Class: Quirc::Decoder

Inherits:
Object
  • Object
show all
Defined in:
ext/quirc/quirc.c

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width, height) ⇒ Object 



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# File 'ext/quirc/quirc.c', line 18

static VALUE decoder_m_initialize(VALUE self, VALUE width, VALUE height) {
    struct quirc *qr;

    Data_Get_Struct(self, struct quirc, qr);
    if (quirc_resize(qr, NUM2INT(width), NUM2INT(height)) < 0) {
        rb_raise(rb_const_get(rb_cObject, rb_intern("NoMemoryError")), "Could not allocate memory");
    }
    rb_iv_set(self, "@width", width);
    rb_iv_set(self, "@height", height);

    return Qnil;
}

Instance Attribute Details

#height ⇒ Object (readonly)

#width ⇒ Object (readonly)

Instance Method Details

#decode(image) ⇒ Object 



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# File 'ext/quirc/quirc.c', line 31

static VALUE decoder_m_decode(VALUE self, VALUE image) {
    struct quirc *qr;
    int width, height, size;
    uint8_t *buffer;
    int num_codes;
    VALUE results;

    Check_Type(image, T_STRING);
    Data_Get_Struct(self, struct quirc, qr);

    buffer = quirc_begin(qr, &width, &height);
    size = width * height;
    if (RSTRING_LEN(image) != size) {
        rb_raise(rb_const_get(rb_cObject, rb_intern("ArgumentError")), "Decoder is allocated for %dx%d images", width, height);
    }
    memcpy(buffer, StringValuePtr(image), size);
    quirc_end(qr);

    num_codes = quirc_count(qr);
    results = rb_ary_new2(num_codes);
    for (int i = 0; i < num_codes; i++) {
        struct quirc_code code;
        struct quirc_data data;
        quirc_decode_error_t err;
        VALUE item;

        quirc_extract(qr, i, &code);
        err = quirc_decode(&code, &data);
        if (err) continue;

        item = rb_class_new_instance(0, NULL, cResult);
        rb_iv_set(item, "@version", INT2FIX(data.version));
        rb_iv_set(item, "@ecc_level", INT2FIX(data.ecc_level));
        rb_iv_set(item, "@mask", INT2FIX(data.mask));
        rb_iv_set(item, "@data_type", INT2FIX(data.data_type));
        rb_iv_set(item, "@payload", rb_str_freeze(rb_str_new((const char *) data.payload, data.payload_len)));
        rb_iv_set(item, "@eci", INT2NUM(data.eci));
        rb_ary_push(results, item);
    }

    return results;
}