#pragma once

#ifdef __cplusplus
extern "C" {
#endif

#include <stddef.h>
#include <stdlib.h>

typedef char*(*CmixBufferAllocator)(size_t);
typedef void(*CmixBufferDeallocator)(void*);
typedef size_t(*CmixBufferMessageLength)();

struct CmixBufferImpl {
	CmixBufferAllocator allocate_cmix_buffer;
	CmixBufferDeallocator deallocate_cmix_buffer;
	CmixBufferMessageLength message_length;
};

#define DEFINE_CIPHER(NAME, MESSAGE_SIZE)\
typedef char NAME ## Message[MESSAGE_SIZE];\
\
char* allocate_ ## NAME ## _cmix_buffer(size_t size){\
	return (char*) calloc(size, sizeof(NAME ## Message));\
}\
\
void deallocate_ ## NAME ## _cmix_buffer(void* buffer) {\
	free(buffer);\
}\
\
size_t NAME ## _message_length() {\
	return sizeof(NAME ## Message);\
}\
\
struct CmixBufferImpl get_cmix_ ## NAME ## _buffer_implementation() {\
	return (struct CmixBufferImpl) {\
		allocate_ ## NAME ## _cmix_buffer,\
		deallocate_ ## NAME ## _cmix_buffer,\
		NAME ## _message_length\
	};\
}

DEFINE_CIPHER(Null, 0)
DEFINE_CIPHER(Curve25519, 20);

#undef DEFINE_CIPHER

#ifdef __cplusplus
} // extern "C"
#endif