696 lines
14 KiB
C
Executable file
696 lines
14 KiB
C
Executable file
/*
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* Io to an xdf disk
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*
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* written by:
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*
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* Alain L. Knaff
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* alain@linux.lu
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*
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*/
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#include "sysincludes.h"
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#ifdef OS_linux
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#include "msdos.h"
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#include "mtools.h"
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#include "devices.h"
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#include "xdf_io.h"
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extern int errno;
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/* Algorithms can't be patented */
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typedef struct sector_map {
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unsigned int head:1;
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unsigned int size:7;
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} sector_map_t;
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struct {
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unsigned char track_size;
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unsigned int track0_size:7;
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unsigned int rootskip:1;
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unsigned char rate;
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sector_map_t map[9];
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} xdf_table[]= {
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{
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19, 16, 0, 0,
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{ {0,3}, {0,6}, {1,2}, {0,2}, {1,6}, {1,3}, {0,0} }
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},
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{
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23, 19, 0, 0,
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{ {0,3}, {0,4}, {1,6}, {0,2}, {1,2}, {0,6}, {1,4}, {1,3}, {0,0} }
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},
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{
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46, 37, 0x43, 1,
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{ {0,3}, {0,4}, {0,5}, {0,7}, {1,3}, {1,4}, {1,5}, {1,7}, {0,0} }
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},
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{
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24, 20, 0, 1,
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{ {0,5}, {1,6}, {0,6}, {1, 5} }
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},
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{
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48, 41, 0, 1,
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{ {0,6}, {1,7}, {0,7}, {1, 6} }
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}
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};
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#define NUMBER(x) (sizeof(x)/sizeof(x[0]))
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typedef struct {
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unsigned char begin; /* where it begins */
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unsigned char end;
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unsigned char sector;
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unsigned char sizecode;
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unsigned int dirty:1;
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unsigned int phantom:2;
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unsigned int valid:1;
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unsigned int head:1;
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} TrackMap_t;
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typedef struct Xdf_t {
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Class_t *Class;
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int refs;
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Stream_t *Next;
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Stream_t *Buffer;
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int fd;
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char *buffer;
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int current_track;
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sector_map_t *map;
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int track_size;
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int track0_size;
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int sector_size;
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int FatSize;
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int RootDirSize;
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TrackMap_t *track_map;
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unsigned char last_sector;
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unsigned char rate;
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unsigned int stretch:1;
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unsigned int rootskip:1;
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signed int drive:4;
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} Xdf_t;
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typedef struct {
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unsigned char head;
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unsigned char sector;
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unsigned char ptr;
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} Compactify_t;
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static int analyze_reply(RawRequest_t *raw_cmd, int do_print)
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{
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int ret, bytes, newbytes;
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bytes = 0;
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while(1) {
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ret = analyze_one_reply(raw_cmd, &newbytes, do_print);
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bytes += newbytes;
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switch(ret) {
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case 0:
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return bytes;
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case 1:
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raw_cmd++;
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break;
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case -1:
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if(bytes)
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return bytes;
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else
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return 0;
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}
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}
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}
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static int send_cmd(int fd, RawRequest_t *raw_cmd, int nr,
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const char *message, int retries)
