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\ *****************************************************************************
\ * Copyright (c) 2004, 2008 IBM Corporation
\ * All rights reserved.
\ * This program and the accompanying materials
\ * are made available under the terms of the BSD License
\ * which accompanies this distribution, and is available at
\ * http://www.opensource.org/licenses/bsd-license.php
\ *
\ * Contributors:
\ * IBM Corporation - initial implementation
\ ****************************************************************************/
s" fat-files" device-name
INSTANCE VARIABLE bytes/sector
INSTANCE VARIABLE sectors/cluster
INSTANCE VARIABLE #reserved-sectors
INSTANCE VARIABLE #fats
INSTANCE VARIABLE #root-entries
INSTANCE VARIABLE fat32-root-cluster
INSTANCE VARIABLE total-#sectors
INSTANCE VARIABLE media-descriptor
INSTANCE VARIABLE sectors/fat
INSTANCE VARIABLE sectors/track
INSTANCE VARIABLE #heads
INSTANCE VARIABLE #hidden-sectors
INSTANCE VARIABLE fat-type
INSTANCE VARIABLE bytes/cluster
INSTANCE VARIABLE fat-offset
INSTANCE VARIABLE root-offset
INSTANCE VARIABLE cluster-offset
INSTANCE VARIABLE #clusters
: seek s" seek" $call-parent ;
: read s" read" $call-parent ;
INSTANCE VARIABLE data
INSTANCE VARIABLE #data
: free-data
data @ ?dup IF #data @ free-mem 0 data ! THEN ;
: read-data ( offset size -- )
free-data dup #data ! alloc-mem data !
xlsplit seek -2 and ABORT" fat-files read-data: seek failed"
data @ #data @ read #data @ <> ABORT" fat-files read-data: read failed" ;
CREATE fat-buf 8 allot
: read-fat ( cluster# -- data )
fat-buf 8 erase
1 #split fat-type @ * 2/ 2/ fat-offset @ +
xlsplit seek -2 and ABORT" fat-files read-fat: seek failed"
fat-buf 8 read 8 <> ABORT" fat-files read-fat: read failed"
fat-buf 8c@ bxjoin fat-type @ dup >r 2* #split drop r> #split
rot IF swap THEN drop ;
INSTANCE VARIABLE next-cluster
: read-cluster ( cluster# -- )
dup bytes/cluster @ * cluster-offset @ + bytes/cluster @ read-data
read-fat dup #clusters @ >= IF drop 0 THEN next-cluster ! ;
: read-dir ( cluster# -- )
?dup 0= IF
#root-entries @ 0= IF
fat32-root-cluster @ read-cluster
ELSE
root-offset @ #root-entries @ 20 * read-data 0 next-cluster !
THEN
ELSE
read-cluster
THEN
;
: .time ( x -- )
base @ >r decimal
b #split 2 0.r [char] : emit 5 #split 2 0.r [char] : emit 2* 2 0.r
r> base ! ;
: .date ( x -- )
base @ >r decimal
9 #split 7bc + 4 0.r [char] - emit 5 #split 2 0.r [char] - emit 2 0.r
r> base ! ;
: .attr ( attr -- )
6 0 DO dup 1 and IF s" RHSLDA" drop i + c@ ELSE bl THEN emit u2/ LOOP drop ;
: .dir-entry ( adr -- )
dup 0b + c@ 8 and IF drop EXIT THEN \ volume label, not a file
dup c@ e5 = IF drop EXIT THEN \ deleted file
cr
dup 1a + 2c@ bwjoin [char] # emit 4 0.r space \ starting cluster
dup 18 + 2c@ bwjoin .date space
dup 16 + 2c@ bwjoin .time space
dup 1c + 4c@ bljoin base @ decimal swap a .r base ! space \ size in bytes
dup 0b + c@ .attr space
dup 8 BEGIN 2dup 1- + c@ 20 = over and WHILE 1- REPEAT type
dup 8 + 3 BEGIN 2dup 1- + c@ 20 = over and WHILE 1- REPEAT dup IF
[char] . emit type ELSE 2drop THEN
drop ;
: .dir-entries ( adr n -- )
0 ?DO dup i 20 * + dup c@ 0= IF drop LEAVE THEN .dir-entry LOOP drop ;
: .dir ( cluster# -- )
read-dir BEGIN data @ #data @ 20 / .dir-entries next-cluster @ WHILE
next-cluster @ read-cluster REPEAT ;
: str-upper ( str len adr -- ) \ Copy string to adr, uppercase
-rot bounds ?DO i c@ upc over c! char+ LOOP drop ;
CREATE dos-name b allot
: make-dos-name ( str len -- )
dos-name b bl fill
2dup [char] . findchar IF
3dup 1+ /string 3 min dos-name 8 + str-upper nip THEN
8 min dos-name str-upper ;
: (find-file) ( -- cluster file-len is-dir? true | false )
data @ BEGIN dup data @ #data @ + < WHILE
dup dos-name b comp WHILE 20 + REPEAT
dup 1a + 2c@ bwjoin swap dup 1c + 4c@ bljoin swap 0b + c@ 10 and 0<> true
ELSE drop false THEN ;
: find-file ( dir-cluster name len -- cluster file-len is-dir? true | false )
make-dos-name read-dir BEGIN (find-file) 0= WHILE next-cluster @ WHILE
next-cluster @ read-cluster REPEAT false ELSE true THEN ;
: find-path ( dir-cluster name len -- cluster file-len true | false )
dup 0= IF 3drop false ." empty name " EXIT THEN
over c@ [char] \ = IF 1 /string RECURSE EXIT THEN
[char] \ split 2>r find-file 0= IF 2r> 2drop false ." not found " EXIT THEN
r@ 0<> <> IF 2drop 2r> 2drop false ." no dir<->file match " EXIT THEN
r@ 0<> IF drop 2r> RECURSE EXIT THEN
2r> 2drop true ;
: do-super ( -- )
0 200 read-data
data @ 0b + 2c@ bwjoin bytes/sector !
