static int dos33_allocate_sector(int fd) {
int found_track=0,found_sector=0;
unsigned char bitmap[4];
int i,start_track,track_dir,byte;
int result;
dos33_read_vtoc(fd);
/* Originally used to keep things near center of disk for speed */
/* We can use to avoid fragmentation possibly */
start_track=sector_buffer[VTOC_LAST_ALLOC_T]%TRACKS_PER_DISK;
track_dir=sector_buffer[VTOC_ALLOC_DIRECT];
if (track_dir==255) track_dir=-1;
if ((track_dir!=1) && (track_dir!=-1)) {
fprintf(stderr,"ERROR! Invalid track dir %i\n",track_dir);
}
if (((start_track>VTOC_TRACK) && (track_dir!=1)) ||
((start_track<VTOC_TRACK) && (track_dir!=-1))) {
fprintf(stderr,"Warning! Non-optimal values for track dir t=%i d=%i!\n",
start_track,track_dir);
}
i=start_track;
do {
for(byte=1;byte>-1;byte--) {
bitmap[byte]=sector_buffer[VTOC_FREE_BITMAPS+(i*4)+byte];
if (bitmap[byte]!=0x00) {
found_sector=find_first_one(bitmap[byte]);
found_track=i;
/* clear bit indicating in use */
sector_buffer[VTOC_FREE_BITMAPS+(i*4)+byte]&=~(0x1<<found_sector);
found_sector+=(8*(1-byte));
goto found_one;
}
}
/* Move to next track, handling overflows */
i+=track_dir;
if (i<0) {
i=VTOC_TRACK;
track_dir=1;
}
if (i>=TRACKS_PER_DISK) {
i=VTOC_TRACK;
track_dir=-1;
}
} while (i!=start_track);
fprintf(stderr,"No room left!\n");
return -1;
found_one:
/* store new track/direction info */
sector_buffer[VTOC_LAST_ALLOC_T]=found_track;
if (found_track>VTOC_TRACK) sector_buffer[VTOC_ALLOC_DIRECT]=1;
else sector_buffer[VTOC_ALLOC_DIRECT]=-1;
/* Seek to VTOC */
lseek(fd,DISK_OFFSET(VTOC_TRACK,VTOC_SECTOR),SEEK_SET);
/* Write out VTOC */
result=write(fd,§or_buffer,BYTES_PER_SECTOR);
if (result<0) fprintf(stderr,"Error on I/O\n");
return ((found_track<<8)+found_sector);
}
/* returns ?? */
static int dos33_add_file(int fd, char dos_type,
int file_type, int address, int length,
char *filename, char *apple_filename) {
int free_space,file_size,needed_sectors;
struct stat file_info;
int size_in_sectors=0;
int initial_ts_list=0,ts_list=0,i,data_ts,x,bytes_read=0,old_ts_list;
int catalog_track,catalog_sector,sectors_used=0;
int input_fd;
int result;
int first_write=1;
if (apple_filename[0]<64) {
fprintf(stderr,"Error! First char of filename "
"must be ASCII 64 or above!\n");
return ERROR_INVALID_FILENAME;
}
/* Check for comma in filename */
for(i=0;i<strlen(apple_filename);i++) {
if (apple_filename[i]==',') {
fprintf(stderr,"Error! "
"Cannot have , in a filename!\n");
return ERROR_INVALID_FILENAME;
}
}
/* FIXME */
/* check type */
/* and sanity check a/b filesize is set properly */
/* Determine size of file to upload */
if (stat(filename,&file_info)<0) {
fprintf(stderr,"Error! %s not found!\n",filename);
return ERROR_FILE_NOT_FOUND;
}
file_size=(int)file_info.st_size;
if (debug) printf("Filesize: %d\n",file_size);
if (file_type==ADD_BINARY) {
if (debug) printf("Adding 4 bytes for size/offset\n");
if (length==0) length=file_size;
file_size+=4;
}
/* We need to round up to nearest sector size */
/* Add an extra sector for the T/S list */
/* Then add extra sector for a T/S list every 122*256 bytes (~31k) */
needed_sectors=(file_size/BYTES_PER_SECTOR)+ /* round sectors */
((file_size%BYTES_PER_SECTOR)!=0)+/* tail if needed */
1+/* first T/S list */
(file_size/(122*BYTES_PER_SECTOR)); /* extra t/s lists */
/* Get free space on device */
free_space=dos33_free_space(fd);
