination buffer (64-bit aligned)
 * @param val   the value to encode
 */
static inline void
sph_enc64le_aligned(void *dst, sph_u64 val)
{
#if SPH_LITTLE_ENDIAN
	*(sph_u64 *)dst = val;
#elif SPH_BIG_ENDIAN
	*(sph_u64 *)dst = sph_bswap64(val);
#else
	((unsigned char *)dst)[0] = val;
	((unsigned char *)dst)[1] = (val >> 8);
	((unsigned char *)dst)[2] = (val >> 16);
	((unsigned char *)dst)[3] = (val >> 24);
	((unsigned char *)dst)[4] = (val >> 32);
	((unsigned char *)dst)[5] = (val >> 40);
	((unsigned char *)dst)[6] = (val >> 48);
	((unsigned char *)dst)[7] = (val >> 56);
#endif
}

/**
 * Decode a 64-bit value from the provided buffer (little endian convention).
 *
 * @param src   the source buffer
 * @return  the decoded value
 */
static inline sph_u64
sph_dec64le(const void *src)
{
	return (sph_u64)(((const unsigned char *)src)[0])
		| ((sph_u64)(((const unsigned char *)src)[1]) << 8)
		| ((sph_u64)(((const unsigned char *)src)[2]) << 16)
		| ((sph_u64)(((const unsigned char *)src)[3]) << 24)
		| ((sph_u64)(((const unsigned char *)src)[4]) << 32)
		| ((sph_u64)(((const unsigned char *)src)[5]) << 40)
		| ((sph_u64)(((const unsigned char *)src)[6]) << 48)
		| ((sph_u64)(((const unsigned char *)src)[7]) << 56);
}

/**
 * Decode a 64-bit value from the provided buffer (little endian convention).
 * The source buffer must be properly aligned.
 *
 * @param src   the source buffer (64-bit aligned)
 * @return  the decoded value
 */
static inline sph_u64
sph_dec64le_aligned(const void *src)
{
#if SPH_LITTLE_ENDIAN
	return *(const sph_u64 *)src;
#elif SPH_BIG_ENDIAN
	return sph_bswap64(*(const sph_u64 *)src);
#else
	return (sph_u64)(((const unsigned char *)src)[0])
		| ((sph_u64)(((const unsigned char *)src)[1]) << 8)
		| ((sph_u64)(((const unsigned char *)src)[2]) << 16)
		| ((sph_u64)(((const unsigned char *)src)[3]) << 24)
		| ((sph_u64)(((const unsigned char *)src)[4]) << 32)
		| ((sph_u64)(((const unsigned char *)src)[5]) << 40)
		| ((sph_u64)(((const unsigned char *)src)[6]) << 48)
		| ((sph_u64)(((const unsigned char *)src)[7]) << 56);
#endif
}

#endif