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

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

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

#include <stdint.h>

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_errinfo_impl.h"

static int slbt_map_raw_archive(

	const struct slbt_driver_ctx *	dctx,

	int				fd,

	const char *			path,

	int				prot,

	struct slbt_raw_archive *	map)

{

	struct slbt_input mapinfo = {0,0};

	if (slbt_map_input(dctx,fd,path,prot,&mapinfo) < 0)

		return SLBT_NESTED_ERROR(dctx);

	if (mapinfo.size == 0)

		return SLBT_CUSTOM_ERROR(

			dctx,

			SLBT_ERR_AR_EMPTY_FILE);

	map->map_addr = mapinfo.addr;

	map->map_size = mapinfo.size;

	return 0;

}

static int slbt_unmap_raw_archive(struct slbt_raw_archive * map)

{

	struct slbt_input mapinfo;

	mapinfo.addr = map->map_addr;

	mapinfo.size = map->map_size;

	return slbt_unmap_input(&mapinfo);

}

static int slbt_free_archive_ctx_impl(struct slbt_archive_ctx_impl * ctx, int ret)

{

	if (ctx) {

		slbt_free_archive_meta(ctx->meta);

		slbt_unmap_raw_archive(&ctx->map);

		free(ctx);

	}

	return ret;

}

int slbt_get_archive_ctx(

	const struct slbt_driver_ctx *	dctx,

	const char *			path,

	struct slbt_archive_ctx **		pctx)

{

	struct slbt_archive_ctx_impl *	ctx;

	int				prot;

	if (!(ctx = calloc(1,sizeof(*ctx))))

		return SLBT_BUFFER_ERROR(dctx);

	slbt_driver_set_arctx(

		dctx,0,path);

	prot = (dctx->cctx->actflags & SLBT_ACTION_MAP_READWRITE)

		? PROT_READ | PROT_WRITE

		: PROT_READ;

	if (slbt_map_raw_archive(dctx,-1,path,prot,&ctx->map))

		return slbt_free_archive_ctx_impl(ctx,

			SLBT_NESTED_ERROR(dctx));

	if (slbt_get_archive_meta(dctx,&ctx->map,&ctx->meta))

		return slbt_free_archive_ctx_impl(ctx,

			SLBT_NESTED_ERROR(dctx));

	ctx->path	= path;

	ctx->actx.path	= &ctx->path;

	ctx->actx.map	= &ctx->map;

	ctx->actx.meta	= ctx->meta;

	*pctx = &ctx->actx;

	return 0;

}

void slbt_free_archive_ctx(struct slbt_archive_ctx * ctx)

{

	struct slbt_archive_ctx_impl *	ictx;

	uintptr_t			addr;

	if (ctx) {

		addr = (uintptr_t)ctx - offsetof(struct slbt_archive_ctx_impl,actx);

		ictx = (struct slbt_archive_ctx_impl *)addr;

		slbt_free_archive_ctx_impl(ictx,0);

	}

}