/* Check for free space */
if (needed_sectors*BYTES_PER_SECTOR>free_space) {
fprintf(stderr,"Error! Not enough free space "
"on disk image (need %d have %d)\n",
needed_sectors*BYTES_PER_SECTOR,free_space);
return ERROR_NO_SPACE;
}
/* plus one because we need a sector for the tail */
size_in_sectors=(file_size/BYTES_PER_SECTOR)+
((file_size%BYTES_PER_SECTOR)!=0);
if (debug) printf("Need to allocate %i data sectors\n",size_in_sectors);
if (debug) printf("Need to allocate %i total sectors\n",needed_sectors);
/* Open the local file */
input_fd=open(filename,O_RDONLY);
if (input_fd<0) {
fprintf(stderr,"Error! could not open %s\n",filename);
return ERROR_IMAGE_NOT_FOUND;
}
i=0;
while (i<size_in_sectors) {
/* Create new T/S list if necessary */
if (i%TSL_MAX_NUMBER==0) {
old_ts_list=ts_list;
/* allocate a sector for the new list */
ts_list=dos33_allocate_sector(fd);
sectors_used++;
if (ts_list<0) return -1;
/* clear the t/s sector */
for(x=0;x<BYTES_PER_SECTOR;x++) {
sector_buffer[x]=0;
}
lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
if (i==0) {
initial_ts_list=ts_list;
}
else {
/* we aren't the first t/s list so do special stuff */
/* load in the old t/s list */
lseek(fd,
DISK_OFFSET(get_high_byte(old_ts_list),
get_low_byte(old_ts_list)),
SEEK_SET);
result=read(fd,§or_buffer,BYTES_PER_SECTOR);
/* point from old ts list to new one we just made */
sector_buffer[TSL_NEXT_TRACK]=get_high_byte(ts_list);
sector_buffer[TSL_NEXT_SECTOR]=get_low_byte(ts_list);
/* set offset into file */
sector_buffer[TSL_OFFSET_H]=get_high_byte((i-122)*256);
sector_buffer[TSL_OFFSET_L]=get_low_byte((i-122)*256);
/* write out the old t/s list with updated info */
lseek(fd,
DISK_OFFSET(get_high_byte(old_ts_list),
get_low_byte(old_ts_list)),
SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
}
}
/* allocate a sector */
data_ts=dos33_allocate_sector(fd);
sectors_used++;
if (data_ts<0) return -1;
/* clear sector */
for(x=0;x<BYTES_PER_SECTOR;x++) sector_buffer[x]=0;
/* read from input */
if ((first_write) && (file_type==ADD_BINARY)) {
first_write=0;
sector_buffer[0]=address&0xff;
sector_buffer[1]=(address>>8)&0xff;
sector_buffer[2]=(length)&0xff;
sector_buffer[3]=((length)>>8)&0xff;
bytes_read=read(input_fd,sector_buffer+4,
BYTES_PER_SECTOR-4);
bytes_read+=4;
}
/* returns entry/track/sector */
static int dos33_check_file_exists(int fd,
char *filename,
int file_deleted) {
int catalog_track,catalog_sector;
int i,file_track;
char file_name[31];
int result;
/* read the VTOC into buffer */
dos33_read_vtoc(fd);
/* get the catalog track and sector from the VTOC */
catalog_track=sector_buffer[VTOC_CATALOG_T];
catalog_sector=sector_buffer[VTOC_CATALOG_S];
repeat_catalog:
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
/* scan all file entries in catalog sector */
for(i=0;i<7;i++) {
file_track=sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)];
/* 0xff means file deleted */
/* 0x0 means empty */
if (file_track!=0x0) {
if (file_track==0xff) {
dos33_filename_to_ascii(file_name,
sector_buffer+(CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE+FILE_NAME)),29);
if (file_deleted) {
/* return if we found the file */
if (!strncmp(filename,file_name,29)) {
return ((i<<16)+(catalog_track<<8)+catalog_sector);
}
}
}
else {
dos33_filename_to_ascii(file_name,
