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Add support for ECI decoding.

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ECI values are decoded and stored in the eci field of struct quirc_data.
Constants of the form QUIRC_ECI_* are defined in quirc.h.
This commit is contained in:
Daniel Beer 2016-09-23 09:50:59 +12:00
parent a8291391ec
commit ab341691c9
3 changed files with 51 additions and 1 deletions
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29
lib/decode.c
View file

@ -802,6 +802,29 @@ static quirc_decode_error_t decode_kanji(struct quirc_data *data,
return QUIRC_SUCCESS;
}
static quirc_decode_error_t decode_eci(struct quirc_data *data,
struct datastream *ds)
{
if (bits_remaining(ds) < 8)
return QUIRC_ERROR_DATA_UNDERFLOW;
data->eci = take_bits(ds, 8);
if ((data->eci & 0xc0) == 0x80) {
if (bits_remaining(ds) < 8)
return QUIRC_ERROR_DATA_UNDERFLOW;
data->eci = (data->eci << 8) | take_bits(ds, 8);
} else if ((data->eci & 0xe0) == 0xc0) {
if (bits_remaining(ds) < 16)
return QUIRC_ERROR_DATA_UNDERFLOW;
data->eci = (data->eci << 16) | take_bits(ds, 16);
}
return QUIRC_SUCCESS;
}
static quirc_decode_error_t decode_payload(struct quirc_data *data,
struct datastream *ds)
{
@ -826,6 +849,10 @@ static quirc_decode_error_t decode_payload(struct quirc_data *data,
err = decode_kanji(data, ds);
break;
case 7:
err = decode_eci(data, ds);
break;
default:
goto done;
}
@ -833,7 +860,7 @@ static quirc_decode_error_t decode_payload(struct quirc_data *data,
if (err)
return err;
if (type > data->data_type)
if (!(type & (type - 1)) && (type > data->data_type))
data->data_type = type;
}
done:

20
lib/quirc.h
View file

@ -89,6 +89,23 @@ const char *quirc_strerror(quirc_decode_error_t err);
#define QUIRC_DATA_TYPE_BYTE 4
#define QUIRC_DATA_TYPE_KANJI 8
/* Common character encodings */
#define QUIRC_ECI_ISO_8859_1 1
#define QUIRC_ECI_IBM437 2
#define QUIRC_ECI_ISO_8859_2 4
#define QUIRC_ECI_ISO_8859_3 5
#define QUIRC_ECI_ISO_8859_4 6
#define QUIRC_ECI_ISO_8859_5 7
#define QUIRC_ECI_ISO_8859_6 8
#define QUIRC_ECI_ISO_8859_7 9
#define QUIRC_ECI_ISO_8859_8 10
#define QUIRC_ECI_ISO_8859_9 11
#define QUIRC_ECI_WINDOWS_874 13
#define QUIRC_ECI_ISO_8859_13 15
#define QUIRC_ECI_ISO_8859_15 17
#define QUIRC_ECI_SHIFT_JIS 20
#define QUIRC_ECI_UTF_8 26
/* This structure is used to return information about detected QR codes
* in the input image.
*/
@ -127,6 +144,9 @@ struct quirc_data {
*/
uint8_t payload[QUIRC_MAX_PAYLOAD];
int payload_len;
/* ECI assignment number */
uint32_t eci;
};
/* Return the number of QR-codes identified in the last processed

3
tests/dbgutil.c
View file

@ -46,6 +46,9 @@ void dump_data(const struct quirc_data *data)
data->data_type, data_type_str(data->data_type));
printf(" Length: %d\n", data->payload_len);
printf(" Payload: %s\n", data->payload);
if (data->eci)
printf(" ECI: %d\n", data->eci);
}
void dump_cells(const struct quirc_code *code)