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prodos: add 2MG support

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This commit is contained in:
Vince Weaver 2021-08-01 20:41:54 -04:00
parent 960b705596
commit dbe56330e9
3 changed files with 57 additions and 6 deletions
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53
utils/prodos-utils/prodos.c
View File

@ -12,15 +12,17 @@
#include "prodos.h"
static int ignore_errors=0;
int debug=0;
int debug=1;
/* Read volume directory into a buffer */
static int prodos_read_voldir(int fd, struct voldir_t *voldir, int interleave) {
static int prodos_read_voldir(int fd, struct voldir_t *voldir,
int interleave, int image_offset) {
int result;
unsigned char voldir_buffer[PRODOS_BYTES_PER_BLOCK];
voldir->interleave=interleave;
voldir->image_offset=image_offset;
/* read in VOLDIR KEY Block*/
voldir->fd=fd;
@ -895,6 +897,7 @@ int main(int argc, char **argv) {
unsigned char type='b';
int prodos_fd=0,i;
int interleave=PRODOS_INTERLEAVE_PRODOS,arg_interleave=0;
int image_offset=0;
int command,catalog_entry;
char temp_string[BUFSIZ];
@ -966,17 +969,61 @@ int main(int argc, char **argv) {
/* Try to autodetch interleave based on filename */
if (strlen(image)>4) {
if (!strncmp(&image[strlen(image)-4],".dsk",4)) {
if (debug) printf("Detected DOS33 interleave\n");
interleave=PRODOS_INTERLEAVE_DOS33;
}
/* FIXME: detect this based on magic number */
else if (!strncmp(&image[strlen(image)-4],".2mg",4)) {
char header[64];
int image_format;
read(prodos_fd,header,64);
image_offset=(header[8]|(header[9]<<8));
image_format=header[12];
if (image_format==0) {
interleave=PRODOS_INTERLEAVE_DOS33;
}
else if (image_format==1) {
interleave=PRODOS_INTERLEAVE_PRODOS;
}
else {
fprintf(stderr,"Unsupported 2MG format\n");
return -1;
}
if (debug) {
char string[5];
printf("Detected 2MG format\n");
memcpy(string,header,4);
string[4]=0;
printf("magic: %s\n",string);
memcpy(string,header+4,4);
string[4]=0;
printf("creator: %s\n",string);
printf("Header size: %d\n",image_offset);
printf("Version: %d\n",
(header[10]|(header[11]<<8)));
}
}
}
/* override inteleave if set */
if (arg_interleave) {
interleave=arg_interleave-1;
}
prodos_read_voldir(prodos_fd,&voldir,interleave);
prodos_read_voldir(prodos_fd,&voldir,interleave,image_offset);
/* Move to next argument */
optind++;

1
utils/prodos-utils/prodos.h
View File

@ -30,6 +30,7 @@
struct voldir_t {
int fd;
int interleave;
int image_offset;
unsigned char storage_type;
unsigned char name_length;
unsigned char version;

9
utils/prodos-utils/prodos_read.c
View File

@ -31,7 +31,8 @@ int prodos_read_block(struct voldir_t *voldir,
if (voldir->interleave==PRODOS_INTERLEAVE_PRODOS) {
/* Seek to VOLDIR */
lseek(voldir->fd,blocknum*PRODOS_BYTES_PER_BLOCK,SEEK_SET);
lseek(voldir->fd,voldir->image_offset+
blocknum*PRODOS_BYTES_PER_BLOCK,SEEK_SET);
result=read(voldir->fd,block,PRODOS_BYTES_PER_BLOCK);
if (result<PRODOS_BYTES_PER_BLOCK) {
@ -48,7 +49,8 @@ int prodos_read_block(struct voldir_t *voldir,
blocknum,track,sector1,track,sector2);
if (debug) printf("Seeking to %x\n",((track<<4)+sector1)*256);
lseek(voldir->fd,((track<<4)+sector1)*256,SEEK_SET);
lseek(voldir->fd,voldir->image_offset+
((track<<4)+sector1)*256,SEEK_SET);
result=read(voldir->fd,block,PRODOS_BYTES_PER_BLOCK/2);
if (result<PRODOS_BYTES_PER_BLOCK/2) {
@ -58,7 +60,8 @@ int prodos_read_block(struct voldir_t *voldir,
}
if (debug) printf("Seeking to %x\n",((track<<4)+sector2)*256);
lseek(voldir->fd,((track<<4)+sector2)*256,SEEK_SET);
lseek(voldir->fd,voldir->image_offset+
((track<<4)+sector2)*256,SEEK_SET);
result=read(voldir->fd,block+256,PRODOS_BYTES_PER_BLOCK/2);
if (result<PRODOS_BYTES_PER_BLOCK/2) {