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

/*  ntapi: Native API core library                      */

/*  Copyright (C) 2013--2021  Z. Gilboa                 */

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

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

#include <psxtypes/psxtypes.h>

#include <pemagine/pemagine.h>

#include <dalist/dalist.h>

#include <ntapi/ntapi.h>

#include "ntapi_impl.h"

struct callback_ctx {

	struct dalist_ex *	ldr_state_snapshot;

	int32_t			status;

};

static int __cdecl __add_module_base_address_to_list(

	struct pe_ldr_tbl_entry *	ldr_tbl_entry,

	enum pe_callback_reason		int_callback_reason,

	void *				context)

{

	struct dalist_node *	node;

	struct callback_ctx *	ctx;

	ctx = (struct callback_ctx *)context;

	if (int_callback_reason == PE_CALLBACK_REASON_ERROR) {

		ctx->status = NT_STATUS_UNSUCCESSFUL;

		return ctx->status;

	} else if (int_callback_reason != PE_CALLBACK_REASON_ITEM) {

		ctx->status = NT_STATUS_SUCCESS;

		return 1;

	} else if (!ldr_tbl_entry->dll_base) {

		ctx->status = NT_STATUS_SUCCESS;

		return 1;

	}

	ctx->status = dalist_get_node_by_key(

		ctx->ldr_state_snapshot,

		(struct dalist_node_ex **)&node,

		(uintptr_t)ldr_tbl_entry->dll_base,

		DALIST_NODE_TYPE_NEW,

		0);

	if (ctx->status != DALIST_OK)

		return -1;

	else

		return 1;

}

int __cdecl __ntapi_ldr_create_state_snapshot(

	__out	struct dalist_ex * ldr_state_snapshot)

{

	struct callback_ctx ctx;

	if (!ldr_state_snapshot->free && !ldr_state_snapshot->memfn_ptr)

		return NT_STATUS_BUFFER_TOO_SMALL;

	else if (ldr_state_snapshot->info.list_nodes)

		return NT_STATUS_INVALID_USER_BUFFER;

	ctx.ldr_state_snapshot = ldr_state_snapshot;

	pe_enum_modules_in_load_order(

		__add_module_base_address_to_list,

		&ctx;;

	return ctx.status;

}