fix, LFN search on redirected drive should not read plus size (ecm)

 imported from https://hg.pushbx.org/ecm/edrdos/rev/7616ed590558

drdos/header.asm

@@ -1367,6 +1367,10 @@ lfn_find_handle_heap_free:
 lfnpathflag:
 	db 0
 
+	Public lfn_search_redir
+lfn_search_redir:
+	db 0
+
 PCMODE_CODE ends
 
 PCM_CODEND	segment public para 'CODE'

drdos/lfn.asm

@@ -39,7 +39,7 @@ PCMODE_CODE	segment public word 'DATA'
 	extrn lfn_find_handle_heap_end:word
 	extrn lfn_find_handle_heap_free:word
 	extrn lfnpathflag:byte
-;	extrn lfn_search_redir:byte
+	extrn lfn_search_redir:byte
 PCMODE_CODE	ends
 
 BDOS_CODE	segment public word 'CODE'
@@ -381,7 +381,7 @@ f714e_entry:
 	mov	FD_FUNC,ax
 ;	mov	FD_LFNSEARCH,1		; use FAT+/LFN extensions
 	mov	fdos_pb+10,1		; use FAT+/LFN extensions
-	mov	lfnpathflag, 1
+	mov	word ptr lfnpathflag, 1
 	push	di			; handle
 	push	ds
 	push	ss:dma_segment		; save old DTA
@@ -434,7 +434,10 @@ f714f_10:
 	xor	ax,ax			; zero high dword
 	stosw
 	stosw
+	rol	ss:lfn_search_redir, 1
+	jc	f714F_redir_no_plus_size
 	mov	al,[si-7]		; extended file size
+f714F_redir_no_plus_size:
 	stosw
 	xor	ax,ax
 	stosw

drdos/redir.asm

@@ -58,7 +58,7 @@ title 'REDIR - DOS file system network redirector interace support'
 ;    ENDLOG
 
 PCMCODE	GROUP	BDOS_CODE
-PCMDATA	GROUP	PCMODE_DATA
+PCMDATA	GROUP	PCMODE_DATA,PCMODE_CODE
 
 ASSUME DS:PCMDATA
 
@@ -102,6 +102,10 @@ PCMODE_DATA	segment public word 'DATA'
 
 PCMODE_DATA	ends
 
+PCMODE_CODE	segment public word 'DATA'
+	extrn lfn_search_redir:byte
+PCMODE_CODE	ends
+
 BDOS_CODE	segment public byte 'CODE'
 
 	Public	islocal
@@ -280,6 +284,7 @@ redir_accept:
 ;============
 ; We have decided to accept an FDOS function.
 ; Note by this time the functions have been validated as legal
+	mov	lfn_search_redir, 0FFh
 	mov	file_attrib,16h		; default search attribs to all
 	pop	si			; discard the near return address
 	mov	si,2[bp]		; SI -> parameter block