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/**
* Not "pure" C - only works with ASCII
*/
/** XXX: check that the data will fit! **/
/** NOTE: should store ec type in qr_data **/
#include <ctype.h>
#include <stdlib.h>
#include <qr/data.h>
#include "qr-bitstream.h"
#include "data-common.h"
static void write_type_and_length(struct qr_data * data,
enum qr_data_type type,
size_t length)
{
(void)qr_bitstream_write(data->bits, QR_TYPE_CODES[type], 4);
(void)qr_bitstream_write(data->bits, length,
get_size_field_length(data->format, type));
}
static struct qr_data * encode_numeric(struct qr_data * data,
const char * input,
size_t length)
{
struct qr_bitstream * stream = data->bits;
size_t bits;
bits = 4 + get_size_field_length(data->format, QR_DATA_NUMERIC)
+ 10 * (length / 3);
if (length % 3 == 1)
bits += 4;
else if (length % 3 == 2)
bits += 7;
stream = data->bits;
if (qr_bitstream_resize(stream,
qr_bitstream_size(stream) + bits) != 0)
return 0;
write_type_and_length(data, QR_DATA_NUMERIC, length);
for (; length >= 3; length -= 3) {
unsigned int x;
if (!isdigit(input[0]) ||
!isdigit(input[1]) ||
!isdigit(input[2]))
return 0;
x = (input[0] - '0') * 100
+ (input[1] - '0') * 10
+ (input[2] - '0');
qr_bitstream_write(stream, x, 10);
input += 3;
}
if (length > 0) {
unsigned int x;
if (!isdigit(*input))
return 0;
x = *input++ - '0';
if (length == 2) {
if (!isdigit(*input))
return 0;
x = x * 10 + (*input - '0');
}
qr_bitstream_write(stream, x, length == 2 ? 7 : 4);
}
return data;
}
static int get_alpha_code(char c)
{
if (isdigit(c))
return c - '0';
else if (isalpha(c))
return toupper(c) - 'A' + 10;
switch (c) {
case ' ': return 36;
case '$': return 37;
case '%': return 38;
case '*': return 39;
case '+': return 40;
case '-': return 41;
case '.': return 42;
case '/': return 43;
case ':': return 44;
default: return -1;
}
}
static struct qr_data * encode_alpha(struct qr_data * data,
const char * input,
size_t length)
{
struct qr_bitstream * stream = data->bits;
size_t bits;
bits = 4 + get_size_field_length(data->format, QR_DATA_ALPHA)
+ 11 * (length / 2)
+ 6 * (length % 2);
stream = data->bits;
if (qr_bitstream_resize(stream,
qr_bitstream_size(stream) + bits) != 0)
return 0;
write_type_and_length(data, QR_DATA_ALPHA, length);
for (; length >= 2; length -= 2) {
unsigned int x;
int c1, c2;
c1 = get_alpha_code(*input++);
c2 = get_alpha_code(*input++);
if (c1 < 0 || c2 < 0)
return 0;
x = c1 * 45 + c2;
qr_bitstream_write(stream, x, 11);
}
if (length > 0) {
int c = get_alpha_code(*input);
if (c < 0)
return 0;
qr_bitstream_write(stream, c, 6);
}
return data;
}
static struct qr_data * encode_8bit(struct qr_data * data,
const char * input,
size_t length)
{
struct qr_bitstream * stream = data->bits;
size_t bits;
bits = 4 + get_size_field_length(data->format, QR_DATA_8BIT)
+ 8 * length;
stream = data->bits;
if (qr_bitstream_resize(stream,
qr_bitstream_size(stream) + bits) != 0)
return 0;
write_type_and_length(data, QR_DATA_8BIT, length);
while (length--)
qr_bitstream_write(stream, *input++, 8);
return data;
}
static struct qr_data * encode_kanji(struct qr_data * data,
const char * input,
size_t length)
{
return 0;
}
struct qr_data * qr_create_data(int format,
enum qr_data_type type,
const char * input,
size_t length)
{
struct qr_data * data;
if (format < 1 || format > 40)
return 0;
data = malloc(sizeof(*data));
if (!data)
return 0;
data->format = format;
data->bits = qr_bitstream_create();
data->offset = 0;
if (data->bits) {
struct qr_data * ret;
switch (type) {
case QR_DATA_NUMERIC:
ret = encode_numeric(data, input, length); break;
case QR_DATA_ALPHA:
ret = encode_alpha(data, input, length); break;
case QR_DATA_8BIT:
ret = encode_8bit(data, input, length); break;
case QR_DATA_KANJI:
ret = encode_kanji(data, input, length); break;
default:
/* unsupported / invalid */
ret = 0;
break;
}
if (!ret) {
qr_bitstream_destroy(data->bits);
free(data);
}
return ret;
} else {
free(data);
return 0;
}
}
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