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{
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int j;
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int ret=-1;
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if(!nr)
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return 0;
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for (j=0; j< retries; j++){
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switch(send_one_cmd(fd, raw_cmd, message)) {
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case -1:
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return -1;
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case 1:
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j++;
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continue;
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case 0:
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break;
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}
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if((ret=analyze_reply(raw_cmd, j)) > 0)
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return ret; /* ok */
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}
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if(j > 1 && j == retries) {
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fprintf(stderr,"Too many errors, giving up\n");
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return 0;
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}
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return -1;
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}
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#define REC (This->track_map[ptr])
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#define END(x) (This->track_map[(x)].end)
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#define BEGIN(x) (This->track_map[(x)].begin)
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static int add_to_request(Xdf_t *This, int ptr,
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RawRequest_t *request, int *nr,
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int direction, Compactify_t *compactify)
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{
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#if 0
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if(direction == MT_WRITE) {
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printf("writing %d: %d %d %d %d [%02x]\n",
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ptr, This->current_track,
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REC.head, REC.sector, REC.sizecode,
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*(This->buffer + ptr * This->sector_size));
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} else
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printf(" load %d.%d\n", This->current_track, ptr);
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#endif
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if(REC.phantom) {
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if(direction== MT_READ)
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memset(This->buffer + ptr * This->sector_size, 0,
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128 << REC.sizecode);
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return 0;
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}
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if(*nr &&
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RR_SIZECODE(request+(*nr)-1) == REC.sizecode &&
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compactify->head == REC.head &&
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compactify->ptr + 1 == ptr &&
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compactify->sector +1 == REC.sector) {
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RR_SETSIZECODE(request+(*nr)-1, REC.sizecode);
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} else {
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if(*nr)
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RR_SETCONT(request+(*nr)-1);
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RR_INIT(request+(*nr));
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RR_SETDRIVE(request+(*nr), This->drive);
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RR_SETRATE(request+(*nr), This->rate);
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RR_SETTRACK(request+(*nr), This->current_track);
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RR_SETPTRACK(request+(*nr),
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This->current_track << This->stretch);
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RR_SETHEAD(request+(*nr), REC.head);
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RR_SETSECTOR(request+(*nr), REC.sector);
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RR_SETSIZECODE(request+(*nr), REC.sizecode);
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RR_SETDIRECTION(request+(*nr), direction);
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RR_SETDATA(request+(*nr),
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(caddr_t) This->buffer + ptr * This->sector_size);
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(*nr)++;
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}
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compactify->ptr = ptr;
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compactify->head = REC.head;
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compactify->sector = REC.sector;
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return 0;
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}
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static void add_to_request_if_invalid(Xdf_t *This, int ptr,
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RawRequest_t *request, int *nr,
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Compactify_t *compactify)
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{
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if(!REC.valid)
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add_to_request(This, ptr, request, nr, MT_READ, compactify);
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}
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static void adjust_bounds(Xdf_t *This, off_t *begin, off_t *end)
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{
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/* translates begin and end from byte to sectors */
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*begin = *begin / This->sector_size;
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*end = (*end + This->sector_size - 1) / This->sector_size;
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}
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static inline int try_flush_dirty(Xdf_t *This)
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{
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int ptr, nr, bytes;
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RawRequest_t requests[100];
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Compactify_t compactify;
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if(This->current_track < 0)
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return 0;
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nr = 0;
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for(ptr=0; ptr < This->last_sector; ptr=REC.end)
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if(REC.dirty)
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add_to_request(This, ptr,
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requests, &nr,
