Implemented use of stdio-pseudo-drives

libisoburn/burn_wrap.c

@@ -1,6 +1,8 @@
 
 /*
-   cc -g -c burn_wrap.c
+   cc -g -c \
+      -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE=1 -D_LARGEFILE64_SOURCE \
+      burn_wrap.c
 */
 /* libburn wrappers for libisoburn 
 
@@ -15,6 +17,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <sys/stat.h>
+#include <fcntl.h>
 
 
 #include "../libburn/libburn.h"
@@ -29,15 +32,13 @@ extern struct isoburn *isoburn_list_start; /* in isoburn.c */
 
 int isoburn_initialize(void)
 {
- int ret;
-
  if(!iso_init())
    return(0);
  if(!burn_initialize())
    return(0);
  isoburn_destroy_all(&isoburn_list_start, 0); /* isoburn_list_start= NULL */
  
- reurn(1);
+ return(1);
 }
 
 
@@ -84,13 +85,10 @@ int isoburn_drive_scan_and_grab(struct burn_drive_info *drive_infos[],
  if(ret==0) {
    if(stat(adr,&stbuf)!=-1) {
      if(S_ISREG(stbuf.st_mode) || S_ISBLK(stbuf.st_mode)) {
-
+       ret= burn_drive_grab_dummy(drive_infos, adr);
-       return(0);
+       if(ret<=0)
-       /* >>> would be acceptable in future */;
+         return(ret);
-
+       o->emulation_mode= 2; /* standard i/o */
-       /* >>> create null-drive */;
-       /* >>> set emulation to standard i/o */;
-
      } else {
 
        /* >>> unsuitable file type */;
@@ -107,7 +105,7 @@ int isoburn_drive_scan_and_grab(struct burn_drive_info *drive_infos[],
    ret= burn_drive_scan_and_grab(drive_infos, adr, load);
    if(ret<=0)
      goto ex;
-   ret= isoburn_examine_media(&o, (*drive_infos)[0].drive, 0);
+   ret= isoburn_welcome_media(&o, (*drive_infos)[0].drive, 0);
    if(ret<=0)
      goto ex;
  }
@@ -128,7 +126,7 @@ int isoburn_drive_grab(struct burn_drive *drive, int load)
  ret= burn_drive_grab(drive, load);
  if(ret<=0)
    goto ex;
- ret= isoburn_examine_media(&o, drive, 0);
+ ret= isoburn_welcome_media(&o, drive, 0);
  if(ret<=0)
    goto ex;
  
@@ -187,16 +185,14 @@ void isoburn_disc_erase(struct burn_drive *drive, int fast)
  ret= isoburn_find_emulator(&o, drive, 0);
  if(ret>0) {
    if(o->emulation_mode==-1) {
-
+     /* To cause a negative reply with burn_drive_wrote_well() */
-     /* >>> influence wrote_well reply or have wrote_well wrapper ? */
+     burn_drive_cancel(drive);
-
      return;
    }
    if(o->emulation_mode>0) {
      ret= isoburn_invalidate_iso(o, 0);
-
+     if(ret<=0)
-     /* >>> influence wrote_well reply or have wrote_well wrapper ? */
+       burn_drive_cancel(drive);
-
      return;
    }
  }
@@ -239,29 +235,103 @@ int isoburn_disc_track_lba_nwa(struct burn_drive *d,
 }
 
 
-int isoburn_disc_write(struct burn_write_opts *opts, struct burn_disc *disc)
+void isoburn_disc_write(struct burn_write_opts *opts, struct burn_disc *disc)
 {
- int ret;
- struct isoburn *o;
- struct burn_drive *drive;
-
- drive= burn_write_opts_get_drive(opts);
- ret= isoburn_find_emulator(&o, drive, 0);
- if(ret<0)
-   return(0);
- if(o->emulation_mode==2) {
-
-   return(0);
-   /* >>> implement an asynchronous standard i/o writer */;
-
- }
  burn_disc_write(opts, disc);
 }
 
 
+#ifdef NIX
+
+int isoburn_random_access_write(struct burn_drive *d, off_t byte_address,
+                                char *data, off_t data_count, int flag)
+{
+ int ret, mode = O_RDWR | O_LARGEFILE | O_CREAT;
+ struct isoburn *o;
+
+ ret= isoburn_find_emulator(&o, d, 0);
+ if(ret<0)
+   return(0);
+ if(o->emulation_mode==2) {
+   if(flag&1)
+     mode|= O_SYNC;
+   o->stdio_fd= open(o->stdio_path, mode);
+   if(o->stdio_fd==-1) {
+
+     /* >>> cannot open stdio_path */;
+     return(0);
+   }
+   if(lseek(o->stdio_fd, byte_address, SEEK_SET)==-1) {
+
+     /* >>> cannot reach given byte_address  */;
+     ret= 0; goto close_stdio;
+   }
+   if(write(o->stdio_fd, data, data_count) != data_count) {
+
+     /* >>> cannot write desired number of bytes */;
+     ret= 0; goto close_stdio;
+   }
+   
+   ret= 1;
+close_stdio:;
+   close(o->stdio_fd); o->stdio_fd= -1;
+ } else if(o->emulation_mode==-1)
+   ret= 0;
+ else
+   ret= burn_random_access_write(d, byte_address, data, data_count, flag);
+ return(ret);
+}
+
+
+int burn_read_data(struct burn_drive *d, off_t byte_address,
+                   char data[], off_t data_size, off_t *data_count, int flag)
+{
+ int ret, mode = O_RDONLY | O_LARGEFILE;
+ off_t count, todo;
+ struct isoburn *o;
+
+ ret= isoburn_find_emulator(&o, d, 0);
+ if(ret<0)
+   return(0);
+ if(o->emulation_mode==2) {
+   o->stdio_fd= open(o->stdio_path, mode);
+   if(o->stdio_fd==-1) {
+
+     /* >>> cannot open stdio_path */;
+     return(0);
+   }
+   if(lseek(o->stdio_fd, byte_address, SEEK_SET)==-1) {
+
+     /* >>> cannot reach given byte_address  */;
+     ret= 0; goto close_stdio;
+   }
+   for(todo= data_size; todo>0; ) {
+     count= read(o->stdio_fd, data+(data_size-todo), todo);
+     if(count<=0)
+   break;
+     todo-= count;
+   }
+   if(todo>0) {
+
+     /* >>> cannot read desired number of bytes */;
+     ret= 0; goto close_stdio;
+   }
+   ret= 1;
+close_stdio:;
+   close(o->stdio_fd); o->stdio_fd= -1;
+ } else if(o->emulation_mode==-1)
+   ret= 0;
+ else
+   ret= burn_read_data(d, byte_address, data, data_size, data_count, flag);
+ return(ret);
+}
+
+#endif /* NIX */
+
+
 void isoburn_drive_release(struct burn_drive *drive, int eject)
 {
- int ret, no_drive_release= 0;
+ int ret;
  struct isoburn *o;
 
