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Improve print_data structure and on-disk format

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Drivers now have an ID number. These will be assigned by me and documented
on the wiki. 0 cannot be used.

Drivers now define a devtype for each device they initialise. This is to
cope with the situation where a driver can support varying devices where
their print data is incompatible (i.e. image scaling is totally changed).
This doesn't apply to any existing supported devices.

Print data no longer includes driver name, and includes driver ID instead.

Paths to saved print data now include driver ID and devtype, and no longer
include driver name.

APIs exposed for converting a print_data into a blob which can then
be loaded back again later. Useful for systems who don't want to use
my simple storage system (which is only aimed at a single user).

File format is now defined and will be documented on the wiki. The header
is larger as we can no longer rely on directory paths in all scenarios.

Print data compat check now checks devtype and driver ID.
This commit is contained in:
Daniel Drake
2007-10-28 22:02:04 +00:00
parent 4e5cfdf92a
commit 294f9ad447
10 changed files with 210 additions and 27 deletions
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28
libfprint/fp_internal.h
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@@ -78,6 +78,7 @@ void fpi_log(enum fpi_log_level, const char *component, const char *function,
struct fp_dev {
struct fp_driver *drv;
usb_dev_handle *udev;
uint32_t devtype;
void *priv;
int nr_enroll_stages;
@@ -104,6 +105,7 @@ enum fp_driver_type {
};
struct fp_driver {
const uint16_t id;
const char *name;
const char *full_name;
const struct usb_id * const id_table;
@@ -152,14 +154,30 @@ struct fp_dscv_dev {
unsigned long driver_data;
};
struct fp_print_data {
const char *driver_name;
size_t length;
unsigned char buffer[0];
enum fp_print_data_type {
PRINT_DATA_RAW = 0, /* memset-imposed default */
PRINT_DATA_NBIS_MINUTIAE,
};
struct fp_print_data {
uint16_t driver_id;
uint32_t devtype;
enum fp_print_data_type type;
size_t length;
unsigned char data[0];
};
struct fpi_print_data_fp1 {
char prefix[3];
uint16_t driver_id;
uint32_t devtype;
unsigned char data_type;
unsigned char data[0];
} __attribute__((__packed__));
struct fp_print_data *fpi_print_data_new(struct fp_dev *dev, size_t length);
int fpi_print_data_compatible(struct fp_dev *dev, struct fp_print_data *data);
gboolean fpi_print_data_compatible(struct fp_print_data *data,
struct fp_dev *dev);
/* bit values for fp_img.flags */
#define FP_IMG_V_FLIPPED (1<<0)