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MT_WRITE, &compactify);
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#if 1
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bytes = send_cmd(This->fd,requests, nr, "writing", 4);
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if(bytes < 0)
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return bytes;
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#else
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bytes = 0xffffff;
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#endif
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for(ptr=0; ptr < This->last_sector; ptr=REC.end)
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if(REC.dirty) {
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if(bytes >= REC.end - REC.begin) {
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bytes -= REC.end - REC.begin;
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REC.dirty = 0;
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} else
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return 1;
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}
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return 0;
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}
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static int flush_dirty(Xdf_t *This)
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{
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int ret;
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while((ret = try_flush_dirty(This))) {
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if(ret < 0)
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return ret;
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}
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return 0;
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}
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static int load_data(Xdf_t *This, off_t begin, off_t end, int retries)
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{
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int ptr, nr, bytes;
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RawRequest_t requests[100];
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Compactify_t compactify;
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adjust_bounds(This, &begin, &end);
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ptr = begin;
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nr = 0;
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for(ptr=REC.begin; ptr < end ; ptr = REC.end)
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add_to_request_if_invalid(This, ptr, requests, &nr,
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&compactify);
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bytes = send_cmd(This->fd,requests, nr, "reading", retries);
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if(bytes < 0)
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return bytes;
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ptr = begin;
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for(ptr=REC.begin; ptr < end ; ptr = REC.end) {
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if(!REC.valid) {
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if(bytes >= REC.end - REC.begin) {
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bytes -= REC.end - REC.begin;
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REC.valid = 1;
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} else if(ptr > begin)
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return ptr * This->sector_size;
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else
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return -1;
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}
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}
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return end * This->sector_size;
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}
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static void mark_dirty(Xdf_t *This, off_t begin, off_t end)
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{
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int ptr;
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adjust_bounds(This, &begin, &end);
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ptr = begin;
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for(ptr=REC.begin; ptr < end ; ptr = REC.end) {
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REC.valid = 1;
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if(!REC.phantom)
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REC.dirty = 1;
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}
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}
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static int load_bounds(Xdf_t *This, off_t begin, off_t end)
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{
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off_t lbegin, lend;
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int endp1, endp2;
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lbegin = begin;
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lend = end;
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adjust_bounds(This, &lbegin, &lend);
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if(begin != BEGIN(lbegin) * This->sector_size &&
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end != BEGIN(lend) * This->sector_size &&
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lend < END(END(lbegin)))
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/* contiguous end & begin, load them in one go */
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return load_data(This, begin, end, 4);
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if(begin != BEGIN(lbegin) * This->sector_size) {
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endp1 = load_data(This, begin, begin, 4);
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if(endp1 < 0)
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return endp1;
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}
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if(end != BEGIN(lend) * This->sector_size) {
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endp2 = load_data(This, end, end, 4);
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if(endp2 < 0)
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return BEGIN(lend) * This->sector_size;
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}
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return lend * This->sector_size;
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}
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static int fill_t0(Xdf_t *This, int ptr, int size, int *sector, int *head)
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{
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int n;
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for(n = 0; n < size; ptr++,n++) {
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REC.head = *head;
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REC.sector = *sector + 129;
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REC.phantom = 0;
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(*sector)++;
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if(!*head && *sector >= This->track0_size - 8) {
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*sector = 0;
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*head = 1;
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}
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}
