/******************************************************/

/*  tpax: a topological pax implementation            */

/*  Copyright (C) 2020  Z. Gilboa                     */

/*  Released under GPLv2 and GPLv3; see COPYING.TPAX. */

/******************************************************/

#ifndef TPAX_DRIVER_IMPL_H

#define TPAX_DRIVER_IMPL_H

#include <stdint.h>

#include <stdio.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <tpax/tpax.h>

#include <tpax/tpax_specs.h>

#include "tpax_dprintf_impl.h"

#include "argv/argv.h"

#define TPAX_OPTV_ELEMENTS 64

#define TPAX_DRIVER_EXEC_MODE_WRITE_COPY \

	(TPAX_DRIVER_EXEC_MODE_WRITE |    \

	 TPAX_DRIVER_EXEC_MODE_COPY)

extern const struct argv_option tpax_default_options[];

enum app_tags {

	TAG_HELP,

	TAG_VERSION,

	TAG_LIST,

	TAG_READ,

	TAG_WRITE,

	TAG_COPY,

	TAG_FORMAT,

	TAG_BLKSIZE,

	TAG_RECURSE,

	TAG_NORECURSE,

	TAG_STRICT_PATH,

	TAG_PURE_PATH,

};

struct tpax_driver_ctx_impl {

	struct tpax_common_ctx        cctx;

	struct tpax_driver_ctx        ctx;

	struct tpax_fd_ctx            fdctx;

	const struct tpax_unit_ctx *  euctx;

	const char *                  eunit;

	struct tpax_error_info **     errinfp;

	struct tpax_error_info **     erricap;

	struct tpax_error_info *      erriptr[64];

	struct tpax_error_info        erribuf[64];

	void *                        bufaddr;

	size_t                        bufsize;

};

struct tpax_unit_ctx_impl {

	const char *		path;

	struct tpax_unit_ctx	uctx;

	struct stat		st;

	const char *		link;

	char			linkbuf[1024];

	union {

		struct tpax_ustar_header uhdr;

		struct tpax_cpio_header  chdr;

	} hdrbufs;

};

static inline struct tpax_driver_ctx_impl * tpax_get_driver_ictx(

	const struct tpax_driver_ctx * dctx)

{

        uintptr_t addr;

        if (dctx) {

                addr = (uintptr_t)dctx - offsetof(struct tpax_driver_ctx_impl,ctx);

                return (struct tpax_driver_ctx_impl *)addr;

        }

        return 0;

}

static inline void tpax_driver_set_ectx(

	const struct tpax_driver_ctx * dctx,

	const struct tpax_unit_ctx *   uctx,

	const char *                 unit)

{

	struct tpax_driver_ctx_impl *  ictx;

	ictx        = tpax_get_driver_ictx(dctx);

	ictx->euctx = uctx;

	ictx->eunit = unit;

}

static inline int tpax_driver_fdin(const struct tpax_driver_ctx * dctx)

{

	struct tpax_fd_ctx fdctx;

	tpax_get_driver_fdctx(dctx,&fdctx);

	return fdctx.fdin;

}

static inline int tpax_driver_fdout(const struct tpax_driver_ctx * dctx)

{

	struct tpax_fd_ctx fdctx;

	tpax_get_driver_fdctx(dctx,&fdctx);

	return fdctx.fdout;

}

static inline int tpax_driver_fderr(const struct tpax_driver_ctx * dctx)

{

	struct tpax_fd_ctx fdctx;

	tpax_get_driver_fdctx(dctx,&fdctx);

	return fdctx.fderr;

}

static inline int tpax_driver_fdlog(const struct tpax_driver_ctx * dctx)

{

	struct tpax_fd_ctx fdctx;

	tpax_get_driver_fdctx(dctx,&fdctx);

	return fdctx.fdlog;

}

static inline int tpax_driver_fdcwd(const struct tpax_driver_ctx * dctx)

{

	struct tpax_fd_ctx fdctx;

	tpax_get_driver_fdctx(dctx,&fdctx);

	return fdctx.fdcwd;

}

static inline int tpax_driver_fddst(const struct tpax_driver_ctx * dctx)

{

	struct tpax_fd_ctx fdctx;

	tpax_get_driver_fdctx(dctx,&fdctx);

	return fdctx.fddst;

}

#endif