Re: [PATCH] support joliet extension in iso9660 filesystem

[Marco Gerards <mgerards@xs4all.nl>]

Bean <bean123ch@gmail.com> writes:

Hi,

> This patch add joliet extension support for iso9660.

Great!  Hopefully Rockridge still works?

> 2008-02-02  Bean  <bean123ch@gmail.com>
>
> 	* fs/iso9660.c (GRUB_ISO9660_VOLDESC_BOOT): New macro.
> 	(GRUB_ISO9660_VOLDESC_PRIMARY): Likewise.
> 	(GRUB_ISO9660_VOLDESC_SUPP): Likewise.
> 	(GRUB_ISO9660_VOLDESC_PART): Likewise.
> 	(GRUB_ISO9660_VOLDESC_END): Likewise.
> 	(grub_iso9660_primary_voldesc): New member escape.
> 	(grub_iso9660_data): New member joliet.
> 	(grub_iso9660_convert_string): New function.
> 	(grub_iso9660_mount): Detect joliet extension.
> 	(grub_iso9660_iterate_dir): Convert filename when joliet is detected.
> 	(grub_iso9660_iso9660_label): Likewise.
>
> diff --git a/fs/iso9660.c b/fs/iso9660.c
> index 15ce51d..b1562a7 100644
> --- a/fs/iso9660.c
> +++ b/fs/iso9660.c
> @@ -38,6 +38,12 @@
>  #define GRUB_ISO9660_RR_DOT		2
>  #define GRUB_ISO9660_RR_DOTDOT		4
>
> +#define GRUB_ISO9660_VOLDESC_BOOT	0
> +#define GRUB_ISO9660_VOLDESC_PRIMARY	1
> +#define GRUB_ISO9660_VOLDESC_SUPP	2
> +#define GRUB_ISO9660_VOLDESC_PART	3
> +#define GRUB_ISO9660_VOLDESC_END	255
> +
>  /* The head of a volume descriptor.  */
>  struct grub_iso9660_voldesc
>  {
> @@ -67,11 +73,13 @@ struct grub_iso9660_primary_voldesc
>    struct grub_iso9660_voldesc voldesc;
>    grub_uint8_t unused1[33];
>    grub_uint8_t volname[32];
> -  grub_uint8_t unused2[60];
> +  grub_uint8_t unused2[16];
> +  grub_uint8_t escape[32];
> +  grub_uint8_t unused3[12];
>    grub_uint32_t path_table_size;
> -  grub_uint8_t unused3[4];
> +  grub_uint8_t unused4[4];
>    grub_uint32_t path_table;
> -  grub_uint8_t unused4[12];
> +  grub_uint8_t unused5[12];
>    struct grub_iso9660_dir rootdir;
>  } __attribute__ ((packed));
>
> @@ -115,6 +123,7 @@ struct grub_iso9660_data
>    unsigned int length;
>    int rockridge;
>    int susp_skip;
> +  int joliet;
>  };
>
>  struct grub_fshelp_node
> @@ -197,6 +206,23 @@ grub_iso9660_susp_iterate (struct grub_iso9660_data *data,
>    return 0;
>  }
>
> +static grub_uint8_t *
> +grub_iso9660_convert_string (grub_uint16_t *us, int len)
> +{
> +  grub_uint8_t *p;
> +  int i;
> +
> +  p = grub_malloc (len * 4 + 1);
> +  if (! p)
> +    return p;
> +
> +  for (i=0; i<len; i++)
> +    us[i] = grub_be_to_cpu16 (us[i]);
> +
> +  *grub_utf16_to_utf8 (p, us, len) = '\0';
> +
> +  return p;
> +}
>
>  static struct grub_iso9660_data *
>  grub_iso9660_mount (grub_disk_t disk)
> @@ -207,6 +233,8 @@ grub_iso9660_mount (grub_disk_t disk)
>    int sua_size;
>    char *sua;
>    struct grub_iso9660_susp_entry *entry;
> +  struct grub_iso9660_primary_voldesc voldesc;
> +  int sec;

sec?

