#ifndef BUFFER_H_

#define BUFFER_H_

#include <stdint.h>

#include <stddef.h>

/**

 * A simple struct to hold both the pointer to an array and its size,

 * for e.g. conveniently returning it from a function.

 *

 * Convention: Size is zero iff data is a NULL pointer.

 */

typedef struct {

	void *data;

	size_t size;

} flib_buffer;

/**

 * Just like flib_buffer, but the contents are not supposed to be modified.

 */

typedef struct {

	const void *data;

	size_t size;

} flib_constbuffer;

/**

 * Simple variable-capacity data structure that can be efficiently appended to.

 */

typedef struct _flib_vector flib_vector;

/**

 * Create a new vector. Needs to be destroyed again later with flib_vector_destroy.

 * May return NULL if memory runs out.

 */

flib_vector *flib_vector_create();

/**

 * Free the memory of this vector

 */

void flib_vector_destroy(flib_vector *vec);

/**

 * Resize the vector. This changes the size, and ensures the capacity is large enough to

 * for the new size. Can also free memory if the new size is smaller. There is no guarantee

 * about the contents of extra memory.

 */

int flib_vector_resize(flib_vector *vec, size_t newSize);

/**

 * Append the provided data to the end of the vector, enlarging it as required.

 * Returns the ammount of data appended, which is either len (success) or 0 (out of memory).

 * The vector remains unchanged if appending fails.

 */

int flib_vector_append(flib_vector *vec, const void *data, size_t len);

/**

 * Return a pointer to the current data buffer of the vector. This pointer can

 * become invalid if the vector size or capacity is changed.

 */

void *flib_vector_data(flib_vector *vec);

/**

 * Return the current size of the vector.

 */

size_t flib_vector_size(flib_vector *vec);

/**

 * Return a buffer pointing to the current contents of the vector.

 * These will become invalid if the vector size or capacity is changed.

 */

flib_buffer flib_vector_as_buffer(flib_vector *vec);

/**

 * Return a constbuffer pointing to the current contents of the vector.

 * These will become invalid if the vector size or capacity is changed.

 */

flib_constbuffer flib_vector_as_constbuffer(flib_vector *vec);

#endif