sector_buffer+(CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE+FILE_NAME)),30);
/* return if we found the file */
if (!strncmp(filename,file_name,30)) {
return ((i<<16)+(catalog_track<<8)+catalog_sector);
}
}
}
}
/* point to next catalog track/sector */
catalog_track=sector_buffer[CATALOG_NEXT_T];
catalog_sector=sector_buffer[CATALOG_NEXT_S];
if (catalog_sector!=0) goto repeat_catalog;
if (result<0) fprintf(stderr,"Error on I/O\n");
return -1;
}
static int dos33_dump(int fd) {
int num_tracks,catalog_t,catalog_s,file,ts_t,ts_s,ts_total,track,sector;
int i,j;
int deleted=0;
char temp_string[BUFSIZ];
unsigned char tslist[BYTES_PER_SECTOR];
int result;
/* Read Track 1 Sector 9 */
lseek(fd,DISK_OFFSET(1,9),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
printf("Finding name of startup file, Track 1 Sector 9 offset $75\n");
dump_sector();
printf("Startup Filename: ");
for(i=0;i<30;i++) printf("%c",sector_buffer[0x75+i]&0x7f);
printf("\n");
dos33_read_vtoc(fd);
printf("\nVTOC Sector:\n");
dump_sector();
printf("\n\n");
printf("VTOC INFORMATION:\n");
catalog_t=sector_buffer[VTOC_CATALOG_T];
catalog_s=sector_buffer[VTOC_CATALOG_S];
printf("\tFirst Catalog = %02X/%02X\n",catalog_t,catalog_s);
printf("\tDOS RELEASE = 3.%i\n",sector_buffer[VTOC_DOS_RELEASE]);
printf("\tDISK VOLUME = %i\n",sector_buffer[VTOC_DISK_VOLUME]);
ts_total=sector_buffer[VTOC_MAX_TS_PAIRS];
printf("\tT/S pairs that will fit in T/S List = %i\n",ts_total);
printf("\tLast track where sectors were allocated = $%02X\n",
sector_buffer[VTOC_LAST_ALLOC_T]);
printf("\tDirection of track allocation = %i\n",
sector_buffer[VTOC_ALLOC_DIRECT]);
num_tracks=sector_buffer[VTOC_NUM_TRACKS];
printf("\tNumber of tracks per disk = %i\n",num_tracks);
printf("\tNumber of sectors per track = %i\n",
sector_buffer[VTOC_S_PER_TRACK]);
printf("\tNumber of bytes per sector = %i\n",
(sector_buffer[VTOC_BYTES_PER_SH]<<8)+sector_buffer[VTOC_BYTES_PER_SL]);
printf("\nFree sector bitmap:\n");
printf("\tTrack FEDCBA98 76543210\n");
for(i=0;i<num_tracks;i++) {
printf("\t $%02X: ",i);
for(j=0;j<8;j++) {
if ((sector_buffer[VTOC_FREE_BITMAPS+(i*4)]<<j)&0x80) printf(".");
else printf("U");
}
printf(" ");
for(j=0;j<8;j++) {
if ((sector_buffer[VTOC_FREE_BITMAPS+(i*4)+1]<<j)&0x80) printf(".");
else printf("U");
}
printf("\n");
}
repeat_catalog:
printf("\nCatalog Sector $%02X/$%02x\n",catalog_t,catalog_s);
lseek(fd,DISK_OFFSET(catalog_t,catalog_s),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
dump_sector();
for(file=0;file<7;file++) {
printf("\n\n");
ts_t=sector_buffer[(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_TS_LIST_T))];
ts_s=sector_buffer[(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_TS_LIST_S))];
printf("%i+$%02X/$%02X - ",file,catalog_t,catalog_s);
deleted=0;
if (ts_t==0xff) {
printf("**DELETED** ");
deleted=1;
ts_t=sector_buffer[(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_NAME+0x1e))];
}
if (ts_t==0x00) {
printf("UNUSED!\n");
goto continue_dump;
}
strncpy(temp_string,dos33_filename_to_ascii(temp_string,
sector_buffer+(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_NAME)),30),
BUFSIZ);
for(i=0;i<strlen(temp_string);i++) {
if (temp_string[i]<0x20) printf("^%c",temp_string[i]+0x40);
else printf("%c",temp_string[i]);
}
printf("\n");
printf("\tLocked = %s\n",
sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE)+FILE_TYPE]>0x7f?