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return ptr;
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}
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static int fill_phantoms(Xdf_t *This, int ptr, int size)
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{
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int n;
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for(n = 0; n < size; ptr++,n++)
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REC.phantom = 1;
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return ptr;
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}
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static void decompose(Xdf_t *This, int where, int len, off_t *begin,
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off_t *end, int boot)
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{
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int ptr, track;
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sector_map_t *map;
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int lbegin, lend;
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track = where / This->track_size / 1024;
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*begin = where - track * This->track_size * 1024;
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*end = where + len - track * This->track_size * 1024;
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maximize(*end, This->track_size * 1024);
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if(This->current_track == track && !boot)
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/* already OK, return immediately */
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return;
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if(!boot)
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flush_dirty(This);
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This->current_track = track;
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if(track) {
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for(ptr=0, map=This->map; map->size; map++) {
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/* iterate through all sectors */
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lbegin = ptr;
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lend = ptr + (128 << map->size) / This->sector_size;
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for( ; ptr < lend ; ptr++) {
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REC.begin = lbegin;
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REC.end = lend;
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REC.head = map->head;
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REC.sector = map->size + 128;
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REC.sizecode = map->size;
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REC.valid = 0;
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REC.dirty = 0;
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REC.phantom = 0;
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}
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}
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REC.begin = REC.end = ptr;
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} else {
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int sector, head;
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head = 0;
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sector = 0;
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for(ptr=boot; ptr < 2 * This->track_size; ptr++) {
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REC.begin = ptr;
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REC.end = ptr+1;
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REC.sizecode = 2;
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REC.valid = 0;
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REC.dirty = 0;
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}
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/* boot & 1st fat */
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ptr=fill_t0(This, 0, 1 + This->FatSize, §or, &head);
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/* second fat */
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ptr=fill_phantoms(This, ptr, This->FatSize);
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/* root dir */
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ptr=fill_t0(This, ptr, This->RootDirSize, §or, &head);
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/* "bad sectors" at the beginning of the fs */
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ptr=fill_phantoms(This, ptr, 5);
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if(This->rootskip)
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sector++;
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/* beginning of the file system */
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ptr = fill_t0(This, ptr,
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(This->track_size - This->FatSize) * 2 -
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This->RootDirSize - 6,
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§or, &head);
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}
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This->last_sector = ptr;
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}
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static int xdf_read(Stream_t *Stream, char *buf, mt_off_t where, size_t len)
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{
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off_t begin, end;
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size_t len2;
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DeclareThis(Xdf_t);
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decompose(This, truncBytes32(where), len, &begin, &end, 0);
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len2 = load_data(This, begin, end, 4);
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if(len2 < 0)
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return len2;
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len2 -= begin;
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maximize(len, len2);
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memcpy(buf, This->buffer + begin, len);
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return end - begin;
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}
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static int xdf_write(Stream_t *Stream, char *buf, mt_off_t where, size_t len)
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{
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off_t begin, end;
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size_t len2;
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DeclareThis(Xdf_t);
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decompose(This, truncBytes32(where), len, &begin, &end, 0);
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len2 = load_bounds(This, begin, end);
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if(len2 < 0)
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return len2;
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maximize(end, len2);
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len2 -= begin;
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maximize(len, len2);
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memcpy(This->buffer + begin, buf, len);
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mark_dirty(This, begin, end);
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return end - begin;
