--- /dev/null
+\ *****************************************************************************
+\ * 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 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-offset @ #root-entries @ 20 * read-data 0 next-cluster !
+ 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
+
+ \ 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= ;
Code Review / kvmfornfv.git / blobdiff