"YES":"NO");
printf("\tType = %c\n",
dos33_file_type(sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE)+FILE_TYPE]));
printf("\tSize in sectors = %i\n",
sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_SIZE_L)]+
(sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_SIZE_H)]<<8));
repeat_tsl:
printf("\tT/S List $%02X/$%02X:\n",ts_t,ts_s);
if (deleted) goto continue_dump;
lseek(fd,DISK_OFFSET(ts_t,ts_s),SEEK_SET);
result=read(fd,&tslist,BYTES_PER_SECTOR);
for(i=0;i<ts_total;i++) {
track=tslist[TSL_LIST+(i*TSL_ENTRY_SIZE)];
sector=tslist[TSL_LIST+(i*TSL_ENTRY_SIZE)+1];
if ((track==0) && (sector==0)) printf(".");
else printf("\n\t\t%02X/%02X",track,sector);
}
ts_t=tslist[TSL_NEXT_TRACK];
ts_s=tslist[TSL_NEXT_SECTOR];
if (!((ts_s==0) && (ts_t==0))) goto repeat_tsl;
continue_dump:;
}
catalog_t=sector_buffer[CATALOG_NEXT_T];
catalog_s=sector_buffer[CATALOG_NEXT_S];
if (catalog_s!=0) {
file=0;
goto repeat_catalog;
}
printf("\n");
if (result<0) fprintf(stderr,"Error on I/O\n");
return 0;
}
static int dos33_delete_file(int fd,int fsl) {
int i;
int catalog_track,catalog_sector,catalog_entry;
int ts_track,ts_sector;
char file_type;
int result;
/* unpack file/track/sector info */
catalog_entry=fsl>>16;
catalog_track=(fsl>>8)&0xff;
catalog_sector=(fsl&0xff);
/* Load in the catalog table for the file */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
file_type=sector_buffer[CATALOG_FILE_LIST+
(catalog_entry*CATALOG_ENTRY_SIZE)
+FILE_TYPE];
if (file_type&0x80) {
fprintf(stderr,"File is locked! Unlock before deleting!\n");
exit(1);
}
/* get pointer to t/s list */
ts_track=sector_buffer[CATALOG_FILE_LIST+catalog_entry*CATALOG_ENTRY_SIZE+
FILE_TS_LIST_T];
ts_sector=sector_buffer[CATALOG_FILE_LIST+catalog_entry*CATALOG_ENTRY_SIZE+
FILE_TS_LIST_S];
keep_deleting:
/* load in the t/s list info */
lseek(fd,DISK_OFFSET(ts_track,ts_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
/* Free each sector listed by t/s list */
for(i=0;i<TSL_MAX_NUMBER;i++) {
/* If t/s = 0/0 then no need to clear */
if ((sector_buffer[TSL_LIST+2*i]==0) && (sector_buffer[TSL_LIST+2*i+1]==0)) {
}
else {
dos33_free_sector(fd,sector_buffer[TSL_LIST+2*i],sector_buffer[TSL_LIST+2*i+1]);
}
}
/* free the t/s list */
dos33_free_sector(fd,ts_track,ts_sector);
/* Point to next t/s list */
ts_track=sector_buffer[TSL_NEXT_TRACK];
ts_sector=sector_buffer[TSL_NEXT_SECTOR];
/* If more tsl lists, keep looping */
if ((ts_track==0x0) && (ts_sector==0x0)) {
}
else {
goto keep_deleting;
}
/* Erase file from catalog entry */
/* First reload proper catalog sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
/* save track as last char of name, for undelete purposes */
sector_buffer[CATALOG_FILE_LIST+(catalog_entry*CATALOG_ENTRY_SIZE)+
(FILE_NAME+FILE_NAME_SIZE-1)]=
sector_buffer[CATALOG_FILE_LIST+(catalog_entry*CATALOG_ENTRY_SIZE)];
/* Actually delete the file */
/* by setting the track value to FF which indicates deleted file */
sector_buffer[CATALOG_FILE_LIST+(catalog_entry*CATALOG_ENTRY_SIZE)]=0xff;
/* re seek to catalog position and write out changes */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<0) fprintf(stderr,"Error on I/O\n");
return 0;
}
/* load a file. fts=entry/track/sector */