  ret= isoburn_find_emulator(&o, drive, 0);

libisoburn/isoburn.c

@@ -17,7 +17,10 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <unistd.h>
 
+#include "../libisofs/libisofs.h"
+#include "../libburn/libburn.h"
 #include "isoburn.h"
 
 
@@ -46,6 +49,12 @@ int isoburn_new(struct isoburn **objpt, int flag)
  o->emulation_mode= 0;
  o->min_start_byte= 0;
  o->nwa= 0;
+
+#ifdef NIX
+ o->stdio_path= NULL;
+ o->stdio_fd= -1;
+#endif /* NIX */
+
  o->target_ropts= NULL;
  o->new_wopts= NULL;
  for(i=0;i<65536;i++)
@@ -84,6 +93,13 @@ int isoburn_destroy(struct isoburn **objpt, int flag)
 
  /* >>> end mutex */
 
+#ifdef NIX
+ if(o->stdio_path!=NULL)
+   free((char *) o->stdio_path);
+ if(o->stdio_fd!=-1)
+   close(o->stdio_fd);
+#endif
+
  if(o->drive!=NULL)
    burn_drive_release(o->drive, 0);
  isoburn_free_rwopts(o);
@@ -120,7 +136,8 @@ int isoburn_get_emulation_mode(struct isoburn *o, int *pt, int flag)
 }
 
 
-int isoburn_get_target_volset(struct isoburn *o, struct volset **pt, int flag)
+int isoburn_get_target_volset(struct isoburn *o, struct iso_volset **pt,
+                              int flag)
 {
  *pt= o->target_volset;
  return(1);
@@ -150,7 +167,7 @@ int isoburn_link(struct isoburn *o, struct isoburn *link, int flag)
  /* >>> mutex */
 
  if(isoburn_list_start==NULL ||
-    isoburn_list_start==link && (flag&1))
+    (isoburn_list_start==link && (flag&1)))
    isoburn_list_start= o;
  if(o->prev!=NULL)
    o->prev->next= o->next;

libisoburn/isoburn.h

@@ -10,8 +10,6 @@
 #define Isoburn_includeD
 
 
-/* <<< as long as no inclusion of libisofs.h */
-struct volset;
 
 /* for uint8_t */
 #include <stdint.h>
@@ -32,7 +30,7 @@ struct isoburn {
 
  /* Although rarely used, libburn can operate on several */
  /* drives simultaneously. */
- /* >>> I propose to design isoburn as chain link of a list with its
+ /* >>> I propose to design isoburn as chain link of a list with its */
  /* >>>  start stored globally. */
  struct isoburn *prev;
  struct isoburn *next;
@@ -46,6 +44,15 @@ struct isoburn {
  /* Aligned start address to be used for processing (counted in blocks) */
  int nwa;
 
+#ifdef NIX
+
+ /* Path for eventual stdandard i/o (see .emulation_mode) */
+ char *stdio_path;
+
+ /* File descriptor for stdandard i/o. Points to stdio_path object if not -1 */
+ int stdio_fd;
+
+#endif /* NIX */
 
  /* --- Vreixo's part --- */
 
@@ -57,7 +64,7 @@ struct isoburn {
  uint8_t target_iso_head[65536];
 
  /* The filesystem structure of the old image from media. */
- struct volset *target_volset;
+ struct iso_volset *target_volset;
 
  /* The output options of the current run of libisofs. */
  /* Element .overwrite eventually points to a buffered new head */
@@ -77,7 +84,8 @@ int isoburn_destroy(struct isoburn **objpt, int flag);
 /* Eventual readers for public attributes */
 /* ( put into separate .h file then ) */
 int isoburn_get_emulation_mode(struct isoburn *o, int *pt, int flag);
-int isoburn_get_target_volset(struct isoburn *o, struct volset **pt, int flag);
+int isoburn_get_target_volset(struct isoburn *o, struct iso_volset **pt,
+                              int flag);
 
 /* List management */
 int isoburn_get_prev(struct isoburn *o, struct isoburn **pt, int flag);