>    auto grub_err_t susp_iterate (struct grub_iso9660_susp_entry *);
>
> @@ -226,34 +254,51 @@ grub_iso9660_mount (grub_disk_t disk)
>    if (! data)
>      return 0;
>
> +  data->disk = disk;
> +  data->rockridge = 0;
> +  data->joliet = 0;
> +
> +  sec = 16;
> +  do
> +    {
> +      int is_copy = 0;
> +
>    /* Read the superblock.  */
> -  if (grub_disk_read (disk, 16 << GRUB_ISO9660_LOG2_BLKSZ, 0,
> +      if (grub_disk_read (disk, sec << GRUB_ISO9660_LOG2_BLKSZ, 0,
>  		      sizeof (struct grub_iso9660_primary_voldesc),
> -		      (char *) &data->voldesc))
> +                          (char *) &voldesc))
>      {
>        grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
>        goto fail;
>      }
>
> -  if (grub_strncmp ((char *) data->voldesc.voldesc.magic, "CD001", 5) != 0)
> +      if (grub_strncmp ((char *) voldesc.voldesc.magic, "CD001", 5) != 0)

Why did the indentation change for the lines above?

>      {
>        grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
>        goto fail;
>      }
>
> -  data->disk = disk;
> -  data->rockridge = 0;
> -
> -  /* Read the system use area and test it to see if SUSP is
> -     supported.  */
> -  if (grub_disk_read (disk, (grub_le_to_cpu32
> (data->voldesc.rootdir.first_sector)
> -			     << GRUB_ISO9660_LOG2_BLKSZ), 0,
> -		      sizeof (rootdir), (char *) &rootdir))
> +      if (voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_PRIMARY)
> +        is_copy = 1;
> +      else if ((voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_SUPP) &&
> +               (voldesc.escape[0] == 0x25) && (voldesc.escape[1] == 0x2f) &&
> +               ((voldesc.escape[2] == 0x40) ||	/* UCS-2 Level 1.  */
> +                (voldesc.escape[2] == 0x43) ||  /* UCS-2 Level 2.  */
> +                (voldesc.escape[2] == 0x45)))	/* UCS-2 Level 3.  */
>      {
> -      grub_error (GRUB_ERR_BAD_FS, "not a iso9660 filesystem");
> -      goto fail;
> +          is_copy = 1;

is_copy?

> +          data->joliet = 1;
>      }
>
> +      if (is_copy)
> +        grub_memcpy((char *) &data->voldesc, (char *) &voldesc,
> +                    sizeof (struct grub_iso9660_primary_voldesc));
> +
> +      sec++;
> +    } while (voldesc.voldesc.type != GRUB_ISO9660_VOLDESC_END);
> +
> +  /* Read the system use area and test it to see if SUSP is
> +     supported.  */
>    if (grub_disk_read (disk, (grub_le_to_cpu32
> (data->voldesc.rootdir.first_sector)
>  			     << GRUB_ISO9660_LOG2_BLKSZ), 0,
>  		      sizeof (rootdir), (char *) &rootdir))
> @@ -572,6 +617,20 @@ grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
>  	      filename = name;
>  	  }
>  	
> +        if (dir->data->joliet)
> +          {
> +            char *oldname;
> +
> +            oldname = filename;
> +            filename = grub_iso9660_convert_string
> +                  ((grub_uint16_t *) oldname, dirent.namelen >> 1);
> +
> +            if (filename_alloc)
> +              grub_free (oldname);
> +
> +            filename_alloc = 1;
> +          }
> +
>  	if (hook (filename, type, node))
>  	  {
>  	    if (filename_alloc)
> @@ -740,6 +799,10 @@ grub_iso9660_label (grub_device_t device, char **label)
>
>    if (data)
>      {
> +      if (data->joliet)
> +        *label = grub_iso9660_convert_string
> +            ((grub_uint16_t *) &data->voldesc.volname, 16);
> +      else
>        *label = grub_strndup ((char *) data->voldesc.volname, 32);
>        grub_free (data);
>      }
>
>
> -- 
> Bean
>
>
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