// -*- mode: c; tab-width: 8; indent-tabs-mode: 1; st-rulers: [70] -*-
// vim: ts=8 sw=8 ft=c noet

#include "libsodium_api_crypto_core_salsa2012.h"

static void	LS_API_EXEC(crypto_core_salsa2012, outputbytes);
static void	LS_API_EXEC(crypto_core_salsa2012, inputbytes);
static void	LS_API_EXEC(crypto_core_salsa2012, keybytes);
static void	LS_API_EXEC(crypto_core_salsa2012, constbytes);
static int	LS_API_INIT(crypto_core_salsa2012, crypto_core_salsa2012);
static void	LS_API_EXEC(crypto_core_salsa2012, crypto_core_salsa2012);

libsodium_function_t	libsodium_functions_crypto_core_salsa2012[] = {
	LS_API_R_ARG0(crypto_core_salsa2012, outputbytes),
	LS_API_R_ARG0(crypto_core_salsa2012, inputbytes),
	LS_API_R_ARG0(crypto_core_salsa2012, keybytes),
	LS_API_R_ARG0(crypto_core_salsa2012, constbytes),
	LS_API_R_ARGV(crypto_core_salsa2012, crypto_core_salsa2012, 3),
	{NULL}
};

/* crypto_core_salsa2012_outputbytes/0 */

static void
LS_API_EXEC(crypto_core_salsa2012, outputbytes)
{
	size_t outputbytes;

	outputbytes = crypto_core_salsa2012_outputbytes();

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_UINT, (ErlDrvUInt)(outputbytes),
		ERL_DRV_TUPLE, 2
	};

	LS_RESPOND(request, spec, __FILE__, __LINE__);
}

/* crypto_core_salsa2012_inputbytes/0 */

static void
LS_API_EXEC(crypto_core_salsa2012, inputbytes)
{
	size_t inputbytes;

	inputbytes = crypto_core_salsa2012_inputbytes();

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_UINT, (ErlDrvUInt)(inputbytes),
		ERL_DRV_TUPLE, 2
	};

	LS_RESPOND(request, spec, __FILE__, __LINE__);
}

/* crypto_core_salsa2012_keybytes/0 */

static void
LS_API_EXEC(crypto_core_salsa2012, keybytes)
{
	size_t keybytes;

	keybytes = crypto_core_salsa2012_keybytes();

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_UINT, (ErlDrvUInt)(keybytes),
		ERL_DRV_TUPLE, 2
	};

	LS_RESPOND(request, spec, __FILE__, __LINE__);
}

/* crypto_core_salsa2012_constbytes/0 */

static void
LS_API_EXEC(crypto_core_salsa2012, constbytes)
{
	size_t constbytes;

	constbytes = crypto_core_salsa2012_constbytes();

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_UINT, (ErlDrvUInt)(constbytes),
		ERL_DRV_TUPLE, 2
	};

	LS_RESPOND(request, spec, __FILE__, __LINE__);
}

/* crypto_core_salsa2012_crypto_core_salsa2012/2 */

typedef struct LS_API_F_ARGV(crypto_core_salsa2012, crypto_core_salsa2012) {
	const unsigned char	*in;
	const unsigned char	*k;
	const unsigned char	*c;
} LS_API_F_ARGV_T(crypto_core_salsa2012, crypto_core_salsa2012);

static int
LS_API_INIT(crypto_core_salsa2012, crypto_core_salsa2012)
{
	LS_API_F_ARGV_T(crypto_core_salsa2012, crypto_core_salsa2012) *argv;
	int skip;
	int type;
	int type_length;
	size_t inputbytes;
	size_t keybytes;
	size_t constbytes;
	ErlDrvSizeT x;
	void *p;

	inputbytes = crypto_core_salsa2012_inputbytes();

	if (ei_get_type(buffer, index, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT
			|| type_length != inputbytes) {
		return -1;
	}

	skip = *index;

	if (ei_skip_term(buffer, &skip) < 0) {
		return -1;
	}

	keybytes = crypto_core_salsa2012_keybytes();

	if (ei_get_type(buffer, &skip, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT
			|| type_length != keybytes) {
		return -1;
	}

	if (ei_skip_term(buffer, &skip) < 0) {
		return -1;
	}

	constbytes = crypto_core_salsa2012_constbytes();

	if (ei_get_type(buffer, &skip, &type, &type_length) < 0
			|| type != ERL_BINARY_EXT
			|| type_length != constbytes) {
		return -1;
	}

	x = (ErlDrvSizeT)(inputbytes + keybytes + constbytes + (sizeof (LS_API_F_ARGV_T(crypto_core_salsa2012, crypto_core_salsa2012))));
	p = (void *)(driver_alloc(x));

	if (p == NULL) {
		return -1;
	}

	argv = (LS_API_F_ARGV_T(crypto_core_salsa2012, crypto_core_salsa2012) *)(p);
	p += (sizeof (LS_API_F_ARGV_T(crypto_core_salsa2012, crypto_core_salsa2012)));
	argv->in = (const unsigned char *)(p);
	p += inputbytes;
	argv->k = (const unsigned char *)(p);
	p += keybytes;
	argv->c = (const unsigned char *)(p);

	if (ei_decode_binary(buffer, index, (void *)(argv->in), NULL) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_decode_binary(buffer, index, (void *)(argv->k), NULL) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	if (ei_decode_binary(buffer, index, (void *)(argv->c), NULL) < 0) {
		(void) driver_free(argv);
		return -1;
	}

	request->argv = (void *)(argv);

	return 0;
}

static void
LS_API_EXEC(crypto_core_salsa2012, crypto_core_salsa2012)
{
	LS_API_F_ARGV_T(crypto_core_salsa2012, crypto_core_salsa2012) *argv;
	LS_API_READ_ARGV(crypto_core_salsa2012, crypto_core_salsa2012);
	size_t outputbytes;
	unsigned char *out;

	outputbytes = crypto_core_salsa2012_outputbytes();
	out = (unsigned char *)(driver_alloc((ErlDrvSizeT)(outputbytes)));

	if (out == NULL) {
		LS_FAIL_OOM(request->port->drv_port);
		return;
	}

	(void) crypto_core_salsa2012(out, argv->in, argv->k, argv->c);

	ErlDrvTermData spec[] = {
		LS_RES_TAG(request),
		ERL_DRV_BUF2BINARY, (ErlDrvTermData)(out), outputbytes,
		ERL_DRV_TUPLE, 2
	};

	LS_RESPOND(request, spec, __FILE__, __LINE__);

	(void) driver_free(out);
}