Blame src/fs/ntapi_tt_stat.c

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/********************************************************/
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/*  ntapi: Native API core library                      */
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/*  Copyright (C) 2013--2016  Z. Gilboa                 */
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/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
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/********************************************************/
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#include <ntapi/ntapi.h>
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#include <ntapi/nt_file.h>
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#include <ntapi/nt_fsctl.h>
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#include <ntapi/nt_mount.h>
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#include <ntapi/nt_stat.h>
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#include "ntapi_impl.h"
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int32_t __stdcall __ntapi_tt_stat(
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	__in	void *			hfile,
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	__in	void *			hroot	__optional,
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	__in	nt_unicode_string *	path,
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	__out	nt_stat *		stat,
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	__out	uintptr_t *		buffer,
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	__in	uint32_t		buffer_size,
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	__in	uint32_t		open_options,
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	__in	uint32_t		flags)
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{
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	int32_t			status;
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	nt_oa			oa;
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	nt_iosb			iosb;
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	nt_unicode_string *	sdev;
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	nt_fai *		fai;
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	/* validation */
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	if (!hfile && !path)
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		return NT_STATUS_INVALID_HANDLE;
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	/* hfile */
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	if (!hfile) {
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		/* oa */
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		oa.len = sizeof(nt_oa);
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		oa.root_dir = hroot;
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		oa.obj_name = path;
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		oa.obj_attr = 0;
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		oa.sec_desc = 0;
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		oa.sec_qos = 0;
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		/* open file/folder */
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		status = __ntapi->zw_open_file(
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			&hfile,
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			NT_SEC_SYNCHRONIZE | NT_FILE_READ_ATTRIBUTES | NT_FILE_READ_ACCESS,
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			&oa,
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			&iosb,
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			NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE,
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			open_options | NT_FILE_SYNCHRONOUS_IO_ALERT);
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		if (status != NT_STATUS_SUCCESS)
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			return status;
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		stat->flags_out = NT_STAT_NEW_HANDLE;
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	}
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	stat->hfile    = hfile;
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	stat->flags_in = flags;
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	/* system-unique device name */
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	status = __ntapi->zw_query_information_file(
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		hfile,
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		&iosb,
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		buffer,
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		buffer_size,
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		NT_FILE_ALL_INFORMATION);
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	if (status != NT_STATUS_SUCCESS)
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		return status;
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	/* copy file info minus name */
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	fai = (nt_fai *)buffer;
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	__ntapi->tt_aligned_block_memcpy(
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		(uintptr_t *)stat,
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		(uintptr_t *)fai,
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		((size_t)(&((nt_fai *)0)->name_info)));
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	/* record the file name length, but do not hash */
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	stat->file_name_length = fai->name_info.file_name_length;
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	stat->file_name_hash   = 0;
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	/* file system size information */
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	status = __ntapi->zw_query_volume_information_file(
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		hfile,
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		&iosb,
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		&(stat->fssi),
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		sizeof(stat->fssi),
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		NT_FILE_FS_SIZE_INFORMATION);
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	if (status != NT_STATUS_SUCCESS)
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		return status;
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	/* system-unique device name (simpler than statfs) */
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	iosb.info = 0;
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	status = __ntapi->zw_query_object(
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		hfile,
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		NT_OBJECT_NAME_INFORMATION,
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		buffer,
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		buffer_size,
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		(uint32_t *)&iosb.info);
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	if (status != NT_STATUS_SUCCESS)
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		return status;
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	sdev = (nt_unicode_string *)buffer;
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	stat->dev_name_strlen = sdev->strlen - (uint16_t)stat->file_name_length;
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	stat->dev_name_hash = __ntapi->tt_buffer_crc32(
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		0,
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		sdev->buffer,
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		stat->dev_name_strlen);
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	if (flags & NT_STAT_DEV_NAME_COPY) {
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		if (stat->dev_name_maxlen < sdev->strlen)
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			/* does not justify failure */
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			*stat->dev_name = 0;
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		else
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			__ntapi->tt_memcpy_utf16(
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				(wchar16_t *)stat->dev_name,
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				(wchar16_t *)sdev->buffer,
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				stat->dev_name_strlen);
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	} else
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		*stat->dev_name = 0;
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	return status;
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}