static int dos33_load_file(int fd,int fts,char *filename) {
int output_fd;
int catalog_file,catalog_track,catalog_sector;
int file_type,file_size=-1,tsl_track,tsl_sector,data_t,data_s;
unsigned char data_sector[BYTES_PER_SECTOR];
int tsl_pointer=0,output_pointer=0;
int result;
/* Fix me! Warn if overwriting file! */
output_fd=open(filename,O_WRONLY|O_CREAT|O_TRUNC,0666);
if (output_fd<0) {
fprintf(stderr,"Error! could not open %s for local save\n",filename);
return -1;
}
catalog_file=fts>>16;
catalog_track=(fts>>8)&0xff;
catalog_sector=(fts&0xff);
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
tsl_track=sector_buffer[CATALOG_FILE_LIST+
(catalog_file*CATALOG_ENTRY_SIZE)+FILE_TS_LIST_T];
tsl_sector=sector_buffer[CATALOG_FILE_LIST+
(catalog_file*CATALOG_ENTRY_SIZE)+FILE_TS_LIST_S];
file_type=dos33_file_type(sector_buffer[CATALOG_FILE_LIST+
(catalog_file*CATALOG_ENTRY_SIZE)
+FILE_TYPE]);
// printf("file_type: %c\n",file_type);
keep_saving:
/* Read in TSL Sector */
lseek(fd,DISK_OFFSET(tsl_track,tsl_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
tsl_pointer=0;
/* check each track/sector pair in the list */
while(tsl_pointer<TSL_MAX_NUMBER) {
/* get the t/s value */
data_t=sector_buffer[TSL_LIST+(tsl_pointer*TSL_ENTRY_SIZE)];
data_s=sector_buffer[TSL_LIST+(tsl_pointer*TSL_ENTRY_SIZE)+1];
if ((data_s==0) && (data_t==0)) {
/* empty */
}
else {
lseek(fd,DISK_OFFSET(data_t,data_s),SEEK_SET);
result=read(fd,&data_sector,BYTES_PER_SECTOR);
/* some file formats have the size in the first sector */
/* so cheat and get real file size from file itself */
if (output_pointer==0) {
switch(file_type) {
case 'A':
case 'I':
file_size=data_sector[0]+(data_sector[1]<<8)+2;
break;
case 'B':
file_size=data_sector[2]+(data_sector[3]<<8)+4;
break;
default:
file_size=-1;
}
}
/* write the block read in out to the output file */
lseek(output_fd,output_pointer*BYTES_PER_SECTOR,SEEK_SET);
result=write(output_fd,&data_sector,BYTES_PER_SECTOR);
}
output_pointer++;
tsl_pointer++;
}
/* finished with TSL sector, see if we have another */
tsl_track=sector_buffer[TSL_NEXT_TRACK];
tsl_sector=sector_buffer[TSL_NEXT_SECTOR];
// printf("Next track/sector=%d/%d op=%d\n",tsl_track,tsl_sector,
// output_pointer*BYTES_PER_SECTOR);
if ((tsl_track==0) && (tsl_sector==0)) {
}
else goto keep_saving;
/* Correct the file size */
if (file_size>=0) {
// printf("Truncating file size to %d\n",file_size);
result=ftruncate(output_fd,file_size);
}
if (result<0) fprintf(stderr,"Error on I/O\n");
return 0;
}
/* returns ?? */
static int dos33_add_file(int fd,char type,char *filename,
char *apple_filename) {
int free_space,file_size,needed_sectors;
struct stat file_info;
int size_in_sectors=0;
int initial_ts_list=0,ts_list=0,i,data_ts,x,bytes_read=0,old_ts_list;
int catalog_track,catalog_sector,sectors_used=0;
int input_fd;
int result;
if (apple_filename[0]<64) {
fprintf(stderr,"Error! First char of filename must be ASCII 64 or above!\n");
exit(3);
}
{
int i;
for(i=0;i<strlen(apple_filename);i++) {
if (apple_filename[i]==',') {
fprintf(stderr,"Error! Cannot have , in a filename!\n");
exit(3);
}
}
}
/* FIXME */
/* check type */
/* and sanity check a/b filesize is set properly */
/* Determine size of file to upload */
