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--2017  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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	__out	nt_stat *		stat,
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	__in	uint32_t		infolen,
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	__out	uintptr_t *		buffer,
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	__in	uint32_t		buffer_size,
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	__in	uint32_t		flags)
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{
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	int32_t			status;
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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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	wchar16_t *		wch;
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	wchar16_t *		wch_mark;
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	wchar16_t *		wch_cap;
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	uint32_t		hash;
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	uint32_t		written;
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	/* validation */
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	if (infolen < sizeof(*stat))
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		return NT_STATUS_INFO_LENGTH_MISMATCH;
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	/* init */
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	__ntapi->tt_aligned_block_memset(
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		stat,0,sizeof(*stat));
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        stat->hfile           = hfile;
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        stat->dev_name_maxlen = (uint16_t)infolen - sizeof(*stat);
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	/* sigh */
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	if (buffer_size >= 65536)
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		buffer_size = 65535;
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	/* system-unique device name */
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	if ((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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		return status;
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	/* copy file info minus name */
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	__ntapi->tt_aligned_block_memcpy(
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		(uintptr_t *)stat,
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		(uintptr_t *)buffer,
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		__offsetof(nt_fai,name_info));
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	/* record volume-relative file name length */
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	fai = (nt_fai *)buffer;
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	stat->file_name_length = fai->name_info.file_name_length;
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	/* file system size information */
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	if ((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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		return status;
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	/* system-unique device name */
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	if ((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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			&written)))
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		return status;
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	sdev = (nt_unicode_string *)buffer;
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	wch  = sdev->buffer;
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	if (sdev->strlen < __DEVICE_PATH_PREFIX_LEN)
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		return NT_STATUS_NOT_SUPPORTED;
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	if ((wch[0] != '\\')
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			|| (wch[1] != 'D')
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			|| (wch[2] != 'e')
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			|| (wch[3] != 'v')
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			|| (wch[4] != 'i')
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			|| (wch[5] != 'c')
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			|| (wch[6] != 'e')
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			|| (wch[7] != '\\'))
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		return NT_STATUS_NOT_SUPPORTED;
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	if ((sdev->strlen >= __DEVICE_MUP_PREFIX_LEN)
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			&& (wch[8]=='M')
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			&& (wch[9]=='u')
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			&& (wch[10]=='p')
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			&& (wch[11]=='\\')) {
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		hash = __DEVICE_MUP_PREFIX_HASH;
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		stat->flags |= NT_STAT_MUP_DEVICE;
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		wch_mark = &wch[12];
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		wch      = wch_mark;
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		for (; *wch!='\\'; )
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			wch++;
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		wch++;
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	} else {
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		wch_mark = &wch[8];
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		wch      = wch_mark;
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		hash     = __DEVICE_PATH_PREFIX_HASH;
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	}
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	wch_cap = sdev->buffer + (sdev->strlen / sizeof(wchar16_t));
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	for (; wch
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		wch++;
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	stat->obj_name_strlen = sdev->strlen;
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	stat->obj_name_maxlen = stat->dev_name_maxlen;
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	stat->dev_name_strlen = sizeof(uint16_t) * (uint16_t)(wch - sdev->buffer);
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	stat->dev_name_hash   = __ntapi->tt_buffer_crc32(
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					hash,wch_mark,
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					sizeof(wchar16_t) * (wch - wch_mark));
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	if (!(flags & NT_STAT_DEV_NAME_COPY))
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		return NT_STATUS_SUCCESS;
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	else if (stat->dev_name_maxlen < sdev->strlen)
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		return NT_STATUS_BUFFER_TOO_SMALL;
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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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		sdev->strlen);
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	return NT_STATUS_SUCCESS;
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}