1 \ *****************************************************************************
2 \ * Copyright (c) 2004, 2008 IBM Corporation
3 \ * All rights reserved.
4 \ * This program and the accompanying materials
5 \ * are made available under the terms of the BSD License
6 \ * which accompanies this distribution, and is available at
7 \ * http://www.opensource.org/licenses/bsd-license.php
10 \ * IBM Corporation - initial implementation
11 \ ****************************************************************************/
14 s" fat-files" device-name
16 INSTANCE VARIABLE bytes/sector
17 INSTANCE VARIABLE sectors/cluster
18 INSTANCE VARIABLE #reserved-sectors
19 INSTANCE VARIABLE #fats
20 INSTANCE VARIABLE #root-entries
21 INSTANCE VARIABLE fat32-root-cluster
22 INSTANCE VARIABLE total-#sectors
23 INSTANCE VARIABLE media-descriptor
24 INSTANCE VARIABLE sectors/fat
25 INSTANCE VARIABLE sectors/track
26 INSTANCE VARIABLE #heads
27 INSTANCE VARIABLE #hidden-sectors
29 INSTANCE VARIABLE fat-type
30 INSTANCE VARIABLE bytes/cluster
31 INSTANCE VARIABLE fat-offset
32 INSTANCE VARIABLE root-offset
33 INSTANCE VARIABLE cluster-offset
34 INSTANCE VARIABLE #clusters
36 : seek s" seek" $call-parent ;
37 : read s" read" $call-parent ;
39 INSTANCE VARIABLE data
40 INSTANCE VARIABLE #data
43 data @ ?dup IF #data @ free-mem 0 data ! THEN ;
44 : read-data ( offset size -- )
45 free-data dup #data ! alloc-mem data !
46 xlsplit seek -2 and ABORT" fat-files read-data: seek failed"
47 data @ #data @ read #data @ <> ABORT" fat-files read-data: read failed" ;
49 CREATE fat-buf 8 allot
50 : read-fat ( cluster# -- data )
52 1 #split fat-type @ * 2/ 2/ fat-offset @ +
53 xlsplit seek -2 and ABORT" fat-files read-fat: seek failed"
54 fat-buf 8 read 8 <> ABORT" fat-files read-fat: read failed"
55 fat-buf 8c@ bxjoin fat-type @ dup >r 2* #split drop r> #split
56 rot IF swap THEN drop ;
58 INSTANCE VARIABLE next-cluster
60 : read-cluster ( cluster# -- )
61 dup bytes/cluster @ * cluster-offset @ + bytes/cluster @ read-data
62 read-fat dup #clusters @ >= IF drop 0 THEN next-cluster ! ;
64 : read-dir ( cluster# -- )
67 fat32-root-cluster @ read-cluster
69 root-offset @ #root-entries @ 20 * read-data 0 next-cluster !
78 b #split 2 0.r [char] : emit 5 #split 2 0.r [char] : emit 2* 2 0.r
82 9 #split 7bc + 4 0.r [char] - emit 5 #split 2 0.r [char] - emit 2 0.r
85 6 0 DO dup 1 and IF s" RHSLDA" drop i + c@ ELSE bl THEN emit u2/ LOOP drop ;
86 : .dir-entry ( adr -- )
87 dup 0b + c@ 8 and IF drop EXIT THEN \ volume label, not a file
88 dup c@ e5 = IF drop EXIT THEN \ deleted file
90 dup 1a + 2c@ bwjoin [char] # emit 4 0.r space \ starting cluster
91 dup 18 + 2c@ bwjoin .date space
92 dup 16 + 2c@ bwjoin .time space
93 dup 1c + 4c@ bljoin base @ decimal swap a .r base ! space \ size in bytes
94 dup 0b + c@ .attr space
95 dup 8 BEGIN 2dup 1- + c@ 20 = over and WHILE 1- REPEAT type
96 dup 8 + 3 BEGIN 2dup 1- + c@ 20 = over and WHILE 1- REPEAT dup IF
97 [char] . emit type ELSE 2drop THEN
99 : .dir-entries ( adr n -- )
100 0 ?DO dup i 20 * + dup c@ 0= IF drop LEAVE THEN .dir-entry LOOP drop ;
101 : .dir ( cluster# -- )
102 read-dir BEGIN data @ #data @ 20 / .dir-entries next-cluster @ WHILE
103 next-cluster @ read-cluster REPEAT ;
105 : str-upper ( str len adr -- ) \ Copy string to adr, uppercase
106 -rot bounds ?DO i c@ upc over c! char+ LOOP drop ;
107 CREATE dos-name b allot
108 : make-dos-name ( str len -- )
110 2dup [char] . findchar IF
111 3dup 1+ /string 3 min dos-name 8 + str-upper nip THEN
112 8 min dos-name str-upper ;
114 : (find-file) ( -- cluster file-len is-dir? true | false )
115 data @ BEGIN dup data @ #data @ + < WHILE
116 dup dos-name b comp WHILE 20 + REPEAT
117 dup 1a + 2c@ bwjoin swap dup 1c + 4c@ bljoin swap 0b + c@ 10 and 0<> true
118 ELSE drop false THEN ;
119 : find-file ( dir-cluster name len -- cluster file-len is-dir? true | false )
120 make-dos-name read-dir BEGIN (find-file) 0= WHILE next-cluster @ WHILE
121 next-cluster @ read-cluster REPEAT false ELSE true THEN ;
122 : find-path ( dir-cluster name len -- cluster file-len true | false )
123 dup 0= IF 3drop false ." empty name " EXIT THEN
124 over c@ [char] \ = IF 1 /string RECURSE EXIT THEN
125 [char] \ split 2>r find-file 0= IF 2r> 2drop false ." not found " EXIT THEN
126 r@ 0<> <> IF 2drop 2r> 2drop false ." no dir<->file match " EXIT THEN
127 r@ 0<> IF drop 2r> RECURSE EXIT THEN
132 data @ 0b + 2c@ bwjoin bytes/sector !