if (stat(filename,&file_info)<0) {
fprintf(stderr,"Error! %s not found!\n",filename);
exit(3);
}
file_size=(int)file_info.st_size;
/* We need to round up to nearest sector size */
/* Add an extra sector for the T/S list */
/* Then add extra sector for a T/S list every 122*256 bytes (~31k) */
needed_sectors=(file_size/BYTES_PER_SECTOR)+ /* round sectors */
((file_size%BYTES_PER_SECTOR)!=0)+/* tail if needed */
1+/* first T/S list */
(file_size/(122*BYTES_PER_SECTOR)); /* extra t/s lists */
/* Get free space on device */
free_space=dos33_free_space(fd);
/* Check for free space */
if (needed_sectors*BYTES_PER_SECTOR>free_space) {
fprintf(stderr,"Error! Not enough free space on disk image (need %d have %d)\n",
needed_sectors*BYTES_PER_SECTOR,free_space);
exit(4);
}
/* plus one because we need a sector for the tail */
size_in_sectors=(file_size/BYTES_PER_SECTOR)+
((file_size%BYTES_PER_SECTOR)!=0);
// printf("Need to allocate %i data sectors\n",size_in_sectors);
// printf("Need to allocate %i total sectors\n",needed_sectors);
/* Open the local file */
input_fd=open(filename,O_RDONLY);
if (input_fd<0) {
fprintf(stderr,"Error! could not open %s\n",filename);
return -1;
}
i=0;
while (i<size_in_sectors) {
/* Create new T/S list if necessary */
if (i%TSL_MAX_NUMBER==0) {
old_ts_list=ts_list;
/* allocate a sector for the new list */
ts_list=dos33_allocate_sector(fd);
sectors_used++;
if (ts_list<0) return -1;
/* clear the t/s sector */
for(x=0;x<BYTES_PER_SECTOR;x++) sector_buffer[x]=0;
lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
if (i==0) initial_ts_list=ts_list;
else {
/* we aren't the first t/s list so do special stuff */
/* load in the old t/s list */
lseek(fd,
DISK_OFFSET(get_high_byte(old_ts_list),
get_low_byte(old_ts_list)),
SEEK_SET);
result=read(fd,§or_buffer,BYTES_PER_SECTOR);
/* point from old ts list to new one we just made */
sector_buffer[TSL_NEXT_TRACK]=get_high_byte(ts_list);
sector_buffer[TSL_NEXT_SECTOR]=get_low_byte(ts_list);
/* set offset into file */
sector_buffer[TSL_OFFSET_H]=get_high_byte((i-122)*256);
sector_buffer[TSL_OFFSET_L]=get_low_byte((i-122)*256);
/* write out the old t/s list with updated info */
lseek(fd,
DISK_OFFSET(get_high_byte(old_ts_list),
get_low_byte(old_ts_list)),
SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
}
}
/* allocate a sector */
data_ts=dos33_allocate_sector(fd);
sectors_used++;
if (data_ts<0) return -1;
/* clear sector */
for(x=0;x<BYTES_PER_SECTOR;x++) sector_buffer[x]=0;
/* read from input */
bytes_read=read(input_fd,sector_buffer,BYTES_PER_SECTOR);
if (bytes_read<0) fprintf(stderr,"Error reading bytes!\n");
/* write to disk image */
lseek(fd,DISK_OFFSET((data_ts>>8)&0xff,data_ts&0xff),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
// printf("Writing %i bytes to %i/%i\n",bytes_read,(data_ts>>8)&0xff,
// data_ts&0xff);
/* add to T/s table */
/* read in t/s list */
lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
/* point to new data sector */
sector_buffer[((i%TSL_MAX_NUMBER)*2)+TSL_LIST]=(data_ts>>8)&0xff;
sector_buffer[((i%TSL_MAX_NUMBER)*2)+TSL_LIST+1]=(data_ts&0xff);
/* write t/s list back out */
lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
i++;
}