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#ifndef _RESOURCE_H_
#define _RESOURCE_H_

/**
 * @file
 *
 * Test Resource API
 *
 * Each test can require and use some external resources. Usually, an external
 * resource is a file or a filesystem sub-hierarchy. A resource is included
 * inside the test executable.
 */

#include <sys/queue.h>
#include <stdio.h>
#include <stddef.h>

#include <rte_eal.h>
#include <rte_common.h>

TAILQ_HEAD(resource_list, resource);
extern struct resource_list resource_list;

/**
 * Representation of a resource. It points to the resource's binary data.
 * The semantics of the binary data are defined by the target test.
 */
struct resource {
	const char *name;  /**< Unique name of the resource */
	const char *begin; /**< Start of resource data */
	const char *end;   /**< End of resource data */
	TAILQ_ENTRY(resource) next;
};

/**
 * @return size of the given resource
 */
size_t resource_size(const struct resource *r);

/**
 * Find a resource by name in the global list of resources.
 */
const struct resource *resource_find(const char *name);

/**
 * Write the raw data of the resource to the given file.
 * @return 0 on success
 */
int resource_fwrite(const struct resource *r, FILE *f);

/**
 * Write the raw data of the resource to the given file given by name.
 * The name is relative to the current working directory.
 * @return 0 on success
 */
int resource_fwrite_file(const struct resource *r, const char *fname);

/**
 * Treat the given resource as a tar archive. Extract
 * the archive to the current directory.
 */
int resource_untar(const struct resource *res);

/**
 * Treat the given resource as a tar archive. Remove
 * all files (related to the current directory) listed
 * in the tar archive.
 */
int resource_rm_by_tar(const struct resource *res);

/**
 * Register a resource in the global list of resources.
 * Not intended for direct use, please check the REGISTER_RESOURCE
 * macro.
 */
void resource_register(struct resource *r);

/**
 * Definition of a resource linked externally (by means of the used toolchain).
 * Only the base name of the resource is expected. The name refers to the
 * linked pointers beg_<name> and end_<name> provided externally.
 */
#define REGISTER_LINKED_RESOURCE(n) \
extern const char beg_ ##n;         \
extern const char end_ ##n;         \
REGISTER_RESOURCE(n, &beg_ ##n, &end_ ##n) \

/**
 * Definition of a resource described by its name, and pointers begin, end.
 */
#define REGISTER_RESOURCE(n, b, e) \
static struct resource linkres_ ##n = {       \
	.name = RTE_STR(n),     \
	.begin = b,             \
	.end = e,               \
};                              \
static void __attribute__((constructor, used)) resinitfn_ ##n(void) \
{                               \
	resource_register(&linkres_ ##n);  \
}

#endif