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}
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static int xdf_flush(Stream_t *Stream)
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{
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DeclareThis(Xdf_t);
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return flush_dirty(This);
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}
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static int xdf_free(Stream_t *Stream)
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{
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DeclareThis(Xdf_t);
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Free(This->track_map);
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Free(This->buffer);
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return close(This->fd);
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}
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static int check_geom(struct device *dev, int media, struct bootsector *boot)
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{
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int sect;
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if(media >= 0xfc && media <= 0xff)
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return 1; /* old DOS */
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if (!IS_MFORMAT_ONLY(dev)) {
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if(compare(dev->sectors, 19) &&
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compare(dev->sectors, 23) &&
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compare(dev->sectors, 24) &&
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compare(dev->sectors, 46) &&
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compare(dev->sectors, 48))
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return 1;
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/* check against contradictory info from configuration file */
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if(compare(dev->heads, 2))
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return 1;
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}
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/* check against info from boot */
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if(boot) {
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sect = WORD(nsect);
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if((sect != 19 && sect != 23 && sect != 24 &&
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sect != 46 && sect != 48) ||
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(!IS_MFORMAT_ONLY(dev) && compare(dev->sectors, sect)) ||
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WORD(nheads) !=2)
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return 1;
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}
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return 0;
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}
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static void set_geom(struct bootsector *boot, struct device *dev)
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{
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/* fill in config info to be returned to user */
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dev->heads = 2;
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dev->use_2m = 0xff;
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if(boot) {
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dev->sectors = WORD(nsect);
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if(WORD(psect))
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dev->tracks = WORD(psect) / dev->sectors / 2;
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}
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}
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static int config_geom(Stream_t *Stream, struct device *dev,
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struct device *orig_dev, int media,
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struct bootsector *boot)
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{
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if(check_geom(dev, media, boot))
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return 1;
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set_geom(boot,dev);
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return 0;
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}
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static Class_t XdfClass = {
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xdf_read,
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xdf_write,
|
|
xdf_flush,
|
|
xdf_free,
|
|
config_geom,
|
|
0, /* get_data */
|
|
0 /* pre-allocate */
|
|
};
|
|
|
|
Stream_t *XdfOpen(struct device *dev, char *name,
|
|
int mode, char *errmsg, struct xdf_info *info)
|
|
{
|
|
Xdf_t *This;
|
|
off_t begin, end;
|
|
struct bootsector *boot;
|
|
int type;
|
|
|
|
if(dev && (!SHOULD_USE_XDF(dev) || check_geom(dev, 0, 0)))
|
|
return NULL;
|
|
|
|
This = New(Xdf_t);
|
|
if (!This)
|
|
return NULL;
|
|
|
|
This->Class = &XdfClass;
|
|
This->sector_size = 512;
|
|
This->stretch = 0;
|
|
|
|
precmd(dev);
|
|
This->fd = open(name, mode | dev->mode | O_EXCL | O_NDELAY);
|
|
if(This->fd < 0) {
|
|
#ifdef HAVE_SNPRINTF
|
|
snprintf(errmsg,199,"xdf floppy: open: \"%s\"", strerror(errno));
|
|
#else
|
|
sprintf(errmsg,"xdf floppy: open: \"%s\"", strerror(errno));
|
|
#endif
|
|
goto exit_0;
|
|
}
|
|
closeExec(This->fd);
|
|
|
|
This->drive = GET_DRIVE(This->fd);
|
|
if(This->drive < 0)
|
|
goto exit_1;
|
|
|
|
/* allocate buffer */
|
|
This->buffer = (char *) malloc(96 * 512);
|
|
if (!This->buffer)
|
|
goto exit_1;
|
|
|
|
This->current_track = -1;
|
|
This->track_map = (TrackMap_t *)
|
|
calloc(96, sizeof(TrackMap_t));
|
|
if(!This->track_map)
|
|
goto exit_2;
|
|
|
|
/* lock the device on writes */
|
|
if (lock_dev(This->fd, mode == O_RDWR, dev)) {
|
|
#ifdef HAVE_SNPRINTF
|
|
snprintf(errmsg,199,"xdf floppy: device \"%s\" busy:",
|
|
dev->name);
|
|
#else
|
|
sprintf(errmsg,"xdf floppy: device \"%s\" busy:",
|
|
dev->name);
|
|
#endif
|
|
goto exit_3;
|
|
}
|
|
|
|
/* Before reading the boot sector, assume dummy values suitable
|
|
* for reading at least the boot sector */
|
|
This->track_size = 11;
|
|
This->track0_size = 6;
|
|
This->rate = 0;
|
|
This->FatSize = 9;
|
|
This->RootDirSize = 1;
|
|
decompose(This, 0, 512, &begin, &end, 0);
|
|
if (load_data(This, 0, 1, 1) < 0 ) {
|
|
This->rate = 0x43;
|
|
if(load_data(This, 0, 1, 1) < 0)
|
|
goto exit_3;
|
|
}
|
|
|
|
boot = (struct bootsector *) This->buffer;
|
|
This->FatSize = WORD(fatlen);
|
|
This->RootDirSize = WORD(dirents)/16;
|
|
This->track_size = WORD(nsect);
|
|
for(type=0; type < NUMBER(xdf_table); type++) {
|
|
if(xdf_table[type].track_size == This->track_size) {
|
|
This->map = xdf_table[type].map;
|
|
This->track0_size = xdf_table[type].track0_size;
|
|
This->rootskip = xdf_table[type].rootskip;
|
|
break;
|
|
}
|
|
}
|
|
if(type == NUMBER(xdf_table))
|
|
goto exit_3;
|
|
|
|
if(info) {
|
|
info->RootDirSize = This->RootDirSize;
|
|
info->FatSize = This->FatSize;
|
|
info->BadSectors = 5;
|
|
}
|
|
decompose(This, 0, 512, &begin, &end, 1);
|
|
|
|
This->refs = 1;
|
|
This->Next = 0;
|
|
This->Buffer = 0;
|
|
if(dev)
|
|
set_geom(boot, dev);
|
|
return (Stream_t *) This;
|
|
|
|
exit_3:
|
|
Free(This->track_map);
|
|
exit_2:
|
|
Free(This->buffer);
|
|
exit_1:
|
|
close(This->fd);
|
|
exit_0:
|
|
Free(This);
|
|
return NULL;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* Algorithms can't be patented */
|
|
|