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

/*  tpax: a topological pax implementation                    */

/*  Copyright (C) 2020--2021  SysDeer Technologies, LLC       */

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

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

#ifndef TPAX_DRIVER_IMPL_H

#define TPAX_DRIVER_IMPL_H

#include <stdint.h>

#include <dirent.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_DIRENT_BUFLEN 65536

#define TPAX_FILEIO_BUFLEN (4096 * 1024)

#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_dirent {

	int                           fdat;

	int                           depth;

	size_t                        nsize;

	const struct tpax_dirent *    parent;

	struct dirent                 dirent;

};

struct tpax_dirent_buffer {

	struct tpax_dirent_buffer *   next;

	size_t                        size;

	size_t                        nfree;

	struct tpax_dirent *          cdent;

	struct tpax_dirent            dbuf[];

};

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];

	struct tpax_dirent_buffer *   dirents;

	void *                        dirbuff;

	void *                        bufaddr;

	size_t                        bufsize;

	off_t                         cpos;

};

struct tpax_unit_ctx_impl {

	const char *		path;

	struct tpax_unit_ctx	uctx;

	struct stat		st;

	off_t			hpos;

	off_t			dpos;

	const char *		link;

	char			linkbuf[1024];

	size_t			hdrbuf[];

};

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 struct tpax_unit_ctx_impl * tpax_get_unit_ictx(

	const struct tpax_unit_ctx * uctx)

{

	struct tpax_unit_ctx_impl *	ictx;

	uintptr_t			addr;

	addr = (uintptr_t)uctx - offsetof(struct tpax_unit_ctx_impl,uctx);

	ictx = (struct tpax_unit_ctx_impl *)addr;

	return ictx;

}

static inline void * tpax_get_driver_anon_map_addr(

	const struct tpax_driver_ctx * dctx,

	size_t *                       size)

{

	struct tpax_driver_ctx_impl * ictx = tpax_get_driver_ictx(dctx);

	*size = ictx->bufsize;

	return ictx->bufaddr;

}

static inline void * tpax_get_driver_getdents_buffer(

	const struct tpax_driver_ctx * dctx)

{

	struct tpax_driver_ctx_impl * ictx = tpax_get_driver_ictx(dctx);

	return ictx->dirbuff;

}

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;

}

static inline off_t tpax_get_driver_cpos(const struct tpax_driver_ctx * dctx)

{

	struct tpax_driver_ctx_impl * ictx;

	ictx = tpax_get_driver_ictx(dctx);

	return ictx->cpos;

}

static inline void tpax_set_driver_cpos(const struct tpax_driver_ctx * dctx, off_t cpos)

{

	struct tpax_driver_ctx_impl * ictx;

	ictx = tpax_get_driver_ictx(dctx);

	ictx->cpos = cpos;

}

static inline struct tpax_dirent_buffer * tpax_get_driver_dirents(const struct tpax_driver_ctx * dctx)

{

	struct tpax_driver_ctx_impl * ictx;

	ictx = tpax_get_driver_ictx(dctx);

	return ictx->dirents;

}

static inline off_t tpax_get_unit_hpos(const struct tpax_unit_ctx * uctx)

{

	struct tpax_unit_ctx_impl * ictx;

	ictx = tpax_get_unit_ictx(uctx);

	return ictx->hpos;

}

static inline void tpax_set_unit_hpos(const struct tpax_unit_ctx * uctx, off_t hpos)

{

	struct tpax_unit_ctx_impl * ictx;

	ictx = tpax_get_unit_ictx(uctx);

	ictx->hpos = hpos;

}

static inline off_t tpax_get_unit_dpos(const struct tpax_unit_ctx * uctx)

{

	struct tpax_unit_ctx_impl * ictx;

	ictx = tpax_get_unit_ictx(uctx);

	return ictx->dpos;

}

static inline void tpax_set_unit_dpos(const struct tpax_unit_ctx * uctx, off_t dpos)

{

	struct tpax_unit_ctx_impl * ictx;

	ictx = tpax_get_unit_ictx(uctx);

	ictx->dpos = dpos;

}

static inline ssize_t tpax_get_archive_block_size(const struct tpax_driver_ctx * dctx)

{

	if (dctx->cctx->drvflags & TPAX_DRIVER_WRITE_FORMAT_PAX)

		return TPAX_PAX_BLOCK_SIZE;

	else if (dctx->cctx->drvflags & TPAX_DRIVER_WRITE_FORMAT_CPIO)

		return TPAX_CPIO_BLOCK_SIZE;

	else if (dctx->cctx->drvflags & TPAX_DRIVER_WRITE_FORMAT_USTAR)

		return TPAX_USTAR_BLOCK_SIZE;

	else if (dctx->cctx->drvflags & TPAX_DRIVER_WRITE_FORMAT_RUSTAR)

		return TPAX_USTAR_BLOCK_SIZE;

	else

		return 0;

}

#endif