/*
 * Copyright (c) 2023 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef ZEPHYR_LLEXT_BUF_LOADER_H
#define ZEPHYR_LLEXT_BUF_LOADER_H

#include <zephyr/llext/loader.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @file
 * @brief LLEXT buffer loader implementation.
 *
 * @addtogroup llext_loader_apis
 * @{
 */

/**
 * @brief Implementation of @ref llext_loader that reads from a memory buffer.
 */
struct llext_buf_loader {
	/** Extension loader */
	struct llext_loader loader;

	/** @cond ignore */
	const uint8_t *buf;
	size_t len;
	size_t pos;
	/** @endcond */
};

/** @cond ignore */
int llext_buf_read(struct llext_loader *ldr, void *buf, size_t len);
int llext_buf_seek(struct llext_loader *ldr, size_t pos);
void *llext_buf_peek(struct llext_loader *ldr, size_t pos);
/** @endcond */

/**
 * @brief Initializer for an llext_buf_loader structure
 *
 * @param _buf Buffer containing the ELF binary
 * @param _buf_len Buffer length in bytes
 */
#define LLEXT_BUF_LOADER(_buf, _buf_len)                                                           \
	{                                                                                          \
		.loader =                                                                          \
			{                                                                          \
				.prepare = NULL,                                                   \
				.read = llext_buf_read,                                            \
				.seek = llext_buf_seek,                                            \
				.peek = llext_buf_peek,                                            \
				.finalize = NULL,                                                  \
			},                                                                         \
		.buf = (_buf),                                                                     \
		.len = (_buf_len),                                                                 \
		.pos = 0,                                                                          \
	}

/**
 * @}
 */

#ifdef __cplusplus
}
#endif

#endif /* ZEPHYR_LLEXT_BUF_LOADER_H */