data @ 0d + c@ sectors/cluster !
bytes/sector @ sectors/cluster @ * bytes/cluster !
data @ 0e + 2c@ bwjoin #reserved-sectors !
data @ 10 + c@ #fats !
data @ 11 + 2c@ bwjoin #root-entries !
data @ 13 + 2c@ bwjoin total-#sectors !
data @ 15 + c@ media-descriptor !
data @ 16 + 2c@ bwjoin sectors/fat !
data @ 18 + 2c@ bwjoin sectors/track !
data @ 1a + 2c@ bwjoin #heads !
data @ 1c + 2c@ bwjoin #hidden-sectors !
\ For FAT16 and FAT32:
total-#sectors @ 0= IF data @ 20 + 4c@ bljoin total-#sectors ! THEN
\ For FAT32:
sectors/fat @ 0= IF data @ 24 + 4c@ bljoin sectors/fat ! THEN
#root-entries @ 0= IF data @ 2c + 4c@ bljoin ELSE 0 THEN fat32-root-cluster !
\ XXX add other FAT32 stuff (offsets 28, 2c, 30)
\ Compute the number of data clusters, decide what FAT type we are.
total-#sectors @ #reserved-sectors @ - sectors/fat @ #fats @ * -
#root-entries @ 20 * bytes/sector @ // - sectors/cluster @ /
dup #clusters !
dup ff5 < IF drop c ELSE fff5 < IF 10 ELSE 20 THEN THEN fat-type !
base @ decimal base !
\ Starting offset of first fat.
#reserved-sectors @ bytes/sector @ * fat-offset !
\ Starting offset of root dir.
#fats @ sectors/fat @ * bytes/sector @ * fat-offset @ + root-offset !
\ Starting offset of "cluster 0".
#root-entries @ 20 * bytes/sector @ tuck // * root-offset @ +
bytes/cluster @ 2* - cluster-offset ! ;
INSTANCE VARIABLE file-cluster
INSTANCE VARIABLE file-len
INSTANCE VARIABLE current-pos
INSTANCE VARIABLE pos-in-data
: seek ( lo hi -- status )
lxjoin dup current-pos ! file-cluster @ read-cluster
\ Read and skip blocks until we are where we want to be.
BEGIN dup #data @ >= WHILE #data @ - next-cluster @ dup 0= IF
2drop true EXIT THEN read-cluster REPEAT pos-in-data ! false ;
: read ( adr len -- actual )
file-len @ current-pos @ - min \ can't go past end of file
#data @ pos-in-data @ - min >r \ length for this transfer
data @ pos-in-data @ + swap r@ move \ move the data
r@ pos-in-data +! r@ current-pos +! pos-in-data @ #data @ = IF
next-cluster @ ?dup IF read-cluster 0 pos-in-data ! THEN THEN r> ;
: read ( adr len -- actual )
file-len @ min \ len cannot be greater than file size
dup >r BEGIN dup WHILE 2dup read dup 0= ABORT" fat-files: read failed"
/string ( tuck - >r + r> ) REPEAT 2drop r> ;
: load ( adr -- len )
file-len @ read dup file-len @ <> ABORT" fat-files: failed loading file" ;
: close free-data ;
: open
do-super
0 my-args find-path 0= IF close false EXIT THEN
file-len ! file-cluster ! 0 0 seek 0= ;
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