133 data @ 0d + c@ sectors/cluster !
134 bytes/sector @ sectors/cluster @ * bytes/cluster !
135 data @ 0e + 2c@ bwjoin #reserved-sectors !
136 data @ 10 + c@ #fats !
137 data @ 11 + 2c@ bwjoin #root-entries !
138 data @ 13 + 2c@ bwjoin total-#sectors !
139 data @ 15 + c@ media-descriptor !
140 data @ 16 + 2c@ bwjoin sectors/fat !
141 data @ 18 + 2c@ bwjoin sectors/track !
142 data @ 1a + 2c@ bwjoin #heads !
143 data @ 1c + 2c@ bwjoin #hidden-sectors !
145 \ For FAT16 and FAT32:
146 total-#sectors @ 0= IF data @ 20 + 4c@ bljoin total-#sectors ! THEN
149 sectors/fat @ 0= IF data @ 24 + 4c@ bljoin sectors/fat ! THEN
150 #root-entries @ 0= IF data @ 2c + 4c@ bljoin ELSE 0 THEN fat32-root-cluster !
152 \ XXX add other FAT32 stuff (offsets 28, 2c, 30)
154 \ Compute the number of data clusters, decide what FAT type we are.
155 total-#sectors @ #reserved-sectors @ - sectors/fat @ #fats @ * -
156 #root-entries @ 20 * bytes/sector @ // - sectors/cluster @ /
158 dup ff5 < IF drop c ELSE fff5 < IF 10 ELSE 20 THEN THEN fat-type !
159 base @ decimal base !
161 \ Starting offset of first fat.
162 #reserved-sectors @ bytes/sector @ * fat-offset !
164 \ Starting offset of root dir.
165 #fats @ sectors/fat @ * bytes/sector @ * fat-offset @ + root-offset !
167 \ Starting offset of "cluster 0".
168 #root-entries @ 20 * bytes/sector @ tuck // * root-offset @ +
169 bytes/cluster @ 2* - cluster-offset ! ;
172 INSTANCE VARIABLE file-cluster
173 INSTANCE VARIABLE file-len
174 INSTANCE VARIABLE current-pos
175 INSTANCE VARIABLE pos-in-data
177 : seek ( lo hi -- status )
178 lxjoin dup current-pos ! file-cluster @ read-cluster
179 \ Read and skip blocks until we are where we want to be.
180 BEGIN dup #data @ >= WHILE #data @ - next-cluster @ dup 0= IF
181 2drop true EXIT THEN read-cluster REPEAT pos-in-data ! false ;
182 : read ( adr len -- actual )
183 file-len @ current-pos @ - min \ can't go past end of file
184 #data @ pos-in-data @ - min >r \ length for this transfer
185 data @ pos-in-data @ + swap r@ move \ move the data
186 r@ pos-in-data +! r@ current-pos +! pos-in-data @ #data @ = IF
187 next-cluster @ ?dup IF read-cluster 0 pos-in-data ! THEN THEN r> ;
188 : read ( adr len -- actual )
189 file-len @ min \ len cannot be greater than file size
190 dup >r BEGIN dup WHILE 2dup read dup 0= ABORT" fat-files: read failed"
191 /string ( tuck - >r + r> ) REPEAT 2drop r> ;
192 : load ( adr -- len )
193 file-len @ read dup file-len @ <> ABORT" fat-files: failed loading file" ;
198 0 my-args find-path 0= IF close false EXIT THEN
199 file-len ! file-cluster ! 0 0 seek 0= ;